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     int ipv4_addr_legal,
1867     int ipv6_addr_legal,
1868     int loopback_scope,
1869     int ipv4_local_scope,
1870     int local_scope SCTP_UNUSED,/* XXX */
1871     int site_scope,
1872     int do_update)
1873 {
1874         if ((loopback_scope == 0) &&
1875             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876                 /*
1877                  * skip loopback if not in scope *
1878                  */
1879                 return (0);
1880         }
1881         switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883         case AF_INET:
1884                 if (ipv4_addr_legal) {
1885                         struct sockaddr_in *sin;
1886
1887                         sin = (struct sockaddr_in *)&ifa->address.sin;
1888                         if (sin->sin_addr.s_addr == 0) {
1889                                 /* not in scope , unspecified */
1890                                 return (0);
1891                         }
1892                         if ((ipv4_local_scope == 0) &&
1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894                                 /* private address not in scope */
1895                                 return (0);
1896                         }
1897                 } else {
1898                         return (0);
1899                 }
1900                 break;
1901 #endif
1902 #ifdef INET6
1903         case AF_INET6:
1904                 if (ipv6_addr_legal) {
1905                         struct sockaddr_in6 *sin6;
1906
1907                         /*
1908                          * Must update the flags,  bummer, which means any
1909                          * IFA locks must now be applied HERE <->
1910                          */
1911                         if (do_update) {
1912                                 sctp_gather_internal_ifa_flags(ifa);
1913                         }
1914                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915                                 return (0);
1916                         }
1917                         /* ok to use deprecated addresses? */
1918                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1919                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920                                 /* skip unspecifed addresses */
1921                                 return (0);
1922                         }
1923                         if (    /* (local_scope == 0) && */
1924                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925                                 return (0);
1926                         }
1927                         if ((site_scope == 0) &&
1928                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929                                 return (0);
1930                         }
1931                 } else {
1932                         return (0);
1933                 }
1934                 break;
1935 #endif
1936         default:
1937                 return (0);
1938         }
1939         return (1);
1940 }
1941
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1944 {
1945         struct sctp_paramhdr *parmh;
1946         struct mbuf *mret;
1947         int len;
1948
1949         switch (ifa->address.sa.sa_family) {
1950 #ifdef INET
1951         case AF_INET:
1952                 len = sizeof(struct sctp_ipv4addr_param);
1953                 break;
1954 #endif
1955 #ifdef INET6
1956         case AF_INET6:
1957                 len = sizeof(struct sctp_ipv6addr_param);
1958                 break;
1959 #endif
1960         default:
1961                 return (m);
1962         }
1963         if (M_TRAILINGSPACE(m) >= len) {
1964                 /* easy side we just drop it on the end */
1965                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 parmh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = (struct sockaddr_in *)&ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1991                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         parmh->param_length = htons(len);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += len;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2006                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         parmh->param_length = htons(len);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += len;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         return (mret);
2020 }
2021
2022
2023 struct mbuf *
2024 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2025     struct sctp_scoping *scope,
2026     struct mbuf *m_at, int cnt_inits_to)
2027 {
2028         struct sctp_vrf *vrf = NULL;
2029         int cnt, limit_out = 0, total_count;
2030         uint32_t vrf_id;
2031
2032         vrf_id = inp->def_vrf_id;
2033         SCTP_IPI_ADDR_RLOCK();
2034         vrf = sctp_find_vrf(vrf_id);
2035         if (vrf == NULL) {
2036                 SCTP_IPI_ADDR_RUNLOCK();
2037                 return (m_at);
2038         }
2039         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2040                 struct sctp_ifa *sctp_ifap;
2041                 struct sctp_ifn *sctp_ifnp;
2042
2043                 cnt = cnt_inits_to;
2044                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2045                         limit_out = 1;
2046                         cnt = SCTP_ADDRESS_LIMIT;
2047                         goto skip_count;
2048                 }
2049                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2050                         if ((scope->loopback_scope == 0) &&
2051                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2052                                 /*
2053                                  * Skip loopback devices if loopback_scope
2054                                  * not set
2055                                  */
2056                                 continue;
2057                         }
2058                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2059                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2060                                         continue;
2061                                 }
2062                                 if (sctp_is_address_in_scope(sctp_ifap,
2063                                     scope->ipv4_addr_legal,
2064                                     scope->ipv6_addr_legal,
2065                                     scope->loopback_scope,
2066                                     scope->ipv4_local_scope,
2067                                     scope->local_scope,
2068                                     scope->site_scope, 1) == 0) {
2069                                         continue;
2070                                 }
2071                                 cnt++;
2072                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2073                                         break;
2074                                 }
2075                         }
2076                         if (cnt > SCTP_ADDRESS_LIMIT) {
2077                                 break;
2078                         }
2079                 }
2080 skip_count:
2081                 if (cnt > 1) {
2082                         total_count = 0;
2083                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2084                                 cnt = 0;
2085                                 if ((scope->loopback_scope == 0) &&
2086                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2087                                         /*
2088                                          * Skip loopback devices if
2089                                          * loopback_scope not set
2090                                          */
2091                                         continue;
2092                                 }
2093                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2094                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2095                                                 continue;
2096                                         }
2097                                         if (sctp_is_address_in_scope(sctp_ifap,
2098                                             scope->ipv4_addr_legal,
2099                                             scope->ipv6_addr_legal,
2100                                             scope->loopback_scope,
2101                                             scope->ipv4_local_scope,
2102                                             scope->local_scope,
2103                                             scope->site_scope, 0) == 0) {
2104                                                 continue;
2105                                         }
2106                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2107                                         if (limit_out) {
2108                                                 cnt++;
2109                                                 total_count++;
2110                                                 if (cnt >= 2) {
2111                                                         /*
2112                                                          * two from each
2113                                                          * address
2114                                                          */
2115                                                         break;
2116                                                 }
2117                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2118                                                         /* No more addresses */
2119                                                         break;
2120                                                 }
2121                                         }
2122                                 }
2123                         }
2124                 }
2125         } else {
2126                 struct sctp_laddr *laddr;
2127
2128                 cnt = cnt_inits_to;
2129                 /* First, how many ? */
2130                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2131                         if (laddr->ifa == NULL) {
2132                                 continue;
2133                         }
2134                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2135                                 /*
2136                                  * Address being deleted by the system, dont
2137                                  * list.
2138                                  */
2139                                 continue;
2140                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2141                                 /*
2142                                  * Address being deleted on this ep don't
2143                                  * list.
2144                                  */
2145                                 continue;
2146                         }
2147                         if (sctp_is_address_in_scope(laddr->ifa,
2148                             scope->ipv4_addr_legal,
2149                             scope->ipv6_addr_legal,
2150                             scope->loopback_scope,
2151                             scope->ipv4_local_scope,
2152                             scope->local_scope,
2153                             scope->site_scope, 1) == 0) {
2154                                 continue;
2155                         }
2156                         cnt++;
2157                 }
2158                 /*
2159                  * To get through a NAT we only list addresses if we have
2160                  * more than one. That way if you just bind a single address
2161                  * we let the source of the init dictate our address.
2162                  */
2163                 if (cnt > 1) {
2164                         cnt = cnt_inits_to;
2165                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2166                                 if (laddr->ifa == NULL) {
2167                                         continue;
2168                                 }
2169                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2170                                         continue;
2171                                 }
2172                                 if (sctp_is_address_in_scope(laddr->ifa,
2173                                     scope->ipv4_addr_legal,
2174                                     scope->ipv6_addr_legal,
2175                                     scope->loopback_scope,
2176                                     scope->ipv4_local_scope,
2177                                     scope->local_scope,
2178                                     scope->site_scope, 0) == 0) {
2179                                         continue;
2180                                 }
2181                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2182                                 cnt++;
2183                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2184                                         break;
2185                                 }
2186                         }
2187                 }
2188         }
2189         SCTP_IPI_ADDR_RUNLOCK();
2190         return (m_at);
2191 }
2192
2193 static struct sctp_ifa *
2194 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2195     uint8_t dest_is_loop,
2196     uint8_t dest_is_priv,
2197     sa_family_t fam)
2198 {
2199         uint8_t dest_is_global = 0;
2200
2201         /* dest_is_priv is true if destination is a private address */
2202         /* dest_is_loop is true if destination is a loopback addresses */
2203
2204         /**
2205          * Here we determine if its a preferred address. A preferred address
2206          * means it is the same scope or higher scope then the destination.
2207          * L = loopback, P = private, G = global
2208          * -----------------------------------------
2209          *    src    |  dest | result
2210          *  ----------------------------------------
2211          *     L     |    L  |    yes
2212          *  -----------------------------------------
2213          *     P     |    L  |    yes-v4 no-v6
2214          *  -----------------------------------------
2215          *     G     |    L  |    yes-v4 no-v6
2216          *  -----------------------------------------
2217          *     L     |    P  |    no
2218          *  -----------------------------------------
2219          *     P     |    P  |    yes
2220          *  -----------------------------------------
2221          *     G     |    P  |    no
2222          *   -----------------------------------------
2223          *     L     |    G  |    no
2224          *   -----------------------------------------
2225          *     P     |    G  |    no
2226          *    -----------------------------------------
2227          *     G     |    G  |    yes
2228          *    -----------------------------------------
2229          */
2230
2231         if (ifa->address.sa.sa_family != fam) {
2232                 /* forget mis-matched family */
2233                 return (NULL);
2234         }
2235         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2236                 dest_is_global = 1;
2237         }
2238         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2239         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2240         /* Ok the address may be ok */
2241 #ifdef INET6
2242         if (fam == AF_INET6) {
2243                 /* ok to use deprecated addresses? no lets not! */
2244                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2245                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2246                         return (NULL);
2247                 }
2248                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2249                         if (dest_is_loop) {
2250                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2251                                 return (NULL);
2252                         }
2253                 }
2254                 if (ifa->src_is_glob) {
2255                         if (dest_is_loop) {
2256                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2257                                 return (NULL);
2258                         }
2259                 }
2260         }
2261 #endif
2262         /*
2263          * Now that we know what is what, implement or table this could in
2264          * theory be done slicker (it used to be), but this is
2265          * straightforward and easier to validate :-)
2266          */
2267         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2268             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2269         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2270             dest_is_loop, dest_is_priv, dest_is_global);
2271
2272         if ((ifa->src_is_loop) && (dest_is_priv)) {
2273                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2274                 return (NULL);
2275         }
2276         if ((ifa->src_is_glob) && (dest_is_priv)) {
2277                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2278                 return (NULL);
2279         }
2280         if ((ifa->src_is_loop) && (dest_is_global)) {
2281                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2282                 return (NULL);
2283         }
2284         if ((ifa->src_is_priv) && (dest_is_global)) {
2285                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2286                 return (NULL);
2287         }
2288         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2289         /* its a preferred address */
2290         return (ifa);
2291 }
2292
2293 static struct sctp_ifa *
2294 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2295     uint8_t dest_is_loop,
2296     uint8_t dest_is_priv,
2297     sa_family_t fam)
2298 {
2299         uint8_t dest_is_global = 0;
2300
2301         /**
2302          * Here we determine if its a acceptable address. A acceptable
2303          * address means it is the same scope or higher scope but we can
2304          * allow for NAT which means its ok to have a global dest and a
2305          * private src.
2306          *
2307          * L = loopback, P = private, G = global
2308          * -----------------------------------------
2309          *  src    |  dest | result
2310          * -----------------------------------------
2311          *   L     |   L   |    yes
2312          *  -----------------------------------------
2313          *   P     |   L   |    yes-v4 no-v6
2314          *  -----------------------------------------
2315          *   G     |   L   |    yes
2316          * -----------------------------------------
2317          *   L     |   P   |    no
2318          * -----------------------------------------
2319          *   P     |   P   |    yes
2320          * -----------------------------------------
2321          *   G     |   P   |    yes - May not work
2322          * -----------------------------------------
2323          *   L     |   G   |    no
2324          * -----------------------------------------
2325          *   P     |   G   |    yes - May not work
2326          * -----------------------------------------
2327          *   G     |   G   |    yes
2328          * -----------------------------------------
2329          */
2330
2331         if (ifa->address.sa.sa_family != fam) {
2332                 /* forget non matching family */
2333                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2334                     ifa->address.sa.sa_family, fam);
2335                 return (NULL);
2336         }
2337         /* Ok the address may be ok */
2338         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2339         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2340             dest_is_loop, dest_is_priv);
2341         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2342                 dest_is_global = 1;
2343         }
2344 #ifdef INET6
2345         if (fam == AF_INET6) {
2346                 /* ok to use deprecated addresses? */
2347                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2348                         return (NULL);
2349                 }
2350                 if (ifa->src_is_priv) {
2351                         /* Special case, linklocal to loop */
2352                         if (dest_is_loop)
2353                                 return (NULL);
2354                 }
2355         }
2356 #endif
2357         /*
2358          * Now that we know what is what, implement our table. This could in
2359          * theory be done slicker (it used to be), but this is
2360          * straightforward and easier to validate :-)
2361          */
2362         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2363             ifa->src_is_loop,
2364             dest_is_priv);
2365         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2366                 return (NULL);
2367         }
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2369             ifa->src_is_loop,
2370             dest_is_global);
2371         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2372                 return (NULL);
2373         }
2374         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2375         /* its an acceptable address */
2376         return (ifa);
2377 }
2378
2379 int
2380 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2381 {
2382         struct sctp_laddr *laddr;
2383
2384         if (stcb == NULL) {
2385                 /* There are no restrictions, no TCB :-) */
2386                 return (0);
2387         }
2388         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2389                 if (laddr->ifa == NULL) {
2390                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2391                             __FUNCTION__);
2392                         continue;
2393                 }
2394                 if (laddr->ifa == ifa) {
2395                         /* Yes it is on the list */
2396                         return (1);
2397                 }
2398         }
2399         return (0);
2400 }
2401
2402
2403 int
2404 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2405 {
2406         struct sctp_laddr *laddr;
2407
2408         if (ifa == NULL)
2409                 return (0);
2410         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2411                 if (laddr->ifa == NULL) {
2412                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2413                             __FUNCTION__);
2414                         continue;
2415                 }
2416                 if ((laddr->ifa == ifa) && laddr->action == 0)
2417                         /* same pointer */
2418                         return (1);
2419         }
2420         return (0);
2421 }
2422
2423
2424
2425 static struct sctp_ifa *
2426 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2427     sctp_route_t * ro,
2428     uint32_t vrf_id,
2429     int non_asoc_addr_ok,
2430     uint8_t dest_is_priv,
2431     uint8_t dest_is_loop,
2432     sa_family_t fam)
2433 {
2434         struct sctp_laddr *laddr, *starting_point;
2435         void *ifn;
2436         int resettotop = 0;
2437         struct sctp_ifn *sctp_ifn;
2438         struct sctp_ifa *sctp_ifa, *sifa;
2439         struct sctp_vrf *vrf;
2440         uint32_t ifn_index;
2441
2442         vrf = sctp_find_vrf(vrf_id);
2443         if (vrf == NULL)
2444                 return (NULL);
2445
2446         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2447         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2448         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2449         /*
2450          * first question, is the ifn we will emit on in our list, if so, we
2451          * want such an address. Note that we first looked for a preferred
2452          * address.
2453          */
2454         if (sctp_ifn) {
2455                 /* is a preferred one on the interface we route out? */
2456                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2457                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2458                             (non_asoc_addr_ok == 0))
2459                                 continue;
2460                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2461                             dest_is_loop,
2462                             dest_is_priv, fam);
2463                         if (sifa == NULL)
2464                                 continue;
2465                         if (sctp_is_addr_in_ep(inp, sifa)) {
2466                                 atomic_add_int(&sifa->refcount, 1);
2467                                 return (sifa);
2468                         }
2469                 }
2470         }
2471         /*
2472          * ok, now we now need to find one on the list of the addresses. We
2473          * can't get one on the emitting interface so let's find first a
2474          * preferred one. If not that an acceptable one otherwise... we
2475          * return NULL.
2476          */
2477         starting_point = inp->next_addr_touse;
2478 once_again:
2479         if (inp->next_addr_touse == NULL) {
2480                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2481                 resettotop = 1;
2482         }
2483         for (laddr = inp->next_addr_touse; laddr;
2484             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2485                 if (laddr->ifa == NULL) {
2486                         /* address has been removed */
2487                         continue;
2488                 }
2489                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2490                         /* address is being deleted */
2491                         continue;
2492                 }
2493                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2494                     dest_is_priv, fam);
2495                 if (sifa == NULL)
2496                         continue;
2497                 atomic_add_int(&sifa->refcount, 1);
2498                 return (sifa);
2499         }
2500         if (resettotop == 0) {
2501                 inp->next_addr_touse = NULL;
2502                 goto once_again;
2503         }
2504         inp->next_addr_touse = starting_point;
2505         resettotop = 0;
2506 once_again_too:
2507         if (inp->next_addr_touse == NULL) {
2508                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2509                 resettotop = 1;
2510         }
2511         /* ok, what about an acceptable address in the inp */
2512         for (laddr = inp->next_addr_touse; laddr;
2513             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2514                 if (laddr->ifa == NULL) {
2515                         /* address has been removed */
2516                         continue;
2517                 }
2518                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2519                         /* address is being deleted */
2520                         continue;
2521                 }
2522                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2523                     dest_is_priv, fam);
2524                 if (sifa == NULL)
2525                         continue;
2526                 atomic_add_int(&sifa->refcount, 1);
2527                 return (sifa);
2528         }
2529         if (resettotop == 0) {
2530                 inp->next_addr_touse = NULL;
2531                 goto once_again_too;
2532         }
2533         /*
2534          * no address bound can be a source for the destination we are in
2535          * trouble
2536          */
2537         return (NULL);
2538 }
2539
2540
2541
2542 static struct sctp_ifa *
2543 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2544     struct sctp_tcb *stcb,
2545     sctp_route_t * ro,
2546     uint32_t vrf_id,
2547     uint8_t dest_is_priv,
2548     uint8_t dest_is_loop,
2549     int non_asoc_addr_ok,
2550     sa_family_t fam)
2551 {
2552         struct sctp_laddr *laddr, *starting_point;
2553         void *ifn;
2554         struct sctp_ifn *sctp_ifn;
2555         struct sctp_ifa *sctp_ifa, *sifa;
2556         uint8_t start_at_beginning = 0;
2557         struct sctp_vrf *vrf;
2558         uint32_t ifn_index;
2559
2560         /*
2561          * first question, is the ifn we will emit on in our list, if so, we
2562          * want that one.
2563          */
2564         vrf = sctp_find_vrf(vrf_id);
2565         if (vrf == NULL)
2566                 return (NULL);
2567
2568         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2569         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2570         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2571
2572         /*
2573          * first question, is the ifn we will emit on in our list?  If so,
2574          * we want that one. First we look for a preferred. Second, we go
2575          * for an acceptable.
2576          */
2577         if (sctp_ifn) {
2578                 /* first try for a preferred address on the ep */
2579                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2580                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2581                                 continue;
2582                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2583                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2584                                 if (sifa == NULL)
2585                                         continue;
2586                                 if (((non_asoc_addr_ok == 0) &&
2587                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2588                                     (non_asoc_addr_ok &&
2589                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2590                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2591                                         /* on the no-no list */
2592                                         continue;
2593                                 }
2594                                 atomic_add_int(&sifa->refcount, 1);
2595                                 return (sifa);
2596                         }
2597                 }
2598                 /* next try for an acceptable address on the ep */
2599                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2600                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2601                                 continue;
2602                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2603                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2604                                 if (sifa == NULL)
2605                                         continue;
2606                                 if (((non_asoc_addr_ok == 0) &&
2607                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2608                                     (non_asoc_addr_ok &&
2609                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2610                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2611                                         /* on the no-no list */
2612                                         continue;
2613                                 }
2614                                 atomic_add_int(&sifa->refcount, 1);
2615                                 return (sifa);
2616                         }
2617                 }
2618
2619         }
2620         /*
2621          * if we can't find one like that then we must look at all addresses
2622          * bound to pick one at first preferable then secondly acceptable.
2623          */
2624         starting_point = stcb->asoc.last_used_address;
2625 sctp_from_the_top:
2626         if (stcb->asoc.last_used_address == NULL) {
2627                 start_at_beginning = 1;
2628                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2629         }
2630         /* search beginning with the last used address */
2631         for (laddr = stcb->asoc.last_used_address; laddr;
2632             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2633                 if (laddr->ifa == NULL) {
2634                         /* address has been removed */
2635                         continue;
2636                 }
2637                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2638                         /* address is being deleted */
2639                         continue;
2640                 }
2641                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2642                 if (sifa == NULL)
2643                         continue;
2644                 if (((non_asoc_addr_ok == 0) &&
2645                     (sctp_is_addr_restricted(stcb, sifa))) ||
2646                     (non_asoc_addr_ok &&
2647                     (sctp_is_addr_restricted(stcb, sifa)) &&
2648                     (!sctp_is_addr_pending(stcb, sifa)))) {
2649                         /* on the no-no list */
2650                         continue;
2651                 }
2652                 stcb->asoc.last_used_address = laddr;
2653                 atomic_add_int(&sifa->refcount, 1);
2654                 return (sifa);
2655         }
2656         if (start_at_beginning == 0) {
2657                 stcb->asoc.last_used_address = NULL;
2658                 goto sctp_from_the_top;
2659         }
2660         /* now try for any higher scope than the destination */
2661         stcb->asoc.last_used_address = starting_point;
2662         start_at_beginning = 0;
2663 sctp_from_the_top2:
2664         if (stcb->asoc.last_used_address == NULL) {
2665                 start_at_beginning = 1;
2666                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2667         }
2668         /* search beginning with the last used address */
2669         for (laddr = stcb->asoc.last_used_address; laddr;
2670             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2671                 if (laddr->ifa == NULL) {
2672                         /* address has been removed */
2673                         continue;
2674                 }
2675                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2676                         /* address is being deleted */
2677                         continue;
2678                 }
2679                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2680                     dest_is_priv, fam);
2681                 if (sifa == NULL)
2682                         continue;
2683                 if (((non_asoc_addr_ok == 0) &&
2684                     (sctp_is_addr_restricted(stcb, sifa))) ||
2685                     (non_asoc_addr_ok &&
2686                     (sctp_is_addr_restricted(stcb, sifa)) &&
2687                     (!sctp_is_addr_pending(stcb, sifa)))) {
2688                         /* on the no-no list */
2689                         continue;
2690                 }
2691                 stcb->asoc.last_used_address = laddr;
2692                 atomic_add_int(&sifa->refcount, 1);
2693                 return (sifa);
2694         }
2695         if (start_at_beginning == 0) {
2696                 stcb->asoc.last_used_address = NULL;
2697                 goto sctp_from_the_top2;
2698         }
2699         return (NULL);
2700 }
2701
2702 static struct sctp_ifa *
2703 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2704     struct sctp_tcb *stcb,
2705     int non_asoc_addr_ok,
2706     uint8_t dest_is_loop,
2707     uint8_t dest_is_priv,
2708     int addr_wanted,
2709     sa_family_t fam,
2710     sctp_route_t * ro
2711 )
2712 {
2713         struct sctp_ifa *ifa, *sifa;
2714         int num_eligible_addr = 0;
2715
2716 #ifdef INET6
2717         struct sockaddr_in6 sin6, lsa6;
2718
2719         if (fam == AF_INET6) {
2720                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2721                 (void)sa6_recoverscope(&sin6);
2722         }
2723 #endif                          /* INET6 */
2724         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2725                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2726                     (non_asoc_addr_ok == 0))
2727                         continue;
2728                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2729                     dest_is_priv, fam);
2730                 if (sifa == NULL)
2731                         continue;
2732 #ifdef INET6
2733                 if (fam == AF_INET6 &&
2734                     dest_is_loop &&
2735                     sifa->src_is_loop && sifa->src_is_priv) {
2736                         /*
2737                          * don't allow fe80::1 to be a src on loop ::1, we
2738                          * don't list it to the peer so we will get an
2739                          * abort.
2740                          */
2741                         continue;
2742                 }
2743                 if (fam == AF_INET6 &&
2744                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2745                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2746                         /*
2747                          * link-local <-> link-local must belong to the same
2748                          * scope.
2749                          */
2750                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2751                         (void)sa6_recoverscope(&lsa6);
2752                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2753                                 continue;
2754                         }
2755                 }
2756 #endif                          /* INET6 */
2757
2758                 /*
2759                  * Check if the IPv6 address matches to next-hop. In the
2760                  * mobile case, old IPv6 address may be not deleted from the
2761                  * interface. Then, the interface has previous and new
2762                  * addresses.  We should use one corresponding to the
2763                  * next-hop.  (by micchie)
2764                  */
2765 #ifdef INET6
2766                 if (stcb && fam == AF_INET6 &&
2767                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2768                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2769                             == 0) {
2770                                 continue;
2771                         }
2772                 }
2773 #endif
2774 #ifdef INET
2775                 /* Avoid topologically incorrect IPv4 address */
2776                 if (stcb && fam == AF_INET &&
2777                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2778                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2779                                 continue;
2780                         }
2781                 }
2782 #endif
2783                 if (stcb) {
2784                         if (sctp_is_address_in_scope(ifa,
2785                             stcb->asoc.ipv4_addr_legal,
2786                             stcb->asoc.ipv6_addr_legal,
2787                             stcb->asoc.loopback_scope,
2788                             stcb->asoc.ipv4_local_scope,
2789                             stcb->asoc.local_scope,
2790                             stcb->asoc.site_scope, 0) == 0) {
2791                                 continue;
2792                         }
2793                         if (((non_asoc_addr_ok == 0) &&
2794                             (sctp_is_addr_restricted(stcb, sifa))) ||
2795                             (non_asoc_addr_ok &&
2796                             (sctp_is_addr_restricted(stcb, sifa)) &&
2797                             (!sctp_is_addr_pending(stcb, sifa)))) {
2798                                 /*
2799                                  * It is restricted for some reason..
2800                                  * probably not yet added.
2801                                  */
2802                                 continue;
2803                         }
2804                 }
2805                 if (num_eligible_addr >= addr_wanted) {
2806                         return (sifa);
2807                 }
2808                 num_eligible_addr++;
2809         }
2810         return (NULL);
2811 }
2812
2813
2814 static int
2815 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2816     struct sctp_tcb *stcb,
2817     int non_asoc_addr_ok,
2818     uint8_t dest_is_loop,
2819     uint8_t dest_is_priv,
2820     sa_family_t fam)
2821 {
2822         struct sctp_ifa *ifa, *sifa;
2823         int num_eligible_addr = 0;
2824
2825         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2826                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2827                     (non_asoc_addr_ok == 0)) {
2828                         continue;
2829                 }
2830                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2831                     dest_is_priv, fam);
2832                 if (sifa == NULL) {
2833                         continue;
2834                 }
2835                 if (stcb) {
2836                         if (sctp_is_address_in_scope(ifa,
2837                             stcb->asoc.ipv4_addr_legal,
2838                             stcb->asoc.ipv6_addr_legal,
2839                             stcb->asoc.loopback_scope,
2840                             stcb->asoc.ipv4_local_scope,
2841                             stcb->asoc.local_scope,
2842                             stcb->asoc.site_scope, 0) == 0) {
2843                                 continue;
2844                         }
2845                         if (((non_asoc_addr_ok == 0) &&
2846                             (sctp_is_addr_restricted(stcb, sifa))) ||
2847                             (non_asoc_addr_ok &&
2848                             (sctp_is_addr_restricted(stcb, sifa)) &&
2849                             (!sctp_is_addr_pending(stcb, sifa)))) {
2850                                 /*
2851                                  * It is restricted for some reason..
2852                                  * probably not yet added.
2853                                  */
2854                                 continue;
2855                         }
2856                 }
2857                 num_eligible_addr++;
2858         }
2859         return (num_eligible_addr);
2860 }
2861
2862 static struct sctp_ifa *
2863 sctp_choose_boundall(struct sctp_tcb *stcb,
2864     struct sctp_nets *net,
2865     sctp_route_t * ro,
2866     uint32_t vrf_id,
2867     uint8_t dest_is_priv,
2868     uint8_t dest_is_loop,
2869     int non_asoc_addr_ok,
2870     sa_family_t fam)
2871 {
2872         int cur_addr_num = 0, num_preferred = 0;
2873         void *ifn;
2874         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2875         struct sctp_ifa *sctp_ifa, *sifa;
2876         uint32_t ifn_index;
2877         struct sctp_vrf *vrf;
2878
2879 #ifdef INET
2880         int retried = 0;
2881
2882 #endif
2883
2884         /*-
2885          * For boundall we can use any address in the association.
2886          * If non_asoc_addr_ok is set we can use any address (at least in
2887          * theory). So we look for preferred addresses first. If we find one,
2888          * we use it. Otherwise we next try to get an address on the
2889          * interface, which we should be able to do (unless non_asoc_addr_ok
2890          * is false and we are routed out that way). In these cases where we
2891          * can't use the address of the interface we go through all the
2892          * ifn's looking for an address we can use and fill that in. Punting
2893          * means we send back address 0, which will probably cause problems
2894          * actually since then IP will fill in the address of the route ifn,
2895          * which means we probably already rejected it.. i.e. here comes an
2896          * abort :-<.
2897          */
2898         vrf = sctp_find_vrf(vrf_id);
2899         if (vrf == NULL)
2900                 return (NULL);
2901
2902         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2903         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2904         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2905         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2906         if (sctp_ifn == NULL) {
2907                 /* ?? We don't have this guy ?? */
2908                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2909                 goto bound_all_plan_b;
2910         }
2911         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2912             ifn_index, sctp_ifn->ifn_name);
2913
2914         if (net) {
2915                 cur_addr_num = net->indx_of_eligible_next_to_use;
2916         }
2917         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2918             stcb,
2919             non_asoc_addr_ok,
2920             dest_is_loop,
2921             dest_is_priv, fam);
2922         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2923             num_preferred, sctp_ifn->ifn_name);
2924         if (num_preferred == 0) {
2925                 /*
2926                  * no eligible addresses, we must use some other interface
2927                  * address if we can find one.
2928                  */
2929                 goto bound_all_plan_b;
2930         }
2931         /*
2932          * Ok we have num_eligible_addr set with how many we can use, this
2933          * may vary from call to call due to addresses being deprecated
2934          * etc..
2935          */
2936         if (cur_addr_num >= num_preferred) {
2937                 cur_addr_num = 0;
2938         }
2939         /*
2940          * select the nth address from the list (where cur_addr_num is the
2941          * nth) and 0 is the first one, 1 is the second one etc...
2942          */
2943         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2944
2945         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2946             dest_is_priv, cur_addr_num, fam, ro);
2947
2948         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2949         if (sctp_ifa) {
2950                 atomic_add_int(&sctp_ifa->refcount, 1);
2951                 if (net) {
2952                         /* save off where the next one we will want */
2953                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2954                 }
2955                 return (sctp_ifa);
2956         }
2957         /*
2958          * plan_b: Look at all interfaces and find a preferred address. If
2959          * no preferred fall through to plan_c.
2960          */
2961 bound_all_plan_b:
2962         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2963         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2964                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2965                     sctp_ifn->ifn_name);
2966                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2967                         /* wrong base scope */
2968                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2969                         continue;
2970                 }
2971                 if ((sctp_ifn == looked_at) && looked_at) {
2972                         /* already looked at this guy */
2973                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2974                         continue;
2975                 }
2976                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2977                     dest_is_loop, dest_is_priv, fam);
2978                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2979                     "Found ifn:%p %d preferred source addresses\n",
2980                     ifn, num_preferred);
2981                 if (num_preferred == 0) {
2982                         /* None on this interface. */
2983                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2984                         continue;
2985                 }
2986                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2987                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2988                     num_preferred, sctp_ifn, cur_addr_num);
2989
2990                 /*
2991                  * Ok we have num_eligible_addr set with how many we can
2992                  * use, this may vary from call to call due to addresses
2993                  * being deprecated etc..
2994                  */
2995                 if (cur_addr_num >= num_preferred) {
2996                         cur_addr_num = 0;
2997                 }
2998                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2999                     dest_is_priv, cur_addr_num, fam, ro);
3000                 if (sifa == NULL)
3001                         continue;
3002                 if (net) {
3003                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3004                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3005                             cur_addr_num);
3006                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3007                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3008                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3009                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3010                 }
3011                 atomic_add_int(&sifa->refcount, 1);
3012                 return (sifa);
3013         }
3014 #ifdef INET
3015 again_with_private_addresses_allowed:
3016 #endif
3017         /* plan_c: do we have an acceptable address on the emit interface */
3018         sifa = NULL;
3019         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3020         if (emit_ifn == NULL) {
3021                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3022                 goto plan_d;
3023         }
3024         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3025                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", sctp_ifa);
3026                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3027                     (non_asoc_addr_ok == 0)) {
3028                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3029                         continue;
3030                 }
3031                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3032                     dest_is_priv, fam);
3033                 if (sifa == NULL) {
3034                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3035                         continue;
3036                 }
3037                 if (stcb) {
3038                         if (sctp_is_address_in_scope(sifa,
3039                             stcb->asoc.ipv4_addr_legal,
3040                             stcb->asoc.ipv6_addr_legal,
3041                             stcb->asoc.loopback_scope,
3042                             stcb->asoc.ipv4_local_scope,
3043                             stcb->asoc.local_scope,
3044                             stcb->asoc.site_scope, 0) == 0) {
3045                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3046                                 sifa = NULL;
3047                                 continue;
3048                         }
3049                         if (((non_asoc_addr_ok == 0) &&
3050                             (sctp_is_addr_restricted(stcb, sifa))) ||
3051                             (non_asoc_addr_ok &&
3052                             (sctp_is_addr_restricted(stcb, sifa)) &&
3053                             (!sctp_is_addr_pending(stcb, sifa)))) {
3054                                 /*
3055                                  * It is restricted for some reason..
3056                                  * probably not yet added.
3057                                  */
3058                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3059                                 sifa = NULL;
3060                                 continue;
3061                         }
3062                 } else {
3063                         SCTP_PRINTF("Stcb is null - no print\n");
3064                 }
3065                 atomic_add_int(&sifa->refcount, 1);
3066                 goto out;
3067         }
3068 plan_d:
3069         /*
3070          * plan_d: We are in trouble. No preferred address on the emit
3071          * interface. And not even a preferred address on all interfaces. Go
3072          * out and see if we can find an acceptable address somewhere
3073          * amongst all interfaces.
3074          */
3075         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", looked_at);
3076         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3077                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3078                         /* wrong base scope */
3079                         continue;
3080                 }
3081                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3082                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3083                             (non_asoc_addr_ok == 0))
3084                                 continue;
3085                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3086                             dest_is_loop,
3087                             dest_is_priv, fam);
3088                         if (sifa == NULL)
3089                                 continue;
3090                         if (stcb) {
3091                                 if (sctp_is_address_in_scope(sifa,
3092                                     stcb->asoc.ipv4_addr_legal,
3093                                     stcb->asoc.ipv6_addr_legal,
3094                                     stcb->asoc.loopback_scope,
3095                                     stcb->asoc.ipv4_local_scope,
3096                                     stcb->asoc.local_scope,
3097                                     stcb->asoc.site_scope, 0) == 0) {
3098                                         sifa = NULL;
3099                                         continue;
3100                                 }
3101                                 if (((non_asoc_addr_ok == 0) &&
3102                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3103                                     (non_asoc_addr_ok &&
3104                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3105                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3106                                         /*
3107                                          * It is restricted for some
3108                                          * reason.. probably not yet added.
3109                                          */
3110                                         sifa = NULL;
3111                                         continue;
3112                                 }
3113                         }
3114                         goto out;
3115                 }
3116         }
3117 #ifdef INET
3118         if ((retried == 0) && (stcb->asoc.ipv4_local_scope == 0)) {
3119                 stcb->asoc.ipv4_local_scope = 1;
3120                 retried = 1;
3121                 goto again_with_private_addresses_allowed;
3122         } else if (retried == 1) {
3123                 stcb->asoc.ipv4_local_scope = 0;
3124         }
3125 #endif
3126 out:
3127 #ifdef INET
3128         if (sifa) {
3129                 if (retried == 1) {
3130                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3131                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3132                                         /* wrong base scope */
3133                                         continue;
3134                                 }
3135                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3136                                         struct sctp_ifa *tmp_sifa;
3137
3138                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3139                                             (non_asoc_addr_ok == 0))
3140                                                 continue;
3141                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3142                                             dest_is_loop,
3143                                             dest_is_priv, fam);
3144                                         if (tmp_sifa == NULL) {
3145                                                 continue;
3146                                         }
3147                                         if (tmp_sifa == sifa) {
3148                                                 continue;
3149                                         }
3150                                         if (stcb) {
3151                                                 if (sctp_is_address_in_scope(tmp_sifa,
3152                                                     stcb->asoc.ipv4_addr_legal,
3153                                                     stcb->asoc.ipv6_addr_legal,
3154                                                     stcb->asoc.loopback_scope,
3155                                                     stcb->asoc.ipv4_local_scope,
3156                                                     stcb->asoc.local_scope,
3157                                                     stcb->asoc.site_scope, 0) == 0) {
3158                                                         continue;
3159                                                 }
3160                                                 if (((non_asoc_addr_ok == 0) &&
3161                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3162                                                     (non_asoc_addr_ok &&
3163                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3164                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3165                                                         /*
3166                                                          * It is restricted
3167                                                          * for some reason..
3168                                                          * probably not yet
3169                                                          * added.
3170                                                          */
3171                                                         continue;
3172                                                 }
3173                                         }
3174                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3175                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3176                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3177                                         }
3178                                 }
3179                         }
3180                 }
3181                 atomic_add_int(&sifa->refcount, 1);
3182         }
3183 #endif
3184         return (sifa);
3185 }
3186
3187
3188
3189 /* tcb may be NULL */
3190 struct sctp_ifa *
3191 sctp_source_address_selection(struct sctp_inpcb *inp,
3192     struct sctp_tcb *stcb,
3193     sctp_route_t * ro,
3194     struct sctp_nets *net,
3195     int non_asoc_addr_ok, uint32_t vrf_id)
3196 {
3197         struct sctp_ifa *answer;
3198         uint8_t dest_is_priv, dest_is_loop;
3199         sa_family_t fam;
3200
3201 #ifdef INET
3202         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3203
3204 #endif
3205 #ifdef INET6
3206         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3207
3208 #endif
3209
3210         /**
3211          * Rules: - Find the route if needed, cache if I can. - Look at
3212          * interface address in route, Is it in the bound list. If so we
3213          * have the best source. - If not we must rotate amongst the
3214          * addresses.
3215          *
3216          * Cavets and issues
3217          *
3218          * Do we need to pay attention to scope. We can have a private address
3219          * or a global address we are sourcing or sending to. So if we draw
3220          * it out
3221          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3222          * For V4
3223          * ------------------------------------------
3224          *      source     *      dest  *  result
3225          * -----------------------------------------
3226          * <a>  Private    *    Global  *  NAT
3227          * -----------------------------------------
3228          * <b>  Private    *    Private *  No problem
3229          * -----------------------------------------
3230          * <c>  Global     *    Private *  Huh, How will this work?
3231          * -----------------------------------------
3232          * <d>  Global     *    Global  *  No Problem
3233          *------------------------------------------
3234          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3235          * For V6
3236          *------------------------------------------
3237          *      source     *      dest  *  result
3238          * -----------------------------------------
3239          * <a>  Linklocal  *    Global  *
3240          * -----------------------------------------
3241          * <b>  Linklocal  * Linklocal  *  No problem
3242          * -----------------------------------------
3243          * <c>  Global     * Linklocal  *  Huh, How will this work?
3244          * -----------------------------------------
3245          * <d>  Global     *    Global  *  No Problem
3246          *------------------------------------------
3247          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3248          *
3249          * And then we add to that what happens if there are multiple addresses
3250          * assigned to an interface. Remember the ifa on a ifn is a linked
3251          * list of addresses. So one interface can have more than one IP
3252          * address. What happens if we have both a private and a global
3253          * address? Do we then use context of destination to sort out which
3254          * one is best? And what about NAT's sending P->G may get you a NAT
3255          * translation, or should you select the G thats on the interface in
3256          * preference.
3257          *
3258          * Decisions:
3259          *
3260          * - count the number of addresses on the interface.
3261          * - if it is one, no problem except case <c>.
3262          *   For <a> we will assume a NAT out there.
3263          * - if there are more than one, then we need to worry about scope P
3264          *   or G. We should prefer G -> G and P -> P if possible.
3265          *   Then as a secondary fall back to mixed types G->P being a last
3266          *   ditch one.
3267          * - The above all works for bound all, but bound specific we need to
3268          *   use the same concept but instead only consider the bound
3269          *   addresses. If the bound set is NOT assigned to the interface then
3270          *   we must use rotation amongst the bound addresses..
3271          */
3272         if (ro->ro_rt == NULL) {
3273                 /*
3274                  * Need a route to cache.
3275                  */
3276                 SCTP_RTALLOC(ro, vrf_id);
3277         }
3278         if (ro->ro_rt == NULL) {
3279                 return (NULL);
3280         }
3281         fam = ro->ro_dst.sa_family;
3282         dest_is_priv = dest_is_loop = 0;
3283         /* Setup our scopes for the destination */
3284         switch (fam) {
3285 #ifdef INET
3286         case AF_INET:
3287                 /* Scope based on outbound address */
3288                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3289                         dest_is_loop = 1;
3290                         if (net != NULL) {
3291                                 /* mark it as local */
3292                                 net->addr_is_local = 1;
3293                         }
3294                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3295                         dest_is_priv = 1;
3296                 }
3297                 break;
3298 #endif
3299 #ifdef INET6
3300         case AF_INET6:
3301                 /* Scope based on outbound address */
3302                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3303                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3304                         /*
3305                          * If the address is a loopback address, which
3306                          * consists of "::1" OR "fe80::1%lo0", we are
3307                          * loopback scope. But we don't use dest_is_priv
3308                          * (link local addresses).
3309                          */
3310                         dest_is_loop = 1;
3311                         if (net != NULL) {
3312                                 /* mark it as local */
3313                                 net->addr_is_local = 1;
3314                         }
3315                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3316                         dest_is_priv = 1;
3317                 }
3318                 break;
3319 #endif
3320         }
3321         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3322         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3323         SCTP_IPI_ADDR_RLOCK();
3324         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3325                 /*
3326                  * Bound all case
3327                  */
3328                 answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3329                     dest_is_priv, dest_is_loop,
3330                     non_asoc_addr_ok, fam);
3331                 SCTP_IPI_ADDR_RUNLOCK();
3332                 return (answer);
3333         }
3334         /*
3335          * Subset bound case
3336          */
3337         if (stcb) {
3338                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3339                     vrf_id, dest_is_priv,
3340                     dest_is_loop,
3341                     non_asoc_addr_ok, fam);
3342         } else {
3343                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3344                     non_asoc_addr_ok,
3345                     dest_is_priv,
3346                     dest_is_loop, fam);
3347         }
3348         SCTP_IPI_ADDR_RUNLOCK();
3349         return (answer);
3350 }
3351
3352 static int
3353 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3354 {
3355         struct cmsghdr cmh;
3356         int tlen, at, found;
3357         struct sctp_sndinfo sndinfo;
3358         struct sctp_prinfo prinfo;
3359         struct sctp_authinfo authinfo;
3360
3361         tlen = SCTP_BUF_LEN(control);
3362         at = 0;
3363         found = 0;
3364         /*
3365          * Independent of how many mbufs, find the c_type inside the control
3366          * structure and copy out the data.
