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         struct sctp_paramhdr *parmh;
1941         struct mbuf *mret;
1942         uint16_t plen;
1943
1944         switch (ifa->address.sa.sa_family) {
1945 #ifdef INET
1946         case AF_INET:
1947                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1948                 break;
1949 #endif
1950 #ifdef INET6
1951         case AF_INET6:
1952                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1953                 break;
1954 #endif
1955         default:
1956                 return (m);
1957         }
1958         if (M_TRAILINGSPACE(m) >= plen) {
1959                 /* easy side we just drop it on the end */
1960                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1961                 mret = m;
1962         } else {
1963                 /* Need more space */
1964                 mret = m;
1965                 while (SCTP_BUF_NEXT(mret) != NULL) {
1966                         mret = SCTP_BUF_NEXT(mret);
1967                 }
1968                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_DONTWAIT, 1, MT_DATA);
1969                 if (SCTP_BUF_NEXT(mret) == NULL) {
1970                         /* We are hosed, can't add more addresses */
1971                         return (m);
1972                 }
1973                 mret = SCTP_BUF_NEXT(mret);
1974                 parmh = mtod(mret, struct sctp_paramhdr *);
1975         }
1976         /* now add the parameter */
1977         switch (ifa->address.sa.sa_family) {
1978 #ifdef INET
1979         case AF_INET:
1980                 {
1981                         struct sctp_ipv4addr_param *ipv4p;
1982                         struct sockaddr_in *sin;
1983
1984                         sin = (struct sockaddr_in *)&ifa->address.sin;
1985                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1986                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1987                         parmh->param_length = htons(plen);
1988                         ipv4p->addr = sin->sin_addr.s_addr;
1989                         SCTP_BUF_LEN(mret) += plen;
1990                         break;
1991                 }
1992 #endif
1993 #ifdef INET6
1994         case AF_INET6:
1995                 {
1996                         struct sctp_ipv6addr_param *ipv6p;
1997                         struct sockaddr_in6 *sin6;
1998
1999                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2000                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2001                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2002                         parmh->param_length = htons(plen);
2003                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2004                             sizeof(ipv6p->addr));
2005                         /* clear embedded scope in the address */
2006                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2007                         SCTP_BUF_LEN(mret) += plen;
2008                         break;
2009                 }
2010 #endif
2011         default:
2012                 return (m);
2013         }
2014         if (len != NULL) {
2015                 *len += plen;
2016         }
2017         return (mret);
2018 }
2019
2020
2021 struct mbuf *
2022 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2023     struct sctp_scoping *scope,
2024     struct mbuf *m_at, int cnt_inits_to,
2025     uint16_t * padding_len, uint16_t * chunk_len)
2026 {
2027         struct sctp_vrf *vrf = NULL;
2028         int cnt, limit_out = 0, total_count;
2029         uint32_t vrf_id;
2030
2031         vrf_id = inp->def_vrf_id;
2032         SCTP_IPI_ADDR_RLOCK();
2033         vrf = sctp_find_vrf(vrf_id);
2034         if (vrf == NULL) {
2035                 SCTP_IPI_ADDR_RUNLOCK();
2036                 return (m_at);
2037         }
2038         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2039                 struct sctp_ifa *sctp_ifap;
2040                 struct sctp_ifn *sctp_ifnp;
2041
2042                 cnt = cnt_inits_to;
2043                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2044                         limit_out = 1;
2045                         cnt = SCTP_ADDRESS_LIMIT;
2046                         goto skip_count;
2047                 }
2048                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2049                         if ((scope->loopback_scope == 0) &&
2050                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2051                                 /*
2052                                  * Skip loopback devices if loopback_scope
2053                                  * not set
2054                                  */
2055                                 continue;
2056                         }
2057                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2058                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2059                                         continue;
2060                                 }
2061                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2062                                         continue;
2063                                 }
2064                                 cnt++;
2065                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2066                                         break;
2067                                 }
2068                         }
2069                         if (cnt > SCTP_ADDRESS_LIMIT) {
2070                                 break;
2071                         }
2072                 }
2073 skip_count:
2074                 if (cnt > 1) {
2075                         total_count = 0;
2076                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2077                                 cnt = 0;
2078                                 if ((scope->loopback_scope == 0) &&
2079                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2080                                         /*
2081                                          * Skip loopback devices if
2082                                          * loopback_scope not set
2083                                          */
2084                                         continue;
2085                                 }
2086                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2087                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2088                                                 continue;
2089                                         }
2090                                         if (sctp_is_address_in_scope(sctp_ifap,
2091                                             scope, 0) == 0) {
2092                                                 continue;
2093                                         }
2094                                         if ((chunk_len != NULL) &&
2095                                             (padding_len != NULL) &&
2096                                             (*padding_len > 0)) {
2097                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2098                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2099                                                 *chunk_len += *padding_len;
2100                                                 *padding_len = 0;
2101                                         }
2102                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2103                                         if (limit_out) {
2104                                                 cnt++;
2105                                                 total_count++;
2106                                                 if (cnt >= 2) {
2107                                                         /*
2108                                                          * two from each
2109                                                          * address
2110                                                          */
2111                                                         break;
2112                                                 }
2113                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2114                                                         /* No more addresses */
2115                                                         break;
2116                                                 }
2117                                         }
2118                                 }
2119                         }
2120                 }
2121         } else {
2122                 struct sctp_laddr *laddr;
2123
2124                 cnt = cnt_inits_to;
2125                 /* First, how many ? */
2126                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2127                         if (laddr->ifa == NULL) {
2128                                 continue;
2129                         }
2130                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2131                                 /*
2132                                  * Address being deleted by the system, dont
2133                                  * list.
2134                                  */
2135                                 continue;
2136                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2137                                 /*
2138                                  * Address being deleted on this ep don't
2139                                  * list.
2140                                  */
2141                                 continue;
2142                         }
2143                         if (sctp_is_address_in_scope(laddr->ifa,
2144                             scope, 1) == 0) {
2145                                 continue;
2146                         }
2147                         cnt++;
2148                 }
2149                 /*
2150                  * To get through a NAT we only list addresses if we have
2151                  * more than one. That way if you just bind a single address
2152                  * we let the source of the init dictate our address.
2153                  */
2154                 if (cnt > 1) {
2155                         cnt = cnt_inits_to;
2156                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2157                                 if (laddr->ifa == NULL) {
2158                                         continue;
2159                                 }
2160                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2161                                         continue;
2162                                 }
2163                                 if (sctp_is_address_in_scope(laddr->ifa,
2164                                     scope, 0) == 0) {
2165                                         continue;
2166                                 }
2167                                 if ((chunk_len != NULL) &&
2168                                     (padding_len != NULL) &&
2169                                     (*padding_len > 0)) {
2170                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2171                                         SCTP_BUF_LEN(m_at) += *padding_len;
2172                                         *chunk_len += *padding_len;
2173                                         *padding_len = 0;
2174                                 }
2175                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2176                                 cnt++;
2177                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2178                                         break;
2179                                 }
2180                         }
2181                 }
2182         }
2183         SCTP_IPI_ADDR_RUNLOCK();
2184         return (m_at);
2185 }
2186
2187 static struct sctp_ifa *
2188 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2189     uint8_t dest_is_loop,
2190     uint8_t dest_is_priv,
2191     sa_family_t fam)
2192 {
2193         uint8_t dest_is_global = 0;
2194
2195         /* dest_is_priv is true if destination is a private address */
2196         /* dest_is_loop is true if destination is a loopback addresses */
2197
2198         /**
2199          * Here we determine if its a preferred address. A preferred address
2200          * means it is the same scope or higher scope then the destination.
2201          * L = loopback, P = private, G = global
2202          * -----------------------------------------
2203          *    src    |  dest | result
2204          *  ----------------------------------------
2205          *     L     |    L  |    yes
2206          *  -----------------------------------------
2207          *     P     |    L  |    yes-v4 no-v6
2208          *  -----------------------------------------
2209          *     G     |    L  |    yes-v4 no-v6
2210          *  -----------------------------------------
2211          *     L     |    P  |    no
2212          *  -----------------------------------------
2213          *     P     |    P  |    yes
2214          *  -----------------------------------------
2215          *     G     |    P  |    no
2216          *   -----------------------------------------
2217          *     L     |    G  |    no
2218          *   -----------------------------------------
2219          *     P     |    G  |    no
2220          *    -----------------------------------------
2221          *     G     |    G  |    yes
2222          *    -----------------------------------------
2223          */
2224
2225         if (ifa->address.sa.sa_family != fam) {
2226                 /* forget mis-matched family */
2227                 return (NULL);
2228         }
2229         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2230                 dest_is_global = 1;
2231         }
2232         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2233         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2234         /* Ok the address may be ok */
2235 #ifdef INET6
2236         if (fam == AF_INET6) {
2237                 /* ok to use deprecated addresses? no lets not! */
2238                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2239                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2240                         return (NULL);
2241                 }
2242                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2243                         if (dest_is_loop) {
2244                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2245                                 return (NULL);
2246                         }
2247                 }
2248                 if (ifa->src_is_glob) {
2249                         if (dest_is_loop) {
2250                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2251                                 return (NULL);
2252                         }
2253                 }
2254         }
2255 #endif
2256         /*
2257          * Now that we know what is what, implement or table this could in
2258          * theory be done slicker (it used to be), but this is
2259          * straightforward and easier to validate :-)
2260          */
2261         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2262             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2263         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2264             dest_is_loop, dest_is_priv, dest_is_global);
2265
2266         if ((ifa->src_is_loop) && (dest_is_priv)) {
2267                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2268                 return (NULL);
2269         }
2270         if ((ifa->src_is_glob) && (dest_is_priv)) {
2271                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2272                 return (NULL);
2273         }
2274         if ((ifa->src_is_loop) && (dest_is_global)) {
2275                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2276                 return (NULL);
2277         }
2278         if ((ifa->src_is_priv) && (dest_is_global)) {
2279                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2280                 return (NULL);
2281         }
2282         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2283         /* its a preferred address */
2284         return (ifa);
2285 }
2286
2287 static struct sctp_ifa *
2288 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2289     uint8_t dest_is_loop,
2290     uint8_t dest_is_priv,
2291     sa_family_t fam)
2292 {
2293         uint8_t dest_is_global = 0;
2294
2295         /**
2296          * Here we determine if its a acceptable address. A acceptable
2297          * address means it is the same scope or higher scope but we can
2298          * allow for NAT which means its ok to have a global dest and a
2299          * private src.
2300          *
2301          * L = loopback, P = private, G = global
2302          * -----------------------------------------
2303          *  src    |  dest | result
2304          * -----------------------------------------
2305          *   L     |   L   |    yes
2306          *  -----------------------------------------
2307          *   P     |   L   |    yes-v4 no-v6
2308          *  -----------------------------------------
2309          *   G     |   L   |    yes
2310          * -----------------------------------------
2311          *   L     |   P   |    no
2312          * -----------------------------------------
2313          *   P     |   P   |    yes
2314          * -----------------------------------------
2315          *   G     |   P   |    yes - May not work
2316          * -----------------------------------------
2317          *   L     |   G   |    no
2318          * -----------------------------------------
2319          *   P     |   G   |    yes - May not work
2320          * -----------------------------------------
2321          *   G     |   G   |    yes
2322          * -----------------------------------------
2323          */
2324
2325         if (ifa->address.sa.sa_family != fam) {
2326                 /* forget non matching family */
2327                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2328                     ifa->address.sa.sa_family, fam);
2329                 return (NULL);
2330         }
2331         /* Ok the address may be ok */
2332         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2333         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2334             dest_is_loop, dest_is_priv);
2335         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2336                 dest_is_global = 1;
2337         }
2338 #ifdef INET6
2339         if (fam == AF_INET6) {
2340                 /* ok to use deprecated addresses? */
2341                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2342                         return (NULL);
2343                 }
2344                 if (ifa->src_is_priv) {
2345                         /* Special case, linklocal to loop */
2346                         if (dest_is_loop)
2347                                 return (NULL);
2348                 }
2349         }
2350 #endif
2351         /*
2352          * Now that we know what is what, implement our table. This could in
2353          * theory be done slicker (it used to be), but this is
2354          * straightforward and easier to validate :-)
2355          */
2356         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2357             ifa->src_is_loop,
2358             dest_is_priv);
2359         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2360                 return (NULL);
2361         }
2362         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2363             ifa->src_is_loop,
2364             dest_is_global);
2365         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2366                 return (NULL);
2367         }
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2369         /* its an acceptable address */
2370         return (ifa);
2371 }
2372
2373 int
2374 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2375 {
2376         struct sctp_laddr *laddr;
2377
2378         if (stcb == NULL) {
2379                 /* There are no restrictions, no TCB :-) */
2380                 return (0);
2381         }
2382         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2383                 if (laddr->ifa == NULL) {
2384                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2385                             __FUNCTION__);
2386                         continue;
2387                 }
2388                 if (laddr->ifa == ifa) {
2389                         /* Yes it is on the list */
2390                         return (1);
2391                 }
2392         }
2393         return (0);
2394 }
2395
2396
2397 int
2398 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2399 {
2400         struct sctp_laddr *laddr;
2401
2402         if (ifa == NULL)
2403                 return (0);
2404         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2405                 if (laddr->ifa == NULL) {
2406                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2407                             __FUNCTION__);
2408                         continue;
2409                 }
2410                 if ((laddr->ifa == ifa) && laddr->action == 0)
2411                         /* same pointer */
2412                         return (1);
2413         }
2414         return (0);
2415 }
2416
2417
2418
2419 static struct sctp_ifa *
2420 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2421     sctp_route_t * ro,
2422     uint32_t vrf_id,
2423     int non_asoc_addr_ok,
2424     uint8_t dest_is_priv,
2425     uint8_t dest_is_loop,
2426     sa_family_t fam)
2427 {
2428         struct sctp_laddr *laddr, *starting_point;
2429         void *ifn;
2430         int resettotop = 0;
2431         struct sctp_ifn *sctp_ifn;
2432         struct sctp_ifa *sctp_ifa, *sifa;
2433         struct sctp_vrf *vrf;
2434         uint32_t ifn_index;
2435
2436         vrf = sctp_find_vrf(vrf_id);
2437         if (vrf == NULL)
2438                 return (NULL);
2439
2440         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2441         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2442         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2443         /*
2444          * first question, is the ifn we will emit on in our list, if so, we
2445          * want such an address. Note that we first looked for a preferred
2446          * address.
2447          */
2448         if (sctp_ifn) {
2449                 /* is a preferred one on the interface we route out? */
2450                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2451                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2452                             (non_asoc_addr_ok == 0))
2453                                 continue;
2454                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2455                             dest_is_loop,
2456                             dest_is_priv, fam);
2457                         if (sifa == NULL)
2458                                 continue;
2459                         if (sctp_is_addr_in_ep(inp, sifa)) {
2460                                 atomic_add_int(&sifa->refcount, 1);
2461                                 return (sifa);
2462                         }
2463                 }
2464         }
2465         /*
2466          * ok, now we now need to find one on the list of the addresses. We
2467          * can't get one on the emitting interface so let's find first a
2468          * preferred one. If not that an acceptable one otherwise... we
2469          * return NULL.
2470          */
2471         starting_point = inp->next_addr_touse;
2472 once_again:
2473         if (inp->next_addr_touse == NULL) {
2474                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2475                 resettotop = 1;
2476         }
2477         for (laddr = inp->next_addr_touse; laddr;
2478             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2479                 if (laddr->ifa == NULL) {
2480                         /* address has been removed */
2481                         continue;
2482                 }
2483                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2484                         /* address is being deleted */
2485                         continue;
2486                 }
2487                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2488                     dest_is_priv, fam);
2489                 if (sifa == NULL)
2490                         continue;
2491                 atomic_add_int(&sifa->refcount, 1);
2492                 return (sifa);
2493         }
2494         if (resettotop == 0) {
2495                 inp->next_addr_touse = NULL;
2496                 goto once_again;
2497         }
2498         inp->next_addr_touse = starting_point;
2499         resettotop = 0;
2500 once_again_too:
2501         if (inp->next_addr_touse == NULL) {
2502                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2503                 resettotop = 1;
2504         }
2505         /* ok, what about an acceptable address in the inp */
2506         for (laddr = inp->next_addr_touse; laddr;
2507             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2508                 if (laddr->ifa == NULL) {
2509                         /* address has been removed */
2510                         continue;
2511                 }
2512                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2513                         /* address is being deleted */
2514                         continue;
2515                 }
2516                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2517                     dest_is_priv, fam);
2518                 if (sifa == NULL)
2519                         continue;
2520                 atomic_add_int(&sifa->refcount, 1);
2521                 return (sifa);
2522         }
2523         if (resettotop == 0) {
2524                 inp->next_addr_touse = NULL;
2525                 goto once_again_too;
2526         }
2527         /*
2528          * no address bound can be a source for the destination we are in
2529          * trouble
2530          */
2531         return (NULL);
2532 }
2533
2534
2535
2536 static struct sctp_ifa *
2537 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2538     struct sctp_tcb *stcb,
2539     sctp_route_t * ro,
2540     uint32_t vrf_id,
2541     uint8_t dest_is_priv,
2542     uint8_t dest_is_loop,
2543     int non_asoc_addr_ok,
2544     sa_family_t fam)
2545 {
2546         struct sctp_laddr *laddr, *starting_point;
2547         void *ifn;
2548         struct sctp_ifn *sctp_ifn;
2549         struct sctp_ifa *sctp_ifa, *sifa;
2550         uint8_t start_at_beginning = 0;
2551         struct sctp_vrf *vrf;
2552         uint32_t ifn_index;
2553
2554         /*
2555          * first question, is the ifn we will emit on in our list, if so, we
2556          * want that one.
2557          */
2558         vrf = sctp_find_vrf(vrf_id);
2559         if (vrf == NULL)
2560                 return (NULL);
2561
2562         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2563         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2564         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2565
2566         /*
2567          * first question, is the ifn we will emit on in our list?  If so,
2568          * we want that one. First we look for a preferred. Second, we go
2569          * for an acceptable.
2570          */
2571         if (sctp_ifn) {
2572                 /* first try for a preferred address on the ep */
2573                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2574                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2575                                 continue;
2576                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2577                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2578                                 if (sifa == NULL)
2579                                         continue;
2580                                 if (((non_asoc_addr_ok == 0) &&
2581                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2582                                     (non_asoc_addr_ok &&
2583                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2584                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2585                                         /* on the no-no list */
2586                                         continue;
2587                                 }
2588                                 atomic_add_int(&sifa->refcount, 1);
2589                                 return (sifa);
2590                         }
2591                 }
2592                 /* next try for an acceptable address on the ep */
2593                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2594                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2595                                 continue;
2596                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2597                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2598                                 if (sifa == NULL)
2599                                         continue;
2600                                 if (((non_asoc_addr_ok == 0) &&
2601                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2602                                     (non_asoc_addr_ok &&
2603                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2604                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2605                                         /* on the no-no list */
2606                                         continue;
2607                                 }
2608                                 atomic_add_int(&sifa->refcount, 1);
2609                                 return (sifa);
2610                         }
2611                 }
2612
2613         }
2614         /*
2615          * if we can't find one like that then we must look at all addresses
2616          * bound to pick one at first preferable then secondly acceptable.
2617          */
2618         starting_point = stcb->asoc.last_used_address;
2619 sctp_from_the_top:
2620         if (stcb->asoc.last_used_address == NULL) {
2621                 start_at_beginning = 1;
2622                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2623         }
2624         /* search beginning with the last used address */
2625         for (laddr = stcb->asoc.last_used_address; laddr;
2626             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2627                 if (laddr->ifa == NULL) {
2628                         /* address has been removed */
2629                         continue;
2630                 }
2631                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2632                         /* address is being deleted */
2633                         continue;
2634                 }
2635                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2636                 if (sifa == NULL)
2637                         continue;
2638                 if (((non_asoc_addr_ok == 0) &&
2639                     (sctp_is_addr_restricted(stcb, sifa))) ||
2640                     (non_asoc_addr_ok &&
2641                     (sctp_is_addr_restricted(stcb, sifa)) &&
2642                     (!sctp_is_addr_pending(stcb, sifa)))) {
2643                         /* on the no-no list */
2644                         continue;
2645                 }
2646                 stcb->asoc.last_used_address = laddr;
2647                 atomic_add_int(&sifa->refcount, 1);
2648                 return (sifa);
2649         }
2650         if (start_at_beginning == 0) {
2651                 stcb->asoc.last_used_address = NULL;
2652                 goto sctp_from_the_top;
2653         }
2654         /* now try for any higher scope than the destination */
2655         stcb->asoc.last_used_address = starting_point;
2656         start_at_beginning = 0;
2657 sctp_from_the_top2:
2658         if (stcb->asoc.last_used_address == NULL) {
2659                 start_at_beginning = 1;
2660                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2661         }
2662         /* search beginning with the last used address */
2663         for (laddr = stcb->asoc.last_used_address; laddr;
2664             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2665                 if (laddr->ifa == NULL) {
2666                         /* address has been removed */
2667                         continue;
2668                 }
2669                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2670                         /* address is being deleted */
2671                         continue;
2672                 }
2673                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2674                     dest_is_priv, fam);
2675                 if (sifa == NULL)
2676                         continue;
2677                 if (((non_asoc_addr_ok == 0) &&
2678                     (sctp_is_addr_restricted(stcb, sifa))) ||
2679                     (non_asoc_addr_ok &&
2680                     (sctp_is_addr_restricted(stcb, sifa)) &&
2681                     (!sctp_is_addr_pending(stcb, sifa)))) {
2682                         /* on the no-no list */
2683                         continue;
2684                 }
2685                 stcb->asoc.last_used_address = laddr;
2686                 atomic_add_int(&sifa->refcount, 1);
2687                 return (sifa);
2688         }
2689         if (start_at_beginning == 0) {
2690                 stcb->asoc.last_used_address = NULL;
2691                 goto sctp_from_the_top2;
2692         }
2693         return (NULL);
2694 }
2695
2696 static struct sctp_ifa *
2697 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2698     struct sctp_tcb *stcb,
2699     int non_asoc_addr_ok,
2700     uint8_t dest_is_loop,
2701     uint8_t dest_is_priv,
2702     int addr_wanted,
2703     sa_family_t fam,
2704     sctp_route_t * ro
2705 )
2706 {
2707         struct sctp_ifa *ifa, *sifa;
2708         int num_eligible_addr = 0;
2709
2710 #ifdef INET6
2711         struct sockaddr_in6 sin6, lsa6;
2712
2713         if (fam == AF_INET6) {
2714                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2715                 (void)sa6_recoverscope(&sin6);
2716         }
2717 #endif                          /* INET6 */
2718         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2719                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2720                     (non_asoc_addr_ok == 0))
2721                         continue;
2722                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2723                     dest_is_priv, fam);
2724                 if (sifa == NULL)
2725                         continue;
2726 #ifdef INET6
2727                 if (fam == AF_INET6 &&
2728                     dest_is_loop &&
2729                     sifa->src_is_loop && sifa->src_is_priv) {
2730                         /*
2731                          * don't allow fe80::1 to be a src on loop ::1, we
2732                          * don't list it to the peer so we will get an
2733                          * abort.
2734                          */
2735                         continue;
2736                 }
2737                 if (fam == AF_INET6 &&
2738                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2739                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2740                         /*
2741                          * link-local <-> link-local must belong to the same
2742                          * scope.
2743                          */
2744                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2745                         (void)sa6_recoverscope(&lsa6);
2746                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2747                                 continue;
2748                         }
2749                 }
2750 #endif                          /* INET6 */
2751
2752                 /*
2753                  * Check if the IPv6 address matches to next-hop. In the
2754                  * mobile case, old IPv6 address may be not deleted from the
2755                  * interface. Then, the interface has previous and new
2756                  * addresses.  We should use one corresponding to the
2757                  * next-hop.  (by micchie)
2758                  */
2759 #ifdef INET6
2760                 if (stcb && fam == AF_INET6 &&
2761                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2762                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2763                             == 0) {
2764                                 continue;
2765                         }
2766                 }
2767 #endif
2768 #ifdef INET
2769                 /* Avoid topologically incorrect IPv4 address */
2770                 if (stcb && fam == AF_INET &&
2771                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2772                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2773                                 continue;
2774                         }
2775                 }
2776 #endif
2777                 if (stcb) {
2778                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2779                                 continue;
2780                         }
2781                         if (((non_asoc_addr_ok == 0) &&
2782                             (sctp_is_addr_restricted(stcb, sifa))) ||
2783                             (non_asoc_addr_ok &&
2784                             (sctp_is_addr_restricted(stcb, sifa)) &&
2785                             (!sctp_is_addr_pending(stcb, sifa)))) {
2786                                 /*
2787                                  * It is restricted for some reason..
2788                                  * probably not yet added.
2789                                  */
2790                                 continue;
2791                         }
2792                 }
2793                 if (num_eligible_addr >= addr_wanted) {
2794                         return (sifa);
2795                 }
2796                 num_eligible_addr++;
2797         }
2798         return (NULL);
2799 }
2800
2801
2802 static int
2803 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2804     struct sctp_tcb *stcb,
2805     int non_asoc_addr_ok,
2806     uint8_t dest_is_loop,
2807     uint8_t dest_is_priv,
2808     sa_family_t fam)
2809 {
2810         struct sctp_ifa *ifa, *sifa;
2811         int num_eligible_addr = 0;
2812
2813         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2814                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2815                     (non_asoc_addr_ok == 0)) {
2816                         continue;
2817                 }
2818                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2819                     dest_is_priv, fam);
2820                 if (sifa == NULL) {
2821                         continue;
2822                 }
2823                 if (stcb) {
2824                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2825                                 continue;
2826                         }
2827                         if (((non_asoc_addr_ok == 0) &&
2828                             (sctp_is_addr_restricted(stcb, sifa))) ||
2829                             (non_asoc_addr_ok &&
2830                             (sctp_is_addr_restricted(stcb, sifa)) &&
2831                             (!sctp_is_addr_pending(stcb, sifa)))) {
2832                                 /*
2833                                  * It is restricted for some reason..
2834                                  * probably not yet added.
2835                                  */
2836                                 continue;
2837                         }
2838                 }
2839                 num_eligible_addr++;
2840         }
2841         return (num_eligible_addr);
2842 }
2843
2844 static struct sctp_ifa *
2845 sctp_choose_boundall(struct sctp_tcb *stcb,
2846     struct sctp_nets *net,
2847     sctp_route_t * ro,
2848     uint32_t vrf_id,
2849     uint8_t dest_is_priv,
2850     uint8_t dest_is_loop,
2851     int non_asoc_addr_ok,
2852     sa_family_t fam)
2853 {
2854         int cur_addr_num = 0, num_preferred = 0;
2855         void *ifn;
2856         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2857         struct sctp_ifa *sctp_ifa, *sifa;
2858         uint32_t ifn_index;
2859         struct sctp_vrf *vrf;
2860
2861 #ifdef INET
2862         int retried = 0;
2863
2864 #endif
2865
2866         /*-
2867          * For boundall we can use any address in the association.
2868          * If non_asoc_addr_ok is set we can use any address (at least in
2869          * theory). So we look for preferred addresses first. If we find one,
2870          * we use it. Otherwise we next try to get an address on the
2871          * interface, which we should be able to do (unless non_asoc_addr_ok
2872          * is false and we are routed out that way). In these cases where we
2873          * can't use the address of the interface we go through all the
2874          * ifn's looking for an address we can use and fill that in. Punting
2875          * means we send back address 0, which will probably cause problems
2876          * actually since then IP will fill in the address of the route ifn,
2877          * which means we probably already rejected it.. i.e. here comes an
2878          * abort :-<.
2879          */
2880         vrf = sctp_find_vrf(vrf_id);
2881         if (vrf == NULL)
2882                 return (NULL);
2883
2884         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2885         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2886         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2887         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2888         if (sctp_ifn == NULL) {
2889                 /* ?? We don't have this guy ?? */
2890                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2891                 goto bound_all_plan_b;
2892         }
2893         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2894             ifn_index, sctp_ifn->ifn_name);
2895
2896         if (net) {
2897                 cur_addr_num = net->indx_of_eligible_next_to_use;
2898         }
2899         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2900             stcb,
2901             non_asoc_addr_ok,
2902             dest_is_loop,
2903             dest_is_priv, fam);
2904         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2905             num_preferred, sctp_ifn->ifn_name);
2906         if (num_preferred == 0) {
2907                 /*
2908                  * no eligible addresses, we must use some other interface
2909                  * address if we can find one.
2910                  */
2911                 goto bound_all_plan_b;
2912         }
2913         /*
2914          * Ok we have num_eligible_addr set with how many we can use, this
2915          * may vary from call to call due to addresses being deprecated
2916          * etc..
2917          */
2918         if (cur_addr_num >= num_preferred) {
2919                 cur_addr_num = 0;
2920         }
2921         /*
2922          * select the nth address from the list (where cur_addr_num is the
2923          * nth) and 0 is the first one, 1 is the second one etc...
2924          */
2925         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2926
2927         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2928             dest_is_priv, cur_addr_num, fam, ro);
2929
2930         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2931         if (sctp_ifa) {
2932                 atomic_add_int(&sctp_ifa->refcount, 1);
2933                 if (net) {
2934                         /* save off where the next one we will want */
2935                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2936                 }
2937                 return (sctp_ifa);
2938         }
2939         /*
2940          * plan_b: Look at all interfaces and find a preferred address. If
2941          * no preferred fall through to plan_c.
2942          */
2943 bound_all_plan_b:
2944         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2945         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2946                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2947                     sctp_ifn->ifn_name);
2948                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2949                         /* wrong base scope */
2950                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2951                         continue;
2952                 }
2953                 if ((sctp_ifn == looked_at) && looked_at) {
2954                         /* already looked at this guy */
2955                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2956                         continue;
2957                 }
2958                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2959                     dest_is_loop, dest_is_priv, fam);
2960                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2961                     "Found ifn:%p %d preferred source addresses\n",
2962                     ifn, num_preferred);
2963                 if (num_preferred == 0) {
2964                         /* None on this interface. */
2965                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2966                         continue;
2967                 }
2968                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2969                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2970                     num_preferred, (void *)sctp_ifn, cur_addr_num);
2971
2972                 /*
2973                  * Ok we have num_eligible_addr set with how many we can
2974                  * use, this may vary from call to call due to addresses
2975                  * being deprecated etc..
2976                  */
2977                 if (cur_addr_num >= num_preferred) {
2978                         cur_addr_num = 0;
2979                 }
2980                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2981                     dest_is_priv, cur_addr_num, fam, ro);
2982                 if (sifa == NULL)
2983                         continue;
2984                 if (net) {
2985                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2986                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2987                             cur_addr_num);
2988                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2989                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2990                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2991                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2992                 }
2993                 atomic_add_int(&sifa->refcount, 1);
2994                 return (sifa);
2995         }
2996 #ifdef INET
2997 again_with_private_addresses_allowed:
2998 #endif
2999         /* plan_c: do we have an acceptable address on the emit interface */
3000         sifa = NULL;
3001         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3002         if (emit_ifn == NULL) {
3003                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3004                 goto plan_d;
3005         }
3006         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3007                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3008                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3009                     (non_asoc_addr_ok == 0)) {
3010                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3011                         continue;
3012                 }
3013                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3014                     dest_is_priv, fam);
3015                 if (sifa == NULL) {
3016                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3017                         continue;
3018                 }
3019                 if (stcb) {
3020                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3021                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3022                                 sifa = NULL;
3023                                 continue;
3024                         }
3025                         if (((non_asoc_addr_ok == 0) &&
3026                             (sctp_is_addr_restricted(stcb, sifa))) ||
3027                             (non_asoc_addr_ok &&
3028                             (sctp_is_addr_restricted(stcb, sifa)) &&
3029                             (!sctp_is_addr_pending(stcb, sifa)))) {
3030                                 /*
3031                                  * It is restricted for some reason..
3032                                  * probably not yet added.
3033                                  */
3034                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3035                                 sifa = NULL;
3036                                 continue;
3037                         }
3038                 } else {
3039                         SCTP_PRINTF("Stcb is null - no print\n");
3040                 }
3041                 atomic_add_int(&sifa->refcount, 1);
3042                 goto out;
3043         }
3044 plan_d:
3045         /*
3046          * plan_d: We are in trouble. No preferred address on the emit
3047          * interface. And not even a preferred address on all interfaces. Go
3048          * out and see if we can find an acceptable address somewhere
3049          * amongst all interfaces.
3050          */
3051         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3052         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3053                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3054                         /* wrong base scope */
3055                         continue;
3056                 }
3057                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3058                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3059                             (non_asoc_addr_ok == 0))
3060                                 continue;
3061                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3062                             dest_is_loop,
3063                             dest_is_priv, fam);
3064                         if (sifa == NULL)
3065                                 continue;
3066                         if (stcb) {
3067                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3068                                         sifa = NULL;
3069                                         continue;
3070                                 }
3071                                 if (((non_asoc_addr_ok == 0) &&
3072                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3073                                     (non_asoc_addr_ok &&
3074                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3075                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3076                                         /*
3077                                          * It is restricted for some
3078                                          * reason.. probably not yet added.
3079                                          */
3080                                         sifa = NULL;
3081                                         continue;
3082                                 }
3083                         }
3084                         goto out;
3085                 }
3086         }
3087 #ifdef INET
3088         if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3089                 stcb->asoc.scope.ipv4_local_scope = 1;
3090                 retried = 1;
3091                 goto again_with_private_addresses_allowed;
3092         } else if (retried == 1) {
3093                 stcb->asoc.scope.ipv4_local_scope = 0;
3094         }
3095 #endif
3096 out:
3097 #ifdef INET
3098         if (sifa) {
3099                 if (retried == 1) {
3100                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3101                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3102                                         /* wrong base scope */
3103                                         continue;
3104                                 }
3105                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3106                                         struct sctp_ifa *tmp_sifa;
3107
3108                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3109                                             (non_asoc_addr_ok == 0))
3110                                                 continue;
3111                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3112                                             dest_is_loop,
3113                                             dest_is_priv, fam);
3114                                         if (tmp_sifa == NULL) {
3115                                                 continue;
3116                                         }
3117                                         if (tmp_sifa == sifa) {
3118                                                 continue;
3119                                         }
3120                                         if (stcb) {
3121                                                 if (sctp_is_address_in_scope(tmp_sifa,
3122                                                     &stcb->asoc.scope, 0) == 0) {
3123                                                         continue;
3124                                                 }
3125                                                 if (((non_asoc_addr_ok == 0) &&
3126                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3127                                                     (non_asoc_addr_ok &&
3128                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3129                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3130                                                         /*
3131                                                          * It is restricted
3132                                                          * for some reason..
3133                                                          * probably not yet
3134                                                          * added.
3135                                                          */
3136                                                         continue;
3137                                                 }
3138                                         }
3139                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3140                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3141                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3142                                         }
3143                                 }
3144                         }
3145                 }
3146                 atomic_add_int(&sifa->refcount, 1);
3147         }
3148 #endif
3149         return (sifa);
3150 }
3151
3152
3153
3154 /* tcb may be NULL */
3155 struct sctp_ifa *
3156 sctp_source_address_selection(struct sctp_inpcb *inp,
3157     struct sctp_tcb *stcb,
3158     sctp_route_t * ro,
3159     struct sctp_nets *net,
3160     int non_asoc_addr_ok, uint32_t vrf_id)
3161 {
3162         struct sctp_ifa *answer;
3163         uint8_t dest_is_priv, dest_is_loop;
3164         sa_family_t fam;
3165
3166 #ifdef INET
3167         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3168
3169 #endif
3170 #ifdef INET6
3171         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3172
3173 #endif
3174
3175         /**
3176          * Rules: - Find the route if needed, cache if I can. - Look at
3177          * interface address in route, Is it in the bound list. If so we
3178          * have the best source. - If not we must rotate amongst the
3179          * addresses.
3180          *
3181          * Cavets and issues
3182          *
3183          * Do we need to pay attention to scope. We can have a private address
3184          * or a global address we are sourcing or sending to. So if we draw
3185          * it out
3186          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3187          * For V4
3188          * ------------------------------------------
3189          *      source     *      dest  *  result
3190          * -----------------------------------------
3191          * <a>  Private    *    Global  *  NAT
3192          * -----------------------------------------
3193          * <b>  Private    *    Private *  No problem
3194          * -----------------------------------------
3195          * <c>  Global     *    Private *  Huh, How will this work?
3196          * -----------------------------------------
3197          * <d>  Global     *    Global  *  No Problem
3198          *------------------------------------------
3199          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3200          * For V6
3201          *------------------------------------------
3202          *      source     *      dest  *  result
3203          * -----------------------------------------
3204          * <a>  Linklocal  *    Global  *
3205          * -----------------------------------------
3206          * <b>  Linklocal  * Linklocal  *  No problem
3207          * -----------------------------------------
3208          * <c>  Global     * Linklocal  *  Huh, How will this work?
3209          * -----------------------------------------
3210          * <d>  Global     *    Global  *  No Problem
3211          *------------------------------------------
3212          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3213          *
3214          * And then we add to that what happens if there are multiple addresses
3215          * assigned to an interface. Remember the ifa on a ifn is a linked
3216          * list of addresses. So one interface can have more than one IP
3217          * address. What happens if we have both a private and a global
3218          * address? Do we then use context of destination to sort out which
3219          * one is best? And what about NAT's sending P->G may get you a NAT
3220          * translation, or should you select the G thats on the interface in
3221          * preference.
3222          *
3223          * Decisions:
3224          *
3225          * - count the number of addresses on the interface.
3226          * - if it is one, no problem except case <c>.
3227          *   For <a> we will assume a NAT out there.
3228          * - if there are more than one, then we need to worry about scope P
3229          *   or G. We should prefer G -> G and P -> P if possible.
3230          *   Then as a secondary fall back to mixed types G->P being a last
3231          *   ditch one.
3232          * - The above all works for bound all, but bound specific we need to
3233          *   use the same concept but instead only consider the bound
3234          *   addresses. If the bound set is NOT assigned to the interface then
3235          *   we must use rotation amongst the bound addresses..
3236          */
3237         if (ro->ro_rt == NULL) {
3238                 /*
3239                  * Need a route to cache.
3240                  */
3241                 SCTP_RTALLOC(ro, vrf_id);
3242         }
3243         if (ro->ro_rt == NULL) {
3244                 return (NULL);
3245         }
3246         fam = ro->ro_dst.sa_family;
3247         dest_is_priv = dest_is_loop = 0;
3248         /* Setup our scopes for the destination */
3249         switch (fam) {
3250 #ifdef INET
3251         case AF_INET:
3252                 /* Scope based on outbound address */
3253                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3254                         dest_is_loop = 1;
3255                         if (net != NULL) {
3256                                 /* mark it as local */
3257                                 net->addr_is_local = 1;
3258                         }
3259                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3260                         dest_is_priv = 1;
3261                 }
3262                 break;
3263 #endif
3264 #ifdef INET6
3265         case AF_INET6:
3266                 /* Scope based on outbound address */
3267                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3268                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3269                         /*
3270                          * If the address is a loopback address, which
3271                          * consists of "::1" OR "fe80::1%lo0", we are
3272                          * loopback scope. But we don't use dest_is_priv
3273                          * (link local addresses).
3274                          */
3275                         dest_is_loop = 1;
3276                         if (net != NULL) {
3277                                 /* mark it as local */
3278                                 net->addr_is_local = 1;
3279                         }
3280                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3281                         dest_is_priv = 1;
3282                 }
3283                 break;
3284 #endif
3285         }
3286         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3287         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3288         SCTP_IPI_ADDR_RLOCK();
3289         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3290                 /*
3291                  * Bound all case
3292                  */
3293                 answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3294                     dest_is_priv, dest_is_loop,
3295                     non_asoc_addr_ok, fam);
3296                 SCTP_IPI_ADDR_RUNLOCK();
3297                 return (answer);
3298         }
3299         /*
3300          * Subset bound case
3301          */
3302         if (stcb) {
3303                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3304                     vrf_id, dest_is_priv,
3305                     dest_is_loop,
3306                     non_asoc_addr_ok, fam);
3307         } else {
3308                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3309                     non_asoc_addr_ok,
3310                     dest_is_priv,
3311                     dest_is_loop, fam);
3312         }
3313         SCTP_IPI_ADDR_RUNLOCK();
3314         return (answer);
3315 }
3316
3317 static int
3318 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3319 {
3320         struct cmsghdr cmh;
3321         int tlen, at, found;
3322         struct sctp_sndinfo sndinfo;
3323         struct sctp_prinfo prinfo;
3324         struct sctp_authinfo authinfo;
3325
3326         tlen = SCTP_BUF_LEN(control);
3327         at = 0;
3328         found = 0;
3329         /*
3330          * Independent of how many mbufs, find the c_type inside the control
3331          * structure and copy out the data.
