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                                 if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4120                                     (stcb) &&
4121                                     (stcb->asoc.loopback_scope))) {
4122                                         sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4123                                         SCTP_STAT_INCR(sctps_sendswcrc);
4124                                 } else {
4125                                         SCTP_STAT_INCR(sctps_sendnocrc);
4126                                 }
4127 #endif
4128                                 if (V_udp_cksum) {
4129                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4130                                 }
4131                         } else {
4132 #if defined(SCTP_WITH_NO_CSUM)
4133                                 SCTP_STAT_INCR(sctps_sendnocrc);
4134 #else
4135                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4136                                 m->m_pkthdr.csum_data = 0;
4137                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4138 #endif
4139                         }
4140                         /* send it out.  table id is taken from stcb */
4141 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4142                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4143                                 so = SCTP_INP_SO(inp);
4144                                 SCTP_SOCKET_UNLOCK(so, 0);
4145                         }
4146 #endif
4147                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4148 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4149                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4150                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4151                                 SCTP_TCB_UNLOCK(stcb);
4152                                 SCTP_SOCKET_LOCK(so, 0);
4153                                 SCTP_TCB_LOCK(stcb);
4154                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4155                         }
4156 #endif
4157                         SCTP_STAT_INCR(sctps_sendpackets);
4158                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4159                         if (ret)
4160                                 SCTP_STAT_INCR(sctps_senderrors);
4161
4162                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4163                         if (net == NULL) {
4164                                 /* free tempy routes */
4165                                 if (ro->ro_rt) {
4166                                         RTFREE(ro->ro_rt);
4167                                         ro->ro_rt = NULL;
4168                                 }
4169                         } else {
4170                                 /*
4171                                  * PMTU check versus smallest asoc MTU goes
4172                                  * here
4173                                  */
4174                                 if ((ro->ro_rt != NULL) &&
4175                                     (net->ro._s_addr)) {
4176                                         uint32_t mtu;
4177
4178                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4179                                         if (net->port) {
4180                                                 mtu -= sizeof(struct udphdr);
4181                                         }
4182                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4183                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4184                                                 net->mtu = mtu;
4185                                         }
4186                                 } else if (ro->ro_rt == NULL) {
4187                                         /* route was freed */
4188                                         if (net->ro._s_addr &&
4189                                             net->src_addr_selected) {
4190                                                 sctp_free_ifa(net->ro._s_addr);
4191                                                 net->ro._s_addr = NULL;
4192                                         }
4193                                         net->src_addr_selected = 0;
4194                                 }
4195                         }
4196                         return (ret);
4197                 }
4198 #endif
4199 #ifdef INET6
4200         case AF_INET6:
4201                 {
4202                         uint32_t flowlabel, flowinfo;
4203                         struct ip6_hdr *ip6h;
4204                         struct route_in6 ip6route;
4205                         struct ifnet *ifp;
4206                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4207                         int prev_scope = 0;
4208                         struct sockaddr_in6 lsa6_storage;
4209                         int error;
4210                         u_short prev_port = 0;
4211                         int len;
4212
4213                         if (net) {
4214                                 flowlabel = net->flowlabel;
4215                         } else if (stcb) {
4216                                 flowlabel = stcb->asoc.default_flowlabel;
4217                         } else {
4218                                 flowlabel = inp->sctp_ep.default_flowlabel;
4219                         }
4220                         if (flowlabel == 0) {
4221                                 /*
4222                                  * This means especially, that it is not set
4223                                  * at the SCTP layer. So use the value from
4224                                  * the IP layer.
4225                                  */
4226                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4227                         }
4228                         flowlabel &= 0x000fffff;
4229                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4230                         if (port) {
4231                                 len += sizeof(struct udphdr);
4232                         }
4233                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4234                         if (newm == NULL) {
4235                                 sctp_m_freem(m);
4236                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4237                                 return (ENOMEM);
4238                         }
4239                         SCTP_ALIGN_TO_END(newm, len);
4240                         SCTP_BUF_LEN(newm) = len;
4241                         SCTP_BUF_NEXT(newm) = m;
4242                         m = newm;
4243                         if (net != NULL) {
4244 #ifdef INVARIANTS
4245                                 if (net->flowidset == 0) {
4246                                         panic("Flow ID not set");
4247                                 }
4248 #endif
4249                                 m->m_pkthdr.flowid = net->flowid;
4250                                 m->m_flags |= M_FLOWID;
4251                         } else {
4252                                 if ((init != NULL) && (init->m_flags & M_FLOWID)) {
4253                                         m->m_pkthdr.flowid = init->m_pkthdr.flowid;
4254                                         m->m_flags |= M_FLOWID;
4255                                 }
4256                         }
4257                         packet_length = sctp_calculate_len(m);
4258
4259                         ip6h = mtod(m, struct ip6_hdr *);
4260                         /* protect *sin6 from overwrite */
4261                         sin6 = (struct sockaddr_in6 *)to;
4262                         tmp = *sin6;
4263                         sin6 = &tmp;
4264
4265                         /* KAME hack: embed scopeid */
4266                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4267                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4268                                 return (EINVAL);
4269                         }
4270                         if (net == NULL) {
4271                                 memset(&ip6route, 0, sizeof(ip6route));
4272                                 ro = (sctp_route_t *) & ip6route;
4273                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4274                         } else {
4275                                 ro = (sctp_route_t *) & net->ro;
4276                         }
4277                         /*
4278                          * We assume here that inp_flow is in host byte
4279                          * order within the TCB!
4280                          */
4281                         if (tos_value == 0) {
4282                                 /*
4283                                  * This means especially, that it is not set
4284                                  * at the SCTP layer. So use the value from
4285                                  * the IP layer.
4286                                  */
4287                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4288                         }
4289                         tos_value &= 0xfc;
4290                         if (ecn_ok) {
4291                                 tos_value |= sctp_get_ect(stcb);
4292                         }
4293                         flowinfo = 0x06;
4294                         flowinfo <<= 8;
4295                         flowinfo |= tos_value;
4296                         flowinfo <<= 20;
4297                         flowinfo |= flowlabel;
4298                         ip6h->ip6_flow = htonl(flowinfo);
4299                         if (port) {
4300                                 ip6h->ip6_nxt = IPPROTO_UDP;
4301                         } else {
4302                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4303                         }
4304                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4305                         ip6h->ip6_dst = sin6->sin6_addr;
4306
4307                         /*
4308                          * Add SRC address selection here: we can only reuse
4309                          * to a limited degree the kame src-addr-sel, since
4310                          * we can try their selection but it may not be
4311                          * bound.
4312                          */
4313                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4314                         lsa6_tmp.sin6_family = AF_INET6;
4315                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4316                         lsa6 = &lsa6_tmp;
4317                         if (net && out_of_asoc_ok == 0) {
4318                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4319                                         sctp_free_ifa(net->ro._s_addr);
4320                                         net->ro._s_addr = NULL;
4321                                         net->src_addr_selected = 0;
4322                                         if (ro->ro_rt) {
4323                                                 RTFREE(ro->ro_rt);
4324                                                 ro->ro_rt = NULL;
4325                                         }
4326                                 }
4327                                 if (net->src_addr_selected == 0) {
4328                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4329                                         /* KAME hack: embed scopeid */
4330                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4331                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4332                                                 return (EINVAL);
4333                                         }
4334                                         /* Cache the source address */
4335                                         net->ro._s_addr = sctp_source_address_selection(inp,
4336                                             stcb,
4337                                             ro,
4338                                             net,
4339                                             0,
4340                                             vrf_id);
4341                                         (void)sa6_recoverscope(sin6);
4342                                         net->src_addr_selected = 1;
4343                                 }
4344                                 if (net->ro._s_addr == NULL) {
4345                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4346                                         net->src_addr_selected = 0;
4347                                         sctp_handle_no_route(stcb, net, so_locked);
4348                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4349                                         sctp_m_freem(m);
4350                                         return (EHOSTUNREACH);
4351                                 }
4352                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4353                         } else {
4354                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4355                                 /* KAME hack: embed scopeid */
4356                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4357                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4358                                         return (EINVAL);
4359                                 }
4360                                 if (over_addr == NULL) {
4361                                         struct sctp_ifa *_lsrc;
4362
4363                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4364                                             net,
4365                                             out_of_asoc_ok,
4366                                             vrf_id);
4367                                         if (_lsrc == NULL) {
4368                                                 sctp_handle_no_route(stcb, net, so_locked);
4369                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4370                                                 sctp_m_freem(m);
4371                                                 return (EHOSTUNREACH);
4372                                         }
4373                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4374                                         sctp_free_ifa(_lsrc);
4375                                 } else {
4376                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4377                                         SCTP_RTALLOC(ro, vrf_id);
4378                                 }
4379                                 (void)sa6_recoverscope(sin6);
4380                         }
4381                         lsa6->sin6_port = inp->sctp_lport;
4382
4383                         if (ro->ro_rt == NULL) {
4384                                 /*
4385                                  * src addr selection failed to find a route
4386                                  * (or valid source addr), so we can't get
4387                                  * there from here!
4388                                  */
4389                                 sctp_handle_no_route(stcb, net, so_locked);
4390                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4391                                 sctp_m_freem(m);
4392                                 return (EHOSTUNREACH);
4393                         }
4394                         /*
4395                          * XXX: sa6 may not have a valid sin6_scope_id in
4396                          * the non-SCOPEDROUTING case.