3367          */
3368         while (at < tlen) {
3369                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3370                         /* There is not enough room for one more. */
3371                         return (found);
3372                 }
3373                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3374                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3375                         /* We dont't have a complete CMSG header. */
3376                         return (found);
3377                 }
3378                 if (((int)cmh.cmsg_len + at) > tlen) {
3379                         /* We don't have the complete CMSG. */
3380                         return (found);
3381                 }
3382                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3383                     ((c_type == cmh.cmsg_type) ||
3384                     ((c_type == SCTP_SNDRCV) &&
3385                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3386                     (cmh.cmsg_type == SCTP_PRINFO) ||
3387                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3388                         if (c_type == cmh.cmsg_type) {
3389                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3390                                         return (found);
3391                                 }
3392                                 /* It is exactly what we want. Copy it out. */
3393                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), cpsize, (caddr_t)data);
3394                                 return (1);
3395                         } else {
3396                                 struct sctp_sndrcvinfo *sndrcvinfo;
3397
3398                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3399                                 if (found == 0) {
3400                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3401                                                 return (found);
3402                                         }
3403                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3404                                 }
3405                                 switch (cmh.cmsg_type) {
3406                                 case SCTP_SNDINFO:
3407                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_sndinfo)) {
3408                                                 return (found);
3409                                         }
3410                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3411                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3412                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3413                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3414                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3415                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3416                                         break;
3417                                 case SCTP_PRINFO:
3418                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_prinfo)) {
3419                                                 return (found);
3420                                         }
3421                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3422                                         sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3423                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3424                                         break;
3425                                 case SCTP_AUTHINFO:
3426                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_authinfo)) {
3427                                                 return (found);
3428                                         }
3429                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3430                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3431                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3432                                         break;
3433                                 default:
3434                                         return (found);
3435                                 }
3436                                 found = 1;
3437                         }
3438                 }
3439                 at += CMSG_ALIGN(cmh.cmsg_len);
3440         }
3441         return (found);
3442 }
3443
3444 static int
3445 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3446 {
3447         struct cmsghdr cmh;
3448         int tlen, at;
3449         struct sctp_initmsg initmsg;
3450
3451 #ifdef INET
3452         struct sockaddr_in sin;
3453
3454 #endif
3455 #ifdef INET6
3456         struct sockaddr_in6 sin6;
3457
3458 #endif
3459
3460         tlen = SCTP_BUF_LEN(control);
3461         at = 0;
3462         while (at < tlen) {
3463                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3464                         /* There is not enough room for one more. */
3465                         *error = EINVAL;
3466                         return (1);
3467                 }
3468                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3469                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3470                         /* We dont't have a complete CMSG header. */
3471                         *error = EINVAL;
3472                         return (1);
3473                 }
3474                 if (((int)cmh.cmsg_len + at) > tlen) {
3475                         /* We don't have the complete CMSG. */
3476                         *error = EINVAL;
3477                         return (1);
3478                 }
3479                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3480                         switch (cmh.cmsg_type) {
3481                         case SCTP_INIT:
3482                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_initmsg)) {
3483                                         *error = EINVAL;
3484                                         return (1);
3485                                 }
3486                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3487                                 if (initmsg.sinit_max_attempts)
3488                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3489                                 if (initmsg.sinit_num_ostreams)
3490                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3491                                 if (initmsg.sinit_max_instreams)
3492                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3493                                 if (initmsg.sinit_max_init_timeo)
3494                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3495                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3496                                         struct sctp_stream_out *tmp_str;
3497                                         unsigned int i;
3498
3499                                         /* Default is NOT correct */
3500                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3501                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3502                                         SCTP_TCB_UNLOCK(stcb);
3503                                         SCTP_MALLOC(tmp_str,
3504                                             struct sctp_stream_out *,
3505                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3506                                             SCTP_M_STRMO);
3507                                         SCTP_TCB_LOCK(stcb);
3508                                         if (tmp_str != NULL) {
3509                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3510                                                 stcb->asoc.strmout = tmp_str;
3511                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3512                                         } else {
3513                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3514                                         }
3515                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3516                                                 stcb->asoc.strmout[i].next_sequence_sent = 0;
3517                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3518                                                 stcb->asoc.strmout[i].stream_no = i;
3519                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3520                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3521                                         }
3522                                 }
3523                                 break;
3524 #ifdef INET
3525                         case SCTP_DSTADDRV4:
3526                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3527                                         *error = EINVAL;
3528                                         return (1);
3529                                 }
3530                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3531                                 sin.sin_family = AF_INET;
3532                                 sin.sin_len = sizeof(struct sockaddr_in);
3533                                 sin.sin_port = stcb->rport;
3534                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3535                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3536                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3537                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3538                                         *error = EINVAL;
3539                                         return (1);
3540                                 }
3541                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3542                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3543                                         *error = ENOBUFS;
3544                                         return (1);
3545                                 }
3546                                 break;
3547 #endif
3548 #ifdef INET6
3549                         case SCTP_DSTADDRV6:
3550                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3551                                         *error = EINVAL;
3552                                         return (1);
3553                                 }
3554                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3555                                 sin6.sin6_family = AF_INET6;
3556                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3557                                 sin6.sin6_port = stcb->rport;
3558                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3559                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3560                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3561                                         *error = EINVAL;
3562                                         return (1);
3563                                 }
3564 #ifdef INET
3565                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3566                                         in6_sin6_2_sin(&sin, &sin6);
3567                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3568                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3569                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3570                                                 *error = EINVAL;
3571                                                 return (1);
3572                                         }
3573                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3574                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3575                                                 *error = ENOBUFS;
3576                                                 return (1);
3577                                         }
3578                                 } else
3579 #endif
3580                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3581                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3582                                         *error = ENOBUFS;
3583                                         return (1);
3584                                 }
3585                                 break;
3586 #endif
3587                         default:
3588                                 break;
3589                         }
3590                 }
3591                 at += CMSG_ALIGN(cmh.cmsg_len);
3592         }
3593         return (0);
3594 }
3595
3596 static struct sctp_tcb *
3597 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3598     in_port_t port,
3599     struct mbuf *control,
3600     struct sctp_nets **net_p,
3601     int *error)
3602 {
3603         struct cmsghdr cmh;
3604         int tlen, at;
3605         struct sctp_tcb *stcb;
3606         struct sockaddr *addr;
3607
3608 #ifdef INET
3609         struct sockaddr_in sin;
3610
3611 #endif
3612 #ifdef INET6
3613         struct sockaddr_in6 sin6;
3614
3615 #endif
3616
3617         tlen = SCTP_BUF_LEN(control);
3618         at = 0;
3619         while (at < tlen) {
3620                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3621                         /* There is not enough room for one more. */
3622                         *error = EINVAL;
3623                         return (NULL);
3624                 }
3625                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3626                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3627                         /* We dont't have a complete CMSG header. */
3628                         *error = EINVAL;
3629                         return (NULL);
3630                 }
3631                 if (((int)cmh.cmsg_len + at) > tlen) {
3632                         /* We don't have the complete CMSG. */
3633                         *error = EINVAL;
3634                         return (NULL);
3635                 }
3636                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3637                         switch (cmh.cmsg_type) {
3638 #ifdef INET
3639                         case SCTP_DSTADDRV4:
3640                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3641                                         *error = EINVAL;
3642                                         return (NULL);
3643                                 }
3644                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3645                                 sin.sin_family = AF_INET;
3646                                 sin.sin_len = sizeof(struct sockaddr_in);
3647                                 sin.sin_port = port;
3648                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3649                                 addr = (struct sockaddr *)&sin;
3650                                 break;
3651 #endif
3652 #ifdef INET6
3653                         case SCTP_DSTADDRV6:
3654                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3655                                         *error = EINVAL;
3656                                         return (NULL);
3657                                 }
3658                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3659                                 sin6.sin6_family = AF_INET6;
3660                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3661                                 sin6.sin6_port = port;
3662                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3663 #ifdef INET
3664                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3665                                         in6_sin6_2_sin(&sin, &sin6);
3666                                         addr = (struct sockaddr *)&sin;
3667                                 } else
3668 #endif
3669                                         addr = (struct sockaddr *)&sin6;
3670                                 break;
3671 #endif
3672                         default:
3673                                 addr = NULL;
3674                                 break;
3675                         }
3676                         if (addr) {
3677                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3678                                 if (stcb != NULL) {
3679                                         return (stcb);
3680                                 }
3681                         }
3682                 }
3683                 at += CMSG_ALIGN(cmh.cmsg_len);
3684         }
3685         return (NULL);
3686 }
3687
3688 static struct mbuf *
3689 sctp_add_cookie(struct mbuf *init, int init_offset,
3690     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3691 {
3692         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3693         struct sctp_state_cookie *stc;
3694         struct sctp_paramhdr *ph;
3695         uint8_t *foo;
3696         int sig_offset;
3697         uint16_t cookie_sz;
3698
3699         mret = NULL;
3700         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3701             sizeof(struct sctp_paramhdr)), 0,
3702             M_DONTWAIT, 1, MT_DATA);
3703         if (mret == NULL) {
3704                 return (NULL);
3705         }
3706         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3707         if (copy_init == NULL) {
3708                 sctp_m_freem(mret);
3709                 return (NULL);
3710         }
3711 #ifdef SCTP_MBUF_LOGGING
3712         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3713                 struct mbuf *mat;
3714
3715                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3716                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3717                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3718                         }
3719                 }
3720         }
3721 #endif
3722         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3723             M_DONTWAIT);
3724         if (copy_initack == NULL) {
3725                 sctp_m_freem(mret);
3726                 sctp_m_freem(copy_init);
3727                 return (NULL);
3728         }
3729 #ifdef SCTP_MBUF_LOGGING
3730         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3731                 struct mbuf *mat;
3732
3733                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3734                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3735                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3736                         }
3737                 }
3738         }
3739 #endif
3740         /* easy side we just drop it on the end */
3741         ph = mtod(mret, struct sctp_paramhdr *);
3742         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3743             sizeof(struct sctp_paramhdr);
3744         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3745             sizeof(struct sctp_paramhdr));
3746         ph->param_type = htons(SCTP_STATE_COOKIE);
3747         ph->param_length = 0;   /* fill in at the end */
3748         /* Fill in the stc cookie data */
3749         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3750
3751         /* tack the INIT and then the INIT-ACK onto the chain */
3752         cookie_sz = 0;
3753         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3754                 cookie_sz += SCTP_BUF_LEN(m_at);
3755                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3756                         SCTP_BUF_NEXT(m_at) = copy_init;
3757                         break;
3758                 }
3759         }
3760         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3761                 cookie_sz += SCTP_BUF_LEN(m_at);
3762                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3763                         SCTP_BUF_NEXT(m_at) = copy_initack;
3764                         break;
3765                 }
3766         }
3767         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3768                 cookie_sz += SCTP_BUF_LEN(m_at);
3769                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3770                         break;
3771                 }
3772         }
3773         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3774         if (sig == NULL) {
3775                 /* no space, so free the entire chain */
3776                 sctp_m_freem(mret);
3777                 return (NULL);
3778         }
3779         SCTP_BUF_LEN(sig) = 0;
3780         SCTP_BUF_NEXT(m_at) = sig;
3781         sig_offset = 0;
3782         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3783         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3784         *signature = foo;
3785         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3786         cookie_sz += SCTP_SIGNATURE_SIZE;
3787         ph->param_length = htons(cookie_sz);
3788         return (mret);
3789 }
3790
3791
3792 static uint8_t
3793 sctp_get_ect(struct sctp_tcb *stcb)
3794 {
3795         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3796                 return (SCTP_ECT0_BIT);
3797         } else {
3798                 return (0);
3799         }
3800 }
3801
3802 static void
3803 sctp_handle_no_route(struct sctp_tcb *stcb,
3804     struct sctp_nets *net,
3805     int so_locked)
3806 {
3807         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3808
3809         if (net) {
3810                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3811                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3812                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3813                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3814                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3815                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3816                                     stcb, 0,
3817                                     (void *)net,
3818                                     so_locked);
3819                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3820                                 net->dest_state &= ~SCTP_ADDR_PF;
3821                         }
3822                 }
3823                 if (stcb) {
3824                         if (net == stcb->asoc.primary_destination) {
3825                                 /* need a new primary */
3826                                 struct sctp_nets *alt;
3827
3828                                 alt = sctp_find_alternate_net(stcb, net, 0);
3829                                 if (alt != net) {
3830                                         if (stcb->asoc.alternate) {
3831                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3832                                         }
3833                                         stcb->asoc.alternate = alt;
3834                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3835                                         if (net->ro._s_addr) {
3836                                                 sctp_free_ifa(net->ro._s_addr);
3837                                                 net->ro._s_addr = NULL;
3838                                         }
3839                                         net->src_addr_selected = 0;
3840                                 }
3841                         }
3842                 }
3843         }
3844 }
3845
3846 static int
3847 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3848     struct sctp_tcb *stcb,      /* may be NULL */
3849     struct sctp_nets *net,
3850     struct sockaddr *to,
3851     struct mbuf *m,
3852     uint32_t auth_offset,
3853     struct sctp_auth_chunk *auth,
3854     uint16_t auth_keyid,
3855     int nofragment_flag,
3856     int ecn_ok,
3857     int out_of_asoc_ok,
3858     uint16_t src_port,
3859     uint16_t dest_port,
3860     uint32_t v_tag,
3861     uint16_t port,
3862 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3863     int so_locked SCTP_UNUSED,
3864 #else
3865     int so_locked,
3866 #endif
3867     union sctp_sockstore *over_addr,
3868     struct mbuf *init
3869 )
3870 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3871 {
3872         /**
3873          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3874          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3875          * - fill in the HMAC digest of any AUTH chunk in the packet.
3876          * - calculate and fill in the SCTP checksum.
3877          * - prepend an IP address header.
3878          * - if boundall use INADDR_ANY.
3879          * - if boundspecific do source address selection.
3880          * - set fragmentation option for ipV4.
3881          * - On return from IP output, check/adjust mtu size of output
3882          *   interface and smallest_mtu size as well.
3883          */
3884         /* Will need ifdefs around this */
3885         struct mbuf *o_pak;
3886         struct mbuf *newm;
3887         struct sctphdr *sctphdr;
3888         int packet_length;
3889         int ret;
3890         uint32_t vrf_id;
3891         sctp_route_t *ro = NULL;
3892         struct udphdr *udp = NULL;
3893         uint8_t tos_value;
3894
3895 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3896         struct socket *so = NULL;
3897
3898 #endif
3899
3900         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3901                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3902                 sctp_m_freem(m);
3903                 return (EFAULT);
3904         }
3905         if (stcb) {
3906                 vrf_id = stcb->asoc.vrf_id;
3907         } else {
3908                 vrf_id = inp->def_vrf_id;
3909         }
3910
3911         /* fill in the HMAC digest for any AUTH chunk in the packet */
3912         if ((auth != NULL) && (stcb != NULL)) {
3913                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3914         }
3915         if (net) {
3916                 tos_value = net->dscp;
3917         } else if (stcb) {
3918                 tos_value = stcb->asoc.default_dscp;
3919         } else {
3920                 tos_value = inp->sctp_ep.default_dscp;
3921         }
3922
3923         switch (to->sa_family) {
3924 #ifdef INET
3925         case AF_INET:
3926                 {
3927                         struct ip *ip = NULL;
3928                         sctp_route_t iproute;
3929                         int len;
3930
3931                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3932                         if (port) {
3933                                 len += sizeof(struct udphdr);
3934                         }
3935                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3936                         if (newm == NULL) {
3937                                 sctp_m_freem(m);
3938                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3939                                 return (ENOMEM);
3940                         }
3941                         SCTP_ALIGN_TO_END(newm, len);
3942                         SCTP_BUF_LEN(newm) = len;
3943                         SCTP_BUF_NEXT(newm) = m;
3944                         m = newm;
3945                         if (net != NULL) {
3946 #ifdef INVARIANTS
3947                                 if (net->flowidset == 0) {
3948                                         panic("Flow ID not set");
3949                                 }
3950 #endif
3951                                 m->m_pkthdr.flowid = net->flowid;
3952                                 m->m_flags |= M_FLOWID;
3953                         } else {
3954                                 if ((init != NULL) && (init->m_flags & M_FLOWID)) {
3955                                         m->m_pkthdr.flowid = init->m_pkthdr.flowid;
3956                                         m->m_flags |= M_FLOWID;
3957                                 }
3958                         }
3959                         packet_length = sctp_calculate_len(m);
3960                         ip = mtod(m, struct ip *);
3961                         ip->ip_v = IPVERSION;
3962                         ip->ip_hl = (sizeof(struct ip) >> 2);
3963                         if (tos_value == 0) {
3964                                 /*
3965                                  * This means especially, that it is not set
3966                                  * at the SCTP layer. So use the value from
3967                                  * the IP layer.
3968                                  */
3969                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3970                         }
3971                         tos_value &= 0xfc;
3972                         if (ecn_ok) {
3973                                 tos_value |= sctp_get_ect(stcb);
3974                         }
3975                         if ((nofragment_flag) && (port == 0)) {
3976                                 ip->ip_off = IP_DF;
3977                         } else
3978                                 ip->ip_off = 0;
3979
3980                         /* FreeBSD has a function for ip_id's */
3981                         ip->ip_id = ip_newid();
3982
3983                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3984                         ip->ip_len = packet_length;
3985                         ip->ip_tos = tos_value;
3986                         if (port) {
3987                                 ip->ip_p = IPPROTO_UDP;
3988                         } else {
3989                                 ip->ip_p = IPPROTO_SCTP;
3990                         }
3991                         ip->ip_sum = 0;
3992                         if (net == NULL) {
3993                                 ro = &iproute;
3994                                 memset(&iproute, 0, sizeof(iproute));
3995                                 memcpy(&ro->ro_dst, to, to->sa_len);
3996                         } else {
3997                                 ro = (sctp_route_t *) & net->ro;
3998                         }
3999                         /* Now the address selection part */
4000                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4001
4002                         /* call the routine to select the src address */
4003                         if (net && out_of_asoc_ok == 0) {
4004                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4005                                         sctp_free_ifa(net->ro._s_addr);
4006                                         net->ro._s_addr = NULL;
4007                                         net->src_addr_selected = 0;
4008                                         if (ro->ro_rt) {
4009                                                 RTFREE(ro->ro_rt);
4010                                                 ro->ro_rt = NULL;
4011                                         }
4012                                 }
4013                                 if (net->src_addr_selected == 0) {
4014                                         /* Cache the source address */
4015                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4016                                             ro, net, 0,
4017                                             vrf_id);
4018                                         net->src_addr_selected = 1;
4019                                 }
4020                                 if (net->ro._s_addr == NULL) {
4021                                         /* No route to host */
4022                                         net->src_addr_selected = 0;
4023                                         sctp_handle_no_route(stcb, net, so_locked);
4024                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4025                                         sctp_m_freem(m);
4026                                         return (EHOSTUNREACH);
4027                                 }
4028                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4029                         } else {
4030                                 if (over_addr == NULL) {
4031                                         struct sctp_ifa *_lsrc;
4032
4033                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4034                                             net,
4035                                             out_of_asoc_ok,
4036                                             vrf_id);
4037                                         if (_lsrc == NULL) {
4038                                                 sctp_handle_no_route(stcb, net, so_locked);
4039                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4040                                                 sctp_m_freem(m);
4041                                                 return (EHOSTUNREACH);
4042                                         }
4043                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4044                                         sctp_free_ifa(_lsrc);
4045                                 } else {
4046                                         ip->ip_src = over_addr->sin.sin_addr;
4047                                         SCTP_RTALLOC(ro, vrf_id);
4048                                 }
4049                         }
4050                         if (port) {
4051                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4052                                         sctp_handle_no_route(stcb, net, so_locked);
4053                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4054                                         sctp_m_freem(m);
4055                                         return (EHOSTUNREACH);
4056                                 }
4057                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4058                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4059                                 udp->uh_dport = port;
4060                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4061                                 if (V_udp_cksum) {
4062                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4063                                 } else {
4064                                         udp->uh_sum = 0;
4065                                 }
4066                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4067                         } else {
4068                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4069                         }
4070
4071                         sctphdr->src_port = src_port;
4072                         sctphdr->dest_port = dest_port;
4073                         sctphdr->v_tag = v_tag;
4074                         sctphdr->checksum = 0;
4075
4076                         /*
4077                          * If source address selection fails and we find no
4078                          * route then the ip_output should fail as well with
4079                          * a NO_ROUTE_TO_HOST type error. We probably should
4080                          * catch that somewhere and abort the association
4081                          * right away (assuming this is an INIT being sent).
4082                          */
4083                         if (ro->ro_rt == NULL) {
4084                                 /*
4085                                  * src addr selection failed to find a route
4086                                  * (or valid source addr), so we can't get
4087                                  * there from here (yet)!
4088                                  */
4089                                 sctp_handle_no_route(stcb, net, so_locked);
4090                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4091                                 sctp_m_freem(m);
4092                                 return (EHOSTUNREACH);
4093                         }
4094                         if (ro != &iproute) {
4095                                 memcpy(&iproute, ro, sizeof(*ro));
4096                         }
4097                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4098                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4099                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4100                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4101                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4102                             ro->ro_rt);
4103
4104                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4105                                 /* failed to prepend data, give up */
4106                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4107                                 sctp_m_freem(m);
4108                                 return (ENOMEM);
4109                         }
4110 #ifdef  SCTP_PACKET_LOGGING
4111                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4112                                 sctp_packet_log(m, packet_length);
4113 #endif
4114                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4115                         if (port) {
4116 #if defined(SCTP_WITH_NO_CSUM)
4117                                 SCTP_STAT_INCR(sctps_sendnocrc);
4118 #else
4119                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4120                                 SCTP_STAT_INCR(sctps_sendswcrc);
4121 #endif
4122                                 if (V_udp_cksum) {
4123                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4124                                 }
4125                         } else {
4126 #if defined(SCTP_WITH_NO_CSUM)
4127                                 SCTP_STAT_INCR(sctps_sendnocrc);
4128 #else
4129                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4130                                 m->m_pkthdr.csum_data = 0;
4131                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4132 #endif
4133                         }
4134                         /* send it out.  table id is taken from stcb */
4135 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4136                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4137                                 so = SCTP_INP_SO(inp);
4138                                 SCTP_SOCKET_UNLOCK(so, 0);
4139                         }
4140 #endif
4141                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4142 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4143                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4144                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4145                                 SCTP_TCB_UNLOCK(stcb);
4146                                 SCTP_SOCKET_LOCK(so, 0);
4147                                 SCTP_TCB_LOCK(stcb);
4148                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4149                         }
4150 #endif
4151                         SCTP_STAT_INCR(sctps_sendpackets);
4152                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4153                         if (ret)
4154                                 SCTP_STAT_INCR(sctps_senderrors);
4155
4156                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4157                         if (net == NULL) {
4158                                 /* free tempy routes */
4159                                 if (ro->ro_rt) {
4160                                         RTFREE(ro->ro_rt);
4161                                         ro->ro_rt = NULL;
4162                                 }
4163                         } else {
4164                                 /*
4165                                  * PMTU check versus smallest asoc MTU goes
4166                                  * here
4167                                  */
4168                                 if ((ro->ro_rt != NULL) &&
4169                                     (net->ro._s_addr)) {
4170                                         uint32_t mtu;
4171
4172                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4173                                         if (net->port) {
4174                                                 mtu -= sizeof(struct udphdr);
4175                                         }
4176                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4177                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4178                                                 net->mtu = mtu;
4179                                         }
4180                                 } else if (ro->ro_rt == NULL) {
4181                                         /* route was freed */
4182                                         if (net->ro._s_addr &&
4183                                             net->src_addr_selected) {
4184                                                 sctp_free_ifa(net->ro._s_addr);
4185                                                 net->ro._s_addr = NULL;
4186                                         }
4187                                         net->src_addr_selected = 0;
4188                                 }
4189                         }
4190                         return (ret);
4191                 }
4192 #endif
4193 #ifdef INET6
4194         case AF_INET6:
4195                 {
4196                         uint32_t flowlabel, flowinfo;
4197                         struct ip6_hdr *ip6h;
4198                         struct route_in6 ip6route;
4199                         struct ifnet *ifp;
4200                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4201                         int prev_scope = 0;
4202                         struct sockaddr_in6 lsa6_storage;
4203                         int error;
4204                         u_short prev_port = 0;
4205                         int len;
4206
4207                         if (net) {
4208                                 flowlabel = net->flowlabel;
4209                         } else if (stcb) {
4210                                 flowlabel = stcb->asoc.default_flowlabel;
4211                         } else {
4212                                 flowlabel = inp->sctp_ep.default_flowlabel;
4213                         }
4214                         if (flowlabel == 0) {
4215                                 /*
4216                                  * This means especially, that it is not set
4217                                  * at the SCTP layer. So use the value from
4218                                  * the IP layer.
4219                                  */
4220                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4221                         }
4222                         flowlabel &= 0x000fffff;
4223                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4224                         if (port) {
4225                                 len += sizeof(struct udphdr);
4226                         }
4227                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4228                         if (newm == NULL) {
4229                                 sctp_m_freem(m);
4230                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4231                                 return (ENOMEM);
4232                         }
4233                         SCTP_ALIGN_TO_END(newm, len);
4234                         SCTP_BUF_LEN(newm) = len;
4235                         SCTP_BUF_NEXT(newm) = m;
4236                         m = newm;
4237                         if (net != NULL) {
4238 #ifdef INVARIANTS
4239                                 if (net->flowidset == 0) {
4240                                         panic("Flow ID not set");
4241                                 }
4242 #endif
4243                                 m->m_pkthdr.flowid = net->flowid;
4244                                 m->m_flags |= M_FLOWID;
4245                         } else {
4246                                 if ((init != NULL) && (init->m_flags & M_FLOWID)) {
4247                                         m->m_pkthdr.flowid = init->m_pkthdr.flowid;
4248                                         m->m_flags |= M_FLOWID;
4249                                 }
4250                         }
4251                         packet_length = sctp_calculate_len(m);
4252
4253                         ip6h = mtod(m, struct ip6_hdr *);
4254                         /* protect *sin6 from overwrite */
4255                         sin6 = (struct sockaddr_in6 *)to;
4256                         tmp = *sin6;
4257                         sin6 = &tmp;
4258
4259                         /* KAME hack: embed scopeid */
4260                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4261                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4262                                 return (EINVAL);
4263                         }
4264                         if (net == NULL) {
4265                                 memset(&ip6route, 0, sizeof(ip6route));
4266                                 ro = (sctp_route_t *) & ip6route;
4267                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4268                         } else {
4269                                 ro = (sctp_route_t *) & net->ro;
4270                         }
4271                         /*
4272                          * We assume here that inp_flow is in host byte
4273                          * order within the TCB!
4274                          */
4275                         if (tos_value == 0) {
4276                                 /*
4277                                  * This means especially, that it is not set
4278                                  * at the SCTP layer. So use the value from
4279                                  * the IP layer.
4280                                  */
4281                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4282                         }
4283                         tos_value &= 0xfc;
4284                         if (ecn_ok) {
4285                                 tos_value |= sctp_get_ect(stcb);
4286                         }
4287                         flowinfo = 0x06;
4288                         flowinfo <<= 8;
4289                         flowinfo |= tos_value;
4290                         flowinfo <<= 20;
4291                         flowinfo |= flowlabel;
4292                         ip6h->ip6_flow = htonl(flowinfo);
4293                         if (port) {
4294                                 ip6h->ip6_nxt = IPPROTO_UDP;
4295                         } else {
4296                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4297                         }
4298                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4299                         ip6h->ip6_dst = sin6->sin6_addr;
4300
4301                         /*
4302                          * Add SRC address selection here: we can only reuse
4303                          * to a limited degree the kame src-addr-sel, since
4304                          * we can try their selection but it may not be
4305                          * bound.
4306                          */
4307                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4308                         lsa6_tmp.sin6_family = AF_INET6;
4309                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4310                         lsa6 = &lsa6_tmp;
4311                         if (net && out_of_asoc_ok == 0) {
4312                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4313                                         sctp_free_ifa(net->ro._s_addr);
4314                                         net->ro._s_addr = NULL;
4315                                         net->src_addr_selected = 0;
4316                                         if (ro->ro_rt) {
4317                                                 RTFREE(ro->ro_rt);
4318                                                 ro->ro_rt = NULL;
4319                                         }
4320                                 }
4321                                 if (net->src_addr_selected == 0) {
4322                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4323                                         /* KAME hack: embed scopeid */
4324                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4325                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4326                                                 return (EINVAL);
4327                                         }
4328                                         /* Cache the source address */
4329                                         net->ro._s_addr = sctp_source_address_selection(inp,
4330                                             stcb,
4331                                             ro,
4332                                             net,
4333                                             0,
4334                                             vrf_id);
4335                                         (void)sa6_recoverscope(sin6);
4336                                         net->src_addr_selected = 1;
4337                                 }
4338                                 if (net->ro._s_addr == NULL) {
4339                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4340                                         net->src_addr_selected = 0;
4341                                         sctp_handle_no_route(stcb, net, so_locked);
4342                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4343                                         sctp_m_freem(m);
4344                                         return (EHOSTUNREACH);
4345                                 }
4346                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4347                         } else {
4348                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4349                                 /* KAME hack: embed scopeid */
4350                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4351                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4352                                         return (EINVAL);
4353                                 }
4354                                 if (over_addr == NULL) {
4355                                         struct sctp_ifa *_lsrc;
4356
4357                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4358                                             net,
4359                                             out_of_asoc_ok,
4360                                             vrf_id);
4361                                         if (_lsrc == NULL) {
4362                                                 sctp_handle_no_route(stcb, net, so_locked);
4363                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4364                                                 sctp_m_freem(m);
4365                                                 return (EHOSTUNREACH);
4366                                         }
4367                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4368                                         sctp_free_ifa(_lsrc);
4369                                 } else {
4370                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4371                                         SCTP_RTALLOC(ro, vrf_id);
4372                                 }
4373                                 (void)sa6_recoverscope(sin6);
4374                         }
4375                         lsa6->sin6_port = inp->sctp_lport;
4376
4377                         if (ro->ro_rt == NULL) {
4378                                 /*
4379                                  * src addr selection failed to find a route
4380                                  * (or valid source addr), so we can't get
4381                                  * there from here!
4382                                  */
4383                                 sctp_handle_no_route(stcb, net, so_locked);
4384                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4385                                 sctp_m_freem(m);
4386                                 return (EHOSTUNREACH);
4387                         }
4388                         /*
4389                          * XXX: sa6 may not have a valid sin6_scope_id in
4390                          * the non-SCOPEDROUTING case.
4391                          */
4392                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4393                         lsa6_storage.sin6_family = AF_INET6;
4394                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4395                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4396                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4397                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4398                                 sctp_m_freem(m);
4399                                 return (error);
4400                         }
4401                         /* XXX */
4402                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4403                         lsa6_storage.sin6_port = inp->sctp_lport;
4404                         lsa6 = &lsa6_storage;
4405                         ip6h->ip6_src = lsa6->sin6_addr;
4406
4407                         if (port) {
4408                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4409                                         sctp_handle_no_route(stcb, net, so_locked);
4410                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4411                                         sctp_m_freem(m);
4412                                         return (EHOSTUNREACH);
4413                                 }
4414                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4415                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4416                                 udp->uh_dport = port;
4417                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4418                                 udp->uh_sum = 0;
4419                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4420                         } else {
4421                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4422                         }
4423
4424                         sctphdr->src_port = src_port;
4425                         sctphdr->dest_port = dest_port;
4426                         sctphdr->v_tag = v_tag;
4427                         sctphdr->checksum = 0;
4428
4429                         /*
4430                          * We set the hop limit now since there is a good
4431                          * chance that our ro pointer is now filled
4432                          */
4433                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4434                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4435
4436 #ifdef SCTP_DEBUG
4437                         /* Copy to be sure something bad is not happening */
4438                         sin6->sin6_addr = ip6h->ip6_dst;
4439                         lsa6->sin6_addr = ip6h->ip6_src;
4440 #endif
4441
4442                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4443                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4444                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4445                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4446                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4447                         if (net) {
4448                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4449                                 /*
4450                                  * preserve the port and scope for link
4451                                  * local send
4452                                  */
4453                                 prev_scope = sin6->sin6_scope_id;
4454                                 prev_port = sin6->sin6_port;
4455                         }
4456                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4457                                 /* failed to prepend data, give up */
4458                                 sctp_m_freem(m);
4459                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4460                                 return (ENOMEM);
4461                         }
4462 #ifdef  SCTP_PACKET_LOGGING
4463                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4464                                 sctp_packet_log(m, packet_length);
4465 #endif
4466                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4467                         if (port) {
4468 #if defined(SCTP_WITH_NO_CSUM)
4469                                 SCTP_STAT_INCR(sctps_sendnocrc);
4470 #else
4471                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4472                                 SCTP_STAT_INCR(sctps_sendswcrc);
4473 #endif
4474                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4475                                         udp->uh_sum = 0xffff;
4476                                 }
4477                         } else {
4478 #if defined(SCTP_WITH_NO_CSUM)
4479                                 SCTP_STAT_INCR(sctps_sendnocrc);
4480 #else
4481                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4482                                 m->m_pkthdr.csum_data = 0;
4483                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4484 #endif
4485                         }
4486                         /* send it out. table id is taken from stcb */
4487 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4488                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4489                                 so = SCTP_INP_SO(inp);
4490                                 SCTP_SOCKET_UNLOCK(so, 0);
4491                         }
4492 #endif
4493                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4494 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4495                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4496                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4497                                 SCTP_TCB_UNLOCK(stcb);
4498                                 SCTP_SOCKET_LOCK(so, 0);
4499                                 SCTP_TCB_LOCK(stcb);
4500                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4501                         }
4502 #endif
4503                         if (net) {
4504                                 /* for link local this must be done */
4505                                 sin6->sin6_scope_id = prev_scope;
4506                                 sin6->sin6_port = prev_port;
4507                         }
4508                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4509                         SCTP_STAT_INCR(sctps_sendpackets);
4510                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4511                         if (ret) {
4512                                 SCTP_STAT_INCR(sctps_senderrors);
4513                         }
4514                         if (net == NULL) {
4515                                 /* Now if we had a temp route free it */
4516                                 if (ro->ro_rt) {
4517                                         RTFREE(ro->ro_rt);
4518                                 }
4519                         } else {
4520                                 /*
4521                                  * PMTU check versus smallest asoc MTU goes
4522                                  * here
4523                                  */
4524                                 if (ro->ro_rt == NULL) {
4525                                         /* Route was freed */
4526                                         if (net->ro._s_addr &&
4527                                             net->src_addr_selected) {
4528                                                 sctp_free_ifa(net->ro._s_addr);
4529                                                 net->ro._s_addr = NULL;
4530                                         }
4531                                         net->src_addr_selected = 0;
4532                                 }
4533                                 if ((ro->ro_rt != NULL) &&
4534                                     (net->ro._s_addr)) {
4535                                         uint32_t mtu;
4536
4537                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4538                                         if (mtu &&
4539                                             (stcb->asoc.smallest_mtu > mtu)) {
4540                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4541                                                 net->mtu = mtu;
4542                                                 if (net->port) {
4543                                                         net->mtu -= sizeof(struct udphdr);
4544                                                 }
4545                                         }
4546                                 } else if (ifp) {
4547                                         if (ND_IFINFO(ifp)->linkmtu &&
4548                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4549                                                 sctp_mtu_size_reset(inp,
4550                                                     &stcb->asoc,
4551                                                     ND_IFINFO(ifp)->linkmtu);
4552                                         }
4553                                 }
4554                         }
4555                         return (ret);
4556                 }
4557 #endif
4558         default:
4559                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4560                     ((struct sockaddr *)to)->sa_family);
4561                 sctp_m_freem(m);
4562                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4563                 return (EFAULT);
4564         }
4565 }
4566
4567
4568 void
4569 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4570 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4571     SCTP_UNUSED
4572 #endif
4573 )
4574 {
4575         struct mbuf *m, *m_at, *mp_last;
4576         struct sctp_nets *net;
4577         struct sctp_init_chunk *init;
4578         struct sctp_supported_addr_param *sup_addr;
4579         struct sctp_adaptation_layer_indication *ali;
4580         struct sctp_ecn_supported_param *ecn;
4581         struct sctp_prsctp_supported_param *prsctp;
4582         struct sctp_supported_chunk_types_param *pr_supported;
4583         int cnt_inits_to = 0;
4584         int padval, ret;
4585         int num_ext;
4586         int p_len;
4587
4588         /* INIT's always go to the primary (and usually ONLY address) */
4589         mp_last = NULL;
4590         net = stcb->asoc.primary_destination;
4591         if (net == NULL) {
4592                 net = TAILQ_FIRST(&stcb->asoc.nets);
4593                 if (net == NULL) {
4594                         /* TSNH */
4595                         return;
4596                 }
4597                 /* we confirm any address we send an INIT to */
4598                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4599                 (void)sctp_set_primary_addr(stcb, NULL, net);
4600         } else {
4601                 /* we confirm any address we send an INIT to */
4602                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4603         }
4604         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4605 #ifdef INET6
4606         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4607                 /*
4608                  * special hook, if we are sending to link local it will not
4609                  * show up in our private address count.
4610                  */
4611                 struct sockaddr_in6 *sin6l;
4612
4613                 sin6l = &net->ro._l_addr.sin6;
4614                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4615                         cnt_inits_to = 1;
4616         }
4617 #endif
4618         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4619                 /* This case should not happen */
4620                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4621                 return;
4622         }
4623         /* start the INIT timer */
4624         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4625
4626         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4627         if (m == NULL) {
4628                 /* No memory, INIT timer will re-attempt. */
4629                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4630                 return;
4631         }
4632         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4633         /*
4634          * assume peer supports asconf in order to be able to queue local
4635          * address changes while an INIT is in flight and before the assoc
4636          * is established.
4637          */
4638         stcb->asoc.peer_supports_asconf = 1;
4639         /* Now lets put the SCTP header in place */
4640         init = mtod(m, struct sctp_init_chunk *);
4641         /* now the chunk header */
4642         init->ch.chunk_type = SCTP_INITIATION;
4643         init->ch.chunk_flags = 0;
4644         /* fill in later from mbuf we build */
4645         init->ch.chunk_length = 0;
4646         /* place in my tag */
4647         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4648         /* set up some of the credits. */
4649         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4650             SCTP_MINIMAL_RWND));
4651
4652         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4653         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4654         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4655         /* now the address restriction */
4656         /* XXX Should we take the address family of the socket into account? */
4657         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4658             sizeof(*init));
4659         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4660 #ifdef INET6
4661 #ifdef INET
4662         /* we support 2 types: IPv4/IPv6 */
4663         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4664         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4665         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4666 #else
4667         /* we support 1 type: IPv6 */
4668         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4669         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4670         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4671 #endif
4672 #else
4673         /* we support 1 type: IPv4 */
4674         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4675         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4676         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4677 #endif
4678         SCTP_BUF_LEN(m) += sizeof(struct sctp_supported_addr_param);
4679         /* adaptation layer indication parameter */
4680         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(struct sctp_supported_addr_param));
4681         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4682         ali->ph.param_length = htons(sizeof(*ali));
4683         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4684         SCTP_BUF_LEN(m) += sizeof(*ali);
4685         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4686
4687         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4688                 /* Add NAT friendly parameter */
4689                 struct sctp_paramhdr *ph;
4690
4691                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4692                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4693                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4694                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4695                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4696         }
4697         /* now any cookie time extensions */
4698         if (stcb->asoc.cookie_preserve_req) {
4699                 struct sctp_cookie_perserve_param *cookie_preserve;
4700
4701                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4702                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4703                 cookie_preserve->ph.param_length = htons(
4704                     sizeof(*cookie_preserve));
4705                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4706                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4707                 ecn = (struct sctp_ecn_supported_param *)(
4708                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4709                 stcb->asoc.cookie_preserve_req = 0;
4710         }
4711         /* ECN parameter */
4712         if (stcb->asoc.ecn_allowed == 1) {
4713                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4714                 ecn->ph.param_length = htons(sizeof(*ecn));
4715                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4716                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4717                     sizeof(*ecn));
4718         } else {
4719                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4720         }
4721         /* And now tell the peer we do pr-sctp */
4722         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4723         prsctp->ph.param_length = htons(sizeof(*prsctp));
4724         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4725
4726         /* And now tell the peer we do all the extensions */
4727         pr_supported = (struct sctp_supported_chunk_types_param *)
4728             ((caddr_t)prsctp + sizeof(*prsctp));
4729         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4730         num_ext = 0;
4731         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4732         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4733         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4734         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4735         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4736         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4737                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4738         }
4739         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4740                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4741         }
4742         p_len = sizeof(*pr_supported) + num_ext;
4743         pr_supported->ph.param_length = htons(p_len);
4744         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4745         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4746
4747
4748         /* add authentication parameters */
4749         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4750                 struct sctp_auth_random *randp;
4751                 struct sctp_auth_hmac_algo *hmacs;
4752                 struct sctp_auth_chunk_list *chunks;
4753
4754                 /* attach RANDOM parameter, if available */
4755                 if (stcb->asoc.authinfo.random != NULL) {
4756                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4757                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4758                         /* random key already contains the header */
4759                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4760                         /* zero out any padding required */
4761                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4762                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4763                 }
4764                 /* add HMAC_ALGO parameter */
4765                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4766                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4767                     (uint8_t *) hmacs->hmac_ids);
4768                 if (p_len > 0) {
4769                         p_len += sizeof(*hmacs);
4770                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4771                         hmacs->ph.param_length = htons(p_len);
4772                         /* zero out any padding required */
4773                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4774                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4775                 }
4776                 /* add CHUNKS parameter */
4777                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4778                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4779                     chunks->chunk_types);
4780                 if (p_len > 0) {
4781                         p_len += sizeof(*chunks);
4782                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4783                         chunks->ph.param_length = htons(p_len);
4784                         /* zero out any padding required */
4785                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4786                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4787                 }
4788         }
4789         /* now the addresses */
4790         {
4791                 struct sctp_scoping scp;
4792
4793                 /*
4794                  * To optimize this we could put the scoping stuff into a
4795                  * structure and remove the individual uint8's from the
4796                  * assoc structure. Then we could just sifa in the address
4797                  * within the stcb. But for now this is a quick hack to get
4798                  * the address stuff teased apart.
4799                  */
4800
4801                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4802                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4803                 scp.loopback_scope = stcb->asoc.loopback_scope;
4804                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4805                 scp.local_scope = stcb->asoc.local_scope;
4806                 scp.site_scope = stcb->asoc.site_scope;
4807
4808                 sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to);
4809         }
4810
4811         /* calulate the size and update pkt header and chunk header */
4812         p_len = 0;
4813         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4814                 if (SCTP_BUF_NEXT(m_at) == NULL)
4815                         mp_last = m_at;
4816                 p_len += SCTP_BUF_LEN(m_at);
4817         }
4818         init->ch.chunk_length = htons(p_len);
4819         /*
4820          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4821          * here since the timer will drive a retranmission.
4822          */
4823
4824         /* I don't expect this to execute but we will be safe here */
4825         padval = p_len % 4;
4826         if ((padval) && (mp_last)) {
4827                 /*
4828                  * The compiler worries that mp_last may not be set even
4829                  * though I think it is impossible :-> however we add
4830                  * mp_last here just in case.
4831                  */
4832                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4833                 if (ret) {
4834                         /* Houston we have a problem, no space */
4835                         sctp_m_freem(m);
4836                         return;
4837                 }
4838         }
4839         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4840         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4841             (struct sockaddr *)&net->ro._l_addr,
4842             m, 0, NULL, 0, 0, 0, 0,
4843             inp->sctp_lport, stcb->rport, htonl(0),
4844             net->port, so_locked, NULL, NULL);
4845         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4846         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4847         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4848 }
4849
4850 struct mbuf *
4851 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4852     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4853 {
4854         /*
4855          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4856          * being equal to the beginning of the params i.e. (iphlen +
4857          * sizeof(struct sctp_init_msg) parse through the parameters to the
4858          * end of the mbuf verifying that all parameters are known.
4859          *
4860          * For unknown parameters build and return a mbuf with
4861          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4862          * processing this chunk stop, and set *abort_processing to 1.
4863          *
4864          * By having param_offset be pre-set to where parameters begin it is
4865          * hoped that this routine may be reused in the future by new
4866          * features.
4867          */
4868         struct sctp_paramhdr *phdr, params;
4869
4870         struct mbuf *mat, *op_err;
4871         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4872         int at, limit, pad_needed;
4873         uint16_t ptype, plen, padded_size;
4874         int err_at;
4875
4876         *abort_processing = 0;
4877         mat = in_initpkt;
4878         err_at = 0;
4879         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4880         at = param_offset;
4881         op_err = NULL;
4882         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4883         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4884         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4885                 ptype = ntohs(phdr->param_type);
4886                 plen = ntohs(phdr->param_length);
4887                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4888                         /* wacked parameter */
4889                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4890                         goto invalid_size;
4891                 }
4892                 limit -= SCTP_SIZE32(plen);
4893                 /*-
4894                  * All parameters for all chunks that we know/understand are
4895                  * listed here. We process them other places and make
4896                  * appropriate stop actions per the upper bits. However this
4897                  * is the generic routine processor's can call to get back
4898                  * an operr.. to either incorporate (init-ack) or send.