3332          */
3333         while (at < tlen) {
3334                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3335                         /* There is not enough room for one more. */
3336                         return (found);
3337                 }
3338                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3339                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3340                         /* We dont't have a complete CMSG header. */
3341                         return (found);
3342                 }
3343                 if (((int)cmh.cmsg_len + at) > tlen) {
3344                         /* We don't have the complete CMSG. */
3345                         return (found);
3346                 }
3347                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3348                     ((c_type == cmh.cmsg_type) ||
3349                     ((c_type == SCTP_SNDRCV) &&
3350                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3351                     (cmh.cmsg_type == SCTP_PRINFO) ||
3352                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3353                         if (c_type == cmh.cmsg_type) {
3354                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3355                                         return (found);
3356                                 }
3357                                 /* It is exactly what we want. Copy it out. */
3358                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3359                                 return (1);
3360                         } else {
3361                                 struct sctp_sndrcvinfo *sndrcvinfo;
3362
3363                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3364                                 if (found == 0) {
3365                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3366                                                 return (found);
3367                                         }
3368                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3369                                 }
3370                                 switch (cmh.cmsg_type) {
3371                                 case SCTP_SNDINFO:
3372                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3373                                                 return (found);
3374                                         }
3375                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3376                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3377                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3378                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3379                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3380                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3381                                         break;
3382                                 case SCTP_PRINFO:
3383                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3384                                                 return (found);
3385                                         }
3386                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3387                                         sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3388                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3389                                         break;
3390                                 case SCTP_AUTHINFO:
3391                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3392                                                 return (found);
3393                                         }
3394                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3395                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3396                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3397                                         break;
3398                                 default:
3399                                         return (found);
3400                                 }
3401                                 found = 1;
3402                         }
3403                 }
3404                 at += CMSG_ALIGN(cmh.cmsg_len);
3405         }
3406         return (found);
3407 }
3408
3409 static int
3410 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3411 {
3412         struct cmsghdr cmh;
3413         int tlen, at;
3414         struct sctp_initmsg initmsg;
3415
3416 #ifdef INET
3417         struct sockaddr_in sin;
3418
3419 #endif
3420 #ifdef INET6
3421         struct sockaddr_in6 sin6;
3422
3423 #endif
3424
3425         tlen = SCTP_BUF_LEN(control);
3426         at = 0;
3427         while (at < tlen) {
3428                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3429                         /* There is not enough room for one more. */
3430                         *error = EINVAL;
3431                         return (1);
3432                 }
3433                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3434                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3435                         /* We dont't have a complete CMSG header. */
3436                         *error = EINVAL;
3437                         return (1);
3438                 }
3439                 if (((int)cmh.cmsg_len + at) > tlen) {
3440                         /* We don't have the complete CMSG. */
3441                         *error = EINVAL;
3442                         return (1);
3443                 }
3444                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3445                         switch (cmh.cmsg_type) {
3446                         case SCTP_INIT:
3447                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3448                                         *error = EINVAL;
3449                                         return (1);
3450                                 }
3451                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3452                                 if (initmsg.sinit_max_attempts)
3453                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3454                                 if (initmsg.sinit_num_ostreams)
3455                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3456                                 if (initmsg.sinit_max_instreams)
3457                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3458                                 if (initmsg.sinit_max_init_timeo)
3459                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3460                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3461                                         struct sctp_stream_out *tmp_str;
3462                                         unsigned int i;
3463
3464                                         /* Default is NOT correct */
3465                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3466                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3467                                         SCTP_TCB_UNLOCK(stcb);
3468                                         SCTP_MALLOC(tmp_str,
3469                                             struct sctp_stream_out *,
3470                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3471                                             SCTP_M_STRMO);
3472                                         SCTP_TCB_LOCK(stcb);
3473                                         if (tmp_str != NULL) {
3474                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3475                                                 stcb->asoc.strmout = tmp_str;
3476                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3477                                         } else {
3478                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3479                                         }
3480                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3481                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3482                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3483                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3484                                                 stcb->asoc.strmout[i].stream_no = i;
3485                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3486                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3487                                         }
3488                                 }
3489                                 break;
3490 #ifdef INET
3491                         case SCTP_DSTADDRV4:
3492                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3493                                         *error = EINVAL;
3494                                         return (1);
3495                                 }
3496                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3497                                 sin.sin_family = AF_INET;
3498                                 sin.sin_len = sizeof(struct sockaddr_in);
3499                                 sin.sin_port = stcb->rport;
3500                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3501                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3502                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3503                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3504                                         *error = EINVAL;
3505                                         return (1);
3506                                 }
3507                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3508                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3509                                         *error = ENOBUFS;
3510                                         return (1);
3511                                 }
3512                                 break;
3513 #endif
3514 #ifdef INET6
3515                         case SCTP_DSTADDRV6:
3516                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3517                                         *error = EINVAL;
3518                                         return (1);
3519                                 }
3520                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3521                                 sin6.sin6_family = AF_INET6;
3522                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3523                                 sin6.sin6_port = stcb->rport;
3524                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3525                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3526                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3527                                         *error = EINVAL;
3528                                         return (1);
3529                                 }
3530 #ifdef INET
3531                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3532                                         in6_sin6_2_sin(&sin, &sin6);
3533                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3534                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3535                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3536                                                 *error = EINVAL;
3537                                                 return (1);
3538                                         }
3539                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3540                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3541                                                 *error = ENOBUFS;
3542                                                 return (1);
3543                                         }
3544                                 } else
3545 #endif
3546                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3547                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3548                                         *error = ENOBUFS;
3549                                         return (1);
3550                                 }
3551                                 break;
3552 #endif
3553                         default:
3554                                 break;
3555                         }
3556                 }
3557                 at += CMSG_ALIGN(cmh.cmsg_len);
3558         }
3559         return (0);
3560 }
3561
3562 static struct sctp_tcb *
3563 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3564     in_port_t port,
3565     struct mbuf *control,
3566     struct sctp_nets **net_p,
3567     int *error)
3568 {
3569         struct cmsghdr cmh;
3570         int tlen, at;
3571         struct sctp_tcb *stcb;
3572         struct sockaddr *addr;
3573
3574 #ifdef INET
3575         struct sockaddr_in sin;
3576
3577 #endif
3578 #ifdef INET6
3579         struct sockaddr_in6 sin6;
3580
3581 #endif
3582
3583         tlen = SCTP_BUF_LEN(control);
3584         at = 0;
3585         while (at < tlen) {
3586                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3587                         /* There is not enough room for one more. */
3588                         *error = EINVAL;
3589                         return (NULL);
3590                 }
3591                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3592                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3593                         /* We dont't have a complete CMSG header. */
3594                         *error = EINVAL;
3595                         return (NULL);
3596                 }
3597                 if (((int)cmh.cmsg_len + at) > tlen) {
3598                         /* We don't have the complete CMSG. */
3599                         *error = EINVAL;
3600                         return (NULL);
3601                 }
3602                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3603                         switch (cmh.cmsg_type) {
3604 #ifdef INET
3605                         case SCTP_DSTADDRV4:
3606                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3607                                         *error = EINVAL;
3608                                         return (NULL);
3609                                 }
3610                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3611                                 sin.sin_family = AF_INET;
3612                                 sin.sin_len = sizeof(struct sockaddr_in);
3613                                 sin.sin_port = port;
3614                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3615                                 addr = (struct sockaddr *)&sin;
3616                                 break;
3617 #endif
3618 #ifdef INET6
3619                         case SCTP_DSTADDRV6:
3620                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3621                                         *error = EINVAL;
3622                                         return (NULL);
3623                                 }
3624                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3625                                 sin6.sin6_family = AF_INET6;
3626                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3627                                 sin6.sin6_port = port;
3628                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3629 #ifdef INET
3630                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3631                                         in6_sin6_2_sin(&sin, &sin6);
3632                                         addr = (struct sockaddr *)&sin;
3633                                 } else
3634 #endif
3635                                         addr = (struct sockaddr *)&sin6;
3636                                 break;
3637 #endif
3638                         default:
3639                                 addr = NULL;
3640                                 break;
3641                         }
3642                         if (addr) {
3643                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3644                                 if (stcb != NULL) {
3645                                         return (stcb);
3646                                 }
3647                         }
3648                 }
3649                 at += CMSG_ALIGN(cmh.cmsg_len);
3650         }
3651         return (NULL);
3652 }
3653
3654 static struct mbuf *
3655 sctp_add_cookie(struct mbuf *init, int init_offset,
3656     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3657 {
3658         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3659         struct sctp_state_cookie *stc;
3660         struct sctp_paramhdr *ph;
3661         uint8_t *foo;
3662         int sig_offset;
3663         uint16_t cookie_sz;
3664
3665         mret = NULL;
3666         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3667             sizeof(struct sctp_paramhdr)), 0,
3668             M_DONTWAIT, 1, MT_DATA);
3669         if (mret == NULL) {
3670                 return (NULL);
3671         }
3672         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3673         if (copy_init == NULL) {
3674                 sctp_m_freem(mret);
3675                 return (NULL);
3676         }
3677 #ifdef SCTP_MBUF_LOGGING
3678         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3679                 struct mbuf *mat;
3680
3681                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3682                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3683                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3684                         }
3685                 }
3686         }
3687 #endif
3688         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3689             M_DONTWAIT);
3690         if (copy_initack == NULL) {
3691                 sctp_m_freem(mret);
3692                 sctp_m_freem(copy_init);
3693                 return (NULL);
3694         }
3695 #ifdef SCTP_MBUF_LOGGING
3696         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3697                 struct mbuf *mat;
3698
3699                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3700                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3701                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3702                         }
3703                 }
3704         }
3705 #endif
3706         /* easy side we just drop it on the end */
3707         ph = mtod(mret, struct sctp_paramhdr *);
3708         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3709             sizeof(struct sctp_paramhdr);
3710         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3711             sizeof(struct sctp_paramhdr));
3712         ph->param_type = htons(SCTP_STATE_COOKIE);
3713         ph->param_length = 0;   /* fill in at the end */
3714         /* Fill in the stc cookie data */
3715         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3716
3717         /* tack the INIT and then the INIT-ACK onto the chain */
3718         cookie_sz = 0;
3719         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3720                 cookie_sz += SCTP_BUF_LEN(m_at);
3721                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3722                         SCTP_BUF_NEXT(m_at) = copy_init;
3723                         break;
3724                 }
3725         }
3726         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3727                 cookie_sz += SCTP_BUF_LEN(m_at);
3728                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3729                         SCTP_BUF_NEXT(m_at) = copy_initack;
3730                         break;
3731                 }
3732         }
3733         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3734                 cookie_sz += SCTP_BUF_LEN(m_at);
3735                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3736                         break;
3737                 }
3738         }
3739         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3740         if (sig == NULL) {
3741                 /* no space, so free the entire chain */
3742                 sctp_m_freem(mret);
3743                 return (NULL);
3744         }
3745         SCTP_BUF_LEN(sig) = 0;
3746         SCTP_BUF_NEXT(m_at) = sig;
3747         sig_offset = 0;
3748         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3749         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3750         *signature = foo;
3751         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3752         cookie_sz += SCTP_SIGNATURE_SIZE;
3753         ph->param_length = htons(cookie_sz);
3754         return (mret);
3755 }
3756
3757
3758 static uint8_t
3759 sctp_get_ect(struct sctp_tcb *stcb)
3760 {
3761         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3762                 return (SCTP_ECT0_BIT);
3763         } else {
3764                 return (0);
3765         }
3766 }
3767
3768 #if defined(INET) || defined(INET6)
3769 static void
3770 sctp_handle_no_route(struct sctp_tcb *stcb,
3771     struct sctp_nets *net,
3772     int so_locked)
3773 {
3774         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3775
3776         if (net) {
3777                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3778                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3779                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3780                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3781                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3782                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3783                                     stcb, 0,
3784                                     (void *)net,
3785                                     so_locked);
3786                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3787                                 net->dest_state &= ~SCTP_ADDR_PF;
3788                         }
3789                 }
3790                 if (stcb) {
3791                         if (net == stcb->asoc.primary_destination) {
3792                                 /* need a new primary */
3793                                 struct sctp_nets *alt;
3794
3795                                 alt = sctp_find_alternate_net(stcb, net, 0);
3796                                 if (alt != net) {
3797                                         if (stcb->asoc.alternate) {
3798                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3799                                         }
3800                                         stcb->asoc.alternate = alt;
3801                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3802                                         if (net->ro._s_addr) {
3803                                                 sctp_free_ifa(net->ro._s_addr);
3804                                                 net->ro._s_addr = NULL;
3805                                         }
3806                                         net->src_addr_selected = 0;
3807                                 }
3808                         }
3809                 }
3810         }
3811 }
3812
3813 #endif
3814
3815 static int
3816 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3817     struct sctp_tcb *stcb,      /* may be NULL */
3818     struct sctp_nets *net,
3819     struct sockaddr *to,
3820     struct mbuf *m,
3821     uint32_t auth_offset,
3822     struct sctp_auth_chunk *auth,
3823     uint16_t auth_keyid,
3824     int nofragment_flag,
3825     int ecn_ok,
3826     int out_of_asoc_ok,
3827     uint16_t src_port,
3828     uint16_t dest_port,
3829     uint32_t v_tag,
3830     uint16_t port,
3831     union sctp_sockstore *over_addr,
3832     uint8_t use_mflowid, uint32_t mflowid,
3833 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3834     int so_locked SCTP_UNUSED
3835 #else
3836     int so_locked
3837 #endif
3838 )
3839 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3840 {
3841         /**
3842          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3843          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3844          * - fill in the HMAC digest of any AUTH chunk in the packet.
3845          * - calculate and fill in the SCTP checksum.
3846          * - prepend an IP address header.
3847          * - if boundall use INADDR_ANY.
3848          * - if boundspecific do source address selection.
3849          * - set fragmentation option for ipV4.
3850          * - On return from IP output, check/adjust mtu size of output
3851          *   interface and smallest_mtu size as well.
3852          */
3853         /* Will need ifdefs around this */
3854         struct mbuf *newm;
3855         struct sctphdr *sctphdr;
3856         int packet_length;
3857         int ret;
3858         uint32_t vrf_id;
3859
3860 #if defined(INET) || defined(INET6)
3861         struct mbuf *o_pak;
3862         sctp_route_t *ro = NULL;
3863         struct udphdr *udp = NULL;
3864
3865 #endif
3866         uint8_t tos_value;
3867
3868 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3869         struct socket *so = NULL;
3870
3871 #endif
3872
3873         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3874                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3875                 sctp_m_freem(m);
3876                 return (EFAULT);
3877         }
3878         if (stcb) {
3879                 vrf_id = stcb->asoc.vrf_id;
3880         } else {
3881                 vrf_id = inp->def_vrf_id;
3882         }
3883
3884         /* fill in the HMAC digest for any AUTH chunk in the packet */
3885         if ((auth != NULL) && (stcb != NULL)) {
3886                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3887         }
3888         if (net) {
3889                 tos_value = net->dscp;
3890         } else if (stcb) {
3891                 tos_value = stcb->asoc.default_dscp;
3892         } else {
3893                 tos_value = inp->sctp_ep.default_dscp;
3894         }
3895
3896         switch (to->sa_family) {
3897 #ifdef INET
3898         case AF_INET:
3899                 {
3900                         struct ip *ip = NULL;
3901                         sctp_route_t iproute;
3902                         int len;
3903
3904                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3905                         if (port) {
3906                                 len += sizeof(struct udphdr);
3907                         }
3908                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3909                         if (newm == NULL) {
3910                                 sctp_m_freem(m);
3911                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3912                                 return (ENOMEM);
3913                         }
3914                         SCTP_ALIGN_TO_END(newm, len);
3915                         SCTP_BUF_LEN(newm) = len;
3916                         SCTP_BUF_NEXT(newm) = m;
3917                         m = newm;
3918                         if (net != NULL) {
3919 #ifdef INVARIANTS
3920                                 if (net->flowidset == 0) {
3921                                         panic("Flow ID not set");
3922                                 }
3923 #endif
3924                                 m->m_pkthdr.flowid = net->flowid;
3925                                 m->m_flags |= M_FLOWID;
3926                         } else {
3927                                 if (use_mflowid != 0) {
3928                                         m->m_pkthdr.flowid = mflowid;
3929                                         m->m_flags |= M_FLOWID;
3930                                 }
3931                         }
3932                         packet_length = sctp_calculate_len(m);
3933                         ip = mtod(m, struct ip *);
3934                         ip->ip_v = IPVERSION;
3935                         ip->ip_hl = (sizeof(struct ip) >> 2);
3936                         if (tos_value == 0) {
3937                                 /*
3938                                  * This means especially, that it is not set
3939                                  * at the SCTP layer. So use the value from
3940                                  * the IP layer.
3941                                  */
3942                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3943                         }
3944                         tos_value &= 0xfc;
3945                         if (ecn_ok) {
3946                                 tos_value |= sctp_get_ect(stcb);
3947                         }
3948                         if ((nofragment_flag) && (port == 0)) {
3949                                 ip->ip_off = IP_DF;
3950                         } else {
3951                                 ip->ip_off = 0;
3952                         }
3953                         /* FreeBSD has a function for ip_id's */
3954                         ip->ip_id = ip_newid();
3955
3956                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3957                         ip->ip_len = packet_length;
3958                         ip->ip_tos = tos_value;
3959                         if (port) {
3960                                 ip->ip_p = IPPROTO_UDP;
3961                         } else {
3962                                 ip->ip_p = IPPROTO_SCTP;
3963                         }
3964                         ip->ip_sum = 0;
3965                         if (net == NULL) {
3966                                 ro = &iproute;
3967                                 memset(&iproute, 0, sizeof(iproute));
3968                                 memcpy(&ro->ro_dst, to, to->sa_len);
3969                         } else {
3970                                 ro = (sctp_route_t *) & net->ro;
3971                         }
3972                         /* Now the address selection part */
3973                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3974
3975                         /* call the routine to select the src address */
3976                         if (net && out_of_asoc_ok == 0) {
3977                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3978                                         sctp_free_ifa(net->ro._s_addr);
3979                                         net->ro._s_addr = NULL;
3980                                         net->src_addr_selected = 0;
3981                                         if (ro->ro_rt) {
3982                                                 RTFREE(ro->ro_rt);
3983                                                 ro->ro_rt = NULL;
3984                                         }
3985                                 }
3986                                 if (net->src_addr_selected == 0) {
3987                                         /* Cache the source address */
3988                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3989                                             ro, net, 0,
3990                                             vrf_id);
3991                                         net->src_addr_selected = 1;
3992                                 }
3993                                 if (net->ro._s_addr == NULL) {
3994                                         /* No route to host */
3995                                         net->src_addr_selected = 0;
3996                                         sctp_handle_no_route(stcb, net, so_locked);
3997                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3998                                         sctp_m_freem(m);
3999                                         return (EHOSTUNREACH);
4000                                 }
4001                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4002                         } else {
4003                                 if (over_addr == NULL) {
4004                                         struct sctp_ifa *_lsrc;
4005
4006                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4007                                             net,
4008                                             out_of_asoc_ok,
4009                                             vrf_id);
4010                                         if (_lsrc == NULL) {
4011                                                 sctp_handle_no_route(stcb, net, so_locked);
4012                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4013                                                 sctp_m_freem(m);
4014                                                 return (EHOSTUNREACH);
4015                                         }
4016                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4017                                         sctp_free_ifa(_lsrc);
4018                                 } else {
4019                                         ip->ip_src = over_addr->sin.sin_addr;
4020                                         SCTP_RTALLOC(ro, vrf_id);
4021                                 }
4022                         }
4023                         if (port) {
4024                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4025                                         sctp_handle_no_route(stcb, net, so_locked);
4026                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4027                                         sctp_m_freem(m);
4028                                         return (EHOSTUNREACH);
4029                                 }
4030                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4031                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4032                                 udp->uh_dport = port;
4033                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4034                                 if (V_udp_cksum) {
4035                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4036                                 } else {
4037                                         udp->uh_sum = 0;
4038                                 }
4039                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4040                         } else {
4041                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4042                         }
4043
4044                         sctphdr->src_port = src_port;
4045                         sctphdr->dest_port = dest_port;
4046                         sctphdr->v_tag = v_tag;
4047                         sctphdr->checksum = 0;
4048
4049                         /*
4050                          * If source address selection fails and we find no
4051                          * route then the ip_output should fail as well with
4052                          * a NO_ROUTE_TO_HOST type error. We probably should
4053                          * catch that somewhere and abort the association
4054                          * right away (assuming this is an INIT being sent).
4055                          */
4056                         if (ro->ro_rt == NULL) {
4057                                 /*
4058                                  * src addr selection failed to find a route
4059                                  * (or valid source addr), so we can't get
4060                                  * there from here (yet)!
4061                                  */
4062                                 sctp_handle_no_route(stcb, net, so_locked);
4063                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4064                                 sctp_m_freem(m);
4065                                 return (EHOSTUNREACH);
4066                         }
4067                         if (ro != &iproute) {
4068                                 memcpy(&iproute, ro, sizeof(*ro));
4069                         }
4070                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4071                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4072                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4073                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4074                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4075                             (void *)ro->ro_rt);
4076
4077                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4078                                 /* failed to prepend data, give up */
4079                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4080                                 sctp_m_freem(m);
4081                                 return (ENOMEM);
4082                         }
4083                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4084                         if (port) {
4085 #if defined(SCTP_WITH_NO_CSUM)
4086                                 SCTP_STAT_INCR(sctps_sendnocrc);
4087 #else
4088                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4089                                 SCTP_STAT_INCR(sctps_sendswcrc);
4090 #endif
4091                                 if (V_udp_cksum) {
4092                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4093                                 }
4094                         } else {
4095 #if defined(SCTP_WITH_NO_CSUM)
4096                                 SCTP_STAT_INCR(sctps_sendnocrc);
4097 #else
4098                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4099                                 m->m_pkthdr.csum_data = 0;
4100                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4101 #endif
4102                         }
4103 #ifdef SCTP_PACKET_LOGGING
4104                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4105                                 sctp_packet_log(o_pak);
4106 #endif
4107                         /* send it out.  table id is taken from stcb */
4108 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4109                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4110                                 so = SCTP_INP_SO(inp);
4111                                 SCTP_SOCKET_UNLOCK(so, 0);
4112                         }
4113 #endif
4114                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4115 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4116                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4117                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4118                                 SCTP_TCB_UNLOCK(stcb);
4119                                 SCTP_SOCKET_LOCK(so, 0);
4120                                 SCTP_TCB_LOCK(stcb);
4121                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4122                         }
4123 #endif
4124                         SCTP_STAT_INCR(sctps_sendpackets);
4125                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4126                         if (ret)
4127                                 SCTP_STAT_INCR(sctps_senderrors);
4128
4129                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4130                         if (net == NULL) {
4131                                 /* free tempy routes */
4132                                 RO_RTFREE(ro);
4133                         } else {
4134                                 /*
4135                                  * PMTU check versus smallest asoc MTU goes
4136                                  * here
4137                                  */
4138                                 if ((ro->ro_rt != NULL) &&
4139                                     (net->ro._s_addr)) {
4140                                         uint32_t mtu;
4141
4142                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4143                                         if (net->port) {
4144                                                 mtu -= sizeof(struct udphdr);
4145                                         }
4146                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4147                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4148                                                 net->mtu = mtu;
4149                                         }
4150                                 } else if (ro->ro_rt == NULL) {
4151                                         /* route was freed */
4152                                         if (net->ro._s_addr &&
4153                                             net->src_addr_selected) {
4154                                                 sctp_free_ifa(net->ro._s_addr);
4155                                                 net->ro._s_addr = NULL;
4156                                         }
4157                                         net->src_addr_selected = 0;
4158                                 }
4159                         }
4160                         return (ret);
4161                 }
4162 #endif
4163 #ifdef INET6
4164         case AF_INET6:
4165                 {
4166                         uint32_t flowlabel, flowinfo;
4167                         struct ip6_hdr *ip6h;
4168                         struct route_in6 ip6route;
4169                         struct ifnet *ifp;
4170                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4171                         int prev_scope = 0;
4172                         struct sockaddr_in6 lsa6_storage;
4173                         int error;
4174                         u_short prev_port = 0;
4175                         int len;
4176
4177                         if (net) {
4178                                 flowlabel = net->flowlabel;
4179                         } else if (stcb) {
4180                                 flowlabel = stcb->asoc.default_flowlabel;
4181                         } else {
4182                                 flowlabel = inp->sctp_ep.default_flowlabel;
4183                         }
4184                         if (flowlabel == 0) {
4185                                 /*
4186                                  * This means especially, that it is not set
4187                                  * at the SCTP layer. So use the value from
4188                                  * the IP layer.
4189                                  */
4190                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4191                         }
4192                         flowlabel &= 0x000fffff;
4193                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4194                         if (port) {
4195                                 len += sizeof(struct udphdr);
4196                         }
4197                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4198                         if (newm == NULL) {
4199                                 sctp_m_freem(m);
4200                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4201                                 return (ENOMEM);
4202                         }
4203                         SCTP_ALIGN_TO_END(newm, len);
4204                         SCTP_BUF_LEN(newm) = len;
4205                         SCTP_BUF_NEXT(newm) = m;
4206                         m = newm;
4207                         if (net != NULL) {
4208 #ifdef INVARIANTS
4209                                 if (net->flowidset == 0) {
4210                                         panic("Flow ID not set");
4211                                 }
4212 #endif
4213                                 m->m_pkthdr.flowid = net->flowid;
4214                                 m->m_flags |= M_FLOWID;
4215                         } else {
4216                                 if (use_mflowid != 0) {
4217                                         m->m_pkthdr.flowid = mflowid;
4218                                         m->m_flags |= M_FLOWID;
4219                                 }
4220                         }
4221                         packet_length = sctp_calculate_len(m);
4222
4223                         ip6h = mtod(m, struct ip6_hdr *);
4224                         /* protect *sin6 from overwrite */
4225                         sin6 = (struct sockaddr_in6 *)to;
4226                         tmp = *sin6;
4227                         sin6 = &tmp;
4228
4229                         /* KAME hack: embed scopeid */
4230                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4231                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4232                                 return (EINVAL);
4233                         }
4234                         if (net == NULL) {
4235                                 memset(&ip6route, 0, sizeof(ip6route));
4236                                 ro = (sctp_route_t *) & ip6route;
4237                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4238                         } else {
4239                                 ro = (sctp_route_t *) & net->ro;
4240                         }
4241                         /*
4242                          * We assume here that inp_flow is in host byte
4243                          * order within the TCB!
4244                          */
4245                         if (tos_value == 0) {
4246                                 /*
4247                                  * This means especially, that it is not set
4248                                  * at the SCTP layer. So use the value from
4249                                  * the IP layer.
4250                                  */
4251                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4252                         }
4253                         tos_value &= 0xfc;
4254                         if (ecn_ok) {
4255                                 tos_value |= sctp_get_ect(stcb);
4256                         }
4257                         flowinfo = 0x06;
4258                         flowinfo <<= 8;
4259                         flowinfo |= tos_value;
4260                         flowinfo <<= 20;
4261                         flowinfo |= flowlabel;
4262                         ip6h->ip6_flow = htonl(flowinfo);
4263                         if (port) {
4264                                 ip6h->ip6_nxt = IPPROTO_UDP;
4265                         } else {
4266                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4267                         }
4268                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4269                         ip6h->ip6_dst = sin6->sin6_addr;
4270
4271                         /*
4272                          * Add SRC address selection here: we can only reuse
4273                          * to a limited degree the kame src-addr-sel, since
4274                          * we can try their selection but it may not be
4275                          * bound.
4276                          */
4277                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4278                         lsa6_tmp.sin6_family = AF_INET6;
4279                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4280                         lsa6 = &lsa6_tmp;
4281                         if (net && out_of_asoc_ok == 0) {
4282                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4283                                         sctp_free_ifa(net->ro._s_addr);
4284                                         net->ro._s_addr = NULL;
4285                                         net->src_addr_selected = 0;
4286                                         if (ro->ro_rt) {
4287                                                 RTFREE(ro->ro_rt);
4288                                                 ro->ro_rt = NULL;
4289                                         }
4290                                 }
4291                                 if (net->src_addr_selected == 0) {
4292                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4293                                         /* KAME hack: embed scopeid */
4294                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4295                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4296                                                 return (EINVAL);
4297                                         }
4298                                         /* Cache the source address */
4299                                         net->ro._s_addr = sctp_source_address_selection(inp,
4300                                             stcb,
4301                                             ro,
4302                                             net,
4303                                             0,
4304                                             vrf_id);
4305                                         (void)sa6_recoverscope(sin6);
4306                                         net->src_addr_selected = 1;
4307                                 }
4308                                 if (net->ro._s_addr == NULL) {
4309                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4310                                         net->src_addr_selected = 0;
4311                                         sctp_handle_no_route(stcb, net, so_locked);
4312                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4313                                         sctp_m_freem(m);
4314                                         return (EHOSTUNREACH);
4315                                 }
4316                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4317                         } else {
4318                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4319                                 /* KAME hack: embed scopeid */
4320                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4321                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4322                                         return (EINVAL);
4323                                 }
4324                                 if (over_addr == NULL) {
4325                                         struct sctp_ifa *_lsrc;
4326
4327                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4328                                             net,
4329                                             out_of_asoc_ok,
4330                                             vrf_id);
4331                                         if (_lsrc == NULL) {
4332                                                 sctp_handle_no_route(stcb, net, so_locked);
4333                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4334                                                 sctp_m_freem(m);
4335                                                 return (EHOSTUNREACH);
4336                                         }
4337                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4338                                         sctp_free_ifa(_lsrc);
4339                                 } else {
4340                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4341                                         SCTP_RTALLOC(ro, vrf_id);
4342                                 }
4343                                 (void)sa6_recoverscope(sin6);
4344                         }
4345                         lsa6->sin6_port = inp->sctp_lport;
4346
4347                         if (ro->ro_rt == NULL) {
4348                                 /*
4349                                  * src addr selection failed to find a route
4350                                  * (or valid source addr), so we can't get
4351                                  * there from here!
4352                                  */
4353                                 sctp_handle_no_route(stcb, net, so_locked);
4354                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4355                                 sctp_m_freem(m);
4356                                 return (EHOSTUNREACH);
4357                         }
4358                         /*
4359                          * XXX: sa6 may not have a valid sin6_scope_id in
4360                          * the non-SCOPEDROUTING case.
4361                          */
4362                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4363                         lsa6_storage.sin6_family = AF_INET6;
4364                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4365                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4366                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4367                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4368                                 sctp_m_freem(m);
4369                                 return (error);
4370                         }
4371                         /* XXX */
4372                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4373                         lsa6_storage.sin6_port = inp->sctp_lport;
4374                         lsa6 = &lsa6_storage;
4375                         ip6h->ip6_src = lsa6->sin6_addr;
4376
4377                         if (port) {
4378                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4379                                         sctp_handle_no_route(stcb, net, so_locked);
4380                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4381                                         sctp_m_freem(m);
4382                                         return (EHOSTUNREACH);
4383                                 }
4384                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4385                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4386                                 udp->uh_dport = port;
4387                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4388                                 udp->uh_sum = 0;
4389                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4390                         } else {
4391                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4392                         }
4393
4394                         sctphdr->src_port = src_port;
4395                         sctphdr->dest_port = dest_port;
4396                         sctphdr->v_tag = v_tag;
4397                         sctphdr->checksum = 0;
4398
4399                         /*
4400                          * We set the hop limit now since there is a good
4401                          * chance that our ro pointer is now filled
4402                          */
4403                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4404                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4405
4406 #ifdef SCTP_DEBUG
4407                         /* Copy to be sure something bad is not happening */
4408                         sin6->sin6_addr = ip6h->ip6_dst;
4409                         lsa6->sin6_addr = ip6h->ip6_src;
4410 #endif
4411
4412                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4413                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4414                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4415                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4416                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4417                         if (net) {
4418                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4419                                 /*
4420                                  * preserve the port and scope for link
4421                                  * local send
4422                                  */
4423                                 prev_scope = sin6->sin6_scope_id;
4424                                 prev_port = sin6->sin6_port;
4425                         }
4426                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4427                                 /* failed to prepend data, give up */
4428                                 sctp_m_freem(m);
4429                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4430                                 return (ENOMEM);
4431                         }
4432                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4433                         if (port) {
4434 #if defined(SCTP_WITH_NO_CSUM)
4435                                 SCTP_STAT_INCR(sctps_sendnocrc);
4436 #else
4437                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4438                                 SCTP_STAT_INCR(sctps_sendswcrc);
4439 #endif
4440                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4441                                         udp->uh_sum = 0xffff;
4442                                 }
4443                         } else {
4444 #if defined(SCTP_WITH_NO_CSUM)
4445                                 SCTP_STAT_INCR(sctps_sendnocrc);
4446 #else
4447                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4448                                 m->m_pkthdr.csum_data = 0;
4449                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4450 #endif
4451                         }
4452                         /* send it out. table id is taken from stcb */
4453 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4454                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4455                                 so = SCTP_INP_SO(inp);
4456                                 SCTP_SOCKET_UNLOCK(so, 0);
4457                         }
4458 #endif
4459 #ifdef SCTP_PACKET_LOGGING
4460                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4461                                 sctp_packet_log(o_pak);
4462 #endif
4463                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4464 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4465                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4466                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4467                                 SCTP_TCB_UNLOCK(stcb);
4468                                 SCTP_SOCKET_LOCK(so, 0);
4469                                 SCTP_TCB_LOCK(stcb);
4470                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4471                         }
4472 #endif
4473                         if (net) {
4474                                 /* for link local this must be done */
4475                                 sin6->sin6_scope_id = prev_scope;
4476                                 sin6->sin6_port = prev_port;
4477                         }
4478                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4479                         SCTP_STAT_INCR(sctps_sendpackets);
4480                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4481                         if (ret) {
4482                                 SCTP_STAT_INCR(sctps_senderrors);
4483                         }
4484                         if (net == NULL) {
4485                                 /* Now if we had a temp route free it */
4486                                 RO_RTFREE(ro);
4487                         } else {
4488                                 /*
4489                                  * PMTU check versus smallest asoc MTU goes
4490                                  * here
4491                                  */
4492                                 if (ro->ro_rt == NULL) {
4493                                         /* Route was freed */
4494                                         if (net->ro._s_addr &&
4495                                             net->src_addr_selected) {
4496                                                 sctp_free_ifa(net->ro._s_addr);
4497                                                 net->ro._s_addr = NULL;
4498                                         }
4499                                         net->src_addr_selected = 0;
4500                                 }
4501                                 if ((ro->ro_rt != NULL) &&
4502                                     (net->ro._s_addr)) {
4503                                         uint32_t mtu;
4504
4505                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4506                                         if (mtu &&
4507                                             (stcb->asoc.smallest_mtu > mtu)) {
4508                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4509                                                 net->mtu = mtu;
4510                                                 if (net->port) {
4511                                                         net->mtu -= sizeof(struct udphdr);
4512                                                 }
4513                                         }
4514                                 } else if (ifp) {
4515                                         if (ND_IFINFO(ifp)->linkmtu &&
4516                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4517                                                 sctp_mtu_size_reset(inp,
4518                                                     &stcb->asoc,
4519                                                     ND_IFINFO(ifp)->linkmtu);
4520                                         }
4521                                 }
4522                         }
4523                         return (ret);
4524                 }
4525 #endif
4526         default:
4527                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4528                     ((struct sockaddr *)to)->sa_family);
4529                 sctp_m_freem(m);
4530                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4531                 return (EFAULT);
4532         }
4533 }
4534
4535
4536 void
4537 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4538 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4539     SCTP_UNUSED
4540 #endif
4541 )
4542 {
4543         struct mbuf *m;
4544         struct sctp_nets *net;
4545         struct sctp_init_chunk *init;
4546         struct sctp_supported_addr_param *sup_addr;
4547         struct sctp_adaptation_layer_indication *ali;
4548         struct sctp_supported_chunk_types_param *pr_supported;
4549         struct sctp_paramhdr *ph;
4550         int cnt_inits_to = 0;
4551         int ret;
4552         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4553
4554         /* INIT's always go to the primary (and usually ONLY address) */
4555         net = stcb->asoc.primary_destination;
4556         if (net == NULL) {
4557                 net = TAILQ_FIRST(&stcb->asoc.nets);
4558                 if (net == NULL) {
4559                         /* TSNH */
4560                         return;
4561                 }
4562                 /* we confirm any address we send an INIT to */
4563                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4564                 (void)sctp_set_primary_addr(stcb, NULL, net);
4565         } else {
4566                 /* we confirm any address we send an INIT to */
4567                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4568         }
4569         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4570 #ifdef INET6
4571         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4572                 /*
4573                  * special hook, if we are sending to link local it will not
4574                  * show up in our private address count.
4575                  */
4576                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4577                         cnt_inits_to = 1;
4578         }
4579 #endif
4580         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4581                 /* This case should not happen */
4582                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4583                 return;
4584         }
4585         /* start the INIT timer */
4586         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4587
4588         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4589         if (m == NULL) {
4590                 /* No memory, INIT timer will re-attempt. */
4591                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4592                 return;
4593         }
4594         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4595         padding_len = 0;
4596         /*
4597          * assume peer supports asconf in order to be able to queue local
4598          * address changes while an INIT is in flight and before the assoc
4599          * is established.
4600          */
4601         stcb->asoc.peer_supports_asconf = 1;
4602         /* Now lets put the chunk header in place */
4603         init = mtod(m, struct sctp_init_chunk *);
4604         /* now the chunk header */
4605         init->ch.chunk_type = SCTP_INITIATION;
4606         init->ch.chunk_flags = 0;
4607         /* fill in later from mbuf we build */
4608         init->ch.chunk_length = 0;
4609         /* place in my tag */
4610         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4611         /* set up some of the credits. */
4612         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4613             SCTP_MINIMAL_RWND));
4614         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4615         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4616         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4617
4618         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4619                 uint8_t i;
4620
4621                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4622                 if (stcb->asoc.scope.ipv4_addr_legal) {
4623                         parameter_len += (uint16_t) sizeof(uint16_t);
4624                 }
4625                 if (stcb->asoc.scope.ipv6_addr_legal) {
4626                         parameter_len += (uint16_t) sizeof(uint16_t);
4627                 }
4628                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4629                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4630                 sup_addr->ph.param_length = htons(parameter_len);
4631                 i = 0;
4632                 if (stcb->asoc.scope.ipv4_addr_legal) {
4633                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4634                 }
4635                 if (stcb->asoc.scope.ipv6_addr_legal) {
4636                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4637                 }
4638                 padding_len = 4 - 2 * i;
4639                 chunk_len += parameter_len;
4640         }
4641         /* Adaptation layer indication parameter */
4642         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4643                 if (padding_len > 0) {
4644                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4645                         chunk_len += padding_len;
4646                         padding_len = 0;
4647                 }
4648                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4649                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4650                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4651                 ali->ph.param_length = htons(parameter_len);
4652                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4653                 chunk_len += parameter_len;
4654         }
4655         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4656                 /* Add NAT friendly parameter. */
4657                 if (padding_len > 0) {
4658                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4659                         chunk_len += padding_len;
4660                         padding_len = 0;
4661                 }
4662                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4663                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4664                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4665                 ph->param_length = htons(parameter_len);
4666                 chunk_len += parameter_len;
4667         }
4668         /* now any cookie time extensions */
4669         if (stcb->asoc.cookie_preserve_req) {
4670                 struct sctp_cookie_perserve_param *cookie_preserve;
4671
4672                 if (padding_len > 0) {
4673                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4674                         chunk_len += padding_len;
4675                         padding_len = 0;
4676                 }
4677                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4678                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4679                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4680                 cookie_preserve->ph.param_length = htons(parameter_len);
4681                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4682                 stcb->asoc.cookie_preserve_req = 0;
4683                 chunk_len += parameter_len;
4684         }
4685         /* ECN parameter */
4686         if (stcb->asoc.ecn_allowed == 1) {
4687                 if (padding_len > 0) {
4688                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4689                         chunk_len += padding_len;
4690                         padding_len = 0;
4691                 }
4692                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4693                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4694                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4695                 ph->param_length = htons(parameter_len);
4696                 chunk_len += parameter_len;
4697         }
4698         /* And now tell the peer we do support PR-SCTP. */
4699         if (padding_len > 0) {
4700                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4701                 chunk_len += padding_len;
4702                 padding_len = 0;
4703         }
4704         parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4705         ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4706         ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4707         ph->param_length = htons(parameter_len);
4708         chunk_len += parameter_len;
4709
4710         /* And now tell the peer we do all the extensions */
4711         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4712         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4713         num_ext = 0;
4714         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4715         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4716         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4717         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4718         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4719         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4720                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4721         }
4722         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4723                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4724         }
4725         parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4726         pr_supported->ph.param_length = htons(parameter_len);
4727         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4728         chunk_len += parameter_len;
4729
4730         /* add authentication parameters */
4731         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4732                 /* attach RANDOM parameter, if available */
4733                 if (stcb->asoc.authinfo.random != NULL) {
4734                         struct sctp_auth_random *randp;
4735
4736                         if (padding_len > 0) {
4737                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4738                                 chunk_len += padding_len;
4739                                 padding_len = 0;
4740                         }
4741                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4742                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4743                         /* random key already contains the header */
4744                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4745                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4746                         chunk_len += parameter_len;
4747                 }
4748                 /* add HMAC_ALGO parameter */
4749                 if ((stcb->asoc.local_hmacs != NULL) &&
4750                     (stcb->asoc.local_hmacs->num_algo > 0)) {
4751                         struct sctp_auth_hmac_algo *hmacs;
4752
4753                         if (padding_len > 0) {
4754                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4755                                 chunk_len += padding_len;
4756                                 padding_len = 0;
4757                         }
4758                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4759                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4760                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4761                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4762                         hmacs->ph.param_length = htons(parameter_len);
4763                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4764                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4765                         chunk_len += parameter_len;
4766                 }
4767                 /* add CHUNKS parameter */
4768                 if (sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks) > 0) {
4769                         struct sctp_auth_chunk_list *chunks;
4770
4771                         if (padding_len > 0) {
4772                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4773                                 chunk_len += padding_len;
4774                                 padding_len = 0;
4775                         }
4776                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4777                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4778                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4779                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4780                         chunks->ph.param_length = htons(parameter_len);
4781                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4782                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4783                         chunk_len += parameter_len;
4784                 }
4785         }
4786         SCTP_BUF_LEN(m) = chunk_len;
4787
4788         /* now the addresses */
4789         /*
4790          * To optimize this we could put the scoping stuff into a structure
4791          * and remove the individual uint8's from the assoc structure. Then
4792          * we could just sifa in the address within the stcb. But for now
4793          * this is a quick hack to get the address stuff teased apart.
4794          */
4795         sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope, m, cnt_inits_to, &padding_len, &chunk_len);
4796
4797         init->ch.chunk_length = htons(chunk_len);
4798         if (padding_len > 0) {
4799                 struct mbuf *m_at, *mp_last;
4800
4801                 mp_last = NULL;
4802                 for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4803                         if (SCTP_BUF_NEXT(m_at) == NULL)
4804                                 mp_last = m_at;
4805                 }
4806                 if ((mp_last == NULL) || sctp_add_pad_tombuf(mp_last, padding_len)) {
4807                         sctp_m_freem(m);
4808                         return;
4809                 }
4810         }
4811         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4812         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4813             (struct sockaddr *)&net->ro._l_addr,
4814             m, 0, NULL, 0, 0, 0, 0,
4815             inp->sctp_lport, stcb->rport, htonl(0),
4816             net->port, NULL,
4817             0, 0,
4818             so_locked);
4819         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4820         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4821         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4822 }
4823
4824 struct mbuf *
4825 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4826     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4827 {
4828         /*
4829          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4830          * being equal to the beginning of the params i.e. (iphlen +
4831          * sizeof(struct sctp_init_msg) parse through the parameters to the
4832          * end of the mbuf verifying that all parameters are known.
4833          *
4834          * For unknown parameters build and return a mbuf with
4835          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4836          * processing this chunk stop, and set *abort_processing to 1.
4837          *
4838          * By having param_offset be pre-set to where parameters begin it is
4839          * hoped that this routine may be reused in the future by new
4840          * features.