4397                          */
4398                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4399                         lsa6_storage.sin6_family = AF_INET6;
4400                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4401                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4402                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4403                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4404                                 sctp_m_freem(m);
4405                                 return (error);
4406                         }
4407                         /* XXX */
4408                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4409                         lsa6_storage.sin6_port = inp->sctp_lport;
4410                         lsa6 = &lsa6_storage;
4411                         ip6h->ip6_src = lsa6->sin6_addr;
4412
4413                         if (port) {
4414                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4415                                         sctp_handle_no_route(stcb, net, so_locked);
4416                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4417                                         sctp_m_freem(m);
4418                                         return (EHOSTUNREACH);
4419                                 }
4420                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4421                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4422                                 udp->uh_dport = port;
4423                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4424                                 udp->uh_sum = 0;
4425                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4426                         } else {
4427                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4428                         }
4429
4430                         sctphdr->src_port = src_port;
4431                         sctphdr->dest_port = dest_port;
4432                         sctphdr->v_tag = v_tag;
4433                         sctphdr->checksum = 0;
4434
4435                         /*
4436                          * We set the hop limit now since there is a good
4437                          * chance that our ro pointer is now filled
4438                          */
4439                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4440                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4441
4442 #ifdef SCTP_DEBUG
4443                         /* Copy to be sure something bad is not happening */
4444                         sin6->sin6_addr = ip6h->ip6_dst;
4445                         lsa6->sin6_addr = ip6h->ip6_src;
4446 #endif
4447
4448                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4449                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4450                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4451                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4452                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4453                         if (net) {
4454                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4455                                 /*
4456                                  * preserve the port and scope for link
4457                                  * local send
4458                                  */
4459                                 prev_scope = sin6->sin6_scope_id;
4460                                 prev_port = sin6->sin6_port;
4461                         }
4462                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4463                                 /* failed to prepend data, give up */
4464                                 sctp_m_freem(m);
4465                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4466                                 return (ENOMEM);
4467                         }
4468 #ifdef  SCTP_PACKET_LOGGING
4469                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4470                                 sctp_packet_log(m, packet_length);
4471 #endif
4472                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4473                         if (port) {
4474 #if defined(SCTP_WITH_NO_CSUM)
4475                                 SCTP_STAT_INCR(sctps_sendnocrc);
4476 #else
4477                                 if (!(SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
4478                                     (stcb) &&
4479                                     (stcb->asoc.loopback_scope))) {
4480                                         sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4481                                         SCTP_STAT_INCR(sctps_sendswcrc);
4482                                 } else {
4483                                         SCTP_STAT_INCR(sctps_sendnocrc);
4484                                 }
4485 #endif
4486                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4487                                         udp->uh_sum = 0xffff;
4488                                 }
4489                         } else {
4490 #if defined(SCTP_WITH_NO_CSUM)
4491                                 SCTP_STAT_INCR(sctps_sendnocrc);
4492 #else
4493                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4494                                 m->m_pkthdr.csum_data = 0;
4495                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4496 #endif
4497                         }
4498                         /* send it out. table id is taken from stcb */
4499 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4500                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4501                                 so = SCTP_INP_SO(inp);
4502                                 SCTP_SOCKET_UNLOCK(so, 0);
4503                         }
4504 #endif
4505                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4506 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4507                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4508                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4509                                 SCTP_TCB_UNLOCK(stcb);
4510                                 SCTP_SOCKET_LOCK(so, 0);
4511                                 SCTP_TCB_LOCK(stcb);
4512                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4513                         }
4514 #endif
4515                         if (net) {
4516                                 /* for link local this must be done */
4517                                 sin6->sin6_scope_id = prev_scope;
4518                                 sin6->sin6_port = prev_port;
4519                         }
4520                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4521                         SCTP_STAT_INCR(sctps_sendpackets);
4522                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4523                         if (ret) {
4524                                 SCTP_STAT_INCR(sctps_senderrors);
4525                         }
4526                         if (net == NULL) {
4527                                 /* Now if we had a temp route free it */
4528                                 if (ro->ro_rt) {
4529                                         RTFREE(ro->ro_rt);
4530                                 }
4531                         } else {
4532                                 /*
4533                                  * PMTU check versus smallest asoc MTU goes
4534                                  * here
4535                                  */
4536                                 if (ro->ro_rt == NULL) {
4537                                         /* Route was freed */
4538                                         if (net->ro._s_addr &&
4539                                             net->src_addr_selected) {
4540                                                 sctp_free_ifa(net->ro._s_addr);
4541                                                 net->ro._s_addr = NULL;
4542                                         }
4543                                         net->src_addr_selected = 0;
4544                                 }
4545                                 if ((ro->ro_rt != NULL) &&
4546                                     (net->ro._s_addr)) {
4547                                         uint32_t mtu;
4548
4549                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4550                                         if (mtu &&
4551                                             (stcb->asoc.smallest_mtu > mtu)) {
4552                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4553                                                 net->mtu = mtu;
4554                                                 if (net->port) {
4555                                                         net->mtu -= sizeof(struct udphdr);
4556                                                 }
4557                                         }
4558                                 } else if (ifp) {
4559                                         if (ND_IFINFO(ifp)->linkmtu &&
4560                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4561                                                 sctp_mtu_size_reset(inp,
4562                                                     &stcb->asoc,
4563                                                     ND_IFINFO(ifp)->linkmtu);
4564                                         }
4565                                 }
4566                         }
4567                         return (ret);
4568                 }
4569 #endif
4570         default:
4571                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4572                     ((struct sockaddr *)to)->sa_family);
4573                 sctp_m_freem(m);
4574                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4575                 return (EFAULT);
4576         }
4577 }
4578
4579
4580 void
4581 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4582 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4583     SCTP_UNUSED
4584 #endif
4585 )
4586 {
4587         struct mbuf *m, *m_at, *mp_last;
4588         struct sctp_nets *net;
4589         struct sctp_init_chunk *init;
4590         struct sctp_supported_addr_param *sup_addr;
4591         struct sctp_adaptation_layer_indication *ali;
4592         struct sctp_ecn_supported_param *ecn;
4593         struct sctp_prsctp_supported_param *prsctp;
4594         struct sctp_supported_chunk_types_param *pr_supported;
4595         int cnt_inits_to = 0;
4596         int padval, ret;
4597         int num_ext;
4598         int p_len;
4599
4600         /* INIT's always go to the primary (and usually ONLY address) */
4601         mp_last = NULL;
4602         net = stcb->asoc.primary_destination;
4603         if (net == NULL) {
4604                 net = TAILQ_FIRST(&stcb->asoc.nets);
4605                 if (net == NULL) {
4606                         /* TSNH */
4607                         return;
4608                 }
4609                 /* we confirm any address we send an INIT to */
4610                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4611                 (void)sctp_set_primary_addr(stcb, NULL, net);
4612         } else {
4613                 /* we confirm any address we send an INIT to */
4614                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4615         }
4616         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4617 #ifdef INET6
4618         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4619                 /*
4620                  * special hook, if we are sending to link local it will not
4621                  * show up in our private address count.
4622                  */
4623                 struct sockaddr_in6 *sin6l;
4624
4625                 sin6l = &net->ro._l_addr.sin6;
4626                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4627                         cnt_inits_to = 1;
4628         }
4629 #endif
4630         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4631                 /* This case should not happen */
4632                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4633                 return;
4634         }
4635         /* start the INIT timer */
4636         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4637
4638         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4639         if (m == NULL) {
4640                 /* No memory, INIT timer will re-attempt. */
4641                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4642                 return;
4643         }
4644         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4645         /*
4646          * assume peer supports asconf in order to be able to queue local
4647          * address changes while an INIT is in flight and before the assoc
4648          * is established.