4899                  */
4900                 padded_size = SCTP_SIZE32(plen);
4901                 switch (ptype) {
4902                         /* Param's with variable size */
4903                 case SCTP_HEARTBEAT_INFO:
4904                 case SCTP_STATE_COOKIE:
4905                 case SCTP_UNRECOG_PARAM:
4906                 case SCTP_ERROR_CAUSE_IND:
4907                         /* ok skip fwd */
4908                         at += padded_size;
4909                         break;
4910                         /* Param's with variable size within a range */
4911                 case SCTP_CHUNK_LIST:
4912                 case SCTP_SUPPORTED_CHUNK_EXT:
4913                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4914                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4915                                 goto invalid_size;
4916                         }
4917                         at += padded_size;
4918                         break;
4919                 case SCTP_SUPPORTED_ADDRTYPE:
4920                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4921                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4922                                 goto invalid_size;
4923                         }
4924                         at += padded_size;
4925                         break;
4926                 case SCTP_RANDOM:
4927                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4928                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4929                                 goto invalid_size;
4930                         }
4931                         at += padded_size;
4932                         break;
4933                 case SCTP_SET_PRIM_ADDR:
4934                 case SCTP_DEL_IP_ADDRESS:
4935                 case SCTP_ADD_IP_ADDRESS:
4936                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4937                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4938                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4939                                 goto invalid_size;
4940                         }
4941                         at += padded_size;
4942                         break;
4943                         /* Param's with a fixed size */
4944                 case SCTP_IPV4_ADDRESS:
4945                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4946                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4947                                 goto invalid_size;
4948                         }
4949                         at += padded_size;
4950                         break;
4951                 case SCTP_IPV6_ADDRESS:
4952                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4953                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4954                                 goto invalid_size;
4955                         }
4956                         at += padded_size;
4957                         break;
4958                 case SCTP_COOKIE_PRESERVE:
4959                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4960                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4961                                 goto invalid_size;
4962                         }
4963                         at += padded_size;
4964                         break;
4965                 case SCTP_HAS_NAT_SUPPORT:
4966                         *nat_friendly = 1;
4967                         /* fall through */
4968                 case SCTP_PRSCTP_SUPPORTED:
4969
4970                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4971                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4972                                 goto invalid_size;
4973                         }
4974                         at += padded_size;
4975                         break;
4976                 case SCTP_ECN_CAPABLE:
4977                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4978                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4979                                 goto invalid_size;
4980                         }
4981                         at += padded_size;
4982                         break;
4983                 case SCTP_ULP_ADAPTATION:
4984                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4985                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4986                                 goto invalid_size;
4987                         }
4988                         at += padded_size;
4989                         break;
4990                 case SCTP_SUCCESS_REPORT:
4991                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4992                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4993                                 goto invalid_size;
4994                         }
4995                         at += padded_size;
4996                         break;
4997                 case SCTP_HOSTNAME_ADDRESS:
4998                         {
4999                                 /* We can NOT handle HOST NAME addresses!! */
5000                                 int l_len;
5001
5002                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5003                                 *abort_processing = 1;
5004                                 if (op_err == NULL) {
5005                                         /* Ok need to try to get a mbuf */
5006 #ifdef INET6
5007                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5008 #else
5009                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5010 #endif
5011                                         l_len += plen;
5012                                         l_len += sizeof(struct sctp_paramhdr);
5013                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5014                                         if (op_err) {
5015                                                 SCTP_BUF_LEN(op_err) = 0;
5016                                                 /*
5017                                                  * pre-reserve space for ip
5018                                                  * and sctp header  and
5019                                                  * chunk hdr
5020                                                  */
5021 #ifdef INET6
5022                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5023 #else
5024                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5025 #endif
5026                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5027                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5028                                         }
5029                                 }
5030                                 if (op_err) {
5031                                         /* If we have space */
5032                                         struct sctp_paramhdr s;
5033
5034                                         if (err_at % 4) {
5035                                                 uint32_t cpthis = 0;
5036
5037                                                 pad_needed = 4 - (err_at % 4);
5038                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5039                                                 err_at += pad_needed;
5040                                         }
5041                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5042                                         s.param_length = htons(sizeof(s) + plen);
5043                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5044                                         err_at += sizeof(s);
5045                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5046                                         if (phdr == NULL) {
5047                                                 sctp_m_freem(op_err);
5048                                                 /*
5049                                                  * we are out of memory but
5050                                                  * we still need to have a
5051                                                  * look at what to do (the
5052                                                  * system is in trouble
5053                                                  * though).
5054                                                  */
5055                                                 return (NULL);
5056                                         }
5057                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5058                                 }
5059                                 return (op_err);
5060                                 break;
5061                         }
5062                 default:
5063                         /*
5064                          * we do not recognize the parameter figure out what
5065                          * we do.
5066                          */
5067                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5068                         if ((ptype & 0x4000) == 0x4000) {
5069                                 /* Report bit is set?? */
5070                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5071                                 if (op_err == NULL) {
5072                                         int l_len;
5073
5074                                         /* Ok need to try to get an mbuf */
5075 #ifdef INET6
5076                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5077 #else
5078                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5079 #endif
5080                                         l_len += plen;
5081                                         l_len += sizeof(struct sctp_paramhdr);
5082                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5083                                         if (op_err) {
5084                                                 SCTP_BUF_LEN(op_err) = 0;
5085 #ifdef INET6
5086                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5087 #else
5088                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5089 #endif
5090                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5091                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5092                                         }
5093                                 }
5094                                 if (op_err) {
5095                                         /* If we have space */
5096                                         struct sctp_paramhdr s;
5097
5098                                         if (err_at % 4) {
5099                                                 uint32_t cpthis = 0;
5100
5101                                                 pad_needed = 4 - (err_at % 4);
5102                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5103                                                 err_at += pad_needed;
5104                                         }
5105                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5106                                         s.param_length = htons(sizeof(s) + plen);
5107                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5108                                         err_at += sizeof(s);
5109                                         if (plen > sizeof(tempbuf)) {
5110                                                 plen = sizeof(tempbuf);
5111                                         }
5112                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5113                                         if (phdr == NULL) {
5114                                                 sctp_m_freem(op_err);
5115                                                 /*
5116                                                  * we are out of memory but
5117                                                  * we still need to have a
5118                                                  * look at what to do (the
5119                                                  * system is in trouble
5120                                                  * though).
5121                                                  */
5122                                                 op_err = NULL;
5123                                                 goto more_processing;
5124                                         }
5125                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5126                                         err_at += plen;
5127                                 }
5128                         }
5129         more_processing:
5130                         if ((ptype & 0x8000) == 0x0000) {
5131                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5132                                 return (op_err);
5133                         } else {
5134                                 /* skip this chunk and continue processing */
5135                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5136                                 at += SCTP_SIZE32(plen);
5137                         }
5138                         break;
5139
5140                 }
5141                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5142         }
5143         return (op_err);
5144 invalid_size:
5145         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5146         *abort_processing = 1;
5147         if ((op_err == NULL) && phdr) {
5148                 int l_len;
5149
5150 #ifdef INET6
5151                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5152 #else
5153                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5154 #endif
5155                 l_len += (2 * sizeof(struct sctp_paramhdr));
5156                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5157                 if (op_err) {
5158                         SCTP_BUF_LEN(op_err) = 0;
5159 #ifdef INET6
5160                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5161 #else
5162                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5163 #endif
5164                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5165                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5166                 }
5167         }
5168         if ((op_err) && phdr) {
5169                 struct sctp_paramhdr s;
5170
5171                 if (err_at % 4) {
5172                         uint32_t cpthis = 0;
5173
5174                         pad_needed = 4 - (err_at % 4);
5175                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5176                         err_at += pad_needed;
5177                 }
5178                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5179                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5180                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5181                 err_at += sizeof(s);
5182                 /* Only copy back the p-hdr that caused the issue */
5183                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5184         }
5185         return (op_err);
5186 }
5187
5188 static int
5189 sctp_are_there_new_addresses(struct sctp_association *asoc,
5190     struct mbuf *in_initpkt, int offset)
5191 {
5192         /*
5193          * Given a INIT packet, look through the packet to verify that there
5194          * are NO new addresses. As we go through the parameters add reports
5195          * of any un-understood parameters that require an error.  Also we
5196          * must return (1) to drop the packet if we see a un-understood
5197          * parameter that tells us to drop the chunk.
5198          */
5199         struct sockaddr *sa_touse;
5200         struct sockaddr *sa;
5201         struct sctp_paramhdr *phdr, params;
5202         uint16_t ptype, plen;
5203         uint8_t fnd;
5204         struct sctp_nets *net;
5205         struct ip *iph;
5206
5207 #ifdef INET
5208         struct sockaddr_in sin4, *sa4;
5209
5210 #endif
5211 #ifdef INET6
5212         struct sockaddr_in6 sin6, *sa6;
5213         struct ip6_hdr *ip6h;
5214
5215 #endif
5216
5217 #ifdef INET
5218         memset(&sin4, 0, sizeof(sin4));
5219         sin4.sin_family = AF_INET;
5220         sin4.sin_len = sizeof(sin4);
5221 #endif
5222 #ifdef INET6
5223         memset(&sin6, 0, sizeof(sin6));
5224         sin6.sin6_family = AF_INET6;
5225         sin6.sin6_len = sizeof(sin6);
5226 #endif
5227         sa_touse = NULL;
5228         /* First what about the src address of the pkt ? */
5229         iph = mtod(in_initpkt, struct ip *);
5230         switch (iph->ip_v) {
5231 #ifdef INET
5232         case IPVERSION:
5233                 /* source addr is IPv4 */
5234                 sin4.sin_addr = iph->ip_src;
5235                 sa_touse = (struct sockaddr *)&sin4;
5236                 break;
5237 #endif
5238 #ifdef INET6
5239         case IPV6_VERSION >> 4:
5240                 /* source addr is IPv6 */
5241                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
5242                 sin6.sin6_addr = ip6h->ip6_src;
5243                 sa_touse = (struct sockaddr *)&sin6;
5244                 break;
5245 #endif
5246         default:
5247                 return (1);
5248         }
5249
5250         fnd = 0;
5251         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5252                 sa = (struct sockaddr *)&net->ro._l_addr;
5253                 if (sa->sa_family == sa_touse->sa_family) {
5254 #ifdef INET
5255                         if (sa->sa_family == AF_INET) {
5256                                 sa4 = (struct sockaddr_in *)sa;
5257                                 if (sa4->sin_addr.s_addr == sin4.sin_addr.s_addr) {
5258                                         fnd = 1;
5259                                         break;
5260                                 }
5261                         }
5262 #endif
5263 #ifdef INET6
5264                         if (sa->sa_family == AF_INET6) {
5265                                 sa6 = (struct sockaddr_in6 *)sa;
5266                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, &sin6)) {
5267                                         fnd = 1;
5268                                         break;
5269                                 }
5270                         }
5271 #endif
5272                 }
5273         }
5274         if (fnd == 0) {
5275                 /* New address added! no need to look futher. */
5276                 return (1);
5277         }
5278         /* Ok so far lets munge through the rest of the packet */
5279         offset += sizeof(struct sctp_init_chunk);
5280         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5281         while (phdr) {
5282                 sa_touse = NULL;
5283                 ptype = ntohs(phdr->param_type);
5284                 plen = ntohs(phdr->param_length);
5285                 switch (ptype) {
5286 #ifdef INET
5287                 case SCTP_IPV4_ADDRESS:
5288                         {
5289                                 struct sctp_ipv4addr_param *p4, p4_buf;
5290
5291                                 phdr = sctp_get_next_param(in_initpkt, offset,
5292                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5293                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5294                                     phdr == NULL) {
5295                                         return (1);
5296                                 }
5297                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5298                                 sin4.sin_addr.s_addr = p4->addr;
5299                                 sa_touse = (struct sockaddr *)&sin4;
5300                                 break;
5301                         }
5302 #endif
5303 #ifdef INET6
5304                 case SCTP_IPV6_ADDRESS:
5305                         {
5306                                 struct sctp_ipv6addr_param *p6, p6_buf;
5307
5308                                 phdr = sctp_get_next_param(in_initpkt, offset,
5309                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5310                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5311                                     phdr == NULL) {
5312                                         return (1);
5313                                 }
5314                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5315                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5316                                     sizeof(p6->addr));
5317                                 sa_touse = (struct sockaddr *)&sin6;
5318                                 break;
5319                         }
5320 #endif
5321                 default:
5322                         sa_touse = NULL;
5323                         break;
5324                 }
5325                 if (sa_touse) {
5326                         /* ok, sa_touse points to one to check */
5327                         fnd = 0;
5328                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5329                                 sa = (struct sockaddr *)&net->ro._l_addr;
5330                                 if (sa->sa_family != sa_touse->sa_family) {
5331                                         continue;
5332                                 }
5333 #ifdef INET
5334                                 if (sa->sa_family == AF_INET) {
5335                                         sa4 = (struct sockaddr_in *)sa;
5336                                         if (sa4->sin_addr.s_addr ==
5337                                             sin4.sin_addr.s_addr) {
5338                                                 fnd = 1;
5339                                                 break;
5340                                         }
5341                                 }
5342 #endif
5343 #ifdef INET6
5344                                 if (sa->sa_family == AF_INET6) {
5345                                         sa6 = (struct sockaddr_in6 *)sa;
5346                                         if (SCTP6_ARE_ADDR_EQUAL(
5347                                             sa6, &sin6)) {
5348                                                 fnd = 1;
5349                                                 break;
5350                                         }
5351                                 }
5352 #endif
5353                         }
5354                         if (!fnd) {
5355                                 /* New addr added! no need to look further */
5356                                 return (1);
5357                         }
5358                 }
5359                 offset += SCTP_SIZE32(plen);
5360                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5361         }
5362         return (0);
5363 }
5364
5365 /*
5366  * Given a MBUF chain that was sent into us containing an INIT. Build a
5367  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5368  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5369  * message (i.e. the struct sctp_init_msg).
5370  */
5371 void
5372 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5373     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
5374     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5375 {
5376         struct sctp_association *asoc;
5377         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5378         struct sctp_init_ack_chunk *initack;
5379         struct sctp_adaptation_layer_indication *ali;
5380         struct sctp_ecn_supported_param *ecn;
5381         struct sctp_prsctp_supported_param *prsctp;
5382         struct sctp_supported_chunk_types_param *pr_supported;
5383         union sctp_sockstore store, store1, *over_addr;
5384
5385 #ifdef INET
5386         struct sockaddr_in *sin, *to_sin;
5387
5388 #endif
5389 #ifdef INET6
5390         struct sockaddr_in6 *sin6, *to_sin6;
5391
5392 #endif
5393         struct ip *iph;
5394
5395 #ifdef INET6
5396         struct ip6_hdr *ip6;
5397
5398 #endif
5399         struct sockaddr *to;
5400         struct sctp_state_cookie stc;
5401         struct sctp_nets *net = NULL;
5402         uint8_t *signature = NULL;
5403         int cnt_inits_to = 0;
5404         uint16_t his_limit, i_want;
5405         int abort_flag, padval;
5406         int num_ext;
5407         int p_len;
5408         int nat_friendly = 0;
5409         struct socket *so;
5410
5411         if (stcb)
5412                 asoc = &stcb->asoc;
5413         else
5414                 asoc = NULL;
5415         mp_last = NULL;
5416         if ((asoc != NULL) &&
5417             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5418             (sctp_are_there_new_addresses(asoc, init_pkt, offset))) {
5419                 /* new addresses, out of here in non-cookie-wait states */
5420                 /*
5421                  * Send a ABORT, we don't add the new address error clause
5422                  * though we even set the T bit and copy in the 0 tag.. this
5423                  * looks no different than if no listener was present.
5424                  */
5425                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
5426                 return;
5427         }
5428         abort_flag = 0;
5429         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5430             (offset + sizeof(struct sctp_init_chunk)),
5431             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5432         if (abort_flag) {
5433 do_a_abort:
5434                 sctp_send_abort(init_pkt, iphlen, sh,
5435                     init_chk->init.initiate_tag, op_err, vrf_id, port);
5436                 return;
5437         }
5438         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5439         if (m == NULL) {
5440                 /* No memory, INIT timer will re-attempt. */
5441                 if (op_err)
5442                         sctp_m_freem(op_err);
5443                 return;
5444         }
5445         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5446
5447         /* the time I built cookie */
5448         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5449
5450         /* populate any tie tags */
5451         if (asoc != NULL) {
5452                 /* unlock before tag selections */
5453                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5454                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5455                 stc.cookie_life = asoc->cookie_life;
5456                 net = asoc->primary_destination;
5457         } else {
5458                 stc.tie_tag_my_vtag = 0;
5459                 stc.tie_tag_peer_vtag = 0;
5460                 /* life I will award this cookie */
5461                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5462         }
5463
5464         /* copy in the ports for later check */
5465         stc.myport = sh->dest_port;
5466         stc.peerport = sh->src_port;
5467
5468         /*
5469          * If we wanted to honor cookie life extentions, we would add to
5470          * stc.cookie_life. For now we should NOT honor any extension
5471          */
5472         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5473         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5474                 struct inpcb *in_inp;
5475
5476                 /* Its a V6 socket */
5477                 in_inp = (struct inpcb *)inp;
5478                 stc.ipv6_addr_legal = 1;
5479                 /* Now look at the binding flag to see if V4 will be legal */
5480                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5481                         stc.ipv4_addr_legal = 1;
5482                 } else {
5483                         /* V4 addresses are NOT legal on the association */
5484                         stc.ipv4_addr_legal = 0;
5485                 }
5486         } else {
5487                 /* Its a V4 socket, no - V6 */
5488                 stc.ipv4_addr_legal = 1;
5489                 stc.ipv6_addr_legal = 0;
5490         }
5491
5492 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5493         stc.ipv4_scope = 1;
5494 #else
5495         stc.ipv4_scope = 0;
5496 #endif
5497         /* now for scope setup */
5498         memset((caddr_t)&store, 0, sizeof(store));
5499         memset((caddr_t)&store1, 0, sizeof(store1));
5500 #ifdef INET
5501         sin = &store.sin;
5502         to_sin = &store1.sin;
5503 #endif
5504 #ifdef INET6
5505         sin6 = &store.sin6;
5506         to_sin6 = &store1.sin6;
5507 #endif
5508         iph = mtod(init_pkt, struct ip *);
5509         /* establish the to_addr's */
5510         switch (iph->ip_v) {
5511 #ifdef INET
5512         case IPVERSION:
5513                 to_sin->sin_port = sh->dest_port;
5514                 to_sin->sin_family = AF_INET;
5515                 to_sin->sin_len = sizeof(struct sockaddr_in);
5516                 to_sin->sin_addr = iph->ip_dst;
5517                 break;
5518 #endif
5519 #ifdef INET6
5520         case IPV6_VERSION >> 4:
5521                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5522                 to_sin6->sin6_addr = ip6->ip6_dst;
5523                 to_sin6->sin6_scope_id = 0;
5524                 to_sin6->sin6_port = sh->dest_port;
5525                 to_sin6->sin6_family = AF_INET6;
5526                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5527                 break;
5528 #endif
5529         default:
5530                 goto do_a_abort;
5531                 break;
5532         }
5533
5534         if (net == NULL) {
5535                 to = (struct sockaddr *)&store;
5536                 switch (iph->ip_v) {
5537 #ifdef INET
5538                 case IPVERSION:
5539                         {
5540                                 sin->sin_family = AF_INET;
5541                                 sin->sin_len = sizeof(struct sockaddr_in);
5542                                 sin->sin_port = sh->src_port;
5543                                 sin->sin_addr = iph->ip_src;
5544                                 /* lookup address */
5545                                 stc.address[0] = sin->sin_addr.s_addr;
5546                                 stc.address[1] = 0;
5547                                 stc.address[2] = 0;
5548                                 stc.address[3] = 0;
5549                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5550                                 /* local from address */
5551                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5552                                 stc.laddress[1] = 0;
5553                                 stc.laddress[2] = 0;
5554                                 stc.laddress[3] = 0;
5555                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5556                                 /* scope_id is only for v6 */
5557                                 stc.scope_id = 0;
5558 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5559                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5560                                         stc.ipv4_scope = 1;
5561                                 }
5562 #else
5563                                 stc.ipv4_scope = 1;
5564 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5565                                 /* Must use the address in this case */
5566                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5567                                         stc.loopback_scope = 1;
5568                                         stc.ipv4_scope = 1;
5569                                         stc.site_scope = 1;
5570                                         stc.local_scope = 0;
5571                                 }
5572                                 break;
5573                         }
5574 #endif
5575 #ifdef INET6
5576                 case IPV6_VERSION >> 4:
5577                         {
5578                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5579                                 sin6->sin6_family = AF_INET6;
5580                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5581                                 sin6->sin6_port = sh->src_port;
5582                                 sin6->sin6_addr = ip6->ip6_src;
5583                                 /* lookup address */
5584                                 memcpy(&stc.address, &sin6->sin6_addr,
5585                                     sizeof(struct in6_addr));
5586                                 sin6->sin6_scope_id = 0;
5587                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5588                                 stc.scope_id = 0;
5589                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5590                                         /*
5591                                          * FIX ME: does this have scope from
5592                                          * rcvif?
5593                                          */
5594                                         (void)sa6_recoverscope(sin6);
5595                                         stc.scope_id = sin6->sin6_scope_id;
5596                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5597                                         stc.loopback_scope = 1;
5598                                         stc.local_scope = 0;
5599                                         stc.site_scope = 1;
5600                                         stc.ipv4_scope = 1;
5601                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5602                                         /*
5603                                          * If the new destination is a
5604                                          * LINK_LOCAL we must have common
5605                                          * both site and local scope. Don't
5606                                          * set local scope though since we
5607                                          * must depend on the source to be
5608                                          * added implicitly. We cannot
5609                                          * assure just because we share one
5610                                          * link that all links are common.
5611                                          */
5612                                         stc.local_scope = 0;
5613                                         stc.site_scope = 1;
5614                                         stc.ipv4_scope = 1;
5615                                         /*
5616                                          * we start counting for the private
5617                                          * address stuff at 1. since the
5618                                          * link local we source from won't
5619                                          * show up in our scoped count.
5620                                          */
5621                                         cnt_inits_to = 1;
5622                                         /*
5623                                          * pull out the scope_id from
5624                                          * incoming pkt
5625                                          */
5626                                         /*
5627                                          * FIX ME: does this have scope from
5628                                          * rcvif?
5629                                          */
5630                                         (void)sa6_recoverscope(sin6);
5631                                         stc.scope_id = sin6->sin6_scope_id;
5632                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5633                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5634                                         /*
5635                                          * If the new destination is
5636                                          * SITE_LOCAL then we must have site
5637                                          * scope in common.
5638                                          */
5639                                         stc.site_scope = 1;
5640                                 }
5641                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5642                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5643                                 break;
5644                         }
5645 #endif
5646                 default:
5647                         /* TSNH */
5648                         goto do_a_abort;
5649                         break;
5650                 }
5651         } else {
5652                 /* set the scope per the existing tcb */
5653
5654 #ifdef INET6
5655                 struct sctp_nets *lnet;
5656
5657 #endif
5658
5659                 stc.loopback_scope = asoc->loopback_scope;
5660                 stc.ipv4_scope = asoc->ipv4_local_scope;
5661                 stc.site_scope = asoc->site_scope;
5662                 stc.local_scope = asoc->local_scope;
5663 #ifdef INET6
5664                 /* Why do we not consider IPv4 LL addresses? */
5665                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5666                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5667                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5668                                         /*
5669                                          * if we have a LL address, start
5670                                          * counting at 1.
5671                                          */
5672                                         cnt_inits_to = 1;
5673                                 }
5674                         }
5675                 }
5676 #endif
5677                 /* use the net pointer */
5678                 to = (struct sockaddr *)&net->ro._l_addr;
5679                 switch (to->sa_family) {
5680 #ifdef INET
5681                 case AF_INET:
5682                         sin = (struct sockaddr_in *)to;
5683                         stc.address[0] = sin->sin_addr.s_addr;
5684                         stc.address[1] = 0;
5685                         stc.address[2] = 0;
5686                         stc.address[3] = 0;
5687                         stc.addr_type = SCTP_IPV4_ADDRESS;
5688                         if (net->src_addr_selected == 0) {
5689                                 /*
5690                                  * strange case here, the INIT should have
5691                                  * did the selection.
5692                                  */
5693                                 net->ro._s_addr = sctp_source_address_selection(inp,
5694                                     stcb, (sctp_route_t *) & net->ro,
5695                                     net, 0, vrf_id);
5696                                 if (net->ro._s_addr == NULL)
5697                                         return;
5698
5699                                 net->src_addr_selected = 1;
5700
5701                         }
5702                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5703                         stc.laddress[1] = 0;
5704                         stc.laddress[2] = 0;
5705                         stc.laddress[3] = 0;
5706                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5707                         /* scope_id is only for v6 */
5708                         stc.scope_id = 0;
5709                         break;
5710 #endif
5711 #ifdef INET6
5712                 case AF_INET6:
5713                         sin6 = (struct sockaddr_in6 *)to;
5714                         memcpy(&stc.address, &sin6->sin6_addr,
5715                             sizeof(struct in6_addr));
5716                         stc.addr_type = SCTP_IPV6_ADDRESS;
5717                         stc.scope_id = sin6->sin6_scope_id;
5718                         if (net->src_addr_selected == 0) {
5719                                 /*
5720                                  * strange case here, the INIT should have
5721                                  * did the selection.
5722                                  */
5723                                 net->ro._s_addr = sctp_source_address_selection(inp,
5724                                     stcb, (sctp_route_t *) & net->ro,
5725                                     net, 0, vrf_id);
5726                                 if (net->ro._s_addr == NULL)
5727                                         return;
5728
5729                                 net->src_addr_selected = 1;
5730                         }
5731                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5732                             sizeof(struct in6_addr));
5733                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5734                         break;
5735 #endif
5736                 }
5737         }
5738         /* Now lets put the SCTP header in place */
5739         initack = mtod(m, struct sctp_init_ack_chunk *);
5740         /* Save it off for quick ref */
5741         stc.peers_vtag = init_chk->init.initiate_tag;
5742         /* who are we */
5743         memcpy(stc.identification, SCTP_VERSION_STRING,
5744             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5745         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5746         /* now the chunk header */
5747         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5748         initack->ch.chunk_flags = 0;
5749         /* fill in later from mbuf we build */
5750         initack->ch.chunk_length = 0;
5751         /* place in my tag */
5752         if ((asoc != NULL) &&
5753             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5754             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5755             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5756                 /* re-use the v-tags and init-seq here */
5757                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5758                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5759         } else {
5760                 uint32_t vtag, itsn;
5761
5762                 if (hold_inp_lock) {
5763                         SCTP_INP_INCR_REF(inp);
5764                         SCTP_INP_RUNLOCK(inp);
5765                 }
5766                 if (asoc) {
5767                         atomic_add_int(&asoc->refcnt, 1);
5768                         SCTP_TCB_UNLOCK(stcb);
5769         new_tag:
5770                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5771                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5772                                 /*
5773                                  * Got a duplicate vtag on some guy behind a
5774                                  * nat make sure we don't use it.
5775                                  */
5776                                 goto new_tag;
5777                         }
5778                         initack->init.initiate_tag = htonl(vtag);
5779                         /* get a TSN to use too */
5780                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5781                         initack->init.initial_tsn = htonl(itsn);
5782                         SCTP_TCB_LOCK(stcb);
5783                         atomic_add_int(&asoc->refcnt, -1);
5784                 } else {
5785                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5786                         initack->init.initiate_tag = htonl(vtag);
5787                         /* get a TSN to use too */
5788                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5789                 }
5790                 if (hold_inp_lock) {
5791                         SCTP_INP_RLOCK(inp);
5792                         SCTP_INP_DECR_REF(inp);
5793                 }
5794         }
5795         /* save away my tag to */
5796         stc.my_vtag = initack->init.initiate_tag;
5797
5798         /* set up some of the credits. */
5799         so = inp->sctp_socket;
5800         if (so == NULL) {
5801                 /* memory problem */
5802                 sctp_m_freem(m);
5803                 return;
5804         } else {
5805                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5806         }
5807         /* set what I want */
5808         his_limit = ntohs(init_chk->init.num_inbound_streams);
5809         /* choose what I want */
5810         if (asoc != NULL) {
5811                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5812                         i_want = asoc->streamoutcnt;
5813                 } else {
5814                         i_want = inp->sctp_ep.pre_open_stream_count;
5815                 }
5816         } else {
5817                 i_want = inp->sctp_ep.pre_open_stream_count;
5818         }
5819         if (his_limit < i_want) {
5820                 /* I Want more :< */
5821                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5822         } else {
5823                 /* I can have what I want :> */
5824                 initack->init.num_outbound_streams = htons(i_want);
5825         }
5826         /* tell him his limt. */
5827         initack->init.num_inbound_streams =
5828             htons(inp->sctp_ep.max_open_streams_intome);
5829
5830         /* adaptation layer indication parameter */
5831         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5832         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5833         ali->ph.param_length = htons(sizeof(*ali));
5834         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5835         SCTP_BUF_LEN(m) += sizeof(*ali);
5836         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5837
5838         /* ECN parameter */
5839         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5840             (inp->sctp_ecn_enable == 1)) {
5841                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5842                 ecn->ph.param_length = htons(sizeof(*ecn));
5843                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5844
5845                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5846                     sizeof(*ecn));
5847         } else {
5848                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5849         }
5850         /* And now tell the peer we do  pr-sctp */
5851         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5852         prsctp->ph.param_length = htons(sizeof(*prsctp));
5853         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5854         if (nat_friendly) {
5855                 /* Add NAT friendly parameter */
5856                 struct sctp_paramhdr *ph;
5857
5858                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5859                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5860                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5861                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5862         }
5863         /* And now tell the peer we do all the extensions */
5864         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5865         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5866         num_ext = 0;
5867         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5868         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5869         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5870         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5871         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5872         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5873                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5874         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5875                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5876         p_len = sizeof(*pr_supported) + num_ext;
5877         pr_supported->ph.param_length = htons(p_len);
5878         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5879         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5880
5881         /* add authentication parameters */
5882         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5883                 struct sctp_auth_random *randp;
5884                 struct sctp_auth_hmac_algo *hmacs;
5885                 struct sctp_auth_chunk_list *chunks;
5886                 uint16_t random_len;
5887
5888                 /* generate and add RANDOM parameter */
5889                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5890                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5891                 randp->ph.param_type = htons(SCTP_RANDOM);
5892                 p_len = sizeof(*randp) + random_len;
5893                 randp->ph.param_length = htons(p_len);
5894                 SCTP_READ_RANDOM(randp->random_data, random_len);
5895                 /* zero out any padding required */
5896                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5897                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5898
5899                 /* add HMAC_ALGO parameter */
5900                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5901                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5902                     (uint8_t *) hmacs->hmac_ids);
5903                 if (p_len > 0) {
5904                         p_len += sizeof(*hmacs);
5905                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5906                         hmacs->ph.param_length = htons(p_len);
5907                         /* zero out any padding required */
5908                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5909                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5910                 }
5911                 /* add CHUNKS parameter */
5912                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5913                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5914                     chunks->chunk_types);
5915                 if (p_len > 0) {
5916                         p_len += sizeof(*chunks);
5917                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5918                         chunks->ph.param_length = htons(p_len);
5919                         /* zero out any padding required */
5920                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5921                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5922                 }
5923         }
5924         m_at = m;
5925         /* now the addresses */
5926         {
5927                 struct sctp_scoping scp;
5928
5929                 /*
5930                  * To optimize this we could put the scoping stuff into a
5931                  * structure and remove the individual uint8's from the stc
5932                  * structure. Then we could just sifa in the address within
5933                  * the stc.. but for now this is a quick hack to get the
5934                  * address stuff teased apart.
5935                  */
5936                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5937                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5938                 scp.loopback_scope = stc.loopback_scope;
5939                 scp.ipv4_local_scope = stc.ipv4_scope;
5940                 scp.local_scope = stc.local_scope;
5941                 scp.site_scope = stc.site_scope;
5942                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5943         }
5944
5945         /* tack on the operational error if present */
5946         if (op_err) {
5947                 struct mbuf *ol;
5948                 int llen;
5949
5950                 llen = 0;
5951                 ol = op_err;
5952
5953                 while (ol) {
5954                         llen += SCTP_BUF_LEN(ol);
5955                         ol = SCTP_BUF_NEXT(ol);
5956                 }
5957                 if (llen % 4) {
5958                         /* must add a pad to the param */
5959                         uint32_t cpthis = 0;
5960                         int padlen;
5961
5962                         padlen = 4 - (llen % 4);
5963                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5964                 }
5965                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5966                         m_at = SCTP_BUF_NEXT(m_at);
5967                 }
5968                 SCTP_BUF_NEXT(m_at) = op_err;
5969                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5970                         m_at = SCTP_BUF_NEXT(m_at);
5971                 }
5972         }
5973         /* pre-calulate the size and update pkt header and chunk header */
5974         p_len = 0;
5975         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5976                 p_len += SCTP_BUF_LEN(m_tmp);
5977                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5978                         /* m_tmp should now point to last one */
5979                         break;
5980                 }
5981         }
5982
5983         /* Now we must build a cookie */
5984         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5985         if (m_cookie == NULL) {
5986                 /* memory problem */
5987                 sctp_m_freem(m);
5988                 return;
5989         }
5990         /* Now append the cookie to the end and update the space/size */
5991         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5992
5993         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5994                 p_len += SCTP_BUF_LEN(m_tmp);
5995                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5996                         /* m_tmp should now point to last one */
5997                         mp_last = m_tmp;
5998                         break;
5999                 }
6000         }
6001         /*
6002          * Place in the size, but we don't include the last pad (if any) in
6003          * the INIT-ACK.
6004          */
6005         initack->ch.chunk_length = htons(p_len);
6006
6007         /*
6008          * Time to sign the cookie, we don't sign over the cookie signature
6009          * though thus we set trailer.
6010          */
6011         (void)sctp_hmac_m(SCTP_HMAC,
6012             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6013             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6014             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6015         /*
6016          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6017          * here since the timer will drive a retranmission.
6018          */
6019         padval = p_len % 4;
6020         if ((padval) && (mp_last)) {
6021                 /* see my previous comments on mp_last */
6022                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
6023                         /* Houston we have a problem, no space */
6024                         sctp_m_freem(m);
6025                         return;
6026                 }
6027         }
6028         if (stc.loopback_scope) {
6029                 over_addr = &store1;
6030         } else {
6031                 over_addr = NULL;
6032         }
6033
6034         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6035             0, 0,
6036             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6037             port, SCTP_SO_NOT_LOCKED, over_addr, init_pkt);
6038         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6039 }
6040
6041
6042 static void
6043 sctp_prune_prsctp(struct sctp_tcb *stcb,
6044     struct sctp_association *asoc,
6045     struct sctp_sndrcvinfo *srcv,
6046     int dataout)
6047 {
6048         int freed_spc = 0;
6049         struct sctp_tmit_chunk *chk, *nchk;
6050
6051         SCTP_TCB_LOCK_ASSERT(stcb);
6052         if ((asoc->peer_supports_prsctp) &&
6053             (asoc->sent_queue_cnt_removeable > 0)) {
6054                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6055                         /*
6056                          * Look for chunks marked with the PR_SCTP flag AND
6057                          * the buffer space flag. If the one being sent is
6058                          * equal or greater priority then purge the old one
6059                          * and free some space.
6060                          */
6061                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6062                                 /*
6063                                  * This one is PR-SCTP AND buffer space
6064                                  * limited type
6065                                  */
6066                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6067                                         /*
6068                                          * Lower numbers equates to higher
6069                                          * priority so if the one we are
6070                                          * looking at has a larger or equal
6071                                          * priority we want to drop the data
6072                                          * and NOT retransmit it.
6073                                          */
6074                                         if (chk->data) {
6075                                                 /*
6076                                                  * We release the book_size
6077                                                  * if the mbuf is here
6078                                                  */
6079                                                 int ret_spc;
6080                                                 uint8_t sent;
6081
6082                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6083                                                         sent = 1;
6084                                                 else
6085                                                         sent = 0;
6086                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6087                                                     sent,
6088                                                     SCTP_SO_LOCKED);
6089                                                 freed_spc += ret_spc;
6090                                                 if (freed_spc >= dataout) {
6091                                                         return;
6092                                                 }
6093                                         }       /* if chunk was present */
6094                                 }       /* if of sufficent priority */
6095                         }       /* if chunk has enabled */
6096                 }               /* tailqforeach */
6097
6098                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6099                         /* Here we must move to the sent queue and mark */
6100                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6101                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6102                                         if (chk->data) {
6103                                                 /*
6104                                                  * We release the book_size
6105                                                  * if the mbuf is here
6106                                                  */
6107                                                 int ret_spc;
6108
6109                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6110                                                     0, SCTP_SO_LOCKED);
6111
6112                                                 freed_spc += ret_spc;
6113                                                 if (freed_spc >= dataout) {
6114                                                         return;
6115                                                 }
6116                                         }       /* end if chk->data */
6117                                 }       /* end if right class */
6118                         }       /* end if chk pr-sctp */
6119                 }               /* tailqforeachsafe (chk) */
6120         }                       /* if enabled in asoc */
6121 }
6122
6123 int
6124 sctp_get_frag_point(struct sctp_tcb *stcb,
6125     struct sctp_association *asoc)
6126 {
6127         int siz, ovh;
6128
6129         /*
6130          * For endpoints that have both v6 and v4 addresses we must reserve
6131          * room for the ipv6 header, for those that are only dealing with V4
6132          * we use a larger frag point.
6133          */
6134         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6135                 ovh = SCTP_MED_OVERHEAD;
6136         } else {
6137                 ovh = SCTP_MED_V4_OVERHEAD;
6138         }
6139
6140         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6141                 siz = asoc->smallest_mtu - ovh;
6142         else
6143                 siz = (stcb->asoc.sctp_frag_point - ovh);
6144         /*
6145          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6146          */
6147         /* A data chunk MUST fit in a cluster */
6148         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6149         /* } */
6150
6151         /* adjust for an AUTH chunk if DATA requires auth */
6152         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6153                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6154
6155         if (siz % 4) {
6156                 /* make it an even word boundary please */
6157                 siz -= (siz % 4);
6158         }
6159         return (siz);
6160 }
6161
6162 static void
6163 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6164 {
6165         sp->pr_sctp_on = 0;
6166         /*
6167          * We assume that the user wants PR_SCTP_TTL if the user provides a
6168          * positive lifetime but does not specify any PR_SCTP policy. This
6169          * is a BAD assumption and causes problems at least with the
6170          * U-Vancovers MPI folks. I will change this to be no policy means
6171          * NO PR-SCTP.
6172          */
6173         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6174                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6175                 sp->pr_sctp_on = 1;
6176         } else {
6177                 return;
6178         }
6179         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6180         case CHUNK_FLAGS_PR_SCTP_BUF:
6181                 /*
6182                  * Time to live is a priority stored in tv_sec when doing
6183                  * the buffer drop thing.
6184                  */
6185                 sp->ts.tv_sec = sp->timetolive;
6186                 sp->ts.tv_usec = 0;
6187                 break;
6188         case CHUNK_FLAGS_PR_SCTP_TTL:
6189                 {
6190                         struct timeval tv;
6191
6192                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6193                         tv.tv_sec = sp->timetolive / 1000;
6194                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6195                         /*
6196                          * TODO sctp_constants.h needs alternative time
6197                          * macros when _KERNEL is undefined.
6198                          */
6199                         timevaladd(&sp->ts, &tv);
6200                 }
6201                 break;
6202         case CHUNK_FLAGS_PR_SCTP_RTX:
6203                 /*
6204                  * Time to live is a the number or retransmissions stored in
6205                  * tv_sec.
6206                  */
6207                 sp->ts.tv_sec = sp->timetolive;
6208                 sp->ts.tv_usec = 0;
6209                 break;
6210         default:
6211                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6212                     "Unknown PR_SCTP policy %u.\n",
6213                     PR_SCTP_POLICY(sp->sinfo_flags));
6214                 break;
6215         }
6216 }
6217
6218 static int
6219 sctp_msg_append(struct sctp_tcb *stcb,
6220     struct sctp_nets *net,
6221     struct mbuf *m,
6222     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6223 {
6224         int error = 0;
6225         struct mbuf *at;
6226         struct sctp_stream_queue_pending *sp = NULL;
6227         struct sctp_stream_out *strm;
6228
6229         /*
6230          * Given an mbuf chain, put it into the association send queue and
6231          * place it on the wheel
6232          */
6233         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6234                 /* Invalid stream number */
6235                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6236                 error = EINVAL;
6237                 goto out_now;
6238         }
6239         if ((stcb->asoc.stream_locked) &&
6240             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6241                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6242                 error = EINVAL;
6243                 goto out_now;
6244         }
6245         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6246         /* Now can we send this? */
6247         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6248             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6249             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6250             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6251                 /* got data while shutting down */
6252                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6253                 error = ECONNRESET;
6254                 goto out_now;
6255         }
6256         sctp_alloc_a_strmoq(stcb, sp);
6257         if (sp == NULL) {
6258                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6259                 error = ENOMEM;
6260                 goto out_now;
6261         }
6262         sp->sinfo_flags = srcv->sinfo_flags;
6263         sp->timetolive = srcv->sinfo_timetolive;
6264         sp->ppid = srcv->sinfo_ppid;
6265         sp->context = srcv->sinfo_context;
6266         sp->strseq = 0;
6267         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6268                 sp->net = net;
6269                 atomic_add_int(&sp->net->ref_count, 1);
6270         } else {
6271                 sp->net = NULL;
6272         }
6273         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6274         sp->stream = srcv->sinfo_stream;
6275         sp->msg_is_complete = 1;
6276         sp->sender_all_done = 1;
6277         sp->some_taken = 0;
6278         sp->data = m;
6279         sp->tail_mbuf = NULL;
6280         sctp_set_prsctp_policy(sp);
6281         /*
6282          * We could in theory (for sendall) sifa the length in, but we would
6283          * still have to hunt through the chain since we need to setup the
6284          * tail_mbuf
6285          */
6286         sp->length = 0;
6287         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6288                 if (SCTP_BUF_NEXT(at) == NULL)
6289                         sp->tail_mbuf = at;
6290                 sp->length += SCTP_BUF_LEN(at);
6291         }
6292         if (srcv->sinfo_keynumber_valid) {
6293                 sp->auth_keyid = srcv->sinfo_keynumber;
6294         } else {
6295                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6296         }
6297         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6298                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6299                 sp->holds_key_ref = 1;
6300         }
6301         if (hold_stcb_lock == 0) {
6302                 SCTP_TCB_SEND_LOCK(stcb);
6303         }
6304         sctp_snd_sb_alloc(stcb, sp->length);
6305         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6306         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6307         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6308                 sp->strseq = strm->next_sequence_sent;
6309                 strm->next_sequence_sent++;
6310         }
6311         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6312         m = NULL;
6313         if (hold_stcb_lock == 0) {
6314                 SCTP_TCB_SEND_UNLOCK(stcb);
6315         }
6316 out_now:
6317         if (m) {
6318                 sctp_m_freem(m);
6319         }
6320         return (error);
6321 }
6322
6323
6324 static struct mbuf *
6325 sctp_copy_mbufchain(struct mbuf *clonechain,
6326     struct mbuf *outchain,
6327     struct mbuf **endofchain,
6328     int can_take_mbuf,
6329     int sizeofcpy,
6330     uint8_t copy_by_ref)
6331 {
6332         struct mbuf *m;
6333         struct mbuf *appendchain;
6334         caddr_t cp;
6335         int len;
6336
6337         if (endofchain == NULL) {
6338                 /* error */
6339 error_out:
6340                 if (outchain)
6341                         sctp_m_freem(outchain);
6342                 return (NULL);
6343         }
6344         if (can_take_mbuf) {
6345                 appendchain = clonechain;
6346         } else {
6347                 if (!copy_by_ref &&
6348                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6349                     ) {
6350                         /* Its not in a cluster */
6351                         if (*endofchain == NULL) {
6352                                 /* lets get a mbuf cluster */
6353                                 if (outchain == NULL) {
6354                                         /* This is the general case */
6355                         new_mbuf:
6356                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6357                                         if (outchain == NULL) {
6358                                                 goto error_out;
6359                                         }
6360                                         SCTP_BUF_LEN(outchain) = 0;
6361                                         *endofchain = outchain;
6362                                         /* get the prepend space */
6363                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6364                                 } else {
6365                                         /*
6366                                          * We really should not get a NULL
6367                                          * in endofchain
6368                                          */
6369                                         /* find end */
6370                                         m = outchain;
6371                                         while (m) {
6372                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6373                                                         *endofchain = m;
6374                                                         break;
6375                                                 }
6376                                                 m = SCTP_BUF_NEXT(m);
6377                                         }
6378                                         /* sanity */
6379                                         if (*endofchain == NULL) {
6380                                                 /*
6381                                                  * huh, TSNH XXX maybe we
6382                                                  * should panic
6383                                                  */
6384                                                 sctp_m_freem(outchain);
6385                                                 goto new_mbuf;
6386                                         }
6387                                 }
6388                                 /* get the new end of length */
6389                                 len = M_TRAILINGSPACE(*endofchain);
6390                         } else {
6391                                 /* how much is left at the end? */
6392                                 len = M_TRAILINGSPACE(*endofchain);
6393                         }
6394                         /* Find the end of the data, for appending */
6395                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6396
6397                         /* Now lets copy it out */
6398                         if (len >= sizeofcpy) {
6399                                 /* It all fits, copy it in */
6400                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6401                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6402                         } else {
6403                                 /* fill up the end of the chain */
6404                                 if (len > 0) {
6405                                         m_copydata(clonechain, 0, len, cp);
6406                                         SCTP_BUF_LEN((*endofchain)) += len;
6407                                         /* now we need another one */
6408                                         sizeofcpy -= len;
6409                                 }
6410                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6411                                 if (m == NULL) {
6412                                         /* We failed */
6413                                         goto error_out;
6414                                 }
6415                                 SCTP_BUF_NEXT((*endofchain)) = m;
6416                                 *endofchain = m;
6417                                 cp = mtod((*endofchain), caddr_t);
6418                                 m_copydata(clonechain, len, sizeofcpy, cp);
6419                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6420                         }
6421                         return (outchain);
6422                 } else {
6423                         /* copy the old fashion way */
6424                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6425 #ifdef SCTP_MBUF_LOGGING
6426                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6427                                 struct mbuf *mat;
6428
6429                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6430                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6431                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6432                                         }
6433                                 }
6434                         }
6435 #endif
6436                 }
6437         }
6438         if (appendchain == NULL) {
6439                 /* error */
6440                 if (outchain)
6441                         sctp_m_freem(outchain);
6442                 return (NULL);
6443         }
6444         if (outchain) {
6445                 /* tack on to the end */
6446                 if (*endofchain != NULL) {
6447                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6448                 } else {
6449                         m = outchain;
6450                         while (m) {
6451                                 if (SCTP_BUF_NEXT(m) == NULL) {
6452                                         SCTP_BUF_NEXT(m) = appendchain;
6453                                         break;
6454                                 }
6455                                 m = SCTP_BUF_NEXT(m);
6456                         }
6457                 }
6458                 /*
6459                  * save off the end and update the end-chain postion
6460                  */
6461                 m = appendchain;
6462                 while (m) {
6463                         if (SCTP_BUF_NEXT(m) == NULL) {
6464                                 *endofchain = m;
6465                                 break;
6466                         }
6467                         m = SCTP_BUF_NEXT(m);
6468                 }
6469                 return (outchain);
6470         } else {
6471                 /* save off the end and update the end-chain postion */
6472                 m = appendchain;
6473                 while (m) {
6474                         if (SCTP_BUF_NEXT(m) == NULL) {
6475                                 *endofchain = m;
6476                                 break;
6477                         }
6478                         m = SCTP_BUF_NEXT(m);
6479                 }
6480                 return (appendchain);
6481         }
6482 }
6483
6484 int
6485 sctp_med_chunk_output(struct sctp_inpcb *inp,
6486     struct sctp_tcb *stcb,
6487     struct sctp_association *asoc,
6488     int *num_out,
6489     int *reason_code,
6490     int control_only, int from_where,
6491     struct timeval *now, int *now_filled, int frag_point, int so_locked
6492 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6493     SCTP_UNUSED
6494 #endif
6495 );
6496
6497 static void
6498 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6499     uint32_t val SCTP_UNUSED)
6500 {
6501         struct sctp_copy_all *ca;
6502         struct mbuf *m;
6503         int ret = 0;
6504         int added_control = 0;
6505         int un_sent, do_chunk_output = 1;
6506         struct sctp_association *asoc;
6507         struct sctp_nets *net;
6508
6509         ca = (struct sctp_copy_all *)ptr;
6510         if (ca->m == NULL) {
6511                 return;
6512         }
6513         if (ca->inp != inp) {
6514                 /* TSNH */
6515                 return;
6516         }
6517         if ((ca->m) && ca->sndlen) {
6518                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6519                 if (m == NULL) {
6520                         /* can't copy so we are done */
6521                         ca->cnt_failed++;
6522                         return;
6523                 }
6524 #ifdef SCTP_MBUF_LOGGING
6525                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6526                         struct mbuf *mat;
6527
6528                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6529                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6530                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6531                                 }
6532                         }
6533                 }
6534 #endif
6535         } else {
6536                 m = NULL;
6537         }
6538         SCTP_TCB_LOCK_ASSERT(stcb);
6539         if (stcb->asoc.alternate) {
6540                 net = stcb->asoc.alternate;
6541         } else {
6542                 net = stcb->asoc.primary_destination;
6543         }
6544         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6545                 /* Abort this assoc with m as the user defined reason */
6546                 if (m) {
6547                         struct sctp_paramhdr *ph;
6548
6549                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6550                         if (m) {
6551                                 ph = mtod(m, struct sctp_paramhdr *);
6552                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6553                                 ph->param_length = htons(ca->sndlen);
6554                         }
6555                         /*
6556                          * We add one here to keep the assoc from
6557                          * dis-appearing on us.
