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