4649          */
4650         stcb->asoc.peer_supports_asconf = 1;
4651         /* Now lets put the SCTP header in place */
4652         init = mtod(m, struct sctp_init_chunk *);
4653         /* now the chunk header */
4654         init->ch.chunk_type = SCTP_INITIATION;
4655         init->ch.chunk_flags = 0;
4656         /* fill in later from mbuf we build */
4657         init->ch.chunk_length = 0;
4658         /* place in my tag */
4659         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4660         /* set up some of the credits. */
4661         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4662             SCTP_MINIMAL_RWND));
4663
4664         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4665         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4666         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4667         /* now the address restriction */
4668         /* XXX Should we take the address family of the socket into account? */
4669         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4670             sizeof(*init));
4671         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4672 #ifdef INET6
4673 #ifdef INET
4674         /* we support 2 types: IPv4/IPv6 */
4675         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4676         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4677         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4678 #else
4679         /* we support 1 type: IPv6 */
4680         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4681         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4682         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4683 #endif
4684 #else
4685         /* we support 1 type: IPv4 */
4686         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4687         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4688         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4689 #endif
4690         SCTP_BUF_LEN(m) += sizeof(struct sctp_supported_addr_param);
4691         /* adaptation layer indication parameter */
4692         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(struct sctp_supported_addr_param));
4693         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4694         ali->ph.param_length = htons(sizeof(*ali));
4695         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4696         SCTP_BUF_LEN(m) += sizeof(*ali);
4697         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4698
4699         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4700                 /* Add NAT friendly parameter */
4701                 struct sctp_paramhdr *ph;
4702
4703                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4704                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4705                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4706                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4707                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4708         }
4709         /* now any cookie time extensions */
4710         if (stcb->asoc.cookie_preserve_req) {
4711                 struct sctp_cookie_perserve_param *cookie_preserve;
4712
4713                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4714                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4715                 cookie_preserve->ph.param_length = htons(
4716                     sizeof(*cookie_preserve));
4717                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4718                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4719                 ecn = (struct sctp_ecn_supported_param *)(
4720                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4721                 stcb->asoc.cookie_preserve_req = 0;
4722         }
4723         /* ECN parameter */
4724         if (stcb->asoc.ecn_allowed == 1) {
4725                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4726                 ecn->ph.param_length = htons(sizeof(*ecn));
4727                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4728                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4729                     sizeof(*ecn));
4730         } else {
4731                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4732         }
4733         /* And now tell the peer we do pr-sctp */
4734         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4735         prsctp->ph.param_length = htons(sizeof(*prsctp));
4736         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4737
4738         /* And now tell the peer we do all the extensions */
4739         pr_supported = (struct sctp_supported_chunk_types_param *)
4740             ((caddr_t)prsctp + sizeof(*prsctp));
4741         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4742         num_ext = 0;
4743         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4744         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4745         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4746         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4747         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4748         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4749                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4750         }
4751         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4752                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4753         }
4754         p_len = sizeof(*pr_supported) + num_ext;
4755         pr_supported->ph.param_length = htons(p_len);
4756         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4757         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4758
4759
4760         /* add authentication parameters */
4761         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4762                 struct sctp_auth_random *randp;
4763                 struct sctp_auth_hmac_algo *hmacs;
4764                 struct sctp_auth_chunk_list *chunks;
4765
4766                 /* attach RANDOM parameter, if available */
4767                 if (stcb->asoc.authinfo.random != NULL) {
4768                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4769                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4770                         /* random key already contains the header */
4771                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4772                         /* zero out any padding required */
4773                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4774                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4775                 }
4776                 /* add HMAC_ALGO parameter */
4777                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4778                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4779                     (uint8_t *) hmacs->hmac_ids);
4780                 if (p_len > 0) {
4781                         p_len += sizeof(*hmacs);
4782                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4783                         hmacs->ph.param_length = htons(p_len);
4784                         /* zero out any padding required */
4785                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4786                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4787                 }
4788                 /* add CHUNKS parameter */
4789                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4790                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4791                     chunks->chunk_types);
4792                 if (p_len > 0) {
4793                         p_len += sizeof(*chunks);
4794                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4795                         chunks->ph.param_length = htons(p_len);
4796                         /* zero out any padding required */
4797                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4798                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4799                 }
4800         }
4801         /* now the addresses */
4802         {
4803                 struct sctp_scoping scp;
4804
4805                 /*
4806                  * To optimize this we could put the scoping stuff into a
4807                  * structure and remove the individual uint8's from the
4808                  * assoc structure. Then we could just sifa in the address
4809                  * within the stcb. But for now this is a quick hack to get
4810                  * the address stuff teased apart.
4811                  */
4812
4813                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4814                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4815                 scp.loopback_scope = stcb->asoc.loopback_scope;
4816                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4817                 scp.local_scope = stcb->asoc.local_scope;
4818                 scp.site_scope = stcb->asoc.site_scope;
4819
4820                 sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to);
4821         }
4822
4823         /* calulate the size and update pkt header and chunk header */
4824         p_len = 0;
4825         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4826                 if (SCTP_BUF_NEXT(m_at) == NULL)
4827                         mp_last = m_at;
4828                 p_len += SCTP_BUF_LEN(m_at);
4829         }
4830         init->ch.chunk_length = htons(p_len);
4831         /*
4832          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4833          * here since the timer will drive a retranmission.
4834          */
4835
4836         /* I don't expect this to execute but we will be safe here */
4837         padval = p_len % 4;
4838         if ((padval) && (mp_last)) {
4839                 /*
4840                  * The compiler worries that mp_last may not be set even
4841                  * though I think it is impossible :-> however we add
4842                  * mp_last here just in case.
4843                  */
4844                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4845                 if (ret) {
4846                         /* Houston we have a problem, no space */
4847                         sctp_m_freem(m);
4848                         return;
4849                 }
4850         }
4851         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4852         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4853             (struct sockaddr *)&net->ro._l_addr,
4854             m, 0, NULL, 0, 0, 0, 0,
4855             inp->sctp_lport, stcb->rport, htonl(0),
4856             net->port, so_locked, NULL, NULL);
4857         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4858         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4859         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4860 }
4861
4862 struct mbuf *
4863 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4864     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4865 {
4866         /*
4867          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4868          * being equal to the beginning of the params i.e. (iphlen +
4869          * sizeof(struct sctp_init_msg) parse through the parameters to the
4870          * end of the mbuf verifying that all parameters are known.
4871          *
4872          * For unknown parameters build and return a mbuf with
4873          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4874          * processing this chunk stop, and set *abort_processing to 1.
4875          *
4876          * By having param_offset be pre-set to where parameters begin it is
4877          * hoped that this routine may be reused in the future by new
4878          * features.
4879          */
4880         struct sctp_paramhdr *phdr, params;
4881
4882         struct mbuf *mat, *op_err;
4883         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4884         int at, limit, pad_needed;
4885         uint16_t ptype, plen, padded_size;
4886         int err_at;
4887
4888         *abort_processing = 0;
4889         mat = in_initpkt;
4890         err_at = 0;
4891         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4892         at = param_offset;
4893         op_err = NULL;
4894         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4895         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4896         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4897                 ptype = ntohs(phdr->param_type);
4898                 plen = ntohs(phdr->param_length);
4899                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4900                         /* wacked parameter */
4901                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4902                         goto invalid_size;
4903                 }
4904                 limit -= SCTP_SIZE32(plen);
4905                 /*-
4906                  * All parameters for all chunks that we know/understand are
4907                  * listed here. We process them other places and make
4908                  * appropriate stop actions per the upper bits. However this
4909                  * is the generic routine processor's can call to get back
4910                  * an operr.. to either incorporate (init-ack) or send.
4911                  */
4912                 padded_size = SCTP_SIZE32(plen);
4913                 switch (ptype) {
4914                         /* Param's with variable size */
4915                 case SCTP_HEARTBEAT_INFO:
4916                 case SCTP_STATE_COOKIE:
4917                 case SCTP_UNRECOG_PARAM:
4918                 case SCTP_ERROR_CAUSE_IND:
4919                         /* ok skip fwd */
4920                         at += padded_size;
4921                         break;
4922                         /* Param's with variable size within a range */
4923                 case SCTP_CHUNK_LIST:
4924                 case SCTP_SUPPORTED_CHUNK_EXT:
4925                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4926                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4927                                 goto invalid_size;
4928                         }
4929                         at += padded_size;
4930                         break;
4931                 case SCTP_SUPPORTED_ADDRTYPE:
4932                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4933                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4934                                 goto invalid_size;
4935                         }
4936                         at += padded_size;
4937                         break;
4938                 case SCTP_RANDOM:
4939                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4940                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4941                                 goto invalid_size;
4942                         }
4943                         at += padded_size;
4944                         break;
4945                 case SCTP_SET_PRIM_ADDR:
4946                 case SCTP_DEL_IP_ADDRESS:
4947                 case SCTP_ADD_IP_ADDRESS:
4948                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4949                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4950                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4951                                 goto invalid_size;
4952                         }
4953                         at += padded_size;
4954                         break;
4955                         /* Param's with a fixed size */
4956                 case SCTP_IPV4_ADDRESS:
4957                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4958                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4959                                 goto invalid_size;
4960                         }
4961                         at += padded_size;
4962                         break;
4963                 case SCTP_IPV6_ADDRESS:
4964                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4965                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4966                                 goto invalid_size;
4967                         }
4968                         at += padded_size;
4969                         break;
4970                 case SCTP_COOKIE_PRESERVE:
4971                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4972                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4973                                 goto invalid_size;
4974                         }
4975                         at += padded_size;
4976                         break;
4977                 case SCTP_HAS_NAT_SUPPORT:
4978                         *nat_friendly = 1;
4979                         /* fall through */
4980                 case SCTP_PRSCTP_SUPPORTED:
4981
4982                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4983                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4984                                 goto invalid_size;
4985                         }
4986                         at += padded_size;
4987                         break;
4988                 case SCTP_ECN_CAPABLE:
4989                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4990                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4991                                 goto invalid_size;
4992                         }
4993                         at += padded_size;
4994                         break;
4995                 case SCTP_ULP_ADAPTATION:
4996                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4997                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4998                                 goto invalid_size;
4999                         }
5000                         at += padded_size;
5001                         break;
5002                 case SCTP_SUCCESS_REPORT:
5003                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5004                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5005                                 goto invalid_size;
5006                         }
5007                         at += padded_size;
5008                         break;
5009                 case SCTP_HOSTNAME_ADDRESS:
5010                         {
5011                                 /* We can NOT handle HOST NAME addresses!! */
5012                                 int l_len;
5013
5014                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5015                                 *abort_processing = 1;
5016                                 if (op_err == NULL) {
5017                                         /* Ok need to try to get a mbuf */
5018 #ifdef INET6
5019                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5020 #else
5021                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5022 #endif
5023                                         l_len += plen;
5024                                         l_len += sizeof(struct sctp_paramhdr);
5025                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5026                                         if (op_err) {
5027                                                 SCTP_BUF_LEN(op_err) = 0;
5028                                                 /*
5029                                                  * pre-reserve space for ip
5030                                                  * and sctp header  and
5031                                                  * chunk hdr
5032                                                  */
5033 #ifdef INET6
5034                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5035 #else
5036                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5037 #endif
5038                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5039                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5040                                         }
5041                                 }
5042                                 if (op_err) {
5043                                         /* If we have space */
5044                                         struct sctp_paramhdr s;
5045
5046                                         if (err_at % 4) {
5047                                                 uint32_t cpthis = 0;
5048
5049                                                 pad_needed = 4 - (err_at % 4);
5050                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5051                                                 err_at += pad_needed;
5052                                         }
5053                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5054                                         s.param_length = htons(sizeof(s) + plen);
5055                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5056                                         err_at += sizeof(s);
5057                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5058                                         if (phdr == NULL) {
5059                                                 sctp_m_freem(op_err);
5060                                                 /*
5061                                                  * we are out of memory but
5062                                                  * we still need to have a
5063                                                  * look at what to do (the
5064                                                  * system is in trouble
5065                                                  * though).