6558                          */
6559                         atomic_add_int(&stcb->asoc.refcnt, 1);
6560                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6561                         /*
6562                          * sctp_abort_an_association calls sctp_free_asoc()
6563                          * free association will NOT free it since we
6564                          * incremented the refcnt .. we do this to prevent
6565                          * it being freed and things getting tricky since we
6566                          * could end up (from free_asoc) calling inpcb_free
6567                          * which would get a recursive lock call to the
6568                          * iterator lock.. But as a consequence of that the
6569                          * stcb will return to us un-locked.. since
6570                          * free_asoc returns with either no TCB or the TCB
6571                          * unlocked, we must relock.. to unlock in the
6572                          * iterator timer :-0
6573                          */
6574                         SCTP_TCB_LOCK(stcb);
6575                         atomic_add_int(&stcb->asoc.refcnt, -1);
6576                         goto no_chunk_output;
6577                 }
6578         } else {
6579                 if (m) {
6580                         ret = sctp_msg_append(stcb, net, m,
6581                             &ca->sndrcv, 1);
6582                 }
6583                 asoc = &stcb->asoc;
6584                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6585                         /* shutdown this assoc */
6586                         int cnt;
6587
6588                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6589
6590                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6591                             TAILQ_EMPTY(&asoc->sent_queue) &&
6592                             (cnt == 0)) {
6593                                 if (asoc->locked_on_sending) {
6594                                         goto abort_anyway;
6595                                 }
6596                                 /*
6597                                  * there is nothing queued to send, so I'm
6598                                  * done...
6599                                  */
6600                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6601                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6602                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6603                                         /*
6604                                          * only send SHUTDOWN the first time
6605                                          * through
6606                                          */
6607                                         sctp_send_shutdown(stcb, net);
6608                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6609                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6610                                         }
6611                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6612                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6613                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6614                                             net);
6615                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6616                                             asoc->primary_destination);
6617                                         added_control = 1;
6618                                         do_chunk_output = 0;
6619                                 }
6620                         } else {
6621                                 /*
6622                                  * we still got (or just got) data to send,
6623                                  * so set SHUTDOWN_PENDING
6624                                  */
6625                                 /*
6626                                  * XXX sockets draft says that SCTP_EOF
6627                                  * should be sent with no data.  currently,
6628                                  * we will allow user data to be sent first
6629                                  * and move to SHUTDOWN-PENDING
6630                                  */
6631                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6632                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6633                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6634                                         if (asoc->locked_on_sending) {
6635                                                 /*
6636                                                  * Locked to send out the
6637                                                  * data
6638                                                  */
6639                                                 struct sctp_stream_queue_pending *sp;
6640
6641                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6642                                                 if (sp) {
6643                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6644                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6645                                                 }
6646                                         }
6647                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6648                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6649                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6650                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6651                                 abort_anyway:
6652                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6653                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6654                                                     NULL, SCTP_SO_NOT_LOCKED);
6655                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6656                                                 goto no_chunk_output;
6657                                         }
6658                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6659                                             asoc->primary_destination);
6660                                 }
6661                         }
6662
6663                 }
6664         }
6665         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6666             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6667
6668         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6669             (stcb->asoc.total_flight > 0) &&
6670             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6671             ) {
6672                 do_chunk_output = 0;
6673         }
6674         if (do_chunk_output)
6675                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6676         else if (added_control) {
6677                 int num_out = 0, reason = 0, now_filled = 0;
6678                 struct timeval now;
6679                 int frag_point;
6680
6681                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6682                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6683                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6684         }
6685 no_chunk_output:
6686         if (ret) {
6687                 ca->cnt_failed++;
6688         } else {
6689                 ca->cnt_sent++;
6690         }
6691 }
6692
6693 static void
6694 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6695 {
6696         struct sctp_copy_all *ca;
6697
6698         ca = (struct sctp_copy_all *)ptr;
6699         /*
6700          * Do a notify here? Kacheong suggests that the notify be done at
6701          * the send time.. so you would push up a notification if any send
6702          * failed. Don't know if this is feasable since the only failures we
6703          * have is "memory" related and if you cannot get an mbuf to send
6704          * the data you surely can't get an mbuf to send up to notify the
6705          * user you can't send the data :->
6706          */
6707
6708         /* now free everything */
6709         sctp_m_freem(ca->m);
6710         SCTP_FREE(ca, SCTP_M_COPYAL);
6711 }
6712
6713
6714 #define MC_ALIGN(m, len) do {                                           \
6715         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6716 } while (0)
6717
6718
6719
6720 static struct mbuf *
6721 sctp_copy_out_all(struct uio *uio, int len)
6722 {
6723         struct mbuf *ret, *at;
6724         int left, willcpy, cancpy, error;
6725
6726         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6727         if (ret == NULL) {
6728                 /* TSNH */
6729                 return (NULL);
6730         }
6731         left = len;
6732         SCTP_BUF_LEN(ret) = 0;
6733         /* save space for the data chunk header */
6734         cancpy = M_TRAILINGSPACE(ret);
6735         willcpy = min(cancpy, left);
6736         at = ret;
6737         while (left > 0) {
6738                 /* Align data to the end */
6739                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6740                 if (error) {
6741         err_out_now:
6742                         sctp_m_freem(at);
6743                         return (NULL);
6744                 }
6745                 SCTP_BUF_LEN(at) = willcpy;
6746                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6747                 left -= willcpy;
6748                 if (left > 0) {
6749                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6750                         if (SCTP_BUF_NEXT(at) == NULL) {
6751                                 goto err_out_now;
6752                         }
6753                         at = SCTP_BUF_NEXT(at);
6754                         SCTP_BUF_LEN(at) = 0;
6755                         cancpy = M_TRAILINGSPACE(at);
6756                         willcpy = min(cancpy, left);
6757                 }
6758         }
6759         return (ret);
6760 }
6761
6762 static int
6763 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6764     struct sctp_sndrcvinfo *srcv)
6765 {
6766         int ret;
6767         struct sctp_copy_all *ca;
6768
6769         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6770             SCTP_M_COPYAL);
6771         if (ca == NULL) {
6772                 sctp_m_freem(m);
6773                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6774                 return (ENOMEM);
6775         }
6776         memset(ca, 0, sizeof(struct sctp_copy_all));
6777
6778         ca->inp = inp;
6779         if (srcv) {
6780                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6781         }
6782         /*
6783          * take off the sendall flag, it would be bad if we failed to do
6784          * this :-0
6785          */
6786         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6787         /* get length and mbuf chain */
6788         if (uio) {
6789                 ca->sndlen = uio->uio_resid;
6790                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6791                 if (ca->m == NULL) {
6792                         SCTP_FREE(ca, SCTP_M_COPYAL);
6793                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6794                         return (ENOMEM);
6795                 }
6796         } else {
6797                 /* Gather the length of the send */
6798                 struct mbuf *mat;
6799
6800                 mat = m;
6801                 ca->sndlen = 0;
6802                 while (m) {
6803                         ca->sndlen += SCTP_BUF_LEN(m);
6804                         m = SCTP_BUF_NEXT(m);
6805                 }
6806                 ca->m = mat;
6807         }
6808         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6809             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6810             SCTP_ASOC_ANY_STATE,
6811             (void *)ca, 0,
6812             sctp_sendall_completes, inp, 1);
6813         if (ret) {
6814                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6815                 SCTP_FREE(ca, SCTP_M_COPYAL);
6816                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6817                 return (EFAULT);
6818         }
6819         return (0);
6820 }
6821
6822
6823 void
6824 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6825 {
6826         struct sctp_tmit_chunk *chk, *nchk;
6827
6828         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6829                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6830                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6831                         if (chk->data) {
6832                                 sctp_m_freem(chk->data);
6833                                 chk->data = NULL;
6834                         }
6835                         asoc->ctrl_queue_cnt--;
6836                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6837                 }
6838         }
6839 }
6840
6841 void
6842 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6843 {
6844         struct sctp_association *asoc;
6845         struct sctp_tmit_chunk *chk, *nchk;
6846         struct sctp_asconf_chunk *acp;
6847
6848         asoc = &stcb->asoc;
6849         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6850                 /* find SCTP_ASCONF chunk in queue */
6851                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6852                         if (chk->data) {
6853                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6854                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6855                                         /* Not Acked yet */
6856                                         break;
6857                                 }
6858                         }
6859                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6860                         if (chk->data) {
6861                                 sctp_m_freem(chk->data);
6862                                 chk->data = NULL;
6863                         }
6864                         asoc->ctrl_queue_cnt--;
6865                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6866                 }
6867         }
6868 }
6869
6870
6871 static void
6872 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6873     struct sctp_association *asoc,
6874     struct sctp_tmit_chunk **data_list,
6875     int bundle_at,
6876     struct sctp_nets *net)
6877 {
6878         int i;
6879         struct sctp_tmit_chunk *tp1;
6880
6881         for (i = 0; i < bundle_at; i++) {
6882                 /* off of the send queue */
6883                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6884                 asoc->send_queue_cnt--;
6885                 if (i > 0) {
6886                         /*
6887                          * Any chunk NOT 0 you zap the time chunk 0 gets
6888                          * zapped or set based on if a RTO measurment is
6889                          * needed.
6890                          */
6891                         data_list[i]->do_rtt = 0;
6892                 }
6893                 /* record time */
6894                 data_list[i]->sent_rcv_time = net->last_sent_time;
6895                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6896                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6897                 if (data_list[i]->whoTo == NULL) {
6898                         data_list[i]->whoTo = net;
6899                         atomic_add_int(&net->ref_count, 1);
6900                 }
6901                 /* on to the sent queue */
6902                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6903                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6904                         struct sctp_tmit_chunk *tpp;
6905
6906                         /* need to move back */
6907         back_up_more:
6908                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6909                         if (tpp == NULL) {
6910                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6911                                 goto all_done;
6912                         }
6913                         tp1 = tpp;
6914                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6915                                 goto back_up_more;
6916                         }
6917                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6918                 } else {
6919                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6920                             data_list[i],
6921                             sctp_next);
6922                 }
6923 all_done:
6924                 /* This does not lower until the cum-ack passes it */
6925                 asoc->sent_queue_cnt++;
6926                 if ((asoc->peers_rwnd <= 0) &&
6927                     (asoc->total_flight == 0) &&
6928                     (bundle_at == 1)) {
6929                         /* Mark the chunk as being a window probe */
6930                         SCTP_STAT_INCR(sctps_windowprobed);
6931                 }
6932 #ifdef SCTP_AUDITING_ENABLED
6933                 sctp_audit_log(0xC2, 3);
6934 #endif
6935                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6936                 data_list[i]->snd_count = 1;
6937                 data_list[i]->rec.data.chunk_was_revoked = 0;
6938                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6939                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6940                             data_list[i]->whoTo->flight_size,
6941                             data_list[i]->book_size,
6942                             (uintptr_t) data_list[i]->whoTo,
6943                             data_list[i]->rec.data.TSN_seq);
6944                 }
6945                 sctp_flight_size_increase(data_list[i]);
6946                 sctp_total_flight_increase(stcb, data_list[i]);
6947                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6948                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6949                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6950                 }
6951                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6952                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6953                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6954                         /* SWS sender side engages */
6955                         asoc->peers_rwnd = 0;
6956                 }
6957         }
6958         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6959                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6960         }
6961 }
6962
6963 static void
6964 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6965 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6966     SCTP_UNUSED
6967 #endif
6968 )
6969 {
6970         struct sctp_tmit_chunk *chk, *nchk;
6971
6972         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6973                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6974                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6975                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6976                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6977                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6978                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6979                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6980                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6981                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6982                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6983                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6984                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6985                         /* Stray chunks must be cleaned up */
6986         clean_up_anyway:
6987                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6988                         if (chk->data) {
6989                                 sctp_m_freem(chk->data);
6990                                 chk->data = NULL;
6991                         }
6992                         asoc->ctrl_queue_cnt--;
6993                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6994                                 asoc->fwd_tsn_cnt--;
6995                         sctp_free_a_chunk(stcb, chk, so_locked);
6996                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6997                         /* special handling, we must look into the param */
6998                         if (chk != asoc->str_reset) {
6999                                 goto clean_up_anyway;
7000                         }
7001                 }
7002         }
7003 }
7004
7005
7006 static int
7007 sctp_can_we_split_this(struct sctp_tcb *stcb,
7008     uint32_t length,
7009     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7010 {
7011         /*
7012          * Make a decision on if I should split a msg into multiple parts.
7013          * This is only asked of incomplete messages.
7014          */
7015         if (eeor_on) {
7016                 /*
7017                  * If we are doing EEOR we need to always send it if its the
7018                  * entire thing, since it might be all the guy is putting in
7019                  * the hopper.
7020                  */
7021                 if (goal_mtu >= length) {
7022                         /*-
7023                          * If we have data outstanding,
7024                          * we get another chance when the sack
7025                          * arrives to transmit - wait for more data
7026                          */
7027                         if (stcb->asoc.total_flight == 0) {
7028                                 /*
7029                                  * If nothing is in flight, we zero the
7030                                  * packet counter.
7031                                  */
7032                                 return (length);
7033                         }
7034                         return (0);
7035
7036                 } else {
7037                         /* You can fill the rest */
7038                         return (goal_mtu);
7039                 }
7040         }
7041         /*-
7042          * For those strange folk that make the send buffer
7043          * smaller than our fragmentation point, we can't
7044          * get a full msg in so we have to allow splitting.
7045          */
7046         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7047                 return (length);
7048         }
7049         if ((length <= goal_mtu) ||
7050             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7051                 /* Sub-optimial residual don't split in non-eeor mode. */
7052                 return (0);
7053         }
7054         /*
7055          * If we reach here length is larger than the goal_mtu. Do we wish
7056          * to split it for the sake of packet putting together?
7057          */
7058         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7059                 /* Its ok to split it */
7060                 return (min(goal_mtu, frag_point));
7061         }
7062         /* Nope, can't split */
7063         return (0);
7064
7065 }
7066
7067 static uint32_t
7068 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7069     struct sctp_stream_out *strq,
7070     uint32_t goal_mtu,
7071     uint32_t frag_point,
7072     int *locked,
7073     int *giveup,
7074     int eeor_mode,
7075     int *bail,
7076     int so_locked
7077 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7078     SCTP_UNUSED
7079 #endif
7080 )
7081 {
7082         /* Move from the stream to the send_queue keeping track of the total */
7083         struct sctp_association *asoc;
7084         struct sctp_stream_queue_pending *sp;
7085         struct sctp_tmit_chunk *chk;
7086         struct sctp_data_chunk *dchkh;
7087         uint32_t to_move, length;
7088         uint8_t rcv_flags = 0;
7089         uint8_t some_taken;
7090         uint8_t send_lock_up = 0;
7091
7092         SCTP_TCB_LOCK_ASSERT(stcb);
7093         asoc = &stcb->asoc;
7094 one_more_time:
7095         /* sa_ignore FREED_MEMORY */
7096         sp = TAILQ_FIRST(&strq->outqueue);
7097         if (sp == NULL) {
7098                 *locked = 0;
7099                 if (send_lock_up == 0) {
7100                         SCTP_TCB_SEND_LOCK(stcb);
7101                         send_lock_up = 1;
7102                 }
7103                 sp = TAILQ_FIRST(&strq->outqueue);
7104                 if (sp) {
7105                         goto one_more_time;
7106                 }
7107                 if (strq->last_msg_incomplete) {
7108                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7109                             strq->stream_no,
7110                             strq->last_msg_incomplete);
7111                         strq->last_msg_incomplete = 0;
7112                 }
7113                 to_move = 0;
7114                 if (send_lock_up) {
7115                         SCTP_TCB_SEND_UNLOCK(stcb);
7116                         send_lock_up = 0;
7117                 }
7118                 goto out_of;
7119         }
7120         if ((sp->msg_is_complete) && (sp->length == 0)) {
7121                 if (sp->sender_all_done) {
7122                         /*
7123                          * We are doing differed cleanup. Last time through
7124                          * when we took all the data the sender_all_done was
7125                          * not set.
7126                          */
7127                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7128                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7129                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7130                                     sp->sender_all_done,
7131                                     sp->length,
7132                                     sp->msg_is_complete,
7133                                     sp->put_last_out,
7134                                     send_lock_up);
7135                         }
7136                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7137                                 SCTP_TCB_SEND_LOCK(stcb);
7138                                 send_lock_up = 1;
7139                         }
7140                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7141                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7142                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7143                         if (sp->net) {
7144                                 sctp_free_remote_addr(sp->net);
7145                                 sp->net = NULL;
7146                         }
7147                         if (sp->data) {
7148                                 sctp_m_freem(sp->data);
7149                                 sp->data = NULL;
7150                         }
7151                         sctp_free_a_strmoq(stcb, sp, so_locked);
7152                         /* we can't be locked to it */
7153                         *locked = 0;
7154                         stcb->asoc.locked_on_sending = NULL;
7155                         if (send_lock_up) {
7156                                 SCTP_TCB_SEND_UNLOCK(stcb);
7157                                 send_lock_up = 0;
7158                         }
7159                         /* back to get the next msg */
7160                         goto one_more_time;
7161                 } else {
7162                         /*
7163                          * sender just finished this but still holds a
7164                          * reference
7165                          */
7166                         *locked = 1;
7167                         *giveup = 1;
7168                         to_move = 0;
7169                         goto out_of;
7170                 }
7171         } else {
7172                 /* is there some to get */
7173                 if (sp->length == 0) {
7174                         /* no */
7175                         *locked = 1;
7176                         *giveup = 1;
7177                         to_move = 0;
7178                         goto out_of;
7179                 } else if (sp->discard_rest) {
7180                         if (send_lock_up == 0) {
7181                                 SCTP_TCB_SEND_LOCK(stcb);
7182                                 send_lock_up = 1;
7183                         }
7184                         /* Whack down the size */
7185                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7186                         if ((stcb->sctp_socket != NULL) && \
7187                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7188                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7189                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7190                         }
7191                         if (sp->data) {
7192                                 sctp_m_freem(sp->data);
7193                                 sp->data = NULL;
7194                                 sp->tail_mbuf = NULL;
7195                         }
7196                         sp->length = 0;
7197                         sp->some_taken = 1;
7198                         *locked = 1;
7199                         *giveup = 1;
7200                         to_move = 0;
7201                         goto out_of;
7202                 }
7203         }
7204         some_taken = sp->some_taken;
7205         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7206                 sp->msg_is_complete = 1;
7207         }
7208 re_look:
7209         length = sp->length;
7210         if (sp->msg_is_complete) {
7211                 /* The message is complete */
7212                 to_move = min(length, frag_point);
7213                 if (to_move == length) {
7214                         /* All of it fits in the MTU */
7215                         if (sp->some_taken) {
7216                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7217                                 sp->put_last_out = 1;
7218                         } else {
7219                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7220                                 sp->put_last_out = 1;
7221                         }
7222                 } else {
7223                         /* Not all of it fits, we fragment */
7224                         if (sp->some_taken == 0) {
7225                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7226                         }
7227                         sp->some_taken = 1;
7228                 }
7229         } else {
7230                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7231                 if (to_move) {
7232                         /*-
7233                          * We use a snapshot of length in case it
7234                          * is expanding during the compare.
7235                          */
7236                         uint32_t llen;
7237
7238                         llen = length;
7239                         if (to_move >= llen) {
7240                                 to_move = llen;
7241                                 if (send_lock_up == 0) {
7242                                         /*-
7243                                          * We are taking all of an incomplete msg
7244                                          * thus we need a send lock.
7245                                          */
7246                                         SCTP_TCB_SEND_LOCK(stcb);
7247                                         send_lock_up = 1;
7248                                         if (sp->msg_is_complete) {
7249                                                 /*
7250                                                  * the sender finished the
7251                                                  * msg
7252                                                  */
7253                                                 goto re_look;
7254                                         }
7255                                 }
7256                         }
7257                         if (sp->some_taken == 0) {
7258                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7259                                 sp->some_taken = 1;
7260                         }
7261                 } else {
7262                         /* Nothing to take. */
7263                         if (sp->some_taken) {
7264                                 *locked = 1;
7265                         }
7266                         *giveup = 1;
7267                         to_move = 0;
7268                         goto out_of;
7269                 }
7270         }
7271
7272         /* If we reach here, we can copy out a chunk */
7273         sctp_alloc_a_chunk(stcb, chk);
7274         if (chk == NULL) {
7275                 /* No chunk memory */
7276                 *giveup = 1;
7277                 to_move = 0;
7278                 goto out_of;
7279         }
7280         /*
7281          * Setup for unordered if needed by looking at the user sent info
7282          * flags.
7283          */
7284         if (sp->sinfo_flags & SCTP_UNORDERED) {
7285                 rcv_flags |= SCTP_DATA_UNORDERED;
7286         }
7287         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7288             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7289                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7290         }
7291         /* clear out the chunk before setting up */
7292         memset(chk, 0, sizeof(*chk));
7293         chk->rec.data.rcv_flags = rcv_flags;
7294
7295         if (to_move >= length) {
7296                 /* we think we can steal the whole thing */
7297                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7298                         SCTP_TCB_SEND_LOCK(stcb);
7299                         send_lock_up = 1;
7300                 }
7301                 if (to_move < sp->length) {
7302                         /* bail, it changed */
7303                         goto dont_do_it;
7304                 }
7305                 chk->data = sp->data;
7306                 chk->last_mbuf = sp->tail_mbuf;
7307                 /* register the stealing */
7308                 sp->data = sp->tail_mbuf = NULL;
7309         } else {
7310                 struct mbuf *m;
7311
7312 dont_do_it:
7313                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7314                 chk->last_mbuf = NULL;
7315                 if (chk->data == NULL) {
7316                         sp->some_taken = some_taken;
7317                         sctp_free_a_chunk(stcb, chk, so_locked);
7318                         *bail = 1;
7319                         to_move = 0;
7320                         goto out_of;
7321                 }
7322 #ifdef SCTP_MBUF_LOGGING
7323                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7324                         struct mbuf *mat;
7325
7326                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7327                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7328                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7329                                 }
7330                         }
7331                 }
7332 #endif
7333                 /* Pull off the data */
7334                 m_adj(sp->data, to_move);
7335                 /* Now lets work our way down and compact it */
7336                 m = sp->data;
7337                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7338                         sp->data = SCTP_BUF_NEXT(m);
7339                         SCTP_BUF_NEXT(m) = NULL;
7340                         if (sp->tail_mbuf == m) {
7341                                 /*-
7342                                  * Freeing tail? TSNH since
7343                                  * we supposedly were taking less
7344                                  * than the sp->length.
7345                                  */
7346 #ifdef INVARIANTS
7347                                 panic("Huh, freing tail? - TSNH");
7348 #else
7349                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7350                                 sp->tail_mbuf = sp->data = NULL;
7351                                 sp->length = 0;
7352 #endif
7353
7354                         }
7355                         sctp_m_free(m);
7356                         m = sp->data;
7357                 }
7358         }
7359         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7360                 chk->copy_by_ref = 1;
7361         } else {
7362                 chk->copy_by_ref = 0;
7363         }
7364         /*
7365          * get last_mbuf and counts of mb useage This is ugly but hopefully
7366          * its only one mbuf.
7367          */
7368         if (chk->last_mbuf == NULL) {
7369                 chk->last_mbuf = chk->data;
7370                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7371                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7372                 }
7373         }
7374         if (to_move > length) {
7375                 /*- This should not happen either
7376                  * since we always lower to_move to the size
7377                  * of sp->length if its larger.
7378                  */
7379 #ifdef INVARIANTS
7380                 panic("Huh, how can to_move be larger?");
7381 #else
7382                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7383                 sp->length = 0;
7384 #endif
7385         } else {
7386                 atomic_subtract_int(&sp->length, to_move);
7387         }
7388         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7389                 /* Not enough room for a chunk header, get some */
7390                 struct mbuf *m;
7391
7392                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7393                 if (m == NULL) {
7394                         /*
7395                          * we're in trouble here. _PREPEND below will free
7396                          * all the data if there is no leading space, so we
7397                          * must put the data back and restore.
7398                          */
7399                         if (send_lock_up == 0) {
7400                                 SCTP_TCB_SEND_LOCK(stcb);
7401                                 send_lock_up = 1;
7402                         }
7403                         if (chk->data == NULL) {
7404                                 /* unsteal the data */
7405                                 sp->data = chk->data;
7406                                 sp->tail_mbuf = chk->last_mbuf;
7407                         } else {
7408                                 struct mbuf *m_tmp;
7409
7410                                 /* reassemble the data */
7411                                 m_tmp = sp->data;
7412                                 sp->data = chk->data;
7413                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7414                         }
7415                         sp->some_taken = some_taken;
7416                         atomic_add_int(&sp->length, to_move);
7417                         chk->data = NULL;
7418                         *bail = 1;
7419                         sctp_free_a_chunk(stcb, chk, so_locked);
7420                         to_move = 0;
7421                         goto out_of;
7422                 } else {
7423                         SCTP_BUF_LEN(m) = 0;
7424                         SCTP_BUF_NEXT(m) = chk->data;
7425                         chk->data = m;
7426                         M_ALIGN(chk->data, 4);
7427                 }
7428         }
7429         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7430         if (chk->data == NULL) {
7431                 /* HELP, TSNH since we assured it would not above? */
7432 #ifdef INVARIANTS
7433                 panic("prepend failes HELP?");
7434 #else
7435                 SCTP_PRINTF("prepend fails HELP?\n");
7436                 sctp_free_a_chunk(stcb, chk, so_locked);
7437 #endif
7438                 *bail = 1;
7439                 to_move = 0;
7440                 goto out_of;
7441         }
7442         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7443         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7444         chk->book_size_scale = 0;
7445         chk->sent = SCTP_DATAGRAM_UNSENT;
7446
7447         chk->flags = 0;
7448         chk->asoc = &stcb->asoc;
7449         chk->pad_inplace = 0;
7450         chk->no_fr_allowed = 0;
7451         chk->rec.data.stream_seq = sp->strseq;
7452         chk->rec.data.stream_number = sp->stream;
7453         chk->rec.data.payloadtype = sp->ppid;
7454         chk->rec.data.context = sp->context;
7455         chk->rec.data.doing_fast_retransmit = 0;
7456
7457         chk->rec.data.timetodrop = sp->ts;
7458         chk->flags = sp->act_flags;
7459
7460         if (sp->net) {
7461                 chk->whoTo = sp->net;
7462                 atomic_add_int(&chk->whoTo->ref_count, 1);
7463         } else
7464                 chk->whoTo = NULL;
7465
7466         if (sp->holds_key_ref) {
7467                 chk->auth_keyid = sp->auth_keyid;
7468                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7469                 chk->holds_key_ref = 1;
7470         }
7471         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7472         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7473                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7474                     (uintptr_t) stcb, sp->length,
7475                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7476                     chk->rec.data.TSN_seq);
7477         }
7478         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7479         /*
7480          * Put the rest of the things in place now. Size was done earlier in
7481          * previous loop prior to padding.
7482          */
7483
7484 #ifdef SCTP_ASOCLOG_OF_TSNS
7485         SCTP_TCB_LOCK_ASSERT(stcb);
7486         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7487                 asoc->tsn_out_at = 0;
7488                 asoc->tsn_out_wrapped = 1;
7489         }
7490         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7491         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7492         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7493         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7494         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7495         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7496         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7497         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7498         asoc->tsn_out_at++;
7499 #endif
7500
7501         dchkh->ch.chunk_type = SCTP_DATA;
7502         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7503         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7504         dchkh->dp.stream_id = htons(strq->stream_no);
7505         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7506         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7507         dchkh->ch.chunk_length = htons(chk->send_size);
7508         /* Now advance the chk->send_size by the actual pad needed. */
7509         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7510                 /* need a pad */
7511                 struct mbuf *lm;
7512                 int pads;
7513
7514                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7515                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7516                         chk->pad_inplace = 1;
7517                 }
7518                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7519                         /* pad added an mbuf */
7520                         chk->last_mbuf = lm;
7521                 }
7522                 chk->send_size += pads;
7523         }
7524         /* We only re-set the policy if it is on */
7525         if (sp->pr_sctp_on) {
7526                 sctp_set_prsctp_policy(sp);
7527                 asoc->pr_sctp_cnt++;
7528                 chk->pr_sctp_on = 1;
7529         } else {
7530                 chk->pr_sctp_on = 0;
7531         }
7532         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7533                 /* All done pull and kill the message */
7534                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7535                 if (sp->put_last_out == 0) {
7536                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7537                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7538                             sp->sender_all_done,
7539                             sp->length,
7540                             sp->msg_is_complete,
7541                             sp->put_last_out,
7542                             send_lock_up);
7543                 }
7544                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7545                         SCTP_TCB_SEND_LOCK(stcb);
7546                         send_lock_up = 1;
7547                 }
7548                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7549                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7550                 if (sp->net) {
7551                         sctp_free_remote_addr(sp->net);
7552                         sp->net = NULL;
7553                 }
7554                 if (sp->data) {
7555                         sctp_m_freem(sp->data);
7556                         sp->data = NULL;
7557                 }
7558                 sctp_free_a_strmoq(stcb, sp, so_locked);
7559
7560                 /* we can't be locked to it */
7561                 *locked = 0;
7562                 stcb->asoc.locked_on_sending = NULL;
7563         } else {
7564                 /* more to go, we are locked */
7565                 *locked = 1;
7566         }
7567         asoc->chunks_on_out_queue++;
7568         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7569         asoc->send_queue_cnt++;
7570 out_of:
7571         if (send_lock_up) {
7572                 SCTP_TCB_SEND_UNLOCK(stcb);
7573         }
7574         return (to_move);
7575 }
7576
7577
7578 static void
7579 sctp_fill_outqueue(struct sctp_tcb *stcb,
7580     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7581 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7582     SCTP_UNUSED
7583 #endif
7584 )
7585 {
7586         struct sctp_association *asoc;
7587         struct sctp_stream_out *strq;
7588         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7589         int locked, giveup;
7590
7591         SCTP_TCB_LOCK_ASSERT(stcb);
7592         asoc = &stcb->asoc;
7593         switch (net->ro._l_addr.sa.sa_family) {
7594 #ifdef INET
7595         case AF_INET:
7596                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7597                 break;
7598 #endif
7599 #ifdef INET6
7600         case AF_INET6:
7601                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7602                 break;
7603 #endif
7604         default:
7605                 /* TSNH */
7606                 goal_mtu = net->mtu;
7607                 break;
7608         }
7609         /* Need an allowance for the data chunk header too */
7610         goal_mtu -= sizeof(struct sctp_data_chunk);
7611
7612         /* must make even word boundary */
7613         goal_mtu &= 0xfffffffc;
7614         if (asoc->locked_on_sending) {
7615                 /* We are stuck on one stream until the message completes. */
7616                 strq = asoc->locked_on_sending;
7617                 locked = 1;
7618         } else {
7619                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7620                 locked = 0;
7621         }
7622         while ((goal_mtu > 0) && strq) {
7623                 giveup = 0;
7624                 bail = 0;
7625                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7626                     &giveup, eeor_mode, &bail, so_locked);
7627                 if (moved_how_much)
7628                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7629
7630                 if (locked) {
7631                         asoc->locked_on_sending = strq;
7632                         if ((moved_how_much == 0) || (giveup) || bail)
7633                                 /* no more to move for now */
7634                                 break;
7635                 } else {
7636                         asoc->locked_on_sending = NULL;
7637                         if ((giveup) || bail) {
7638                                 break;
7639                         }
7640                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7641                         if (strq == NULL) {
7642                                 break;
7643                         }
7644                 }
7645                 total_moved += moved_how_much;
7646                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7647                 goal_mtu &= 0xfffffffc;
7648         }
7649         if (bail)
7650                 *quit_now = 1;
7651
7652         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7653
7654         if (total_moved == 0) {
7655                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7656                     (net == stcb->asoc.primary_destination)) {
7657                         /* ran dry for primary network net */
7658                         SCTP_STAT_INCR(sctps_primary_randry);
7659                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7660                         /* ran dry with CMT on */
7661                         SCTP_STAT_INCR(sctps_cmt_randry);
7662                 }
7663         }
7664 }
7665
7666 void
7667 sctp_fix_ecn_echo(struct sctp_association *asoc)
7668 {
7669         struct sctp_tmit_chunk *chk;
7670
7671         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7672                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7673                         chk->sent = SCTP_DATAGRAM_UNSENT;
7674                 }
7675         }
7676 }
7677
7678 void
7679 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7680 {
7681         struct sctp_association *asoc;
7682         struct sctp_tmit_chunk *chk;
7683         struct sctp_stream_queue_pending *sp;
7684         unsigned int i;
7685
7686         if (net == NULL) {
7687                 return;
7688         }
7689         asoc = &stcb->asoc;
7690         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7691                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7692                         if (sp->net == net) {
7693                                 sctp_free_remote_addr(sp->net);
7694                                 sp->net = NULL;
7695                         }
7696                 }
7697         }
7698         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7699                 if (chk->whoTo == net) {
7700                         sctp_free_remote_addr(chk->whoTo);
7701                         chk->whoTo = NULL;
7702                 }
7703         }
7704 }
7705
7706 int
7707 sctp_med_chunk_output(struct sctp_inpcb *inp,
7708     struct sctp_tcb *stcb,
7709     struct sctp_association *asoc,
7710     int *num_out,
7711     int *reason_code,
7712     int control_only, int from_where,
7713     struct timeval *now, int *now_filled, int frag_point, int so_locked
7714 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7715     SCTP_UNUSED
7716 #endif
7717 )
7718 {
7719         /*
7720          * Ok this is the generic chunk service queue. we must do the
7721          * following: - Service the stream queue that is next, moving any
7722          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7723          * LAST to the out queue in one pass) and assigning TSN's - Check to
7724          * see if the cwnd/rwnd allows any output, if so we go ahead and
7725          * fomulate and send the low level chunks. Making sure to combine
7726          * any control in the control chunk queue also.
7727          */
7728         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7729         struct mbuf *outchain, *endoutchain;
7730         struct sctp_tmit_chunk *chk, *nchk;
7731
7732         /* temp arrays for unlinking */
7733         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7734         int no_fragmentflg, error;
7735         unsigned int max_rwnd_per_dest, max_send_per_dest;
7736         int one_chunk, hbflag, skip_data_for_this_net;
7737         int asconf, cookie, no_out_cnt;
7738         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7739         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7740         int tsns_sent = 0;
7741         uint32_t auth_offset = 0;
7742         struct sctp_auth_chunk *auth = NULL;
7743         uint16_t auth_keyid;
7744         int override_ok = 1;
7745         int skip_fill_up = 0;
7746         int data_auth_reqd = 0;
7747
7748         /*
7749          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7750          * destination.
7751          */
7752         int quit_now = 0;
7753
7754         *num_out = 0;
7755         auth_keyid = stcb->asoc.authinfo.active_keyid;
7756
7757         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7758             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7759             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7760                 eeor_mode = 1;
7761         } else {
7762                 eeor_mode = 0;
7763         }
7764         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7765         /*
7766          * First lets prime the pump. For each destination, if there is room
7767          * in the flight size, attempt to pull an MTU's worth out of the
7768          * stream queues into the general send_queue
7769          */
7770 #ifdef SCTP_AUDITING_ENABLED
7771         sctp_audit_log(0xC2, 2);
7772 #endif
7773         SCTP_TCB_LOCK_ASSERT(stcb);
7774         hbflag = 0;
7775         if ((control_only) || (asoc->stream_reset_outstanding))
7776                 no_data_chunks = 1;
7777         else
7778                 no_data_chunks = 0;
7779
7780         /* Nothing to possible to send? */
7781         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7782             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7783             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7784             TAILQ_EMPTY(&asoc->send_queue) &&
7785             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7786 nothing_to_send:
7787                 *reason_code = 9;
7788                 return (0);
7789         }
7790         if (asoc->peers_rwnd == 0) {
7791                 /* No room in peers rwnd */
7792                 *reason_code = 1;
7793                 if (asoc->total_flight > 0) {
7794                         /* we are allowed one chunk in flight */
7795                         no_data_chunks = 1;
7796                 }
7797         }
7798         if (stcb->asoc.ecn_echo_cnt_onq) {
7799                 /* Record where a sack goes, if any */
7800                 if (no_data_chunks &&
7801                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7802                         /* Nothing but ECNe to send - we don't do that */
7803                         goto nothing_to_send;
7804                 }
7805                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7806                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7807                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7808                                 sack_goes_to = chk->whoTo;
7809                                 break;
7810                         }
7811                 }
7812         }
7813         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7814         if (stcb->sctp_socket)
7815                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7816         else
7817                 max_send_per_dest = 0;
7818         if (no_data_chunks == 0) {
7819                 /* How many non-directed chunks are there? */
7820                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7821                         if (chk->whoTo == NULL) {
7822                                 /*
7823                                  * We already have non-directed chunks on
7824                                  * the queue, no need to do a fill-up.
7825                                  */
7826                                 skip_fill_up = 1;
7827                                 break;
7828                         }
7829                 }
7830
7831         }
7832         if ((no_data_chunks == 0) &&
7833             (skip_fill_up == 0) &&
7834             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7835                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7836                         /*
7837                          * This for loop we are in takes in each net, if
7838                          * its's got space in cwnd and has data sent to it
7839                          * (when CMT is off) then it calls
7840                          * sctp_fill_outqueue for the net. This gets data on
7841                          * the send queue for that network.
7842                          *
7843                          * In sctp_fill_outqueue TSN's are assigned and data is
7844                          * copied out of the stream buffers. Note mostly
7845                          * copy by reference (we hope).
7846                          */
7847                         net->window_probe = 0;
7848                         if ((net != stcb->asoc.alternate) &&
7849                             ((net->dest_state & SCTP_ADDR_PF) ||
7850                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7851                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7852                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7853                                         sctp_log_cwnd(stcb, net, 1,
7854                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7855                                 }
7856                                 continue;
7857                         }
7858                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7859                             (net->flight_size == 0)) {
7860                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7861                         }
7862                         if (net->flight_size >= net->cwnd) {
7863                                 /* skip this network, no room - can't fill */
7864                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7865                                         sctp_log_cwnd(stcb, net, 3,
7866                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7867                                 }
7868                                 continue;
7869                         }
7870                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7871                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7872                         }
7873                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7874                         if (quit_now) {
7875                                 /* memory alloc failure */
7876                                 no_data_chunks = 1;
7877                                 break;
7878                         }
7879                 }
7880         }
7881         /* now service each destination and send out what we can for it */
7882         /* Nothing to send? */
7883         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7884             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7885             TAILQ_EMPTY(&asoc->send_queue)) {
7886                 *reason_code = 8;
7887                 return (0);
7888         }
7889         if (asoc->sctp_cmt_on_off > 0) {
7890                 /* get the last start point */
7891                 start_at = asoc->last_net_cmt_send_started;
7892                 if (start_at == NULL) {
7893                         /* null so to beginning */
7894                         start_at = TAILQ_FIRST(&asoc->nets);
7895                 } else {
7896                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7897                         if (start_at == NULL) {
7898                                 start_at = TAILQ_FIRST(&asoc->nets);
7899                         }
7900                 }
7901                 asoc->last_net_cmt_send_started = start_at;
7902         } else {
7903                 start_at = TAILQ_FIRST(&asoc->nets);
7904         }
7905         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7906                 if (chk->whoTo == NULL) {
7907                         if (asoc->alternate) {
7908                                 chk->whoTo = asoc->alternate;
7909                         } else {
7910                                 chk->whoTo = asoc->primary_destination;
7911                         }
7912                         atomic_add_int(&chk->whoTo->ref_count, 1);
7913                 }
7914         }
7915         old_start_at = NULL;
7916 again_one_more_time:
7917         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7918                 /* how much can we send? */
7919                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7920                 if (old_start_at && (old_start_at == net)) {
7921                         /* through list ocmpletely. */
7922                         break;
7923                 }
7924                 tsns_sent = 0xa;
7925                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7926                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7927                     (net->flight_size >= net->cwnd)) {
7928                         /*
7929                          * Nothing on control or asconf and flight is full,
7930                          * we can skip even in the CMT case.