4841          */
4842         struct sctp_paramhdr *phdr, params;
4843
4844         struct mbuf *mat, *op_err;
4845         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4846         int at, limit, pad_needed;
4847         uint16_t ptype, plen, padded_size;
4848         int err_at;
4849
4850         *abort_processing = 0;
4851         mat = in_initpkt;
4852         err_at = 0;
4853         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4854         at = param_offset;
4855         op_err = NULL;
4856         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4857         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4858         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4859                 ptype = ntohs(phdr->param_type);
4860                 plen = ntohs(phdr->param_length);
4861                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4862                         /* wacked parameter */
4863                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4864                         goto invalid_size;
4865                 }
4866                 limit -= SCTP_SIZE32(plen);
4867                 /*-
4868                  * All parameters for all chunks that we know/understand are
4869                  * listed here. We process them other places and make
4870                  * appropriate stop actions per the upper bits. However this
4871                  * is the generic routine processor's can call to get back
4872                  * an operr.. to either incorporate (init-ack) or send.
4873                  */
4874                 padded_size = SCTP_SIZE32(plen);
4875                 switch (ptype) {
4876                         /* Param's with variable size */
4877                 case SCTP_HEARTBEAT_INFO:
4878                 case SCTP_STATE_COOKIE:
4879                 case SCTP_UNRECOG_PARAM:
4880                 case SCTP_ERROR_CAUSE_IND:
4881                         /* ok skip fwd */
4882                         at += padded_size;
4883                         break;
4884                         /* Param's with variable size within a range */
4885                 case SCTP_CHUNK_LIST:
4886                 case SCTP_SUPPORTED_CHUNK_EXT:
4887                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4888                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4889                                 goto invalid_size;
4890                         }
4891                         at += padded_size;
4892                         break;
4893                 case SCTP_SUPPORTED_ADDRTYPE:
4894                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4895                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4896                                 goto invalid_size;
4897                         }
4898                         at += padded_size;
4899                         break;
4900                 case SCTP_RANDOM:
4901                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4902                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4903                                 goto invalid_size;
4904                         }
4905                         at += padded_size;
4906                         break;
4907                 case SCTP_SET_PRIM_ADDR:
4908                 case SCTP_DEL_IP_ADDRESS:
4909                 case SCTP_ADD_IP_ADDRESS:
4910                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4911                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4912                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4913                                 goto invalid_size;
4914                         }
4915                         at += padded_size;
4916                         break;
4917                         /* Param's with a fixed size */
4918                 case SCTP_IPV4_ADDRESS:
4919                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4920                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4921                                 goto invalid_size;
4922                         }
4923                         at += padded_size;
4924                         break;
4925                 case SCTP_IPV6_ADDRESS:
4926                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4927                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4928                                 goto invalid_size;
4929                         }
4930                         at += padded_size;
4931                         break;
4932                 case SCTP_COOKIE_PRESERVE:
4933                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4934                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4935                                 goto invalid_size;
4936                         }
4937                         at += padded_size;
4938                         break;
4939                 case SCTP_HAS_NAT_SUPPORT:
4940                         *nat_friendly = 1;
4941                         /* fall through */
4942                 case SCTP_PRSCTP_SUPPORTED:
4943
4944                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4945                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4946                                 goto invalid_size;
4947                         }
4948                         at += padded_size;
4949                         break;
4950                 case SCTP_ECN_CAPABLE:
4951                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4952                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4953                                 goto invalid_size;
4954                         }
4955                         at += padded_size;
4956                         break;
4957                 case SCTP_ULP_ADAPTATION:
4958                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4959                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4960                                 goto invalid_size;
4961                         }
4962                         at += padded_size;
4963                         break;
4964                 case SCTP_SUCCESS_REPORT:
4965                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4966                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4967                                 goto invalid_size;
4968                         }
4969                         at += padded_size;
4970                         break;
4971                 case SCTP_HOSTNAME_ADDRESS:
4972                         {
4973                                 /* We can NOT handle HOST NAME addresses!! */
4974                                 int l_len;
4975
4976                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4977                                 *abort_processing = 1;
4978                                 if (op_err == NULL) {
4979                                         /* Ok need to try to get a mbuf */
4980 #ifdef INET6
4981                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4982 #else
4983                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4984 #endif
4985                                         l_len += plen;
4986                                         l_len += sizeof(struct sctp_paramhdr);
4987                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4988                                         if (op_err) {
4989                                                 SCTP_BUF_LEN(op_err) = 0;
4990                                                 /*
4991                                                  * pre-reserve space for ip
4992                                                  * and sctp header  and
4993                                                  * chunk hdr
4994                                                  */
4995 #ifdef INET6
4996                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
4997 #else
4998                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
4999 #endif
5000                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5001                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5002                                         }
5003                                 }
5004                                 if (op_err) {
5005                                         /* If we have space */
5006                                         struct sctp_paramhdr s;
5007
5008                                         if (err_at % 4) {
5009                                                 uint32_t cpthis = 0;
5010
5011                                                 pad_needed = 4 - (err_at % 4);
5012                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5013                                                 err_at += pad_needed;
5014                                         }
5015                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5016                                         s.param_length = htons(sizeof(s) + plen);
5017                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5018                                         err_at += sizeof(s);
5019                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5020                                         if (phdr == NULL) {
5021                                                 sctp_m_freem(op_err);
5022                                                 /*
5023                                                  * we are out of memory but
5024                                                  * we still need to have a
5025                                                  * look at what to do (the
5026                                                  * system is in trouble
5027                                                  * though).
5028                                                  */
5029                                                 return (NULL);
5030                                         }
5031                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5032                                 }
5033                                 return (op_err);
5034                                 break;
5035                         }
5036                 default:
5037                         /*
5038                          * we do not recognize the parameter figure out what
5039                          * we do.
5040                          */
5041                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5042                         if ((ptype & 0x4000) == 0x4000) {
5043                                 /* Report bit is set?? */
5044                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5045                                 if (op_err == NULL) {
5046                                         int l_len;
5047
5048                                         /* Ok need to try to get an mbuf */
5049 #ifdef INET6
5050                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5051 #else
5052                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5053 #endif
5054                                         l_len += plen;
5055                                         l_len += sizeof(struct sctp_paramhdr);
5056                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5057                                         if (op_err) {
5058                                                 SCTP_BUF_LEN(op_err) = 0;
5059 #ifdef INET6
5060                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5061 #else
5062                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5063 #endif
5064                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5065                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5066                                         }
5067                                 }
5068                                 if (op_err) {
5069                                         /* If we have space */
5070                                         struct sctp_paramhdr s;
5071
5072                                         if (err_at % 4) {
5073                                                 uint32_t cpthis = 0;
5074
5075                                                 pad_needed = 4 - (err_at % 4);
5076                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5077                                                 err_at += pad_needed;
5078                                         }
5079                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5080                                         s.param_length = htons(sizeof(s) + plen);
5081                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5082                                         err_at += sizeof(s);
5083                                         if (plen > sizeof(tempbuf)) {
5084                                                 plen = sizeof(tempbuf);
5085                                         }
5086                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5087                                         if (phdr == NULL) {
5088                                                 sctp_m_freem(op_err);
5089                                                 /*
5090                                                  * we are out of memory but
5091                                                  * we still need to have a
5092                                                  * look at what to do (the
5093                                                  * system is in trouble
5094                                                  * though).
5095                                                  */
5096                                                 op_err = NULL;
5097                                                 goto more_processing;
5098                                         }
5099                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5100                                         err_at += plen;
5101                                 }
5102                         }
5103         more_processing:
5104                         if ((ptype & 0x8000) == 0x0000) {
5105                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5106                                 return (op_err);
5107                         } else {
5108                                 /* skip this chunk and continue processing */
5109                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5110                                 at += SCTP_SIZE32(plen);
5111                         }
5112                         break;
5113
5114                 }
5115                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5116         }
5117         return (op_err);
5118 invalid_size:
5119         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5120         *abort_processing = 1;
5121         if ((op_err == NULL) && phdr) {
5122                 int l_len;
5123
5124 #ifdef INET6
5125                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5126 #else
5127                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5128 #endif
5129                 l_len += (2 * sizeof(struct sctp_paramhdr));
5130                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5131                 if (op_err) {
5132                         SCTP_BUF_LEN(op_err) = 0;
5133 #ifdef INET6
5134                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5135 #else
5136                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5137 #endif
5138                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5139                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5140                 }
5141         }
5142         if ((op_err) && phdr) {
5143                 struct sctp_paramhdr s;
5144
5145                 if (err_at % 4) {
5146                         uint32_t cpthis = 0;
5147
5148                         pad_needed = 4 - (err_at % 4);
5149                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5150                         err_at += pad_needed;
5151                 }
5152                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5153                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5154                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5155                 err_at += sizeof(s);
5156                 /* Only copy back the p-hdr that caused the issue */
5157                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5158         }
5159         return (op_err);
5160 }
5161
5162 static int
5163 sctp_are_there_new_addresses(struct sctp_association *asoc,
5164     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5165 {
5166         /*
5167          * Given a INIT packet, look through the packet to verify that there
5168          * are NO new addresses. As we go through the parameters add reports
5169          * of any un-understood parameters that require an error.  Also we
5170          * must return (1) to drop the packet if we see a un-understood
5171          * parameter that tells us to drop the chunk.
5172          */
5173         struct sockaddr *sa_touse;
5174         struct sockaddr *sa;
5175         struct sctp_paramhdr *phdr, params;
5176         uint16_t ptype, plen;
5177         uint8_t fnd;
5178         struct sctp_nets *net;
5179
5180 #ifdef INET
5181         struct sockaddr_in sin4, *sa4;
5182
5183 #endif
5184 #ifdef INET6
5185         struct sockaddr_in6 sin6, *sa6;
5186
5187 #endif
5188
5189 #ifdef INET
5190         memset(&sin4, 0, sizeof(sin4));
5191         sin4.sin_family = AF_INET;
5192         sin4.sin_len = sizeof(sin4);
5193 #endif
5194 #ifdef INET6
5195         memset(&sin6, 0, sizeof(sin6));
5196         sin6.sin6_family = AF_INET6;
5197         sin6.sin6_len = sizeof(sin6);
5198 #endif
5199         /* First what about the src address of the pkt ? */
5200         fnd = 0;
5201         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5202                 sa = (struct sockaddr *)&net->ro._l_addr;
5203                 if (sa->sa_family == src->sa_family) {
5204 #ifdef INET
5205                         if (sa->sa_family == AF_INET) {
5206                                 struct sockaddr_in *src4;
5207
5208                                 sa4 = (struct sockaddr_in *)sa;
5209                                 src4 = (struct sockaddr_in *)src;
5210                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5211                                         fnd = 1;
5212                                         break;
5213                                 }
5214                         }
5215 #endif
5216 #ifdef INET6
5217                         if (sa->sa_family == AF_INET6) {
5218                                 struct sockaddr_in6 *src6;
5219
5220                                 sa6 = (struct sockaddr_in6 *)sa;
5221                                 src6 = (struct sockaddr_in6 *)src;
5222                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5223                                         fnd = 1;
5224                                         break;
5225                                 }
5226                         }
5227 #endif
5228                 }
5229         }
5230         if (fnd == 0) {
5231                 /* New address added! no need to look futher. */
5232                 return (1);
5233         }
5234         /* Ok so far lets munge through the rest of the packet */
5235         offset += sizeof(struct sctp_init_chunk);
5236         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5237         while (phdr) {
5238                 sa_touse = NULL;
5239                 ptype = ntohs(phdr->param_type);
5240                 plen = ntohs(phdr->param_length);
5241                 switch (ptype) {
5242 #ifdef INET
5243                 case SCTP_IPV4_ADDRESS:
5244                         {
5245                                 struct sctp_ipv4addr_param *p4, p4_buf;
5246
5247                                 phdr = sctp_get_next_param(in_initpkt, offset,
5248                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5249                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5250                                     phdr == NULL) {
5251                                         return (1);
5252                                 }
5253                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5254                                 sin4.sin_addr.s_addr = p4->addr;
5255                                 sa_touse = (struct sockaddr *)&sin4;
5256                                 break;
5257                         }
5258 #endif
5259 #ifdef INET6
5260                 case SCTP_IPV6_ADDRESS:
5261                         {
5262                                 struct sctp_ipv6addr_param *p6, p6_buf;
5263
5264                                 phdr = sctp_get_next_param(in_initpkt, offset,
5265                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5266                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5267                                     phdr == NULL) {
5268                                         return (1);
5269                                 }
5270                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5271                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5272                                     sizeof(p6->addr));
5273                                 sa_touse = (struct sockaddr *)&sin6;
5274                                 break;
5275                         }
5276 #endif
5277                 default:
5278                         sa_touse = NULL;
5279                         break;
5280                 }
5281                 if (sa_touse) {
5282                         /* ok, sa_touse points to one to check */
5283                         fnd = 0;
5284                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5285                                 sa = (struct sockaddr *)&net->ro._l_addr;
5286                                 if (sa->sa_family != sa_touse->sa_family) {
5287                                         continue;
5288                                 }
5289 #ifdef INET
5290                                 if (sa->sa_family == AF_INET) {
5291                                         sa4 = (struct sockaddr_in *)sa;
5292                                         if (sa4->sin_addr.s_addr ==
5293                                             sin4.sin_addr.s_addr) {
5294                                                 fnd = 1;
5295                                                 break;
5296                                         }
5297                                 }
5298 #endif
5299 #ifdef INET6
5300                                 if (sa->sa_family == AF_INET6) {
5301                                         sa6 = (struct sockaddr_in6 *)sa;
5302                                         if (SCTP6_ARE_ADDR_EQUAL(
5303                                             sa6, &sin6)) {
5304                                                 fnd = 1;
5305                                                 break;
5306                                         }
5307                                 }
5308 #endif
5309                         }
5310                         if (!fnd) {
5311                                 /* New addr added! no need to look further */
5312                                 return (1);
5313                         }
5314                 }
5315                 offset += SCTP_SIZE32(plen);
5316                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5317         }
5318         return (0);
5319 }
5320
5321 /*
5322  * Given a MBUF chain that was sent into us containing an INIT. Build a
5323  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5324  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5325  * message (i.e. the struct sctp_init_msg).
5326  */
5327 void
5328 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5329     struct mbuf *init_pkt, int iphlen, int offset,
5330     struct sockaddr *src, struct sockaddr *dst,
5331     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5332     uint8_t use_mflowid, uint32_t mflowid,
5333     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5334 {
5335         struct sctp_association *asoc;
5336         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5337         struct sctp_init_ack_chunk *initack;
5338         struct sctp_adaptation_layer_indication *ali;
5339         struct sctp_ecn_supported_param *ecn;
5340         struct sctp_prsctp_supported_param *prsctp;
5341         struct sctp_supported_chunk_types_param *pr_supported;
5342         union sctp_sockstore *over_addr;
5343
5344 #ifdef INET
5345         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5346         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5347         struct sockaddr_in *sin;
5348
5349 #endif
5350 #ifdef INET6
5351         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5352         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5353         struct sockaddr_in6 *sin6;
5354
5355 #endif
5356         struct sockaddr *to;
5357         struct sctp_state_cookie stc;
5358         struct sctp_nets *net = NULL;
5359         uint8_t *signature = NULL;
5360         int cnt_inits_to = 0;
5361         uint16_t his_limit, i_want;
5362         int abort_flag, padval;
5363         int num_ext;
5364         int p_len;
5365         int nat_friendly = 0;
5366         struct socket *so;
5367
5368         if (stcb) {
5369                 asoc = &stcb->asoc;
5370         } else {
5371                 asoc = NULL;
5372         }
5373         mp_last = NULL;
5374         if ((asoc != NULL) &&
5375             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5376             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5377                 /* new addresses, out of here in non-cookie-wait states */
5378                 /*
5379                  * Send a ABORT, we don't add the new address error clause
5380                  * though we even set the T bit and copy in the 0 tag.. this
5381                  * looks no different than if no listener was present.
5382                  */
5383                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, NULL,
5384                     use_mflowid, mflowid,
5385                     vrf_id, port);
5386                 return;
5387         }
5388         abort_flag = 0;
5389         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5390             (offset + sizeof(struct sctp_init_chunk)),
5391             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5392         if (abort_flag) {
5393 do_a_abort:
5394                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5395                     init_chk->init.initiate_tag, op_err,
5396                     use_mflowid, mflowid,
5397                     vrf_id, port);
5398                 return;
5399         }
5400         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5401         if (m == NULL) {
5402                 /* No memory, INIT timer will re-attempt. */
5403                 if (op_err)
5404                         sctp_m_freem(op_err);
5405                 return;
5406         }
5407         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5408
5409         /*
5410          * We might not overwrite the identification[] completely and on
5411          * some platforms time_entered will contain some padding. Therefore
5412          * zero out the cookie to avoid putting uninitialized memory on the
5413          * wire.
5414          */
5415         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5416
5417         /* the time I built cookie */
5418         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5419
5420         /* populate any tie tags */
5421         if (asoc != NULL) {
5422                 /* unlock before tag selections */
5423                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5424                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5425                 stc.cookie_life = asoc->cookie_life;
5426                 net = asoc->primary_destination;
5427         } else {
5428                 stc.tie_tag_my_vtag = 0;
5429                 stc.tie_tag_peer_vtag = 0;
5430                 /* life I will award this cookie */
5431                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5432         }
5433
5434         /* copy in the ports for later check */
5435         stc.myport = sh->dest_port;
5436         stc.peerport = sh->src_port;
5437
5438         /*
5439          * If we wanted to honor cookie life extentions, we would add to
5440          * stc.cookie_life. For now we should NOT honor any extension
5441          */
5442         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5443         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5444                 stc.ipv6_addr_legal = 1;
5445                 if (SCTP_IPV6_V6ONLY(inp)) {
5446                         stc.ipv4_addr_legal = 0;
5447                 } else {
5448                         stc.ipv4_addr_legal = 1;
5449                 }
5450         } else {
5451                 stc.ipv6_addr_legal = 0;
5452                 stc.ipv4_addr_legal = 1;
5453         }
5454 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5455         stc.ipv4_scope = 1;
5456 #else
5457         stc.ipv4_scope = 0;
5458 #endif
5459         if (net == NULL) {
5460                 to = src;
5461                 switch (dst->sa_family) {
5462 #ifdef INET
5463                 case AF_INET:
5464                         {
5465                                 /* lookup address */
5466                                 stc.address[0] = src4->sin_addr.s_addr;
5467                                 stc.address[1] = 0;
5468                                 stc.address[2] = 0;
5469                                 stc.address[3] = 0;
5470                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5471                                 /* local from address */
5472                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5473                                 stc.laddress[1] = 0;
5474                                 stc.laddress[2] = 0;
5475                                 stc.laddress[3] = 0;
5476                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5477                                 /* scope_id is only for v6 */
5478                                 stc.scope_id = 0;
5479 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5480                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5481                                         stc.ipv4_scope = 1;
5482                                 }
5483 #else
5484                                 stc.ipv4_scope = 1;
5485 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5486                                 /* Must use the address in this case */
5487                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5488                                         stc.loopback_scope = 1;
5489                                         stc.ipv4_scope = 1;
5490                                         stc.site_scope = 1;
5491                                         stc.local_scope = 0;
5492                                 }
5493                                 break;
5494                         }
5495 #endif
5496 #ifdef INET6
5497                 case AF_INET6:
5498                         {
5499                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5500                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5501                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5502                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5503                                         stc.loopback_scope = 1;
5504                                         stc.local_scope = 0;
5505                                         stc.site_scope = 1;
5506                                         stc.ipv4_scope = 1;
5507                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5508                                         /*
5509                                          * If the new destination is a
5510                                          * LINK_LOCAL we must have common
5511                                          * both site and local scope. Don't
5512                                          * set local scope though since we
5513                                          * must depend on the source to be
5514                                          * added implicitly. We cannot
5515                                          * assure just because we share one
5516                                          * link that all links are common.
5517                                          */
5518                                         stc.local_scope = 0;
5519                                         stc.site_scope = 1;
5520                                         stc.ipv4_scope = 1;
5521                                         /*
5522                                          * we start counting for the private
5523                                          * address stuff at 1. since the
5524                                          * link local we source from won't
5525                                          * show up in our scoped count.
5526                                          */
5527                                         cnt_inits_to = 1;
5528                                         /*
5529                                          * pull out the scope_id from
5530                                          * incoming pkt
5531                                          */
5532                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5533                                         /*
5534                                          * If the new destination is
5535                                          * SITE_LOCAL then we must have site
5536                                          * scope in common.
5537                                          */
5538                                         stc.site_scope = 1;
5539                                 }
5540                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5541                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5542                                 break;
5543                         }
5544 #endif
5545                 default:
5546                         /* TSNH */
5547                         goto do_a_abort;
5548                         break;
5549                 }
5550         } else {
5551                 /* set the scope per the existing tcb */
5552
5553 #ifdef INET6
5554                 struct sctp_nets *lnet;
5555
5556 #endif
5557
5558                 stc.loopback_scope = asoc->scope.loopback_scope;
5559                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5560                 stc.site_scope = asoc->scope.site_scope;
5561                 stc.local_scope = asoc->scope.local_scope;
5562 #ifdef INET6
5563                 /* Why do we not consider IPv4 LL addresses? */
5564                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5565                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5566                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5567                                         /*
5568                                          * if we have a LL address, start
5569                                          * counting at 1.
5570                                          */
5571                                         cnt_inits_to = 1;
5572                                 }
5573                         }
5574                 }
5575 #endif
5576                 /* use the net pointer */
5577                 to = (struct sockaddr *)&net->ro._l_addr;
5578                 switch (to->sa_family) {
5579 #ifdef INET
5580                 case AF_INET:
5581                         sin = (struct sockaddr_in *)to;
5582                         stc.address[0] = sin->sin_addr.s_addr;
5583                         stc.address[1] = 0;
5584                         stc.address[2] = 0;
5585                         stc.address[3] = 0;
5586                         stc.addr_type = SCTP_IPV4_ADDRESS;
5587                         if (net->src_addr_selected == 0) {
5588                                 /*
5589                                  * strange case here, the INIT should have
5590                                  * did the selection.
5591                                  */
5592                                 net->ro._s_addr = sctp_source_address_selection(inp,
5593                                     stcb, (sctp_route_t *) & net->ro,
5594                                     net, 0, vrf_id);
5595                                 if (net->ro._s_addr == NULL)
5596                                         return;
5597
5598                                 net->src_addr_selected = 1;
5599
5600                         }
5601                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5602                         stc.laddress[1] = 0;
5603                         stc.laddress[2] = 0;
5604                         stc.laddress[3] = 0;
5605                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5606                         /* scope_id is only for v6 */
5607                         stc.scope_id = 0;
5608                         break;
5609 #endif
5610 #ifdef INET6
5611                 case AF_INET6:
5612                         sin6 = (struct sockaddr_in6 *)to;
5613                         memcpy(&stc.address, &sin6->sin6_addr,
5614                             sizeof(struct in6_addr));
5615                         stc.addr_type = SCTP_IPV6_ADDRESS;
5616                         stc.scope_id = sin6->sin6_scope_id;
5617                         if (net->src_addr_selected == 0) {
5618                                 /*
5619                                  * strange case here, the INIT should have
5620                                  * done the selection.
5621                                  */
5622                                 net->ro._s_addr = sctp_source_address_selection(inp,
5623                                     stcb, (sctp_route_t *) & net->ro,
5624                                     net, 0, vrf_id);
5625                                 if (net->ro._s_addr == NULL)
5626                                         return;
5627
5628                                 net->src_addr_selected = 1;
5629                         }
5630                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5631                             sizeof(struct in6_addr));
5632                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5633                         break;
5634 #endif
5635                 }
5636         }
5637         /* Now lets put the SCTP header in place */
5638         initack = mtod(m, struct sctp_init_ack_chunk *);
5639         /* Save it off for quick ref */
5640         stc.peers_vtag = init_chk->init.initiate_tag;
5641         /* who are we */
5642         memcpy(stc.identification, SCTP_VERSION_STRING,
5643             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5644         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5645         /* now the chunk header */
5646         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5647         initack->ch.chunk_flags = 0;
5648         /* fill in later from mbuf we build */
5649         initack->ch.chunk_length = 0;
5650         /* place in my tag */
5651         if ((asoc != NULL) &&
5652             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5653             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5654             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5655                 /* re-use the v-tags and init-seq here */
5656                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5657                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5658         } else {
5659                 uint32_t vtag, itsn;
5660
5661                 if (hold_inp_lock) {
5662                         SCTP_INP_INCR_REF(inp);
5663                         SCTP_INP_RUNLOCK(inp);
5664                 }
5665                 if (asoc) {
5666                         atomic_add_int(&asoc->refcnt, 1);
5667                         SCTP_TCB_UNLOCK(stcb);
5668         new_tag:
5669                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5670                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5671                                 /*
5672                                  * Got a duplicate vtag on some guy behind a
5673                                  * nat make sure we don't use it.
5674                                  */
5675                                 goto new_tag;
5676                         }
5677                         initack->init.initiate_tag = htonl(vtag);
5678                         /* get a TSN to use too */
5679                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5680                         initack->init.initial_tsn = htonl(itsn);
5681                         SCTP_TCB_LOCK(stcb);
5682                         atomic_add_int(&asoc->refcnt, -1);
5683                 } else {
5684                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5685                         initack->init.initiate_tag = htonl(vtag);
5686                         /* get a TSN to use too */
5687                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5688                 }
5689                 if (hold_inp_lock) {
5690                         SCTP_INP_RLOCK(inp);
5691                         SCTP_INP_DECR_REF(inp);
5692                 }
5693         }
5694         /* save away my tag to */
5695         stc.my_vtag = initack->init.initiate_tag;
5696
5697         /* set up some of the credits. */
5698         so = inp->sctp_socket;
5699         if (so == NULL) {
5700                 /* memory problem */
5701                 sctp_m_freem(m);
5702                 return;
5703         } else {
5704                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5705         }
5706         /* set what I want */
5707         his_limit = ntohs(init_chk->init.num_inbound_streams);
5708         /* choose what I want */
5709         if (asoc != NULL) {
5710                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5711                         i_want = asoc->streamoutcnt;
5712                 } else {
5713                         i_want = inp->sctp_ep.pre_open_stream_count;
5714                 }
5715         } else {
5716                 i_want = inp->sctp_ep.pre_open_stream_count;
5717         }
5718         if (his_limit < i_want) {
5719                 /* I Want more :< */
5720                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5721         } else {
5722                 /* I can have what I want :> */
5723                 initack->init.num_outbound_streams = htons(i_want);
5724         }
5725         /* tell him his limit. */
5726         initack->init.num_inbound_streams =
5727             htons(inp->sctp_ep.max_open_streams_intome);
5728
5729         /* adaptation layer indication parameter */
5730         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5731                 ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5732                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5733                 ali->ph.param_length = htons(sizeof(*ali));
5734                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5735                 SCTP_BUF_LEN(m) += sizeof(*ali);
5736                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5737         } else {
5738                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)initack + sizeof(*initack));
5739         }
5740
5741         /* ECN parameter */
5742         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5743             (inp->sctp_ecn_enable == 1)) {
5744                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5745                 ecn->ph.param_length = htons(sizeof(*ecn));
5746                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5747
5748                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5749                     sizeof(*ecn));
5750         } else {
5751                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5752         }
5753         /* And now tell the peer we do  pr-sctp */
5754         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5755         prsctp->ph.param_length = htons(sizeof(*prsctp));
5756         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5757         if (nat_friendly) {
5758                 /* Add NAT friendly parameter */
5759                 struct sctp_paramhdr *ph;
5760
5761                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5762                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5763                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5764                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5765         }
5766         /* And now tell the peer we do all the extensions */
5767         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5768         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5769         num_ext = 0;
5770         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5771         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5772         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5773         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5774         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5775         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5776                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5777         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5778                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5779         p_len = sizeof(*pr_supported) + num_ext;
5780         pr_supported->ph.param_length = htons(p_len);
5781         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5782         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5783
5784         /* add authentication parameters */
5785         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5786                 struct sctp_auth_random *randp;
5787                 struct sctp_auth_hmac_algo *hmacs;
5788                 struct sctp_auth_chunk_list *chunks;
5789                 uint16_t random_len;
5790
5791                 /* generate and add RANDOM parameter */
5792                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5793                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5794                 randp->ph.param_type = htons(SCTP_RANDOM);
5795                 p_len = sizeof(*randp) + random_len;
5796                 randp->ph.param_length = htons(p_len);
5797                 SCTP_READ_RANDOM(randp->random_data, random_len);
5798                 /* zero out any padding required */
5799                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5800                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5801
5802                 /* add HMAC_ALGO parameter */
5803                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5804                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5805                     (uint8_t *) hmacs->hmac_ids);
5806                 if (p_len > 0) {
5807                         p_len += sizeof(*hmacs);
5808                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5809                         hmacs->ph.param_length = htons(p_len);
5810                         /* zero out any padding required */
5811                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5812                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5813                 }
5814                 /* add CHUNKS parameter */
5815                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5816                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5817                     chunks->chunk_types);
5818                 if (p_len > 0) {
5819                         p_len += sizeof(*chunks);
5820                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5821                         chunks->ph.param_length = htons(p_len);
5822                         /* zero out any padding required */
5823                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5824                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5825                 }
5826         }
5827         m_at = m;
5828         /* now the addresses */
5829         {
5830                 struct sctp_scoping scp;
5831
5832                 /*
5833                  * To optimize this we could put the scoping stuff into a
5834                  * structure and remove the individual uint8's from the stc
5835                  * structure. Then we could just sifa in the address within
5836                  * the stc.. but for now this is a quick hack to get the
5837                  * address stuff teased apart.
5838                  */
5839                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5840                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5841                 scp.loopback_scope = stc.loopback_scope;
5842                 scp.ipv4_local_scope = stc.ipv4_scope;
5843                 scp.local_scope = stc.local_scope;
5844                 scp.site_scope = stc.site_scope;
5845                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to, NULL, NULL);
5846         }
5847
5848         /* tack on the operational error if present */
5849         if (op_err) {
5850                 struct mbuf *ol;
5851                 int llen;
5852
5853                 llen = 0;
5854                 ol = op_err;
5855
5856                 while (ol) {
5857                         llen += SCTP_BUF_LEN(ol);
5858                         ol = SCTP_BUF_NEXT(ol);
5859                 }
5860                 if (llen % 4) {
5861                         /* must add a pad to the param */
5862                         uint32_t cpthis = 0;
5863                         int padlen;
5864
5865                         padlen = 4 - (llen % 4);
5866                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5867                 }
5868                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5869                         m_at = SCTP_BUF_NEXT(m_at);
5870                 }
5871                 SCTP_BUF_NEXT(m_at) = op_err;
5872                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5873                         m_at = SCTP_BUF_NEXT(m_at);
5874                 }
5875         }
5876         /* pre-calulate the size and update pkt header and chunk header */
5877         p_len = 0;
5878         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5879                 p_len += SCTP_BUF_LEN(m_tmp);
5880                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5881                         /* m_tmp should now point to last one */
5882                         break;
5883                 }
5884         }
5885
5886         /* Now we must build a cookie */
5887         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5888         if (m_cookie == NULL) {
5889                 /* memory problem */
5890                 sctp_m_freem(m);
5891                 return;
5892         }
5893         /* Now append the cookie to the end and update the space/size */
5894         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5895
5896         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5897                 p_len += SCTP_BUF_LEN(m_tmp);
5898                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5899                         /* m_tmp should now point to last one */
5900                         mp_last = m_tmp;
5901                         break;
5902                 }
5903         }
5904         /*
5905          * Place in the size, but we don't include the last pad (if any) in
5906          * the INIT-ACK.
5907          */
5908         initack->ch.chunk_length = htons(p_len);
5909
5910         /*
5911          * Time to sign the cookie, we don't sign over the cookie signature
5912          * though thus we set trailer.
5913          */
5914         (void)sctp_hmac_m(SCTP_HMAC,
5915             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5916             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5917             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5918         /*
5919          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5920          * here since the timer will drive a retranmission.
5921          */
5922         padval = p_len % 4;
5923         if ((padval) && (mp_last)) {
5924                 /* see my previous comments on mp_last */
5925                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
5926                         /* Houston we have a problem, no space */
5927                         sctp_m_freem(m);
5928                         return;
5929                 }
5930         }
5931         if (stc.loopback_scope) {
5932                 over_addr = (union sctp_sockstore *)dst;
5933         } else {
5934                 over_addr = NULL;
5935         }
5936
5937         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5938             0, 0,
5939             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5940             port, over_addr,
5941             use_mflowid, mflowid,
5942             SCTP_SO_NOT_LOCKED);
5943         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5944 }
5945
5946
5947 static void
5948 sctp_prune_prsctp(struct sctp_tcb *stcb,
5949     struct sctp_association *asoc,
5950     struct sctp_sndrcvinfo *srcv,
5951     int dataout)
5952 {
5953         int freed_spc = 0;
5954         struct sctp_tmit_chunk *chk, *nchk;
5955
5956         SCTP_TCB_LOCK_ASSERT(stcb);
5957         if ((asoc->peer_supports_prsctp) &&
5958             (asoc->sent_queue_cnt_removeable > 0)) {
5959                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5960                         /*
5961                          * Look for chunks marked with the PR_SCTP flag AND
5962                          * the buffer space flag. If the one being sent is
5963                          * equal or greater priority then purge the old one
5964                          * and free some space.
5965                          */
5966                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5967                                 /*
5968                                  * This one is PR-SCTP AND buffer space
5969                                  * limited type
5970                                  */
5971                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5972                                         /*
5973                                          * Lower numbers equates to higher
5974                                          * priority so if the one we are
5975                                          * looking at has a larger or equal
5976                                          * priority we want to drop the data
5977                                          * and NOT retransmit it.
5978                                          */
5979                                         if (chk->data) {
5980                                                 /*
5981                                                  * We release the book_size
5982                                                  * if the mbuf is here
5983                                                  */
5984                                                 int ret_spc;
5985                                                 uint8_t sent;
5986
5987                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5988                                                         sent = 1;
5989                                                 else
5990                                                         sent = 0;
5991                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5992                                                     sent,
5993                                                     SCTP_SO_LOCKED);
5994                                                 freed_spc += ret_spc;
5995                                                 if (freed_spc >= dataout) {
5996                                                         return;
5997                                                 }
5998                                         }       /* if chunk was present */
5999                                 }       /* if of sufficent priority */
6000                         }       /* if chunk has enabled */
6001                 }               /* tailqforeach */
6002
6003                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6004                         /* Here we must move to the sent queue and mark */
6005                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6006                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6007                                         if (chk->data) {
6008                                                 /*
6009                                                  * We release the book_size
6010                                                  * if the mbuf is here
6011                                                  */
6012                                                 int ret_spc;
6013
6014                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6015                                                     0, SCTP_SO_LOCKED);
6016
6017                                                 freed_spc += ret_spc;
6018                                                 if (freed_spc >= dataout) {
6019                                                         return;
6020                                                 }
6021                                         }       /* end if chk->data */
6022                                 }       /* end if right class */
6023                         }       /* end if chk pr-sctp */
6024                 }               /* tailqforeachsafe (chk) */
6025         }                       /* if enabled in asoc */
6026 }
6027
6028 int
6029 sctp_get_frag_point(struct sctp_tcb *stcb,
6030     struct sctp_association *asoc)
6031 {
6032         int siz, ovh;
6033
6034         /*
6035          * For endpoints that have both v6 and v4 addresses we must reserve
6036          * room for the ipv6 header, for those that are only dealing with V4
6037          * we use a larger frag point.
6038          */
6039         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6040                 ovh = SCTP_MED_OVERHEAD;
6041         } else {
6042                 ovh = SCTP_MED_V4_OVERHEAD;
6043         }
6044
6045         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6046                 siz = asoc->smallest_mtu - ovh;
6047         else
6048                 siz = (stcb->asoc.sctp_frag_point - ovh);
6049         /*
6050          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6051          */
6052         /* A data chunk MUST fit in a cluster */
6053         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6054         /* } */
6055
6056         /* adjust for an AUTH chunk if DATA requires auth */
6057         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6058                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6059
6060         if (siz % 4) {
6061                 /* make it an even word boundary please */
6062                 siz -= (siz % 4);
6063         }
6064         return (siz);
6065 }
6066
6067 static void
6068 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6069 {
6070         sp->pr_sctp_on = 0;
6071         /*
6072          * We assume that the user wants PR_SCTP_TTL if the user provides a
6073          * positive lifetime but does not specify any PR_SCTP policy. This
6074          * is a BAD assumption and causes problems at least with the
6075          * U-Vancovers MPI folks. I will change this to be no policy means
6076          * NO PR-SCTP.
6077          */
6078         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6079                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6080                 sp->pr_sctp_on = 1;
6081         } else {
6082                 return;
6083         }
6084         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6085         case CHUNK_FLAGS_PR_SCTP_BUF:
6086                 /*
6087                  * Time to live is a priority stored in tv_sec when doing
6088                  * the buffer drop thing.
6089                  */
6090                 sp->ts.tv_sec = sp->timetolive;
6091                 sp->ts.tv_usec = 0;
6092                 break;
6093         case CHUNK_FLAGS_PR_SCTP_TTL:
6094                 {
6095                         struct timeval tv;
6096
6097                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6098                         tv.tv_sec = sp->timetolive / 1000;
6099                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6100                         /*
6101                          * TODO sctp_constants.h needs alternative time
6102                          * macros when _KERNEL is undefined.
6103                          */
6104                         timevaladd(&sp->ts, &tv);
6105                 }
6106                 break;
6107         case CHUNK_FLAGS_PR_SCTP_RTX:
6108                 /*
6109                  * Time to live is a the number or retransmissions stored in
6110                  * tv_sec.
6111                  */
6112                 sp->ts.tv_sec = sp->timetolive;
6113                 sp->ts.tv_usec = 0;
6114                 break;
6115         default:
6116                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6117                     "Unknown PR_SCTP policy %u.\n",
6118                     PR_SCTP_POLICY(sp->sinfo_flags));
6119                 break;
6120         }
6121 }
6122
6123 static int
6124 sctp_msg_append(struct sctp_tcb *stcb,
6125     struct sctp_nets *net,
6126     struct mbuf *m,
6127     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6128 {
6129         int error = 0;
6130         struct mbuf *at;
6131         struct sctp_stream_queue_pending *sp = NULL;
6132         struct sctp_stream_out *strm;
6133
6134         /*
6135          * Given an mbuf chain, put it into the association send queue and
6136          * place it on the wheel
6137          */
6138         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6139                 /* Invalid stream number */
6140                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6141                 error = EINVAL;
6142                 goto out_now;
6143         }
6144         if ((stcb->asoc.stream_locked) &&
6145             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6146                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6147                 error = EINVAL;
6148                 goto out_now;
6149         }
6150         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6151         /* Now can we send this? */
6152         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6153             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6154             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6155             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6156                 /* got data while shutting down */
6157                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6158                 error = ECONNRESET;
6159                 goto out_now;
6160         }
6161         sctp_alloc_a_strmoq(stcb, sp);
6162         if (sp == NULL) {
6163                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6164                 error = ENOMEM;
6165                 goto out_now;
6166         }
6167         sp->sinfo_flags = srcv->sinfo_flags;
6168         sp->timetolive = srcv->sinfo_timetolive;
6169         sp->ppid = srcv->sinfo_ppid;
6170         sp->context = srcv->sinfo_context;
6171         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6172                 sp->net = net;
6173                 atomic_add_int(&sp->net->ref_count, 1);
6174         } else {
6175                 sp->net = NULL;
6176         }
6177         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6178         sp->stream = srcv->sinfo_stream;
6179         sp->msg_is_complete = 1;
6180         sp->sender_all_done = 1;
6181         sp->some_taken = 0;
6182         sp->data = m;
6183         sp->tail_mbuf = NULL;
6184         sctp_set_prsctp_policy(sp);
6185         /*
6186          * We could in theory (for sendall) sifa the length in, but we would
6187          * still have to hunt through the chain since we need to setup the
6188          * tail_mbuf
6189          */
6190         sp->length = 0;
6191         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6192                 if (SCTP_BUF_NEXT(at) == NULL)
6193                         sp->tail_mbuf = at;
6194                 sp->length += SCTP_BUF_LEN(at);
6195         }
6196         if (srcv->sinfo_keynumber_valid) {
6197                 sp->auth_keyid = srcv->sinfo_keynumber;
6198         } else {
6199                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6200         }
6201         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6202                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6203                 sp->holds_key_ref = 1;
6204         }
6205         if (hold_stcb_lock == 0) {
6206                 SCTP_TCB_SEND_LOCK(stcb);
6207         }
6208         sctp_snd_sb_alloc(stcb, sp->length);
6209         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6210         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6211         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6212         m = NULL;
6213         if (hold_stcb_lock == 0) {
6214                 SCTP_TCB_SEND_UNLOCK(stcb);
6215         }
6216 out_now:
6217         if (m) {
6218                 sctp_m_freem(m);
6219         }
6220         return (error);
6221 }
6222
6223
6224 static struct mbuf *
6225 sctp_copy_mbufchain(struct mbuf *clonechain,
6226     struct mbuf *outchain,
6227     struct mbuf **endofchain,
6228     int can_take_mbuf,
6229     int sizeofcpy,
6230     uint8_t copy_by_ref)
6231 {
6232         struct mbuf *m;
6233         struct mbuf *appendchain;
6234         caddr_t cp;
6235         int len;
6236
6237         if (endofchain == NULL) {
6238                 /* error */
6239 error_out:
6240                 if (outchain)
6241                         sctp_m_freem(outchain);
6242                 return (NULL);
6243         }
6244         if (can_take_mbuf) {
6245                 appendchain = clonechain;
6246         } else {
6247                 if (!copy_by_ref &&
6248                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6249                     ) {
6250                         /* Its not in a cluster */
6251                         if (*endofchain == NULL) {
6252                                 /* lets get a mbuf cluster */
6253                                 if (outchain == NULL) {
6254                                         /* This is the general case */
6255                         new_mbuf:
6256                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6257                                         if (outchain == NULL) {
6258                                                 goto error_out;
6259                                         }
6260                                         SCTP_BUF_LEN(outchain) = 0;
6261                                         *endofchain = outchain;
6262                                         /* get the prepend space */
6263                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6264                                 } else {
6265                                         /*
6266                                          * We really should not get a NULL
6267                                          * in endofchain
6268                                          */
6269                                         /* find end */
6270                                         m = outchain;
6271                                         while (m) {
6272                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6273                                                         *endofchain = m;
6274                                                         break;
6275                                                 }
6276                                                 m = SCTP_BUF_NEXT(m);
6277                                         }
6278                                         /* sanity */
6279                                         if (*endofchain == NULL) {
6280                                                 /*
6281                                                  * huh, TSNH XXX maybe we
6282                                                  * should panic
6283                                                  */
6284                                                 sctp_m_freem(outchain);
6285                                                 goto new_mbuf;
6286                                         }
6287                                 }
6288                                 /* get the new end of length */
6289                                 len = M_TRAILINGSPACE(*endofchain);
6290                         } else {
6291                                 /* how much is left at the end? */
6292                                 len = M_TRAILINGSPACE(*endofchain);
6293                         }
6294                         /* Find the end of the data, for appending */
6295                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6296
6297                         /* Now lets copy it out */
6298                         if (len >= sizeofcpy) {
6299                                 /* It all fits, copy it in */
6300                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6301                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6302                         } else {
6303                                 /* fill up the end of the chain */
6304                                 if (len > 0) {
6305                                         m_copydata(clonechain, 0, len, cp);
6306                                         SCTP_BUF_LEN((*endofchain)) += len;
6307                                         /* now we need another one */
6308                                         sizeofcpy -= len;
6309                                 }
6310                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6311                                 if (m == NULL) {
6312                                         /* We failed */
6313                                         goto error_out;
6314                                 }
6315                                 SCTP_BUF_NEXT((*endofchain)) = m;
6316                                 *endofchain = m;
6317                                 cp = mtod((*endofchain), caddr_t);
6318                                 m_copydata(clonechain, len, sizeofcpy, cp);
6319                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6320                         }
6321                         return (outchain);
6322                 } else {
6323                         /* copy the old fashion way */
6324                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6325 #ifdef SCTP_MBUF_LOGGING
6326                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6327                                 struct mbuf *mat;
6328
6329                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6330                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6331                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6332                                         }
6333                                 }
6334                         }
6335 #endif
6336                 }
6337         }
6338         if (appendchain == NULL) {
6339                 /* error */
6340                 if (outchain)
6341                         sctp_m_freem(outchain);
6342                 return (NULL);
6343         }
6344         if (outchain) {
6345                 /* tack on to the end */
6346                 if (*endofchain != NULL) {
6347                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6348                 } else {
6349                         m = outchain;
6350                         while (m) {
6351                                 if (SCTP_BUF_NEXT(m) == NULL) {
6352                                         SCTP_BUF_NEXT(m) = appendchain;
6353                                         break;
6354                                 }
6355                                 m = SCTP_BUF_NEXT(m);
6356                         }
6357                 }
6358                 /*
6359                  * save off the end and update the end-chain postion
6360                  */
6361                 m = appendchain;
6362                 while (m) {
6363                         if (SCTP_BUF_NEXT(m) == NULL) {
6364                                 *endofchain = m;
6365                                 break;
6366                         }
6367                         m = SCTP_BUF_NEXT(m);
6368                 }
6369                 return (outchain);
6370         } else {
6371                 /* save off the end and update the end-chain postion */
6372                 m = appendchain;
6373                 while (m) {
6374                         if (SCTP_BUF_NEXT(m) == NULL) {
6375                                 *endofchain = m;
6376                                 break;
6377                         }
6378                         m = SCTP_BUF_NEXT(m);
6379                 }
6380                 return (appendchain);
6381         }
6382 }
6383
6384 static int
6385 sctp_med_chunk_output(struct sctp_inpcb *inp,
6386     struct sctp_tcb *stcb,
6387     struct sctp_association *asoc,
6388     int *num_out,
6389     int *reason_code,
6390     int control_only, int from_where,
6391     struct timeval *now, int *now_filled, int frag_point, int so_locked
6392 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6393     SCTP_UNUSED
6394 #endif
6395 );
6396
6397 static void
6398 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6399     uint32_t val SCTP_UNUSED)
6400 {
6401         struct sctp_copy_all *ca;
6402         struct mbuf *m;
6403         int ret = 0;
6404         int added_control = 0;
6405         int un_sent, do_chunk_output = 1;
6406         struct sctp_association *asoc;
6407         struct sctp_nets *net;
6408
6409         ca = (struct sctp_copy_all *)ptr;
6410         if (ca->m == NULL) {
6411                 return;
6412         }
6413         if (ca->inp != inp) {
6414                 /* TSNH */
6415                 return;
6416         }
6417         if ((ca->m) && ca->sndlen) {
6418                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6419                 if (m == NULL) {
6420                         /* can't copy so we are done */
6421                         ca->cnt_failed++;
6422                         return;
6423                 }
6424 #ifdef SCTP_MBUF_LOGGING
6425                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6426                         struct mbuf *mat;
6427
6428                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6429                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6430                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6431                                 }
6432                         }
6433                 }
6434 #endif
6435         } else {
6436                 m = NULL;
6437         }
6438         SCTP_TCB_LOCK_ASSERT(stcb);
6439         if (stcb->asoc.alternate) {
6440                 net = stcb->asoc.alternate;
6441         } else {
6442                 net = stcb->asoc.primary_destination;
6443         }
6444         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6445                 /* Abort this assoc with m as the user defined reason */
6446                 if (m) {
6447                         struct sctp_paramhdr *ph;
6448
6449                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6450                         if (m) {
6451                                 ph = mtod(m, struct sctp_paramhdr *);
6452                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6453                                 ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6454                         }
6455                         /*
6456                          * We add one here to keep the assoc from
6457                          * dis-appearing on us.