5066                                                  */
5067                                                 return (NULL);
5068                                         }
5069                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5070                                 }
5071                                 return (op_err);
5072                                 break;
5073                         }
5074                 default:
5075                         /*
5076                          * we do not recognize the parameter figure out what
5077                          * we do.
5078                          */
5079                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5080                         if ((ptype & 0x4000) == 0x4000) {
5081                                 /* Report bit is set?? */
5082                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5083                                 if (op_err == NULL) {
5084                                         int l_len;
5085
5086                                         /* Ok need to try to get an mbuf */
5087 #ifdef INET6
5088                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5089 #else
5090                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5091 #endif
5092                                         l_len += plen;
5093                                         l_len += sizeof(struct sctp_paramhdr);
5094                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5095                                         if (op_err) {
5096                                                 SCTP_BUF_LEN(op_err) = 0;
5097 #ifdef INET6
5098                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5099 #else
5100                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5101 #endif
5102                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5103                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5104                                         }
5105                                 }
5106                                 if (op_err) {
5107                                         /* If we have space */
5108                                         struct sctp_paramhdr s;
5109
5110                                         if (err_at % 4) {
5111                                                 uint32_t cpthis = 0;
5112
5113                                                 pad_needed = 4 - (err_at % 4);
5114                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5115                                                 err_at += pad_needed;
5116                                         }
5117                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5118                                         s.param_length = htons(sizeof(s) + plen);
5119                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5120                                         err_at += sizeof(s);
5121                                         if (plen > sizeof(tempbuf)) {
5122                                                 plen = sizeof(tempbuf);
5123                                         }
5124                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5125                                         if (phdr == NULL) {
5126                                                 sctp_m_freem(op_err);
5127                                                 /*
5128                                                  * we are out of memory but
5129                                                  * we still need to have a
5130                                                  * look at what to do (the
5131                                                  * system is in trouble
5132                                                  * though).
5133                                                  */
5134                                                 op_err = NULL;
5135                                                 goto more_processing;
5136                                         }
5137                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5138                                         err_at += plen;
5139                                 }
5140                         }
5141         more_processing:
5142                         if ((ptype & 0x8000) == 0x0000) {
5143                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5144                                 return (op_err);
5145                         } else {
5146                                 /* skip this chunk and continue processing */
5147                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5148                                 at += SCTP_SIZE32(plen);
5149                         }
5150                         break;
5151
5152                 }
5153                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5154         }
5155         return (op_err);
5156 invalid_size:
5157         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5158         *abort_processing = 1;
5159         if ((op_err == NULL) && phdr) {
5160                 int l_len;
5161
5162 #ifdef INET6
5163                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5164 #else
5165                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5166 #endif
5167                 l_len += (2 * sizeof(struct sctp_paramhdr));
5168                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5169                 if (op_err) {
5170                         SCTP_BUF_LEN(op_err) = 0;
5171 #ifdef INET6
5172                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5173 #else
5174                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5175 #endif
5176                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5177                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5178                 }
5179         }
5180         if ((op_err) && phdr) {
5181                 struct sctp_paramhdr s;
5182
5183                 if (err_at % 4) {
5184                         uint32_t cpthis = 0;
5185
5186                         pad_needed = 4 - (err_at % 4);
5187                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5188                         err_at += pad_needed;
5189                 }
5190                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5191                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5192                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5193                 err_at += sizeof(s);
5194                 /* Only copy back the p-hdr that caused the issue */
5195                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5196         }
5197         return (op_err);
5198 }
5199
5200 static int
5201 sctp_are_there_new_addresses(struct sctp_association *asoc,
5202     struct mbuf *in_initpkt, int offset)
5203 {
5204         /*
5205          * Given a INIT packet, look through the packet to verify that there
5206          * are NO new addresses. As we go through the parameters add reports
5207          * of any un-understood parameters that require an error.  Also we
5208          * must return (1) to drop the packet if we see a un-understood
5209          * parameter that tells us to drop the chunk.
5210          */
5211         struct sockaddr *sa_touse;
5212         struct sockaddr *sa;
5213         struct sctp_paramhdr *phdr, params;
5214         uint16_t ptype, plen;
5215         uint8_t fnd;
5216         struct sctp_nets *net;
5217         struct ip *iph;
5218
5219 #ifdef INET
5220         struct sockaddr_in sin4, *sa4;
5221
5222 #endif
5223 #ifdef INET6
5224         struct sockaddr_in6 sin6, *sa6;
5225         struct ip6_hdr *ip6h;
5226
5227 #endif
5228
5229 #ifdef INET
5230         memset(&sin4, 0, sizeof(sin4));
5231         sin4.sin_family = AF_INET;
5232         sin4.sin_len = sizeof(sin4);
5233 #endif
5234 #ifdef INET6
5235         memset(&sin6, 0, sizeof(sin6));
5236         sin6.sin6_family = AF_INET6;
5237         sin6.sin6_len = sizeof(sin6);
5238 #endif
5239         sa_touse = NULL;
5240         /* First what about the src address of the pkt ? */
5241         iph = mtod(in_initpkt, struct ip *);
5242         switch (iph->ip_v) {
5243 #ifdef INET
5244         case IPVERSION:
5245                 /* source addr is IPv4 */
5246                 sin4.sin_addr = iph->ip_src;
5247                 sa_touse = (struct sockaddr *)&sin4;
5248                 break;
5249 #endif
5250 #ifdef INET6
5251         case IPV6_VERSION >> 4:
5252                 /* source addr is IPv6 */
5253                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
5254                 sin6.sin6_addr = ip6h->ip6_src;
5255                 sa_touse = (struct sockaddr *)&sin6;
5256                 break;
5257 #endif
5258         default:
5259                 return (1);
5260         }
5261
5262         fnd = 0;
5263         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5264                 sa = (struct sockaddr *)&net->ro._l_addr;
5265                 if (sa->sa_family == sa_touse->sa_family) {
5266 #ifdef INET
5267                         if (sa->sa_family == AF_INET) {
5268                                 sa4 = (struct sockaddr_in *)sa;
5269                                 if (sa4->sin_addr.s_addr == sin4.sin_addr.s_addr) {
5270                                         fnd = 1;
5271                                         break;
5272                                 }
5273                         }
5274 #endif
5275 #ifdef INET6
5276                         if (sa->sa_family == AF_INET6) {
5277                                 sa6 = (struct sockaddr_in6 *)sa;
5278                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, &sin6)) {
5279                                         fnd = 1;
5280                                         break;
5281                                 }
5282                         }
5283 #endif
5284                 }
5285         }
5286         if (fnd == 0) {
5287                 /* New address added! no need to look futher. */
5288                 return (1);
5289         }
5290         /* Ok so far lets munge through the rest of the packet */
5291         offset += sizeof(struct sctp_init_chunk);
5292         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5293         while (phdr) {
5294                 sa_touse = NULL;
5295                 ptype = ntohs(phdr->param_type);
5296                 plen = ntohs(phdr->param_length);
5297                 switch (ptype) {
5298 #ifdef INET
5299                 case SCTP_IPV4_ADDRESS:
5300                         {
5301                                 struct sctp_ipv4addr_param *p4, p4_buf;
5302
5303                                 phdr = sctp_get_next_param(in_initpkt, offset,
5304                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5305                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5306                                     phdr == NULL) {
5307                                         return (1);
5308                                 }
5309                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5310                                 sin4.sin_addr.s_addr = p4->addr;
5311                                 sa_touse = (struct sockaddr *)&sin4;
5312                                 break;
5313                         }
5314 #endif
5315 #ifdef INET6
5316                 case SCTP_IPV6_ADDRESS:
5317                         {
5318                                 struct sctp_ipv6addr_param *p6, p6_buf;
5319
5320                                 phdr = sctp_get_next_param(in_initpkt, offset,
5321                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5322                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5323                                     phdr == NULL) {
5324                                         return (1);
5325                                 }
5326                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5327                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5328                                     sizeof(p6->addr));
5329                                 sa_touse = (struct sockaddr *)&sin6;
5330                                 break;
5331                         }
5332 #endif
5333                 default:
5334                         sa_touse = NULL;
5335                         break;
5336                 }
5337                 if (sa_touse) {
5338                         /* ok, sa_touse points to one to check */
5339                         fnd = 0;
5340                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5341                                 sa = (struct sockaddr *)&net->ro._l_addr;
5342                                 if (sa->sa_family != sa_touse->sa_family) {
5343                                         continue;
5344                                 }
5345 #ifdef INET
5346                                 if (sa->sa_family == AF_INET) {
5347                                         sa4 = (struct sockaddr_in *)sa;
5348                                         if (sa4->sin_addr.s_addr ==
5349                                             sin4.sin_addr.s_addr) {
5350                                                 fnd = 1;
5351                                                 break;
5352                                         }
5353                                 }
5354 #endif
5355 #ifdef INET6
5356                                 if (sa->sa_family == AF_INET6) {
5357                                         sa6 = (struct sockaddr_in6 *)sa;
5358                                         if (SCTP6_ARE_ADDR_EQUAL(
5359                                             sa6, &sin6)) {
5360                                                 fnd = 1;
5361                                                 break;
5362                                         }
5363                                 }
5364 #endif
5365                         }
5366                         if (!fnd) {
5367                                 /* New addr added! no need to look further */
5368                                 return (1);
5369                         }
5370                 }
5371                 offset += SCTP_SIZE32(plen);
5372                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5373         }
5374         return (0);
5375 }
5376
5377 /*
5378  * Given a MBUF chain that was sent into us containing an INIT. Build a
5379  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5380  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5381  * message (i.e. the struct sctp_init_msg).