7931                          */
7932                         continue;
7933                 }
7934                 bundle_at = 0;
7935                 endoutchain = outchain = NULL;
7936                 no_fragmentflg = 1;
7937                 one_chunk = 0;
7938                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7939                         skip_data_for_this_net = 1;
7940                 } else {
7941                         skip_data_for_this_net = 0;
7942                 }
7943                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7944                         /*
7945                          * if we have a route and an ifp check to see if we
7946                          * have room to send to this guy
7947                          */
7948                         struct ifnet *ifp;
7949
7950                         ifp = net->ro.ro_rt->rt_ifp;
7951                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7952                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7953                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7954                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7955                                 }
7956                                 continue;
7957                         }
7958                 }
7959                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7960 #ifdef INET
7961                 case AF_INET:
7962                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7963                         break;
7964 #endif
7965 #ifdef INET6
7966                 case AF_INET6:
7967                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7968                         break;
7969 #endif
7970                 default:
7971                         /* TSNH */
7972                         mtu = net->mtu;
7973                         break;
7974                 }
7975                 mx_mtu = mtu;
7976                 to_out = 0;
7977                 if (mtu > asoc->peers_rwnd) {
7978                         if (asoc->total_flight > 0) {
7979                                 /* We have a packet in flight somewhere */
7980                                 r_mtu = asoc->peers_rwnd;
7981                         } else {
7982                                 /* We are always allowed to send one MTU out */
7983                                 one_chunk = 1;
7984                                 r_mtu = mtu;
7985                         }
7986                 } else {
7987                         r_mtu = mtu;
7988                 }
7989                 /************************/
7990                 /* ASCONF transmission */
7991                 /************************/
7992                 /* Now first lets go through the asconf queue */
7993                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7994                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7995                                 continue;
7996                         }
7997                         if (chk->whoTo == NULL) {
7998                                 if (asoc->alternate == NULL) {
7999                                         if (asoc->primary_destination != net) {
8000                                                 break;
8001                                         }
8002                                 } else {
8003                                         if (asoc->alternate != net) {
8004                                                 break;
8005                                         }
8006                                 }
8007                         } else {
8008                                 if (chk->whoTo != net) {
8009                                         break;
8010                                 }
8011                         }
8012                         if (chk->data == NULL) {
8013                                 break;
8014                         }
8015                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8016                             chk->sent != SCTP_DATAGRAM_RESEND) {
8017                                 break;
8018                         }
8019                         /*
8020                          * if no AUTH is yet included and this chunk
8021                          * requires it, make sure to account for it.  We
8022                          * don't apply the size until the AUTH chunk is
8023                          * actually added below in case there is no room for
8024                          * this chunk. NOTE: we overload the use of "omtu"
8025                          * here
8026                          */
8027                         if ((auth == NULL) &&
8028                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8029                             stcb->asoc.peer_auth_chunks)) {
8030                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8031                         } else
8032                                 omtu = 0;
8033                         /* Here we do NOT factor the r_mtu */
8034                         if ((chk->send_size < (int)(mtu - omtu)) ||
8035                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8036                                 /*
8037                                  * We probably should glom the mbuf chain
8038                                  * from the chk->data for control but the
8039                                  * problem is it becomes yet one more level
8040                                  * of tracking to do if for some reason
8041                                  * output fails. Then I have got to
8042                                  * reconstruct the merged control chain.. el
8043                                  * yucko.. for now we take the easy way and
8044                                  * do the copy
8045                                  */
8046                                 /*
8047                                  * Add an AUTH chunk, if chunk requires it
8048                                  * save the offset into the chain for AUTH
8049                                  */
8050                                 if ((auth == NULL) &&
8051                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8052                                     stcb->asoc.peer_auth_chunks))) {
8053                                         outchain = sctp_add_auth_chunk(outchain,
8054                                             &endoutchain,
8055                                             &auth,
8056                                             &auth_offset,
8057                                             stcb,
8058                                             chk->rec.chunk_id.id);
8059                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8060                                 }
8061                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8062                                     (int)chk->rec.chunk_id.can_take_data,
8063                                     chk->send_size, chk->copy_by_ref);
8064                                 if (outchain == NULL) {
8065                                         *reason_code = 8;
8066                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8067                                         return (ENOMEM);
8068                                 }
8069                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8070                                 /* update our MTU size */
8071                                 if (mtu > (chk->send_size + omtu))
8072                                         mtu -= (chk->send_size + omtu);
8073                                 else
8074                                         mtu = 0;
8075                                 to_out += (chk->send_size + omtu);
8076                                 /* Do clear IP_DF ? */
8077                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8078                                         no_fragmentflg = 0;
8079                                 }
8080                                 if (chk->rec.chunk_id.can_take_data)
8081                                         chk->data = NULL;
8082                                 /*
8083                                  * set hb flag since we can use these for
8084                                  * RTO
8085                                  */
8086                                 hbflag = 1;
8087                                 asconf = 1;
8088                                 /*
8089                                  * should sysctl this: don't bundle data
8090                                  * with ASCONF since it requires AUTH
8091                                  */
8092                                 no_data_chunks = 1;
8093                                 chk->sent = SCTP_DATAGRAM_SENT;
8094                                 if (chk->whoTo == NULL) {
8095                                         chk->whoTo = net;
8096                                         atomic_add_int(&net->ref_count, 1);
8097                                 }
8098                                 chk->snd_count++;
8099                                 if (mtu == 0) {
8100                                         /*
8101                                          * Ok we are out of room but we can
8102                                          * output without effecting the
8103                                          * flight size since this little guy
8104                                          * is a control only packet.
8105                                          */
8106                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8107                                         /*
8108                                          * do NOT clear the asconf flag as
8109                                          * it is used to do appropriate
8110                                          * source address selection.
8111                                          */
8112                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8113                                             (struct sockaddr *)&net->ro._l_addr,
8114                                             outchain, auth_offset, auth,
8115                                             stcb->asoc.authinfo.active_keyid,
8116                                             no_fragmentflg, 0, asconf,
8117                                             inp->sctp_lport, stcb->rport,
8118                                             htonl(stcb->asoc.peer_vtag),
8119                                             net->port, so_locked, NULL, NULL))) {
8120                                                 if (error == ENOBUFS) {
8121                                                         asoc->ifp_had_enobuf = 1;
8122                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8123                                                 }
8124                                                 if (from_where == 0) {
8125                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8126                                                 }
8127                                                 if (*now_filled == 0) {
8128                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8129                                                         *now_filled = 1;
8130                                                         *now = net->last_sent_time;
8131                                                 } else {
8132                                                         net->last_sent_time = *now;
8133                                                 }
8134                                                 hbflag = 0;
8135                                                 /* error, could not output */
8136                                                 if (error == EHOSTUNREACH) {
8137                                                         /*
8138                                                          * Destination went
8139                                                          * unreachable
8140                                                          * during this send
8141                                                          */
8142                                                         sctp_move_chunks_from_net(stcb, net);
8143                                                 }
8144                                                 *reason_code = 7;
8145                                                 continue;
8146                                         } else
8147                                                 asoc->ifp_had_enobuf = 0;
8148                                         if (*now_filled == 0) {
8149                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8150                                                 *now_filled = 1;
8151                                                 *now = net->last_sent_time;
8152                                         } else {
8153                                                 net->last_sent_time = *now;
8154                                         }
8155                                         hbflag = 0;
8156                                         /*
8157                                          * increase the number we sent, if a
8158                                          * cookie is sent we don't tell them
8159                                          * any was sent out.
8160                                          */
8161                                         outchain = endoutchain = NULL;
8162                                         auth = NULL;
8163                                         auth_offset = 0;
8164                                         if (!no_out_cnt)
8165                                                 *num_out += ctl_cnt;
8166                                         /* recalc a clean slate and setup */
8167                                         switch (net->ro._l_addr.sa.sa_family) {
8168 #ifdef INET
8169                                         case AF_INET:
8170                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8171                                                 break;
8172 #endif
8173 #ifdef INET6
8174                                         case AF_INET6:
8175                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8176                                                 break;
8177 #endif
8178                                         default:
8179                                                 /* TSNH */
8180                                                 mtu = net->mtu;
8181                                                 break;
8182                                         }
8183                                         to_out = 0;
8184                                         no_fragmentflg = 1;
8185                                 }
8186                         }
8187                 }
8188                 /************************/
8189                 /* Control transmission */
8190                 /************************/
8191                 /* Now first lets go through the control queue */
8192                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8193                         if ((sack_goes_to) &&
8194                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8195                             (chk->whoTo != sack_goes_to)) {
8196                                 /*
8197                                  * if we have a sack in queue, and we are
8198                                  * looking at an ecn echo that is NOT queued
8199                                  * to where the sack is going..
8200                                  */
8201                                 if (chk->whoTo == net) {
8202                                         /*
8203                                          * Don't transmit it to where its
8204                                          * going (current net)
8205                                          */
8206                                         continue;
8207                                 } else if (sack_goes_to == net) {
8208                                         /*
8209                                          * But do transmit it to this
8210                                          * address
8211                                          */
8212                                         goto skip_net_check;
8213                                 }
8214                         }
8215                         if (chk->whoTo == NULL) {
8216                                 if (asoc->alternate == NULL) {
8217                                         if (asoc->primary_destination != net) {
8218                                                 continue;
8219                                         }
8220                                 } else {
8221                                         if (asoc->alternate != net) {
8222                                                 continue;
8223                                         }
8224                                 }
8225                         } else {
8226                                 if (chk->whoTo != net) {
8227                                         continue;
8228                                 }
8229                         }
8230         skip_net_check:
8231                         if (chk->data == NULL) {
8232                                 continue;
8233                         }
8234                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8235                                 /*
8236                                  * It must be unsent. Cookies and ASCONF's
8237                                  * hang around but there timers will force
8238                                  * when marked for resend.
8239                                  */
8240                                 continue;
8241                         }
8242                         /*
8243                          * if no AUTH is yet included and this chunk
8244                          * requires it, make sure to account for it.  We
8245                          * don't apply the size until the AUTH chunk is
8246                          * actually added below in case there is no room for
8247                          * this chunk. NOTE: we overload the use of "omtu"
8248                          * here
8249                          */
8250                         if ((auth == NULL) &&
8251                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8252                             stcb->asoc.peer_auth_chunks)) {
8253                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8254                         } else
8255                                 omtu = 0;
8256                         /* Here we do NOT factor the r_mtu */
8257                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8258                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8259                                 /*
8260                                  * We probably should glom the mbuf chain
8261                                  * from the chk->data for control but the
8262                                  * problem is it becomes yet one more level
8263                                  * of tracking to do if for some reason
8264                                  * output fails. Then I have got to
8265                                  * reconstruct the merged control chain.. el
8266                                  * yucko.. for now we take the easy way and
8267                                  * do the copy
8268                                  */
8269                                 /*
8270                                  * Add an AUTH chunk, if chunk requires it
8271                                  * save the offset into the chain for AUTH
8272                                  */
8273                                 if ((auth == NULL) &&
8274                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8275                                     stcb->asoc.peer_auth_chunks))) {
8276                                         outchain = sctp_add_auth_chunk(outchain,
8277                                             &endoutchain,
8278                                             &auth,
8279                                             &auth_offset,
8280                                             stcb,
8281                                             chk->rec.chunk_id.id);
8282                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8283                                 }
8284                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8285                                     (int)chk->rec.chunk_id.can_take_data,
8286                                     chk->send_size, chk->copy_by_ref);
8287                                 if (outchain == NULL) {
8288                                         *reason_code = 8;
8289                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8290                                         return (ENOMEM);
8291                                 }
8292                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8293                                 /* update our MTU size */
8294                                 if (mtu > (chk->send_size + omtu))
8295                                         mtu -= (chk->send_size + omtu);
8296                                 else
8297                                         mtu = 0;
8298                                 to_out += (chk->send_size + omtu);
8299                                 /* Do clear IP_DF ? */
8300                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8301                                         no_fragmentflg = 0;
8302                                 }
8303                                 if (chk->rec.chunk_id.can_take_data)
8304                                         chk->data = NULL;
8305                                 /* Mark things to be removed, if needed */
8306                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8307                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8308                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8309                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8310                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8311                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8312                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8313                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8314                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8315                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8316                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8317                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8318                                                 hbflag = 1;
8319                                         }
8320                                         /* remove these chunks at the end */
8321                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8322                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8323                                                 /* turn off the timer */
8324                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8325                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8326                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8327                                                 }
8328                                         }
8329                                         ctl_cnt++;
8330                                 } else {
8331                                         /*
8332                                          * Other chunks, since they have
8333                                          * timers running (i.e. COOKIE) we
8334                                          * just "trust" that it gets sent or
8335                                          * retransmitted.
8336                                          */
8337                                         ctl_cnt++;
8338                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8339                                                 cookie = 1;
8340                                                 no_out_cnt = 1;
8341                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8342                                                 /*
8343                                                  * Increment ecne send count
8344                                                  * here this means we may be
8345                                                  * over-zealous in our
8346                                                  * counting if the send
8347                                                  * fails, but its the best
8348                                                  * place to do it (we used
8349                                                  * to do it in the queue of
8350                                                  * the chunk, but that did
8351                                                  * not tell how many times
8352                                                  * it was sent.
8353                                                  */
8354                                                 SCTP_STAT_INCR(sctps_sendecne);
8355                                         }
8356                                         chk->sent = SCTP_DATAGRAM_SENT;
8357                                         if (chk->whoTo == NULL) {
8358                                                 chk->whoTo = net;
8359                                                 atomic_add_int(&net->ref_count, 1);
8360                                         }
8361                                         chk->snd_count++;
8362                                 }
8363                                 if (mtu == 0) {
8364                                         /*
8365                                          * Ok we are out of room but we can
8366                                          * output without effecting the
8367                                          * flight size since this little guy
8368                                          * is a control only packet.
8369                                          */
8370                                         if (asconf) {
8371                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8372                                                 /*
8373                                                  * do NOT clear the asconf
8374                                                  * flag as it is used to do
8375                                                  * appropriate source
8376                                                  * address selection.
8377                                                  */
8378                                         }
8379                                         if (cookie) {
8380                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8381                                                 cookie = 0;
8382                                         }
8383                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8384                                             (struct sockaddr *)&net->ro._l_addr,
8385                                             outchain,
8386                                             auth_offset, auth,
8387                                             stcb->asoc.authinfo.active_keyid,
8388                                             no_fragmentflg, 0, asconf,
8389                                             inp->sctp_lport, stcb->rport,
8390                                             htonl(stcb->asoc.peer_vtag),
8391                                             net->port, so_locked, NULL, NULL))) {
8392                                                 if (error == ENOBUFS) {
8393                                                         asoc->ifp_had_enobuf = 1;
8394                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8395                                                 }
8396                                                 if (from_where == 0) {
8397                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8398                                                 }
8399                                                 /* error, could not output */
8400                                                 if (hbflag) {
8401                                                         if (*now_filled == 0) {
8402                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8403                                                                 *now_filled = 1;
8404                                                                 *now = net->last_sent_time;
8405                                                         } else {
8406                                                                 net->last_sent_time = *now;
8407                                                         }
8408                                                         hbflag = 0;
8409                                                 }
8410                                                 if (error == EHOSTUNREACH) {
8411                                                         /*
8412                                                          * Destination went
8413                                                          * unreachable
8414                                                          * during this send
8415                                                          */
8416                                                         sctp_move_chunks_from_net(stcb, net);
8417                                                 }
8418                                                 *reason_code = 7;
8419                                                 continue;
8420                                         } else
8421                                                 asoc->ifp_had_enobuf = 0;
8422                                         /* Only HB or ASCONF advances time */
8423                                         if (hbflag) {
8424                                                 if (*now_filled == 0) {
8425                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8426                                                         *now_filled = 1;
8427                                                         *now = net->last_sent_time;
8428                                                 } else {
8429                                                         net->last_sent_time = *now;
8430                                                 }
8431                                                 hbflag = 0;
8432                                         }
8433                                         /*
8434                                          * increase the number we sent, if a
8435                                          * cookie is sent we don't tell them
8436                                          * any was sent out.
8437                                          */
8438                                         outchain = endoutchain = NULL;
8439                                         auth = NULL;
8440                                         auth_offset = 0;
8441                                         if (!no_out_cnt)
8442                                                 *num_out += ctl_cnt;
8443                                         /* recalc a clean slate and setup */
8444                                         switch (net->ro._l_addr.sa.sa_family) {
8445 #ifdef INET
8446                                         case AF_INET:
8447                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8448                                                 break;
8449 #endif
8450 #ifdef INET6
8451                                         case AF_INET6:
8452                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8453                                                 break;
8454 #endif
8455                                         default:
8456                                                 /* TSNH */
8457                                                 mtu = net->mtu;
8458                                                 break;
8459                                         }
8460                                         to_out = 0;
8461                                         no_fragmentflg = 1;
8462                                 }
8463                         }
8464                 }
8465                 /* JRI: if dest is in PF state, do not send data to it */
8466                 if ((asoc->sctp_cmt_on_off > 0) &&
8467                     (net != stcb->asoc.alternate) &&
8468                     (net->dest_state & SCTP_ADDR_PF)) {
8469                         goto no_data_fill;
8470                 }
8471                 if (net->flight_size >= net->cwnd) {
8472                         goto no_data_fill;
8473                 }
8474                 if ((asoc->sctp_cmt_on_off > 0) &&
8475                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8476                     (net->flight_size > max_rwnd_per_dest)) {
8477                         goto no_data_fill;
8478                 }
8479                 /*
8480                  * We need a specific accounting for the usage of the send
8481                  * buffer. We also need to check the number of messages per
8482                  * net. For now, this is better than nothing and it disabled
8483                  * by default...
8484                  */
8485                 if ((asoc->sctp_cmt_on_off > 0) &&
8486                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8487                     (max_send_per_dest > 0) &&
8488                     (net->flight_size > max_send_per_dest)) {
8489                         goto no_data_fill;
8490                 }
8491                 /*********************/
8492                 /* Data transmission */
8493                 /*********************/
8494                 /*
8495                  * if AUTH for DATA is required and no AUTH has been added
8496                  * yet, account for this in the mtu now... if no data can be
8497                  * bundled, this adjustment won't matter anyways since the
8498                  * packet will be going out...
8499                  */
8500                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8501                     stcb->asoc.peer_auth_chunks);
8502                 if (data_auth_reqd && (auth == NULL)) {
8503                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8504                 }
8505                 /* now lets add any data within the MTU constraints */
8506                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8507                 case AF_INET:
8508                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8509                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8510                         else
8511                                 omtu = 0;
8512                         break;
8513 #ifdef INET6
8514                 case AF_INET6:
8515                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8516                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8517                         else
8518                                 omtu = 0;
8519                         break;
8520 #endif
8521                 default:
8522                         /* TSNH */
8523                         omtu = 0;
8524                         break;
8525                 }
8526                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8527                     (skip_data_for_this_net == 0)) ||
8528                     (cookie)) {
8529                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8530                                 if (no_data_chunks) {
8531                                         /* let only control go out */
8532                                         *reason_code = 1;
8533                                         break;
8534                                 }
8535                                 if (net->flight_size >= net->cwnd) {
8536                                         /* skip this net, no room for data */
8537                                         *reason_code = 2;
8538                                         break;
8539                                 }
8540                                 if ((chk->whoTo != NULL) &&
8541                                     (chk->whoTo != net)) {
8542                                         /* Don't send the chunk on this net */
8543                                         continue;
8544                                 }
8545                                 if (asoc->sctp_cmt_on_off == 0) {
8546                                         if ((asoc->alternate) &&
8547                                             (asoc->alternate != net) &&
8548                                             (chk->whoTo == NULL)) {
8549                                                 continue;
8550                                         } else if ((net != asoc->primary_destination) &&
8551                                                     (asoc->alternate == NULL) &&
8552                                             (chk->whoTo == NULL)) {
8553                                                 continue;
8554                                         }
8555                                 }
8556                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8557                                         /*-
8558                                          * strange, we have a chunk that is
8559                                          * to big for its destination and
8560                                          * yet no fragment ok flag.
8561                                          * Something went wrong when the
8562                                          * PMTU changed...we did not mark
8563                                          * this chunk for some reason?? I
8564                                          * will fix it here by letting IP
8565                                          * fragment it for now and printing
8566                                          * a warning. This really should not
8567                                          * happen ...
8568                                          */
8569                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8570                                             chk->send_size, mtu);
8571                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8572                                 }
8573                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8574                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8575                                         struct sctp_data_chunk *dchkh;
8576
8577                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8578                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8579                                 }
8580                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8581                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8582                                         /* ok we will add this one */
8583
8584                                         /*
8585                                          * Add an AUTH chunk, if chunk
8586                                          * requires it, save the offset into
8587                                          * the chain for AUTH
8588                                          */
8589                                         if (data_auth_reqd) {
8590                                                 if (auth == NULL) {
8591                                                         outchain = sctp_add_auth_chunk(outchain,
8592                                                             &endoutchain,
8593                                                             &auth,
8594                                                             &auth_offset,
8595                                                             stcb,
8596                                                             SCTP_DATA);
8597                                                         auth_keyid = chk->auth_keyid;
8598                                                         override_ok = 0;
8599                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8600                                                 } else if (override_ok) {
8601                                                         /*
8602                                                          * use this data's
8603                                                          * keyid
8604                                                          */
8605                                                         auth_keyid = chk->auth_keyid;
8606                                                         override_ok = 0;
8607                                                 } else if (auth_keyid != chk->auth_keyid) {
8608                                                         /*
8609                                                          * different keyid,
8610                                                          * so done bundling
8611                                                          */
8612                                                         break;
8613                                                 }
8614                                         }
8615                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8616                                             chk->send_size, chk->copy_by_ref);
8617                                         if (outchain == NULL) {
8618                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8619                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8620                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8621                                                 }
8622                                                 *reason_code = 3;
8623                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8624                                                 return (ENOMEM);
8625                                         }
8626                                         /* upate our MTU size */
8627                                         /* Do clear IP_DF ? */
8628                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8629                                                 no_fragmentflg = 0;
8630                                         }
8631                                         /* unsigned subtraction of mtu */
8632                                         if (mtu > chk->send_size)
8633                                                 mtu -= chk->send_size;
8634                                         else
8635                                                 mtu = 0;
8636                                         /* unsigned subtraction of r_mtu */
8637                                         if (r_mtu > chk->send_size)
8638                                                 r_mtu -= chk->send_size;
8639                                         else
8640                                                 r_mtu = 0;
8641
8642                                         to_out += chk->send_size;
8643                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8644 #ifdef INVARIANTS
8645                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8646 #else
8647                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8648                                                     mx_mtu, to_out);
8649 #endif
8650                                         }
8651                                         chk->window_probe = 0;
8652                                         data_list[bundle_at++] = chk;
8653                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8654                                                 break;
8655                                         }
8656                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8657                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8658                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8659                                                 } else {
8660                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8661                                                 }
8662                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8663                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8664                                                         /*
8665                                                          * Count number of
8666                                                          * user msg's that
8667                                                          * were fragmented
8668                                                          * we do this by
8669                                                          * counting when we
8670                                                          * see a LAST
8671                                                          * fragment only.
8672                                                          */
8673                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8674                                         }
8675                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8676                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8677                                                         data_list[0]->window_probe = 1;
8678                                                         net->window_probe = 1;
8679                                                 }
8680                                                 break;
8681                                         }
8682                                 } else {
8683                                         /*
8684                                          * Must be sent in order of the
8685                                          * TSN's (on a network)
8686                                          */
8687                                         break;
8688                                 }
8689                         }       /* for (chunk gather loop for this net) */
8690                 }               /* if asoc.state OPEN */
8691 no_data_fill:
8692                 /* Is there something to send for this destination? */
8693                 if (outchain) {
8694                         /* We may need to start a control timer or two */
8695                         if (asconf) {
8696                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8697                                     stcb, net);
8698                                 /*
8699                                  * do NOT clear the asconf flag as it is
8700                                  * used to do appropriate source address
8701                                  * selection.
8702                                  */
8703                         }
8704                         if (cookie) {
8705                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8706                                 cookie = 0;
8707                         }
8708                         /* must start a send timer if data is being sent */
8709                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8710                                 /*
8711                                  * no timer running on this destination
8712                                  * restart it.
8713                                  */
8714                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8715                         }
8716                         /* Now send it, if there is anything to send :> */
8717                         if ((error = sctp_lowlevel_chunk_output(inp,
8718                             stcb,
8719                             net,
8720                             (struct sockaddr *)&net->ro._l_addr,
8721                             outchain,
8722                             auth_offset,
8723                             auth,
8724                             auth_keyid,
8725                             no_fragmentflg,
8726                             bundle_at,
8727                             asconf,
8728                             inp->sctp_lport, stcb->rport,
8729                             htonl(stcb->asoc.peer_vtag),
8730                             net->port, so_locked, NULL, NULL))) {
8731                                 /* error, we could not output */
8732                                 if (error == ENOBUFS) {
8733                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8734                                         asoc->ifp_had_enobuf = 1;
8735                                 }
8736                                 if (from_where == 0) {
8737                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8738                                 }
8739                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8740                                 if (hbflag) {
8741                                         if (*now_filled == 0) {
8742                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8743                                                 *now_filled = 1;
8744                                                 *now = net->last_sent_time;
8745                                         } else {
8746                                                 net->last_sent_time = *now;
8747                                         }
8748                                         hbflag = 0;
8749                                 }
8750                                 if (error == EHOSTUNREACH) {
8751                                         /*
8752                                          * Destination went unreachable
8753                                          * during this send
8754                                          */
8755                                         sctp_move_chunks_from_net(stcb, net);
8756                                 }
8757                                 *reason_code = 6;
8758                                 /*-
8759                                  * I add this line to be paranoid. As far as
8760                                  * I can tell the continue, takes us back to
8761                                  * the top of the for, but just to make sure
8762                                  * I will reset these again here.
8763                                  */
8764                                 ctl_cnt = bundle_at = 0;
8765                                 continue;       /* This takes us back to the
8766                                                  * for() for the nets. */
8767                         } else {
8768                                 asoc->ifp_had_enobuf = 0;
8769                         }
8770                         endoutchain = NULL;
8771                         auth = NULL;
8772                         auth_offset = 0;
8773                         if (bundle_at || hbflag) {
8774                                 /* For data/asconf and hb set time */
8775                                 if (*now_filled == 0) {
8776                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8777                                         *now_filled = 1;
8778                                         *now = net->last_sent_time;
8779                                 } else {
8780                                         net->last_sent_time = *now;
8781                                 }
8782                         }
8783                         if (!no_out_cnt) {
8784                                 *num_out += (ctl_cnt + bundle_at);
8785                         }
8786                         if (bundle_at) {
8787                                 /* setup for a RTO measurement */
8788                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8789                                 /* fill time if not already filled */
8790                                 if (*now_filled == 0) {
8791                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8792                                         *now_filled = 1;
8793                                         *now = asoc->time_last_sent;
8794                                 } else {
8795                                         asoc->time_last_sent = *now;
8796                                 }
8797                                 if (net->rto_needed) {
8798                                         data_list[0]->do_rtt = 1;
8799                                         net->rto_needed = 0;
8800                                 }
8801                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8802                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8803                         }
8804                         if (one_chunk) {
8805                                 break;
8806                         }
8807                 }
8808                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8809                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8810                 }
8811         }
8812         if (old_start_at == NULL) {
8813                 old_start_at = start_at;
8814                 start_at = TAILQ_FIRST(&asoc->nets);
8815                 if (old_start_at)
8816                         goto again_one_more_time;
8817         }
8818         /*
8819          * At the end there should be no NON timed chunks hanging on this
8820          * queue.
8821          */
8822         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8823                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8824         }
8825         if ((*num_out == 0) && (*reason_code == 0)) {
8826                 *reason_code = 4;
8827         } else {
8828                 *reason_code = 5;
8829         }
8830         sctp_clean_up_ctl(stcb, asoc, so_locked);
8831         return (0);
8832 }
8833
8834 void
8835 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8836 {
8837         /*-
8838          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8839          * the control chunk queue.
8840          */
8841         struct sctp_chunkhdr *hdr;
8842         struct sctp_tmit_chunk *chk;
8843         struct mbuf *mat;
8844
8845         SCTP_TCB_LOCK_ASSERT(stcb);
8846         sctp_alloc_a_chunk(stcb, chk);
8847         if (chk == NULL) {
8848                 /* no memory */
8849                 sctp_m_freem(op_err);
8850                 return;
8851         }
8852         chk->copy_by_ref = 0;
8853         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8854         if (op_err == NULL) {
8855                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8856                 return;
8857         }
8858         chk->send_size = 0;
8859         mat = op_err;
8860         while (mat != NULL) {
8861                 chk->send_size += SCTP_BUF_LEN(mat);
8862                 mat = SCTP_BUF_NEXT(mat);
8863         }
8864         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8865         chk->rec.chunk_id.can_take_data = 1;
8866         chk->sent = SCTP_DATAGRAM_UNSENT;
8867         chk->snd_count = 0;
8868         chk->flags = 0;
8869         chk->asoc = &stcb->asoc;
8870         chk->data = op_err;
8871         chk->whoTo = NULL;
8872         hdr = mtod(op_err, struct sctp_chunkhdr *);
8873         hdr->chunk_type = SCTP_OPERATION_ERROR;
8874         hdr->chunk_flags = 0;
8875         hdr->chunk_length = htons(chk->send_size);
8876         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8877             chk,
8878             sctp_next);
8879         chk->asoc->ctrl_queue_cnt++;
8880 }
8881
8882 int
8883 sctp_send_cookie_echo(struct mbuf *m,
8884     int offset,
8885     struct sctp_tcb *stcb,
8886     struct sctp_nets *net)
8887 {
8888         /*-
8889          * pull out the cookie and put it at the front of the control chunk
8890          * queue.
8891          */
8892         int at;
8893         struct mbuf *cookie;
8894         struct sctp_paramhdr parm, *phdr;
8895         struct sctp_chunkhdr *hdr;
8896         struct sctp_tmit_chunk *chk;
8897         uint16_t ptype, plen;
8898
8899         /* First find the cookie in the param area */
8900         cookie = NULL;
8901         at = offset + sizeof(struct sctp_init_chunk);
8902
8903         SCTP_TCB_LOCK_ASSERT(stcb);
8904         do {
8905                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8906                 if (phdr == NULL) {
8907                         return (-3);
8908                 }
8909                 ptype = ntohs(phdr->param_type);
8910                 plen = ntohs(phdr->param_length);
8911                 if (ptype == SCTP_STATE_COOKIE) {
8912                         int pad;
8913
8914                         /* found the cookie */
8915                         if ((pad = (plen % 4))) {
8916                                 plen += 4 - pad;
8917                         }
8918                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8919                         if (cookie == NULL) {
8920                                 /* No memory */
8921                                 return (-2);
8922                         }
8923 #ifdef SCTP_MBUF_LOGGING
8924                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8925                                 struct mbuf *mat;
8926
8927                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8928                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8929                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8930                                         }
8931                                 }
8932                         }
8933 #endif
8934                         break;
8935                 }
8936                 at += SCTP_SIZE32(plen);
8937         } while (phdr);
8938         if (cookie == NULL) {
8939                 /* Did not find the cookie */
8940                 return (-3);
8941         }
8942         /* ok, we got the cookie lets change it into a cookie echo chunk */
8943
8944         /* first the change from param to cookie */
8945         hdr = mtod(cookie, struct sctp_chunkhdr *);
8946         hdr->chunk_type = SCTP_COOKIE_ECHO;
8947         hdr->chunk_flags = 0;
8948         /* get the chunk stuff now and place it in the FRONT of the queue */
8949         sctp_alloc_a_chunk(stcb, chk);
8950         if (chk == NULL) {
8951                 /* no memory */
8952                 sctp_m_freem(cookie);
8953                 return (-5);
8954         }
8955         chk->copy_by_ref = 0;
8956         chk->send_size = plen;
8957         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8958         chk->rec.chunk_id.can_take_data = 0;
8959         chk->sent = SCTP_DATAGRAM_UNSENT;
8960         chk->snd_count = 0;
8961         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8962         chk->asoc = &stcb->asoc;
8963         chk->data = cookie;
8964         chk->whoTo = net;
8965         atomic_add_int(&chk->whoTo->ref_count, 1);
8966         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8967         chk->asoc->ctrl_queue_cnt++;
8968         return (0);
8969 }
8970
8971 void
8972 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8973     struct mbuf *m,
8974     int offset,
8975     int chk_length,
8976     struct sctp_nets *net)
8977 {
8978         /*
8979          * take a HB request and make it into a HB ack and send it.
8980          */
8981         struct mbuf *outchain;
8982         struct sctp_chunkhdr *chdr;
8983         struct sctp_tmit_chunk *chk;
8984
8985
8986         if (net == NULL)
8987                 /* must have a net pointer */
8988                 return;
8989
8990         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8991         if (outchain == NULL) {
8992                 /* gak out of memory */
8993                 return;
8994         }
8995 #ifdef SCTP_MBUF_LOGGING
8996         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8997                 struct mbuf *mat;
8998
8999                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9000                         if (SCTP_BUF_IS_EXTENDED(mat)) {
9001                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9002                         }
9003                 }
9004         }
9005 #endif
9006         chdr = mtod(outchain, struct sctp_chunkhdr *);
9007         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9008         chdr->chunk_flags = 0;
9009         if (chk_length % 4) {
9010                 /* need pad */
9011                 uint32_t cpthis = 0;
9012                 int padlen;
9013
9014                 padlen = 4 - (chk_length % 4);
9015                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9016         }
9017         sctp_alloc_a_chunk(stcb, chk);
9018         if (chk == NULL) {
9019                 /* no memory */
9020                 sctp_m_freem(outchain);
9021                 return;
9022         }
9023         chk->copy_by_ref = 0;
9024         chk->send_size = chk_length;
9025         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9026         chk->rec.chunk_id.can_take_data = 1;
9027         chk->sent = SCTP_DATAGRAM_UNSENT;
9028         chk->snd_count = 0;
9029         chk->flags = 0;
9030         chk->asoc = &stcb->asoc;
9031         chk->data = outchain;
9032         chk->whoTo = net;
9033         atomic_add_int(&chk->whoTo->ref_count, 1);
9034         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9035         chk->asoc->ctrl_queue_cnt++;
9036 }
9037
9038 void
9039 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9040 {
9041         /* formulate and queue a cookie-ack back to sender */
9042         struct mbuf *cookie_ack;
9043         struct sctp_chunkhdr *hdr;
9044         struct sctp_tmit_chunk *chk;
9045
9046         cookie_ack = NULL;
9047         SCTP_TCB_LOCK_ASSERT(stcb);
9048
9049         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9050         if (cookie_ack == NULL) {
9051                 /* no mbuf's */
9052                 return;
9053         }
9054         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9055         sctp_alloc_a_chunk(stcb, chk);
9056         if (chk == NULL) {
9057                 /* no memory */
9058                 sctp_m_freem(cookie_ack);
9059                 return;
9060         }
9061         chk->copy_by_ref = 0;
9062         chk->send_size = sizeof(struct sctp_chunkhdr);
9063         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9064         chk->rec.chunk_id.can_take_data = 1;
9065         chk->sent = SCTP_DATAGRAM_UNSENT;
9066         chk->snd_count = 0;
9067         chk->flags = 0;
9068         chk->asoc = &stcb->asoc;
9069         chk->data = cookie_ack;
9070         if (chk->asoc->last_control_chunk_from != NULL) {
9071                 chk->whoTo = chk->asoc->last_control_chunk_from;
9072                 atomic_add_int(&chk->whoTo->ref_count, 1);
9073         } else {
9074                 chk->whoTo = NULL;
9075         }
9076         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9077         hdr->chunk_type = SCTP_COOKIE_ACK;
9078         hdr->chunk_flags = 0;
9079         hdr->chunk_length = htons(chk->send_size);
9080         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9081         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9082         chk->asoc->ctrl_queue_cnt++;
9083         return;
9084 }
9085
9086
9087 void
9088 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9089 {
9090         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9091         struct mbuf *m_shutdown_ack;
9092         struct sctp_shutdown_ack_chunk *ack_cp;
9093         struct sctp_tmit_chunk *chk;
9094
9095         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9096         if (m_shutdown_ack == NULL) {
9097                 /* no mbuf's */
9098                 return;
9099         }
9100         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9101         sctp_alloc_a_chunk(stcb, chk);
9102         if (chk == NULL) {
9103                 /* no memory */
9104                 sctp_m_freem(m_shutdown_ack);
9105                 return;
9106         }
9107         chk->copy_by_ref = 0;
9108         chk->send_size = sizeof(struct sctp_chunkhdr);
9109         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9110         chk->rec.chunk_id.can_take_data = 1;
9111         chk->sent = SCTP_DATAGRAM_UNSENT;
9112         chk->snd_count = 0;
9113         chk->flags = 0;
9114         chk->asoc = &stcb->asoc;
9115         chk->data = m_shutdown_ack;
9116         chk->whoTo = net;
9117         if (chk->whoTo) {
9118                 atomic_add_int(&chk->whoTo->ref_count, 1);
9119         }
9120         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9121         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9122         ack_cp->ch.chunk_flags = 0;
9123         ack_cp->ch.chunk_length = htons(chk->send_size);
9124         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9125         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9126         chk->asoc->ctrl_queue_cnt++;
9127         return;
9128 }
9129
9130 void
9131 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9132 {
9133         /* formulate and queue a SHUTDOWN to the sender */
9134         struct mbuf *m_shutdown;
9135         struct sctp_shutdown_chunk *shutdown_cp;
9136         struct sctp_tmit_chunk *chk;
9137
9138         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9139         if (m_shutdown == NULL) {
9140                 /* no mbuf's */
9141                 return;
9142         }
9143         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9144         sctp_alloc_a_chunk(stcb, chk);
9145         if (chk == NULL) {
9146                 /* no memory */
9147                 sctp_m_freem(m_shutdown);
9148                 return;
9149         }
9150         chk->copy_by_ref = 0;
9151         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9152         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9153         chk->rec.chunk_id.can_take_data = 1;
9154         chk->sent = SCTP_DATAGRAM_UNSENT;
9155         chk->snd_count = 0;
9156         chk->flags = 0;
9157         chk->asoc = &stcb->asoc;
9158         chk->data = m_shutdown;
9159         chk->whoTo = net;
9160         if (chk->whoTo) {
9161                 atomic_add_int(&chk->whoTo->ref_count, 1);
9162         }
9163         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9164         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9165         shutdown_cp->ch.chunk_flags = 0;
9166         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9167         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9168         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9169         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9170         chk->asoc->ctrl_queue_cnt++;
9171         return;
9172 }
9173
9174 void
9175 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9176 {
9177         /*
9178          * formulate and queue an ASCONF to the peer. ASCONF parameters
9179          * should be queued on the assoc queue.
9180          */
9181         struct sctp_tmit_chunk *chk;
9182         struct mbuf *m_asconf;
9183         int len;
9184
9185         SCTP_TCB_LOCK_ASSERT(stcb);
9186
9187         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9188             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9189                 /* can't send a new one if there is one in flight already */
9190                 return;
9191         }
9192         /* compose an ASCONF chunk, maximum length is PMTU */
9193         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9194         if (m_asconf == NULL) {
9195                 return;
9196         }
9197         sctp_alloc_a_chunk(stcb, chk);
9198         if (chk == NULL) {
9199                 /* no memory */
9200                 sctp_m_freem(m_asconf);
9201                 return;
9202         }
9203         chk->copy_by_ref = 0;
9204         chk->data = m_asconf;
9205         chk->send_size = len;
9206         chk->rec.chunk_id.id = SCTP_ASCONF;
9207         chk->rec.chunk_id.can_take_data = 0;
9208         chk->sent = SCTP_DATAGRAM_UNSENT;
9209         chk->snd_count = 0;
9210         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9211         chk->asoc = &stcb->asoc;
9212         chk->whoTo = net;
9213         if (chk->whoTo) {
9214                 atomic_add_int(&chk->whoTo->ref_count, 1);
9215         }
9216         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9217         chk->asoc->ctrl_queue_cnt++;
9218         return;
9219 }
9220
9221 void
9222 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9223 {
9224         /*
9225          * formulate and queue a asconf-ack back to sender. the asconf-ack
9226          * must be stored in the tcb.
9227          */
9228         struct sctp_tmit_chunk *chk;
9229         struct sctp_asconf_ack *ack, *latest_ack;
9230         struct mbuf *m_ack;
9231         struct sctp_nets *net = NULL;
9232
9233         SCTP_TCB_LOCK_ASSERT(stcb);
9234         /* Get the latest ASCONF-ACK */
9235         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9236         if (latest_ack == NULL) {
9237                 return;
9238         }
9239         if (latest_ack->last_sent_to != NULL &&
9240             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9241                 /* we're doing a retransmission */
9242                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9243                 if (net == NULL) {
9244                         /* no alternate */
9245                         if (stcb->asoc.last_control_chunk_from == NULL) {
9246                                 if (stcb->asoc.alternate) {
9247                                         net = stcb->asoc.alternate;
9248                                 } else {
9249                                         net = stcb->asoc.primary_destination;
9250                                 }
9251                         } else {
9252                                 net = stcb->asoc.last_control_chunk_from;
9253                         }
9254                 }
9255         } else {
9256                 /* normal case */
9257                 if (stcb->asoc.last_control_chunk_from == NULL) {
9258                         if (stcb->asoc.alternate) {
9259                                 net = stcb->asoc.alternate;
9260                         } else {
9261                                 net = stcb->asoc.primary_destination;
9262                         }
9263                 } else {
9264                         net = stcb->asoc.last_control_chunk_from;
9265                 }
9266         }
9267         latest_ack->last_sent_to = net;
9268
9269         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9270                 if (ack->data == NULL) {
9271                         continue;
9272                 }
9273                 /* copy the asconf_ack */
9274                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9275                 if (m_ack == NULL) {
9276                         /* couldn't copy it */
9277                         return;
9278                 }
9279 #ifdef SCTP_MBUF_LOGGING
9280                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9281                         struct mbuf *mat;
9282
9283                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9284                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9285                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9286                                 }
9287                         }
9288                 }
9289 #endif
9290
9291                 sctp_alloc_a_chunk(stcb, chk);
9292                 if (chk == NULL) {
9293                         /* no memory */
9294                         if (m_ack)
9295                                 sctp_m_freem(m_ack);
9296                         return;
9297                 }
9298                 chk->copy_by_ref = 0;
9299
9300                 chk->whoTo = net;
9301                 if (chk->whoTo) {
9302                         atomic_add_int(&chk->whoTo->ref_count, 1);
9303                 }
9304                 chk->data = m_ack;
9305                 chk->send_size = 0;
9306                 /* Get size */
9307                 chk->send_size = ack->len;
9308                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9309                 chk->rec.chunk_id.can_take_data = 1;
9310                 chk->sent = SCTP_DATAGRAM_UNSENT;
9311                 chk->snd_count = 0;
9312                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9313                 chk->asoc = &stcb->asoc;
9314
9315                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9316                 chk->asoc->ctrl_queue_cnt++;
9317         }
9318         return;
9319 }
9320
9321
9322 static int
9323 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9324     struct sctp_tcb *stcb,
9325     struct sctp_association *asoc,
9326     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9327 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9328     SCTP_UNUSED
9329 #endif
9330 )
9331 {
9332         /*-
9333          * send out one MTU of retransmission. If fast_retransmit is
9334          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9335          * rwnd. For a Cookie or Asconf in the control chunk queue we
9336          * retransmit them by themselves.
9337          *
9338          * For data chunks we will pick out the lowest TSN's in the sent_queue
9339          * marked for resend and bundle them all together (up to a MTU of
9340          * destination). The address to send to should have been
9341          * selected/changed where the retransmission was marked (i.e. in FR
9342          * or t3-timeout routines).
9343          */
9344         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9345         struct sctp_tmit_chunk *chk, *fwd;
9346         struct mbuf *m, *endofchain;
9347         struct sctp_nets *net = NULL;
9348         uint32_t tsns_sent = 0;
9349         int no_fragmentflg, bundle_at, cnt_thru;
9350         unsigned int mtu;
9351         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9352         struct sctp_auth_chunk *auth = NULL;
9353         uint32_t auth_offset = 0;
9354         uint16_t auth_keyid;
9355         int override_ok = 1;
9356         int data_auth_reqd = 0;
9357         uint32_t dmtu = 0;
9358
9359         SCTP_TCB_LOCK_ASSERT(stcb);
9360         tmr_started = ctl_cnt = bundle_at = error = 0;
9361         no_fragmentflg = 1;
9362         fwd_tsn = 0;
9363         *cnt_out = 0;
9364         fwd = NULL;
9365         endofchain = m = NULL;
9366         auth_keyid = stcb->asoc.authinfo.active_keyid;
9367 #ifdef SCTP_AUDITING_ENABLED
9368         sctp_audit_log(0xC3, 1);
9369 #endif
9370         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9371             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9372                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9373                     asoc->sent_queue_retran_cnt);
9374                 asoc->sent_queue_cnt = 0;
9375                 asoc->sent_queue_cnt_removeable = 0;
9376                 /* send back 0/0 so we enter normal transmission */
9377                 *cnt_out = 0;
9378                 return (0);
9379         }
9380         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9381                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9382                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9383                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9384                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9385                                 continue;
9386                         }
9387                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9388                                 if (chk != asoc->str_reset) {
9389                                         /*
9390                                          * not eligible for retran if its
9391                                          * not ours
9392                                          */
9393                                         continue;
9394                                 }
9395                         }
9396                         ctl_cnt++;
9397                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9398                                 fwd_tsn = 1;
9399                         }
9400                         /*
9401                          * Add an AUTH chunk, if chunk requires it save the
9402                          * offset into the chain for AUTH
9403                          */
9404                         if ((auth == NULL) &&
9405                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9406                             stcb->asoc.peer_auth_chunks))) {
9407                                 m = sctp_add_auth_chunk(m, &endofchain,
9408                                     &auth, &auth_offset,
9409                                     stcb,
9410                                     chk->rec.chunk_id.id);
9411                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9412                         }
9413                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9414                         break;
9415                 }
9416         }
9417         one_chunk = 0;
9418         cnt_thru = 0;
9419         /* do we have control chunks to retransmit? */
9420         if (m != NULL) {
9421                 /* Start a timer no matter if we suceed or fail */
9422                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9423                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9424                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9425                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9426                 chk->snd_count++;       /* update our count */
9427                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9428                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9429                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9430                     no_fragmentflg, 0, 0,
9431                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9432                     chk->whoTo->port, so_locked, NULL, NULL))) {
9433                         SCTP_STAT_INCR(sctps_lowlevelerr);
9434                         return (error);
9435                 }
9436                 endofchain = NULL;
9437                 auth = NULL;
9438                 auth_offset = 0;
9439                 /*
9440                  * We don't want to mark the net->sent time here since this
9441                  * we use this for HB and retrans cannot measure RTT
9442                  */
9443                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9444                 *cnt_out += 1;
9445                 chk->sent = SCTP_DATAGRAM_SENT;
9446                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9447                 if (fwd_tsn == 0) {
9448                         return (0);
9449                 } else {
9450                         /* Clean up the fwd-tsn list */
9451                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9452                         return (0);
9453                 }
9454         }
9455         /*
9456          * Ok, it is just data retransmission we need to do or that and a
9457          * fwd-tsn with it all.