6458                          */
6459                         atomic_add_int(&stcb->asoc.refcnt, 1);
6460                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6461                         /*
6462                          * sctp_abort_an_association calls sctp_free_asoc()
6463                          * free association will NOT free it since we
6464                          * incremented the refcnt .. we do this to prevent
6465                          * it being freed and things getting tricky since we
6466                          * could end up (from free_asoc) calling inpcb_free
6467                          * which would get a recursive lock call to the
6468                          * iterator lock.. But as a consequence of that the
6469                          * stcb will return to us un-locked.. since
6470                          * free_asoc returns with either no TCB or the TCB
6471                          * unlocked, we must relock.. to unlock in the
6472                          * iterator timer :-0
6473                          */
6474                         SCTP_TCB_LOCK(stcb);
6475                         atomic_add_int(&stcb->asoc.refcnt, -1);
6476                         goto no_chunk_output;
6477                 }
6478         } else {
6479                 if (m) {
6480                         ret = sctp_msg_append(stcb, net, m,
6481                             &ca->sndrcv, 1);
6482                 }
6483                 asoc = &stcb->asoc;
6484                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6485                         /* shutdown this assoc */
6486                         int cnt;
6487
6488                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6489
6490                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6491                             TAILQ_EMPTY(&asoc->sent_queue) &&
6492                             (cnt == 0)) {
6493                                 if (asoc->locked_on_sending) {
6494                                         goto abort_anyway;
6495                                 }
6496                                 /*
6497                                  * there is nothing queued to send, so I'm
6498                                  * done...
6499                                  */
6500                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6501                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6502                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6503                                         /*
6504                                          * only send SHUTDOWN the first time
6505                                          * through
6506                                          */
6507                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6508                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6509                                         }
6510                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6511                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6512                                         sctp_stop_timers_for_shutdown(stcb);
6513                                         sctp_send_shutdown(stcb, net);
6514                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6515                                             net);
6516                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6517                                             asoc->primary_destination);
6518                                         added_control = 1;
6519                                         do_chunk_output = 0;
6520                                 }
6521                         } else {
6522                                 /*
6523                                  * we still got (or just got) data to send,
6524                                  * so set SHUTDOWN_PENDING
6525                                  */
6526                                 /*
6527                                  * XXX sockets draft says that SCTP_EOF
6528                                  * should be sent with no data.  currently,
6529                                  * we will allow user data to be sent first
6530                                  * and move to SHUTDOWN-PENDING
6531                                  */
6532                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6533                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6534                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6535                                         if (asoc->locked_on_sending) {
6536                                                 /*
6537                                                  * Locked to send out the
6538                                                  * data
6539                                                  */
6540                                                 struct sctp_stream_queue_pending *sp;
6541
6542                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6543                                                 if (sp) {
6544                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6545                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6546                                                 }
6547                                         }
6548                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6549                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6550                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6551                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6552                                 abort_anyway:
6553                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6554                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6555                                                     NULL, SCTP_SO_NOT_LOCKED);
6556                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6557                                                 goto no_chunk_output;
6558                                         }
6559                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6560                                             asoc->primary_destination);
6561                                 }
6562                         }
6563
6564                 }
6565         }
6566         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6567             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6568
6569         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6570             (stcb->asoc.total_flight > 0) &&
6571             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6572             ) {
6573                 do_chunk_output = 0;
6574         }
6575         if (do_chunk_output)
6576                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6577         else if (added_control) {
6578                 int num_out = 0, reason = 0, now_filled = 0;
6579                 struct timeval now;
6580                 int frag_point;
6581
6582                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6583                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6584                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6585         }
6586 no_chunk_output:
6587         if (ret) {
6588                 ca->cnt_failed++;
6589         } else {
6590                 ca->cnt_sent++;
6591         }
6592 }
6593
6594 static void
6595 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6596 {
6597         struct sctp_copy_all *ca;
6598
6599         ca = (struct sctp_copy_all *)ptr;
6600         /*
6601          * Do a notify here? Kacheong suggests that the notify be done at
6602          * the send time.. so you would push up a notification if any send
6603          * failed. Don't know if this is feasable since the only failures we
6604          * have is "memory" related and if you cannot get an mbuf to send
6605          * the data you surely can't get an mbuf to send up to notify the
6606          * user you can't send the data :->
6607          */
6608
6609         /* now free everything */
6610         sctp_m_freem(ca->m);
6611         SCTP_FREE(ca, SCTP_M_COPYAL);
6612 }
6613
6614
6615 #define MC_ALIGN(m, len) do {                                           \
6616         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6617 } while (0)
6618
6619
6620
6621 static struct mbuf *
6622 sctp_copy_out_all(struct uio *uio, int len)
6623 {
6624         struct mbuf *ret, *at;
6625         int left, willcpy, cancpy, error;
6626
6627         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6628         if (ret == NULL) {
6629                 /* TSNH */
6630                 return (NULL);
6631         }
6632         left = len;
6633         SCTP_BUF_LEN(ret) = 0;
6634         /* save space for the data chunk header */
6635         cancpy = M_TRAILINGSPACE(ret);
6636         willcpy = min(cancpy, left);
6637         at = ret;
6638         while (left > 0) {
6639                 /* Align data to the end */
6640                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6641                 if (error) {
6642         err_out_now:
6643                         sctp_m_freem(at);
6644                         return (NULL);
6645                 }
6646                 SCTP_BUF_LEN(at) = willcpy;
6647                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6648                 left -= willcpy;
6649                 if (left > 0) {
6650                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6651                         if (SCTP_BUF_NEXT(at) == NULL) {
6652                                 goto err_out_now;
6653                         }
6654                         at = SCTP_BUF_NEXT(at);
6655                         SCTP_BUF_LEN(at) = 0;
6656                         cancpy = M_TRAILINGSPACE(at);
6657                         willcpy = min(cancpy, left);
6658                 }
6659         }
6660         return (ret);
6661 }
6662
6663 static int
6664 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6665     struct sctp_sndrcvinfo *srcv)
6666 {
6667         int ret;
6668         struct sctp_copy_all *ca;
6669
6670         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6671             SCTP_M_COPYAL);
6672         if (ca == NULL) {
6673                 sctp_m_freem(m);
6674                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6675                 return (ENOMEM);
6676         }
6677         memset(ca, 0, sizeof(struct sctp_copy_all));
6678
6679         ca->inp = inp;
6680         if (srcv) {
6681                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6682         }
6683         /*
6684          * take off the sendall flag, it would be bad if we failed to do
6685          * this :-0
6686          */
6687         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6688         /* get length and mbuf chain */
6689         if (uio) {
6690                 ca->sndlen = uio->uio_resid;
6691                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6692                 if (ca->m == NULL) {
6693                         SCTP_FREE(ca, SCTP_M_COPYAL);
6694                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6695                         return (ENOMEM);
6696                 }
6697         } else {
6698                 /* Gather the length of the send */
6699                 struct mbuf *mat;
6700
6701                 mat = m;
6702                 ca->sndlen = 0;
6703                 while (m) {
6704                         ca->sndlen += SCTP_BUF_LEN(m);
6705                         m = SCTP_BUF_NEXT(m);
6706                 }
6707                 ca->m = mat;
6708         }
6709         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6710             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6711             SCTP_ASOC_ANY_STATE,
6712             (void *)ca, 0,
6713             sctp_sendall_completes, inp, 1);
6714         if (ret) {
6715                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6716                 SCTP_FREE(ca, SCTP_M_COPYAL);
6717                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6718                 return (EFAULT);
6719         }
6720         return (0);
6721 }
6722
6723
6724 void
6725 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6726 {
6727         struct sctp_tmit_chunk *chk, *nchk;
6728
6729         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6730                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6731                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6732                         if (chk->data) {
6733                                 sctp_m_freem(chk->data);
6734                                 chk->data = NULL;
6735                         }
6736                         asoc->ctrl_queue_cnt--;
6737                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6738                 }
6739         }
6740 }
6741
6742 void
6743 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6744 {
6745         struct sctp_association *asoc;
6746         struct sctp_tmit_chunk *chk, *nchk;
6747         struct sctp_asconf_chunk *acp;
6748
6749         asoc = &stcb->asoc;
6750         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6751                 /* find SCTP_ASCONF chunk in queue */
6752                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6753                         if (chk->data) {
6754                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6755                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6756                                         /* Not Acked yet */
6757                                         break;
6758                                 }
6759                         }
6760                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6761                         if (chk->data) {
6762                                 sctp_m_freem(chk->data);
6763                                 chk->data = NULL;
6764                         }
6765                         asoc->ctrl_queue_cnt--;
6766                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6767                 }
6768         }
6769 }
6770
6771
6772 static void
6773 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6774     struct sctp_association *asoc,
6775     struct sctp_tmit_chunk **data_list,
6776     int bundle_at,
6777     struct sctp_nets *net)
6778 {
6779         int i;
6780         struct sctp_tmit_chunk *tp1;
6781
6782         for (i = 0; i < bundle_at; i++) {
6783                 /* off of the send queue */
6784                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6785                 asoc->send_queue_cnt--;
6786                 if (i > 0) {
6787                         /*
6788                          * Any chunk NOT 0 you zap the time chunk 0 gets
6789                          * zapped or set based on if a RTO measurment is
6790                          * needed.
6791                          */
6792                         data_list[i]->do_rtt = 0;
6793                 }
6794                 /* record time */
6795                 data_list[i]->sent_rcv_time = net->last_sent_time;
6796                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6797                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6798                 if (data_list[i]->whoTo == NULL) {
6799                         data_list[i]->whoTo = net;
6800                         atomic_add_int(&net->ref_count, 1);
6801                 }
6802                 /* on to the sent queue */
6803                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6804                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6805                         struct sctp_tmit_chunk *tpp;
6806
6807                         /* need to move back */
6808         back_up_more:
6809                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6810                         if (tpp == NULL) {
6811                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6812                                 goto all_done;
6813                         }
6814                         tp1 = tpp;
6815                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6816                                 goto back_up_more;
6817                         }
6818                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6819                 } else {
6820                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6821                             data_list[i],
6822                             sctp_next);
6823                 }
6824 all_done:
6825                 /* This does not lower until the cum-ack passes it */
6826                 asoc->sent_queue_cnt++;
6827                 if ((asoc->peers_rwnd <= 0) &&
6828                     (asoc->total_flight == 0) &&
6829                     (bundle_at == 1)) {
6830                         /* Mark the chunk as being a window probe */
6831                         SCTP_STAT_INCR(sctps_windowprobed);
6832                 }
6833 #ifdef SCTP_AUDITING_ENABLED
6834                 sctp_audit_log(0xC2, 3);
6835 #endif
6836                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6837                 data_list[i]->snd_count = 1;
6838                 data_list[i]->rec.data.chunk_was_revoked = 0;
6839                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6840                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6841                             data_list[i]->whoTo->flight_size,
6842                             data_list[i]->book_size,
6843                             (uintptr_t) data_list[i]->whoTo,
6844                             data_list[i]->rec.data.TSN_seq);
6845                 }
6846                 sctp_flight_size_increase(data_list[i]);
6847                 sctp_total_flight_increase(stcb, data_list[i]);
6848                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6849                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6850                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6851                 }
6852                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6853                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6854                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6855                         /* SWS sender side engages */
6856                         asoc->peers_rwnd = 0;
6857                 }
6858         }
6859         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6860                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6861         }
6862 }
6863
6864 static void
6865 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6866 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6867     SCTP_UNUSED
6868 #endif
6869 )
6870 {
6871         struct sctp_tmit_chunk *chk, *nchk;
6872
6873         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6874                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6875                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6876                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6877                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6878                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6879                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6880                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6881                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6882                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6883                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6884                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6885                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6886                         /* Stray chunks must be cleaned up */
6887         clean_up_anyway:
6888                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6889                         if (chk->data) {
6890                                 sctp_m_freem(chk->data);
6891                                 chk->data = NULL;
6892                         }
6893                         asoc->ctrl_queue_cnt--;
6894                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6895                                 asoc->fwd_tsn_cnt--;
6896                         sctp_free_a_chunk(stcb, chk, so_locked);
6897                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6898                         /* special handling, we must look into the param */
6899                         if (chk != asoc->str_reset) {
6900                                 goto clean_up_anyway;
6901                         }
6902                 }
6903         }
6904 }
6905
6906
6907 static int
6908 sctp_can_we_split_this(struct sctp_tcb *stcb,
6909     uint32_t length,
6910     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6911 {
6912         /*
6913          * Make a decision on if I should split a msg into multiple parts.
6914          * This is only asked of incomplete messages.
6915          */
6916         if (eeor_on) {
6917                 /*
6918                  * If we are doing EEOR we need to always send it if its the
6919                  * entire thing, since it might be all the guy is putting in
6920                  * the hopper.
6921                  */
6922                 if (goal_mtu >= length) {
6923                         /*-
6924                          * If we have data outstanding,
6925                          * we get another chance when the sack
6926                          * arrives to transmit - wait for more data
6927                          */
6928                         if (stcb->asoc.total_flight == 0) {
6929                                 /*
6930                                  * If nothing is in flight, we zero the
6931                                  * packet counter.
6932                                  */
6933                                 return (length);
6934                         }
6935                         return (0);
6936
6937                 } else {
6938                         /* You can fill the rest */
6939                         return (goal_mtu);
6940                 }
6941         }
6942         /*-
6943          * For those strange folk that make the send buffer
6944          * smaller than our fragmentation point, we can't
6945          * get a full msg in so we have to allow splitting.
6946          */
6947         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6948                 return (length);
6949         }
6950         if ((length <= goal_mtu) ||
6951             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6952                 /* Sub-optimial residual don't split in non-eeor mode. */
6953                 return (0);
6954         }
6955         /*
6956          * If we reach here length is larger than the goal_mtu. Do we wish
6957          * to split it for the sake of packet putting together?
6958          */
6959         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6960                 /* Its ok to split it */
6961                 return (min(goal_mtu, frag_point));
6962         }
6963         /* Nope, can't split */
6964         return (0);
6965
6966 }
6967
6968 static uint32_t
6969 sctp_move_to_outqueue(struct sctp_tcb *stcb,
6970     struct sctp_stream_out *strq,
6971     uint32_t goal_mtu,
6972     uint32_t frag_point,
6973     int *locked,
6974     int *giveup,
6975     int eeor_mode,
6976     int *bail,
6977     int so_locked
6978 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6979     SCTP_UNUSED
6980 #endif
6981 )
6982 {
6983         /* Move from the stream to the send_queue keeping track of the total */
6984         struct sctp_association *asoc;
6985         struct sctp_stream_queue_pending *sp;
6986         struct sctp_tmit_chunk *chk;
6987         struct sctp_data_chunk *dchkh;
6988         uint32_t to_move, length;
6989         uint8_t rcv_flags = 0;
6990         uint8_t some_taken;
6991         uint8_t send_lock_up = 0;
6992
6993         SCTP_TCB_LOCK_ASSERT(stcb);
6994         asoc = &stcb->asoc;
6995 one_more_time:
6996         /* sa_ignore FREED_MEMORY */
6997         sp = TAILQ_FIRST(&strq->outqueue);
6998         if (sp == NULL) {
6999                 *locked = 0;
7000                 if (send_lock_up == 0) {
7001                         SCTP_TCB_SEND_LOCK(stcb);
7002                         send_lock_up = 1;
7003                 }
7004                 sp = TAILQ_FIRST(&strq->outqueue);
7005                 if (sp) {
7006                         goto one_more_time;
7007                 }
7008                 if (strq->last_msg_incomplete) {
7009                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7010                             strq->stream_no,
7011                             strq->last_msg_incomplete);
7012                         strq->last_msg_incomplete = 0;
7013                 }
7014                 to_move = 0;
7015                 if (send_lock_up) {
7016                         SCTP_TCB_SEND_UNLOCK(stcb);
7017                         send_lock_up = 0;
7018                 }
7019                 goto out_of;
7020         }
7021         if ((sp->msg_is_complete) && (sp->length == 0)) {
7022                 if (sp->sender_all_done) {
7023                         /*
7024                          * We are doing differed cleanup. Last time through
7025                          * when we took all the data the sender_all_done was
7026                          * not set.
7027                          */
7028                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7029                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7030                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7031                                     sp->sender_all_done,
7032                                     sp->length,
7033                                     sp->msg_is_complete,
7034                                     sp->put_last_out,
7035                                     send_lock_up);
7036                         }
7037                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7038                                 SCTP_TCB_SEND_LOCK(stcb);
7039                                 send_lock_up = 1;
7040                         }
7041                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7042                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7043                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7044                         if (sp->net) {
7045                                 sctp_free_remote_addr(sp->net);
7046                                 sp->net = NULL;
7047                         }
7048                         if (sp->data) {
7049                                 sctp_m_freem(sp->data);
7050                                 sp->data = NULL;
7051                         }
7052                         sctp_free_a_strmoq(stcb, sp, so_locked);
7053                         /* we can't be locked to it */
7054                         *locked = 0;
7055                         stcb->asoc.locked_on_sending = NULL;
7056                         if (send_lock_up) {
7057                                 SCTP_TCB_SEND_UNLOCK(stcb);
7058                                 send_lock_up = 0;
7059                         }
7060                         /* back to get the next msg */
7061                         goto one_more_time;
7062                 } else {
7063                         /*
7064                          * sender just finished this but still holds a
7065                          * reference
7066                          */
7067                         *locked = 1;
7068                         *giveup = 1;
7069                         to_move = 0;
7070                         goto out_of;
7071                 }
7072         } else {
7073                 /* is there some to get */
7074                 if (sp->length == 0) {
7075                         /* no */
7076                         *locked = 1;
7077                         *giveup = 1;
7078                         to_move = 0;
7079                         goto out_of;
7080                 } else if (sp->discard_rest) {
7081                         if (send_lock_up == 0) {
7082                                 SCTP_TCB_SEND_LOCK(stcb);
7083                                 send_lock_up = 1;
7084                         }
7085                         /* Whack down the size */
7086                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7087                         if ((stcb->sctp_socket != NULL) && \
7088                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7089                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7090                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7091                         }
7092                         if (sp->data) {
7093                                 sctp_m_freem(sp->data);
7094                                 sp->data = NULL;
7095                                 sp->tail_mbuf = NULL;
7096                         }
7097                         sp->length = 0;
7098                         sp->some_taken = 1;
7099                         *locked = 1;
7100                         *giveup = 1;
7101                         to_move = 0;
7102                         goto out_of;
7103                 }
7104         }
7105         some_taken = sp->some_taken;
7106         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7107                 sp->msg_is_complete = 1;
7108         }
7109 re_look:
7110         length = sp->length;
7111         if (sp->msg_is_complete) {
7112                 /* The message is complete */
7113                 to_move = min(length, frag_point);
7114                 if (to_move == length) {
7115                         /* All of it fits in the MTU */
7116                         if (sp->some_taken) {
7117                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7118                                 sp->put_last_out = 1;
7119                         } else {
7120                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7121                                 sp->put_last_out = 1;
7122                         }
7123                 } else {
7124                         /* Not all of it fits, we fragment */
7125                         if (sp->some_taken == 0) {
7126                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7127                         }
7128                         sp->some_taken = 1;
7129                 }
7130         } else {
7131                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7132                 if (to_move) {
7133                         /*-
7134                          * We use a snapshot of length in case it
7135                          * is expanding during the compare.
7136                          */
7137                         uint32_t llen;
7138
7139                         llen = length;
7140                         if (to_move >= llen) {
7141                                 to_move = llen;
7142                                 if (send_lock_up == 0) {
7143                                         /*-
7144                                          * We are taking all of an incomplete msg
7145                                          * thus we need a send lock.
7146                                          */
7147                                         SCTP_TCB_SEND_LOCK(stcb);
7148                                         send_lock_up = 1;
7149                                         if (sp->msg_is_complete) {
7150                                                 /*
7151                                                  * the sender finished the
7152                                                  * msg
7153                                                  */
7154                                                 goto re_look;
7155                                         }
7156                                 }
7157                         }
7158                         if (sp->some_taken == 0) {
7159                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7160                                 sp->some_taken = 1;
7161                         }
7162                 } else {
7163                         /* Nothing to take. */
7164                         if (sp->some_taken) {
7165                                 *locked = 1;
7166                         }
7167                         *giveup = 1;
7168                         to_move = 0;
7169                         goto out_of;
7170                 }
7171         }
7172
7173         /* If we reach here, we can copy out a chunk */
7174         sctp_alloc_a_chunk(stcb, chk);
7175         if (chk == NULL) {
7176                 /* No chunk memory */
7177                 *giveup = 1;
7178                 to_move = 0;
7179                 goto out_of;
7180         }
7181         /*
7182          * Setup for unordered if needed by looking at the user sent info
7183          * flags.
7184          */
7185         if (sp->sinfo_flags & SCTP_UNORDERED) {
7186                 rcv_flags |= SCTP_DATA_UNORDERED;
7187         }
7188         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7189             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7190                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7191         }
7192         /* clear out the chunk before setting up */
7193         memset(chk, 0, sizeof(*chk));
7194         chk->rec.data.rcv_flags = rcv_flags;
7195
7196         if (to_move >= length) {
7197                 /* we think we can steal the whole thing */
7198                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7199                         SCTP_TCB_SEND_LOCK(stcb);
7200                         send_lock_up = 1;
7201                 }
7202                 if (to_move < sp->length) {
7203                         /* bail, it changed */
7204                         goto dont_do_it;
7205                 }
7206                 chk->data = sp->data;
7207                 chk->last_mbuf = sp->tail_mbuf;
7208                 /* register the stealing */
7209                 sp->data = sp->tail_mbuf = NULL;
7210         } else {
7211                 struct mbuf *m;
7212
7213 dont_do_it:
7214                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7215                 chk->last_mbuf = NULL;
7216                 if (chk->data == NULL) {
7217                         sp->some_taken = some_taken;
7218                         sctp_free_a_chunk(stcb, chk, so_locked);
7219                         *bail = 1;
7220                         to_move = 0;
7221                         goto out_of;
7222                 }
7223 #ifdef SCTP_MBUF_LOGGING
7224                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7225                         struct mbuf *mat;
7226
7227                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7228                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7229                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7230                                 }
7231                         }
7232                 }
7233 #endif
7234                 /* Pull off the data */
7235                 m_adj(sp->data, to_move);
7236                 /* Now lets work our way down and compact it */
7237                 m = sp->data;
7238                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7239                         sp->data = SCTP_BUF_NEXT(m);
7240                         SCTP_BUF_NEXT(m) = NULL;
7241                         if (sp->tail_mbuf == m) {
7242                                 /*-
7243                                  * Freeing tail? TSNH since
7244                                  * we supposedly were taking less
7245                                  * than the sp->length.
7246                                  */
7247 #ifdef INVARIANTS
7248                                 panic("Huh, freing tail? - TSNH");
7249 #else
7250                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7251                                 sp->tail_mbuf = sp->data = NULL;
7252                                 sp->length = 0;
7253 #endif
7254
7255                         }
7256                         sctp_m_free(m);
7257                         m = sp->data;
7258                 }
7259         }
7260         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7261                 chk->copy_by_ref = 1;
7262         } else {
7263                 chk->copy_by_ref = 0;
7264         }
7265         /*
7266          * get last_mbuf and counts of mb useage This is ugly but hopefully
7267          * its only one mbuf.
7268          */
7269         if (chk->last_mbuf == NULL) {
7270                 chk->last_mbuf = chk->data;
7271                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7272                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7273                 }
7274         }
7275         if (to_move > length) {
7276                 /*- This should not happen either
7277                  * since we always lower to_move to the size
7278                  * of sp->length if its larger.
7279                  */
7280 #ifdef INVARIANTS
7281                 panic("Huh, how can to_move be larger?");
7282 #else
7283                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7284                 sp->length = 0;
7285 #endif
7286         } else {
7287                 atomic_subtract_int(&sp->length, to_move);
7288         }
7289         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7290                 /* Not enough room for a chunk header, get some */
7291                 struct mbuf *m;
7292
7293                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7294                 if (m == NULL) {
7295                         /*
7296                          * we're in trouble here. _PREPEND below will free
7297                          * all the data if there is no leading space, so we
7298                          * must put the data back and restore.
7299                          */
7300                         if (send_lock_up == 0) {
7301                                 SCTP_TCB_SEND_LOCK(stcb);
7302                                 send_lock_up = 1;
7303                         }
7304                         if (chk->data == NULL) {
7305                                 /* unsteal the data */
7306                                 sp->data = chk->data;
7307                                 sp->tail_mbuf = chk->last_mbuf;
7308                         } else {
7309                                 struct mbuf *m_tmp;
7310
7311                                 /* reassemble the data */
7312                                 m_tmp = sp->data;
7313                                 sp->data = chk->data;
7314                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7315                         }
7316                         sp->some_taken = some_taken;
7317                         atomic_add_int(&sp->length, to_move);
7318                         chk->data = NULL;
7319                         *bail = 1;
7320                         sctp_free_a_chunk(stcb, chk, so_locked);
7321                         to_move = 0;
7322                         goto out_of;
7323                 } else {
7324                         SCTP_BUF_LEN(m) = 0;
7325                         SCTP_BUF_NEXT(m) = chk->data;
7326                         chk->data = m;
7327                         M_ALIGN(chk->data, 4);
7328                 }
7329         }
7330         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7331         if (chk->data == NULL) {
7332                 /* HELP, TSNH since we assured it would not above? */
7333 #ifdef INVARIANTS
7334                 panic("prepend failes HELP?");
7335 #else
7336                 SCTP_PRINTF("prepend fails HELP?\n");
7337                 sctp_free_a_chunk(stcb, chk, so_locked);
7338 #endif
7339                 *bail = 1;
7340                 to_move = 0;
7341                 goto out_of;
7342         }
7343         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7344         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7345         chk->book_size_scale = 0;
7346         chk->sent = SCTP_DATAGRAM_UNSENT;
7347
7348         chk->flags = 0;
7349         chk->asoc = &stcb->asoc;
7350         chk->pad_inplace = 0;
7351         chk->no_fr_allowed = 0;
7352         chk->rec.data.stream_seq = strq->next_sequence_send;
7353         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7354                 strq->next_sequence_send++;
7355         }
7356         chk->rec.data.stream_number = sp->stream;
7357         chk->rec.data.payloadtype = sp->ppid;
7358         chk->rec.data.context = sp->context;
7359         chk->rec.data.doing_fast_retransmit = 0;
7360
7361         chk->rec.data.timetodrop = sp->ts;
7362         chk->flags = sp->act_flags;
7363
7364         if (sp->net) {
7365                 chk->whoTo = sp->net;
7366                 atomic_add_int(&chk->whoTo->ref_count, 1);
7367         } else
7368                 chk->whoTo = NULL;
7369
7370         if (sp->holds_key_ref) {
7371                 chk->auth_keyid = sp->auth_keyid;
7372                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7373                 chk->holds_key_ref = 1;
7374         }
7375         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7376         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7377                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7378                     (uintptr_t) stcb, sp->length,
7379                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7380                     chk->rec.data.TSN_seq);
7381         }
7382         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7383         /*
7384          * Put the rest of the things in place now. Size was done earlier in
7385          * previous loop prior to padding.
7386          */
7387
7388 #ifdef SCTP_ASOCLOG_OF_TSNS
7389         SCTP_TCB_LOCK_ASSERT(stcb);
7390         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7391                 asoc->tsn_out_at = 0;
7392                 asoc->tsn_out_wrapped = 1;
7393         }
7394         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7395         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7396         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7397         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7398         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7399         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7400         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7401         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7402         asoc->tsn_out_at++;
7403 #endif
7404
7405         dchkh->ch.chunk_type = SCTP_DATA;
7406         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7407         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7408         dchkh->dp.stream_id = htons(strq->stream_no);
7409         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7410         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7411         dchkh->ch.chunk_length = htons(chk->send_size);
7412         /* Now advance the chk->send_size by the actual pad needed. */
7413         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7414                 /* need a pad */
7415                 struct mbuf *lm;
7416                 int pads;
7417
7418                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7419                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7420                         chk->pad_inplace = 1;
7421                 }
7422                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7423                         /* pad added an mbuf */
7424                         chk->last_mbuf = lm;
7425                 }
7426                 chk->send_size += pads;
7427         }
7428         /* We only re-set the policy if it is on */
7429         if (sp->pr_sctp_on) {
7430                 sctp_set_prsctp_policy(sp);
7431                 asoc->pr_sctp_cnt++;
7432                 chk->pr_sctp_on = 1;
7433         } else {
7434                 chk->pr_sctp_on = 0;
7435         }
7436         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7437                 /* All done pull and kill the message */
7438                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7439                 if (sp->put_last_out == 0) {
7440                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7441                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7442                             sp->sender_all_done,
7443                             sp->length,
7444                             sp->msg_is_complete,
7445                             sp->put_last_out,
7446                             send_lock_up);
7447                 }
7448                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7449                         SCTP_TCB_SEND_LOCK(stcb);
7450                         send_lock_up = 1;
7451                 }
7452                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7453                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7454                 if (sp->net) {
7455                         sctp_free_remote_addr(sp->net);
7456                         sp->net = NULL;
7457                 }
7458                 if (sp->data) {
7459                         sctp_m_freem(sp->data);
7460                         sp->data = NULL;
7461                 }
7462                 sctp_free_a_strmoq(stcb, sp, so_locked);
7463
7464                 /* we can't be locked to it */
7465                 *locked = 0;
7466                 stcb->asoc.locked_on_sending = NULL;
7467         } else {
7468                 /* more to go, we are locked */
7469                 *locked = 1;
7470         }
7471         asoc->chunks_on_out_queue++;
7472         strq->chunks_on_queues++;
7473         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7474         asoc->send_queue_cnt++;
7475 out_of:
7476         if (send_lock_up) {
7477                 SCTP_TCB_SEND_UNLOCK(stcb);
7478         }
7479         return (to_move);
7480 }
7481
7482
7483 static void
7484 sctp_fill_outqueue(struct sctp_tcb *stcb,
7485     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7486 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7487     SCTP_UNUSED
7488 #endif
7489 )
7490 {
7491         struct sctp_association *asoc;
7492         struct sctp_stream_out *strq;
7493         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7494         int locked, giveup;
7495
7496         SCTP_TCB_LOCK_ASSERT(stcb);
7497         asoc = &stcb->asoc;
7498         switch (net->ro._l_addr.sa.sa_family) {
7499 #ifdef INET
7500         case AF_INET:
7501                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7502                 break;
7503 #endif
7504 #ifdef INET6
7505         case AF_INET6:
7506                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7507                 break;
7508 #endif
7509         default:
7510                 /* TSNH */
7511                 goal_mtu = net->mtu;
7512                 break;
7513         }
7514         /* Need an allowance for the data chunk header too */
7515         goal_mtu -= sizeof(struct sctp_data_chunk);
7516
7517         /* must make even word boundary */
7518         goal_mtu &= 0xfffffffc;
7519         if (asoc->locked_on_sending) {
7520                 /* We are stuck on one stream until the message completes. */
7521                 strq = asoc->locked_on_sending;
7522                 locked = 1;
7523         } else {
7524                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7525                 locked = 0;
7526         }
7527         while ((goal_mtu > 0) && strq) {
7528                 giveup = 0;
7529                 bail = 0;
7530                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7531                     &giveup, eeor_mode, &bail, so_locked);
7532                 if (moved_how_much)
7533                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7534
7535                 if (locked) {
7536                         asoc->locked_on_sending = strq;
7537                         if ((moved_how_much == 0) || (giveup) || bail)
7538                                 /* no more to move for now */
7539                                 break;
7540                 } else {
7541                         asoc->locked_on_sending = NULL;
7542                         if ((giveup) || bail) {
7543                                 break;
7544                         }
7545                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7546                         if (strq == NULL) {
7547                                 break;
7548                         }
7549                 }
7550                 total_moved += moved_how_much;
7551                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7552                 goal_mtu &= 0xfffffffc;
7553         }
7554         if (bail)
7555                 *quit_now = 1;
7556
7557         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7558
7559         if (total_moved == 0) {
7560                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7561                     (net == stcb->asoc.primary_destination)) {
7562                         /* ran dry for primary network net */
7563                         SCTP_STAT_INCR(sctps_primary_randry);
7564                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7565                         /* ran dry with CMT on */
7566                         SCTP_STAT_INCR(sctps_cmt_randry);
7567                 }
7568         }
7569 }
7570
7571 void
7572 sctp_fix_ecn_echo(struct sctp_association *asoc)
7573 {
7574         struct sctp_tmit_chunk *chk;
7575
7576         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7577                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7578                         chk->sent = SCTP_DATAGRAM_UNSENT;
7579                 }
7580         }
7581 }
7582
7583 void
7584 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7585 {
7586         struct sctp_association *asoc;
7587         struct sctp_tmit_chunk *chk;
7588         struct sctp_stream_queue_pending *sp;
7589         unsigned int i;
7590
7591         if (net == NULL) {
7592                 return;
7593         }
7594         asoc = &stcb->asoc;
7595         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7596                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7597                         if (sp->net == net) {
7598                                 sctp_free_remote_addr(sp->net);
7599                                 sp->net = NULL;
7600                         }
7601                 }
7602         }
7603         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7604                 if (chk->whoTo == net) {
7605                         sctp_free_remote_addr(chk->whoTo);
7606                         chk->whoTo = NULL;
7607                 }
7608         }
7609 }
7610
7611 int
7612 sctp_med_chunk_output(struct sctp_inpcb *inp,
7613     struct sctp_tcb *stcb,
7614     struct sctp_association *asoc,
7615     int *num_out,
7616     int *reason_code,
7617     int control_only, int from_where,
7618     struct timeval *now, int *now_filled, int frag_point, int so_locked
7619 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7620     SCTP_UNUSED
7621 #endif
7622 )
7623 {
7624         /*
7625          * Ok this is the generic chunk service queue. we must do the
7626          * following: - Service the stream queue that is next, moving any
7627          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7628          * LAST to the out queue in one pass) and assigning TSN's - Check to
7629          * see if the cwnd/rwnd allows any output, if so we go ahead and
7630          * fomulate and send the low level chunks. Making sure to combine
7631          * any control in the control chunk queue also.
7632          */
7633         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7634         struct mbuf *outchain, *endoutchain;
7635         struct sctp_tmit_chunk *chk, *nchk;
7636
7637         /* temp arrays for unlinking */
7638         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7639         int no_fragmentflg, error;
7640         unsigned int max_rwnd_per_dest, max_send_per_dest;
7641         int one_chunk, hbflag, skip_data_for_this_net;
7642         int asconf, cookie, no_out_cnt;
7643         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7644         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7645         int tsns_sent = 0;
7646         uint32_t auth_offset = 0;
7647         struct sctp_auth_chunk *auth = NULL;
7648         uint16_t auth_keyid;
7649         int override_ok = 1;
7650         int skip_fill_up = 0;
7651         int data_auth_reqd = 0;
7652
7653         /*
7654          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7655          * destination.
7656          */
7657         int quit_now = 0;
7658
7659         *num_out = 0;
7660         auth_keyid = stcb->asoc.authinfo.active_keyid;
7661
7662         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7663             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7664             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7665                 eeor_mode = 1;
7666         } else {
7667                 eeor_mode = 0;
7668         }
7669         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7670         /*
7671          * First lets prime the pump. For each destination, if there is room
7672          * in the flight size, attempt to pull an MTU's worth out of the
7673          * stream queues into the general send_queue
7674          */
7675 #ifdef SCTP_AUDITING_ENABLED
7676         sctp_audit_log(0xC2, 2);
7677 #endif
7678         SCTP_TCB_LOCK_ASSERT(stcb);
7679         hbflag = 0;
7680         if ((control_only) || (asoc->stream_reset_outstanding))
7681                 no_data_chunks = 1;
7682         else
7683                 no_data_chunks = 0;
7684
7685         /* Nothing to possible to send? */
7686         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7687             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7688             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7689             TAILQ_EMPTY(&asoc->send_queue) &&
7690             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7691 nothing_to_send:
7692                 *reason_code = 9;
7693                 return (0);
7694         }
7695         if (asoc->peers_rwnd == 0) {
7696                 /* No room in peers rwnd */
7697                 *reason_code = 1;
7698                 if (asoc->total_flight > 0) {
7699                         /* we are allowed one chunk in flight */
7700                         no_data_chunks = 1;
7701                 }
7702         }
7703         if (stcb->asoc.ecn_echo_cnt_onq) {
7704                 /* Record where a sack goes, if any */
7705                 if (no_data_chunks &&
7706                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7707                         /* Nothing but ECNe to send - we don't do that */
7708                         goto nothing_to_send;
7709                 }
7710                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7711                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7712                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7713                                 sack_goes_to = chk->whoTo;
7714                                 break;
7715                         }
7716                 }
7717         }
7718         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7719         if (stcb->sctp_socket)
7720                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7721         else
7722                 max_send_per_dest = 0;
7723         if (no_data_chunks == 0) {
7724                 /* How many non-directed chunks are there? */
7725                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7726                         if (chk->whoTo == NULL) {
7727                                 /*
7728                                  * We already have non-directed chunks on
7729                                  * the queue, no need to do a fill-up.
7730                                  */
7731                                 skip_fill_up = 1;
7732                                 break;
7733                         }
7734                 }
7735
7736         }
7737         if ((no_data_chunks == 0) &&
7738             (skip_fill_up == 0) &&
7739             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7740                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7741                         /*
7742                          * This for loop we are in takes in each net, if
7743                          * its's got space in cwnd and has data sent to it
7744                          * (when CMT is off) then it calls
7745                          * sctp_fill_outqueue for the net. This gets data on
7746                          * the send queue for that network.