5382  */
5383 void
5384 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5385     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
5386     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5387 {
5388         struct sctp_association *asoc;
5389         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5390         struct sctp_init_ack_chunk *initack;
5391         struct sctp_adaptation_layer_indication *ali;
5392         struct sctp_ecn_supported_param *ecn;
5393         struct sctp_prsctp_supported_param *prsctp;
5394         struct sctp_supported_chunk_types_param *pr_supported;
5395         union sctp_sockstore store, store1, *over_addr;
5396
5397 #ifdef INET
5398         struct sockaddr_in *sin, *to_sin;
5399
5400 #endif
5401 #ifdef INET6
5402         struct sockaddr_in6 *sin6, *to_sin6;
5403
5404 #endif
5405         struct ip *iph;
5406
5407 #ifdef INET6
5408         struct ip6_hdr *ip6;
5409
5410 #endif
5411         struct sockaddr *to;
5412         struct sctp_state_cookie stc;
5413         struct sctp_nets *net = NULL;
5414         uint8_t *signature = NULL;
5415         int cnt_inits_to = 0;
5416         uint16_t his_limit, i_want;
5417         int abort_flag, padval;
5418         int num_ext;
5419         int p_len;
5420         int nat_friendly = 0;
5421         struct socket *so;
5422
5423         if (stcb)
5424                 asoc = &stcb->asoc;
5425         else
5426                 asoc = NULL;
5427         mp_last = NULL;
5428         if ((asoc != NULL) &&
5429             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5430             (sctp_are_there_new_addresses(asoc, init_pkt, offset))) {
5431                 /* new addresses, out of here in non-cookie-wait states */
5432                 /*
5433                  * Send a ABORT, we don't add the new address error clause
5434                  * though we even set the T bit and copy in the 0 tag.. this
5435                  * looks no different than if no listener was present.
5436                  */
5437                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
5438                 return;
5439         }
5440         abort_flag = 0;
5441         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5442             (offset + sizeof(struct sctp_init_chunk)),
5443             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5444         if (abort_flag) {
5445 do_a_abort:
5446                 sctp_send_abort(init_pkt, iphlen, sh,
5447                     init_chk->init.initiate_tag, op_err, vrf_id, port);
5448                 return;
5449         }
5450         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5451         if (m == NULL) {
5452                 /* No memory, INIT timer will re-attempt. */
5453                 if (op_err)
5454                         sctp_m_freem(op_err);
5455                 return;
5456         }
5457         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5458
5459         /* the time I built cookie */
5460         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5461
5462         /* populate any tie tags */
5463         if (asoc != NULL) {
5464                 /* unlock before tag selections */
5465                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5466                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5467                 stc.cookie_life = asoc->cookie_life;
5468                 net = asoc->primary_destination;
5469         } else {
5470                 stc.tie_tag_my_vtag = 0;
5471                 stc.tie_tag_peer_vtag = 0;
5472                 /* life I will award this cookie */
5473                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5474         }
5475
5476         /* copy in the ports for later check */
5477         stc.myport = sh->dest_port;
5478         stc.peerport = sh->src_port;
5479
5480         /*
5481          * If we wanted to honor cookie life extentions, we would add to
5482          * stc.cookie_life. For now we should NOT honor any extension
5483          */
5484         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5485         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5486                 struct inpcb *in_inp;
5487
5488                 /* Its a V6 socket */
5489                 in_inp = (struct inpcb *)inp;
5490                 stc.ipv6_addr_legal = 1;
5491                 /* Now look at the binding flag to see if V4 will be legal */
5492                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5493                         stc.ipv4_addr_legal = 1;
5494                 } else {
5495                         /* V4 addresses are NOT legal on the association */
5496                         stc.ipv4_addr_legal = 0;
5497                 }
5498         } else {
5499                 /* Its a V4 socket, no - V6 */
5500                 stc.ipv4_addr_legal = 1;
5501                 stc.ipv6_addr_legal = 0;
5502         }
5503
5504 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5505         stc.ipv4_scope = 1;
5506 #else
5507         stc.ipv4_scope = 0;
5508 #endif
5509         /* now for scope setup */
5510         memset((caddr_t)&store, 0, sizeof(store));
5511         memset((caddr_t)&store1, 0, sizeof(store1));
5512 #ifdef INET
5513         sin = &store.sin;
5514         to_sin = &store1.sin;
5515 #endif
5516 #ifdef INET6
5517         sin6 = &store.sin6;
5518         to_sin6 = &store1.sin6;
5519 #endif
5520         iph = mtod(init_pkt, struct ip *);
5521         /* establish the to_addr's */
5522         switch (iph->ip_v) {
5523 #ifdef INET
5524         case IPVERSION:
5525                 to_sin->sin_port = sh->dest_port;
5526                 to_sin->sin_family = AF_INET;
5527                 to_sin->sin_len = sizeof(struct sockaddr_in);
5528                 to_sin->sin_addr = iph->ip_dst;
5529                 break;
5530 #endif
5531 #ifdef INET6
5532         case IPV6_VERSION >> 4:
5533                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5534                 to_sin6->sin6_addr = ip6->ip6_dst;
5535                 to_sin6->sin6_scope_id = 0;
5536                 to_sin6->sin6_port = sh->dest_port;
5537                 to_sin6->sin6_family = AF_INET6;
5538                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5539                 break;
5540 #endif
5541         default:
5542                 goto do_a_abort;
5543                 break;
5544         }
5545
5546         if (net == NULL) {
5547                 to = (struct sockaddr *)&store;
5548                 switch (iph->ip_v) {
5549 #ifdef INET
5550                 case IPVERSION:
5551                         {
5552                                 sin->sin_family = AF_INET;
5553                                 sin->sin_len = sizeof(struct sockaddr_in);
5554                                 sin->sin_port = sh->src_port;
5555                                 sin->sin_addr = iph->ip_src;
5556                                 /* lookup address */
5557                                 stc.address[0] = sin->sin_addr.s_addr;
5558                                 stc.address[1] = 0;
5559                                 stc.address[2] = 0;
5560                                 stc.address[3] = 0;
5561                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5562                                 /* local from address */
5563                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5564                                 stc.laddress[1] = 0;
5565                                 stc.laddress[2] = 0;
5566                                 stc.laddress[3] = 0;
5567                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5568                                 /* scope_id is only for v6 */
5569                                 stc.scope_id = 0;
5570 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5571                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5572                                         stc.ipv4_scope = 1;
5573                                 }
5574 #else
5575                                 stc.ipv4_scope = 1;
5576 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5577                                 /* Must use the address in this case */
5578                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5579                                         stc.loopback_scope = 1;
5580                                         stc.ipv4_scope = 1;
5581                                         stc.site_scope = 1;
5582                                         stc.local_scope = 0;
5583                                 }
5584                                 break;
5585                         }
5586 #endif
5587 #ifdef INET6
5588                 case IPV6_VERSION >> 4:
5589                         {
5590                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5591                                 sin6->sin6_family = AF_INET6;
5592                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5593                                 sin6->sin6_port = sh->src_port;
5594                                 sin6->sin6_addr = ip6->ip6_src;
5595                                 /* lookup address */
5596                                 memcpy(&stc.address, &sin6->sin6_addr,
5597                                     sizeof(struct in6_addr));
5598                                 sin6->sin6_scope_id = 0;
5599                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5600                                 stc.scope_id = 0;
5601                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5602                                         /*
5603                                          * FIX ME: does this have scope from
5604                                          * rcvif?
5605                                          */
5606                                         (void)sa6_recoverscope(sin6);
5607                                         stc.scope_id = sin6->sin6_scope_id;
5608                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5609                                         stc.loopback_scope = 1;
5610                                         stc.local_scope = 0;
5611                                         stc.site_scope = 1;
5612                                         stc.ipv4_scope = 1;
5613                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5614                                         /*
5615                                          * If the new destination is a
5616                                          * LINK_LOCAL we must have common
5617                                          * both site and local scope. Don't
5618                                          * set local scope though since we
5619                                          * must depend on the source to be
5620                                          * added implicitly. We cannot
5621                                          * assure just because we share one
5622                                          * link that all links are common.
5623                                          */
5624                                         stc.local_scope = 0;
5625                                         stc.site_scope = 1;
5626                                         stc.ipv4_scope = 1;
5627                                         /*
5628                                          * we start counting for the private
5629                                          * address stuff at 1. since the
5630                                          * link local we source from won't
5631                                          * show up in our scoped count.
5632                                          */
5633                                         cnt_inits_to = 1;
5634                                         /*
5635                                          * pull out the scope_id from
5636                                          * incoming pkt
5637                                          */
5638                                         /*
5639                                          * FIX ME: does this have scope from
5640                                          * rcvif?
5641                                          */
5642                                         (void)sa6_recoverscope(sin6);
5643                                         stc.scope_id = sin6->sin6_scope_id;
5644                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5645                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5646                                         /*
5647                                          * If the new destination is
5648                                          * SITE_LOCAL then we must have site
5649                                          * scope in common.