9458          */
9459         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9460                 return (SCTP_RETRAN_DONE);
9461         }
9462         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9463             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9464                 /* not yet open, resend the cookie and that is it */
9465                 return (1);
9466         }
9467 #ifdef SCTP_AUDITING_ENABLED
9468         sctp_auditing(20, inp, stcb, NULL);
9469 #endif
9470         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9471         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9472                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9473                         /* No, not sent to this net or not ready for rtx */
9474                         continue;
9475                 }
9476                 if (chk->data == NULL) {
9477                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9478                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9479                         continue;
9480                 }
9481                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9482                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9483                         /* Gak, we have exceeded max unlucky retran, abort! */
9484                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9485                             chk->snd_count,
9486                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9487                         atomic_add_int(&stcb->asoc.refcnt, 1);
9488                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9489                         SCTP_TCB_LOCK(stcb);
9490                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9491                         return (SCTP_RETRAN_EXIT);
9492                 }
9493                 /* pick up the net */
9494                 net = chk->whoTo;
9495                 switch (net->ro._l_addr.sa.sa_family) {
9496 #ifdef INET
9497                 case AF_INET:
9498                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9499                         break;
9500 #endif
9501 #ifdef INET6
9502                 case AF_INET6:
9503                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9504                         break;
9505 #endif
9506                 default:
9507                         /* TSNH */
9508                         mtu = net->mtu;
9509                         break;
9510                 }
9511
9512                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9513                         /* No room in peers rwnd */
9514                         uint32_t tsn;
9515
9516                         tsn = asoc->last_acked_seq + 1;
9517                         if (tsn == chk->rec.data.TSN_seq) {
9518                                 /*
9519                                  * we make a special exception for this
9520                                  * case. The peer has no rwnd but is missing
9521                                  * the lowest chunk.. which is probably what
9522                                  * is holding up the rwnd.
9523                                  */
9524                                 goto one_chunk_around;
9525                         }
9526                         return (1);
9527                 }
9528 one_chunk_around:
9529                 if (asoc->peers_rwnd < mtu) {
9530                         one_chunk = 1;
9531                         if ((asoc->peers_rwnd == 0) &&
9532                             (asoc->total_flight == 0)) {
9533                                 chk->window_probe = 1;
9534                                 chk->whoTo->window_probe = 1;
9535                         }
9536                 }
9537 #ifdef SCTP_AUDITING_ENABLED
9538                 sctp_audit_log(0xC3, 2);
9539 #endif
9540                 bundle_at = 0;
9541                 m = NULL;
9542                 net->fast_retran_ip = 0;
9543                 if (chk->rec.data.doing_fast_retransmit == 0) {
9544                         /*
9545                          * if no FR in progress skip destination that have
9546                          * flight_size > cwnd.
9547                          */
9548                         if (net->flight_size >= net->cwnd) {
9549                                 continue;
9550                         }
9551                 } else {
9552                         /*
9553                          * Mark the destination net to have FR recovery
9554                          * limits put on it.
9555                          */
9556                         *fr_done = 1;
9557                         net->fast_retran_ip = 1;
9558                 }
9559
9560                 /*
9561                  * if no AUTH is yet included and this chunk requires it,
9562                  * make sure to account for it.  We don't apply the size
9563                  * until the AUTH chunk is actually added below in case
9564                  * there is no room for this chunk.
9565                  */
9566                 if (data_auth_reqd && (auth == NULL)) {
9567                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9568                 } else
9569                         dmtu = 0;
9570
9571                 if ((chk->send_size <= (mtu - dmtu)) ||
9572                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9573                         /* ok we will add this one */
9574                         if (data_auth_reqd) {
9575                                 if (auth == NULL) {
9576                                         m = sctp_add_auth_chunk(m,
9577                                             &endofchain,
9578                                             &auth,
9579                                             &auth_offset,
9580                                             stcb,
9581                                             SCTP_DATA);
9582                                         auth_keyid = chk->auth_keyid;
9583                                         override_ok = 0;
9584                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9585                                 } else if (override_ok) {
9586                                         auth_keyid = chk->auth_keyid;
9587                                         override_ok = 0;
9588                                 } else if (chk->auth_keyid != auth_keyid) {
9589                                         /* different keyid, so done bundling */
9590                                         break;
9591                                 }
9592                         }
9593                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9594                         if (m == NULL) {
9595                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9596                                 return (ENOMEM);
9597                         }
9598                         /* Do clear IP_DF ? */
9599                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9600                                 no_fragmentflg = 0;
9601                         }
9602                         /* upate our MTU size */
9603                         if (mtu > (chk->send_size + dmtu))
9604                                 mtu -= (chk->send_size + dmtu);
9605                         else
9606                                 mtu = 0;
9607                         data_list[bundle_at++] = chk;
9608                         if (one_chunk && (asoc->total_flight <= 0)) {
9609                                 SCTP_STAT_INCR(sctps_windowprobed);
9610                         }
9611                 }
9612                 if (one_chunk == 0) {
9613                         /*
9614                          * now are there anymore forward from chk to pick
9615                          * up?
9616                          */
9617                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9618                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9619                                         /* Nope, not for retran */
9620                                         continue;
9621                                 }
9622                                 if (fwd->whoTo != net) {
9623                                         /* Nope, not the net in question */
9624                                         continue;
9625                                 }
9626                                 if (data_auth_reqd && (auth == NULL)) {
9627                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9628                                 } else
9629                                         dmtu = 0;
9630                                 if (fwd->send_size <= (mtu - dmtu)) {
9631                                         if (data_auth_reqd) {
9632                                                 if (auth == NULL) {
9633                                                         m = sctp_add_auth_chunk(m,
9634                                                             &endofchain,
9635                                                             &auth,
9636                                                             &auth_offset,
9637                                                             stcb,
9638                                                             SCTP_DATA);
9639                                                         auth_keyid = fwd->auth_keyid;
9640                                                         override_ok = 0;
9641                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9642                                                 } else if (override_ok) {
9643                                                         auth_keyid = fwd->auth_keyid;
9644                                                         override_ok = 0;
9645                                                 } else if (fwd->auth_keyid != auth_keyid) {
9646                                                         /*
9647                                                          * different keyid,
9648                                                          * so done bundling
9649                                                          */
9650                                                         break;
9651                                                 }
9652                                         }
9653                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9654                                         if (m == NULL) {
9655                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9656                                                 return (ENOMEM);
9657                                         }
9658                                         /* Do clear IP_DF ? */
9659                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9660                                                 no_fragmentflg = 0;
9661                                         }
9662                                         /* upate our MTU size */
9663                                         if (mtu > (fwd->send_size + dmtu))
9664                                                 mtu -= (fwd->send_size + dmtu);
9665                                         else
9666                                                 mtu = 0;
9667                                         data_list[bundle_at++] = fwd;
9668                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9669                                                 break;
9670                                         }
9671                                 } else {
9672                                         /* can't fit so we are done */
9673                                         break;
9674                                 }
9675                         }
9676                 }
9677                 /* Is there something to send for this destination? */
9678                 if (m) {
9679                         /*
9680                          * No matter if we fail/or suceed we should start a
9681                          * timer. A failure is like a lost IP packet :-)
9682                          */
9683                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9684                                 /*
9685                                  * no timer running on this destination
9686                                  * restart it.
9687                                  */
9688                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9689                                 tmr_started = 1;
9690                         }
9691                         /* Now lets send it, if there is anything to send :> */
9692                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9693                             (struct sockaddr *)&net->ro._l_addr, m,
9694                             auth_offset, auth, auth_keyid,
9695                             no_fragmentflg, 0, 0,
9696                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9697                             net->port, so_locked, NULL, NULL))) {
9698                                 /* error, we could not output */
9699                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9700                                 return (error);
9701                         }
9702                         endofchain = NULL;
9703                         auth = NULL;
9704                         auth_offset = 0;
9705                         /* For HB's */
9706                         /*
9707                          * We don't want to mark the net->sent time here
9708                          * since this we use this for HB and retrans cannot
9709                          * measure RTT
9710                          */
9711                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9712
9713                         /* For auto-close */
9714                         cnt_thru++;
9715                         if (*now_filled == 0) {
9716                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9717                                 *now = asoc->time_last_sent;
9718                                 *now_filled = 1;
9719                         } else {
9720                                 asoc->time_last_sent = *now;
9721                         }
9722                         *cnt_out += bundle_at;
9723 #ifdef SCTP_AUDITING_ENABLED
9724                         sctp_audit_log(0xC4, bundle_at);
9725 #endif
9726                         if (bundle_at) {
9727                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9728                         }
9729                         for (i = 0; i < bundle_at; i++) {
9730                                 SCTP_STAT_INCR(sctps_sendretransdata);
9731                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9732                                 /*
9733                                  * When we have a revoked data, and we
9734                                  * retransmit it, then we clear the revoked
9735                                  * flag since this flag dictates if we
9736                                  * subtracted from the fs
9737                                  */
9738                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9739                                         /* Deflate the cwnd */
9740                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9741                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9742                                 }
9743                                 data_list[i]->snd_count++;
9744                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9745                                 /* record the time */
9746                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9747                                 if (data_list[i]->book_size_scale) {
9748                                         /*
9749                                          * need to double the book size on
9750                                          * this one
9751                                          */
9752                                         data_list[i]->book_size_scale = 0;
9753                                         /*
9754                                          * Since we double the booksize, we
9755                                          * must also double the output queue
9756                                          * size, since this get shrunk when
9757                                          * we free by this amount.
9758                                          */
9759                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9760                                         data_list[i]->book_size *= 2;
9761
9762
9763                                 } else {
9764                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9765                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9766                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9767                                         }
9768                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9769                                             (uint32_t) (data_list[i]->send_size +
9770                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9771                                 }
9772                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9773                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9774                                             data_list[i]->whoTo->flight_size,
9775                                             data_list[i]->book_size,
9776                                             (uintptr_t) data_list[i]->whoTo,
9777                                             data_list[i]->rec.data.TSN_seq);
9778                                 }
9779                                 sctp_flight_size_increase(data_list[i]);
9780                                 sctp_total_flight_increase(stcb, data_list[i]);
9781                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9782                                         /* SWS sender side engages */
9783                                         asoc->peers_rwnd = 0;
9784                                 }
9785                                 if ((i == 0) &&
9786                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9787                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9788                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9789                                             (tmr_started == 0)) {
9790                                                 /*-
9791                                                  * ok we just fast-retrans'd
9792                                                  * the lowest TSN, i.e the
9793                                                  * first on the list. In
9794                                                  * this case we want to give
9795                                                  * some more time to get a
9796                                                  * SACK back without a
9797                                                  * t3-expiring.
9798                                                  */
9799                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9800                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9801                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9802                                         }
9803                                 }
9804                         }
9805                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9806                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9807                         }
9808 #ifdef SCTP_AUDITING_ENABLED
9809                         sctp_auditing(21, inp, stcb, NULL);
9810 #endif
9811                 } else {
9812                         /* None will fit */
9813                         return (1);
9814                 }
9815                 if (asoc->sent_queue_retran_cnt <= 0) {
9816                         /* all done we have no more to retran */
9817                         asoc->sent_queue_retran_cnt = 0;
9818                         break;
9819                 }
9820                 if (one_chunk) {
9821                         /* No more room in rwnd */
9822                         return (1);
9823                 }
9824                 /* stop the for loop here. we sent out a packet */
9825                 break;
9826         }
9827         return (0);
9828 }
9829
9830 static void
9831 sctp_timer_validation(struct sctp_inpcb *inp,
9832     struct sctp_tcb *stcb,
9833     struct sctp_association *asoc)
9834 {
9835         struct sctp_nets *net;
9836
9837         /* Validate that a timer is running somewhere */
9838         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9839                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9840                         /* Here is a timer */
9841                         return;
9842                 }
9843         }
9844         SCTP_TCB_LOCK_ASSERT(stcb);
9845         /* Gak, we did not have a timer somewhere */
9846         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9847         if (asoc->alternate) {
9848                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9849         } else {
9850                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9851         }
9852         return;
9853 }
9854
9855 void
9856 sctp_chunk_output(struct sctp_inpcb *inp,
9857     struct sctp_tcb *stcb,
9858     int from_where,
9859     int so_locked
9860 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9861     SCTP_UNUSED
9862 #endif
9863 )
9864 {
9865         /*-
9866          * Ok this is the generic chunk service queue. we must do the
9867          * following:
9868          * - See if there are retransmits pending, if so we must
9869          *   do these first.
9870          * - Service the stream queue that is next, moving any
9871          *   message (note I must get a complete message i.e.
9872          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9873          *   TSN's
9874          * - Check to see if the cwnd/rwnd allows any output, if so we
9875          *   go ahead and fomulate and send the low level chunks. Making sure
9876          *   to combine any control in the control chunk queue also.
9877          */
9878         struct sctp_association *asoc;
9879         struct sctp_nets *net;
9880         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9881         unsigned int burst_cnt = 0;
9882         struct timeval now;
9883         int now_filled = 0;
9884         int nagle_on;
9885         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9886         int un_sent = 0;
9887         int fr_done;
9888         unsigned int tot_frs = 0;
9889
9890         asoc = &stcb->asoc;
9891         /* The Nagle algorithm is only applied when handling a send call. */
9892         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9893                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9894                         nagle_on = 0;
9895                 } else {
9896                         nagle_on = 1;
9897                 }
9898         } else {
9899                 nagle_on = 0;
9900         }
9901         SCTP_TCB_LOCK_ASSERT(stcb);
9902
9903         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9904
9905         if ((un_sent <= 0) &&
9906             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9907             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9908             (asoc->sent_queue_retran_cnt == 0)) {
9909                 /* Nothing to do unless there is something to be sent left */
9910                 return;
9911         }
9912         /*
9913          * Do we have something to send, data or control AND a sack timer
9914          * running, if so piggy-back the sack.
9915          */
9916         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9917                 sctp_send_sack(stcb, so_locked);
9918                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9919         }
9920         while (asoc->sent_queue_retran_cnt) {
9921                 /*-
9922                  * Ok, it is retransmission time only, we send out only ONE
9923                  * packet with a single call off to the retran code.
9924                  */
9925                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9926                         /*-
9927                          * Special hook for handling cookiess discarded
9928                          * by peer that carried data. Send cookie-ack only
9929                          * and then the next call with get the retran's.
9930                          */
9931                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9932                             from_where,
9933                             &now, &now_filled, frag_point, so_locked);
9934                         return;
9935                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9936                         /* if its not from a HB then do it */
9937                         fr_done = 0;
9938                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9939                         if (fr_done) {
9940                                 tot_frs++;
9941                         }
9942                 } else {
9943                         /*
9944                          * its from any other place, we don't allow retran
9945                          * output (only control)
9946                          */
9947                         ret = 1;
9948                 }
9949                 if (ret > 0) {
9950                         /* Can't send anymore */
9951                         /*-
9952                          * now lets push out control by calling med-level
9953                          * output once. this assures that we WILL send HB's
9954                          * if queued too.
9955                          */
9956                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9957                             from_where,
9958                             &now, &now_filled, frag_point, so_locked);
9959 #ifdef SCTP_AUDITING_ENABLED
9960                         sctp_auditing(8, inp, stcb, NULL);
9961 #endif
9962                         sctp_timer_validation(inp, stcb, asoc);
9963                         return;
9964                 }
9965                 if (ret < 0) {
9966                         /*-
9967                          * The count was off.. retran is not happening so do
9968                          * the normal retransmission.
9969                          */
9970 #ifdef SCTP_AUDITING_ENABLED
9971                         sctp_auditing(9, inp, stcb, NULL);
9972 #endif
9973                         if (ret == SCTP_RETRAN_EXIT) {
9974                                 return;
9975                         }
9976                         break;
9977                 }
9978                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9979                         /* Only one transmission allowed out of a timeout */
9980 #ifdef SCTP_AUDITING_ENABLED
9981                         sctp_auditing(10, inp, stcb, NULL);
9982 #endif
9983                         /* Push out any control */
9984                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9985                             &now, &now_filled, frag_point, so_locked);
9986                         return;
9987                 }
9988                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9989                         /* Hit FR burst limit */
9990                         return;
9991                 }
9992                 if ((num_out == 0) && (ret == 0)) {
9993                         /* No more retrans to send */
9994                         break;
9995                 }
9996         }
9997 #ifdef SCTP_AUDITING_ENABLED
9998         sctp_auditing(12, inp, stcb, NULL);
9999 #endif
10000         /* Check for bad destinations, if they exist move chunks around. */
10001         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10002                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10003                         /*-
10004                          * if possible move things off of this address we
10005                          * still may send below due to the dormant state but
10006                          * we try to find an alternate address to send to
10007                          * and if we have one we move all queued data on the
10008                          * out wheel to this alternate address.
10009                          */
10010                         if (net->ref_count > 1)
10011                                 sctp_move_chunks_from_net(stcb, net);
10012                 } else {
10013                         /*-
10014                          * if ((asoc->sat_network) || (net->addr_is_local))
10015                          * { burst_limit = asoc->max_burst *
10016                          * SCTP_SAT_NETWORK_BURST_INCR; }
10017                          */
10018                         if (asoc->max_burst > 0) {
10019                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10020                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10021                                                 /*
10022                                                  * JRS - Use the congestion
10023                                                  * control given in the
10024                                                  * congestion control module
10025                                                  */
10026                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10027                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10028                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10029                                                 }
10030                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10031                                         }
10032                                         net->fast_retran_ip = 0;
10033                                 } else {
10034                                         if (net->flight_size == 0) {
10035                                                 /*
10036                                                  * Should be decaying the
10037                                                  * cwnd here
10038                                                  */
10039                                                 ;
10040                                         }
10041                                 }
10042                         }
10043                 }
10044
10045         }
10046         burst_cnt = 0;
10047         do {
10048                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10049                     &reason_code, 0, from_where,
10050                     &now, &now_filled, frag_point, so_locked);
10051                 if (error) {
10052                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10053                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10054                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10055                         }
10056                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10057                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10058                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10059                         }
10060                         break;
10061                 }
10062                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10063
10064                 tot_out += num_out;
10065                 burst_cnt++;
10066                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10067                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10068                         if (num_out == 0) {
10069                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10070                         }
10071                 }
10072                 if (nagle_on) {
10073                         /*
10074                          * When the Nagle algorithm is used, look at how
10075                          * much is unsent, then if its smaller than an MTU
10076                          * and we have data in flight we stop, except if we
10077                          * are handling a fragmented user message.
10078                          */
10079                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10080                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10081                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10082                             (stcb->asoc.total_flight > 0) &&
10083                             ((stcb->asoc.locked_on_sending == NULL) ||
10084                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10085                                 break;
10086                         }
10087                 }
10088                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10089                     TAILQ_EMPTY(&asoc->send_queue) &&
10090                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10091                         /* Nothing left to send */
10092                         break;
10093                 }
10094                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10095                         /* Nothing left to send */
10096                         break;
10097                 }
10098         } while (num_out &&
10099             ((asoc->max_burst == 0) ||
10100             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10101             (burst_cnt < asoc->max_burst)));
10102
10103         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10104                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10105                         SCTP_STAT_INCR(sctps_maxburstqueued);
10106                         asoc->burst_limit_applied = 1;
10107                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10108                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10109                         }
10110                 } else {
10111                         asoc->burst_limit_applied = 0;
10112                 }
10113         }
10114         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10115                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10116         }
10117         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10118             tot_out);
10119
10120         /*-
10121          * Now we need to clean up the control chunk chain if a ECNE is on
10122          * it. It must be marked as UNSENT again so next call will continue
10123          * to send it until such time that we get a CWR, to remove it.
10124          */
10125         if (stcb->asoc.ecn_echo_cnt_onq)
10126                 sctp_fix_ecn_echo(asoc);
10127         return;
10128 }
10129
10130
10131 int
10132 sctp_output(
10133     struct sctp_inpcb *inp,
10134     struct mbuf *m,
10135     struct sockaddr *addr,
10136     struct mbuf *control,
10137     struct thread *p,
10138     int flags)
10139 {
10140         if (inp == NULL) {
10141                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10142                 return (EINVAL);
10143         }
10144         if (inp->sctp_socket == NULL) {
10145                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10146                 return (EINVAL);
10147         }
10148         return (sctp_sosend(inp->sctp_socket,
10149             addr,
10150             (struct uio *)NULL,
10151             m,
10152             control,
10153             flags, p
10154             ));
10155 }
10156
10157 void
10158 send_forward_tsn(struct sctp_tcb *stcb,
10159     struct sctp_association *asoc)
10160 {
10161         struct sctp_tmit_chunk *chk;
10162         struct sctp_forward_tsn_chunk *fwdtsn;
10163         uint32_t advance_peer_ack_point;
10164
10165         SCTP_TCB_LOCK_ASSERT(stcb);
10166         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10167                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10168                         /* mark it to unsent */
10169                         chk->sent = SCTP_DATAGRAM_UNSENT;
10170                         chk->snd_count = 0;
10171                         /* Do we correct its output location? */
10172                         if (chk->whoTo) {
10173                                 sctp_free_remote_addr(chk->whoTo);
10174                                 chk->whoTo = NULL;
10175                         }
10176                         goto sctp_fill_in_rest;
10177                 }
10178         }
10179         /* Ok if we reach here we must build one */
10180         sctp_alloc_a_chunk(stcb, chk);
10181         if (chk == NULL) {
10182                 return;
10183         }
10184         asoc->fwd_tsn_cnt++;
10185         chk->copy_by_ref = 0;
10186         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10187         chk->rec.chunk_id.can_take_data = 0;
10188         chk->asoc = asoc;
10189         chk->whoTo = NULL;
10190         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10191         if (chk->data == NULL) {
10192                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10193                 return;
10194         }
10195         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10196         chk->sent = SCTP_DATAGRAM_UNSENT;
10197         chk->snd_count = 0;
10198         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10199         asoc->ctrl_queue_cnt++;
10200 sctp_fill_in_rest:
10201         /*-
10202          * Here we go through and fill out the part that deals with
10203          * stream/seq of the ones we skip.
10204          */
10205         SCTP_BUF_LEN(chk->data) = 0;
10206         {
10207                 struct sctp_tmit_chunk *at, *tp1, *last;
10208                 struct sctp_strseq *strseq;
10209                 unsigned int cnt_of_space, i, ovh;
10210                 unsigned int space_needed;
10211                 unsigned int cnt_of_skipped = 0;
10212
10213                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10214                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10215                                 /* no more to look at */
10216                                 break;
10217                         }
10218                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10219                                 /* We don't report these */
10220                                 continue;
10221                         }
10222                         cnt_of_skipped++;
10223                 }
10224                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10225                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10226
10227                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10228
10229                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10230                         ovh = SCTP_MIN_OVERHEAD;
10231                 } else {
10232                         ovh = SCTP_MIN_V4_OVERHEAD;
10233                 }
10234                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10235                         /* trim to a mtu size */
10236                         cnt_of_space = asoc->smallest_mtu - ovh;
10237                 }
10238                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10239                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10240                             0xff, 0, cnt_of_skipped,
10241                             asoc->advanced_peer_ack_point);
10242
10243                 }
10244                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10245                 if (cnt_of_space < space_needed) {
10246                         /*-
10247                          * ok we must trim down the chunk by lowering the
10248                          * advance peer ack point.
10249                          */
10250                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10251                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10252                                     0xff, 0xff, cnt_of_space,
10253                                     space_needed);
10254                         }
10255                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10256                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10257                         /*-
10258                          * Go through and find the TSN that will be the one
10259                          * we report.
10260                          */
10261                         at = TAILQ_FIRST(&asoc->sent_queue);
10262                         if (at != NULL) {
10263                                 for (i = 0; i < cnt_of_skipped; i++) {
10264                                         tp1 = TAILQ_NEXT(at, sctp_next);
10265                                         if (tp1 == NULL) {
10266                                                 break;
10267                                         }
10268                                         at = tp1;
10269                                 }
10270                         }
10271                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10272                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10273                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10274                                     asoc->advanced_peer_ack_point);
10275                         }
10276                         last = at;
10277                         /*-
10278                          * last now points to last one I can report, update
10279                          * peer ack point
10280                          */
10281                         if (last)
10282                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10283                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10284                             cnt_of_skipped * sizeof(struct sctp_strseq);
10285                 }
10286                 chk->send_size = space_needed;
10287                 /* Setup the chunk */
10288                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10289                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10290                 fwdtsn->ch.chunk_flags = 0;
10291                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10292                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10293                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10294                 fwdtsn++;
10295                 /*-
10296                  * Move pointer to after the fwdtsn and transfer to the
10297                  * strseq pointer.
10298                  */
10299                 strseq = (struct sctp_strseq *)fwdtsn;
10300                 /*-
10301                  * Now populate the strseq list. This is done blindly
10302                  * without pulling out duplicate stream info. This is
10303                  * inefficent but won't harm the process since the peer will
10304                  * look at these in sequence and will thus release anything.
10305                  * It could mean we exceed the PMTU and chop off some that
10306                  * we could have included.. but this is unlikely (aka 1432/4
10307                  * would mean 300+ stream seq's would have to be reported in
10308                  * one FWD-TSN. With a bit of work we can later FIX this to
10309                  * optimize and pull out duplcates.. but it does add more
10310                  * overhead. So for now... not!
10311                  */
10312                 at = TAILQ_FIRST(&asoc->sent_queue);
10313                 for (i = 0; i < cnt_of_skipped; i++) {
10314                         tp1 = TAILQ_NEXT(at, sctp_next);
10315                         if (tp1 == NULL)
10316                                 break;
10317                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10318                                 /* We don't report these */
10319                                 i--;
10320                                 at = tp1;
10321                                 continue;
10322                         }
10323                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10324                                 at->rec.data.fwd_tsn_cnt = 0;
10325                         }
10326                         strseq->stream = ntohs(at->rec.data.stream_number);
10327                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10328                         strseq++;
10329                         at = tp1;
10330                 }
10331         }
10332         return;
10333 }
10334
10335 void
10336 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10337 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10338     SCTP_UNUSED
10339 #endif
10340 )
10341 {
10342         /*-
10343          * Queue up a SACK or NR-SACK in the control queue.
10344          * We must first check to see if a SACK or NR-SACK is
10345          * somehow on the control queue.
10346          * If so, we will take and and remove the old one.
10347          */
10348         struct sctp_association *asoc;
10349         struct sctp_tmit_chunk *chk, *a_chk;
10350         struct sctp_sack_chunk *sack;
10351         struct sctp_nr_sack_chunk *nr_sack;
10352         struct sctp_gap_ack_block *gap_descriptor;
10353         struct sack_track *selector;
10354         int mergeable = 0;
10355         int offset;
10356         caddr_t limit;
10357         uint32_t *dup;
10358         int limit_reached = 0;
10359         unsigned int i, siz, j;
10360         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10361         int num_dups = 0;
10362         int space_req;
10363         uint32_t highest_tsn;
10364         uint8_t flags;
10365         uint8_t type;
10366         uint8_t tsn_map;
10367
10368         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10369             (stcb->asoc.peer_supports_nr_sack == 1)) {
10370                 type = SCTP_NR_SELECTIVE_ACK;
10371         } else {
10372                 type = SCTP_SELECTIVE_ACK;
10373         }
10374         a_chk = NULL;
10375         asoc = &stcb->asoc;
10376         SCTP_TCB_LOCK_ASSERT(stcb);
10377         if (asoc->last_data_chunk_from == NULL) {
10378                 /* Hmm we never received anything */
10379                 return;
10380         }
10381         sctp_slide_mapping_arrays(stcb);
10382         sctp_set_rwnd(stcb, asoc);
10383         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10384                 if (chk->rec.chunk_id.id == type) {
10385                         /* Hmm, found a sack already on queue, remove it */
10386                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10387                         asoc->ctrl_queue_cnt--;
10388                         a_chk = chk;
10389                         if (a_chk->data) {
10390                                 sctp_m_freem(a_chk->data);
10391                                 a_chk->data = NULL;
10392                         }
10393                         if (a_chk->whoTo) {
10394                                 sctp_free_remote_addr(a_chk->whoTo);
10395                                 a_chk->whoTo = NULL;
10396                         }
10397                         break;
10398                 }
10399         }
10400         if (a_chk == NULL) {
10401                 sctp_alloc_a_chunk(stcb, a_chk);
10402                 if (a_chk == NULL) {
10403                         /* No memory so we drop the idea, and set a timer */
10404                         if (stcb->asoc.delayed_ack) {
10405                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10406                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10407                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10408                                     stcb->sctp_ep, stcb, NULL);
10409                         } else {
10410                                 stcb->asoc.send_sack = 1;
10411                         }
10412                         return;
10413                 }
10414                 a_chk->copy_by_ref = 0;
10415                 a_chk->rec.chunk_id.id = type;
10416                 a_chk->rec.chunk_id.can_take_data = 1;
10417         }
10418         /* Clear our pkt counts */
10419         asoc->data_pkts_seen = 0;
10420
10421         a_chk->asoc = asoc;
10422         a_chk->snd_count = 0;
10423         a_chk->send_size = 0;   /* fill in later */
10424         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10425         a_chk->whoTo = NULL;
10426
10427         if ((asoc->numduptsns) ||
10428             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10429                 /*-
10430                  * Ok, we have some duplicates or the destination for the
10431                  * sack is unreachable, lets see if we can select an
10432                  * alternate than asoc->last_data_chunk_from
10433                  */
10434                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10435                     (asoc->used_alt_onsack > asoc->numnets)) {
10436                         /* We used an alt last time, don't this time */
10437                         a_chk->whoTo = NULL;
10438                 } else {
10439                         asoc->used_alt_onsack++;
10440                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10441                 }
10442                 if (a_chk->whoTo == NULL) {
10443                         /* Nope, no alternate */
10444                         a_chk->whoTo = asoc->last_data_chunk_from;
10445                         asoc->used_alt_onsack = 0;
10446                 }
10447         } else {
10448                 /*
10449                  * No duplicates so we use the last place we received data
10450                  * from.
10451                  */
10452                 asoc->used_alt_onsack = 0;
10453                 a_chk->whoTo = asoc->last_data_chunk_from;
10454         }
10455         if (a_chk->whoTo) {
10456                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10457         }
10458         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10459                 highest_tsn = asoc->highest_tsn_inside_map;
10460         } else {
10461                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10462         }
10463         if (highest_tsn == asoc->cumulative_tsn) {
10464                 /* no gaps */
10465                 if (type == SCTP_SELECTIVE_ACK) {
10466                         space_req = sizeof(struct sctp_sack_chunk);
10467                 } else {
10468                         space_req = sizeof(struct sctp_nr_sack_chunk);
10469                 }
10470         } else {
10471                 /* gaps get a cluster */
10472                 space_req = MCLBYTES;
10473         }
10474         /* Ok now lets formulate a MBUF with our sack */
10475         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10476         if ((a_chk->data == NULL) ||
10477             (a_chk->whoTo == NULL)) {
10478                 /* rats, no mbuf memory */
10479                 if (a_chk->data) {
10480                         /* was a problem with the destination */
10481                         sctp_m_freem(a_chk->data);
10482                         a_chk->data = NULL;
10483                 }
10484                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10485                 /* sa_ignore NO_NULL_CHK */
10486                 if (stcb->asoc.delayed_ack) {
10487                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10488                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10489                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10490                             stcb->sctp_ep, stcb, NULL);
10491                 } else {
10492                         stcb->asoc.send_sack = 1;
10493                 }
10494                 return;
10495         }
10496         /* ok, lets go through and fill it in */
10497         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10498         space = M_TRAILINGSPACE(a_chk->data);
10499         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10500                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10501         }
10502         limit = mtod(a_chk->data, caddr_t);
10503         limit += space;
10504
10505         flags = 0;
10506
10507         if ((asoc->sctp_cmt_on_off > 0) &&
10508             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10509                 /*-
10510                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10511                  * received, then set high bit to 1, else 0. Reset
10512                  * pkts_rcvd.
10513                  */
10514                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10515                 asoc->cmt_dac_pkts_rcvd = 0;
10516         }
10517 #ifdef SCTP_ASOCLOG_OF_TSNS
10518         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10519         stcb->asoc.cumack_log_atsnt++;
10520         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10521                 stcb->asoc.cumack_log_atsnt = 0;
10522         }
10523 #endif
10524         /* reset the readers interpretation */
10525         stcb->freed_by_sorcv_sincelast = 0;
10526
10527         if (type == SCTP_SELECTIVE_ACK) {
10528                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10529                 nr_sack = NULL;
10530                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10531                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10532                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10533                 } else {
10534                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10535                 }
10536         } else {
10537                 sack = NULL;
10538                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10539                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10540                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10541                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10542                 } else {
10543                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10544                 }
10545         }
10546
10547         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10548                 offset = 1;
10549         } else {
10550                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10551         }
10552         if (((type == SCTP_SELECTIVE_ACK) &&
10553             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10554             ((type == SCTP_NR_SELECTIVE_ACK) &&
10555             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10556                 /* we have a gap .. maybe */
10557                 for (i = 0; i < siz; i++) {
10558                         tsn_map = asoc->mapping_array[i];
10559                         if (type == SCTP_SELECTIVE_ACK) {
10560                                 tsn_map |= asoc->nr_mapping_array[i];
10561                         }
10562                         if (i == 0) {
10563                                 /*
10564                                  * Clear all bits corresponding to TSNs
10565                                  * smaller or equal to the cumulative TSN.
10566                                  */
10567                                 tsn_map &= (~0 << (1 - offset));
10568                         }
10569                         selector = &sack_array[tsn_map];
10570                         if (mergeable && selector->right_edge) {
10571                                 /*
10572                                  * Backup, left and right edges were ok to
10573                                  * merge.
10574                                  */
10575                                 num_gap_blocks--;
10576                                 gap_descriptor--;
10577                         }
10578                         if (selector->num_entries == 0)
10579                                 mergeable = 0;
10580                         else {
10581                                 for (j = 0; j < selector->num_entries; j++) {
10582                                         if (mergeable && selector->right_edge) {
10583                                                 /*
10584                                                  * do a merge by NOT setting
10585                                                  * the left side
10586                                                  */
10587                                                 mergeable = 0;
10588                                         } else {
10589                                                 /*
10590                                                  * no merge, set the left
10591                                                  * side
10592                                                  */
10593                                                 mergeable = 0;
10594                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10595                                         }
10596                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10597                                         num_gap_blocks++;
10598                                         gap_descriptor++;
10599                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10600                                                 /* no more room */
10601                                                 limit_reached = 1;
10602                                                 break;
10603                                         }
10604                                 }
10605                                 if (selector->left_edge) {
10606                                         mergeable = 1;
10607                                 }
10608                         }
10609                         if (limit_reached) {
10610                                 /* Reached the limit stop */
10611                                 break;
10612                         }
10613                         offset += 8;
10614                 }
10615         }
10616         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10617             (limit_reached == 0)) {
10618
10619                 mergeable = 0;
10620
10621                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10622                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10623                 } else {
10624                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10625                 }
10626
10627                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10628                         offset = 1;
10629                 } else {
10630                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10631                 }
10632                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10633                         /* we have a gap .. maybe */
10634                         for (i = 0; i < siz; i++) {
10635                                 tsn_map = asoc->nr_mapping_array[i];
10636                                 if (i == 0) {
10637                                         /*
10638                                          * Clear all bits corresponding to
10639                                          * TSNs smaller or equal to the
10640                                          * cumulative TSN.
10641                                          */
10642                                         tsn_map &= (~0 << (1 - offset));
10643                                 }
10644                                 selector = &sack_array[tsn_map];
10645                                 if (mergeable && selector->right_edge) {
10646                                         /*
10647                                          * Backup, left and right edges were
10648                                          * ok to merge.
10649                                          */
10650                                         num_nr_gap_blocks--;
10651                                         gap_descriptor--;
10652                                 }
10653                                 if (selector->num_entries == 0)
10654                                         mergeable = 0;
10655                                 else {
10656                                         for (j = 0; j < selector->num_entries; j++) {
10657                                                 if (mergeable && selector->right_edge) {
10658                                                         /*
10659                                                          * do a merge by NOT
10660                                                          * setting the left
10661                                                          * side
10662                                                          */
10663                                                         mergeable = 0;
10664                                                 } else {
10665                                                         /*
10666                                                          * no merge, set the
10667                                                          * left side
10668                                                          */
10669                                                         mergeable = 0;
10670                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10671                                                 }
10672                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10673                                                 num_nr_gap_blocks++;
10674                                                 gap_descriptor++;
10675                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10676                                                         /* no more room */
10677                                                         limit_reached = 1;
10678                                                         break;
10679                                                 }
10680                                         }
10681                                         if (selector->left_edge) {
10682                                                 mergeable = 1;
10683                                         }
10684                                 }
10685                                 if (limit_reached) {
10686                                         /* Reached the limit stop */
10687                                         break;
10688                                 }
10689                                 offset += 8;
10690                         }
10691                 }
10692         }
10693         /* now we must add any dups we are going to report. */
10694         if ((limit_reached == 0) && (asoc->numduptsns)) {
10695                 dup = (uint32_t *) gap_descriptor;
10696                 for (i = 0; i < asoc->numduptsns; i++) {
10697                         *dup = htonl(asoc->dup_tsns[i]);
10698                         dup++;
10699                         num_dups++;
10700                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10701                                 /* no more room */
10702                                 break;
10703                         }
10704                 }
10705                 asoc->numduptsns = 0;
10706         }
10707         /*
10708          * now that the chunk is prepared queue it to the control chunk
10709          * queue.
10710          */
10711         if (type == SCTP_SELECTIVE_ACK) {
10712                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10713                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10714                     num_dups * sizeof(int32_t);
10715                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10716                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10717                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10718                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10719                 sack->sack.num_dup_tsns = htons(num_dups);
10720                 sack->ch.chunk_type = type;
10721                 sack->ch.chunk_flags = flags;
10722                 sack->ch.chunk_length = htons(a_chk->send_size);
10723         } else {
10724                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10725                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10726                     num_dups * sizeof(int32_t);
10727                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10728                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10729                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10730                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10731                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10732                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10733                 nr_sack->nr_sack.reserved = 0;
10734                 nr_sack->ch.chunk_type = type;
10735                 nr_sack->ch.chunk_flags = flags;
10736                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10737         }
10738         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10739         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10740         asoc->ctrl_queue_cnt++;
10741         asoc->send_sack = 0;
10742         SCTP_STAT_INCR(sctps_sendsacks);
10743         return;
10744 }
10745
10746 void
10747 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10748 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10749     SCTP_UNUSED
10750 #endif
10751 )
10752 {
10753         struct mbuf *m_abort;
10754         struct mbuf *m_out = NULL, *m_end = NULL;
10755         struct sctp_abort_chunk *abort = NULL;
10756         int sz;
10757         uint32_t auth_offset = 0;
10758         struct sctp_auth_chunk *auth = NULL;
10759         struct sctp_nets *net;
10760
10761         /*-
10762          * Add an AUTH chunk, if chunk requires it and save the offset into
10763          * the chain for AUTH
10764          */
10765         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10766             stcb->asoc.peer_auth_chunks)) {
10767                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10768                     stcb, SCTP_ABORT_ASSOCIATION);
10769                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10770         }
10771         SCTP_TCB_LOCK_ASSERT(stcb);
10772         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10773         if (m_abort == NULL) {
10774                 /* no mbuf's */
10775                 if (m_out)
10776                         sctp_m_freem(m_out);
10777                 return;
10778         }
10779         /* link in any error */
10780         SCTP_BUF_NEXT(m_abort) = operr;
10781         sz = 0;
10782         if (operr) {
10783                 struct mbuf *n;
10784
10785                 n = operr;
10786                 while (n) {
10787                         sz += SCTP_BUF_LEN(n);
10788                         n = SCTP_BUF_NEXT(n);
10789                 }
10790         }
10791         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10792         if (m_out == NULL) {
10793                 /* NO Auth chunk prepended, so reserve space in front */
10794                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10795                 m_out = m_abort;
10796         } else {
10797                 /* Put AUTH chunk at the front of the chain */
10798                 SCTP_BUF_NEXT(m_end) = m_abort;
10799         }
10800         if (stcb->asoc.alternate) {
10801                 net = stcb->asoc.alternate;
10802         } else {
10803                 net = stcb->asoc.primary_destination;
10804         }
10805         /* fill in the ABORT chunk */
10806         abort = mtod(m_abort, struct sctp_abort_chunk *);
10807         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10808         abort->ch.chunk_flags = 0;
10809         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10810
10811         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10812             (struct sockaddr *)&net->ro._l_addr,
10813             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10814             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10815             stcb->asoc.primary_destination->port, so_locked, NULL, NULL);
10816         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10817 }
10818
10819 void
10820 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10821     struct sctp_nets *net,
10822     int reflect_vtag)
10823 {
10824         /* formulate and SEND a SHUTDOWN-COMPLETE */
10825         struct mbuf *m_shutdown_comp;
10826         struct sctp_shutdown_complete_chunk *shutdown_complete;
10827         uint32_t vtag;
10828         uint8_t flags;
10829
10830         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10831         if (m_shutdown_comp == NULL) {
10832                 /* no mbuf's */
10833                 return;
10834         }
10835         if (reflect_vtag) {
10836                 flags = SCTP_HAD_NO_TCB;
10837                 vtag = stcb->asoc.my_vtag;
10838         } else {
10839                 flags = 0;
10840                 vtag = stcb->asoc.peer_vtag;
10841         }
10842         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10843         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10844         shutdown_complete->ch.chunk_flags = flags;
10845         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10846         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10847         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10848             (struct sockaddr *)&net->ro._l_addr,
10849             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10850             stcb->sctp_ep->sctp_lport, stcb->rport,
10851             htonl(vtag),
10852             net->port, SCTP_SO_NOT_LOCKED, NULL, NULL);
10853         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10854         return;
10855 }
10856
10857 void
10858 sctp_send_shutdown_complete2(struct mbuf *m, struct sctphdr *sh,
10859     uint32_t vrf_id, uint16_t port)
10860 {
10861         /* formulate and SEND a SHUTDOWN-COMPLETE */
10862         struct mbuf *o_pak;
10863         struct mbuf *mout;
10864         struct ip *iph;
10865         struct udphdr *udp = NULL;
10866         int offset_out, len, mlen;
10867         struct sctp_shutdown_complete_msg *comp_cp;
10868
10869 #ifdef INET
10870         struct ip *iph_out;
10871
10872 #endif
10873 #ifdef INET6
10874         struct ip6_hdr *ip6, *ip6_out;
10875
10876 #endif
10877
10878         iph = mtod(m, struct ip *);
10879         switch (iph->ip_v) {
10880 #ifdef INET
10881         case IPVERSION:
10882                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10883                 break;
10884 #endif
10885 #ifdef INET6
10886         case IPV6_VERSION >> 4:
10887                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10888                 break;
10889 #endif
10890         default:
10891                 return;
10892         }
10893         if (port) {
10894                 len += sizeof(struct udphdr);
10895         }
10896         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10897         if (mout == NULL) {
10898                 return;
10899         }
10900         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10901         SCTP_BUF_LEN(mout) = len;
10902         SCTP_BUF_NEXT(mout) = NULL;
10903         if (m->m_flags & M_FLOWID) {
10904                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
10905                 mout->m_flags |= M_FLOWID;
10906         }
10907 #ifdef INET
10908         iph_out = NULL;
10909 #endif
10910 #ifdef INET6
10911         ip6_out = NULL;
10912 #endif
10913         offset_out = 0;
10914
10915         switch (iph->ip_v) {
10916 #ifdef INET
10917         case IPVERSION:
10918                 iph_out = mtod(mout, struct ip *);
10919
10920                 /* Fill in the IP header for the ABORT */
10921                 iph_out->ip_v = IPVERSION;
10922                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10923                 iph_out->ip_tos = (u_char)0;
10924                 iph_out->ip_id = 0;
10925                 iph_out->ip_off = 0;
10926                 iph_out->ip_ttl = MAXTTL;
10927                 if (port) {
10928                         iph_out->ip_p = IPPROTO_UDP;
10929                 } else {
10930                         iph_out->ip_p = IPPROTO_SCTP;
10931                 }
10932                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10933                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10934
10935                 /* let IP layer calculate this */
10936                 iph_out->ip_sum = 0;
10937                 offset_out += sizeof(*iph_out);
10938                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10939                     (caddr_t)iph_out + offset_out);
10940                 break;
10941 #endif
10942 #ifdef INET6
10943         case IPV6_VERSION >> 4:
10944                 ip6 = (struct ip6_hdr *)iph;
10945                 ip6_out = mtod(mout, struct ip6_hdr *);
10946
10947                 /* Fill in the IPv6 header for the ABORT */
10948                 ip6_out->ip6_flow = ip6->ip6_flow;
10949                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10950                 if (port) {
10951                         ip6_out->ip6_nxt = IPPROTO_UDP;
10952                 } else {
10953                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10954                 }
10955                 ip6_out->ip6_src = ip6->ip6_dst;
10956                 ip6_out->ip6_dst = ip6->ip6_src;
10957                 /*
10958                  * ?? The old code had both the iph len + payload, I think
10959                  * this is wrong and would never have worked
10960                  */
10961                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10962                 offset_out += sizeof(*ip6_out);
10963                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10964                     (caddr_t)ip6_out + offset_out);
10965                 break;
10966 #endif                          /* INET6 */
10967         default:
10968                 /* Currently not supported. */
10969                 sctp_m_freem(mout);
10970                 return;
10971         }
10972         if (port) {
10973                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10974                         sctp_m_freem(mout);
10975                         return;
10976                 }
10977                 udp = (struct udphdr *)comp_cp;
10978                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10979                 udp->uh_dport = port;
10980                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10981 #ifdef INET
10982                 if (iph_out) {
10983                         if (V_udp_cksum) {
10984                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10985                         } else {
10986                                 udp->uh_sum = 0;
10987                         }
10988                 }
10989 #endif
10990                 offset_out += sizeof(struct udphdr);
10991                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
10992         }
10993         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10994                 /* no mbuf's */
10995                 sctp_m_freem(mout);
10996                 return;
10997         }
10998         /* Now copy in and fill in the ABORT tags etc. */
10999         comp_cp->sh.src_port = sh->dest_port;
11000         comp_cp->sh.dest_port = sh->src_port;
11001         comp_cp->sh.checksum = 0;
11002         comp_cp->sh.v_tag = sh->v_tag;
11003         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
11004         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11005         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11006
11007 #ifdef INET
11008         if (iph_out != NULL) {
11009                 sctp_route_t ro;
11010                 int ret;
11011
11012                 mlen = SCTP_BUF_LEN(mout);
11013                 bzero(&ro, sizeof ro);
11014                 /* set IPv4 length */
11015                 iph_out->ip_len = mlen;
11016 #ifdef  SCTP_PACKET_LOGGING
11017                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11018                         sctp_packet_log(mout, mlen);
11019 #endif
11020                 if (port) {
11021 #if defined(SCTP_WITH_NO_CSUM)
11022                         SCTP_STAT_INCR(sctps_sendnocrc);
11023 #else
11024                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
11025                         SCTP_STAT_INCR(sctps_sendswcrc);
11026 #endif
11027                         if (V_udp_cksum) {
11028                                 SCTP_ENABLE_UDP_CSUM(mout);
11029                         }
11030                 } else {
11031 #if defined(SCTP_WITH_NO_CSUM)
11032                         SCTP_STAT_INCR(sctps_sendnocrc);
11033 #else
11034                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11035                         mout->m_pkthdr.csum_data = 0;
11036                         SCTP_STAT_INCR(sctps_sendhwcrc);
11037 #endif
11038                 }
11039                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11040                 /* out it goes */
11041                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11042
11043                 /* Free the route if we got one back */
11044                 if (ro.ro_rt)
11045                         RTFREE(ro.ro_rt);
11046         }
11047 #endif
11048 #ifdef INET6
11049         if (ip6_out != NULL) {
11050                 int ret;
11051
11052                 mlen = SCTP_BUF_LEN(mout);
11053 #ifdef  SCTP_PACKET_LOGGING
11054                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11055                         sctp_packet_log(mout, mlen);
11056 #endif
11057                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11058                 if (port) {
11059 #if defined(SCTP_WITH_NO_CSUM)
11060                         SCTP_STAT_INCR(sctps_sendnocrc);
11061 #else
11062                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11063                         SCTP_STAT_INCR(sctps_sendswcrc);
11064 #endif
11065                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
11066                                 udp->uh_sum = 0xffff;
11067                         }
11068                 } else {
11069 #if defined(SCTP_WITH_NO_CSUM)
11070                         SCTP_STAT_INCR(sctps_sendnocrc);
11071 #else
11072                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11073                         mout->m_pkthdr.csum_data = 0;
11074                         SCTP_STAT_INCR(sctps_sendhwcrc);
11075 #endif
11076                 }
11077                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11078         }
11079 #endif
11080         SCTP_STAT_INCR(sctps_sendpackets);
11081         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11082         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11083         return;
11084
11085 }
11086
11087 void
11088 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11089 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11090     SCTP_UNUSED
11091 #endif
11092 )
11093 {
11094         struct sctp_tmit_chunk *chk;
11095         struct sctp_heartbeat_chunk *hb;
11096         struct timeval now;
11097
11098         SCTP_TCB_LOCK_ASSERT(stcb);
11099         if (net == NULL) {
11100                 return;
11101         }
11102         (void)SCTP_GETTIME_TIMEVAL(&now);
11103         switch (net->ro._l_addr.sa.sa_family) {
11104 #ifdef INET
11105         case AF_INET:
11106                 break;
11107 #endif
11108 #ifdef INET6
11109         case AF_INET6:
11110                 break;
11111 #endif
11112         default:
11113                 return;
11114         }
11115         sctp_alloc_a_chunk(stcb, chk);
11116         if (chk == NULL) {
11117                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11118                 return;
11119         }
11120         chk->copy_by_ref = 0;
11121         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11122         chk->rec.chunk_id.can_take_data = 1;
11123         chk->asoc = &stcb->asoc;
11124         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11125
11126         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11127         if (chk->data == NULL) {
11128                 sctp_free_a_chunk(stcb, chk, so_locked);
11129                 return;
11130         }
11131         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11132         SCTP_BUF_LEN(chk->data) = chk->send_size;
11133         chk->sent = SCTP_DATAGRAM_UNSENT;
11134         chk->snd_count = 0;
11135         chk->whoTo = net;
11136         atomic_add_int(&chk->whoTo->ref_count, 1);
11137         /* Now we have a mbuf that we can fill in with the details */
11138         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11139         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11140         /* fill out chunk header */
11141         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11142         hb->ch.chunk_flags = 0;
11143         hb->ch.chunk_length = htons(chk->send_size);
11144         /* Fill out hb parameter */
11145         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11146         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11147         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11148         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11149         /* Did our user request this one, put it in */
11150         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11151         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11152         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11153                 /*
11154                  * we only take from the entropy pool if the address is not
11155                  * confirmed.