7747                          *
7748                          * In sctp_fill_outqueue TSN's are assigned and data is
7749                          * copied out of the stream buffers. Note mostly
7750                          * copy by reference (we hope).
7751                          */
7752                         net->window_probe = 0;
7753                         if ((net != stcb->asoc.alternate) &&
7754                             ((net->dest_state & SCTP_ADDR_PF) ||
7755                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7756                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7757                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7758                                         sctp_log_cwnd(stcb, net, 1,
7759                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7760                                 }
7761                                 continue;
7762                         }
7763                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7764                             (net->flight_size == 0)) {
7765                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7766                         }
7767                         if (net->flight_size >= net->cwnd) {
7768                                 /* skip this network, no room - can't fill */
7769                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7770                                         sctp_log_cwnd(stcb, net, 3,
7771                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7772                                 }
7773                                 continue;
7774                         }
7775                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7776                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7777                         }
7778                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7779                         if (quit_now) {
7780                                 /* memory alloc failure */
7781                                 no_data_chunks = 1;
7782                                 break;
7783                         }
7784                 }
7785         }
7786         /* now service each destination and send out what we can for it */
7787         /* Nothing to send? */
7788         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7789             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7790             TAILQ_EMPTY(&asoc->send_queue)) {
7791                 *reason_code = 8;
7792                 return (0);
7793         }
7794         if (asoc->sctp_cmt_on_off > 0) {
7795                 /* get the last start point */
7796                 start_at = asoc->last_net_cmt_send_started;
7797                 if (start_at == NULL) {
7798                         /* null so to beginning */
7799                         start_at = TAILQ_FIRST(&asoc->nets);
7800                 } else {
7801                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7802                         if (start_at == NULL) {
7803                                 start_at = TAILQ_FIRST(&asoc->nets);
7804                         }
7805                 }
7806                 asoc->last_net_cmt_send_started = start_at;
7807         } else {
7808                 start_at = TAILQ_FIRST(&asoc->nets);
7809         }
7810         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7811                 if (chk->whoTo == NULL) {
7812                         if (asoc->alternate) {
7813                                 chk->whoTo = asoc->alternate;
7814                         } else {
7815                                 chk->whoTo = asoc->primary_destination;
7816                         }
7817                         atomic_add_int(&chk->whoTo->ref_count, 1);
7818                 }
7819         }
7820         old_start_at = NULL;
7821 again_one_more_time:
7822         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7823                 /* how much can we send? */
7824                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7825                 if (old_start_at && (old_start_at == net)) {
7826                         /* through list ocmpletely. */
7827                         break;
7828                 }
7829                 tsns_sent = 0xa;
7830                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7831                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7832                     (net->flight_size >= net->cwnd)) {
7833                         /*
7834                          * Nothing on control or asconf and flight is full,
7835                          * we can skip even in the CMT case.
7836                          */
7837                         continue;
7838                 }
7839                 bundle_at = 0;
7840                 endoutchain = outchain = NULL;
7841                 no_fragmentflg = 1;
7842                 one_chunk = 0;
7843                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7844                         skip_data_for_this_net = 1;
7845                 } else {
7846                         skip_data_for_this_net = 0;
7847                 }
7848                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7849                         /*
7850                          * if we have a route and an ifp check to see if we
7851                          * have room to send to this guy
7852                          */
7853                         struct ifnet *ifp;
7854
7855                         ifp = net->ro.ro_rt->rt_ifp;
7856                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7857                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7858                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7859                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7860                                 }
7861                                 continue;
7862                         }
7863                 }
7864                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7865 #ifdef INET
7866                 case AF_INET:
7867                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7868                         break;
7869 #endif
7870 #ifdef INET6
7871                 case AF_INET6:
7872                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7873                         break;
7874 #endif
7875                 default:
7876                         /* TSNH */
7877                         mtu = net->mtu;
7878                         break;
7879                 }
7880                 mx_mtu = mtu;
7881                 to_out = 0;
7882                 if (mtu > asoc->peers_rwnd) {
7883                         if (asoc->total_flight > 0) {
7884                                 /* We have a packet in flight somewhere */
7885                                 r_mtu = asoc->peers_rwnd;
7886                         } else {
7887                                 /* We are always allowed to send one MTU out */
7888                                 one_chunk = 1;
7889                                 r_mtu = mtu;
7890                         }
7891                 } else {
7892                         r_mtu = mtu;
7893                 }
7894                 /************************/
7895                 /* ASCONF transmission */
7896                 /************************/
7897                 /* Now first lets go through the asconf queue */
7898                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7899                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7900                                 continue;
7901                         }
7902                         if (chk->whoTo == NULL) {
7903                                 if (asoc->alternate == NULL) {
7904                                         if (asoc->primary_destination != net) {
7905                                                 break;
7906                                         }
7907                                 } else {
7908                                         if (asoc->alternate != net) {
7909                                                 break;
7910                                         }
7911                                 }
7912                         } else {
7913                                 if (chk->whoTo != net) {
7914                                         break;
7915                                 }
7916                         }
7917                         if (chk->data == NULL) {
7918                                 break;
7919                         }
7920                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7921                             chk->sent != SCTP_DATAGRAM_RESEND) {
7922                                 break;
7923                         }
7924                         /*
7925                          * if no AUTH is yet included and this chunk
7926                          * requires it, make sure to account for it.  We
7927                          * don't apply the size until the AUTH chunk is
7928                          * actually added below in case there is no room for
7929                          * this chunk. NOTE: we overload the use of "omtu"
7930                          * here
7931                          */
7932                         if ((auth == NULL) &&
7933                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7934                             stcb->asoc.peer_auth_chunks)) {
7935                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7936                         } else
7937                                 omtu = 0;
7938                         /* Here we do NOT factor the r_mtu */
7939                         if ((chk->send_size < (int)(mtu - omtu)) ||
7940                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7941                                 /*
7942                                  * We probably should glom the mbuf chain
7943                                  * from the chk->data for control but the
7944                                  * problem is it becomes yet one more level
7945                                  * of tracking to do if for some reason
7946                                  * output fails. Then I have got to
7947                                  * reconstruct the merged control chain.. el
7948                                  * yucko.. for now we take the easy way and
7949                                  * do the copy
7950                                  */
7951                                 /*
7952                                  * Add an AUTH chunk, if chunk requires it
7953                                  * save the offset into the chain for AUTH
7954                                  */
7955                                 if ((auth == NULL) &&
7956                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7957                                     stcb->asoc.peer_auth_chunks))) {
7958                                         outchain = sctp_add_auth_chunk(outchain,
7959                                             &endoutchain,
7960                                             &auth,
7961                                             &auth_offset,
7962                                             stcb,
7963                                             chk->rec.chunk_id.id);
7964                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7965                                 }
7966                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7967                                     (int)chk->rec.chunk_id.can_take_data,
7968                                     chk->send_size, chk->copy_by_ref);
7969                                 if (outchain == NULL) {
7970                                         *reason_code = 8;
7971                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7972                                         return (ENOMEM);
7973                                 }
7974                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7975                                 /* update our MTU size */
7976                                 if (mtu > (chk->send_size + omtu))
7977                                         mtu -= (chk->send_size + omtu);
7978                                 else
7979                                         mtu = 0;
7980                                 to_out += (chk->send_size + omtu);
7981                                 /* Do clear IP_DF ? */
7982                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7983                                         no_fragmentflg = 0;
7984                                 }
7985                                 if (chk->rec.chunk_id.can_take_data)
7986                                         chk->data = NULL;
7987                                 /*
7988                                  * set hb flag since we can use these for
7989                                  * RTO
7990                                  */
7991                                 hbflag = 1;
7992                                 asconf = 1;
7993                                 /*
7994                                  * should sysctl this: don't bundle data
7995                                  * with ASCONF since it requires AUTH
7996                                  */
7997                                 no_data_chunks = 1;
7998                                 chk->sent = SCTP_DATAGRAM_SENT;
7999                                 if (chk->whoTo == NULL) {
8000                                         chk->whoTo = net;
8001                                         atomic_add_int(&net->ref_count, 1);
8002                                 }
8003                                 chk->snd_count++;
8004                                 if (mtu == 0) {
8005                                         /*
8006                                          * Ok we are out of room but we can
8007                                          * output without effecting the
8008                                          * flight size since this little guy
8009                                          * is a control only packet.
8010                                          */
8011                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8012                                         /*
8013                                          * do NOT clear the asconf flag as
8014                                          * it is used to do appropriate
8015                                          * source address selection.
8016                                          */
8017                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8018                                             (struct sockaddr *)&net->ro._l_addr,
8019                                             outchain, auth_offset, auth,
8020                                             stcb->asoc.authinfo.active_keyid,
8021                                             no_fragmentflg, 0, asconf,
8022                                             inp->sctp_lport, stcb->rport,
8023                                             htonl(stcb->asoc.peer_vtag),
8024                                             net->port, NULL,
8025                                             0, 0,
8026                                             so_locked))) {
8027                                                 if (error == ENOBUFS) {
8028                                                         asoc->ifp_had_enobuf = 1;
8029                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8030                                                 }
8031                                                 if (from_where == 0) {
8032                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8033                                                 }
8034                                                 if (*now_filled == 0) {
8035                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8036                                                         *now_filled = 1;
8037                                                         *now = net->last_sent_time;
8038                                                 } else {
8039                                                         net->last_sent_time = *now;
8040                                                 }
8041                                                 hbflag = 0;
8042                                                 /* error, could not output */
8043                                                 if (error == EHOSTUNREACH) {
8044                                                         /*
8045                                                          * Destination went
8046                                                          * unreachable
8047                                                          * during this send
8048                                                          */
8049                                                         sctp_move_chunks_from_net(stcb, net);
8050                                                 }
8051                                                 *reason_code = 7;
8052                                                 continue;
8053                                         } else
8054                                                 asoc->ifp_had_enobuf = 0;
8055                                         if (*now_filled == 0) {
8056                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8057                                                 *now_filled = 1;
8058                                                 *now = net->last_sent_time;
8059                                         } else {
8060                                                 net->last_sent_time = *now;
8061                                         }
8062                                         hbflag = 0;
8063                                         /*
8064                                          * increase the number we sent, if a
8065                                          * cookie is sent we don't tell them
8066                                          * any was sent out.
8067                                          */
8068                                         outchain = endoutchain = NULL;
8069                                         auth = NULL;
8070                                         auth_offset = 0;
8071                                         if (!no_out_cnt)
8072                                                 *num_out += ctl_cnt;
8073                                         /* recalc a clean slate and setup */
8074                                         switch (net->ro._l_addr.sa.sa_family) {
8075 #ifdef INET
8076                                         case AF_INET:
8077                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8078                                                 break;
8079 #endif
8080 #ifdef INET6
8081                                         case AF_INET6:
8082                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8083                                                 break;
8084 #endif
8085                                         default:
8086                                                 /* TSNH */
8087                                                 mtu = net->mtu;
8088                                                 break;
8089                                         }
8090                                         to_out = 0;
8091                                         no_fragmentflg = 1;
8092                                 }
8093                         }
8094                 }
8095                 /************************/
8096                 /* Control transmission */
8097                 /************************/
8098                 /* Now first lets go through the control queue */
8099                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8100                         if ((sack_goes_to) &&
8101                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8102                             (chk->whoTo != sack_goes_to)) {
8103                                 /*
8104                                  * if we have a sack in queue, and we are
8105                                  * looking at an ecn echo that is NOT queued
8106                                  * to where the sack is going..
8107                                  */
8108                                 if (chk->whoTo == net) {
8109                                         /*
8110                                          * Don't transmit it to where its
8111                                          * going (current net)
8112                                          */
8113                                         continue;
8114                                 } else if (sack_goes_to == net) {
8115                                         /*
8116                                          * But do transmit it to this
8117                                          * address
8118                                          */
8119                                         goto skip_net_check;
8120                                 }
8121                         }
8122                         if (chk->whoTo == NULL) {
8123                                 if (asoc->alternate == NULL) {
8124                                         if (asoc->primary_destination != net) {
8125                                                 continue;
8126                                         }
8127                                 } else {
8128                                         if (asoc->alternate != net) {
8129                                                 continue;
8130                                         }
8131                                 }
8132                         } else {
8133                                 if (chk->whoTo != net) {
8134                                         continue;
8135                                 }
8136                         }
8137         skip_net_check:
8138                         if (chk->data == NULL) {
8139                                 continue;
8140                         }
8141                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8142                                 /*
8143                                  * It must be unsent. Cookies and ASCONF's
8144                                  * hang around but there timers will force
8145                                  * when marked for resend.
8146                                  */
8147                                 continue;
8148                         }
8149                         /*
8150                          * if no AUTH is yet included and this chunk
8151                          * requires it, make sure to account for it.  We
8152                          * don't apply the size until the AUTH chunk is
8153                          * actually added below in case there is no room for
8154                          * this chunk. NOTE: we overload the use of "omtu"
8155                          * here
8156                          */
8157                         if ((auth == NULL) &&
8158                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8159                             stcb->asoc.peer_auth_chunks)) {
8160                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8161                         } else
8162                                 omtu = 0;
8163                         /* Here we do NOT factor the r_mtu */
8164                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8165                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8166                                 /*
8167                                  * We probably should glom the mbuf chain
8168                                  * from the chk->data for control but the
8169                                  * problem is it becomes yet one more level
8170                                  * of tracking to do if for some reason
8171                                  * output fails. Then I have got to
8172                                  * reconstruct the merged control chain.. el
8173                                  * yucko.. for now we take the easy way and
8174                                  * do the copy
8175                                  */
8176                                 /*
8177                                  * Add an AUTH chunk, if chunk requires it
8178                                  * save the offset into the chain for AUTH
8179                                  */
8180                                 if ((auth == NULL) &&
8181                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8182                                     stcb->asoc.peer_auth_chunks))) {
8183                                         outchain = sctp_add_auth_chunk(outchain,
8184                                             &endoutchain,
8185                                             &auth,
8186                                             &auth_offset,
8187                                             stcb,
8188                                             chk->rec.chunk_id.id);
8189                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8190                                 }
8191                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8192                                     (int)chk->rec.chunk_id.can_take_data,
8193                                     chk->send_size, chk->copy_by_ref);
8194                                 if (outchain == NULL) {
8195                                         *reason_code = 8;
8196                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8197                                         return (ENOMEM);
8198                                 }
8199                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8200                                 /* update our MTU size */
8201                                 if (mtu > (chk->send_size + omtu))
8202                                         mtu -= (chk->send_size + omtu);
8203                                 else
8204                                         mtu = 0;
8205                                 to_out += (chk->send_size + omtu);
8206                                 /* Do clear IP_DF ? */
8207                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8208                                         no_fragmentflg = 0;
8209                                 }
8210                                 if (chk->rec.chunk_id.can_take_data)
8211                                         chk->data = NULL;
8212                                 /* Mark things to be removed, if needed */
8213                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8214                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8215                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8216                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8217                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8218                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8219                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8220                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8221                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8222                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8223                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8224                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8225                                                 hbflag = 1;
8226                                         }
8227                                         /* remove these chunks at the end */
8228                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8229                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8230                                                 /* turn off the timer */
8231                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8232                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8233                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8234                                                 }
8235                                         }
8236                                         ctl_cnt++;
8237                                 } else {
8238                                         /*
8239                                          * Other chunks, since they have
8240                                          * timers running (i.e. COOKIE) we
8241                                          * just "trust" that it gets sent or
8242                                          * retransmitted.
8243                                          */
8244                                         ctl_cnt++;
8245                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8246                                                 cookie = 1;
8247                                                 no_out_cnt = 1;
8248                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8249                                                 /*
8250                                                  * Increment ecne send count
8251                                                  * here this means we may be
8252                                                  * over-zealous in our
8253                                                  * counting if the send
8254                                                  * fails, but its the best
8255                                                  * place to do it (we used
8256                                                  * to do it in the queue of
8257                                                  * the chunk, but that did
8258                                                  * not tell how many times
8259                                                  * it was sent.
8260                                                  */
8261                                                 SCTP_STAT_INCR(sctps_sendecne);
8262                                         }
8263                                         chk->sent = SCTP_DATAGRAM_SENT;
8264                                         if (chk->whoTo == NULL) {
8265                                                 chk->whoTo = net;
8266                                                 atomic_add_int(&net->ref_count, 1);
8267                                         }
8268                                         chk->snd_count++;
8269                                 }
8270                                 if (mtu == 0) {
8271                                         /*
8272                                          * Ok we are out of room but we can
8273                                          * output without effecting the
8274                                          * flight size since this little guy
8275                                          * is a control only packet.
8276                                          */
8277                                         if (asconf) {
8278                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8279                                                 /*
8280                                                  * do NOT clear the asconf
8281                                                  * flag as it is used to do
8282                                                  * appropriate source
8283                                                  * address selection.
8284                                                  */
8285                                         }
8286                                         if (cookie) {
8287                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8288                                                 cookie = 0;
8289                                         }
8290                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8291                                             (struct sockaddr *)&net->ro._l_addr,
8292                                             outchain,
8293                                             auth_offset, auth,
8294                                             stcb->asoc.authinfo.active_keyid,
8295                                             no_fragmentflg, 0, asconf,
8296                                             inp->sctp_lport, stcb->rport,
8297                                             htonl(stcb->asoc.peer_vtag),
8298                                             net->port, NULL,
8299                                             0, 0,
8300                                             so_locked))) {
8301                                                 if (error == ENOBUFS) {
8302                                                         asoc->ifp_had_enobuf = 1;
8303                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8304                                                 }
8305                                                 if (from_where == 0) {
8306                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8307                                                 }
8308                                                 /* error, could not output */
8309                                                 if (hbflag) {
8310                                                         if (*now_filled == 0) {
8311                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8312                                                                 *now_filled = 1;
8313                                                                 *now = net->last_sent_time;
8314                                                         } else {
8315                                                                 net->last_sent_time = *now;
8316                                                         }
8317                                                         hbflag = 0;
8318                                                 }
8319                                                 if (error == EHOSTUNREACH) {
8320                                                         /*
8321                                                          * Destination went
8322                                                          * unreachable
8323                                                          * during this send
8324                                                          */
8325                                                         sctp_move_chunks_from_net(stcb, net);
8326                                                 }
8327                                                 *reason_code = 7;
8328                                                 continue;
8329                                         } else
8330                                                 asoc->ifp_had_enobuf = 0;
8331                                         /* Only HB or ASCONF advances time */
8332                                         if (hbflag) {
8333                                                 if (*now_filled == 0) {
8334                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8335                                                         *now_filled = 1;
8336                                                         *now = net->last_sent_time;
8337                                                 } else {
8338                                                         net->last_sent_time = *now;
8339                                                 }
8340                                                 hbflag = 0;
8341                                         }
8342                                         /*
8343                                          * increase the number we sent, if a
8344                                          * cookie is sent we don't tell them
8345                                          * any was sent out.
8346                                          */
8347                                         outchain = endoutchain = NULL;
8348                                         auth = NULL;
8349                                         auth_offset = 0;
8350                                         if (!no_out_cnt)
8351                                                 *num_out += ctl_cnt;
8352                                         /* recalc a clean slate and setup */
8353                                         switch (net->ro._l_addr.sa.sa_family) {
8354 #ifdef INET
8355                                         case AF_INET:
8356                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8357                                                 break;
8358 #endif
8359 #ifdef INET6
8360                                         case AF_INET6:
8361                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8362                                                 break;
8363 #endif
8364                                         default:
8365                                                 /* TSNH */
8366                                                 mtu = net->mtu;
8367                                                 break;
8368                                         }
8369                                         to_out = 0;
8370                                         no_fragmentflg = 1;
8371                                 }
8372                         }
8373                 }
8374                 /* JRI: if dest is in PF state, do not send data to it */
8375                 if ((asoc->sctp_cmt_on_off > 0) &&
8376                     (net != stcb->asoc.alternate) &&
8377                     (net->dest_state & SCTP_ADDR_PF)) {
8378                         goto no_data_fill;
8379                 }
8380                 if (net->flight_size >= net->cwnd) {
8381                         goto no_data_fill;
8382                 }
8383                 if ((asoc->sctp_cmt_on_off > 0) &&
8384                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8385                     (net->flight_size > max_rwnd_per_dest)) {
8386                         goto no_data_fill;
8387                 }
8388                 /*
8389                  * We need a specific accounting for the usage of the send
8390                  * buffer. We also need to check the number of messages per
8391                  * net. For now, this is better than nothing and it disabled
8392                  * by default...
8393                  */
8394                 if ((asoc->sctp_cmt_on_off > 0) &&
8395                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8396                     (max_send_per_dest > 0) &&
8397                     (net->flight_size > max_send_per_dest)) {
8398                         goto no_data_fill;
8399                 }
8400                 /*********************/
8401                 /* Data transmission */
8402                 /*********************/
8403                 /*
8404                  * if AUTH for DATA is required and no AUTH has been added
8405                  * yet, account for this in the mtu now... if no data can be
8406                  * bundled, this adjustment won't matter anyways since the
8407                  * packet will be going out...
8408                  */
8409                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8410                     stcb->asoc.peer_auth_chunks);
8411                 if (data_auth_reqd && (auth == NULL)) {
8412                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8413                 }
8414                 /* now lets add any data within the MTU constraints */
8415                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8416 #ifdef INET
8417                 case AF_INET:
8418                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8419                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8420                         else
8421                                 omtu = 0;
8422                         break;
8423 #endif
8424 #ifdef INET6
8425                 case AF_INET6:
8426                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8427                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8428                         else
8429                                 omtu = 0;
8430                         break;
8431 #endif
8432                 default:
8433                         /* TSNH */
8434                         omtu = 0;
8435                         break;
8436                 }
8437                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8438                     (skip_data_for_this_net == 0)) ||
8439                     (cookie)) {
8440                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8441                                 if (no_data_chunks) {
8442                                         /* let only control go out */
8443                                         *reason_code = 1;
8444                                         break;
8445                                 }
8446                                 if (net->flight_size >= net->cwnd) {
8447                                         /* skip this net, no room for data */
8448                                         *reason_code = 2;
8449                                         break;
8450                                 }
8451                                 if ((chk->whoTo != NULL) &&
8452                                     (chk->whoTo != net)) {
8453                                         /* Don't send the chunk on this net */
8454                                         continue;
8455                                 }
8456                                 if (asoc->sctp_cmt_on_off == 0) {
8457                                         if ((asoc->alternate) &&
8458                                             (asoc->alternate != net) &&
8459                                             (chk->whoTo == NULL)) {
8460                                                 continue;
8461                                         } else if ((net != asoc->primary_destination) &&
8462                                                     (asoc->alternate == NULL) &&
8463                                             (chk->whoTo == NULL)) {
8464                                                 continue;
8465                                         }
8466                                 }
8467                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8468                                         /*-
8469                                          * strange, we have a chunk that is
8470                                          * to big for its destination and
8471                                          * yet no fragment ok flag.
8472                                          * Something went wrong when the
8473                                          * PMTU changed...we did not mark
8474                                          * this chunk for some reason?? I
8475                                          * will fix it here by letting IP
8476                                          * fragment it for now and printing
8477                                          * a warning. This really should not
8478                                          * happen ...
8479                                          */
8480                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8481                                             chk->send_size, mtu);
8482                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8483                                 }
8484                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8485                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8486                                         struct sctp_data_chunk *dchkh;
8487
8488                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8489                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8490                                 }
8491                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8492                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8493                                         /* ok we will add this one */
8494
8495                                         /*
8496                                          * Add an AUTH chunk, if chunk
8497                                          * requires it, save the offset into
8498                                          * the chain for AUTH
8499                                          */
8500                                         if (data_auth_reqd) {
8501                                                 if (auth == NULL) {
8502                                                         outchain = sctp_add_auth_chunk(outchain,
8503                                                             &endoutchain,
8504                                                             &auth,
8505                                                             &auth_offset,
8506                                                             stcb,
8507                                                             SCTP_DATA);
8508                                                         auth_keyid = chk->auth_keyid;
8509                                                         override_ok = 0;
8510                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8511                                                 } else if (override_ok) {
8512                                                         /*
8513                                                          * use this data's
8514                                                          * keyid
8515                                                          */
8516                                                         auth_keyid = chk->auth_keyid;
8517                                                         override_ok = 0;
8518                                                 } else if (auth_keyid != chk->auth_keyid) {
8519                                                         /*
8520                                                          * different keyid,
8521                                                          * so done bundling
8522                                                          */
8523                                                         break;
8524                                                 }
8525                                         }
8526                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8527                                             chk->send_size, chk->copy_by_ref);
8528                                         if (outchain == NULL) {
8529                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8530                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8531                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8532                                                 }
8533                                                 *reason_code = 3;
8534                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8535                                                 return (ENOMEM);
8536                                         }
8537                                         /* upate our MTU size */
8538                                         /* Do clear IP_DF ? */
8539                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8540                                                 no_fragmentflg = 0;
8541                                         }
8542                                         /* unsigned subtraction of mtu */
8543                                         if (mtu > chk->send_size)
8544                                                 mtu -= chk->send_size;
8545                                         else
8546                                                 mtu = 0;
8547                                         /* unsigned subtraction of r_mtu */
8548                                         if (r_mtu > chk->send_size)
8549                                                 r_mtu -= chk->send_size;
8550                                         else
8551                                                 r_mtu = 0;
8552
8553                                         to_out += chk->send_size;
8554                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8555 #ifdef INVARIANTS
8556                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8557 #else
8558                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8559                                                     mx_mtu, to_out);
8560 #endif
8561                                         }
8562                                         chk->window_probe = 0;
8563                                         data_list[bundle_at++] = chk;
8564                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8565                                                 break;
8566                                         }
8567                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8568                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8569                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8570                                                 } else {
8571                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8572                                                 }
8573                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8574                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8575                                                         /*
8576                                                          * Count number of
8577                                                          * user msg's that
8578                                                          * were fragmented
8579                                                          * we do this by
8580                                                          * counting when we
8581                                                          * see a LAST
8582                                                          * fragment only.
8583                                                          */
8584                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8585                                         }
8586                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8587                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8588                                                         data_list[0]->window_probe = 1;
8589                                                         net->window_probe = 1;
8590                                                 }
8591                                                 break;
8592                                         }
8593                                 } else {
8594                                         /*
8595                                          * Must be sent in order of the
8596                                          * TSN's (on a network)
8597                                          */
8598                                         break;
8599                                 }
8600                         }       /* for (chunk gather loop for this net) */
8601                 }               /* if asoc.state OPEN */
8602 no_data_fill:
8603                 /* Is there something to send for this destination? */
8604                 if (outchain) {
8605                         /* We may need to start a control timer or two */
8606                         if (asconf) {
8607                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8608                                     stcb, net);
8609                                 /*
8610                                  * do NOT clear the asconf flag as it is
8611                                  * used to do appropriate source address
8612                                  * selection.
8613                                  */
8614                         }
8615                         if (cookie) {
8616                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8617                                 cookie = 0;
8618                         }
8619                         /* must start a send timer if data is being sent */
8620                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8621                                 /*
8622                                  * no timer running on this destination
8623                                  * restart it.
8624                                  */
8625                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8626                         }
8627                         /* Now send it, if there is anything to send :> */
8628                         if ((error = sctp_lowlevel_chunk_output(inp,
8629                             stcb,
8630                             net,
8631                             (struct sockaddr *)&net->ro._l_addr,
8632                             outchain,
8633                             auth_offset,
8634                             auth,
8635                             auth_keyid,
8636                             no_fragmentflg,
8637                             bundle_at,
8638                             asconf,
8639                             inp->sctp_lport, stcb->rport,
8640                             htonl(stcb->asoc.peer_vtag),
8641                             net->port, NULL,
8642                             0, 0,
8643                             so_locked))) {
8644                                 /* error, we could not output */
8645                                 if (error == ENOBUFS) {
8646                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8647                                         asoc->ifp_had_enobuf = 1;
8648                                 }
8649                                 if (from_where == 0) {
8650                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8651                                 }
8652                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8653                                 if (hbflag) {
8654                                         if (*now_filled == 0) {
8655                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8656                                                 *now_filled = 1;
8657                                                 *now = net->last_sent_time;
8658                                         } else {
8659                                                 net->last_sent_time = *now;
8660                                         }
8661                                         hbflag = 0;
8662                                 }
8663                                 if (error == EHOSTUNREACH) {
8664                                         /*
8665                                          * Destination went unreachable
8666                                          * during this send
8667                                          */
8668                                         sctp_move_chunks_from_net(stcb, net);
8669                                 }
8670                                 *reason_code = 6;
8671                                 /*-
8672                                  * I add this line to be paranoid. As far as
8673                                  * I can tell the continue, takes us back to
8674                                  * the top of the for, but just to make sure
8675                                  * I will reset these again here.
8676                                  */
8677                                 ctl_cnt = bundle_at = 0;
8678                                 continue;       /* This takes us back to the
8679                                                  * for() for the nets. */
8680                         } else {
8681                                 asoc->ifp_had_enobuf = 0;
8682                         }
8683                         endoutchain = NULL;
8684                         auth = NULL;
8685                         auth_offset = 0;
8686                         if (bundle_at || hbflag) {
8687                                 /* For data/asconf and hb set time */
8688                                 if (*now_filled == 0) {
8689                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8690                                         *now_filled = 1;
8691                                         *now = net->last_sent_time;
8692                                 } else {
8693                                         net->last_sent_time = *now;
8694                                 }
8695                         }
8696                         if (!no_out_cnt) {
8697                                 *num_out += (ctl_cnt + bundle_at);
8698                         }
8699                         if (bundle_at) {
8700                                 /* setup for a RTO measurement */
8701                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8702                                 /* fill time if not already filled */
8703                                 if (*now_filled == 0) {
8704                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8705                                         *now_filled = 1;
8706                                         *now = asoc->time_last_sent;
8707                                 } else {
8708                                         asoc->time_last_sent = *now;
8709                                 }
8710                                 if (net->rto_needed) {
8711                                         data_list[0]->do_rtt = 1;
8712                                         net->rto_needed = 0;
8713                                 }
8714                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8715                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8716                         }
8717                         if (one_chunk) {
8718                                 break;
8719                         }
8720                 }
8721                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8722                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8723                 }
8724         }
8725         if (old_start_at == NULL) {
8726                 old_start_at = start_at;
8727                 start_at = TAILQ_FIRST(&asoc->nets);
8728                 if (old_start_at)
8729                         goto again_one_more_time;
8730         }
8731         /*
8732          * At the end there should be no NON timed chunks hanging on this
8733          * queue.
8734          */
8735         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8736                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8737         }
8738         if ((*num_out == 0) && (*reason_code == 0)) {
8739                 *reason_code = 4;
8740         } else {
8741                 *reason_code = 5;
8742         }
8743         sctp_clean_up_ctl(stcb, asoc, so_locked);
8744         return (0);
8745 }
8746
8747 void
8748 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8749 {
8750         /*-
8751          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8752          * the control chunk queue.
8753          */
8754         struct sctp_chunkhdr *hdr;
8755         struct sctp_tmit_chunk *chk;
8756         struct mbuf *mat;
8757
8758         SCTP_TCB_LOCK_ASSERT(stcb);
8759         sctp_alloc_a_chunk(stcb, chk);
8760         if (chk == NULL) {
8761                 /* no memory */
8762                 sctp_m_freem(op_err);
8763                 return;
8764         }
8765         chk->copy_by_ref = 0;
8766         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8767         if (op_err == NULL) {
8768                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8769                 return;
8770         }
8771         chk->send_size = 0;
8772         mat = op_err;
8773         while (mat != NULL) {
8774                 chk->send_size += SCTP_BUF_LEN(mat);
8775                 mat = SCTP_BUF_NEXT(mat);
8776         }
8777         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8778         chk->rec.chunk_id.can_take_data = 1;
8779         chk->sent = SCTP_DATAGRAM_UNSENT;
8780         chk->snd_count = 0;
8781         chk->flags = 0;
8782         chk->asoc = &stcb->asoc;
8783         chk->data = op_err;
8784         chk->whoTo = NULL;
8785         hdr = mtod(op_err, struct sctp_chunkhdr *);
8786         hdr->chunk_type = SCTP_OPERATION_ERROR;
8787         hdr->chunk_flags = 0;
8788         hdr->chunk_length = htons(chk->send_size);
8789         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8790             chk,
8791             sctp_next);
8792         chk->asoc->ctrl_queue_cnt++;
8793 }
8794
8795 int
8796 sctp_send_cookie_echo(struct mbuf *m,
8797     int offset,
8798     struct sctp_tcb *stcb,
8799     struct sctp_nets *net)
8800 {
8801         /*-
8802          * pull out the cookie and put it at the front of the control chunk
8803          * queue.
8804          */
8805         int at;
8806         struct mbuf *cookie;
8807         struct sctp_paramhdr parm, *phdr;
8808         struct sctp_chunkhdr *hdr;
8809         struct sctp_tmit_chunk *chk;
8810         uint16_t ptype, plen;
8811
8812         /* First find the cookie in the param area */
8813         cookie = NULL;
8814         at = offset + sizeof(struct sctp_init_chunk);
8815
8816         SCTP_TCB_LOCK_ASSERT(stcb);
8817         do {
8818                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8819                 if (phdr == NULL) {
8820                         return (-3);
8821                 }
8822                 ptype = ntohs(phdr->param_type);
8823                 plen = ntohs(phdr->param_length);
8824                 if (ptype == SCTP_STATE_COOKIE) {
8825                         int pad;
8826
8827                         /* found the cookie */
8828                         if ((pad = (plen % 4))) {
8829                                 plen += 4 - pad;
8830                         }
8831                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8832                         if (cookie == NULL) {
8833                                 /* No memory */
8834                                 return (-2);
8835                         }
8836 #ifdef SCTP_MBUF_LOGGING
8837                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8838                                 struct mbuf *mat;
8839
8840                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8841                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8842                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8843                                         }
8844                                 }
8845                         }
8846 #endif
8847                         break;
8848                 }
8849                 at += SCTP_SIZE32(plen);
8850         } while (phdr);
8851         if (cookie == NULL) {
8852                 /* Did not find the cookie */
8853                 return (-3);
8854         }
8855         /* ok, we got the cookie lets change it into a cookie echo chunk */
8856
8857         /* first the change from param to cookie */
8858         hdr = mtod(cookie, struct sctp_chunkhdr *);
8859         hdr->chunk_type = SCTP_COOKIE_ECHO;
8860         hdr->chunk_flags = 0;
8861         /* get the chunk stuff now and place it in the FRONT of the queue */
8862         sctp_alloc_a_chunk(stcb, chk);
8863         if (chk == NULL) {
8864                 /* no memory */
8865                 sctp_m_freem(cookie);
8866                 return (-5);
8867         }
8868         chk->copy_by_ref = 0;
8869         chk->send_size = plen;
8870         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8871         chk->rec.chunk_id.can_take_data = 0;
8872         chk->sent = SCTP_DATAGRAM_UNSENT;
8873         chk->snd_count = 0;
8874         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8875         chk->asoc = &stcb->asoc;
8876         chk->data = cookie;
8877         chk->whoTo = net;
8878         atomic_add_int(&chk->whoTo->ref_count, 1);
8879         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8880         chk->asoc->ctrl_queue_cnt++;
8881         return (0);
8882 }
8883
8884 void
8885 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8886     struct mbuf *m,
8887     int offset,
8888     int chk_length,
8889     struct sctp_nets *net)
8890 {
8891         /*
8892          * take a HB request and make it into a HB ack and send it.
8893          */
8894         struct mbuf *outchain;
8895         struct sctp_chunkhdr *chdr;
8896         struct sctp_tmit_chunk *chk;
8897
8898
8899         if (net == NULL)
8900                 /* must have a net pointer */
8901                 return;
8902
8903         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8904         if (outchain == NULL) {
8905                 /* gak out of memory */
8906                 return;
8907         }
8908 #ifdef SCTP_MBUF_LOGGING
8909         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8910                 struct mbuf *mat;
8911
8912                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
8913                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8914                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8915                         }
8916                 }
8917         }
8918 #endif
8919         chdr = mtod(outchain, struct sctp_chunkhdr *);
8920         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8921         chdr->chunk_flags = 0;
8922         if (chk_length % 4) {
8923                 /* need pad */
8924                 uint32_t cpthis = 0;
8925                 int padlen;
8926
8927                 padlen = 4 - (chk_length % 4);
8928                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8929         }
8930         sctp_alloc_a_chunk(stcb, chk);
8931         if (chk == NULL) {
8932                 /* no memory */
8933                 sctp_m_freem(outchain);
8934                 return;
8935         }
8936         chk->copy_by_ref = 0;
8937         chk->send_size = chk_length;
8938         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8939         chk->rec.chunk_id.can_take_data = 1;
8940         chk->sent = SCTP_DATAGRAM_UNSENT;
8941         chk->snd_count = 0;
8942         chk->flags = 0;
8943         chk->asoc = &stcb->asoc;
8944         chk->data = outchain;
8945         chk->whoTo = net;
8946         atomic_add_int(&chk->whoTo->ref_count, 1);
8947         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8948         chk->asoc->ctrl_queue_cnt++;
8949 }
8950
8951 void
8952 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8953 {
8954         /* formulate and queue a cookie-ack back to sender */
8955         struct mbuf *cookie_ack;
8956         struct sctp_chunkhdr *hdr;
8957         struct sctp_tmit_chunk *chk;
8958
8959         cookie_ack = NULL;
8960         SCTP_TCB_LOCK_ASSERT(stcb);
8961
8962         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8963         if (cookie_ack == NULL) {
8964                 /* no mbuf's */
8965                 return;
8966         }
8967         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8968         sctp_alloc_a_chunk(stcb, chk);
8969         if (chk == NULL) {
8970                 /* no memory */
8971                 sctp_m_freem(cookie_ack);
8972                 return;
8973         }
8974         chk->copy_by_ref = 0;
8975         chk->send_size = sizeof(struct sctp_chunkhdr);
8976         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8977         chk->rec.chunk_id.can_take_data = 1;
8978         chk->sent = SCTP_DATAGRAM_UNSENT;
8979         chk->snd_count = 0;
8980         chk->flags = 0;
8981         chk->asoc = &stcb->asoc;
8982         chk->data = cookie_ack;
8983         if (chk->asoc->last_control_chunk_from != NULL) {
8984                 chk->whoTo = chk->asoc->last_control_chunk_from;
8985                 atomic_add_int(&chk->whoTo->ref_count, 1);
8986         } else {
8987                 chk->whoTo = NULL;
8988         }
8989         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8990         hdr->chunk_type = SCTP_COOKIE_ACK;
8991         hdr->chunk_flags = 0;
8992         hdr->chunk_length = htons(chk->send_size);
8993         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8994         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8995         chk->asoc->ctrl_queue_cnt++;
8996         return;
8997 }
8998
8999
9000 void
9001 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9002 {
9003         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9004         struct mbuf *m_shutdown_ack;
9005         struct sctp_shutdown_ack_chunk *ack_cp;
9006         struct sctp_tmit_chunk *chk;
9007
9008         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9009         if (m_shutdown_ack == NULL) {
9010                 /* no mbuf's */
9011                 return;
9012         }
9013         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9014         sctp_alloc_a_chunk(stcb, chk);
9015         if (chk == NULL) {
9016                 /* no memory */
9017                 sctp_m_freem(m_shutdown_ack);
9018                 return;
9019         }
9020         chk->copy_by_ref = 0;
9021         chk->send_size = sizeof(struct sctp_chunkhdr);
9022         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9023         chk->rec.chunk_id.can_take_data = 1;
9024         chk->sent = SCTP_DATAGRAM_UNSENT;
9025         chk->snd_count = 0;
9026         chk->flags = 0;
9027         chk->asoc = &stcb->asoc;
9028         chk->data = m_shutdown_ack;
9029         chk->whoTo = net;
9030         if (chk->whoTo) {
9031                 atomic_add_int(&chk->whoTo->ref_count, 1);
9032         }
9033         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9034         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9035         ack_cp->ch.chunk_flags = 0;
9036         ack_cp->ch.chunk_length = htons(chk->send_size);
9037         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9038         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9039         chk->asoc->ctrl_queue_cnt++;
9040         return;
9041 }
9042
9043 void
9044 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9045 {
9046         /* formulate and queue a SHUTDOWN to the sender */
9047         struct mbuf *m_shutdown;
9048         struct sctp_shutdown_chunk *shutdown_cp;
9049         struct sctp_tmit_chunk *chk;
9050
9051         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9052         if (m_shutdown == NULL) {
9053                 /* no mbuf's */
9054                 return;
9055         }
9056         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9057         sctp_alloc_a_chunk(stcb, chk);
9058         if (chk == NULL) {
9059                 /* no memory */
9060                 sctp_m_freem(m_shutdown);
9061                 return;
9062         }
9063         chk->copy_by_ref = 0;
9064         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9065         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9066         chk->rec.chunk_id.can_take_data = 1;
9067         chk->sent = SCTP_DATAGRAM_UNSENT;
9068         chk->snd_count = 0;
9069         chk->flags = 0;
9070         chk->asoc = &stcb->asoc;
9071         chk->data = m_shutdown;
9072         chk->whoTo = net;
9073         if (chk->whoTo) {
9074                 atomic_add_int(&chk->whoTo->ref_count, 1);
9075         }
9076         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9077         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9078         shutdown_cp->ch.chunk_flags = 0;
9079         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9080         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9081         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9082         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9083         chk->asoc->ctrl_queue_cnt++;
9084         return;
9085 }
9086
9087 void
9088 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9089 {
9090         /*
9091          * formulate and queue an ASCONF to the peer. ASCONF parameters
9092          * should be queued on the assoc queue.
9093          */
9094         struct sctp_tmit_chunk *chk;
9095         struct mbuf *m_asconf;
9096         int len;
9097
9098         SCTP_TCB_LOCK_ASSERT(stcb);
9099
9100         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9101             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9102                 /* can't send a new one if there is one in flight already */
9103                 return;
9104         }
9105         /* compose an ASCONF chunk, maximum length is PMTU */
9106         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9107         if (m_asconf == NULL) {
9108                 return;
9109         }
9110         sctp_alloc_a_chunk(stcb, chk);
9111         if (chk == NULL) {
9112                 /* no memory */
9113                 sctp_m_freem(m_asconf);
9114                 return;
9115         }
9116         chk->copy_by_ref = 0;
9117         chk->data = m_asconf;
9118         chk->send_size = len;
9119         chk->rec.chunk_id.id = SCTP_ASCONF;
9120         chk->rec.chunk_id.can_take_data = 0;
9121         chk->sent = SCTP_DATAGRAM_UNSENT;
9122         chk->snd_count = 0;
9123         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9124         chk->asoc = &stcb->asoc;
9125         chk->whoTo = net;
9126         if (chk->whoTo) {
9127                 atomic_add_int(&chk->whoTo->ref_count, 1);
9128         }
9129         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9130         chk->asoc->ctrl_queue_cnt++;
9131         return;
9132 }
9133
9134 void
9135 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9136 {
9137         /*
9138          * formulate and queue a asconf-ack back to sender. the asconf-ack
9139          * must be stored in the tcb.