5650                                          */
5651                                         stc.site_scope = 1;
5652                                 }
5653                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5654                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5655                                 break;
5656                         }
5657 #endif
5658                 default:
5659                         /* TSNH */
5660                         goto do_a_abort;
5661                         break;
5662                 }
5663         } else {
5664                 /* set the scope per the existing tcb */
5665
5666 #ifdef INET6
5667                 struct sctp_nets *lnet;
5668
5669 #endif
5670
5671                 stc.loopback_scope = asoc->loopback_scope;
5672                 stc.ipv4_scope = asoc->ipv4_local_scope;
5673                 stc.site_scope = asoc->site_scope;
5674                 stc.local_scope = asoc->local_scope;
5675 #ifdef INET6
5676                 /* Why do we not consider IPv4 LL addresses? */
5677                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5678                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5679                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5680                                         /*
5681                                          * if we have a LL address, start
5682                                          * counting at 1.
5683                                          */
5684                                         cnt_inits_to = 1;
5685                                 }
5686                         }
5687                 }
5688 #endif
5689                 /* use the net pointer */
5690                 to = (struct sockaddr *)&net->ro._l_addr;
5691                 switch (to->sa_family) {
5692 #ifdef INET
5693                 case AF_INET:
5694                         sin = (struct sockaddr_in *)to;
5695                         stc.address[0] = sin->sin_addr.s_addr;
5696                         stc.address[1] = 0;
5697                         stc.address[2] = 0;
5698                         stc.address[3] = 0;
5699                         stc.addr_type = SCTP_IPV4_ADDRESS;
5700                         if (net->src_addr_selected == 0) {
5701                                 /*
5702                                  * strange case here, the INIT should have
5703                                  * did the selection.
5704                                  */
5705                                 net->ro._s_addr = sctp_source_address_selection(inp,
5706                                     stcb, (sctp_route_t *) & net->ro,
5707                                     net, 0, vrf_id);
5708                                 if (net->ro._s_addr == NULL)
5709                                         return;
5710
5711                                 net->src_addr_selected = 1;
5712
5713                         }
5714                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5715                         stc.laddress[1] = 0;
5716                         stc.laddress[2] = 0;
5717                         stc.laddress[3] = 0;
5718                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5719                         /* scope_id is only for v6 */
5720                         stc.scope_id = 0;
5721                         break;
5722 #endif
5723 #ifdef INET6
5724                 case AF_INET6:
5725                         sin6 = (struct sockaddr_in6 *)to;
5726                         memcpy(&stc.address, &sin6->sin6_addr,
5727                             sizeof(struct in6_addr));
5728                         stc.addr_type = SCTP_IPV6_ADDRESS;
5729                         stc.scope_id = sin6->sin6_scope_id;
5730                         if (net->src_addr_selected == 0) {
5731                                 /*
5732                                  * strange case here, the INIT should have
5733                                  * did the selection.
5734                                  */
5735                                 net->ro._s_addr = sctp_source_address_selection(inp,
5736                                     stcb, (sctp_route_t *) & net->ro,
5737                                     net, 0, vrf_id);
5738                                 if (net->ro._s_addr == NULL)
5739                                         return;
5740
5741                                 net->src_addr_selected = 1;
5742                         }
5743                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5744                             sizeof(struct in6_addr));
5745                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5746                         break;
5747 #endif
5748                 }
5749         }
5750         /* Now lets put the SCTP header in place */
5751         initack = mtod(m, struct sctp_init_ack_chunk *);
5752         /* Save it off for quick ref */
5753         stc.peers_vtag = init_chk->init.initiate_tag;
5754         /* who are we */
5755         memcpy(stc.identification, SCTP_VERSION_STRING,
5756             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5757         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5758         /* now the chunk header */
5759         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5760         initack->ch.chunk_flags = 0;
5761         /* fill in later from mbuf we build */
5762         initack->ch.chunk_length = 0;
5763         /* place in my tag */
5764         if ((asoc != NULL) &&
5765             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5766             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5767             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5768                 /* re-use the v-tags and init-seq here */
5769                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5770                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5771         } else {
5772                 uint32_t vtag, itsn;
5773
5774                 if (hold_inp_lock) {
5775                         SCTP_INP_INCR_REF(inp);
5776                         SCTP_INP_RUNLOCK(inp);
5777                 }
5778                 if (asoc) {
5779                         atomic_add_int(&asoc->refcnt, 1);
5780                         SCTP_TCB_UNLOCK(stcb);
5781         new_tag:
5782                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5783                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5784                                 /*
5785                                  * Got a duplicate vtag on some guy behind a
5786                                  * nat make sure we don't use it.
5787                                  */
5788                                 goto new_tag;
5789                         }
5790                         initack->init.initiate_tag = htonl(vtag);
5791                         /* get a TSN to use too */
5792                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5793                         initack->init.initial_tsn = htonl(itsn);
5794                         SCTP_TCB_LOCK(stcb);
5795                         atomic_add_int(&asoc->refcnt, -1);
5796                 } else {
5797                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5798                         initack->init.initiate_tag = htonl(vtag);
5799                         /* get a TSN to use too */
5800                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5801                 }
5802                 if (hold_inp_lock) {
5803                         SCTP_INP_RLOCK(inp);
5804                         SCTP_INP_DECR_REF(inp);
5805                 }
5806         }
5807         /* save away my tag to */
5808         stc.my_vtag = initack->init.initiate_tag;
5809
5810         /* set up some of the credits. */
5811         so = inp->sctp_socket;
5812         if (so == NULL) {
5813                 /* memory problem */
5814                 sctp_m_freem(m);
5815                 return;
5816         } else {
5817                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5818         }
5819         /* set what I want */
5820         his_limit = ntohs(init_chk->init.num_inbound_streams);
5821         /* choose what I want */
5822         if (asoc != NULL) {
5823                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5824                         i_want = asoc->streamoutcnt;
5825                 } else {
5826                         i_want = inp->sctp_ep.pre_open_stream_count;
5827                 }
5828         } else {
5829                 i_want = inp->sctp_ep.pre_open_stream_count;
5830         }
5831         if (his_limit < i_want) {
5832                 /* I Want more :< */
5833                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5834         } else {
5835                 /* I can have what I want :> */
5836                 initack->init.num_outbound_streams = htons(i_want);
5837         }
5838         /* tell him his limt. */
5839         initack->init.num_inbound_streams =
5840             htons(inp->sctp_ep.max_open_streams_intome);
5841
5842         /* adaptation layer indication parameter */
5843         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5844         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5845         ali->ph.param_length = htons(sizeof(*ali));
5846         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5847         SCTP_BUF_LEN(m) += sizeof(*ali);
5848         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5849
5850         /* ECN parameter */
5851         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5852             (inp->sctp_ecn_enable == 1)) {
5853                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5854                 ecn->ph.param_length = htons(sizeof(*ecn));
5855                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5856
5857                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5858                     sizeof(*ecn));
5859         } else {
5860                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5861         }
5862         /* And now tell the peer we do  pr-sctp */
5863         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5864         prsctp->ph.param_length = htons(sizeof(*prsctp));
5865         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5866         if (nat_friendly) {
5867                 /* Add NAT friendly parameter */
5868                 struct sctp_paramhdr *ph;
5869
5870                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5871                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5872                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5873                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5874         }
5875         /* And now tell the peer we do all the extensions */
5876         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5877         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5878         num_ext = 0;
5879         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5880         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5881         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5882         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5883         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5884         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5885                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5886         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5887                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5888         p_len = sizeof(*pr_supported) + num_ext;
5889         pr_supported->ph.param_length = htons(p_len);
5890         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5891         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5892
5893         /* add authentication parameters */
5894         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5895                 struct sctp_auth_random *randp;
5896                 struct sctp_auth_hmac_algo *hmacs;
5897                 struct sctp_auth_chunk_list *chunks;
5898                 uint16_t random_len;
5899
5900                 /* generate and add RANDOM parameter */
5901                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5902                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5903                 randp->ph.param_type = htons(SCTP_RANDOM);
5904                 p_len = sizeof(*randp) + random_len;
5905                 randp->ph.param_length = htons(p_len);
5906                 SCTP_READ_RANDOM(randp->random_data, random_len);
5907                 /* zero out any padding required */
5908                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5909                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5910
5911                 /* add HMAC_ALGO parameter */
5912                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5913                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5914                     (uint8_t *) hmacs->hmac_ids);
5915                 if (p_len > 0) {
5916                         p_len += sizeof(*hmacs);
5917                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5918                         hmacs->ph.param_length = htons(p_len);
5919                         /* zero out any padding required */
5920                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5921                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5922                 }
5923                 /* add CHUNKS parameter */
5924                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5925                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5926                     chunks->chunk_types);
5927                 if (p_len > 0) {
5928                         p_len += sizeof(*chunks);
5929                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5930                         chunks->ph.param_length = htons(p_len);
5931                         /* zero out any padding required */
5932                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5933                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5934                 }
5935         }
5936         m_at = m;
5937         /* now the addresses */
5938         {
5939                 struct sctp_scoping scp;
5940
5941                 /*
5942                  * To optimize this we could put the scoping stuff into a
5943                  * structure and remove the individual uint8's from the stc
5944                  * structure. Then we could just sifa in the address within
5945                  * the stc.. but for now this is a quick hack to get the
5946                  * address stuff teased apart.