11156                  */
11157                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11158                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11159         } else {
11160                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11161                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11162         }
11163         switch (net->ro._l_addr.sa.sa_family) {
11164 #ifdef INET
11165         case AF_INET:
11166                 memcpy(hb->heartbeat.hb_info.address,
11167                     &net->ro._l_addr.sin.sin_addr,
11168                     sizeof(net->ro._l_addr.sin.sin_addr));
11169                 break;
11170 #endif
11171 #ifdef INET6
11172         case AF_INET6:
11173                 memcpy(hb->heartbeat.hb_info.address,
11174                     &net->ro._l_addr.sin6.sin6_addr,
11175                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11176                 break;
11177 #endif
11178         default:
11179                 return;
11180                 break;
11181         }
11182         net->hb_responded = 0;
11183         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11184         stcb->asoc.ctrl_queue_cnt++;
11185         SCTP_STAT_INCR(sctps_sendheartbeat);
11186         return;
11187 }
11188
11189 void
11190 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11191     uint32_t high_tsn)
11192 {
11193         struct sctp_association *asoc;
11194         struct sctp_ecne_chunk *ecne;
11195         struct sctp_tmit_chunk *chk;
11196
11197         if (net == NULL) {
11198                 return;
11199         }
11200         asoc = &stcb->asoc;
11201         SCTP_TCB_LOCK_ASSERT(stcb);
11202         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11203                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11204                         /* found a previous ECN_ECHO update it if needed */
11205                         uint32_t cnt, ctsn;
11206
11207                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11208                         ctsn = ntohl(ecne->tsn);
11209                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11210                                 ecne->tsn = htonl(high_tsn);
11211                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11212                         }
11213                         cnt = ntohl(ecne->num_pkts_since_cwr);
11214                         cnt++;
11215                         ecne->num_pkts_since_cwr = htonl(cnt);
11216                         return;
11217                 }
11218         }
11219         /* nope could not find one to update so we must build one */
11220         sctp_alloc_a_chunk(stcb, chk);
11221         if (chk == NULL) {
11222                 return;
11223         }
11224         chk->copy_by_ref = 0;
11225         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11226         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11227         chk->rec.chunk_id.can_take_data = 0;
11228         chk->asoc = &stcb->asoc;
11229         chk->send_size = sizeof(struct sctp_ecne_chunk);
11230         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11231         if (chk->data == NULL) {
11232                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11233                 return;
11234         }
11235         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11236         SCTP_BUF_LEN(chk->data) = chk->send_size;
11237         chk->sent = SCTP_DATAGRAM_UNSENT;
11238         chk->snd_count = 0;
11239         chk->whoTo = net;
11240         atomic_add_int(&chk->whoTo->ref_count, 1);
11241
11242         stcb->asoc.ecn_echo_cnt_onq++;
11243         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11244         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11245         ecne->ch.chunk_flags = 0;
11246         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11247         ecne->tsn = htonl(high_tsn);
11248         ecne->num_pkts_since_cwr = htonl(1);
11249         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11250         asoc->ctrl_queue_cnt++;
11251 }
11252
11253 void
11254 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11255     struct mbuf *m, int iphlen, int bad_crc)
11256 {
11257         struct sctp_association *asoc;
11258         struct sctp_pktdrop_chunk *drp;
11259         struct sctp_tmit_chunk *chk;
11260         uint8_t *datap;
11261         int len;
11262         int was_trunc = 0;
11263         struct ip *iph;
11264
11265 #ifdef INET6
11266         struct ip6_hdr *ip6h;
11267
11268 #endif
11269         int fullsz = 0, extra = 0;
11270         long spc;
11271         int offset;
11272         struct sctp_chunkhdr *ch, chunk_buf;
11273         unsigned int chk_length;
11274
11275         if (!stcb) {
11276                 return;
11277         }
11278         asoc = &stcb->asoc;
11279         SCTP_TCB_LOCK_ASSERT(stcb);
11280         if (asoc->peer_supports_pktdrop == 0) {
11281                 /*-
11282                  * peer must declare support before I send one.
11283                  */
11284                 return;
11285         }
11286         if (stcb->sctp_socket == NULL) {
11287                 return;
11288         }
11289         sctp_alloc_a_chunk(stcb, chk);
11290         if (chk == NULL) {
11291                 return;
11292         }
11293         chk->copy_by_ref = 0;
11294         iph = mtod(m, struct ip *);
11295         if (iph == NULL) {
11296                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11297                 return;
11298         }
11299         switch (iph->ip_v) {
11300 #ifdef INET
11301         case IPVERSION:
11302                 /* IPv4 */
11303                 len = chk->send_size = iph->ip_len;
11304                 break;
11305 #endif
11306 #ifdef INET6
11307         case IPV6_VERSION >> 4:
11308                 /* IPv6 */
11309                 ip6h = mtod(m, struct ip6_hdr *);
11310                 len = chk->send_size = htons(ip6h->ip6_plen);
11311                 break;
11312 #endif
11313         default:
11314                 return;
11315         }
11316         /* Validate that we do not have an ABORT in here. */
11317         offset = iphlen + sizeof(struct sctphdr);
11318         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11319             sizeof(*ch), (uint8_t *) & chunk_buf);
11320         while (ch != NULL) {
11321                 chk_length = ntohs(ch->chunk_length);
11322                 if (chk_length < sizeof(*ch)) {
11323                         /* break to abort land */
11324                         break;
11325                 }
11326                 switch (ch->chunk_type) {
11327                 case SCTP_PACKET_DROPPED:
11328                 case SCTP_ABORT_ASSOCIATION:
11329                 case SCTP_INITIATION_ACK:
11330                         /**
11331                          * We don't respond with an PKT-DROP to an ABORT
11332                          * or PKT-DROP. We also do not respond to an
11333                          * INIT-ACK, because we can't know if the initiation
11334                          * tag is correct or not.
11335                          */
11336                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11337                         return;
11338                 default:
11339                         break;
11340                 }
11341                 offset += SCTP_SIZE32(chk_length);
11342                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11343                     sizeof(*ch), (uint8_t *) & chunk_buf);
11344         }
11345
11346         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11347             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11348                 /*
11349                  * only send 1 mtu worth, trim off the excess on the end.
11350                  */
11351                 fullsz = len - extra;
11352                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11353                 was_trunc = 1;
11354         }
11355         chk->asoc = &stcb->asoc;
11356         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11357         if (chk->data == NULL) {
11358 jump_out:
11359                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11360                 return;
11361         }
11362         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11363         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11364         if (drp == NULL) {
11365                 sctp_m_freem(chk->data);
11366                 chk->data = NULL;
11367                 goto jump_out;
11368         }
11369         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11370             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11371         chk->book_size_scale = 0;
11372         if (was_trunc) {
11373                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11374                 drp->trunc_len = htons(fullsz);
11375                 /*
11376                  * Len is already adjusted to size minus overhead above take
11377                  * out the pkt_drop chunk itself from it.
11378                  */
11379                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11380                 len = chk->send_size;
11381         } else {
11382                 /* no truncation needed */
11383                 drp->ch.chunk_flags = 0;
11384                 drp->trunc_len = htons(0);
11385         }
11386         if (bad_crc) {
11387                 drp->ch.chunk_flags |= SCTP_BADCRC;
11388         }
11389         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11390         SCTP_BUF_LEN(chk->data) = chk->send_size;
11391         chk->sent = SCTP_DATAGRAM_UNSENT;
11392         chk->snd_count = 0;
11393         if (net) {
11394                 /* we should hit here */
11395                 chk->whoTo = net;
11396                 atomic_add_int(&chk->whoTo->ref_count, 1);
11397         } else {
11398                 chk->whoTo = NULL;
11399         }
11400         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11401         chk->rec.chunk_id.can_take_data = 1;
11402         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11403         drp->ch.chunk_length = htons(chk->send_size);
11404         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11405         if (spc < 0) {
11406                 spc = 0;
11407         }
11408         drp->bottle_bw = htonl(spc);
11409         if (asoc->my_rwnd) {
11410                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11411                     asoc->size_on_all_streams +
11412                     asoc->my_rwnd_control_len +
11413                     stcb->sctp_socket->so_rcv.sb_cc);
11414         } else {
11415                 /*-
11416                  * If my rwnd is 0, possibly from mbuf depletion as well as
11417                  * space used, tell the peer there is NO space aka onq == bw
11418                  */
11419                 drp->current_onq = htonl(spc);
11420         }
11421         drp->reserved = 0;
11422         datap = drp->data;
11423         m_copydata(m, iphlen, len, (caddr_t)datap);
11424         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11425         asoc->ctrl_queue_cnt++;
11426 }
11427
11428 void
11429 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11430 {
11431         struct sctp_association *asoc;
11432         struct sctp_cwr_chunk *cwr;
11433         struct sctp_tmit_chunk *chk;
11434
11435         asoc = &stcb->asoc;
11436         SCTP_TCB_LOCK_ASSERT(stcb);
11437         if (net == NULL) {
11438                 return;
11439         }
11440         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11441                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11442                         /*
11443                          * found a previous CWR queued to same destination
11444                          * update it if needed
11445                          */
11446                         uint32_t ctsn;
11447
11448                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11449                         ctsn = ntohl(cwr->tsn);
11450                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11451                                 cwr->tsn = htonl(high_tsn);
11452                         }
11453                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11454                                 /* Make sure override is carried */
11455                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11456                         }
11457                         return;
11458                 }
11459         }
11460         sctp_alloc_a_chunk(stcb, chk);
11461         if (chk == NULL) {
11462                 return;
11463         }
11464         chk->copy_by_ref = 0;
11465         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11466         chk->rec.chunk_id.can_take_data = 1;
11467         chk->asoc = &stcb->asoc;
11468         chk->send_size = sizeof(struct sctp_cwr_chunk);
11469         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11470         if (chk->data == NULL) {
11471                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11472                 return;
11473         }
11474         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11475         SCTP_BUF_LEN(chk->data) = chk->send_size;
11476         chk->sent = SCTP_DATAGRAM_UNSENT;
11477         chk->snd_count = 0;
11478         chk->whoTo = net;
11479         atomic_add_int(&chk->whoTo->ref_count, 1);
11480         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11481         cwr->ch.chunk_type = SCTP_ECN_CWR;
11482         cwr->ch.chunk_flags = override;
11483         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11484         cwr->tsn = htonl(high_tsn);
11485         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11486         asoc->ctrl_queue_cnt++;
11487 }
11488
11489 void
11490 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11491     int number_entries, uint16_t * list,
11492     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11493 {
11494         int len, old_len, i;
11495         struct sctp_stream_reset_out_request *req_out;
11496         struct sctp_chunkhdr *ch;
11497
11498         ch = mtod(chk->data, struct sctp_chunkhdr *);
11499
11500
11501         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11502
11503         /* get to new offset for the param. */
11504         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11505         /* now how long will this param be? */
11506         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11507         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11508         req_out->ph.param_length = htons(len);
11509         req_out->request_seq = htonl(seq);
11510         req_out->response_seq = htonl(resp_seq);
11511         req_out->send_reset_at_tsn = htonl(last_sent);
11512         if (number_entries) {
11513                 for (i = 0; i < number_entries; i++) {
11514                         req_out->list_of_streams[i] = htons(list[i]);
11515                 }
11516         }
11517         if (SCTP_SIZE32(len) > len) {
11518                 /*-
11519                  * Need to worry about the pad we may end up adding to the
11520                  * end. This is easy since the struct is either aligned to 4
11521                  * bytes or 2 bytes off.
11522                  */
11523                 req_out->list_of_streams[number_entries] = 0;
11524         }
11525         /* now fix the chunk length */
11526         ch->chunk_length = htons(len + old_len);
11527         chk->book_size = len + old_len;
11528         chk->book_size_scale = 0;
11529         chk->send_size = SCTP_SIZE32(chk->book_size);
11530         SCTP_BUF_LEN(chk->data) = chk->send_size;
11531         return;
11532 }
11533
11534
11535 void
11536 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11537     int number_entries, uint16_t * list,
11538     uint32_t seq)
11539 {
11540         int len, old_len, i;
11541         struct sctp_stream_reset_in_request *req_in;
11542         struct sctp_chunkhdr *ch;
11543
11544         ch = mtod(chk->data, struct sctp_chunkhdr *);
11545
11546
11547         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11548
11549         /* get to new offset for the param. */
11550         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11551         /* now how long will this param be? */
11552         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11553         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11554         req_in->ph.param_length = htons(len);
11555         req_in->request_seq = htonl(seq);
11556         if (number_entries) {
11557                 for (i = 0; i < number_entries; i++) {
11558                         req_in->list_of_streams[i] = htons(list[i]);
11559                 }
11560         }
11561         if (SCTP_SIZE32(len) > len) {
11562                 /*-
11563                  * Need to worry about the pad we may end up adding to the
11564                  * end. This is easy since the struct is either aligned to 4
11565                  * bytes or 2 bytes off.
11566                  */
11567                 req_in->list_of_streams[number_entries] = 0;
11568         }
11569         /* now fix the chunk length */
11570         ch->chunk_length = htons(len + old_len);
11571         chk->book_size = len + old_len;
11572         chk->book_size_scale = 0;
11573         chk->send_size = SCTP_SIZE32(chk->book_size);
11574         SCTP_BUF_LEN(chk->data) = chk->send_size;
11575         return;
11576 }
11577
11578
11579 void
11580 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11581     uint32_t seq)
11582 {
11583         int len, old_len;
11584         struct sctp_stream_reset_tsn_request *req_tsn;
11585         struct sctp_chunkhdr *ch;
11586
11587         ch = mtod(chk->data, struct sctp_chunkhdr *);
11588
11589
11590         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11591
11592         /* get to new offset for the param. */
11593         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11594         /* now how long will this param be? */
11595         len = sizeof(struct sctp_stream_reset_tsn_request);
11596         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11597         req_tsn->ph.param_length = htons(len);
11598         req_tsn->request_seq = htonl(seq);
11599
11600         /* now fix the chunk length */
11601         ch->chunk_length = htons(len + old_len);
11602         chk->send_size = len + old_len;
11603         chk->book_size = SCTP_SIZE32(chk->send_size);
11604         chk->book_size_scale = 0;
11605         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11606         return;
11607 }
11608
11609 void
11610 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11611     uint32_t resp_seq, uint32_t result)
11612 {
11613         int len, old_len;
11614         struct sctp_stream_reset_response *resp;
11615         struct sctp_chunkhdr *ch;
11616
11617         ch = mtod(chk->data, struct sctp_chunkhdr *);
11618
11619
11620         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11621
11622         /* get to new offset for the param. */
11623         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11624         /* now how long will this param be? */
11625         len = sizeof(struct sctp_stream_reset_response);
11626         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11627         resp->ph.param_length = htons(len);
11628         resp->response_seq = htonl(resp_seq);
11629         resp->result = ntohl(result);
11630
11631         /* now fix the chunk length */
11632         ch->chunk_length = htons(len + old_len);
11633         chk->book_size = len + old_len;
11634         chk->book_size_scale = 0;
11635         chk->send_size = SCTP_SIZE32(chk->book_size);
11636         SCTP_BUF_LEN(chk->data) = chk->send_size;
11637         return;
11638
11639 }
11640
11641
11642 void
11643 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11644     uint32_t resp_seq, uint32_t result,
11645     uint32_t send_una, uint32_t recv_next)
11646 {
11647         int len, old_len;
11648         struct sctp_stream_reset_response_tsn *resp;
11649         struct sctp_chunkhdr *ch;
11650
11651         ch = mtod(chk->data, struct sctp_chunkhdr *);
11652
11653
11654         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11655
11656         /* get to new offset for the param. */
11657         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11658         /* now how long will this param be? */
11659         len = sizeof(struct sctp_stream_reset_response_tsn);
11660         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11661         resp->ph.param_length = htons(len);
11662         resp->response_seq = htonl(resp_seq);
11663         resp->result = htonl(result);
11664         resp->senders_next_tsn = htonl(send_una);
11665         resp->receivers_next_tsn = htonl(recv_next);
11666
11667         /* now fix the chunk length */
11668         ch->chunk_length = htons(len + old_len);
11669         chk->book_size = len + old_len;
11670         chk->send_size = SCTP_SIZE32(chk->book_size);
11671         chk->book_size_scale = 0;
11672         SCTP_BUF_LEN(chk->data) = chk->send_size;
11673         return;
11674 }
11675
11676 static void
11677 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11678     uint32_t seq,
11679     uint16_t adding)
11680 {
11681         int len, old_len;
11682         struct sctp_chunkhdr *ch;
11683         struct sctp_stream_reset_add_strm *addstr;
11684
11685         ch = mtod(chk->data, struct sctp_chunkhdr *);
11686         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11687
11688         /* get to new offset for the param. */
11689         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11690         /* now how long will this param be? */
11691         len = sizeof(struct sctp_stream_reset_add_strm);
11692
11693         /* Fill it out. */
11694         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11695         addstr->ph.param_length = htons(len);
11696         addstr->request_seq = htonl(seq);
11697         addstr->number_of_streams = htons(adding);
11698         addstr->reserved = 0;
11699
11700         /* now fix the chunk length */
11701         ch->chunk_length = htons(len + old_len);
11702         chk->send_size = len + old_len;
11703         chk->book_size = SCTP_SIZE32(chk->send_size);
11704         chk->book_size_scale = 0;
11705         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11706         return;
11707 }
11708
11709 static void
11710 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11711     uint32_t seq,
11712     uint16_t adding)
11713 {
11714         int len, old_len;
11715         struct sctp_chunkhdr *ch;
11716         struct sctp_stream_reset_add_strm *addstr;
11717
11718         ch = mtod(chk->data, struct sctp_chunkhdr *);
11719         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11720
11721         /* get to new offset for the param. */
11722         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11723         /* now how long will this param be? */
11724         len = sizeof(struct sctp_stream_reset_add_strm);
11725         /* Fill it out. */
11726         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11727         addstr->ph.param_length = htons(len);
11728         addstr->request_seq = htonl(seq);
11729         addstr->number_of_streams = htons(adding);
11730         addstr->reserved = 0;
11731
11732         /* now fix the chunk length */
11733         ch->chunk_length = htons(len + old_len);
11734         chk->send_size = len + old_len;
11735         chk->book_size = SCTP_SIZE32(chk->send_size);
11736         chk->book_size_scale = 0;
11737         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11738         return;
11739 }
11740
11741
11742
11743 int
11744 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11745     int number_entries, uint16_t * list,
11746     uint8_t send_out_req,
11747     uint8_t send_in_req,
11748     uint8_t send_tsn_req,
11749     uint8_t add_stream,
11750     uint16_t adding_o,
11751     uint16_t adding_i, uint8_t peer_asked
11752 )
11753 {
11754
11755         struct sctp_association *asoc;
11756         struct sctp_tmit_chunk *chk;
11757         struct sctp_chunkhdr *ch;
11758         uint32_t seq;
11759
11760         asoc = &stcb->asoc;
11761         if (asoc->stream_reset_outstanding) {
11762                 /*-
11763                  * Already one pending, must get ACK back to clear the flag.
11764                  */
11765                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11766                 return (EBUSY);
11767         }
11768         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11769             (add_stream == 0)) {
11770                 /* nothing to do */
11771                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11772                 return (EINVAL);
11773         }
11774         if (send_tsn_req && (send_out_req || send_in_req)) {
11775                 /* error, can't do that */
11776                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11777                 return (EINVAL);
11778         }
11779         sctp_alloc_a_chunk(stcb, chk);
11780         if (chk == NULL) {
11781                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11782                 return (ENOMEM);
11783         }
11784         chk->copy_by_ref = 0;
11785         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11786         chk->rec.chunk_id.can_take_data = 0;
11787         chk->asoc = &stcb->asoc;
11788         chk->book_size = sizeof(struct sctp_chunkhdr);
11789         chk->send_size = SCTP_SIZE32(chk->book_size);
11790         chk->book_size_scale = 0;
11791
11792         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11793         if (chk->data == NULL) {
11794                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11795                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11796                 return (ENOMEM);
11797         }
11798         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11799
11800         /* setup chunk parameters */
11801         chk->sent = SCTP_DATAGRAM_UNSENT;
11802         chk->snd_count = 0;
11803         if (stcb->asoc.alternate) {
11804                 chk->whoTo = stcb->asoc.alternate;
11805         } else {
11806                 chk->whoTo = stcb->asoc.primary_destination;
11807         }
11808         atomic_add_int(&chk->whoTo->ref_count, 1);
11809         ch = mtod(chk->data, struct sctp_chunkhdr *);
11810         ch->chunk_type = SCTP_STREAM_RESET;
11811         ch->chunk_flags = 0;
11812         ch->chunk_length = htons(chk->book_size);
11813         SCTP_BUF_LEN(chk->data) = chk->send_size;
11814
11815         seq = stcb->asoc.str_reset_seq_out;
11816         if (send_out_req) {
11817                 sctp_add_stream_reset_out(chk, number_entries, list,
11818                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11819                 asoc->stream_reset_out_is_outstanding = 1;
11820                 seq++;
11821                 asoc->stream_reset_outstanding++;
11822         }
11823         if ((add_stream & 1) &&
11824             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11825                 /* Need to allocate more */
11826                 struct sctp_stream_out *oldstream;
11827                 struct sctp_stream_queue_pending *sp, *nsp;
11828                 int i;
11829
11830                 oldstream = stcb->asoc.strmout;
11831                 /* get some more */
11832                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11833                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11834                     SCTP_M_STRMO);
11835                 if (stcb->asoc.strmout == NULL) {
11836                         uint8_t x;
11837
11838                         stcb->asoc.strmout = oldstream;
11839                         /* Turn off the bit */
11840                         x = add_stream & 0xfe;
11841                         add_stream = x;
11842                         goto skip_stuff;
11843                 }
11844                 /*
11845                  * Ok now we proceed with copying the old out stuff and
11846                  * initializing the new stuff.
11847                  */
11848                 SCTP_TCB_SEND_LOCK(stcb);
11849                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11850                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11851                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11852                         stcb->asoc.strmout[i].next_sequence_sent = oldstream[i].next_sequence_sent;
11853                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11854                         stcb->asoc.strmout[i].stream_no = i;
11855                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11856                         /* now anything on those queues? */
11857                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11858                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11859                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11860                         }
11861                         /* Now move assoc pointers too */
11862                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11863                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11864                         }
11865                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11866                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11867                         }
11868                 }
11869                 /* now the new streams */
11870                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11871                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11872                         stcb->asoc.strmout[i].next_sequence_sent = 0x0;
11873                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11874                         stcb->asoc.strmout[i].stream_no = i;
11875                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11876                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11877                 }
11878                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11879                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11880                 SCTP_TCB_SEND_UNLOCK(stcb);
11881         }
11882 skip_stuff:
11883         if ((add_stream & 1) && (adding_o > 0)) {
11884                 asoc->strm_pending_add_size = adding_o;
11885                 asoc->peer_req_out = peer_asked;
11886                 sctp_add_an_out_stream(chk, seq, adding_o);
11887                 seq++;
11888                 asoc->stream_reset_outstanding++;
11889         }
11890         if ((add_stream & 2) && (adding_i > 0)) {
11891                 sctp_add_an_in_stream(chk, seq, adding_i);
11892                 seq++;
11893                 asoc->stream_reset_outstanding++;
11894         }
11895         if (send_in_req) {
11896                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11897                 seq++;
11898                 asoc->stream_reset_outstanding++;
11899         }
11900         if (send_tsn_req) {
11901                 sctp_add_stream_reset_tsn(chk, seq);
11902                 asoc->stream_reset_outstanding++;
11903         }
11904         asoc->str_reset = chk;
11905         /* insert the chunk for sending */
11906         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11907             chk,
11908             sctp_next);
11909         asoc->ctrl_queue_cnt++;
11910         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11911         return (0);
11912 }
11913
11914 void
11915 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11916     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11917 {
11918         /*-
11919          * Formulate the abort message, and send it back down.
11920          */
11921         struct mbuf *o_pak;
11922         struct mbuf *mout;
11923         struct sctp_abort_msg *abm;
11924         struct ip *iph;
11925         struct udphdr *udp;
11926         int iphlen_out, len;
11927
11928 #ifdef INET
11929         struct ip *iph_out;
11930
11931 #endif
11932 #ifdef INET6
11933         struct ip6_hdr *ip6, *ip6_out;
11934
11935 #endif
11936
11937         /* don't respond to ABORT with ABORT */
11938         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11939                 if (err_cause)
11940                         sctp_m_freem(err_cause);
11941                 return;
11942         }
11943         iph = mtod(m, struct ip *);
11944         switch (iph->ip_v) {
11945 #ifdef INET
11946         case IPVERSION:
11947                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11948                 break;
11949 #endif
11950 #ifdef INET6
11951         case IPV6_VERSION >> 4:
11952                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11953                 break;
11954 #endif
11955         default:
11956                 if (err_cause) {
11957                         sctp_m_freem(err_cause);
11958                 }
11959                 return;
11960         }
11961         if (port) {
11962                 len += sizeof(struct udphdr);
11963         }
11964         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11965         if (mout == NULL) {
11966                 if (err_cause) {
11967                         sctp_m_freem(err_cause);
11968                 }
11969                 return;
11970         }
11971         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11972         SCTP_BUF_LEN(mout) = len;
11973         SCTP_BUF_NEXT(mout) = err_cause;
11974         if (m->m_flags & M_FLOWID) {
11975                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
11976                 mout->m_flags |= M_FLOWID;
11977         }
11978 #ifdef INET
11979         iph_out = NULL;
11980 #endif
11981 #ifdef INET6
11982         ip6_out = NULL;
11983 #endif
11984         switch (iph->ip_v) {
11985 #ifdef INET
11986         case IPVERSION:
11987                 iph_out = mtod(mout, struct ip *);
11988
11989                 /* Fill in the IP header for the ABORT */
11990                 iph_out->ip_v = IPVERSION;
11991                 iph_out->ip_hl = (sizeof(struct ip) / 4);
11992                 iph_out->ip_tos = (u_char)0;
11993                 iph_out->ip_id = 0;
11994                 iph_out->ip_off = 0;
11995                 iph_out->ip_ttl = MAXTTL;
11996                 if (port) {
11997                         iph_out->ip_p = IPPROTO_UDP;
11998                 } else {
11999                         iph_out->ip_p = IPPROTO_SCTP;
12000                 }
12001                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12002                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12003                 /* let IP layer calculate this */
12004                 iph_out->ip_sum = 0;
12005
12006                 iphlen_out = sizeof(*iph_out);
12007                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
12008                 break;
12009 #endif
12010 #ifdef INET6
12011         case IPV6_VERSION >> 4:
12012                 ip6 = (struct ip6_hdr *)iph;
12013                 ip6_out = mtod(mout, struct ip6_hdr *);
12014
12015                 /* Fill in the IP6 header for the ABORT */
12016                 ip6_out->ip6_flow = ip6->ip6_flow;
12017                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
12018                 if (port) {
12019                         ip6_out->ip6_nxt = IPPROTO_UDP;
12020                 } else {
12021                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12022                 }
12023                 ip6_out->ip6_src = ip6->ip6_dst;
12024                 ip6_out->ip6_dst = ip6->ip6_src;
12025
12026                 iphlen_out = sizeof(*ip6_out);
12027                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
12028                 break;
12029 #endif                          /* INET6 */
12030         default:
12031                 /* Currently not supported */
12032                 sctp_m_freem(mout);
12033                 return;
12034         }
12035
12036         udp = (struct udphdr *)abm;
12037         if (port) {
12038                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
12039                         sctp_m_freem(mout);
12040                         return;
12041                 }
12042                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12043                 udp->uh_dport = port;
12044                 /* set udp->uh_ulen later */
12045                 udp->uh_sum = 0;
12046                 iphlen_out += sizeof(struct udphdr);
12047                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
12048         }
12049         abm->sh.src_port = sh->dest_port;
12050         abm->sh.dest_port = sh->src_port;
12051         abm->sh.checksum = 0;
12052         if (vtag == 0) {
12053                 abm->sh.v_tag = sh->v_tag;
12054                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
12055         } else {
12056                 abm->sh.v_tag = htonl(vtag);
12057                 abm->msg.ch.chunk_flags = 0;
12058         }
12059         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
12060
12061         if (err_cause) {
12062                 struct mbuf *m_tmp = err_cause;
12063                 int err_len = 0;
12064
12065                 /* get length of the err_cause chain */
12066                 while (m_tmp != NULL) {
12067                         err_len += SCTP_BUF_LEN(m_tmp);
12068                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12069                 }
12070                 len = SCTP_BUF_LEN(mout) + err_len;
12071                 if (err_len % 4) {
12072                         /* need pad at end of chunk */
12073                         uint32_t cpthis = 0;
12074                         int padlen;
12075
12076                         padlen = 4 - (len % 4);
12077                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12078                         len += padlen;
12079                 }
12080                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
12081         } else {
12082                 len = SCTP_BUF_LEN(mout);
12083                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
12084         }
12085
12086         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12087                 /* no mbuf's */
12088                 sctp_m_freem(mout);
12089                 return;
12090         }
12091 #ifdef INET
12092         if (iph_out != NULL) {
12093                 sctp_route_t ro;
12094                 int ret;
12095
12096                 /* zap the stack pointer to the route */
12097                 bzero(&ro, sizeof ro);
12098                 if (port) {
12099                         udp->uh_ulen = htons(len - sizeof(struct ip));
12100                         if (V_udp_cksum) {
12101                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12102                         } else {
12103                                 udp->uh_sum = 0;
12104                         }
12105                 }
12106                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
12107                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
12108                 /* set IPv4 length */
12109                 iph_out->ip_len = len;
12110                 /* out it goes */
12111 #ifdef  SCTP_PACKET_LOGGING
12112                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12113                         sctp_packet_log(mout, len);
12114 #endif
12115                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12116                 if (port) {
12117 #if defined(SCTP_WITH_NO_CSUM)
12118                         SCTP_STAT_INCR(sctps_sendnocrc);
12119 #else
12120                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
12121                         SCTP_STAT_INCR(sctps_sendswcrc);
12122 #endif
12123                         if (V_udp_cksum) {
12124                                 SCTP_ENABLE_UDP_CSUM(o_pak);
12125                         }
12126                 } else {
12127 #if defined(SCTP_WITH_NO_CSUM)
12128                         SCTP_STAT_INCR(sctps_sendnocrc);
12129 #else
12130                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12131                         mout->m_pkthdr.csum_data = 0;
12132                         SCTP_STAT_INCR(sctps_sendhwcrc);
12133 #endif
12134                 }
12135                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12136
12137                 /* Free the route if we got one back */
12138                 if (ro.ro_rt)
12139                         RTFREE(ro.ro_rt);
12140         }
12141 #endif
12142 #ifdef INET6
12143         if (ip6_out != NULL) {
12144                 int ret;
12145
12146                 if (port) {
12147                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12148                 }
12149                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
12150                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
12151                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12152 #ifdef  SCTP_PACKET_LOGGING
12153                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12154                         sctp_packet_log(mout, len);
12155 #endif
12156                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12157                 if (port) {
12158 #if defined(SCTP_WITH_NO_CSUM)
12159                         SCTP_STAT_INCR(sctps_sendnocrc);
12160 #else
12161                         abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12162                         SCTP_STAT_INCR(sctps_sendswcrc);
12163 #endif
12164                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12165                                 udp->uh_sum = 0xffff;
12166                         }
12167                 } else {
12168 #if defined(SCTP_WITH_NO_CSUM)
12169                         SCTP_STAT_INCR(sctps_sendnocrc);
12170 #else
12171                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12172                         mout->m_pkthdr.csum_data = 0;
12173                         SCTP_STAT_INCR(sctps_sendhwcrc);
12174 #endif
12175                 }
12176                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
12177         }
12178 #endif
12179         SCTP_STAT_INCR(sctps_sendpackets);
12180         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12181         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12182 }
12183
12184 void
12185 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
12186     uint32_t vrf_id, uint16_t port)
12187 {
12188         struct mbuf *o_pak;
12189         struct sctphdr *sh, *sh_out;
12190         struct sctp_chunkhdr *ch;
12191         struct ip *iph;
12192         struct udphdr *udp = NULL;
12193         struct mbuf *mout;
12194         int iphlen_out, len;
12195
12196 #ifdef INET
12197         struct ip *iph_out;
12198
12199 #endif
12200 #ifdef INET6
12201         struct ip6_hdr *ip6, *ip6_out;
12202
12203 #endif
12204
12205         iph = mtod(m, struct ip *);
12206         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
12207         switch (iph->ip_v) {
12208 #ifdef INET
12209         case IPVERSION:
12210                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12211                 break;
12212 #endif
12213 #ifdef INET6
12214         case IPV6_VERSION >> 4:
12215                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12216                 break;
12217 #endif
12218         default:
12219                 if (scm) {
12220                         sctp_m_freem(scm);
12221                 }
12222                 return;
12223         }
12224         if (port) {
12225                 len += sizeof(struct udphdr);
12226         }
12227         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
12228         if (mout == NULL) {
12229                 if (scm) {
12230                         sctp_m_freem(scm);
12231                 }
12232                 return;
12233         }
12234         SCTP_BUF_RESV_UF(mout, max_linkhdr);
12235         SCTP_BUF_LEN(mout) = len;
12236         SCTP_BUF_NEXT(mout) = scm;
12237         if (m->m_flags & M_FLOWID) {
12238                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
12239                 mout->m_flags |= M_FLOWID;
12240         }
12241 #ifdef INET
12242         iph_out = NULL;
12243 #endif
12244 #ifdef INET6
12245         ip6_out = NULL;
12246 #endif
12247         switch (iph->ip_v) {
12248 #ifdef INET
12249         case IPVERSION:
12250                 iph_out = mtod(mout, struct ip *);
12251
12252                 /* Fill in the IP header for the ABORT */
12253                 iph_out->ip_v = IPVERSION;
12254                 iph_out->ip_hl = (sizeof(struct ip) / 4);
12255                 iph_out->ip_tos = (u_char)0;
12256                 iph_out->ip_id = 0;
12257                 iph_out->ip_off = 0;
12258                 iph_out->ip_ttl = MAXTTL;
12259                 if (port) {
12260                         iph_out->ip_p = IPPROTO_UDP;
12261                 } else {
12262                         iph_out->ip_p = IPPROTO_SCTP;
12263                 }
12264                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12265                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12266                 /* let IP layer calculate this */
12267                 iph_out->ip_sum = 0;
12268
12269                 iphlen_out = sizeof(struct ip);
12270                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
12271                 break;
12272 #endif
12273 #ifdef INET6
12274         case IPV6_VERSION >> 4:
12275                 ip6 = (struct ip6_hdr *)iph;
12276                 ip6_out = mtod(mout, struct ip6_hdr *);
12277
12278                 /* Fill in the IP6 header for the ABORT */
12279                 ip6_out->ip6_flow = ip6->ip6_flow;
12280                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
12281                 if (port) {
12282                         ip6_out->ip6_nxt = IPPROTO_UDP;
12283                 } else {
12284                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12285                 }
12286                 ip6_out->ip6_src = ip6->ip6_dst;
12287                 ip6_out->ip6_dst = ip6->ip6_src;
12288
12289                 iphlen_out = sizeof(struct ip6_hdr);
12290                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
12291                 break;
12292 #endif                          /* INET6 */
12293         default:
12294                 /* Currently not supported */
12295                 sctp_m_freem(mout);
12296                 return;
12297         }
12298
12299         udp = (struct udphdr *)sh_out;
12300         if (port) {
12301                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
12302                         sctp_m_freem(mout);
12303                         return;
12304                 }
12305                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12306                 udp->uh_dport = port;
12307                 /* set udp->uh_ulen later */
12308                 udp->uh_sum = 0;
12309                 iphlen_out += sizeof(struct udphdr);
12310                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
12311         }
12312         sh_out->src_port = sh->dest_port;
12313         sh_out->dest_port = sh->src_port;
12314         sh_out->v_tag = vtag;
12315         sh_out->checksum = 0;
12316
12317         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
12318         ch->chunk_type = SCTP_OPERATION_ERROR;
12319         ch->chunk_flags = 0;
12320
12321         if (scm) {
12322                 struct mbuf *m_tmp = scm;
12323                 int cause_len = 0;
12324
12325                 /* get length of the err_cause chain */
12326                 while (m_tmp != NULL) {
12327                         cause_len += SCTP_BUF_LEN(m_tmp);
12328                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12329                 }
12330                 len = SCTP_BUF_LEN(mout) + cause_len;
12331                 if (cause_len % 4) {
12332                         /* need pad at end of chunk */
12333                         uint32_t cpthis = 0;
12334                         int padlen;
12335
12336                         padlen = 4 - (len % 4);
12337                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12338                         len += padlen;
12339                 }
12340                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
12341         } else {
12342                 len = SCTP_BUF_LEN(mout);
12343                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
12344         }
12345
12346         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12347                 /* no mbuf's */
12348                 sctp_m_freem(mout);
12349                 return;
12350         }
12351 #ifdef INET
12352         if (iph_out != NULL) {
12353                 sctp_route_t ro;
12354                 int ret;
12355
12356                 /* zap the stack pointer to the route */
12357                 bzero(&ro, sizeof ro);
12358                 if (port) {
12359                         udp->uh_ulen = htons(len - sizeof(struct ip));
12360                         if (V_udp_cksum) {
12361                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12362                         } else {
12363                                 udp->uh_sum = 0;
12364                         }
12365                 }
12366                 /* set IPv4 length */
12367                 iph_out->ip_len = len;
12368                 /* out it goes */
12369 #ifdef  SCTP_PACKET_LOGGING
12370                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12371                         sctp_packet_log(mout, len);
12372 #endif
12373                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12374                 if (port) {
12375 #if defined(SCTP_WITH_NO_CSUM)
12376                         SCTP_STAT_INCR(sctps_sendnocrc);
12377 #else
12378                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12379                         SCTP_STAT_INCR(sctps_sendswcrc);
12380 #endif
12381                         if (V_udp_cksum) {
12382                                 SCTP_ENABLE_UDP_CSUM(o_pak);
12383                         }
12384                 } else {
12385 #if defined(SCTP_WITH_NO_CSUM)
12386                         SCTP_STAT_INCR(sctps_sendnocrc);
12387 #else
12388                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12389                         mout->m_pkthdr.csum_data = 0;
12390                         SCTP_STAT_INCR(sctps_sendhwcrc);
12391 #endif
12392                 }
12393                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12394
12395                 /* Free the route if we got one back */
12396                 if (ro.ro_rt)
12397                         RTFREE(ro.ro_rt);
12398         }
12399 #endif
12400 #ifdef INET6
12401         if (ip6_out != NULL) {
12402                 int ret;
12403
12404                 if (port) {
12405                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12406                 }
12407                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12408 #ifdef  SCTP_PACKET_LOGGING
12409                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12410                         sctp_packet_log(mout, len);
12411 #endif
12412                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12413                 if (port) {
12414 #if defined(SCTP_WITH_NO_CSUM)
12415                         SCTP_STAT_INCR(sctps_sendnocrc);
12416 #else
12417                         sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12418                         SCTP_STAT_INCR(sctps_sendswcrc);
12419 #endif
12420                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12421                                 udp->uh_sum = 0xffff;
12422                         }
12423                 } else {
12424 #if defined(SCTP_WITH_NO_CSUM)
12425                         SCTP_STAT_INCR(sctps_sendnocrc);
12426 #else
12427                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12428                         mout->m_pkthdr.csum_data = 0;
12429                         SCTP_STAT_INCR(sctps_sendhwcrc);
12430 #endif
12431                 }
12432                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
12433         }
12434 #endif
12435         SCTP_STAT_INCR(sctps_sendpackets);
12436         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12437         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12438 }
12439
12440 static struct mbuf *
12441 sctp_copy_resume(struct uio *uio,
12442     int max_send_len,
12443     int user_marks_eor,
12444     int *error,
12445     uint32_t * sndout,
12446     struct mbuf **new_tail)
12447 {
12448         struct mbuf *m;
12449
12450         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12451             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12452         if (m == NULL) {
12453                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12454                 *error = ENOMEM;
12455         } else {
12456                 *sndout = m_length(m, NULL);
12457                 *new_tail = m_last(m);
12458         }
12459         return (m);
12460 }
12461
12462 static int
12463 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12464     struct uio *uio,
12465     int resv_upfront)
12466 {
12467         int left;
12468
12469         left = sp->length;
12470         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12471             resv_upfront, 0);
12472         if (sp->data == NULL) {
12473                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12474                 return (ENOMEM);
12475         }
12476         sp->tail_mbuf = m_last(sp->data);
12477         return (0);
12478 }
12479
12480
12481
12482 static struct sctp_stream_queue_pending *
12483 sctp_copy_it_in(struct sctp_tcb *stcb,
12484     struct sctp_association *asoc,
12485     struct sctp_sndrcvinfo *srcv,
12486     struct uio *uio,
12487     struct sctp_nets *net,
12488     int max_send_len,
12489     int user_marks_eor,
12490     int *error)
12491 {
12492         /*-
12493          * This routine must be very careful in its work. Protocol
12494          * processing is up and running so care must be taken to spl...()
12495          * when you need to do something that may effect the stcb/asoc. The
12496          * sb is locked however. When data is copied the protocol processing
12497          * should be enabled since this is a slower operation...