9140          */
9141         struct sctp_tmit_chunk *chk;
9142         struct sctp_asconf_ack *ack, *latest_ack;
9143         struct mbuf *m_ack;
9144         struct sctp_nets *net = NULL;
9145
9146         SCTP_TCB_LOCK_ASSERT(stcb);
9147         /* Get the latest ASCONF-ACK */
9148         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9149         if (latest_ack == NULL) {
9150                 return;
9151         }
9152         if (latest_ack->last_sent_to != NULL &&
9153             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9154                 /* we're doing a retransmission */
9155                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9156                 if (net == NULL) {
9157                         /* no alternate */
9158                         if (stcb->asoc.last_control_chunk_from == NULL) {
9159                                 if (stcb->asoc.alternate) {
9160                                         net = stcb->asoc.alternate;
9161                                 } else {
9162                                         net = stcb->asoc.primary_destination;
9163                                 }
9164                         } else {
9165                                 net = stcb->asoc.last_control_chunk_from;
9166                         }
9167                 }
9168         } else {
9169                 /* normal case */
9170                 if (stcb->asoc.last_control_chunk_from == NULL) {
9171                         if (stcb->asoc.alternate) {
9172                                 net = stcb->asoc.alternate;
9173                         } else {
9174                                 net = stcb->asoc.primary_destination;
9175                         }
9176                 } else {
9177                         net = stcb->asoc.last_control_chunk_from;
9178                 }
9179         }
9180         latest_ack->last_sent_to = net;
9181
9182         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9183                 if (ack->data == NULL) {
9184                         continue;
9185                 }
9186                 /* copy the asconf_ack */
9187                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9188                 if (m_ack == NULL) {
9189                         /* couldn't copy it */
9190                         return;
9191                 }
9192 #ifdef SCTP_MBUF_LOGGING
9193                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9194                         struct mbuf *mat;
9195
9196                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9197                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9198                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9199                                 }
9200                         }
9201                 }
9202 #endif
9203
9204                 sctp_alloc_a_chunk(stcb, chk);
9205                 if (chk == NULL) {
9206                         /* no memory */
9207                         if (m_ack)
9208                                 sctp_m_freem(m_ack);
9209                         return;
9210                 }
9211                 chk->copy_by_ref = 0;
9212
9213                 chk->whoTo = net;
9214                 if (chk->whoTo) {
9215                         atomic_add_int(&chk->whoTo->ref_count, 1);
9216                 }
9217                 chk->data = m_ack;
9218                 chk->send_size = 0;
9219                 /* Get size */
9220                 chk->send_size = ack->len;
9221                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9222                 chk->rec.chunk_id.can_take_data = 1;
9223                 chk->sent = SCTP_DATAGRAM_UNSENT;
9224                 chk->snd_count = 0;
9225                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9226                 chk->asoc = &stcb->asoc;
9227
9228                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9229                 chk->asoc->ctrl_queue_cnt++;
9230         }
9231         return;
9232 }
9233
9234
9235 static int
9236 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9237     struct sctp_tcb *stcb,
9238     struct sctp_association *asoc,
9239     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9240 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9241     SCTP_UNUSED
9242 #endif
9243 )
9244 {
9245         /*-
9246          * send out one MTU of retransmission. If fast_retransmit is
9247          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9248          * rwnd. For a Cookie or Asconf in the control chunk queue we
9249          * retransmit them by themselves.
9250          *
9251          * For data chunks we will pick out the lowest TSN's in the sent_queue
9252          * marked for resend and bundle them all together (up to a MTU of
9253          * destination). The address to send to should have been
9254          * selected/changed where the retransmission was marked (i.e. in FR
9255          * or t3-timeout routines).
9256          */
9257         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9258         struct sctp_tmit_chunk *chk, *fwd;
9259         struct mbuf *m, *endofchain;
9260         struct sctp_nets *net = NULL;
9261         uint32_t tsns_sent = 0;
9262         int no_fragmentflg, bundle_at, cnt_thru;
9263         unsigned int mtu;
9264         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9265         struct sctp_auth_chunk *auth = NULL;
9266         uint32_t auth_offset = 0;
9267         uint16_t auth_keyid;
9268         int override_ok = 1;
9269         int data_auth_reqd = 0;
9270         uint32_t dmtu = 0;
9271
9272         SCTP_TCB_LOCK_ASSERT(stcb);
9273         tmr_started = ctl_cnt = bundle_at = error = 0;
9274         no_fragmentflg = 1;
9275         fwd_tsn = 0;
9276         *cnt_out = 0;
9277         fwd = NULL;
9278         endofchain = m = NULL;
9279         auth_keyid = stcb->asoc.authinfo.active_keyid;
9280 #ifdef SCTP_AUDITING_ENABLED
9281         sctp_audit_log(0xC3, 1);
9282 #endif
9283         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9284             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9285                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9286                     asoc->sent_queue_retran_cnt);
9287                 asoc->sent_queue_cnt = 0;
9288                 asoc->sent_queue_cnt_removeable = 0;
9289                 /* send back 0/0 so we enter normal transmission */
9290                 *cnt_out = 0;
9291                 return (0);
9292         }
9293         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9294                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9295                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9296                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9297                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9298                                 continue;
9299                         }
9300                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9301                                 if (chk != asoc->str_reset) {
9302                                         /*
9303                                          * not eligible for retran if its
9304                                          * not ours
9305                                          */
9306                                         continue;
9307                                 }
9308                         }
9309                         ctl_cnt++;
9310                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9311                                 fwd_tsn = 1;
9312                         }
9313                         /*
9314                          * Add an AUTH chunk, if chunk requires it save the
9315                          * offset into the chain for AUTH
9316                          */
9317                         if ((auth == NULL) &&
9318                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9319                             stcb->asoc.peer_auth_chunks))) {
9320                                 m = sctp_add_auth_chunk(m, &endofchain,
9321                                     &auth, &auth_offset,
9322                                     stcb,
9323                                     chk->rec.chunk_id.id);
9324                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9325                         }
9326                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9327                         break;
9328                 }
9329         }
9330         one_chunk = 0;
9331         cnt_thru = 0;
9332         /* do we have control chunks to retransmit? */
9333         if (m != NULL) {
9334                 /* Start a timer no matter if we suceed or fail */
9335                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9336                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9337                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9338                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9339                 chk->snd_count++;       /* update our count */
9340                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9341                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9342                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9343                     no_fragmentflg, 0, 0,
9344                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9345                     chk->whoTo->port, NULL,
9346                     0, 0,
9347                     so_locked))) {
9348                         SCTP_STAT_INCR(sctps_lowlevelerr);
9349                         return (error);
9350                 }
9351                 endofchain = NULL;
9352                 auth = NULL;
9353                 auth_offset = 0;
9354                 /*
9355                  * We don't want to mark the net->sent time here since this
9356                  * we use this for HB and retrans cannot measure RTT
9357                  */
9358                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9359                 *cnt_out += 1;
9360                 chk->sent = SCTP_DATAGRAM_SENT;
9361                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9362                 if (fwd_tsn == 0) {
9363                         return (0);
9364                 } else {
9365                         /* Clean up the fwd-tsn list */
9366                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9367                         return (0);
9368                 }
9369         }
9370         /*
9371          * Ok, it is just data retransmission we need to do or that and a
9372          * fwd-tsn with it all.
9373          */
9374         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9375                 return (SCTP_RETRAN_DONE);
9376         }
9377         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9378             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9379                 /* not yet open, resend the cookie and that is it */
9380                 return (1);
9381         }
9382 #ifdef SCTP_AUDITING_ENABLED
9383         sctp_auditing(20, inp, stcb, NULL);
9384 #endif
9385         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9386         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9387                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9388                         /* No, not sent to this net or not ready for rtx */
9389                         continue;
9390                 }
9391                 if (chk->data == NULL) {
9392                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9393                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9394                         continue;
9395                 }
9396                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9397                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9398                         /* Gak, we have exceeded max unlucky retran, abort! */
9399                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9400                             chk->snd_count,
9401                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9402                         atomic_add_int(&stcb->asoc.refcnt, 1);
9403                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9404                         SCTP_TCB_LOCK(stcb);
9405                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9406                         return (SCTP_RETRAN_EXIT);
9407                 }
9408                 /* pick up the net */
9409                 net = chk->whoTo;
9410                 switch (net->ro._l_addr.sa.sa_family) {
9411 #ifdef INET
9412                 case AF_INET:
9413                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9414                         break;
9415 #endif
9416 #ifdef INET6
9417                 case AF_INET6:
9418                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9419                         break;
9420 #endif
9421                 default:
9422                         /* TSNH */
9423                         mtu = net->mtu;
9424                         break;
9425                 }
9426
9427                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9428                         /* No room in peers rwnd */
9429                         uint32_t tsn;
9430
9431                         tsn = asoc->last_acked_seq + 1;
9432                         if (tsn == chk->rec.data.TSN_seq) {
9433                                 /*
9434                                  * we make a special exception for this
9435                                  * case. The peer has no rwnd but is missing
9436                                  * the lowest chunk.. which is probably what
9437                                  * is holding up the rwnd.
9438                                  */
9439                                 goto one_chunk_around;
9440                         }
9441                         return (1);
9442                 }
9443 one_chunk_around:
9444                 if (asoc->peers_rwnd < mtu) {
9445                         one_chunk = 1;
9446                         if ((asoc->peers_rwnd == 0) &&
9447                             (asoc->total_flight == 0)) {
9448                                 chk->window_probe = 1;
9449                                 chk->whoTo->window_probe = 1;
9450                         }
9451                 }
9452 #ifdef SCTP_AUDITING_ENABLED
9453                 sctp_audit_log(0xC3, 2);
9454 #endif
9455                 bundle_at = 0;
9456                 m = NULL;
9457                 net->fast_retran_ip = 0;
9458                 if (chk->rec.data.doing_fast_retransmit == 0) {
9459                         /*
9460                          * if no FR in progress skip destination that have
9461                          * flight_size > cwnd.
9462                          */
9463                         if (net->flight_size >= net->cwnd) {
9464                                 continue;
9465                         }
9466                 } else {
9467                         /*
9468                          * Mark the destination net to have FR recovery
9469                          * limits put on it.
9470                          */
9471                         *fr_done = 1;
9472                         net->fast_retran_ip = 1;
9473                 }
9474
9475                 /*
9476                  * if no AUTH is yet included and this chunk requires it,
9477                  * make sure to account for it.  We don't apply the size
9478                  * until the AUTH chunk is actually added below in case
9479                  * there is no room for this chunk.
9480                  */
9481                 if (data_auth_reqd && (auth == NULL)) {
9482                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9483                 } else
9484                         dmtu = 0;
9485
9486                 if ((chk->send_size <= (mtu - dmtu)) ||
9487                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9488                         /* ok we will add this one */
9489                         if (data_auth_reqd) {
9490                                 if (auth == NULL) {
9491                                         m = sctp_add_auth_chunk(m,
9492                                             &endofchain,
9493                                             &auth,
9494                                             &auth_offset,
9495                                             stcb,
9496                                             SCTP_DATA);
9497                                         auth_keyid = chk->auth_keyid;
9498                                         override_ok = 0;
9499                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9500                                 } else if (override_ok) {
9501                                         auth_keyid = chk->auth_keyid;
9502                                         override_ok = 0;
9503                                 } else if (chk->auth_keyid != auth_keyid) {
9504                                         /* different keyid, so done bundling */
9505                                         break;
9506                                 }
9507                         }
9508                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9509                         if (m == NULL) {
9510                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9511                                 return (ENOMEM);
9512                         }
9513                         /* Do clear IP_DF ? */
9514                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9515                                 no_fragmentflg = 0;
9516                         }
9517                         /* upate our MTU size */
9518                         if (mtu > (chk->send_size + dmtu))
9519                                 mtu -= (chk->send_size + dmtu);
9520                         else
9521                                 mtu = 0;
9522                         data_list[bundle_at++] = chk;
9523                         if (one_chunk && (asoc->total_flight <= 0)) {
9524                                 SCTP_STAT_INCR(sctps_windowprobed);
9525                         }
9526                 }
9527                 if (one_chunk == 0) {
9528                         /*
9529                          * now are there anymore forward from chk to pick
9530                          * up?
9531                          */
9532                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9533                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9534                                         /* Nope, not for retran */
9535                                         continue;
9536                                 }
9537                                 if (fwd->whoTo != net) {
9538                                         /* Nope, not the net in question */
9539                                         continue;
9540                                 }
9541                                 if (data_auth_reqd && (auth == NULL)) {
9542                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9543                                 } else
9544                                         dmtu = 0;
9545                                 if (fwd->send_size <= (mtu - dmtu)) {
9546                                         if (data_auth_reqd) {
9547                                                 if (auth == NULL) {
9548                                                         m = sctp_add_auth_chunk(m,
9549                                                             &endofchain,
9550                                                             &auth,
9551                                                             &auth_offset,
9552                                                             stcb,
9553                                                             SCTP_DATA);
9554                                                         auth_keyid = fwd->auth_keyid;
9555                                                         override_ok = 0;
9556                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9557                                                 } else if (override_ok) {
9558                                                         auth_keyid = fwd->auth_keyid;
9559                                                         override_ok = 0;
9560                                                 } else if (fwd->auth_keyid != auth_keyid) {
9561                                                         /*
9562                                                          * different keyid,
9563                                                          * so done bundling
9564                                                          */
9565                                                         break;
9566                                                 }
9567                                         }
9568                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9569                                         if (m == NULL) {
9570                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9571                                                 return (ENOMEM);
9572                                         }
9573                                         /* Do clear IP_DF ? */
9574                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9575                                                 no_fragmentflg = 0;
9576                                         }
9577                                         /* upate our MTU size */
9578                                         if (mtu > (fwd->send_size + dmtu))
9579                                                 mtu -= (fwd->send_size + dmtu);
9580                                         else
9581                                                 mtu = 0;
9582                                         data_list[bundle_at++] = fwd;
9583                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9584                                                 break;
9585                                         }
9586                                 } else {
9587                                         /* can't fit so we are done */
9588                                         break;
9589                                 }
9590                         }
9591                 }
9592                 /* Is there something to send for this destination? */
9593                 if (m) {
9594                         /*
9595                          * No matter if we fail/or suceed we should start a
9596                          * timer. A failure is like a lost IP packet :-)
9597                          */
9598                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9599                                 /*
9600                                  * no timer running on this destination
9601                                  * restart it.
9602                                  */
9603                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9604                                 tmr_started = 1;
9605                         }
9606                         /* Now lets send it, if there is anything to send :> */
9607                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9608                             (struct sockaddr *)&net->ro._l_addr, m,
9609                             auth_offset, auth, auth_keyid,
9610                             no_fragmentflg, 0, 0,
9611                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9612                             net->port, NULL,
9613                             0, 0,
9614                             so_locked))) {
9615                                 /* error, we could not output */
9616                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9617                                 return (error);
9618                         }
9619                         endofchain = NULL;
9620                         auth = NULL;
9621                         auth_offset = 0;
9622                         /* For HB's */
9623                         /*
9624                          * We don't want to mark the net->sent time here
9625                          * since this we use this for HB and retrans cannot
9626                          * measure RTT
9627                          */
9628                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9629
9630                         /* For auto-close */
9631                         cnt_thru++;
9632                         if (*now_filled == 0) {
9633                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9634                                 *now = asoc->time_last_sent;
9635                                 *now_filled = 1;
9636                         } else {
9637                                 asoc->time_last_sent = *now;
9638                         }
9639                         *cnt_out += bundle_at;
9640 #ifdef SCTP_AUDITING_ENABLED
9641                         sctp_audit_log(0xC4, bundle_at);
9642 #endif
9643                         if (bundle_at) {
9644                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9645                         }
9646                         for (i = 0; i < bundle_at; i++) {
9647                                 SCTP_STAT_INCR(sctps_sendretransdata);
9648                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9649                                 /*
9650                                  * When we have a revoked data, and we
9651                                  * retransmit it, then we clear the revoked
9652                                  * flag since this flag dictates if we
9653                                  * subtracted from the fs
9654                                  */
9655                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9656                                         /* Deflate the cwnd */
9657                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9658                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9659                                 }
9660                                 data_list[i]->snd_count++;
9661                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9662                                 /* record the time */
9663                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9664                                 if (data_list[i]->book_size_scale) {
9665                                         /*
9666                                          * need to double the book size on
9667                                          * this one
9668                                          */
9669                                         data_list[i]->book_size_scale = 0;
9670                                         /*
9671                                          * Since we double the booksize, we
9672                                          * must also double the output queue
9673                                          * size, since this get shrunk when
9674                                          * we free by this amount.
9675                                          */
9676                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9677                                         data_list[i]->book_size *= 2;
9678
9679
9680                                 } else {
9681                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9682                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9683                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9684                                         }
9685                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9686                                             (uint32_t) (data_list[i]->send_size +
9687                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9688                                 }
9689                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9690                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9691                                             data_list[i]->whoTo->flight_size,
9692                                             data_list[i]->book_size,
9693                                             (uintptr_t) data_list[i]->whoTo,
9694                                             data_list[i]->rec.data.TSN_seq);
9695                                 }
9696                                 sctp_flight_size_increase(data_list[i]);
9697                                 sctp_total_flight_increase(stcb, data_list[i]);
9698                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9699                                         /* SWS sender side engages */
9700                                         asoc->peers_rwnd = 0;
9701                                 }
9702                                 if ((i == 0) &&
9703                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9704                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9705                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9706                                             (tmr_started == 0)) {
9707                                                 /*-
9708                                                  * ok we just fast-retrans'd
9709                                                  * the lowest TSN, i.e the
9710                                                  * first on the list. In
9711                                                  * this case we want to give
9712                                                  * some more time to get a
9713                                                  * SACK back without a
9714                                                  * t3-expiring.
9715                                                  */
9716                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9717                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9718                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9719                                         }
9720                                 }
9721                         }
9722                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9723                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9724                         }
9725 #ifdef SCTP_AUDITING_ENABLED
9726                         sctp_auditing(21, inp, stcb, NULL);
9727 #endif
9728                 } else {
9729                         /* None will fit */
9730                         return (1);
9731                 }
9732                 if (asoc->sent_queue_retran_cnt <= 0) {
9733                         /* all done we have no more to retran */
9734                         asoc->sent_queue_retran_cnt = 0;
9735                         break;
9736                 }
9737                 if (one_chunk) {
9738                         /* No more room in rwnd */
9739                         return (1);
9740                 }
9741                 /* stop the for loop here. we sent out a packet */
9742                 break;
9743         }
9744         return (0);
9745 }
9746
9747 static void
9748 sctp_timer_validation(struct sctp_inpcb *inp,
9749     struct sctp_tcb *stcb,
9750     struct sctp_association *asoc)
9751 {
9752         struct sctp_nets *net;
9753
9754         /* Validate that a timer is running somewhere */
9755         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9756                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9757                         /* Here is a timer */
9758                         return;
9759                 }
9760         }
9761         SCTP_TCB_LOCK_ASSERT(stcb);
9762         /* Gak, we did not have a timer somewhere */
9763         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9764         if (asoc->alternate) {
9765                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9766         } else {
9767                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9768         }
9769         return;
9770 }
9771
9772 void
9773 sctp_chunk_output(struct sctp_inpcb *inp,
9774     struct sctp_tcb *stcb,
9775     int from_where,
9776     int so_locked
9777 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9778     SCTP_UNUSED
9779 #endif
9780 )
9781 {
9782         /*-
9783          * Ok this is the generic chunk service queue. we must do the
9784          * following:
9785          * - See if there are retransmits pending, if so we must
9786          *   do these first.
9787          * - Service the stream queue that is next, moving any
9788          *   message (note I must get a complete message i.e.
9789          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9790          *   TSN's
9791          * - Check to see if the cwnd/rwnd allows any output, if so we
9792          *   go ahead and fomulate and send the low level chunks. Making sure
9793          *   to combine any control in the control chunk queue also.
9794          */
9795         struct sctp_association *asoc;
9796         struct sctp_nets *net;
9797         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9798         unsigned int burst_cnt = 0;
9799         struct timeval now;
9800         int now_filled = 0;
9801         int nagle_on;
9802         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9803         int un_sent = 0;
9804         int fr_done;
9805         unsigned int tot_frs = 0;
9806
9807         asoc = &stcb->asoc;
9808         /* The Nagle algorithm is only applied when handling a send call. */
9809         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9810                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9811                         nagle_on = 0;
9812                 } else {
9813                         nagle_on = 1;
9814                 }
9815         } else {
9816                 nagle_on = 0;
9817         }
9818         SCTP_TCB_LOCK_ASSERT(stcb);
9819
9820         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9821
9822         if ((un_sent <= 0) &&
9823             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9824             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9825             (asoc->sent_queue_retran_cnt == 0)) {
9826                 /* Nothing to do unless there is something to be sent left */
9827                 return;
9828         }
9829         /*
9830          * Do we have something to send, data or control AND a sack timer
9831          * running, if so piggy-back the sack.
9832          */
9833         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9834                 sctp_send_sack(stcb, so_locked);
9835                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9836         }
9837         while (asoc->sent_queue_retran_cnt) {
9838                 /*-
9839                  * Ok, it is retransmission time only, we send out only ONE
9840                  * packet with a single call off to the retran code.
9841                  */
9842                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9843                         /*-
9844                          * Special hook for handling cookiess discarded
9845                          * by peer that carried data. Send cookie-ack only
9846                          * and then the next call with get the retran's.
9847                          */
9848                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9849                             from_where,
9850                             &now, &now_filled, frag_point, so_locked);
9851                         return;
9852                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9853                         /* if its not from a HB then do it */
9854                         fr_done = 0;
9855                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9856                         if (fr_done) {
9857                                 tot_frs++;
9858                         }
9859                 } else {
9860                         /*
9861                          * its from any other place, we don't allow retran
9862                          * output (only control)
9863                          */
9864                         ret = 1;
9865                 }
9866                 if (ret > 0) {
9867                         /* Can't send anymore */
9868                         /*-
9869                          * now lets push out control by calling med-level
9870                          * output once. this assures that we WILL send HB's
9871                          * if queued too.
9872                          */
9873                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9874                             from_where,
9875                             &now, &now_filled, frag_point, so_locked);
9876 #ifdef SCTP_AUDITING_ENABLED
9877                         sctp_auditing(8, inp, stcb, NULL);
9878 #endif
9879                         sctp_timer_validation(inp, stcb, asoc);
9880                         return;
9881                 }
9882                 if (ret < 0) {
9883                         /*-
9884                          * The count was off.. retran is not happening so do
9885                          * the normal retransmission.
9886                          */
9887 #ifdef SCTP_AUDITING_ENABLED
9888                         sctp_auditing(9, inp, stcb, NULL);
9889 #endif
9890                         if (ret == SCTP_RETRAN_EXIT) {
9891                                 return;
9892                         }
9893                         break;
9894                 }
9895                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9896                         /* Only one transmission allowed out of a timeout */
9897 #ifdef SCTP_AUDITING_ENABLED
9898                         sctp_auditing(10, inp, stcb, NULL);
9899 #endif
9900                         /* Push out any control */
9901                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9902                             &now, &now_filled, frag_point, so_locked);
9903                         return;
9904                 }
9905                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9906                         /* Hit FR burst limit */
9907                         return;
9908                 }
9909                 if ((num_out == 0) && (ret == 0)) {
9910                         /* No more retrans to send */
9911                         break;
9912                 }
9913         }
9914 #ifdef SCTP_AUDITING_ENABLED
9915         sctp_auditing(12, inp, stcb, NULL);
9916 #endif
9917         /* Check for bad destinations, if they exist move chunks around. */
9918         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9919                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9920                         /*-
9921                          * if possible move things off of this address we
9922                          * still may send below due to the dormant state but
9923                          * we try to find an alternate address to send to
9924                          * and if we have one we move all queued data on the
9925                          * out wheel to this alternate address.
9926                          */
9927                         if (net->ref_count > 1)
9928                                 sctp_move_chunks_from_net(stcb, net);
9929                 } else {
9930                         /*-
9931                          * if ((asoc->sat_network) || (net->addr_is_local))
9932                          * { burst_limit = asoc->max_burst *
9933                          * SCTP_SAT_NETWORK_BURST_INCR; }
9934                          */
9935                         if (asoc->max_burst > 0) {
9936                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9937                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9938                                                 /*
9939                                                  * JRS - Use the congestion
9940                                                  * control given in the
9941                                                  * congestion control module
9942                                                  */
9943                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9944                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9945                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9946                                                 }
9947                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9948                                         }
9949                                         net->fast_retran_ip = 0;
9950                                 } else {
9951                                         if (net->flight_size == 0) {
9952                                                 /*
9953                                                  * Should be decaying the
9954                                                  * cwnd here
9955                                                  */
9956                                                 ;
9957                                         }
9958                                 }
9959                         }
9960                 }
9961
9962         }
9963         burst_cnt = 0;
9964         do {
9965                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9966                     &reason_code, 0, from_where,
9967                     &now, &now_filled, frag_point, so_locked);
9968                 if (error) {
9969                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9970                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9971                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9972                         }
9973                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9974                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9975                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9976                         }
9977                         break;
9978                 }
9979                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9980
9981                 tot_out += num_out;
9982                 burst_cnt++;
9983                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9984                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9985                         if (num_out == 0) {
9986                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9987                         }
9988                 }
9989                 if (nagle_on) {
9990                         /*
9991                          * When the Nagle algorithm is used, look at how
9992                          * much is unsent, then if its smaller than an MTU
9993                          * and we have data in flight we stop, except if we
9994                          * are handling a fragmented user message.
9995                          */
9996                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9997                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9998                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9999                             (stcb->asoc.total_flight > 0) &&
10000                             ((stcb->asoc.locked_on_sending == NULL) ||
10001                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10002                                 break;
10003                         }
10004                 }
10005                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10006                     TAILQ_EMPTY(&asoc->send_queue) &&
10007                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10008                         /* Nothing left to send */
10009                         break;
10010                 }
10011                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10012                         /* Nothing left to send */
10013                         break;
10014                 }
10015         } while (num_out &&
10016             ((asoc->max_burst == 0) ||
10017             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10018             (burst_cnt < asoc->max_burst)));
10019
10020         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10021                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10022                         SCTP_STAT_INCR(sctps_maxburstqueued);
10023                         asoc->burst_limit_applied = 1;
10024                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10025                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10026                         }
10027                 } else {
10028                         asoc->burst_limit_applied = 0;
10029                 }
10030         }
10031         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10032                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10033         }
10034         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10035             tot_out);
10036
10037         /*-
10038          * Now we need to clean up the control chunk chain if a ECNE is on
10039          * it. It must be marked as UNSENT again so next call will continue
10040          * to send it until such time that we get a CWR, to remove it.
10041          */
10042         if (stcb->asoc.ecn_echo_cnt_onq)
10043                 sctp_fix_ecn_echo(asoc);
10044         return;
10045 }
10046
10047
10048 int
10049 sctp_output(
10050     struct sctp_inpcb *inp,
10051     struct mbuf *m,
10052     struct sockaddr *addr,
10053     struct mbuf *control,
10054     struct thread *p,
10055     int flags)
10056 {
10057         if (inp == NULL) {
10058                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10059                 return (EINVAL);
10060         }
10061         if (inp->sctp_socket == NULL) {
10062                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10063                 return (EINVAL);
10064         }
10065         return (sctp_sosend(inp->sctp_socket,
10066             addr,
10067             (struct uio *)NULL,
10068             m,
10069             control,
10070             flags, p
10071             ));
10072 }
10073
10074 void
10075 send_forward_tsn(struct sctp_tcb *stcb,
10076     struct sctp_association *asoc)
10077 {
10078         struct sctp_tmit_chunk *chk;
10079         struct sctp_forward_tsn_chunk *fwdtsn;
10080         uint32_t advance_peer_ack_point;
10081
10082         SCTP_TCB_LOCK_ASSERT(stcb);
10083         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10084                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10085                         /* mark it to unsent */
10086                         chk->sent = SCTP_DATAGRAM_UNSENT;
10087                         chk->snd_count = 0;
10088                         /* Do we correct its output location? */
10089                         if (chk->whoTo) {
10090                                 sctp_free_remote_addr(chk->whoTo);
10091                                 chk->whoTo = NULL;
10092                         }
10093                         goto sctp_fill_in_rest;
10094                 }
10095         }
10096         /* Ok if we reach here we must build one */
10097         sctp_alloc_a_chunk(stcb, chk);
10098         if (chk == NULL) {
10099                 return;
10100         }
10101         asoc->fwd_tsn_cnt++;
10102         chk->copy_by_ref = 0;
10103         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10104         chk->rec.chunk_id.can_take_data = 0;
10105         chk->asoc = asoc;
10106         chk->whoTo = NULL;
10107         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10108         if (chk->data == NULL) {
10109                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10110                 return;
10111         }
10112         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10113         chk->sent = SCTP_DATAGRAM_UNSENT;
10114         chk->snd_count = 0;
10115         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10116         asoc->ctrl_queue_cnt++;
10117 sctp_fill_in_rest:
10118         /*-
10119          * Here we go through and fill out the part that deals with
10120          * stream/seq of the ones we skip.
10121          */
10122         SCTP_BUF_LEN(chk->data) = 0;
10123         {
10124                 struct sctp_tmit_chunk *at, *tp1, *last;
10125                 struct sctp_strseq *strseq;
10126                 unsigned int cnt_of_space, i, ovh;
10127                 unsigned int space_needed;
10128                 unsigned int cnt_of_skipped = 0;
10129
10130                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10131                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10132                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10133                                 /* no more to look at */
10134                                 break;
10135                         }
10136                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10137                                 /* We don't report these */
10138                                 continue;
10139                         }
10140                         cnt_of_skipped++;
10141                 }
10142                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10143                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10144
10145                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10146
10147                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10148                         ovh = SCTP_MIN_OVERHEAD;
10149                 } else {
10150                         ovh = SCTP_MIN_V4_OVERHEAD;
10151                 }
10152                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10153                         /* trim to a mtu size */
10154                         cnt_of_space = asoc->smallest_mtu - ovh;
10155                 }
10156                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10157                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10158                             0xff, 0, cnt_of_skipped,
10159                             asoc->advanced_peer_ack_point);
10160
10161                 }
10162                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10163                 if (cnt_of_space < space_needed) {
10164                         /*-
10165                          * ok we must trim down the chunk by lowering the
10166                          * advance peer ack point.
10167                          */
10168                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10169                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10170                                     0xff, 0xff, cnt_of_space,
10171                                     space_needed);
10172                         }
10173                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10174                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10175                         /*-
10176                          * Go through and find the TSN that will be the one
10177                          * we report.
10178                          */
10179                         at = TAILQ_FIRST(&asoc->sent_queue);
10180                         if (at != NULL) {
10181                                 for (i = 0; i < cnt_of_skipped; i++) {
10182                                         tp1 = TAILQ_NEXT(at, sctp_next);
10183                                         if (tp1 == NULL) {
10184                                                 break;
10185                                         }
10186                                         at = tp1;
10187                                 }
10188                         }
10189                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10190                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10191                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10192                                     asoc->advanced_peer_ack_point);
10193                         }
10194                         last = at;
10195                         /*-
10196                          * last now points to last one I can report, update
10197                          * peer ack point
10198                          */
10199                         if (last)
10200                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10201                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10202                             cnt_of_skipped * sizeof(struct sctp_strseq);
10203                 }
10204                 chk->send_size = space_needed;
10205                 /* Setup the chunk */
10206                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10207                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10208                 fwdtsn->ch.chunk_flags = 0;
10209                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10210                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10211                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10212                 fwdtsn++;
10213                 /*-
10214                  * Move pointer to after the fwdtsn and transfer to the
10215                  * strseq pointer.
10216                  */
10217                 strseq = (struct sctp_strseq *)fwdtsn;
10218                 /*-
10219                  * Now populate the strseq list. This is done blindly
10220                  * without pulling out duplicate stream info. This is
10221                  * inefficent but won't harm the process since the peer will
10222                  * look at these in sequence and will thus release anything.
10223                  * It could mean we exceed the PMTU and chop off some that
10224                  * we could have included.. but this is unlikely (aka 1432/4
10225                  * would mean 300+ stream seq's would have to be reported in
10226                  * one FWD-TSN. With a bit of work we can later FIX this to
10227                  * optimize and pull out duplcates.. but it does add more
10228                  * overhead. So for now... not!
10229                  */
10230                 at = TAILQ_FIRST(&asoc->sent_queue);
10231                 for (i = 0; i < cnt_of_skipped; i++) {
10232                         tp1 = TAILQ_NEXT(at, sctp_next);
10233                         if (tp1 == NULL)
10234                                 break;
10235                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10236                                 /* We don't report these */
10237                                 i--;
10238                                 at = tp1;
10239                                 continue;
10240                         }
10241                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10242                                 at->rec.data.fwd_tsn_cnt = 0;
10243                         }
10244                         strseq->stream = ntohs(at->rec.data.stream_number);
10245                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10246                         strseq++;
10247                         at = tp1;
10248                 }
10249         }
10250         return;
10251 }
10252
10253 void
10254 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10255 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10256     SCTP_UNUSED
10257 #endif
10258 )
10259 {
10260         /*-
10261          * Queue up a SACK or NR-SACK in the control queue.
10262          * We must first check to see if a SACK or NR-SACK is
10263          * somehow on the control queue.
10264          * If so, we will take and and remove the old one.
10265          */
10266         struct sctp_association *asoc;
10267         struct sctp_tmit_chunk *chk, *a_chk;
10268         struct sctp_sack_chunk *sack;
10269         struct sctp_nr_sack_chunk *nr_sack;
10270         struct sctp_gap_ack_block *gap_descriptor;
10271         struct sack_track *selector;
10272         int mergeable = 0;
10273         int offset;
10274         caddr_t limit;
10275         uint32_t *dup;
10276         int limit_reached = 0;
10277         unsigned int i, siz, j;
10278         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10279         int num_dups = 0;
10280         int space_req;
10281         uint32_t highest_tsn;
10282         uint8_t flags;
10283         uint8_t type;
10284         uint8_t tsn_map;
10285
10286         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10287             (stcb->asoc.peer_supports_nr_sack == 1)) {
10288                 type = SCTP_NR_SELECTIVE_ACK;
10289         } else {
10290                 type = SCTP_SELECTIVE_ACK;
10291         }
10292         a_chk = NULL;
10293         asoc = &stcb->asoc;
10294         SCTP_TCB_LOCK_ASSERT(stcb);
10295         if (asoc->last_data_chunk_from == NULL) {
10296                 /* Hmm we never received anything */
10297                 return;
10298         }
10299         sctp_slide_mapping_arrays(stcb);
10300         sctp_set_rwnd(stcb, asoc);
10301         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10302                 if (chk->rec.chunk_id.id == type) {
10303                         /* Hmm, found a sack already on queue, remove it */
10304                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10305                         asoc->ctrl_queue_cnt--;
10306                         a_chk = chk;
10307                         if (a_chk->data) {
10308                                 sctp_m_freem(a_chk->data);
10309                                 a_chk->data = NULL;
10310                         }
10311                         if (a_chk->whoTo) {
10312                                 sctp_free_remote_addr(a_chk->whoTo);
10313                                 a_chk->whoTo = NULL;
10314                         }
10315                         break;
10316                 }
10317         }
10318         if (a_chk == NULL) {
10319                 sctp_alloc_a_chunk(stcb, a_chk);
10320                 if (a_chk == NULL) {
10321                         /* No memory so we drop the idea, and set a timer */
10322                         if (stcb->asoc.delayed_ack) {
10323                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10324                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10325                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10326                                     stcb->sctp_ep, stcb, NULL);
10327                         } else {
10328                                 stcb->asoc.send_sack = 1;
10329                         }
10330                         return;
10331                 }
10332                 a_chk->copy_by_ref = 0;
10333                 a_chk->rec.chunk_id.id = type;
10334                 a_chk->rec.chunk_id.can_take_data = 1;
10335         }
10336         /* Clear our pkt counts */
10337         asoc->data_pkts_seen = 0;
10338
10339         a_chk->asoc = asoc;
10340         a_chk->snd_count = 0;
10341         a_chk->send_size = 0;   /* fill in later */
10342         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10343         a_chk->whoTo = NULL;
10344
10345         if ((asoc->numduptsns) ||
10346             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10347                 /*-
10348                  * Ok, we have some duplicates or the destination for the
10349                  * sack is unreachable, lets see if we can select an
10350                  * alternate than asoc->last_data_chunk_from
10351                  */
10352                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10353                     (asoc->used_alt_onsack > asoc->numnets)) {
10354                         /* We used an alt last time, don't this time */
10355                         a_chk->whoTo = NULL;
10356                 } else {
10357                         asoc->used_alt_onsack++;
10358                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10359                 }
10360                 if (a_chk->whoTo == NULL) {
10361                         /* Nope, no alternate */
10362                         a_chk->whoTo = asoc->last_data_chunk_from;
10363                         asoc->used_alt_onsack = 0;
10364                 }
10365         } else {
10366                 /*
10367                  * No duplicates so we use the last place we received data
10368                  * from.
10369                  */
10370                 asoc->used_alt_onsack = 0;
10371                 a_chk->whoTo = asoc->last_data_chunk_from;
10372         }
10373         if (a_chk->whoTo) {
10374                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10375         }
10376         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10377                 highest_tsn = asoc->highest_tsn_inside_map;
10378         } else {
10379                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10380         }
10381         if (highest_tsn == asoc->cumulative_tsn) {
10382                 /* no gaps */
10383                 if (type == SCTP_SELECTIVE_ACK) {
10384                         space_req = sizeof(struct sctp_sack_chunk);
10385                 } else {
10386                         space_req = sizeof(struct sctp_nr_sack_chunk);
10387                 }
10388         } else {
10389                 /* gaps get a cluster */
10390                 space_req = MCLBYTES;
10391         }
10392         /* Ok now lets formulate a MBUF with our sack */
10393         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10394         if ((a_chk->data == NULL) ||
10395             (a_chk->whoTo == NULL)) {
10396                 /* rats, no mbuf memory */
10397                 if (a_chk->data) {
10398                         /* was a problem with the destination */
10399                         sctp_m_freem(a_chk->data);
10400                         a_chk->data = NULL;
10401                 }
10402                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10403                 /* sa_ignore NO_NULL_CHK */
10404                 if (stcb->asoc.delayed_ack) {
10405                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10406                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10407                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10408                             stcb->sctp_ep, stcb, NULL);
10409                 } else {
10410                         stcb->asoc.send_sack = 1;
10411                 }
10412                 return;
10413         }
10414         /* ok, lets go through and fill it in */
10415         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10416         space = M_TRAILINGSPACE(a_chk->data);
10417         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10418                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10419         }
10420         limit = mtod(a_chk->data, caddr_t);
10421         limit += space;
10422
10423         flags = 0;
10424
10425         if ((asoc->sctp_cmt_on_off > 0) &&
10426             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10427                 /*-
10428                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10429                  * received, then set high bit to 1, else 0. Reset
10430                  * pkts_rcvd.
10431                  */
10432                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10433                 asoc->cmt_dac_pkts_rcvd = 0;
10434         }
10435 #ifdef SCTP_ASOCLOG_OF_TSNS
10436         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10437         stcb->asoc.cumack_log_atsnt++;
10438         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10439                 stcb->asoc.cumack_log_atsnt = 0;
10440         }
10441 #endif
10442         /* reset the readers interpretation */
10443         stcb->freed_by_sorcv_sincelast = 0;
10444
10445         if (type == SCTP_SELECTIVE_ACK) {
10446                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10447                 nr_sack = NULL;
10448                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10449                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10450                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10451                 } else {
10452                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10453                 }
10454         } else {
10455                 sack = NULL;
10456                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10457                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10458                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10459                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10460                 } else {
10461                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10462                 }
10463         }
10464
10465         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10466                 offset = 1;
10467         } else {
10468                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10469         }
10470         if (((type == SCTP_SELECTIVE_ACK) &&
10471             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10472             ((type == SCTP_NR_SELECTIVE_ACK) &&
10473             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10474                 /* we have a gap .. maybe */
10475                 for (i = 0; i < siz; i++) {
10476                         tsn_map = asoc->mapping_array[i];
10477                         if (type == SCTP_SELECTIVE_ACK) {
10478                                 tsn_map |= asoc->nr_mapping_array[i];
10479                         }
10480                         if (i == 0) {
10481                                 /*
10482                                  * Clear all bits corresponding to TSNs
10483                                  * smaller or equal to the cumulative TSN.
10484                                  */
10485                                 tsn_map &= (~0 << (1 - offset));
10486                         }
10487                         selector = &sack_array[tsn_map];
10488                         if (mergeable && selector->right_edge) {
10489                                 /*
10490                                  * Backup, left and right edges were ok to
10491                                  * merge.
10492                                  */
10493                                 num_gap_blocks--;
10494                                 gap_descriptor--;
10495                         }
10496                         if (selector->num_entries == 0)
10497                                 mergeable = 0;
10498                         else {
10499                                 for (j = 0; j < selector->num_entries; j++) {
10500                                         if (mergeable && selector->right_edge) {
10501                                                 /*
10502                                                  * do a merge by NOT setting
10503                                                  * the left side
10504                                                  */
10505                                                 mergeable = 0;
10506                                         } else {
10507                                                 /*
10508                                                  * no merge, set the left
10509                                                  * side
10510                                                  */
10511                                                 mergeable = 0;
10512                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10513                                         }
10514                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10515                                         num_gap_blocks++;
10516                                         gap_descriptor++;
10517                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10518                                                 /* no more room */
10519                                                 limit_reached = 1;
10520                                                 break;
10521                                         }
10522                                 }
10523                                 if (selector->left_edge) {
10524                                         mergeable = 1;
10525                                 }
10526                         }
10527                         if (limit_reached) {
10528                                 /* Reached the limit stop */
10529                                 break;
10530                         }
10531                         offset += 8;
10532                 }
10533         }
10534         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10535             (limit_reached == 0)) {
10536
10537                 mergeable = 0;
10538
10539                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10540                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10541                 } else {
10542                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10543                 }
10544
10545                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10546                         offset = 1;
10547                 } else {
10548                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10549                 }
10550                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10551                         /* we have a gap .. maybe */
10552                         for (i = 0; i < siz; i++) {
10553                                 tsn_map = asoc->nr_mapping_array[i];
10554                                 if (i == 0) {
10555                                         /*
10556                                          * Clear all bits corresponding to
10557                                          * TSNs smaller or equal to the
10558                                          * cumulative TSN.