5947                  */
5948                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5949                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5950                 scp.loopback_scope = stc.loopback_scope;
5951                 scp.ipv4_local_scope = stc.ipv4_scope;
5952                 scp.local_scope = stc.local_scope;
5953                 scp.site_scope = stc.site_scope;
5954                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5955         }
5956
5957         /* tack on the operational error if present */
5958         if (op_err) {
5959                 struct mbuf *ol;
5960                 int llen;
5961
5962                 llen = 0;
5963                 ol = op_err;
5964
5965                 while (ol) {
5966                         llen += SCTP_BUF_LEN(ol);
5967                         ol = SCTP_BUF_NEXT(ol);
5968                 }
5969                 if (llen % 4) {
5970                         /* must add a pad to the param */
5971                         uint32_t cpthis = 0;
5972                         int padlen;
5973
5974                         padlen = 4 - (llen % 4);
5975                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5976                 }
5977                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5978                         m_at = SCTP_BUF_NEXT(m_at);
5979                 }
5980                 SCTP_BUF_NEXT(m_at) = op_err;
5981                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5982                         m_at = SCTP_BUF_NEXT(m_at);
5983                 }
5984         }
5985         /* pre-calulate the size and update pkt header and chunk header */
5986         p_len = 0;
5987         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5988                 p_len += SCTP_BUF_LEN(m_tmp);
5989                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5990                         /* m_tmp should now point to last one */
5991                         break;
5992                 }
5993         }
5994
5995         /* Now we must build a cookie */
5996         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5997         if (m_cookie == NULL) {
5998                 /* memory problem */
5999                 sctp_m_freem(m);
6000                 return;
6001         }
6002         /* Now append the cookie to the end and update the space/size */
6003         SCTP_BUF_NEXT(m_tmp) = m_cookie;
6004
6005         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6006                 p_len += SCTP_BUF_LEN(m_tmp);
6007                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6008                         /* m_tmp should now point to last one */
6009                         mp_last = m_tmp;
6010                         break;
6011                 }
6012         }
6013         /*
6014          * Place in the size, but we don't include the last pad (if any) in
6015          * the INIT-ACK.
6016          */
6017         initack->ch.chunk_length = htons(p_len);
6018
6019         /*
6020          * Time to sign the cookie, we don't sign over the cookie signature
6021          * though thus we set trailer.
6022          */
6023         (void)sctp_hmac_m(SCTP_HMAC,
6024             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6025             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6026             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6027         /*
6028          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6029          * here since the timer will drive a retranmission.
6030          */
6031         padval = p_len % 4;
6032         if ((padval) && (mp_last)) {
6033                 /* see my previous comments on mp_last */
6034                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
6035                         /* Houston we have a problem, no space */
6036                         sctp_m_freem(m);
6037                         return;
6038                 }
6039         }
6040         if (stc.loopback_scope) {
6041                 over_addr = &store1;
6042         } else {
6043                 over_addr = NULL;
6044         }
6045
6046         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6047             0, 0,
6048             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6049             port, SCTP_SO_NOT_LOCKED, over_addr, init_pkt);
6050         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6051 }
6052
6053
6054 static void
6055 sctp_prune_prsctp(struct sctp_tcb *stcb,
6056     struct sctp_association *asoc,
6057     struct sctp_sndrcvinfo *srcv,
6058     int dataout)
6059 {
6060         int freed_spc = 0;
6061         struct sctp_tmit_chunk *chk, *nchk;
6062
6063         SCTP_TCB_LOCK_ASSERT(stcb);
6064         if ((asoc->peer_supports_prsctp) &&
6065             (asoc->sent_queue_cnt_removeable > 0)) {
6066                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6067                         /*
6068                          * Look for chunks marked with the PR_SCTP flag AND
6069                          * the buffer space flag. If the one being sent is
6070                          * equal or greater priority then purge the old one
6071                          * and free some space.
6072                          */
6073                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6074                                 /*
6075                                  * This one is PR-SCTP AND buffer space
6076                                  * limited type
6077                                  */
6078                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6079                                         /*
6080                                          * Lower numbers equates to higher
6081                                          * priority so if the one we are
6082                                          * looking at has a larger or equal
6083                                          * priority we want to drop the data
6084                                          * and NOT retransmit it.
6085                                          */
6086                                         if (chk->data) {
6087                                                 /*
6088                                                  * We release the book_size
6089                                                  * if the mbuf is here
6090                                                  */
6091                                                 int ret_spc;
6092                                                 uint8_t sent;
6093
6094                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6095                                                         sent = 1;
6096                                                 else
6097                                                         sent = 0;
6098                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6099                                                     sent,
6100                                                     SCTP_SO_LOCKED);
6101                                                 freed_spc += ret_spc;
6102                                                 if (freed_spc >= dataout) {
6103                                                         return;
6104                                                 }
6105                                         }       /* if chunk was present */
6106                                 }       /* if of sufficent priority */
6107                         }       /* if chunk has enabled */
6108                 }               /* tailqforeach */
6109
6110                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6111                         /* Here we must move to the sent queue and mark */
6112                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6113                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6114                                         if (chk->data) {
6115                                                 /*
6116                                                  * We release the book_size
6117                                                  * if the mbuf is here
6118                                                  */
6119                                                 int ret_spc;
6120
6121                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6122                                                     0, SCTP_SO_LOCKED);
6123
6124                                                 freed_spc += ret_spc;
6125                                                 if (freed_spc >= dataout) {
6126                                                         return;
6127                                                 }
6128                                         }       /* end if chk->data */
6129                                 }       /* end if right class */
6130                         }       /* end if chk pr-sctp */
6131                 }               /* tailqforeachsafe (chk) */
6132         }                       /* if enabled in asoc */
6133 }
6134
6135 int
6136 sctp_get_frag_point(struct sctp_tcb *stcb,
6137     struct sctp_association *asoc)
6138 {
6139         int siz, ovh;
6140
6141         /*
6142          * For endpoints that have both v6 and v4 addresses we must reserve
6143          * room for the ipv6 header, for those that are only dealing with V4
6144          * we use a larger frag point.
6145          */
6146         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6147                 ovh = SCTP_MED_OVERHEAD;
6148         } else {
6149                 ovh = SCTP_MED_V4_OVERHEAD;
6150         }
6151
6152         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6153                 siz = asoc->smallest_mtu - ovh;
6154         else
6155                 siz = (stcb->asoc.sctp_frag_point - ovh);
6156         /*
6157          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6158          */
6159         /* A data chunk MUST fit in a cluster */
6160         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6161         /* } */
6162
6163         /* adjust for an AUTH chunk if DATA requires auth */
6164         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6165                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6166
6167         if (siz % 4) {
6168                 /* make it an even word boundary please */
6169                 siz -= (siz % 4);
6170         }
6171         return (siz);
6172 }
6173
6174 static void
6175 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6176 {
6177         sp->pr_sctp_on = 0;
6178         /*
6179          * We assume that the user wants PR_SCTP_TTL if the user provides a
6180          * positive lifetime but does not specify any PR_SCTP policy. This
6181          * is a BAD assumption and causes problems at least with the
6182          * U-Vancovers MPI folks. I will change this to be no policy means
6183          * NO PR-SCTP.
6184          */
6185         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6186                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6187                 sp->pr_sctp_on = 1;
6188         } else {
6189                 return;
6190         }
6191         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6192         case CHUNK_FLAGS_PR_SCTP_BUF:
6193                 /*
6194                  * Time to live is a priority stored in tv_sec when doing
6195                  * the buffer drop thing.
6196                  */
6197                 sp->ts.tv_sec = sp->timetolive;
6198                 sp->ts.tv_usec = 0;
6199                 break;
6200         case CHUNK_FLAGS_PR_SCTP_TTL:
6201                 {
6202                         struct timeval tv;
6203
6204                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6205                         tv.tv_sec = sp->timetolive / 1000;
6206                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6207                         /*
6208                          * TODO sctp_constants.h needs alternative time
6209                          * macros when _KERNEL is undefined.
6210                          */
6211                         timevaladd(&sp->ts, &tv);
6212                 }
6213                 break;
6214         case CHUNK_FLAGS_PR_SCTP_RTX:
6215                 /*
6216                  * Time to live is a the number or retransmissions stored in
6217                  * tv_sec.