12498          */
12499         struct sctp_stream_queue_pending *sp = NULL;
12500         int resv_in_first;
12501
12502         *error = 0;
12503         /* Now can we send this? */
12504         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12505             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12506             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12507             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12508                 /* got data while shutting down */
12509                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12510                 *error = ECONNRESET;
12511                 goto out_now;
12512         }
12513         sctp_alloc_a_strmoq(stcb, sp);
12514         if (sp == NULL) {
12515                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12516                 *error = ENOMEM;
12517                 goto out_now;
12518         }
12519         sp->act_flags = 0;
12520         sp->sender_all_done = 0;
12521         sp->sinfo_flags = srcv->sinfo_flags;
12522         sp->timetolive = srcv->sinfo_timetolive;
12523         sp->ppid = srcv->sinfo_ppid;
12524         sp->context = srcv->sinfo_context;
12525         sp->strseq = 0;
12526         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12527
12528         sp->stream = srcv->sinfo_stream;
12529         sp->length = min(uio->uio_resid, max_send_len);
12530         if ((sp->length == (uint32_t) uio->uio_resid) &&
12531             ((user_marks_eor == 0) ||
12532             (srcv->sinfo_flags & SCTP_EOF) ||
12533             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12534                 sp->msg_is_complete = 1;
12535         } else {
12536                 sp->msg_is_complete = 0;
12537         }
12538         sp->sender_all_done = 0;
12539         sp->some_taken = 0;
12540         sp->put_last_out = 0;
12541         resv_in_first = sizeof(struct sctp_data_chunk);
12542         sp->data = sp->tail_mbuf = NULL;
12543         if (sp->length == 0) {
12544                 *error = 0;
12545                 goto skip_copy;
12546         }
12547         if (srcv->sinfo_keynumber_valid) {
12548                 sp->auth_keyid = srcv->sinfo_keynumber;
12549         } else {
12550                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12551         }
12552         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12553                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12554                 sp->holds_key_ref = 1;
12555         }
12556         *error = sctp_copy_one(sp, uio, resv_in_first);
12557 skip_copy:
12558         if (*error) {
12559                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12560                 sp = NULL;
12561         } else {
12562                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12563                         sp->net = net;
12564                         atomic_add_int(&sp->net->ref_count, 1);
12565                 } else {
12566                         sp->net = NULL;
12567                 }
12568                 sctp_set_prsctp_policy(sp);
12569         }
12570 out_now:
12571         return (sp);
12572 }
12573
12574
12575 int
12576 sctp_sosend(struct socket *so,
12577     struct sockaddr *addr,
12578     struct uio *uio,
12579     struct mbuf *top,
12580     struct mbuf *control,
12581     int flags,
12582     struct thread *p
12583 )
12584 {
12585         int error, use_sndinfo = 0;
12586         struct sctp_sndrcvinfo sndrcvninfo;
12587         struct sockaddr *addr_to_use;
12588
12589 #if defined(INET) && defined(INET6)
12590         struct sockaddr_in sin;
12591
12592 #endif
12593
12594         if (control) {
12595                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12596                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12597                     sizeof(sndrcvninfo))) {
12598                         /* got one */
12599                         use_sndinfo = 1;
12600                 }
12601         }
12602         addr_to_use = addr;
12603 #if defined(INET) && defined(INET6)
12604         if ((addr) && (addr->sa_family == AF_INET6)) {
12605                 struct sockaddr_in6 *sin6;
12606
12607                 sin6 = (struct sockaddr_in6 *)addr;
12608                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12609                         in6_sin6_2_sin(&sin, sin6);
12610                         addr_to_use = (struct sockaddr *)&sin;
12611                 }
12612         }
12613 #endif
12614         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12615             control,
12616             flags,
12617             use_sndinfo ? &sndrcvninfo : NULL
12618             ,p
12619             );
12620         return (error);
12621 }
12622
12623
12624 int
12625 sctp_lower_sosend(struct socket *so,
12626     struct sockaddr *addr,
12627     struct uio *uio,
12628     struct mbuf *i_pak,
12629     struct mbuf *control,
12630     int flags,
12631     struct sctp_sndrcvinfo *srcv
12632     ,
12633     struct thread *p
12634 )
12635 {
12636         unsigned int sndlen = 0, max_len;
12637         int error, len;
12638         struct mbuf *top = NULL;
12639         int queue_only = 0, queue_only_for_init = 0;
12640         int free_cnt_applied = 0;
12641         int un_sent;
12642         int now_filled = 0;
12643         unsigned int inqueue_bytes = 0;
12644         struct sctp_block_entry be;
12645         struct sctp_inpcb *inp;
12646         struct sctp_tcb *stcb = NULL;
12647         struct timeval now;
12648         struct sctp_nets *net;
12649         struct sctp_association *asoc;
12650         struct sctp_inpcb *t_inp;
12651         int user_marks_eor;
12652         int create_lock_applied = 0;
12653         int nagle_applies = 0;
12654         int some_on_control = 0;
12655         int got_all_of_the_send = 0;
12656         int hold_tcblock = 0;
12657         int non_blocking = 0;
12658         uint32_t local_add_more, local_soresv = 0;
12659         uint16_t port;
12660         uint16_t sinfo_flags;
12661         sctp_assoc_t sinfo_assoc_id;
12662
12663         error = 0;
12664         net = NULL;
12665         stcb = NULL;
12666         asoc = NULL;
12667
12668         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12669         if (inp == NULL) {
12670                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12671                 error = EINVAL;
12672                 if (i_pak) {
12673                         SCTP_RELEASE_PKT(i_pak);
12674                 }
12675                 return (error);
12676         }
12677         if ((uio == NULL) && (i_pak == NULL)) {
12678                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12679                 return (EINVAL);
12680         }
12681         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12682         atomic_add_int(&inp->total_sends, 1);
12683         if (uio) {
12684                 if (uio->uio_resid < 0) {
12685                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12686                         return (EINVAL);
12687                 }
12688                 sndlen = uio->uio_resid;
12689         } else {
12690                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12691                 sndlen = SCTP_HEADER_LEN(i_pak);
12692         }
12693         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12694             addr,
12695             sndlen);
12696         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12697             (inp->sctp_socket->so_qlimit)) {
12698                 /* The listener can NOT send */
12699                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12700                 error = ENOTCONN;
12701                 goto out_unlocked;
12702         }
12703         /**
12704          * Pre-screen address, if one is given the sin-len
12705          * must be set correctly!
12706          */
12707         if (addr) {
12708                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12709
12710                 switch (raddr->sa.sa_family) {
12711 #if defined(INET)
12712                 case AF_INET:
12713                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12714                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12715                                 error = EINVAL;
12716                                 goto out_unlocked;
12717                         }
12718                         port = raddr->sin.sin_port;
12719                         break;
12720 #endif
12721 #if defined(INET6)
12722                 case AF_INET6:
12723                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12724                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12725                                 error = EINVAL;
12726                                 goto out_unlocked;
12727                         }
12728                         port = raddr->sin6.sin6_port;
12729                         break;
12730 #endif
12731                 default:
12732                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12733                         error = EAFNOSUPPORT;
12734                         goto out_unlocked;
12735                 }
12736         } else
12737                 port = 0;
12738
12739         if (srcv) {
12740                 sinfo_flags = srcv->sinfo_flags;
12741                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12742                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12743                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12744                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12745                         error = EINVAL;
12746                         goto out_unlocked;
12747                 }
12748                 if (srcv->sinfo_flags)
12749                         SCTP_STAT_INCR(sctps_sends_with_flags);
12750         } else {
12751                 sinfo_flags = inp->def_send.sinfo_flags;
12752                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12753         }
12754         if (sinfo_flags & SCTP_SENDALL) {
12755                 /* its a sendall */
12756                 error = sctp_sendall(inp, uio, top, srcv);
12757                 top = NULL;
12758                 goto out_unlocked;
12759         }
12760         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12761                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12762                 error = EINVAL;
12763                 goto out_unlocked;
12764         }
12765         /* now we must find the assoc */
12766         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12767             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12768                 SCTP_INP_RLOCK(inp);
12769                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12770                 if (stcb) {
12771                         SCTP_TCB_LOCK(stcb);
12772                         hold_tcblock = 1;
12773                 }
12774                 SCTP_INP_RUNLOCK(inp);
12775         } else if (sinfo_assoc_id) {
12776                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12777         } else if (addr) {
12778                 /*-
12779                  * Since we did not use findep we must
12780                  * increment it, and if we don't find a tcb
12781                  * decrement it.
12782                  */
12783                 SCTP_INP_WLOCK(inp);
12784                 SCTP_INP_INCR_REF(inp);
12785                 SCTP_INP_WUNLOCK(inp);
12786                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12787                 if (stcb == NULL) {
12788                         SCTP_INP_WLOCK(inp);
12789                         SCTP_INP_DECR_REF(inp);
12790                         SCTP_INP_WUNLOCK(inp);
12791                 } else {
12792                         hold_tcblock = 1;
12793                 }
12794         }
12795         if ((stcb == NULL) && (addr)) {
12796                 /* Possible implicit send? */
12797                 SCTP_ASOC_CREATE_LOCK(inp);
12798                 create_lock_applied = 1;
12799                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12800                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12801                         /* Should I really unlock ? */
12802                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12803                         error = EINVAL;
12804                         goto out_unlocked;
12805
12806                 }
12807                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12808                     (addr->sa_family == AF_INET6)) {
12809                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12810                         error = EINVAL;
12811                         goto out_unlocked;
12812                 }
12813                 SCTP_INP_WLOCK(inp);
12814                 SCTP_INP_INCR_REF(inp);
12815                 SCTP_INP_WUNLOCK(inp);
12816                 /* With the lock applied look again */
12817                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12818                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12819                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12820                 }
12821                 if (stcb == NULL) {
12822                         SCTP_INP_WLOCK(inp);
12823                         SCTP_INP_DECR_REF(inp);
12824                         SCTP_INP_WUNLOCK(inp);
12825                 } else {
12826                         hold_tcblock = 1;
12827                 }
12828                 if (error) {
12829                         goto out_unlocked;
12830                 }
12831                 if (t_inp != inp) {
12832                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12833                         error = ENOTCONN;
12834                         goto out_unlocked;
12835                 }
12836         }
12837         if (stcb == NULL) {
12838                 if (addr == NULL) {
12839                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12840                         error = ENOENT;
12841                         goto out_unlocked;
12842                 } else {
12843                         /* We must go ahead and start the INIT process */
12844                         uint32_t vrf_id;
12845
12846                         if ((sinfo_flags & SCTP_ABORT) ||
12847                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12848                                 /*-
12849                                  * User asks to abort a non-existant assoc,
12850                                  * or EOF a non-existant assoc with no data
12851                                  */
12852                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12853                                 error = ENOENT;
12854                                 goto out_unlocked;
12855                         }
12856                         /* get an asoc/stcb struct */
12857                         vrf_id = inp->def_vrf_id;
12858 #ifdef INVARIANTS
12859                         if (create_lock_applied == 0) {
12860                                 panic("Error, should hold create lock and I don't?");
12861                         }
12862 #endif
12863                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12864                             p
12865                             );
12866                         if (stcb == NULL) {
12867                                 /* Error is setup for us in the call */
12868                                 goto out_unlocked;
12869                         }
12870                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12871                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12872                                 /*
12873                                  * Set the connected flag so we can queue
12874                                  * data
12875                                  */
12876                                 soisconnecting(so);
12877                         }
12878                         hold_tcblock = 1;
12879                         if (create_lock_applied) {
12880                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12881                                 create_lock_applied = 0;
12882                         } else {
12883                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12884                         }
12885                         /*
12886                          * Turn on queue only flag to prevent data from
12887                          * being sent
12888                          */
12889                         queue_only = 1;
12890                         asoc = &stcb->asoc;
12891                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12892                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12893
12894                         /* initialize authentication params for the assoc */
12895                         sctp_initialize_auth_params(inp, stcb);
12896
12897                         if (control) {
12898                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12899                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12900                                         hold_tcblock = 0;
12901                                         stcb = NULL;
12902                                         goto out_unlocked;
12903                                 }
12904                         }
12905                         /* out with the INIT */
12906                         queue_only_for_init = 1;
12907                         /*-
12908                          * we may want to dig in after this call and adjust the MTU
12909                          * value. It defaulted to 1500 (constant) but the ro
12910                          * structure may now have an update and thus we may need to
12911                          * change it BEFORE we append the message.
12912                          */
12913                 }
12914         } else
12915                 asoc = &stcb->asoc;
12916         if (srcv == NULL)
12917                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12918         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12919                 if (addr)
12920                         net = sctp_findnet(stcb, addr);
12921                 else
12922                         net = NULL;
12923                 if ((net == NULL) ||
12924                     ((port != 0) && (port != stcb->rport))) {
12925                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12926                         error = EINVAL;
12927                         goto out_unlocked;
12928                 }
12929         } else {
12930                 if (stcb->asoc.alternate) {
12931                         net = stcb->asoc.alternate;
12932                 } else {
12933                         net = stcb->asoc.primary_destination;
12934                 }
12935         }
12936         atomic_add_int(&stcb->total_sends, 1);
12937         /* Keep the stcb from being freed under our feet */
12938         atomic_add_int(&asoc->refcnt, 1);
12939         free_cnt_applied = 1;
12940
12941         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12942                 if (sndlen > asoc->smallest_mtu) {
12943                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12944                         error = EMSGSIZE;
12945                         goto out_unlocked;
12946                 }
12947         }
12948         if (SCTP_SO_IS_NBIO(so)
12949             || (flags & MSG_NBIO)
12950             ) {
12951                 non_blocking = 1;
12952         }
12953         /* would we block? */
12954         if (non_blocking) {
12955                 if (hold_tcblock == 0) {
12956                         SCTP_TCB_LOCK(stcb);
12957                         hold_tcblock = 1;
12958                 }
12959                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12960                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12961                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12962                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12963                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12964                                 error = EMSGSIZE;
12965                         else
12966                                 error = EWOULDBLOCK;
12967                         goto out_unlocked;
12968                 }
12969                 stcb->asoc.sb_send_resv += sndlen;
12970                 SCTP_TCB_UNLOCK(stcb);
12971                 hold_tcblock = 0;
12972         } else {
12973                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12974         }
12975         local_soresv = sndlen;
12976         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12977                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12978                 error = ECONNRESET;
12979                 goto out_unlocked;
12980         }
12981         if (create_lock_applied) {
12982                 SCTP_ASOC_CREATE_UNLOCK(inp);
12983                 create_lock_applied = 0;
12984         }
12985         if (asoc->stream_reset_outstanding) {
12986                 /*
12987                  * Can't queue any data while stream reset is underway.
12988                  */
12989                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12990                 error = EAGAIN;
12991                 goto out_unlocked;
12992         }
12993         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12994             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12995                 queue_only = 1;
12996         }
12997         /* we are now done with all control */
12998         if (control) {
12999                 sctp_m_freem(control);
13000                 control = NULL;
13001         }
13002         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
13003             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
13004             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
13005             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
13006                 if (srcv->sinfo_flags & SCTP_ABORT) {
13007                         ;
13008                 } else {
13009                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13010                         error = ECONNRESET;
13011                         goto out_unlocked;
13012                 }
13013         }
13014         /* Ok, we will attempt a msgsnd :> */
13015         if (p) {
13016                 p->td_ru.ru_msgsnd++;
13017         }
13018         /* Are we aborting? */
13019         if (srcv->sinfo_flags & SCTP_ABORT) {
13020                 struct mbuf *mm;
13021                 int tot_demand, tot_out = 0, max_out;
13022
13023                 SCTP_STAT_INCR(sctps_sends_with_abort);
13024                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
13025                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
13026                         /* It has to be up before we abort */
13027                         /* how big is the user initiated abort? */
13028                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13029                         error = EINVAL;
13030                         goto out;
13031                 }
13032                 if (hold_tcblock) {
13033                         SCTP_TCB_UNLOCK(stcb);
13034                         hold_tcblock = 0;
13035                 }
13036                 if (top) {
13037                         struct mbuf *cntm = NULL;
13038
13039                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
13040                         if (sndlen != 0) {
13041                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
13042                                         tot_out += SCTP_BUF_LEN(cntm);
13043                                 }
13044                         }
13045                 } else {
13046                         /* Must fit in a MTU */
13047                         tot_out = sndlen;
13048                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
13049                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
13050                                 /* To big */
13051                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13052                                 error = EMSGSIZE;
13053                                 goto out;
13054                         }
13055                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
13056                 }
13057                 if (mm == NULL) {
13058                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13059                         error = ENOMEM;
13060                         goto out;
13061                 }
13062                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
13063                 max_out -= sizeof(struct sctp_abort_msg);
13064                 if (tot_out > max_out) {
13065                         tot_out = max_out;
13066                 }
13067                 if (mm) {
13068                         struct sctp_paramhdr *ph;
13069
13070                         /* now move forward the data pointer */
13071                         ph = mtod(mm, struct sctp_paramhdr *);
13072                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
13073                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
13074                         ph++;
13075                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
13076                         if (top == NULL) {
13077                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
13078                                 if (error) {
13079                                         /*-
13080                                          * Here if we can't get his data we
13081                                          * still abort we just don't get to
13082                                          * send the users note :-0
13083                                          */
13084                                         sctp_m_freem(mm);
13085                                         mm = NULL;
13086                                 }
13087                         } else {
13088                                 if (sndlen != 0) {
13089                                         SCTP_BUF_NEXT(mm) = top;
13090                                 }
13091                         }
13092                 }
13093                 if (hold_tcblock == 0) {
13094                         SCTP_TCB_LOCK(stcb);
13095                 }
13096                 atomic_add_int(&stcb->asoc.refcnt, -1);
13097                 free_cnt_applied = 0;
13098                 /* release this lock, otherwise we hang on ourselves */
13099                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13100                 /* now relock the stcb so everything is sane */
13101                 hold_tcblock = 0;
13102                 stcb = NULL;
13103                 /*
13104                  * In this case top is already chained to mm avoid double
13105                  * free, since we free it below if top != NULL and driver
13106                  * would free it after sending the packet out
13107                  */
13108                 if (sndlen != 0) {
13109                         top = NULL;
13110                 }
13111                 goto out_unlocked;
13112         }
13113         /* Calculate the maximum we can send */
13114         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13115         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13116                 if (non_blocking) {
13117                         /* we already checked for non-blocking above. */
13118                         max_len = sndlen;
13119                 } else {
13120                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13121                 }
13122         } else {
13123                 max_len = 0;
13124         }
13125         if (hold_tcblock) {
13126                 SCTP_TCB_UNLOCK(stcb);
13127                 hold_tcblock = 0;
13128         }
13129         /* Is the stream no. valid? */
13130         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
13131                 /* Invalid stream number */
13132                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13133                 error = EINVAL;
13134                 goto out_unlocked;
13135         }
13136         if (asoc->strmout == NULL) {
13137                 /* huh? software error */
13138                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13139                 error = EFAULT;
13140                 goto out_unlocked;
13141         }
13142         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13143         if ((user_marks_eor == 0) &&
13144             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13145                 /* It will NEVER fit */
13146                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13147                 error = EMSGSIZE;
13148                 goto out_unlocked;
13149         }
13150         if ((uio == NULL) && user_marks_eor) {
13151                 /*-
13152                  * We do not support eeor mode for
13153                  * sending with mbuf chains (like sendfile).
13154                  */
13155                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13156                 error = EINVAL;
13157                 goto out_unlocked;
13158         }
13159         if (user_marks_eor) {
13160                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13161         } else {
13162                 /*-
13163                  * For non-eeor the whole message must fit in
13164                  * the socket send buffer.
13165                  */
13166                 local_add_more = sndlen;
13167         }
13168         len = 0;
13169         if (non_blocking) {
13170                 goto skip_preblock;
13171         }
13172         if (((max_len <= local_add_more) &&
13173             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13174             (max_len == 0) ||
13175             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13176                 /* No room right now ! */
13177                 SOCKBUF_LOCK(&so->so_snd);
13178                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13179                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13180                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13181                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13182                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13183                             inqueue_bytes,
13184                             local_add_more,
13185                             stcb->asoc.stream_queue_cnt,
13186                             stcb->asoc.chunks_on_out_queue,
13187                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13188                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13189                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13190                         }
13191                         be.error = 0;
13192                         stcb->block_entry = &be;
13193                         error = sbwait(&so->so_snd);
13194                         stcb->block_entry = NULL;
13195                         if (error || so->so_error || be.error) {
13196                                 if (error == 0) {
13197                                         if (so->so_error)
13198                                                 error = so->so_error;
13199                                         if (be.error) {
13200                                                 error = be.error;
13201                                         }
13202                                 }
13203                                 SOCKBUF_UNLOCK(&so->so_snd);
13204                                 goto out_unlocked;
13205                         }
13206                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13207                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13208                                     asoc, stcb->asoc.total_output_queue_size);
13209                         }
13210                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13211                                 goto out_unlocked;
13212                         }
13213                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13214                 }
13215                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13216                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13217                 } else {
13218                         max_len = 0;
13219                 }
13220                 SOCKBUF_UNLOCK(&so->so_snd);
13221         }
13222 skip_preblock:
13223         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13224                 goto out_unlocked;
13225         }
13226         /*
13227          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13228          * case NOTE: uio will be null when top/mbuf is passed
13229          */
13230         if (sndlen == 0) {
13231                 if (srcv->sinfo_flags & SCTP_EOF) {
13232                         got_all_of_the_send = 1;
13233                         goto dataless_eof;
13234                 } else {
13235                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13236                         error = EINVAL;
13237                         goto out;
13238                 }
13239         }
13240         if (top == NULL) {
13241                 struct sctp_stream_queue_pending *sp;
13242                 struct sctp_stream_out *strm;
13243                 uint32_t sndout;
13244
13245                 SCTP_TCB_SEND_LOCK(stcb);
13246                 if ((asoc->stream_locked) &&
13247                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13248                         SCTP_TCB_SEND_UNLOCK(stcb);
13249                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13250                         error = EINVAL;
13251                         goto out;
13252                 }
13253                 SCTP_TCB_SEND_UNLOCK(stcb);
13254
13255                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13256                 if (strm->last_msg_incomplete == 0) {
13257         do_a_copy_in:
13258                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13259                         if ((sp == NULL) || (error)) {
13260                                 goto out;
13261                         }
13262                         SCTP_TCB_SEND_LOCK(stcb);
13263                         if (sp->msg_is_complete) {
13264                                 strm->last_msg_incomplete = 0;
13265                                 asoc->stream_locked = 0;
13266                         } else {
13267                                 /*
13268                                  * Just got locked to this guy in case of an
13269                                  * interrupt.
13270                                  */
13271                                 strm->last_msg_incomplete = 1;
13272                                 asoc->stream_locked = 1;
13273                                 asoc->stream_locked_on = srcv->sinfo_stream;
13274                                 sp->sender_all_done = 0;
13275                         }
13276                         sctp_snd_sb_alloc(stcb, sp->length);
13277                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13278                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
13279                                 sp->strseq = strm->next_sequence_sent;
13280                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
13281                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
13282                                             (uintptr_t) stcb, sp->length,
13283                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
13284                                 }
13285                                 strm->next_sequence_sent++;
13286                         } else {
13287                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13288                         }
13289                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13290                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13291                         SCTP_TCB_SEND_UNLOCK(stcb);
13292                 } else {
13293                         SCTP_TCB_SEND_LOCK(stcb);
13294                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13295                         SCTP_TCB_SEND_UNLOCK(stcb);
13296                         if (sp == NULL) {
13297                                 /* ???? Huh ??? last msg is gone */
13298 #ifdef INVARIANTS
13299                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13300 #else
13301                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13302                                 strm->last_msg_incomplete = 0;
13303 #endif
13304                                 goto do_a_copy_in;
13305
13306                         }
13307                 }
13308                 while (uio->uio_resid > 0) {
13309                         /* How much room do we have? */
13310                         struct mbuf *new_tail, *mm;
13311
13312                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13313                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13314                         else
13315                                 max_len = 0;
13316
13317                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13318                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13319                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13320                                 sndout = 0;
13321                                 new_tail = NULL;
13322                                 if (hold_tcblock) {
13323                                         SCTP_TCB_UNLOCK(stcb);
13324                                         hold_tcblock = 0;
13325                                 }
13326                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13327                                 if ((mm == NULL) || error) {
13328                                         if (mm) {
13329                                                 sctp_m_freem(mm);
13330                                         }
13331                                         goto out;
13332                                 }
13333                                 /* Update the mbuf and count */
13334                                 SCTP_TCB_SEND_LOCK(stcb);
13335                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13336                                         /*
13337                                          * we need to get out. Peer probably
13338                                          * aborted.
13339                                          */
13340                                         sctp_m_freem(mm);
13341                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13342                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13343                                                 error = ECONNRESET;
13344                                         }
13345                                         SCTP_TCB_SEND_UNLOCK(stcb);
13346                                         goto out;
13347                                 }
13348                                 if (sp->tail_mbuf) {
13349                                         /* tack it to the end */
13350                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13351                                         sp->tail_mbuf = new_tail;
13352                                 } else {
13353                                         /* A stolen mbuf */
13354                                         sp->data = mm;
13355                                         sp->tail_mbuf = new_tail;
13356                                 }
13357                                 sctp_snd_sb_alloc(stcb, sndout);
13358                                 atomic_add_int(&sp->length, sndout);
13359                                 len += sndout;
13360
13361                                 /* Did we reach EOR? */
13362                                 if ((uio->uio_resid == 0) &&
13363                                     ((user_marks_eor == 0) ||
13364                                     (srcv->sinfo_flags & SCTP_EOF) ||
13365                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13366                                         sp->msg_is_complete = 1;
13367                                 } else {
13368                                         sp->msg_is_complete = 0;
13369                                 }
13370                                 SCTP_TCB_SEND_UNLOCK(stcb);
13371                         }
13372                         if (uio->uio_resid == 0) {
13373                                 /* got it all? */
13374                                 continue;
13375                         }
13376                         /* PR-SCTP? */
13377                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13378                                 /*
13379                                  * This is ugly but we must assure locking
13380                                  * order
13381                                  */
13382                                 if (hold_tcblock == 0) {
13383                                         SCTP_TCB_LOCK(stcb);
13384                                         hold_tcblock = 1;
13385                                 }
13386                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13387                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13388                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13389                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13390                                 else
13391                                         max_len = 0;
13392                                 if (max_len > 0) {
13393                                         continue;
13394                                 }
13395                                 SCTP_TCB_UNLOCK(stcb);
13396                                 hold_tcblock = 0;
13397                         }
13398                         /* wait for space now */
13399                         if (non_blocking) {
13400                                 /* Non-blocking io in place out */
13401                                 goto skip_out_eof;
13402                         }
13403                         /* What about the INIT, send it maybe */
13404                         if (queue_only_for_init) {
13405                                 if (hold_tcblock == 0) {
13406                                         SCTP_TCB_LOCK(stcb);
13407                                         hold_tcblock = 1;
13408                                 }
13409                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13410                                         /* a collision took us forward? */
13411                                         queue_only = 0;
13412                                 } else {
13413                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13414                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13415                                         queue_only = 1;
13416                                 }
13417                         }
13418                         if ((net->flight_size > net->cwnd) &&
13419                             (asoc->sctp_cmt_on_off == 0)) {
13420                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13421                                 queue_only = 1;
13422                         } else if (asoc->ifp_had_enobuf) {
13423                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13424                                 if (net->flight_size > (2 * net->mtu)) {
13425                                         queue_only = 1;
13426                                 }
13427                                 asoc->ifp_had_enobuf = 0;
13428                         }
13429                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13430                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13431                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13432                             (stcb->asoc.total_flight > 0) &&
13433                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13434                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13435
13436                                 /*-
13437                                  * Ok, Nagle is set on and we have data outstanding.
13438                                  * Don't send anything and let SACKs drive out the
13439                                  * data unless wen have a "full" segment to send.
13440                                  */
13441                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13442                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13443                                 }
13444                                 SCTP_STAT_INCR(sctps_naglequeued);
13445                                 nagle_applies = 1;
13446                         } else {
13447                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13448                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13449                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13450                                 }
13451                                 SCTP_STAT_INCR(sctps_naglesent);
13452                                 nagle_applies = 0;
13453                         }
13454                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13455
13456                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13457                                     nagle_applies, un_sent);
13458                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13459                                     stcb->asoc.total_flight,
13460                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13461                         }
13462                         if (queue_only_for_init)
13463                                 queue_only_for_init = 0;
13464                         if ((queue_only == 0) && (nagle_applies == 0)) {
13465                                 /*-
13466                                  * need to start chunk output
13467                                  * before blocking.. note that if
13468                                  * a lock is already applied, then
13469                                  * the input via the net is happening
13470                                  * and I don't need to start output :-D
13471                                  */
13472                                 if (hold_tcblock == 0) {
13473                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13474                                                 hold_tcblock = 1;
13475                                                 sctp_chunk_output(inp,
13476                                                     stcb,
13477                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13478                                         }
13479                                 } else {
13480                                         sctp_chunk_output(inp,
13481                                             stcb,
13482                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13483                                 }
13484                                 if (hold_tcblock == 1) {
13485                                         SCTP_TCB_UNLOCK(stcb);
13486                                         hold_tcblock = 0;
13487                                 }
13488                         }
13489                         SOCKBUF_LOCK(&so->so_snd);
13490                         /*-
13491                          * This is a bit strange, but I think it will
13492                          * work. The total_output_queue_size is locked and
13493                          * protected by the TCB_LOCK, which we just released.
13494                          * There is a race that can occur between releasing it
13495                          * above, and me getting the socket lock, where sacks
13496                          * come in but we have not put the SB_WAIT on the
13497                          * so_snd buffer to get the wakeup. After the LOCK
13498                          * is applied the sack_processing will also need to
13499                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13500                          * once we have the socket buffer lock if we recheck the
13501                          * size we KNOW we will get to sleep safely with the
13502                          * wakeup flag in place.
13503                          */
13504                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13505                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13506                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13507                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13508                                             asoc, uio->uio_resid);
13509                                 }
13510                                 be.error = 0;
13511                                 stcb->block_entry = &be;
13512                                 error = sbwait(&so->so_snd);
13513                                 stcb->block_entry = NULL;
13514
13515                                 if (error || so->so_error || be.error) {
13516                                         if (error == 0) {
13517                                                 if (so->so_error)
13518                                                         error = so->so_error;
13519                                                 if (be.error) {
13520                                                         error = be.error;
13521                                                 }
13522                                         }
13523                                         SOCKBUF_UNLOCK(&so->so_snd);
13524                                         goto out_unlocked;
13525                                 }
13526                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13527                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13528                                             asoc, stcb->asoc.total_output_queue_size);
13529                                 }
13530                         }
13531                         SOCKBUF_UNLOCK(&so->so_snd);
13532                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13533                                 goto out_unlocked;
13534                         }
13535                 }
13536                 SCTP_TCB_SEND_LOCK(stcb);
13537                 if (sp) {
13538                         if (sp->msg_is_complete == 0) {
13539                                 strm->last_msg_incomplete = 1;
13540                                 asoc->stream_locked = 1;
13541                                 asoc->stream_locked_on = srcv->sinfo_stream;
13542                         } else {
13543                                 sp->sender_all_done = 1;
13544                                 strm->last_msg_incomplete = 0;
13545                                 asoc->stream_locked = 0;
13546                         }
13547                 } else {
13548                         SCTP_PRINTF("Huh no sp TSNH?\n");
13549                         strm->last_msg_incomplete = 0;
13550                         asoc->stream_locked = 0;
13551                 }
13552                 SCTP_TCB_SEND_UNLOCK(stcb);
13553                 if (uio->uio_resid == 0) {
13554                         got_all_of_the_send = 1;
13555                 }
13556         } else {
13557                 /* We send in a 0, since we do NOT have any locks */
13558                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13559                 top = NULL;
13560                 if (srcv->sinfo_flags & SCTP_EOF) {
13561                         /*
13562                          * This should only happen for Panda for the mbuf
13563                          * send case, which does NOT yet support EEOR mode.
13564                          * Thus, we can just set this flag to do the proper
13565                          * EOF handling.
13566                          */
13567                         got_all_of_the_send = 1;
13568                 }
13569         }
13570         if (error) {
13571                 goto out;
13572         }
13573 dataless_eof:
13574         /* EOF thing ? */
13575         if ((srcv->sinfo_flags & SCTP_EOF) &&
13576             (got_all_of_the_send == 1)) {
13577                 int cnt;
13578
13579                 SCTP_STAT_INCR(sctps_sends_with_eof);
13580                 error = 0;
13581                 if (hold_tcblock == 0) {
13582                         SCTP_TCB_LOCK(stcb);
13583                         hold_tcblock = 1;
13584                 }
13585                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13586                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13587                     TAILQ_EMPTY(&asoc->sent_queue) &&
13588                     (cnt == 0)) {
13589                         if (asoc->locked_on_sending) {
13590                                 goto abort_anyway;
13591                         }
13592                         /* there is nothing queued to send, so I'm done... */
13593                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13594                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13595                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13596                                 struct sctp_nets *netp;
13597
13598                                 if (stcb->asoc.alternate) {
13599                                         netp = stcb->asoc.alternate;
13600                                 } else {
13601                                         netp = stcb->asoc.primary_destination;
13602                                 }
13603                                 /* only send SHUTDOWN the first time through */
13604                                 sctp_send_shutdown(stcb, netp);
13605                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13606                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13607                                 }
13608                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13609                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13610                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13611                                     netp);
13612                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13613                                     asoc->primary_destination);
13614                         }
13615                 } else {
13616                         /*-
13617                          * we still got (or just got) data to send, so set
13618                          * SHUTDOWN_PENDING
13619                          */
13620                         /*-
13621                          * XXX sockets draft says that SCTP_EOF should be
13622                          * sent with no data.  currently, we will allow user
13623                          * data to be sent first and move to
13624                          * SHUTDOWN-PENDING
13625                          */
13626                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13627                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13628                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13629                                 if (hold_tcblock == 0) {
13630                                         SCTP_TCB_LOCK(stcb);
13631                                         hold_tcblock = 1;
13632                                 }
13633                                 if (asoc->locked_on_sending) {
13634                                         /* Locked to send out the data */
13635                                         struct sctp_stream_queue_pending *sp;
13636
13637                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13638                                         if (sp) {
13639                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13640                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13641                                         }
13642                                 }
13643                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13644                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13645                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13646                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13647                         abort_anyway:
13648                                         if (free_cnt_applied) {
13649                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13650                                                 free_cnt_applied = 0;
13651                                         }
13652                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13653                                             NULL, SCTP_SO_LOCKED);
13654                                         /*
13655                                          * now relock the stcb so everything
13656                                          * is sane
13657                                          */
13658                                         hold_tcblock = 0;
13659                                         stcb = NULL;
13660                                         goto out;
13661                                 }
13662                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13663                                     asoc->primary_destination);
13664                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13665                         }
13666                 }
13667         }
13668 skip_out_eof:
13669         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13670                 some_on_control = 1;
13671         }
13672         if (queue_only_for_init) {
13673                 if (hold_tcblock == 0) {
13674                         SCTP_TCB_LOCK(stcb);
13675                         hold_tcblock = 1;
13676                 }
13677                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13678                         /* a collision took us forward? */
13679                         queue_only = 0;
13680                 } else {
13681                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13682                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13683                         queue_only = 1;
13684                 }
13685         }
13686         if ((net->flight_size > net->cwnd) &&
13687             (stcb->asoc.sctp_cmt_on_off == 0)) {
13688                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13689                 queue_only = 1;
13690         } else if (asoc->ifp_had_enobuf) {
13691                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13692                 if (net->flight_size > (2 * net->mtu)) {
13693                         queue_only = 1;
13694                 }
13695                 asoc->ifp_had_enobuf = 0;
13696         }
13697         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13698             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13699         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13700             (stcb->asoc.total_flight > 0) &&
13701             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13702             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13703                 /*-
13704                  * Ok, Nagle is set on and we have data outstanding.
13705                  * Don't send anything and let SACKs drive out the
13706                  * data unless wen have a "full" segment to send.
13707                  */
13708                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13709                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13710                 }
13711                 SCTP_STAT_INCR(sctps_naglequeued);
13712                 nagle_applies = 1;
13713         } else {
13714                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13715                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13716                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13717                 }
13718                 SCTP_STAT_INCR(sctps_naglesent);
13719                 nagle_applies = 0;
13720         }
13721         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13722                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13723                     nagle_applies, un_sent);
13724                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13725                     stcb->asoc.total_flight,
13726                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13727         }
13728         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13729                 /* we can attempt to send too. */
13730                 if (hold_tcblock == 0) {
13731                         /*
13732                          * If there is activity recv'ing sacks no need to
13733                          * send
13734                          */
13735                         if (SCTP_TCB_TRYLOCK(stcb)) {
13736                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13737                                 hold_tcblock = 1;
13738                         }
13739                 } else {
13740                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13741                 }
13742         } else if ((queue_only == 0) &&
13743                     (stcb->asoc.peers_rwnd == 0) &&
13744             (stcb->asoc.total_flight == 0)) {
13745                 /* We get to have a probe outstanding */
13746                 if (hold_tcblock == 0) {
13747                         hold_tcblock = 1;
13748                         SCTP_TCB_LOCK(stcb);
13749                 }
13750                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13751         } else if (some_on_control) {
13752                 int num_out, reason, frag_point;
13753
13754                 /* Here we do control only */
13755                 if (hold_tcblock == 0) {
13756                         hold_tcblock = 1;
13757                         SCTP_TCB_LOCK(stcb);
13758                 }
13759                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13760                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13761                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13762         }
13763         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13764             queue_only, stcb->asoc.peers_rwnd, un_sent,
13765             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13766             stcb->asoc.total_output_queue_size, error);
13767
13768 out:
13769 out_unlocked:
13770
13771         if (local_soresv && stcb) {
13772                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13773         }
13774         if (create_lock_applied) {
13775                 SCTP_ASOC_CREATE_UNLOCK(inp);
13776         }
13777         if ((stcb) && hold_tcblock) {
13778                 SCTP_TCB_UNLOCK(stcb);
13779         }
13780         if (stcb && free_cnt_applied) {
13781                 atomic_add_int(&stcb->asoc.refcnt, -1);
13782         }
13783 #ifdef INVARIANTS
13784         if (stcb) {
13785                 if (mtx_owned(&stcb->tcb_mtx)) {
13786                         panic("Leaving with tcb mtx owned?");
13787                 }
13788                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13789                         panic("Leaving with tcb send mtx owned?");
13790                 }
13791         }
13792 #endif
13793 #ifdef INVARIANTS
13794         if (inp) {
13795                 sctp_validate_no_locks(inp);
13796         } else {
13797                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13798         }
13799 #endif
13800         if (top) {
13801                 sctp_m_freem(top);
13802         }
13803         if (control) {
13804                 sctp_m_freem(control);
13805         }
13806         return (error);
13807 }
13808
13809
13810 /*
13811  * generate an AUTHentication chunk, if required
13812  */
13813 struct mbuf *
13814 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13815     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13816     struct sctp_tcb *stcb, uint8_t chunk)
13817 {
13818         struct mbuf *m_auth;
13819         struct sctp_auth_chunk *auth;
13820         int chunk_len;
13821         struct mbuf *cn;
13822
13823         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13824             (stcb == NULL))
13825                 return (m);
13826
13827         /* sysctl disabled auth? */
13828         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13829                 return (m);
13830
13831         /* peer doesn't do auth... */
13832         if (!stcb->asoc.peer_supports_auth) {
13833                 return (m);
13834         }
13835         /* does the requested chunk require auth? */
13836         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13837                 return (m);
13838         }
13839         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13840         if (m_auth == NULL) {
13841                 /* no mbuf's */
13842                 return (m);
13843         }
13844         /* reserve some space if this will be the first mbuf */
13845         if (m == NULL)
13846                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13847         /* fill in the AUTH chunk details */
13848         auth = mtod(m_auth, struct sctp_auth_chunk *);
13849         bzero(auth, sizeof(*auth));
13850         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13851         auth->ch.chunk_flags = 0;
13852         chunk_len = sizeof(*auth) +
13853             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13854         auth->ch.chunk_length = htons(chunk_len);
13855         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13856         /* key id and hmac digest will be computed and filled in upon send */
13857
13858         /* save the offset where the auth was inserted into the chain */
13859         *offset = 0;
13860         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13861                 *offset += SCTP_BUF_LEN(cn);
13862         }
13863
13864         /* update length and return pointer to the auth chunk */
13865         SCTP_BUF_LEN(m_auth) = chunk_len;
13866         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13867         if (auth_ret != NULL)
13868                 *auth_ret = auth;
13869
13870         return (m);
13871 }
13872
13873 #ifdef INET6
13874 int
13875 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13876 {
13877         struct nd_prefix *pfx = NULL;
13878         struct nd_pfxrouter *pfxrtr = NULL;
13879         struct sockaddr_in6 gw6;
13880
13881         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13882                 return (0);
13883
13884         /* get prefix entry of address */
13885         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13886                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13887                         continue;
13888                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13889                     &src6->sin6_addr, &pfx->ndpr_mask))
13890                         break;
13891         }
13892         /* no prefix entry in the prefix list */
13893         if (pfx == NULL) {
13894                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13895                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13896                 return (0);
13897         }
13898         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13899         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13900
13901         /* search installed gateway from prefix entry */
13902         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13903                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13904                 gw6.sin6_family = AF_INET6;
13905                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13906                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13907                     sizeof(struct in6_addr));
13908                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13909                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13910                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13911                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13912                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13913                     ro->ro_rt->rt_gateway)) {
13914                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13915                         return (1);
13916                 }
13917         }
13918         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13919         return (0);
13920 }
13921
13922 #endif
13923
13924 int
13925 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13926 {
13927 #ifdef INET
13928         struct sockaddr_in *sin, *mask;
13929         struct ifaddr *ifa;
13930         struct in_addr srcnetaddr, gwnetaddr;
13931
13932         if (ro == NULL || ro->ro_rt == NULL ||
13933             sifa->address.sa.sa_family != AF_INET) {
13934                 return (0);
13935         }
13936         ifa = (struct ifaddr *)sifa->ifa;
13937         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13938         sin = (struct sockaddr_in *)&sifa->address.sin;
13939         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13940         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13941         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13942         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13943
13944         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13945         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13946         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13947         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13948         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13949         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13950                 return (1);
13951         }
13952 #endif
13953         return (0);
13954 }