10559                                          */
10560                                         tsn_map &= (~0 << (1 - offset));
10561                                 }
10562                                 selector = &sack_array[tsn_map];
10563                                 if (mergeable && selector->right_edge) {
10564                                         /*
10565                                          * Backup, left and right edges were
10566                                          * ok to merge.
10567                                          */
10568                                         num_nr_gap_blocks--;
10569                                         gap_descriptor--;
10570                                 }
10571                                 if (selector->num_entries == 0)
10572                                         mergeable = 0;
10573                                 else {
10574                                         for (j = 0; j < selector->num_entries; j++) {
10575                                                 if (mergeable && selector->right_edge) {
10576                                                         /*
10577                                                          * do a merge by NOT
10578                                                          * setting the left
10579                                                          * side
10580                                                          */
10581                                                         mergeable = 0;
10582                                                 } else {
10583                                                         /*
10584                                                          * no merge, set the
10585                                                          * left side
10586                                                          */
10587                                                         mergeable = 0;
10588                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10589                                                 }
10590                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10591                                                 num_nr_gap_blocks++;
10592                                                 gap_descriptor++;
10593                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10594                                                         /* no more room */
10595                                                         limit_reached = 1;
10596                                                         break;
10597                                                 }
10598                                         }
10599                                         if (selector->left_edge) {
10600                                                 mergeable = 1;
10601                                         }
10602                                 }
10603                                 if (limit_reached) {
10604                                         /* Reached the limit stop */
10605                                         break;
10606                                 }
10607                                 offset += 8;
10608                         }
10609                 }
10610         }
10611         /* now we must add any dups we are going to report. */
10612         if ((limit_reached == 0) && (asoc->numduptsns)) {
10613                 dup = (uint32_t *) gap_descriptor;
10614                 for (i = 0; i < asoc->numduptsns; i++) {
10615                         *dup = htonl(asoc->dup_tsns[i]);
10616                         dup++;
10617                         num_dups++;
10618                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10619                                 /* no more room */
10620                                 break;
10621                         }
10622                 }
10623                 asoc->numduptsns = 0;
10624         }
10625         /*
10626          * now that the chunk is prepared queue it to the control chunk
10627          * queue.
10628          */
10629         if (type == SCTP_SELECTIVE_ACK) {
10630                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10631                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10632                     num_dups * sizeof(int32_t);
10633                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10634                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10635                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10636                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10637                 sack->sack.num_dup_tsns = htons(num_dups);
10638                 sack->ch.chunk_type = type;
10639                 sack->ch.chunk_flags = flags;
10640                 sack->ch.chunk_length = htons(a_chk->send_size);
10641         } else {
10642                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10643                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10644                     num_dups * sizeof(int32_t);
10645                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10646                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10647                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10648                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10649                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10650                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10651                 nr_sack->nr_sack.reserved = 0;
10652                 nr_sack->ch.chunk_type = type;
10653                 nr_sack->ch.chunk_flags = flags;
10654                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10655         }
10656         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10657         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10658         asoc->ctrl_queue_cnt++;
10659         asoc->send_sack = 0;
10660         SCTP_STAT_INCR(sctps_sendsacks);
10661         return;
10662 }
10663
10664 void
10665 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10666 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10667     SCTP_UNUSED
10668 #endif
10669 )
10670 {
10671         struct mbuf *m_abort, *m, *m_last;
10672         struct mbuf *m_out, *m_end = NULL;
10673         struct sctp_abort_chunk *abort;
10674         struct sctp_auth_chunk *auth = NULL;
10675         struct sctp_nets *net;
10676         uint32_t vtag;
10677         uint32_t auth_offset = 0;
10678         uint16_t cause_len, chunk_len, padding_len;
10679
10680         SCTP_TCB_LOCK_ASSERT(stcb);
10681         /*-
10682          * Add an AUTH chunk, if chunk requires it and save the offset into
10683          * the chain for AUTH
10684          */
10685         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10686             stcb->asoc.peer_auth_chunks)) {
10687                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10688                     stcb, SCTP_ABORT_ASSOCIATION);
10689                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10690         } else {
10691                 m_out = NULL;
10692         }
10693         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10694         if (m_abort == NULL) {
10695                 if (m_out) {
10696                         sctp_m_freem(m_out);
10697                 }
10698                 if (operr) {
10699                         sctp_m_freem(operr);
10700                 }
10701                 return;
10702         }
10703         /* link in any error */
10704         SCTP_BUF_NEXT(m_abort) = operr;
10705         cause_len = 0;
10706         m_last = NULL;
10707         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10708                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10709                 if (SCTP_BUF_NEXT(m) == NULL) {
10710                         m_last = m;
10711                 }
10712         }
10713         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10714         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10715         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10716         if (m_out == NULL) {
10717                 /* NO Auth chunk prepended, so reserve space in front */
10718                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10719                 m_out = m_abort;
10720         } else {
10721                 /* Put AUTH chunk at the front of the chain */
10722                 SCTP_BUF_NEXT(m_end) = m_abort;
10723         }
10724         if (stcb->asoc.alternate) {
10725                 net = stcb->asoc.alternate;
10726         } else {
10727                 net = stcb->asoc.primary_destination;
10728         }
10729         /* Fill in the ABORT chunk header. */
10730         abort = mtod(m_abort, struct sctp_abort_chunk *);
10731         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10732         if (stcb->asoc.peer_vtag == 0) {
10733                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10734                 vtag = stcb->asoc.my_vtag;
10735                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10736         } else {
10737                 vtag = stcb->asoc.peer_vtag;
10738                 abort->ch.chunk_flags = 0;
10739         }
10740         abort->ch.chunk_length = htons(chunk_len);
10741         /* Add padding, if necessary. */
10742         if (padding_len > 0) {
10743                 if ((m_last == NULL) || sctp_add_pad_tombuf(m_last, padding_len)) {
10744                         sctp_m_freem(m_out);
10745                         return;
10746                 }
10747         }
10748         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10749             (struct sockaddr *)&net->ro._l_addr,
10750             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10751             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10752             stcb->asoc.primary_destination->port, NULL,
10753             0, 0,
10754             so_locked);
10755         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10756 }
10757
10758 void
10759 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10760     struct sctp_nets *net,
10761     int reflect_vtag)
10762 {
10763         /* formulate and SEND a SHUTDOWN-COMPLETE */
10764         struct mbuf *m_shutdown_comp;
10765         struct sctp_shutdown_complete_chunk *shutdown_complete;
10766         uint32_t vtag;
10767         uint8_t flags;
10768
10769         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10770         if (m_shutdown_comp == NULL) {
10771                 /* no mbuf's */
10772                 return;
10773         }
10774         if (reflect_vtag) {
10775                 flags = SCTP_HAD_NO_TCB;
10776                 vtag = stcb->asoc.my_vtag;
10777         } else {
10778                 flags = 0;
10779                 vtag = stcb->asoc.peer_vtag;
10780         }
10781         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10782         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10783         shutdown_complete->ch.chunk_flags = flags;
10784         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10785         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10786         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10787             (struct sockaddr *)&net->ro._l_addr,
10788             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10789             stcb->sctp_ep->sctp_lport, stcb->rport,
10790             htonl(vtag),
10791             net->port, NULL,
10792             0, 0,
10793             SCTP_SO_NOT_LOCKED);
10794         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10795         return;
10796 }
10797
10798 static void
10799 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10800     struct sctphdr *sh, uint32_t vtag,
10801     uint8_t type, struct mbuf *cause,
10802     uint8_t use_mflowid, uint32_t mflowid,
10803     uint32_t vrf_id, uint16_t port)
10804 {
10805         struct mbuf *o_pak;
10806         struct mbuf *mout;
10807         struct sctphdr *shout;
10808         struct sctp_chunkhdr *ch;
10809         struct udphdr *udp;
10810         int len, cause_len, padding_len, ret;
10811
10812 #ifdef INET
10813         struct sockaddr_in *src_sin, *dst_sin;
10814         struct ip *ip;
10815
10816 #endif
10817 #ifdef INET6
10818         struct sockaddr_in6 *src_sin6, *dst_sin6;
10819         struct ip6_hdr *ip6;
10820
10821 #endif
10822
10823         /* Compute the length of the cause and add final padding. */
10824         cause_len = 0;
10825         if (cause != NULL) {
10826                 struct mbuf *m_at, *m_last = NULL;
10827
10828                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10829                         if (SCTP_BUF_NEXT(m_at) == NULL)
10830                                 m_last = m_at;
10831                         cause_len += SCTP_BUF_LEN(m_at);
10832                 }
10833                 padding_len = cause_len % 4;
10834                 if (padding_len != 0) {
10835                         padding_len = 4 - padding_len;
10836                 }
10837                 if (padding_len != 0) {
10838                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10839                                 sctp_m_freem(cause);
10840                                 return;
10841                         }
10842                 }
10843         } else {
10844                 padding_len = 0;
10845         }
10846         /* Get an mbuf for the header. */
10847         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10848         switch (dst->sa_family) {
10849 #ifdef INET
10850         case AF_INET:
10851                 len += sizeof(struct ip);
10852                 break;
10853 #endif
10854 #ifdef INET6
10855         case AF_INET6:
10856                 len += sizeof(struct ip6_hdr);
10857                 break;
10858 #endif
10859         default:
10860                 break;
10861         }
10862         if (port) {
10863                 len += sizeof(struct udphdr);
10864         }
10865         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10866         if (mout == NULL) {
10867                 if (cause) {
10868                         sctp_m_freem(cause);
10869                 }
10870                 return;
10871         }
10872         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10873         SCTP_BUF_LEN(mout) = len;
10874         SCTP_BUF_NEXT(mout) = cause;
10875         if (use_mflowid != 0) {
10876                 mout->m_pkthdr.flowid = mflowid;
10877                 mout->m_flags |= M_FLOWID;
10878         }
10879 #ifdef INET
10880         ip = NULL;
10881 #endif
10882 #ifdef INET6
10883         ip6 = NULL;
10884 #endif
10885         switch (dst->sa_family) {
10886 #ifdef INET
10887         case AF_INET:
10888                 src_sin = (struct sockaddr_in *)src;
10889                 dst_sin = (struct sockaddr_in *)dst;
10890                 ip = mtod(mout, struct ip *);
10891                 ip->ip_v = IPVERSION;
10892                 ip->ip_hl = (sizeof(struct ip) >> 2);
10893                 ip->ip_tos = 0;
10894                 ip->ip_id = ip_newid();
10895                 ip->ip_off = 0;
10896                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10897                 if (port) {
10898                         ip->ip_p = IPPROTO_UDP;
10899                 } else {
10900                         ip->ip_p = IPPROTO_SCTP;
10901                 }
10902                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10903                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10904                 ip->ip_sum = 0;
10905                 len = sizeof(struct ip);
10906                 shout = (struct sctphdr *)((caddr_t)ip + len);
10907                 break;
10908 #endif
10909 #ifdef INET6
10910         case AF_INET6:
10911                 src_sin6 = (struct sockaddr_in6 *)src;
10912                 dst_sin6 = (struct sockaddr_in6 *)dst;
10913                 ip6 = mtod(mout, struct ip6_hdr *);
10914                 ip6->ip6_flow = htonl(0x60000000);
10915                 if (V_ip6_auto_flowlabel) {
10916                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10917                 }
10918                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10919                 if (port) {
10920                         ip6->ip6_nxt = IPPROTO_UDP;
10921                 } else {
10922                         ip6->ip6_nxt = IPPROTO_SCTP;
10923                 }
10924                 ip6->ip6_src = dst_sin6->sin6_addr;
10925                 ip6->ip6_dst = src_sin6->sin6_addr;
10926                 len = sizeof(struct ip6_hdr);
10927                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
10928                 break;
10929 #endif
10930         default:
10931                 len = 0;
10932                 shout = mtod(mout, struct sctphdr *);
10933                 break;
10934         }
10935         if (port) {
10936                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10937                         sctp_m_freem(mout);
10938                         return;
10939                 }
10940                 udp = (struct udphdr *)shout;
10941                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10942                 udp->uh_dport = port;
10943                 udp->uh_sum = 0;
10944                 udp->uh_ulen = htons(sizeof(struct udphdr) +
10945                     sizeof(struct sctphdr) +
10946                     sizeof(struct sctp_chunkhdr) +
10947                     cause_len + padding_len);
10948                 len += sizeof(struct udphdr);
10949                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
10950         } else {
10951                 udp = NULL;
10952         }
10953         shout->src_port = sh->dest_port;
10954         shout->dest_port = sh->src_port;
10955         shout->checksum = 0;
10956         if (vtag) {
10957                 shout->v_tag = htonl(vtag);
10958         } else {
10959                 shout->v_tag = sh->v_tag;
10960         }
10961         len += sizeof(struct sctphdr);
10962         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
10963         ch->chunk_type = type;
10964         if (vtag) {
10965                 ch->chunk_flags = 0;
10966         } else {
10967                 ch->chunk_flags = SCTP_HAD_NO_TCB;
10968         }
10969         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
10970         len += sizeof(struct sctp_chunkhdr);
10971         len += cause_len + padding_len;
10972
10973         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10974                 sctp_m_freem(mout);
10975                 return;
10976         }
10977         SCTP_ATTACH_CHAIN(o_pak, mout, len);
10978         switch (dst->sa_family) {
10979 #ifdef INET
10980         case AF_INET:
10981                 if (port) {
10982                         if (V_udp_cksum) {
10983                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10984                         } else {
10985                                 udp->uh_sum = 0;
10986                         }
10987                 }
10988                 ip->ip_len = len;
10989                 if (port) {
10990 #if defined(SCTP_WITH_NO_CSUM)
10991                         SCTP_STAT_INCR(sctps_sendnocrc);
10992 #else
10993                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
10994                         SCTP_STAT_INCR(sctps_sendswcrc);
10995 #endif
10996                         if (V_udp_cksum) {
10997                                 SCTP_ENABLE_UDP_CSUM(o_pak);
10998                         }
10999                 } else {
11000 #if defined(SCTP_WITH_NO_CSUM)
11001                         SCTP_STAT_INCR(sctps_sendnocrc);
11002 #else
11003                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11004                         mout->m_pkthdr.csum_data = 0;
11005                         SCTP_STAT_INCR(sctps_sendhwcrc);
11006 #endif
11007                 }
11008 #ifdef SCTP_PACKET_LOGGING
11009                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11010                         sctp_packet_log(o_pak);
11011                 }
11012 #endif
11013                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11014                 break;
11015 #endif
11016 #ifdef INET6
11017         case AF_INET6:
11018                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11019                 if (port) {
11020 #if defined(SCTP_WITH_NO_CSUM)
11021                         SCTP_STAT_INCR(sctps_sendnocrc);
11022 #else
11023                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11024                         SCTP_STAT_INCR(sctps_sendswcrc);
11025 #endif
11026                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11027                                 udp->uh_sum = 0xffff;
11028                         }
11029                 } else {
11030 #if defined(SCTP_WITH_NO_CSUM)
11031                         SCTP_STAT_INCR(sctps_sendnocrc);
11032 #else
11033                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11034                         mout->m_pkthdr.csum_data = 0;
11035                         SCTP_STAT_INCR(sctps_sendhwcrc);
11036 #endif
11037                 }
11038 #ifdef SCTP_PACKET_LOGGING
11039                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11040                         sctp_packet_log(o_pak);
11041                 }
11042 #endif
11043                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11044                 break;
11045 #endif
11046         default:
11047                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11048                     dst->sa_family);
11049                 sctp_m_freem(mout);
11050                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11051                 return;
11052         }
11053         SCTP_STAT_INCR(sctps_sendpackets);
11054         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11055         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11056         return;
11057 }
11058
11059 void
11060 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11061     struct sctphdr *sh,
11062     uint8_t use_mflowid, uint32_t mflowid,
11063     uint32_t vrf_id, uint16_t port)
11064 {
11065         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11066             use_mflowid, mflowid,
11067             vrf_id, port);
11068 }
11069
11070 void
11071 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11072 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11073     SCTP_UNUSED
11074 #endif
11075 )
11076 {
11077         struct sctp_tmit_chunk *chk;
11078         struct sctp_heartbeat_chunk *hb;
11079         struct timeval now;
11080
11081         SCTP_TCB_LOCK_ASSERT(stcb);
11082         if (net == NULL) {
11083                 return;
11084         }
11085         (void)SCTP_GETTIME_TIMEVAL(&now);
11086         switch (net->ro._l_addr.sa.sa_family) {
11087 #ifdef INET
11088         case AF_INET:
11089                 break;
11090 #endif
11091 #ifdef INET6
11092         case AF_INET6:
11093                 break;
11094 #endif
11095         default:
11096                 return;
11097         }
11098         sctp_alloc_a_chunk(stcb, chk);
11099         if (chk == NULL) {
11100                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11101                 return;
11102         }
11103         chk->copy_by_ref = 0;
11104         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11105         chk->rec.chunk_id.can_take_data = 1;
11106         chk->asoc = &stcb->asoc;
11107         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11108
11109         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11110         if (chk->data == NULL) {
11111                 sctp_free_a_chunk(stcb, chk, so_locked);
11112                 return;
11113         }
11114         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11115         SCTP_BUF_LEN(chk->data) = chk->send_size;
11116         chk->sent = SCTP_DATAGRAM_UNSENT;
11117         chk->snd_count = 0;
11118         chk->whoTo = net;
11119         atomic_add_int(&chk->whoTo->ref_count, 1);
11120         /* Now we have a mbuf that we can fill in with the details */
11121         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11122         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11123         /* fill out chunk header */
11124         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11125         hb->ch.chunk_flags = 0;
11126         hb->ch.chunk_length = htons(chk->send_size);
11127         /* Fill out hb parameter */
11128         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11129         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11130         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11131         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11132         /* Did our user request this one, put it in */
11133         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11134         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11135         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11136                 /*
11137                  * we only take from the entropy pool if the address is not
11138                  * confirmed.
11139                  */
11140                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11141                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11142         } else {
11143                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11144                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11145         }
11146         switch (net->ro._l_addr.sa.sa_family) {
11147 #ifdef INET
11148         case AF_INET:
11149                 memcpy(hb->heartbeat.hb_info.address,
11150                     &net->ro._l_addr.sin.sin_addr,
11151                     sizeof(net->ro._l_addr.sin.sin_addr));
11152                 break;
11153 #endif
11154 #ifdef INET6
11155         case AF_INET6:
11156                 memcpy(hb->heartbeat.hb_info.address,
11157                     &net->ro._l_addr.sin6.sin6_addr,
11158                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11159                 break;
11160 #endif
11161         default:
11162                 return;
11163                 break;
11164         }
11165         net->hb_responded = 0;
11166         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11167         stcb->asoc.ctrl_queue_cnt++;
11168         SCTP_STAT_INCR(sctps_sendheartbeat);
11169         return;
11170 }
11171
11172 void
11173 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11174     uint32_t high_tsn)
11175 {
11176         struct sctp_association *asoc;
11177         struct sctp_ecne_chunk *ecne;
11178         struct sctp_tmit_chunk *chk;
11179
11180         if (net == NULL) {
11181                 return;
11182         }
11183         asoc = &stcb->asoc;
11184         SCTP_TCB_LOCK_ASSERT(stcb);
11185         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11186                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11187                         /* found a previous ECN_ECHO update it if needed */
11188                         uint32_t cnt, ctsn;
11189
11190                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11191                         ctsn = ntohl(ecne->tsn);
11192                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11193                                 ecne->tsn = htonl(high_tsn);
11194                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11195                         }
11196                         cnt = ntohl(ecne->num_pkts_since_cwr);
11197                         cnt++;
11198                         ecne->num_pkts_since_cwr = htonl(cnt);
11199                         return;
11200                 }
11201         }
11202         /* nope could not find one to update so we must build one */
11203         sctp_alloc_a_chunk(stcb, chk);
11204         if (chk == NULL) {
11205                 return;
11206         }
11207         chk->copy_by_ref = 0;
11208         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11209         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11210         chk->rec.chunk_id.can_take_data = 0;
11211         chk->asoc = &stcb->asoc;
11212         chk->send_size = sizeof(struct sctp_ecne_chunk);
11213         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11214         if (chk->data == NULL) {
11215                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11216                 return;
11217         }
11218         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11219         SCTP_BUF_LEN(chk->data) = chk->send_size;
11220         chk->sent = SCTP_DATAGRAM_UNSENT;
11221         chk->snd_count = 0;
11222         chk->whoTo = net;
11223         atomic_add_int(&chk->whoTo->ref_count, 1);
11224
11225         stcb->asoc.ecn_echo_cnt_onq++;
11226         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11227         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11228         ecne->ch.chunk_flags = 0;
11229         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11230         ecne->tsn = htonl(high_tsn);
11231         ecne->num_pkts_since_cwr = htonl(1);
11232         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11233         asoc->ctrl_queue_cnt++;
11234 }
11235
11236 void
11237 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11238     struct mbuf *m, int len, int iphlen, int bad_crc)
11239 {
11240         struct sctp_association *asoc;
11241         struct sctp_pktdrop_chunk *drp;
11242         struct sctp_tmit_chunk *chk;
11243         uint8_t *datap;
11244         int was_trunc = 0;
11245         int fullsz = 0;
11246         long spc;
11247         int offset;
11248         struct sctp_chunkhdr *ch, chunk_buf;
11249         unsigned int chk_length;
11250
11251         if (!stcb) {
11252                 return;
11253         }
11254         asoc = &stcb->asoc;
11255         SCTP_TCB_LOCK_ASSERT(stcb);
11256         if (asoc->peer_supports_pktdrop == 0) {
11257                 /*-
11258                  * peer must declare support before I send one.
11259                  */
11260                 return;
11261         }
11262         if (stcb->sctp_socket == NULL) {
11263                 return;
11264         }
11265         sctp_alloc_a_chunk(stcb, chk);
11266         if (chk == NULL) {
11267                 return;
11268         }
11269         chk->copy_by_ref = 0;
11270         len -= iphlen;
11271         chk->send_size = len;
11272         /* Validate that we do not have an ABORT in here. */
11273         offset = iphlen + sizeof(struct sctphdr);
11274         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11275             sizeof(*ch), (uint8_t *) & chunk_buf);
11276         while (ch != NULL) {
11277                 chk_length = ntohs(ch->chunk_length);
11278                 if (chk_length < sizeof(*ch)) {
11279                         /* break to abort land */
11280                         break;
11281                 }
11282                 switch (ch->chunk_type) {
11283                 case SCTP_PACKET_DROPPED:
11284                 case SCTP_ABORT_ASSOCIATION:
11285                 case SCTP_INITIATION_ACK:
11286                         /**
11287                          * We don't respond with an PKT-DROP to an ABORT
11288                          * or PKT-DROP. We also do not respond to an
11289                          * INIT-ACK, because we can't know if the initiation
11290                          * tag is correct or not.
11291                          */
11292                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11293                         return;
11294                 default:
11295                         break;
11296                 }
11297                 offset += SCTP_SIZE32(chk_length);
11298                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11299                     sizeof(*ch), (uint8_t *) & chunk_buf);
11300         }
11301
11302         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11303             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11304                 /*
11305                  * only send 1 mtu worth, trim off the excess on the end.
11306                  */
11307                 fullsz = len;
11308                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11309                 was_trunc = 1;
11310         }
11311         chk->asoc = &stcb->asoc;
11312         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11313         if (chk->data == NULL) {
11314 jump_out:
11315                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11316                 return;
11317         }
11318         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11319         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11320         if (drp == NULL) {
11321                 sctp_m_freem(chk->data);
11322                 chk->data = NULL;
11323                 goto jump_out;
11324         }
11325         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11326             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11327         chk->book_size_scale = 0;
11328         if (was_trunc) {
11329                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11330                 drp->trunc_len = htons(fullsz);
11331                 /*
11332                  * Len is already adjusted to size minus overhead above take
11333                  * out the pkt_drop chunk itself from it.
11334                  */
11335                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11336                 len = chk->send_size;
11337         } else {
11338                 /* no truncation needed */
11339                 drp->ch.chunk_flags = 0;
11340                 drp->trunc_len = htons(0);
11341         }
11342         if (bad_crc) {
11343                 drp->ch.chunk_flags |= SCTP_BADCRC;
11344         }
11345         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11346         SCTP_BUF_LEN(chk->data) = chk->send_size;
11347         chk->sent = SCTP_DATAGRAM_UNSENT;
11348         chk->snd_count = 0;
11349         if (net) {
11350                 /* we should hit here */
11351                 chk->whoTo = net;
11352                 atomic_add_int(&chk->whoTo->ref_count, 1);
11353         } else {
11354                 chk->whoTo = NULL;
11355         }
11356         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11357         chk->rec.chunk_id.can_take_data = 1;
11358         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11359         drp->ch.chunk_length = htons(chk->send_size);
11360         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11361         if (spc < 0) {
11362                 spc = 0;
11363         }
11364         drp->bottle_bw = htonl(spc);
11365         if (asoc->my_rwnd) {
11366                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11367                     asoc->size_on_all_streams +
11368                     asoc->my_rwnd_control_len +
11369                     stcb->sctp_socket->so_rcv.sb_cc);
11370         } else {
11371                 /*-
11372                  * If my rwnd is 0, possibly from mbuf depletion as well as
11373                  * space used, tell the peer there is NO space aka onq == bw
11374                  */
11375                 drp->current_onq = htonl(spc);
11376         }
11377         drp->reserved = 0;
11378         datap = drp->data;
11379         m_copydata(m, iphlen, len, (caddr_t)datap);
11380         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11381         asoc->ctrl_queue_cnt++;
11382 }
11383
11384 void
11385 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11386 {
11387         struct sctp_association *asoc;
11388         struct sctp_cwr_chunk *cwr;
11389         struct sctp_tmit_chunk *chk;
11390
11391         SCTP_TCB_LOCK_ASSERT(stcb);
11392         if (net == NULL) {
11393                 return;
11394         }
11395         asoc = &stcb->asoc;
11396         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11397                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11398                         /*
11399                          * found a previous CWR queued to same destination
11400                          * update it if needed
11401                          */
11402                         uint32_t ctsn;
11403
11404                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11405                         ctsn = ntohl(cwr->tsn);
11406                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11407                                 cwr->tsn = htonl(high_tsn);
11408                         }
11409                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11410                                 /* Make sure override is carried */
11411                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11412                         }
11413                         return;
11414                 }
11415         }
11416         sctp_alloc_a_chunk(stcb, chk);
11417         if (chk == NULL) {
11418                 return;
11419         }
11420         chk->copy_by_ref = 0;
11421         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11422         chk->rec.chunk_id.can_take_data = 1;
11423         chk->asoc = &stcb->asoc;
11424         chk->send_size = sizeof(struct sctp_cwr_chunk);
11425         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11426         if (chk->data == NULL) {
11427                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11428                 return;
11429         }
11430         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11431         SCTP_BUF_LEN(chk->data) = chk->send_size;
11432         chk->sent = SCTP_DATAGRAM_UNSENT;
11433         chk->snd_count = 0;
11434         chk->whoTo = net;
11435         atomic_add_int(&chk->whoTo->ref_count, 1);
11436         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11437         cwr->ch.chunk_type = SCTP_ECN_CWR;
11438         cwr->ch.chunk_flags = override;
11439         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11440         cwr->tsn = htonl(high_tsn);
11441         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11442         asoc->ctrl_queue_cnt++;
11443 }
11444
11445 void
11446 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11447     int number_entries, uint16_t * list,
11448     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11449 {
11450         uint16_t len, old_len, i;
11451         struct sctp_stream_reset_out_request *req_out;
11452         struct sctp_chunkhdr *ch;
11453
11454         ch = mtod(chk->data, struct sctp_chunkhdr *);
11455         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11456
11457         /* get to new offset for the param. */
11458         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11459         /* now how long will this param be? */
11460         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11461         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11462         req_out->ph.param_length = htons(len);
11463         req_out->request_seq = htonl(seq);
11464         req_out->response_seq = htonl(resp_seq);
11465         req_out->send_reset_at_tsn = htonl(last_sent);
11466         if (number_entries) {
11467                 for (i = 0; i < number_entries; i++) {
11468                         req_out->list_of_streams[i] = htons(list[i]);
11469                 }
11470         }
11471         if (SCTP_SIZE32(len) > len) {
11472                 /*-
11473                  * Need to worry about the pad we may end up adding to the
11474                  * end. This is easy since the struct is either aligned to 4
11475                  * bytes or 2 bytes off.
11476                  */
11477                 req_out->list_of_streams[number_entries] = 0;
11478         }
11479         /* now fix the chunk length */
11480         ch->chunk_length = htons(len + old_len);
11481         chk->book_size = len + old_len;
11482         chk->book_size_scale = 0;
11483         chk->send_size = SCTP_SIZE32(chk->book_size);
11484         SCTP_BUF_LEN(chk->data) = chk->send_size;
11485         return;
11486 }
11487
11488 static void
11489 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11490     int number_entries, uint16_t * list,
11491     uint32_t seq)
11492 {
11493         uint16_t len, old_len, i;
11494         struct sctp_stream_reset_in_request *req_in;
11495         struct sctp_chunkhdr *ch;
11496
11497         ch = mtod(chk->data, struct sctp_chunkhdr *);
11498         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11499
11500         /* get to new offset for the param. */
11501         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11502         /* now how long will this param be? */
11503         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11504         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11505         req_in->ph.param_length = htons(len);
11506         req_in->request_seq = htonl(seq);
11507         if (number_entries) {
11508                 for (i = 0; i < number_entries; i++) {
11509                         req_in->list_of_streams[i] = htons(list[i]);
11510                 }
11511         }
11512         if (SCTP_SIZE32(len) > len) {
11513                 /*-
11514                  * Need to worry about the pad we may end up adding to the
11515                  * end. This is easy since the struct is either aligned to 4
11516                  * bytes or 2 bytes off.
11517                  */
11518                 req_in->list_of_streams[number_entries] = 0;
11519         }
11520         /* now fix the chunk length */
11521         ch->chunk_length = htons(len + old_len);
11522         chk->book_size = len + old_len;
11523         chk->book_size_scale = 0;
11524         chk->send_size = SCTP_SIZE32(chk->book_size);
11525         SCTP_BUF_LEN(chk->data) = chk->send_size;
11526         return;
11527 }
11528
11529 static void
11530 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11531     uint32_t seq)
11532 {
11533         uint16_t len, old_len;
11534         struct sctp_stream_reset_tsn_request *req_tsn;
11535         struct sctp_chunkhdr *ch;
11536
11537         ch = mtod(chk->data, struct sctp_chunkhdr *);
11538         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11539
11540         /* get to new offset for the param. */
11541         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11542         /* now how long will this param be? */
11543         len = sizeof(struct sctp_stream_reset_tsn_request);
11544         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11545         req_tsn->ph.param_length = htons(len);
11546         req_tsn->request_seq = htonl(seq);
11547
11548         /* now fix the chunk length */
11549         ch->chunk_length = htons(len + old_len);
11550         chk->send_size = len + old_len;
11551         chk->book_size = SCTP_SIZE32(chk->send_size);
11552         chk->book_size_scale = 0;
11553         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11554         return;
11555 }
11556
11557 void
11558 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11559     uint32_t resp_seq, uint32_t result)
11560 {
11561         uint16_t len, old_len;
11562         struct sctp_stream_reset_response *resp;
11563         struct sctp_chunkhdr *ch;
11564
11565         ch = mtod(chk->data, struct sctp_chunkhdr *);
11566         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11567
11568         /* get to new offset for the param. */
11569         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11570         /* now how long will this param be? */
11571         len = sizeof(struct sctp_stream_reset_response);
11572         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11573         resp->ph.param_length = htons(len);
11574         resp->response_seq = htonl(resp_seq);
11575         resp->result = ntohl(result);
11576
11577         /* now fix the chunk length */
11578         ch->chunk_length = htons(len + old_len);
11579         chk->book_size = len + old_len;
11580         chk->book_size_scale = 0;
11581         chk->send_size = SCTP_SIZE32(chk->book_size);
11582         SCTP_BUF_LEN(chk->data) = chk->send_size;
11583         return;
11584 }
11585
11586 void
11587 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11588     uint32_t resp_seq, uint32_t result,
11589     uint32_t send_una, uint32_t recv_next)
11590 {
11591         uint16_t len, old_len;
11592         struct sctp_stream_reset_response_tsn *resp;
11593         struct sctp_chunkhdr *ch;
11594
11595         ch = mtod(chk->data, struct sctp_chunkhdr *);
11596         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11597
11598         /* get to new offset for the param. */
11599         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11600         /* now how long will this param be? */
11601         len = sizeof(struct sctp_stream_reset_response_tsn);
11602         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11603         resp->ph.param_length = htons(len);
11604         resp->response_seq = htonl(resp_seq);
11605         resp->result = htonl(result);
11606         resp->senders_next_tsn = htonl(send_una);
11607         resp->receivers_next_tsn = htonl(recv_next);
11608
11609         /* now fix the chunk length */
11610         ch->chunk_length = htons(len + old_len);
11611         chk->book_size = len + old_len;
11612         chk->send_size = SCTP_SIZE32(chk->book_size);
11613         chk->book_size_scale = 0;
11614         SCTP_BUF_LEN(chk->data) = chk->send_size;
11615         return;
11616 }
11617
11618 static void
11619 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11620     uint32_t seq,
11621     uint16_t adding)
11622 {
11623         uint16_t len, old_len;
11624         struct sctp_chunkhdr *ch;
11625         struct sctp_stream_reset_add_strm *addstr;
11626
11627         ch = mtod(chk->data, struct sctp_chunkhdr *);
11628         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11629
11630         /* get to new offset for the param. */
11631         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11632         /* now how long will this param be? */
11633         len = sizeof(struct sctp_stream_reset_add_strm);
11634
11635         /* Fill it out. */
11636         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11637         addstr->ph.param_length = htons(len);
11638         addstr->request_seq = htonl(seq);
11639         addstr->number_of_streams = htons(adding);
11640         addstr->reserved = 0;
11641
11642         /* now fix the chunk length */
11643         ch->chunk_length = htons(len + old_len);
11644         chk->send_size = len + old_len;
11645         chk->book_size = SCTP_SIZE32(chk->send_size);
11646         chk->book_size_scale = 0;
11647         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11648         return;
11649 }
11650
11651 static void
11652 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11653     uint32_t seq,
11654     uint16_t adding)
11655 {
11656         uint16_t len, old_len;
11657         struct sctp_chunkhdr *ch;
11658         struct sctp_stream_reset_add_strm *addstr;
11659
11660         ch = mtod(chk->data, struct sctp_chunkhdr *);
11661         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11662
11663         /* get to new offset for the param. */
11664         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11665         /* now how long will this param be? */
11666         len = sizeof(struct sctp_stream_reset_add_strm);
11667         /* Fill it out. */
11668         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11669         addstr->ph.param_length = htons(len);
11670         addstr->request_seq = htonl(seq);
11671         addstr->number_of_streams = htons(adding);
11672         addstr->reserved = 0;
11673
11674         /* now fix the chunk length */
11675         ch->chunk_length = htons(len + old_len);
11676         chk->send_size = len + old_len;
11677         chk->book_size = SCTP_SIZE32(chk->send_size);
11678         chk->book_size_scale = 0;
11679         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11680         return;
11681 }
11682
11683 int
11684 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11685     int number_entries, uint16_t * list,
11686     uint8_t send_out_req,
11687     uint8_t send_in_req,
11688     uint8_t send_tsn_req,
11689     uint8_t add_stream,
11690     uint16_t adding_o,
11691     uint16_t adding_i, uint8_t peer_asked)
11692 {
11693
11694         struct sctp_association *asoc;
11695         struct sctp_tmit_chunk *chk;
11696         struct sctp_chunkhdr *ch;
11697         uint32_t seq;
11698
11699         asoc = &stcb->asoc;
11700         if (asoc->stream_reset_outstanding) {
11701                 /*-
11702                  * Already one pending, must get ACK back to clear the flag.
11703                  */
11704                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11705                 return (EBUSY);
11706         }
11707         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11708             (add_stream == 0)) {
11709                 /* nothing to do */
11710                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11711                 return (EINVAL);
11712         }
11713         if (send_tsn_req && (send_out_req || send_in_req)) {
11714                 /* error, can't do that */
11715                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11716                 return (EINVAL);
11717         }
11718         sctp_alloc_a_chunk(stcb, chk);
11719         if (chk == NULL) {
11720                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11721                 return (ENOMEM);
11722         }
11723         chk->copy_by_ref = 0;
11724         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11725         chk->rec.chunk_id.can_take_data = 0;
11726         chk->asoc = &stcb->asoc;
11727         chk->book_size = sizeof(struct sctp_chunkhdr);
11728         chk->send_size = SCTP_SIZE32(chk->book_size);
11729         chk->book_size_scale = 0;
11730
11731         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11732         if (chk->data == NULL) {
11733                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11734                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11735                 return (ENOMEM);
11736         }
11737         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11738
11739         /* setup chunk parameters */
11740         chk->sent = SCTP_DATAGRAM_UNSENT;
11741         chk->snd_count = 0;
11742         if (stcb->asoc.alternate) {
11743                 chk->whoTo = stcb->asoc.alternate;
11744         } else {
11745                 chk->whoTo = stcb->asoc.primary_destination;
11746         }
11747         atomic_add_int(&chk->whoTo->ref_count, 1);
11748         ch = mtod(chk->data, struct sctp_chunkhdr *);
11749         ch->chunk_type = SCTP_STREAM_RESET;
11750         ch->chunk_flags = 0;
11751         ch->chunk_length = htons(chk->book_size);
11752         SCTP_BUF_LEN(chk->data) = chk->send_size;
11753
11754         seq = stcb->asoc.str_reset_seq_out;
11755         if (send_out_req) {
11756                 sctp_add_stream_reset_out(chk, number_entries, list,
11757                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11758                 asoc->stream_reset_out_is_outstanding = 1;
11759                 seq++;
11760                 asoc->stream_reset_outstanding++;
11761         }
11762         if ((add_stream & 1) &&
11763             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11764                 /* Need to allocate more */
11765                 struct sctp_stream_out *oldstream;
11766                 struct sctp_stream_queue_pending *sp, *nsp;
11767                 int i;
11768
11769                 oldstream = stcb->asoc.strmout;
11770                 /* get some more */
11771                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11772                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11773                     SCTP_M_STRMO);
11774                 if (stcb->asoc.strmout == NULL) {
11775                         uint8_t x;
11776
11777                         stcb->asoc.strmout = oldstream;
11778                         /* Turn off the bit */
11779                         x = add_stream & 0xfe;
11780                         add_stream = x;
11781                         goto skip_stuff;
11782                 }
11783                 /*
11784                  * Ok now we proceed with copying the old out stuff and
11785                  * initializing the new stuff.
11786                  */
11787                 SCTP_TCB_SEND_LOCK(stcb);
11788                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11789                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11790                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11791                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11792                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11793                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11794                         stcb->asoc.strmout[i].stream_no = i;
11795                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11796                         /* now anything on those queues? */
11797                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11798                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11799                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11800                         }
11801                         /* Now move assoc pointers too */
11802                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11803                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11804                         }
11805                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11806                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11807                         }
11808                 }
11809                 /* now the new streams */
11810                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11811                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11812                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11813                         stcb->asoc.strmout[i].chunks_on_queues = 0;
11814                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
11815                         stcb->asoc.strmout[i].stream_no = i;
11816                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11817                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11818                 }
11819                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11820                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11821                 SCTP_TCB_SEND_UNLOCK(stcb);
11822         }
11823 skip_stuff:
11824         if ((add_stream & 1) && (adding_o > 0)) {
11825                 asoc->strm_pending_add_size = adding_o;
11826                 asoc->peer_req_out = peer_asked;
11827                 sctp_add_an_out_stream(chk, seq, adding_o);
11828                 seq++;
11829                 asoc->stream_reset_outstanding++;
11830         }
11831         if ((add_stream & 2) && (adding_i > 0)) {
11832                 sctp_add_an_in_stream(chk, seq, adding_i);
11833                 seq++;
11834                 asoc->stream_reset_outstanding++;
11835         }
11836         if (send_in_req) {
11837                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11838                 seq++;
11839                 asoc->stream_reset_outstanding++;
11840         }
11841         if (send_tsn_req) {
11842                 sctp_add_stream_reset_tsn(chk, seq);
11843                 asoc->stream_reset_outstanding++;
11844         }
11845         asoc->str_reset = chk;
11846         /* insert the chunk for sending */
11847         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11848             chk,
11849             sctp_next);
11850         asoc->ctrl_queue_cnt++;
11851         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11852         return (0);
11853 }
11854
11855 void
11856 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11857     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11858     uint8_t use_mflowid, uint32_t mflowid,
11859     uint32_t vrf_id, uint16_t port)
11860 {
11861         /* Don't respond to an ABORT with an ABORT. */
11862         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11863                 if (cause)
11864                         sctp_m_freem(cause);
11865                 return;
11866         }
11867         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11868             use_mflowid, mflowid,
11869             vrf_id, port);
11870         return;
11871 }
11872
11873 void
11874 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11875     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11876     uint8_t use_mflowid, uint32_t mflowid,
11877     uint32_t vrf_id, uint16_t port)
11878 {
11879         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11880             use_mflowid, mflowid,
11881             vrf_id, port);
11882         return;
11883 }
11884
11885 static struct mbuf *
11886 sctp_copy_resume(struct uio *uio,
11887     int max_send_len,
11888     int user_marks_eor,
11889     int *error,
11890     uint32_t * sndout,
11891     struct mbuf **new_tail)
11892 {
11893         struct mbuf *m;
11894
11895         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11896             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11897         if (m == NULL) {
11898                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11899                 *error = ENOMEM;
11900         } else {
11901                 *sndout = m_length(m, NULL);
11902                 *new_tail = m_last(m);
11903         }
11904         return (m);
11905 }
11906
11907 static int
11908 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11909     struct uio *uio,
11910     int resv_upfront)
11911 {
11912         int left;
11913
11914         left = sp->length;
11915         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11916             resv_upfront, 0);
11917         if (sp->data == NULL) {
11918                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11919                 return (ENOMEM);
11920         }
11921         sp->tail_mbuf = m_last(sp->data);
11922         return (0);
11923 }
11924
11925
11926
11927 static struct sctp_stream_queue_pending *
11928 sctp_copy_it_in(struct sctp_tcb *stcb,
11929     struct sctp_association *asoc,
11930     struct sctp_sndrcvinfo *srcv,
11931     struct uio *uio,
11932     struct sctp_nets *net,
11933     int max_send_len,
11934     int user_marks_eor,
11935     int *error)
11936 {
11937         /*-
11938          * This routine must be very careful in its work. Protocol
11939          * processing is up and running so care must be taken to spl...()
11940          * when you need to do something that may effect the stcb/asoc. The
11941          * sb is locked however. When data is copied the protocol processing
11942          * should be enabled since this is a slower operation...
11943          */
11944         struct sctp_stream_queue_pending *sp = NULL;
11945         int resv_in_first;
11946
11947         *error = 0;
11948         /* Now can we send this? */
11949         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11950             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11951             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11952             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11953                 /* got data while shutting down */
11954                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11955                 *error = ECONNRESET;
11956                 goto out_now;
11957         }
11958         sctp_alloc_a_strmoq(stcb, sp);
11959         if (sp == NULL) {
11960                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11961                 *error = ENOMEM;
11962                 goto out_now;
11963         }
11964         sp->act_flags = 0;
11965         sp->sender_all_done = 0;
11966         sp->sinfo_flags = srcv->sinfo_flags;
11967         sp->timetolive = srcv->sinfo_timetolive;
11968         sp->ppid = srcv->sinfo_ppid;
11969         sp->context = srcv->sinfo_context;
11970         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11971
11972         sp->stream = srcv->sinfo_stream;
11973         sp->length = min(uio->uio_resid, max_send_len);
11974         if ((sp->length == (uint32_t) uio->uio_resid) &&
11975             ((user_marks_eor == 0) ||
11976             (srcv->sinfo_flags & SCTP_EOF) ||
11977             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11978                 sp->msg_is_complete = 1;
11979         } else {
11980                 sp->msg_is_complete = 0;
11981         }
11982         sp->sender_all_done = 0;
11983         sp->some_taken = 0;
11984         sp->put_last_out = 0;
11985         resv_in_first = sizeof(struct sctp_data_chunk);
11986         sp->data = sp->tail_mbuf = NULL;
11987         if (sp->length == 0) {
11988                 *error = 0;
11989                 goto skip_copy;
11990         }
11991         if (srcv->sinfo_keynumber_valid) {
11992                 sp->auth_keyid = srcv->sinfo_keynumber;
11993         } else {
11994                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
11995         }
11996         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
11997                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
11998                 sp->holds_key_ref = 1;
11999         }
12000         *error = sctp_copy_one(sp, uio, resv_in_first);
12001 skip_copy:
12002         if (*error) {
12003                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12004                 sp = NULL;
12005         } else {
12006                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12007                         sp->net = net;
12008                         atomic_add_int(&sp->net->ref_count, 1);
12009                 } else {
12010                         sp->net = NULL;
12011                 }
12012                 sctp_set_prsctp_policy(sp);
12013         }
12014 out_now:
12015         return (sp);
12016 }
12017
12018
12019 int
12020 sctp_sosend(struct socket *so,
12021     struct sockaddr *addr,
12022     struct uio *uio,
12023     struct mbuf *top,
12024     struct mbuf *control,
12025     int flags,
12026     struct thread *p
12027 )
12028 {
12029         int error, use_sndinfo = 0;
12030         struct sctp_sndrcvinfo sndrcvninfo;
12031         struct sockaddr *addr_to_use;
12032
12033 #if defined(INET) && defined(INET6)
12034         struct sockaddr_in sin;
12035
12036 #endif
12037
12038         if (control) {
12039                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12040                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12041                     sizeof(sndrcvninfo))) {
12042                         /* got one */
12043                         use_sndinfo = 1;
12044                 }
12045         }
12046         addr_to_use = addr;
12047 #if defined(INET) && defined(INET6)
12048         if ((addr) && (addr->sa_family == AF_INET6)) {
12049                 struct sockaddr_in6 *sin6;
12050
12051                 sin6 = (struct sockaddr_in6 *)addr;
12052                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12053                         in6_sin6_2_sin(&sin, sin6);
12054                         addr_to_use = (struct sockaddr *)&sin;
12055                 }
12056         }
12057 #endif
12058         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12059             control,
12060             flags,
12061             use_sndinfo ? &sndrcvninfo : NULL
12062             ,p
12063             );
12064         return (error);
12065 }
12066
12067
12068 int
12069 sctp_lower_sosend(struct socket *so,
12070     struct sockaddr *addr,
12071     struct uio *uio,
12072     struct mbuf *i_pak,
12073     struct mbuf *control,
12074     int flags,
12075     struct sctp_sndrcvinfo *srcv
12076     ,
12077     struct thread *p
12078 )
12079 {
12080         unsigned int sndlen = 0, max_len;
12081         int error, len;
12082         struct mbuf *top = NULL;
12083         int queue_only = 0, queue_only_for_init = 0;
12084         int free_cnt_applied = 0;
12085         int un_sent;
12086         int now_filled = 0;
12087         unsigned int inqueue_bytes = 0;
12088         struct sctp_block_entry be;
12089         struct sctp_inpcb *inp;
12090         struct sctp_tcb *stcb = NULL;
12091         struct timeval now;
12092         struct sctp_nets *net;
12093         struct sctp_association *asoc;
12094         struct sctp_inpcb *t_inp;
12095         int user_marks_eor;
12096         int create_lock_applied = 0;
12097         int nagle_applies = 0;
12098         int some_on_control = 0;
12099         int got_all_of_the_send = 0;
12100         int hold_tcblock = 0;
12101         int non_blocking = 0;
12102         uint32_t local_add_more, local_soresv = 0;
12103         uint16_t port;
12104         uint16_t sinfo_flags;
12105         sctp_assoc_t sinfo_assoc_id;
12106
12107         error = 0;
12108         net = NULL;
12109         stcb = NULL;
12110         asoc = NULL;
12111
12112         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12113         if (inp == NULL) {
12114                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12115                 error = EINVAL;
12116                 if (i_pak) {
12117                         SCTP_RELEASE_PKT(i_pak);
12118                 }
12119                 return (error);
12120         }
12121         if ((uio == NULL) && (i_pak == NULL)) {
12122                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12123                 return (EINVAL);
12124         }
12125         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12126         atomic_add_int(&inp->total_sends, 1);
12127         if (uio) {
12128                 if (uio->uio_resid < 0) {
12129                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12130                         return (EINVAL);
12131                 }
12132                 sndlen = uio->uio_resid;
12133         } else {
12134                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12135                 sndlen = SCTP_HEADER_LEN(i_pak);
12136         }
12137         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12138             (void *)addr,
12139             sndlen);
12140         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12141             (inp->sctp_socket->so_qlimit)) {
12142                 /* The listener can NOT send */
12143                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12144                 error = ENOTCONN;
12145                 goto out_unlocked;
12146         }
12147         /**
12148          * Pre-screen address, if one is given the sin-len
12149          * must be set correctly!
12150          */
12151         if (addr) {
12152                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12153
12154                 switch (raddr->sa.sa_family) {
12155 #ifdef INET
12156                 case AF_INET:
12157                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12158                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12159                                 error = EINVAL;
12160                                 goto out_unlocked;
12161                         }
12162                         port = raddr->sin.sin_port;
12163                         break;
12164 #endif
12165 #ifdef INET6
12166                 case AF_INET6:
12167                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12168                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12169                                 error = EINVAL;
12170                                 goto out_unlocked;
12171                         }
12172                         port = raddr->sin6.sin6_port;
12173                         break;
12174 #endif
12175                 default:
12176                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12177                         error = EAFNOSUPPORT;
12178                         goto out_unlocked;
12179                 }
12180         } else
12181                 port = 0;
12182
12183         if (srcv) {
12184                 sinfo_flags = srcv->sinfo_flags;
12185                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12186                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12187                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12188                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12189                         error = EINVAL;
12190                         goto out_unlocked;
12191                 }
12192                 if (srcv->sinfo_flags)
12193                         SCTP_STAT_INCR(sctps_sends_with_flags);
12194         } else {
12195                 sinfo_flags = inp->def_send.sinfo_flags;
12196                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12197         }
12198         if (sinfo_flags & SCTP_SENDALL) {
12199                 /* its a sendall */
12200                 error = sctp_sendall(inp, uio, top, srcv);
12201                 top = NULL;
12202                 goto out_unlocked;
12203         }
12204         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12205                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12206                 error = EINVAL;
12207                 goto out_unlocked;
12208         }
12209         /* now we must find the assoc */
12210         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12211             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12212                 SCTP_INP_RLOCK(inp);
12213                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12214                 if (stcb) {
12215                         SCTP_TCB_LOCK(stcb);
12216                         hold_tcblock = 1;
12217                 }
12218                 SCTP_INP_RUNLOCK(inp);
12219         } else if (sinfo_assoc_id) {
12220                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12221         } else if (addr) {
12222                 /*-
12223                  * Since we did not use findep we must
12224                  * increment it, and if we don't find a tcb
12225                  * decrement it.
12226                  */
12227                 SCTP_INP_WLOCK(inp);
12228                 SCTP_INP_INCR_REF(inp);
12229                 SCTP_INP_WUNLOCK(inp);
12230                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12231                 if (stcb == NULL) {
12232                         SCTP_INP_WLOCK(inp);
12233                         SCTP_INP_DECR_REF(inp);
12234                         SCTP_INP_WUNLOCK(inp);
12235                 } else {
12236                         hold_tcblock = 1;
12237                 }
12238         }
12239         if ((stcb == NULL) && (addr)) {
12240                 /* Possible implicit send? */
12241                 SCTP_ASOC_CREATE_LOCK(inp);
12242                 create_lock_applied = 1;
12243                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12244                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12245                         /* Should I really unlock ? */
12246                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12247                         error = EINVAL;
12248                         goto out_unlocked;
12249
12250                 }
12251                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12252                     (addr->sa_family == AF_INET6)) {
12253                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12254                         error = EINVAL;
12255                         goto out_unlocked;
12256                 }
12257                 SCTP_INP_WLOCK(inp);
12258                 SCTP_INP_INCR_REF(inp);
12259                 SCTP_INP_WUNLOCK(inp);
12260                 /* With the lock applied look again */
12261                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12262                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12263                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12264                 }
12265                 if (stcb == NULL) {
12266                         SCTP_INP_WLOCK(inp);
12267                         SCTP_INP_DECR_REF(inp);
12268                         SCTP_INP_WUNLOCK(inp);
12269                 } else {
12270                         hold_tcblock = 1;
12271                 }
12272                 if (error) {
12273                         goto out_unlocked;
12274                 }
12275                 if (t_inp != inp) {
12276                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12277                         error = ENOTCONN;
12278                         goto out_unlocked;
12279                 }
12280         }
12281         if (stcb == NULL) {
12282                 if (addr == NULL) {
12283                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12284                         error = ENOENT;
12285                         goto out_unlocked;
12286                 } else {
12287                         /* We must go ahead and start the INIT process */
12288                         uint32_t vrf_id;
12289
12290                         if ((sinfo_flags & SCTP_ABORT) ||
12291                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12292                                 /*-
12293                                  * User asks to abort a non-existant assoc,
12294                                  * or EOF a non-existant assoc with no data
12295                                  */
12296                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12297                                 error = ENOENT;
12298                                 goto out_unlocked;
12299                         }
12300                         /* get an asoc/stcb struct */
12301                         vrf_id = inp->def_vrf_id;
12302 #ifdef INVARIANTS
12303                         if (create_lock_applied == 0) {
12304                                 panic("Error, should hold create lock and I don't?");
12305                         }
12306 #endif
12307                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12308                             p
12309                             );
12310                         if (stcb == NULL) {
12311                                 /* Error is setup for us in the call */
12312                                 goto out_unlocked;
12313                         }
12314                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12315                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12316                                 /*
12317                                  * Set the connected flag so we can queue
12318                                  * data
12319                                  */
12320                                 soisconnecting(so);
12321                         }
12322                         hold_tcblock = 1;
12323                         if (create_lock_applied) {
12324                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12325                                 create_lock_applied = 0;
12326                         } else {
12327                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12328                         }
12329                         /*
12330                          * Turn on queue only flag to prevent data from
12331                          * being sent
12332                          */
12333                         queue_only = 1;
12334                         asoc = &stcb->asoc;
12335                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12336                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12337
12338                         /* initialize authentication params for the assoc */
12339                         sctp_initialize_auth_params(inp, stcb);
12340
12341                         if (control) {
12342                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12343                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12344                                         hold_tcblock = 0;
12345                                         stcb = NULL;
12346                                         goto out_unlocked;
12347                                 }
12348                         }
12349                         /* out with the INIT */
12350                         queue_only_for_init = 1;
12351                         /*-
12352                          * we may want to dig in after this call and adjust the MTU
12353                          * value. It defaulted to 1500 (constant) but the ro
12354                          * structure may now have an update and thus we may need to
12355                          * change it BEFORE we append the message.
12356                          */
12357                 }
12358         } else
12359                 asoc = &stcb->asoc;
12360         if (srcv == NULL)
12361                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12362         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12363                 if (addr)
12364                         net = sctp_findnet(stcb, addr);
12365                 else
12366                         net = NULL;
12367                 if ((net == NULL) ||
12368                     ((port != 0) && (port != stcb->rport))) {
12369                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12370                         error = EINVAL;
12371                         goto out_unlocked;
12372                 }
12373         } else {
12374                 if (stcb->asoc.alternate) {
12375                         net = stcb->asoc.alternate;
12376                 } else {
12377                         net = stcb->asoc.primary_destination;
12378                 }
12379         }
12380         atomic_add_int(&stcb->total_sends, 1);
12381         /* Keep the stcb from being freed under our feet */
12382         atomic_add_int(&asoc->refcnt, 1);
12383         free_cnt_applied = 1;
12384
12385         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12386                 if (sndlen > asoc->smallest_mtu) {
12387                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12388                         error = EMSGSIZE;
12389                         goto out_unlocked;
12390                 }
12391         }
12392         if (SCTP_SO_IS_NBIO(so)
12393             || (flags & MSG_NBIO)
12394             ) {
12395                 non_blocking = 1;
12396         }
12397         /* would we block? */
12398         if (non_blocking) {
12399                 if (hold_tcblock == 0) {
12400                         SCTP_TCB_LOCK(stcb);
12401                         hold_tcblock = 1;
12402                 }
12403                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12404                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12405                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12406                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12407                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12408                                 error = EMSGSIZE;
12409                         else
12410                                 error = EWOULDBLOCK;
12411                         goto out_unlocked;
12412                 }
12413                 stcb->asoc.sb_send_resv += sndlen;
12414                 SCTP_TCB_UNLOCK(stcb);
12415                 hold_tcblock = 0;
12416         } else {
12417                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12418         }
12419         local_soresv = sndlen;
12420         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12421                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12422                 error = ECONNRESET;
12423                 goto out_unlocked;
12424         }
12425         if (create_lock_applied) {
12426                 SCTP_ASOC_CREATE_UNLOCK(inp);
12427                 create_lock_applied = 0;
12428         }
12429         if (asoc->stream_reset_outstanding) {
12430                 /*
12431                  * Can't queue any data while stream reset is underway.
12432                  */
12433                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12434                 error = EAGAIN;
12435                 goto out_unlocked;
12436         }
12437         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12438             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12439                 queue_only = 1;
12440         }
12441         /* we are now done with all control */
12442         if (control) {
12443                 sctp_m_freem(control);
12444                 control = NULL;
12445         }
12446         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12447             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12448             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12449             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12450                 if (srcv->sinfo_flags & SCTP_ABORT) {
12451                         ;
12452                 } else {
12453                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12454                         error = ECONNRESET;
12455                         goto out_unlocked;
12456                 }
12457         }
12458         /* Ok, we will attempt a msgsnd :> */
12459         if (p) {
12460                 p->td_ru.ru_msgsnd++;
12461         }
12462         /* Are we aborting? */
12463         if (srcv->sinfo_flags & SCTP_ABORT) {
12464                 struct mbuf *mm;
12465                 int tot_demand, tot_out = 0, max_out;
12466
12467                 SCTP_STAT_INCR(sctps_sends_with_abort);
12468                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12469                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12470                         /* It has to be up before we abort */
12471                         /* how big is the user initiated abort? */
12472                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12473                         error = EINVAL;
12474                         goto out;
12475                 }
12476                 if (hold_tcblock) {
12477                         SCTP_TCB_UNLOCK(stcb);
12478                         hold_tcblock = 0;
12479                 }
12480                 if (top) {
12481                         struct mbuf *cntm = NULL;
12482
12483                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12484                         if (sndlen != 0) {
12485                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12486                                         tot_out += SCTP_BUF_LEN(cntm);
12487                                 }
12488                         }
12489                 } else {
12490                         /* Must fit in a MTU */
12491                         tot_out = sndlen;
12492                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12493                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12494                                 /* To big */
12495                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12496                                 error = EMSGSIZE;
12497                                 goto out;
12498                         }
12499                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12500                 }
12501                 if (mm == NULL) {
12502                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12503                         error = ENOMEM;
12504                         goto out;
12505                 }
12506                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12507                 max_out -= sizeof(struct sctp_abort_msg);
12508                 if (tot_out > max_out) {
12509                         tot_out = max_out;
12510                 }
12511                 if (mm) {
12512                         struct sctp_paramhdr *ph;
12513
12514                         /* now move forward the data pointer */
12515                         ph = mtod(mm, struct sctp_paramhdr *);
12516                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12517                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12518                         ph++;
12519                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12520                         if (top == NULL) {
12521                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12522                                 if (error) {
12523                                         /*-
12524                                          * Here if we can't get his data we
12525                                          * still abort we just don't get to
12526                                          * send the users note :-0
12527                                          */
12528                                         sctp_m_freem(mm);
12529                                         mm = NULL;
12530                                 }
12531                         } else {
12532                                 if (sndlen != 0) {
12533                                         SCTP_BUF_NEXT(mm) = top;
12534                                 }
12535                         }
12536                 }
12537                 if (hold_tcblock == 0) {
12538                         SCTP_TCB_LOCK(stcb);
12539                 }
12540                 atomic_add_int(&stcb->asoc.refcnt, -1);
12541                 free_cnt_applied = 0;
12542                 /* release this lock, otherwise we hang on ourselves */
12543                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12544                 /* now relock the stcb so everything is sane */
12545                 hold_tcblock = 0;
12546                 stcb = NULL;
12547                 /*
12548                  * In this case top is already chained to mm avoid double
12549                  * free, since we free it below if top != NULL and driver
12550                  * would free it after sending the packet out
12551                  */
12552                 if (sndlen != 0) {
12553                         top = NULL;
12554                 }
12555                 goto out_unlocked;
12556         }
12557         /* Calculate the maximum we can send */
12558         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12559         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12560                 if (non_blocking) {
12561                         /* we already checked for non-blocking above. */
12562                         max_len = sndlen;
12563                 } else {
12564                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12565                 }
12566         } else {
12567                 max_len = 0;
12568         }
12569         if (hold_tcblock) {
12570                 SCTP_TCB_UNLOCK(stcb);
12571                 hold_tcblock = 0;
12572         }
12573         /* Is the stream no. valid? */
12574         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12575                 /* Invalid stream number */
12576                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12577                 error = EINVAL;
12578                 goto out_unlocked;
12579         }
12580         if (asoc->strmout == NULL) {
12581                 /* huh? software error */
12582                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12583                 error = EFAULT;
12584                 goto out_unlocked;
12585         }
12586         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12587         if ((user_marks_eor == 0) &&
12588             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12589                 /* It will NEVER fit */
12590                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12591                 error = EMSGSIZE;
12592                 goto out_unlocked;
12593         }
12594         if ((uio == NULL) && user_marks_eor) {
12595                 /*-
12596                  * We do not support eeor mode for
12597                  * sending with mbuf chains (like sendfile).
12598                  */
12599                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12600                 error = EINVAL;
12601                 goto out_unlocked;
12602         }
12603         if (user_marks_eor) {
12604                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12605         } else {
12606                 /*-
12607                  * For non-eeor the whole message must fit in
12608                  * the socket send buffer.
12609                  */
12610                 local_add_more = sndlen;
12611         }
12612         len = 0;
12613         if (non_blocking) {
12614                 goto skip_preblock;
12615         }
12616         if (((max_len <= local_add_more) &&
12617             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12618             (max_len == 0) ||
12619             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12620                 /* No room right now ! */
12621                 SOCKBUF_LOCK(&so->so_snd);
12622                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12623                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12624                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12625                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12626                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12627                             inqueue_bytes,
12628                             local_add_more,
12629                             stcb->asoc.stream_queue_cnt,
12630                             stcb->asoc.chunks_on_out_queue,
12631                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12632                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12633                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12634                         }
12635                         be.error = 0;
12636                         stcb->block_entry = &be;
12637                         error = sbwait(&so->so_snd);
12638                         stcb->block_entry = NULL;
12639                         if (error || so->so_error || be.error) {
12640                                 if (error == 0) {
12641                                         if (so->so_error)
12642                                                 error = so->so_error;
12643                                         if (be.error) {
12644                                                 error = be.error;
12645                                         }
12646                                 }
12647                                 SOCKBUF_UNLOCK(&so->so_snd);
12648                                 goto out_unlocked;
12649                         }
12650                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12651                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12652                                     asoc, stcb->asoc.total_output_queue_size);
12653                         }
12654                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12655                                 goto out_unlocked;
12656                         }
12657                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12658                 }
12659                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12660                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12661                 } else {
12662                         max_len = 0;
12663                 }
12664                 SOCKBUF_UNLOCK(&so->so_snd);
12665         }
12666 skip_preblock:
12667         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12668                 goto out_unlocked;
12669         }
12670         /*
12671          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12672          * case NOTE: uio will be null when top/mbuf is passed
12673          */
12674         if (sndlen == 0) {
12675                 if (srcv->sinfo_flags & SCTP_EOF) {
12676                         got_all_of_the_send = 1;
12677                         goto dataless_eof;
12678                 } else {
12679                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12680                         error = EINVAL;
12681                         goto out;
12682                 }
12683         }
12684         if (top == NULL) {
12685                 struct sctp_stream_queue_pending *sp;
12686                 struct sctp_stream_out *strm;
12687                 uint32_t sndout;
12688
12689                 SCTP_TCB_SEND_LOCK(stcb);
12690                 if ((asoc->stream_locked) &&
12691                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12692                         SCTP_TCB_SEND_UNLOCK(stcb);
12693                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12694                         error = EINVAL;
12695                         goto out;
12696                 }
12697                 SCTP_TCB_SEND_UNLOCK(stcb);
12698
12699                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12700                 if (strm->last_msg_incomplete == 0) {
12701         do_a_copy_in:
12702                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12703                         if ((sp == NULL) || (error)) {
12704                                 goto out;
12705                         }
12706                         SCTP_TCB_SEND_LOCK(stcb);
12707                         if (sp->msg_is_complete) {
12708                                 strm->last_msg_incomplete = 0;
12709                                 asoc->stream_locked = 0;
12710                         } else {
12711                                 /*
12712                                  * Just got locked to this guy in case of an
12713                                  * interrupt.
12714                                  */
12715                                 strm->last_msg_incomplete = 1;
12716                                 asoc->stream_locked = 1;
12717                                 asoc->stream_locked_on = srcv->sinfo_stream;
12718                                 sp->sender_all_done = 0;
12719                         }
12720                         sctp_snd_sb_alloc(stcb, sp->length);
12721                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12722                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
12723                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12724                         }
12725                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12726                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12727                         SCTP_TCB_SEND_UNLOCK(stcb);
12728                 } else {
12729                         SCTP_TCB_SEND_LOCK(stcb);
12730                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12731                         SCTP_TCB_SEND_UNLOCK(stcb);
12732                         if (sp == NULL) {
12733                                 /* ???? Huh ??? last msg is gone */
12734 #ifdef INVARIANTS
12735                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12736 #else
12737                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12738                                 strm->last_msg_incomplete = 0;
12739 #endif
12740                                 goto do_a_copy_in;
12741
12742                         }
12743                 }
12744                 while (uio->uio_resid > 0) {
12745                         /* How much room do we have? */
12746                         struct mbuf *new_tail, *mm;
12747
12748                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12749                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12750                         else
12751                                 max_len = 0;
12752
12753                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12754                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12755                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12756                                 sndout = 0;
12757                                 new_tail = NULL;
12758                                 if (hold_tcblock) {
12759                                         SCTP_TCB_UNLOCK(stcb);
12760                                         hold_tcblock = 0;
12761                                 }
12762                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12763                                 if ((mm == NULL) || error) {
12764                                         if (mm) {
12765                                                 sctp_m_freem(mm);
12766                                         }
12767                                         goto out;
12768                                 }
12769                                 /* Update the mbuf and count */
12770                                 SCTP_TCB_SEND_LOCK(stcb);
12771                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12772                                         /*
12773                                          * we need to get out. Peer probably
12774                                          * aborted.
12775                                          */
12776                                         sctp_m_freem(mm);
12777                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12778                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12779                                                 error = ECONNRESET;
12780                                         }
12781                                         SCTP_TCB_SEND_UNLOCK(stcb);
12782                                         goto out;
12783                                 }
12784                                 if (sp->tail_mbuf) {
12785                                         /* tack it to the end */
12786                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12787                                         sp->tail_mbuf = new_tail;
12788                                 } else {
12789                                         /* A stolen mbuf */
12790                                         sp->data = mm;
12791                                         sp->tail_mbuf = new_tail;
12792                                 }
12793                                 sctp_snd_sb_alloc(stcb, sndout);
12794                                 atomic_add_int(&sp->length, sndout);
12795                                 len += sndout;
12796
12797                                 /* Did we reach EOR? */
12798                                 if ((uio->uio_resid == 0) &&
12799                                     ((user_marks_eor == 0) ||
12800                                     (srcv->sinfo_flags & SCTP_EOF) ||
12801                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12802                                         sp->msg_is_complete = 1;
12803                                 } else {
12804                                         sp->msg_is_complete = 0;
12805                                 }
12806                                 SCTP_TCB_SEND_UNLOCK(stcb);
12807                         }
12808                         if (uio->uio_resid == 0) {
12809                                 /* got it all? */
12810                                 continue;
12811                         }
12812                         /* PR-SCTP? */
12813                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12814                                 /*
12815                                  * This is ugly but we must assure locking
12816                                  * order
12817                                  */
12818                                 if (hold_tcblock == 0) {
12819                                         SCTP_TCB_LOCK(stcb);
12820                                         hold_tcblock = 1;
12821                                 }
12822                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12823                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12824                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12825                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12826                                 else
12827                                         max_len = 0;
12828                                 if (max_len > 0) {
12829                                         continue;
12830                                 }
12831                                 SCTP_TCB_UNLOCK(stcb);
12832                                 hold_tcblock = 0;
12833                         }
12834                         /* wait for space now */
12835                         if (non_blocking) {
12836                                 /* Non-blocking io in place out */
12837                                 goto skip_out_eof;
12838                         }
12839                         /* What about the INIT, send it maybe */
12840                         if (queue_only_for_init) {
12841                                 if (hold_tcblock == 0) {
12842                                         SCTP_TCB_LOCK(stcb);
12843                                         hold_tcblock = 1;
12844                                 }
12845                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12846                                         /* a collision took us forward? */
12847                                         queue_only = 0;
12848                                 } else {
12849                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12850                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12851                                         queue_only = 1;
12852                                 }
12853                         }
12854                         if ((net->flight_size > net->cwnd) &&
12855                             (asoc->sctp_cmt_on_off == 0)) {
12856                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12857                                 queue_only = 1;
12858                         } else if (asoc->ifp_had_enobuf) {
12859                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12860                                 if (net->flight_size > (2 * net->mtu)) {
12861                                         queue_only = 1;
12862                                 }
12863                                 asoc->ifp_had_enobuf = 0;
12864                         }
12865                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12866                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12867                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12868                             (stcb->asoc.total_flight > 0) &&
12869                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12870                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12871
12872                                 /*-
12873                                  * Ok, Nagle is set on and we have data outstanding.
12874                                  * Don't send anything and let SACKs drive out the
12875                                  * data unless wen have a "full" segment to send.
12876                                  */
12877                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12878                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12879                                 }
12880                                 SCTP_STAT_INCR(sctps_naglequeued);
12881                                 nagle_applies = 1;
12882                         } else {
12883                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12884                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12885                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12886                                 }
12887                                 SCTP_STAT_INCR(sctps_naglesent);
12888                                 nagle_applies = 0;
12889                         }
12890                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12891
12892                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12893                                     nagle_applies, un_sent);
12894                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12895                                     stcb->asoc.total_flight,
12896                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12897                         }
12898                         if (queue_only_for_init)
12899                                 queue_only_for_init = 0;
12900                         if ((queue_only == 0) && (nagle_applies == 0)) {
12901                                 /*-
12902                                  * need to start chunk output
12903                                  * before blocking.. note that if
12904                                  * a lock is already applied, then
12905                                  * the input via the net is happening
12906                                  * and I don't need to start output :-D
12907                                  */
12908                                 if (hold_tcblock == 0) {
12909                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12910                                                 hold_tcblock = 1;
12911                                                 sctp_chunk_output(inp,
12912                                                     stcb,
12913                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12914                                         }
12915                                 } else {
12916                                         sctp_chunk_output(inp,
12917                                             stcb,
12918                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12919                                 }
12920                                 if (hold_tcblock == 1) {
12921                                         SCTP_TCB_UNLOCK(stcb);
12922                                         hold_tcblock = 0;
12923                                 }
12924                         }
12925                         SOCKBUF_LOCK(&so->so_snd);
12926                         /*-
12927                          * This is a bit strange, but I think it will
12928                          * work. The total_output_queue_size is locked and
12929                          * protected by the TCB_LOCK, which we just released.
12930                          * There is a race that can occur between releasing it
12931                          * above, and me getting the socket lock, where sacks
12932                          * come in but we have not put the SB_WAIT on the
12933                          * so_snd buffer to get the wakeup. After the LOCK
12934                          * is applied the sack_processing will also need to
12935                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12936                          * once we have the socket buffer lock if we recheck the
12937                          * size we KNOW we will get to sleep safely with the
12938                          * wakeup flag in place.
12939                          */
12940                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12941                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
12942                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12943                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12944                                             asoc, uio->uio_resid);
12945                                 }
12946                                 be.error = 0;
12947                                 stcb->block_entry = &be;
12948                                 error = sbwait(&so->so_snd);
12949                                 stcb->block_entry = NULL;
12950
12951                                 if (error || so->so_error || be.error) {
12952                                         if (error == 0) {
12953                                                 if (so->so_error)
12954                                                         error = so->so_error;
12955                                                 if (be.error) {
12956                                                         error = be.error;
12957                                                 }
12958                                         }
12959                                         SOCKBUF_UNLOCK(&so->so_snd);
12960                                         goto out_unlocked;
12961                                 }
12962                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12963                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12964                                             asoc, stcb->asoc.total_output_queue_size);
12965                                 }
12966                         }
12967                         SOCKBUF_UNLOCK(&so->so_snd);
12968                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12969                                 goto out_unlocked;
12970                         }
12971                 }
12972                 SCTP_TCB_SEND_LOCK(stcb);
12973                 if (sp) {
12974                         if (sp->msg_is_complete == 0) {
12975                                 strm->last_msg_incomplete = 1;
12976                                 asoc->stream_locked = 1;
12977                                 asoc->stream_locked_on = srcv->sinfo_stream;
12978                         } else {
12979                                 sp->sender_all_done = 1;
12980                                 strm->last_msg_incomplete = 0;
12981                                 asoc->stream_locked = 0;
12982                         }
12983                 } else {
12984                         SCTP_PRINTF("Huh no sp TSNH?\n");
12985                         strm->last_msg_incomplete = 0;
12986                         asoc->stream_locked = 0;
12987                 }
12988                 SCTP_TCB_SEND_UNLOCK(stcb);
12989                 if (uio->uio_resid == 0) {
12990                         got_all_of_the_send = 1;
12991                 }
12992         } else {
12993                 /* We send in a 0, since we do NOT have any locks */
12994                 error = sctp_msg_append(stcb, net, top, srcv, 0);
12995                 top = NULL;
12996                 if (srcv->sinfo_flags & SCTP_EOF) {
12997                         /*
12998                          * This should only happen for Panda for the mbuf
12999                          * send case, which does NOT yet support EEOR mode.
13000                          * Thus, we can just set this flag to do the proper
13001                          * EOF handling.
13002                          */
13003                         got_all_of_the_send = 1;
13004                 }
13005         }
13006         if (error) {
13007                 goto out;
13008         }
13009 dataless_eof:
13010         /* EOF thing ? */
13011         if ((srcv->sinfo_flags & SCTP_EOF) &&
13012             (got_all_of_the_send == 1)) {
13013                 int cnt;
13014
13015                 SCTP_STAT_INCR(sctps_sends_with_eof);
13016                 error = 0;
13017                 if (hold_tcblock == 0) {
13018                         SCTP_TCB_LOCK(stcb);
13019                         hold_tcblock = 1;
13020                 }
13021                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13022                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13023                     TAILQ_EMPTY(&asoc->sent_queue) &&
13024                     (cnt == 0)) {
13025                         if (asoc->locked_on_sending) {
13026                                 goto abort_anyway;
13027                         }
13028                         /* there is nothing queued to send, so I'm done... */
13029                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13030                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13031                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13032                                 struct sctp_nets *netp;
13033
13034                                 /* only send SHUTDOWN the first time through */
13035                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13036                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13037                                 }
13038                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13039                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13040                                 sctp_stop_timers_for_shutdown(stcb);
13041                                 if (stcb->asoc.alternate) {
13042                                         netp = stcb->asoc.alternate;
13043                                 } else {
13044                                         netp = stcb->asoc.primary_destination;
13045                                 }
13046                                 sctp_send_shutdown(stcb, netp);
13047                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13048                                     netp);
13049                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13050                                     asoc->primary_destination);
13051                         }
13052                 } else {
13053                         /*-
13054                          * we still got (or just got) data to send, so set
13055                          * SHUTDOWN_PENDING
13056                          */
13057                         /*-
13058                          * XXX sockets draft says that SCTP_EOF should be
13059                          * sent with no data.  currently, we will allow user
13060                          * data to be sent first and move to
13061                          * SHUTDOWN-PENDING
13062                          */
13063                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13064                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13065                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13066                                 if (hold_tcblock == 0) {
13067                                         SCTP_TCB_LOCK(stcb);
13068                                         hold_tcblock = 1;
13069                                 }
13070                                 if (asoc->locked_on_sending) {
13071                                         /* Locked to send out the data */
13072                                         struct sctp_stream_queue_pending *sp;
13073
13074                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13075                                         if (sp) {
13076                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13077                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13078                                         }
13079                                 }
13080                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13081                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13082                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13083                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13084                         abort_anyway:
13085                                         if (free_cnt_applied) {
13086                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13087                                                 free_cnt_applied = 0;
13088                                         }
13089                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13090                                             NULL, SCTP_SO_LOCKED);
13091                                         /*
13092                                          * now relock the stcb so everything
13093                                          * is sane
13094                                          */
13095                                         hold_tcblock = 0;
13096                                         stcb = NULL;
13097                                         goto out;
13098                                 }
13099                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13100                                     asoc->primary_destination);
13101                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13102                         }
13103                 }
13104         }
13105 skip_out_eof:
13106         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13107                 some_on_control = 1;
13108         }
13109         if (queue_only_for_init) {
13110                 if (hold_tcblock == 0) {
13111                         SCTP_TCB_LOCK(stcb);
13112                         hold_tcblock = 1;
13113                 }
13114                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13115                         /* a collision took us forward? */
13116                         queue_only = 0;
13117                 } else {
13118                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13119                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13120                         queue_only = 1;
13121                 }
13122         }
13123         if ((net->flight_size > net->cwnd) &&
13124             (stcb->asoc.sctp_cmt_on_off == 0)) {
13125                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13126                 queue_only = 1;
13127         } else if (asoc->ifp_had_enobuf) {
13128                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13129                 if (net->flight_size > (2 * net->mtu)) {
13130                         queue_only = 1;
13131                 }
13132                 asoc->ifp_had_enobuf = 0;
13133         }
13134         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13135             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13136         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13137             (stcb->asoc.total_flight > 0) &&
13138             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13139             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13140                 /*-
13141                  * Ok, Nagle is set on and we have data outstanding.
13142                  * Don't send anything and let SACKs drive out the
13143                  * data unless wen have a "full" segment to send.
13144                  */
13145                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13146                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13147                 }
13148                 SCTP_STAT_INCR(sctps_naglequeued);
13149                 nagle_applies = 1;
13150         } else {
13151                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13152                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13153                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13154                 }
13155                 SCTP_STAT_INCR(sctps_naglesent);
13156                 nagle_applies = 0;
13157         }
13158         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13159                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13160                     nagle_applies, un_sent);
13161                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13162                     stcb->asoc.total_flight,
13163                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13164         }
13165         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13166                 /* we can attempt to send too. */
13167                 if (hold_tcblock == 0) {
13168                         /*
13169                          * If there is activity recv'ing sacks no need to
13170                          * send
13171                          */
13172                         if (SCTP_TCB_TRYLOCK(stcb)) {
13173                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13174                                 hold_tcblock = 1;
13175                         }
13176                 } else {
13177                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13178                 }
13179         } else if ((queue_only == 0) &&
13180                     (stcb->asoc.peers_rwnd == 0) &&
13181             (stcb->asoc.total_flight == 0)) {
13182                 /* We get to have a probe outstanding */
13183                 if (hold_tcblock == 0) {
13184                         hold_tcblock = 1;
13185                         SCTP_TCB_LOCK(stcb);
13186                 }
13187                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13188         } else if (some_on_control) {
13189                 int num_out, reason, frag_point;
13190
13191                 /* Here we do control only */
13192                 if (hold_tcblock == 0) {
13193                         hold_tcblock = 1;
13194                         SCTP_TCB_LOCK(stcb);
13195                 }
13196                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13197                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13198                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13199         }
13200         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13201             queue_only, stcb->asoc.peers_rwnd, un_sent,
13202             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13203             stcb->asoc.total_output_queue_size, error);
13204
13205 out:
13206 out_unlocked:
13207
13208         if (local_soresv && stcb) {
13209                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13210         }
13211         if (create_lock_applied) {
13212                 SCTP_ASOC_CREATE_UNLOCK(inp);
13213         }
13214         if ((stcb) && hold_tcblock) {
13215                 SCTP_TCB_UNLOCK(stcb);
13216         }
13217         if (stcb && free_cnt_applied) {
13218                 atomic_add_int(&stcb->asoc.refcnt, -1);
13219         }
13220 #ifdef INVARIANTS
13221         if (stcb) {
13222                 if (mtx_owned(&stcb->tcb_mtx)) {
13223                         panic("Leaving with tcb mtx owned?");
13224                 }
13225                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13226                         panic("Leaving with tcb send mtx owned?");
13227                 }
13228         }
13229 #endif
13230 #ifdef INVARIANTS
13231         if (inp) {
13232                 sctp_validate_no_locks(inp);
13233         } else {
13234                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13235         }
13236 #endif
13237         if (top) {
13238                 sctp_m_freem(top);
13239         }
13240         if (control) {
13241                 sctp_m_freem(control);
13242         }
13243         return (error);
13244 }
13245
13246
13247 /*
13248  * generate an AUTHentication chunk, if required
13249  */
13250 struct mbuf *
13251 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13252     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13253     struct sctp_tcb *stcb, uint8_t chunk)
13254 {
13255         struct mbuf *m_auth;
13256         struct sctp_auth_chunk *auth;
13257         int chunk_len;
13258         struct mbuf *cn;
13259
13260         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13261             (stcb == NULL))
13262                 return (m);
13263
13264         /* sysctl disabled auth? */
13265         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13266                 return (m);
13267
13268         /* peer doesn't do auth... */
13269         if (!stcb->asoc.peer_supports_auth) {
13270                 return (m);
13271         }
13272         /* does the requested chunk require auth? */
13273         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13274                 return (m);
13275         }
13276         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13277         if (m_auth == NULL) {
13278                 /* no mbuf's */
13279                 return (m);
13280         }
13281         /* reserve some space if this will be the first mbuf */
13282         if (m == NULL)
13283                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13284         /* fill in the AUTH chunk details */
13285         auth = mtod(m_auth, struct sctp_auth_chunk *);
13286         bzero(auth, sizeof(*auth));
13287         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13288         auth->ch.chunk_flags = 0;
13289         chunk_len = sizeof(*auth) +
13290             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13291         auth->ch.chunk_length = htons(chunk_len);
13292         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13293         /* key id and hmac digest will be computed and filled in upon send */
13294
13295         /* save the offset where the auth was inserted into the chain */
13296         *offset = 0;
13297         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13298                 *offset += SCTP_BUF_LEN(cn);
13299         }
13300
13301         /* update length and return pointer to the auth chunk */
13302         SCTP_BUF_LEN(m_auth) = chunk_len;
13303         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13304         if (auth_ret != NULL)
13305                 *auth_ret = auth;
13306
13307         return (m);
13308 }
13309
13310 #ifdef INET6
13311 int
13312 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13313 {
13314         struct nd_prefix *pfx = NULL;
13315         struct nd_pfxrouter *pfxrtr = NULL;
13316         struct sockaddr_in6 gw6;
13317
13318         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13319                 return (0);
13320
13321         /* get prefix entry of address */
13322         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13323                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13324                         continue;
13325                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13326                     &src6->sin6_addr, &pfx->ndpr_mask))
13327                         break;
13328         }
13329         /* no prefix entry in the prefix list */
13330         if (pfx == NULL) {
13331                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13332                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13333                 return (0);
13334         }
13335         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13336         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13337
13338         /* search installed gateway from prefix entry */
13339         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13340                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13341                 gw6.sin6_family = AF_INET6;
13342                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13343                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13344                     sizeof(struct in6_addr));
13345                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13346                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13347                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13348                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13349                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13350                     ro->ro_rt->rt_gateway)) {
13351                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13352                         return (1);
13353                 }
13354         }
13355         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13356         return (0);
13357 }
13358
13359 #endif
13360
13361 int
13362 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13363 {
13364 #ifdef INET
13365         struct sockaddr_in *sin, *mask;
13366         struct ifaddr *ifa;
13367         struct in_addr srcnetaddr, gwnetaddr;
13368
13369         if (ro == NULL || ro->ro_rt == NULL ||
13370             sifa->address.sa.sa_family != AF_INET) {
13371                 return (0);
13372         }
13373         ifa = (struct ifaddr *)sifa->ifa;
13374         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13375         sin = (struct sockaddr_in *)&sifa->address.sin;
13376         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13377         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13378         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13379         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13380
13381         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13382         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13383         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13384         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13385         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13386         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13387                 return (1);
13388         }
13389 #endif
13390         return (0);
13391 }