6218                  */
6219                 sp->ts.tv_sec = sp->timetolive;
6220                 sp->ts.tv_usec = 0;
6221                 break;
6222         default:
6223                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6224                     "Unknown PR_SCTP policy %u.\n",
6225                     PR_SCTP_POLICY(sp->sinfo_flags));
6226                 break;
6227         }
6228 }
6229
6230 static int
6231 sctp_msg_append(struct sctp_tcb *stcb,
6232     struct sctp_nets *net,
6233     struct mbuf *m,
6234     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6235 {
6236         int error = 0;
6237         struct mbuf *at;
6238         struct sctp_stream_queue_pending *sp = NULL;
6239         struct sctp_stream_out *strm;
6240
6241         /*
6242          * Given an mbuf chain, put it into the association send queue and
6243          * place it on the wheel
6244          */
6245         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6246                 /* Invalid stream number */
6247                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6248                 error = EINVAL;
6249                 goto out_now;
6250         }
6251         if ((stcb->asoc.stream_locked) &&
6252             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6253                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6254                 error = EINVAL;
6255                 goto out_now;
6256         }
6257         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6258         /* Now can we send this? */
6259         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6260             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6261             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6262             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6263                 /* got data while shutting down */
6264                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6265                 error = ECONNRESET;
6266                 goto out_now;
6267         }
6268         sctp_alloc_a_strmoq(stcb, sp);
6269         if (sp == NULL) {
6270                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6271                 error = ENOMEM;
6272                 goto out_now;
6273         }
6274         sp->sinfo_flags = srcv->sinfo_flags;
6275         sp->timetolive = srcv->sinfo_timetolive;
6276         sp->ppid = srcv->sinfo_ppid;
6277         sp->context = srcv->sinfo_context;
6278         sp->strseq = 0;
6279         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6280                 sp->net = net;
6281                 atomic_add_int(&sp->net->ref_count, 1);
6282         } else {
6283                 sp->net = NULL;
6284         }
6285         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6286         sp->stream = srcv->sinfo_stream;
6287         sp->msg_is_complete = 1;
6288         sp->sender_all_done = 1;
6289         sp->some_taken = 0;
6290         sp->data = m;
6291         sp->tail_mbuf = NULL;
6292         sctp_set_prsctp_policy(sp);
6293         /*
6294          * We could in theory (for sendall) sifa the length in, but we would
6295          * still have to hunt through the chain since we need to setup the
6296          * tail_mbuf
6297          */
6298         sp->length = 0;
6299         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6300                 if (SCTP_BUF_NEXT(at) == NULL)
6301                         sp->tail_mbuf = at;
6302                 sp->length += SCTP_BUF_LEN(at);
6303         }
6304         if (srcv->sinfo_keynumber_valid) {
6305                 sp->auth_keyid = srcv->sinfo_keynumber;
6306         } else {
6307                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6308         }
6309         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6310                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6311                 sp->holds_key_ref = 1;
6312         }
6313         if (hold_stcb_lock == 0) {
6314                 SCTP_TCB_SEND_LOCK(stcb);
6315         }
6316         sctp_snd_sb_alloc(stcb, sp->length);
6317         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6318         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6319         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6320                 sp->strseq = strm->next_sequence_sent;
6321                 strm->next_sequence_sent++;
6322         }
6323         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6324         m = NULL;
6325         if (hold_stcb_lock == 0) {
6326                 SCTP_TCB_SEND_UNLOCK(stcb);
6327         }
6328 out_now:
6329         if (m) {
6330                 sctp_m_freem(m);
6331         }
6332         return (error);
6333 }
6334
6335
6336 static struct mbuf *
6337 sctp_copy_mbufchain(struct mbuf *clonechain,
6338     struct mbuf *outchain,
6339     struct mbuf **endofchain,
6340     int can_take_mbuf,
6341     int sizeofcpy,
6342     uint8_t copy_by_ref)
6343 {
6344         struct mbuf *m;
6345         struct mbuf *appendchain;
6346         caddr_t cp;
6347         int len;
6348
6349         if (endofchain == NULL) {
6350                 /* error */
6351 error_out:
6352                 if (outchain)
6353                         sctp_m_freem(outchain);
6354                 return (NULL);
6355         }
6356         if (can_take_mbuf) {
6357                 appendchain = clonechain;
6358         } else {
6359                 if (!copy_by_ref &&
6360                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6361                     ) {
6362                         /* Its not in a cluster */
6363                         if (*endofchain == NULL) {
6364                                 /* lets get a mbuf cluster */
6365                                 if (outchain == NULL) {
6366                                         /* This is the general case */
6367                         new_mbuf:
6368                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6369                                         if (outchain == NULL) {
6370                                                 goto error_out;
6371                                         }
6372                                         SCTP_BUF_LEN(outchain) = 0;
6373                                         *endofchain = outchain;
6374                                         /* get the prepend space */
6375                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6376                                 } else {
6377                                         /*
6378                                          * We really should not get a NULL
6379                                          * in endofchain
6380                                          */
6381                                         /* find end */
6382                                         m = outchain;
6383                                         while (m) {
6384                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6385                                                         *endofchain = m;
6386                                                         break;
6387                                                 }
6388                                                 m = SCTP_BUF_NEXT(m);
6389                                         }
6390                                         /* sanity */
6391                                         if (*endofchain == NULL) {
6392                                                 /*
6393                                                  * huh, TSNH XXX maybe we
6394                                                  * should panic
6395                                                  */
6396                                                 sctp_m_freem(outchain);
6397                                                 goto new_mbuf;
6398                                         }
6399                                 }
6400                                 /* get the new end of length */
6401                                 len = M_TRAILINGSPACE(*endofchain);
6402                         } else {
6403                                 /* how much is left at the end? */
6404                                 len = M_TRAILINGSPACE(*endofchain);
6405                         }
6406                         /* Find the end of the data, for appending */
6407                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6408
6409                         /* Now lets copy it out */
6410                         if (len >= sizeofcpy) {
6411                                 /* It all fits, copy it in */
6412                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6413                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6414                         } else {
6415                                 /* fill up the end of the chain */
6416                                 if (len > 0) {
6417                                         m_copydata(clonechain, 0, len, cp);
6418                                         SCTP_BUF_LEN((*endofchain)) += len;
6419                                         /* now we need another one */
6420                                         sizeofcpy -= len;
6421                                 }
6422                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6423                                 if (m == NULL) {
6424                                         /* We failed */
6425                                         goto error_out;
6426                                 }
6427                                 SCTP_BUF_NEXT((*endofchain)) = m;
6428                                 *endofchain = m;
6429                                 cp = mtod((*endofchain), caddr_t);
6430                                 m_copydata(clonechain, len, sizeofcpy, cp);
6431                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6432                         }
6433                         return (outchain);
6434                 } else {
6435                         /* copy the old fashion way */
6436                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6437 #ifdef SCTP_MBUF_LOGGING
6438                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6439                                 struct mbuf *mat;
6440
6441                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6442                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6443                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6444                                         }
6445                                 }
6446                         }
6447 #endif
6448                 }
6449         }
6450         if (appendchain == NULL) {
6451                 /* error */
6452                 if (outchain)
6453                         sctp_m_freem(outchain);
6454                 return (NULL);
6455         }
6456         if (outchain) {
6457                 /* tack on to the end */
6458                 if (*endofchain != NULL) {
6459                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6460                 } else {
6461                         m = outchain;
6462                         while (m) {
6463                                 if (SCTP_BUF_NEXT(m) == NULL) {
6464                                         SCTP_BUF_NEXT(m) = appendchain;
6465                                         break;
6466                                 }
6467                                 m = SCTP_BUF_NEXT(m);
6468                         }
6469                 }
6470                 /*
6471                  * save off the end and update the end-chain postion
6472                  */
6473                 m = appendchain;
6474                 while (m) {
6475                         if (SCTP_BUF_NEXT(m) == NULL) {
6476                                 *endofchain = m;
6477                                 break;
6478                         }
6479                         m = SCTP_BUF_NEXT(m);
6480                 }
6481                 return (outchain);
6482         } else {
6483                 /* save off the end and update the end-chain postion */
6484                 m = appendchain;
6485                 while (m) {
6486                         if (SCTP_BUF_NEXT(m) == NULL) {
6487                                 *endofchain = m;
6488                                 break;
6489                         }
6490                         m = SCTP_BUF_NEXT(m);
6491                 }
6492                 return (appendchain);
6493         }
6494 }
6495
6496 int
6497 sctp_med_chunk_output(struct sctp_inpcb *inp,
6498     struct sctp_tcb *stcb,
6499     struct sctp_association *asoc,
6500     int *num_out,
6501     int *reason_code,
6502     int control_only, int from_where,
6503     struct timeval *now, int *now_filled, int frag_point, int so_locked
6504 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6505     SCTP_UNUSED
6506 #endif
6507 );
6508
6509 static void
6510 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6511     uint32_t val SCTP_UNUSED)
6512 {
6513         struct sctp_copy_all *ca;
6514         struct mbuf *m;
6515         int ret = 0;
6516         int added_control = 0;
6517         int un_sent, do_chunk_output = 1;
6518         struct sctp_association *asoc;
6519         struct sctp_nets *net;
6520
6521         ca = (struct sctp_copy_all *)ptr;
6522         if (ca->m == NULL) {
6523                 return;
6524         }
6525         if (ca->inp != inp) {
6526                 /* TSNH */
6527                 return;
6528         }
6529         if ((ca->m) && ca->sndlen) {
6530                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6531                 if (m == NULL) {
6532                         /* can't copy so we are done */
6533                         ca->cnt_failed++;
6534                         return;
6535                 }
6536 #ifdef SCTP_MBUF_LOGGING
6537                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6538                         struct mbuf *mat;
6539
6540                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6541                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6542                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6543                                 }
6544                         }
6545                 }
6546 #endif
6547         } else {
6548                 m = NULL;
6549         }
6550         SCTP_TCB_LOCK_ASSERT(stcb);
6551         if (stcb->asoc.alternate) {
6552                 net = stcb->asoc.alternate;
6553         } else {
6554                 net = stcb->asoc.primary_destination;
6555         }
6556         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6557                 /* Abort this assoc with m as the user defined reason */
6558                 if (m) {
6559                         struct sctp_paramhdr *ph;
6560
6561                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6562                         if (m) {
6563                                 ph = mtod(m, struct sctp_paramhdr *);
6564                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6565                                 ph->param_length = htons(ca->sndlen);
6566                         }
6567                         /*
6568                          * We add one here to keep the assoc from
6569                          * dis-appearing on us.
6570                          */
6571                         atomic_add_int(&stcb->asoc.refcnt, 1);
6572                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6573                         /*
6574                          * sctp_abort_an_association calls sctp_free_asoc()
6575                          * free association will NOT free it since we
6576                          * incremented the refcnt .. we do this to prevent
6577                          * it being freed and things getting tricky since we
6578                          * could end up (from free_asoc) calling inpcb_free
6579                          * which would get a recursive lock call to the
6580                          * iterator lock.. But as a consequence of that the
6581                          * stcb will return to us un-locked.. since
6582                          * free_asoc returns with either no TCB or the TCB
6583                          * unlocked, we must relock.. to unlock in the
6584                          * iterator timer :-0
6585                          */
6586                         SCTP_TCB_LOCK(stcb);
6587                         atomic_add_int(&stcb->asoc.refcnt, -1);
6588                         goto no_chunk_output;
6589                 }
6590         } else {
6591                 if (m) {
6592                         ret = sctp_msg_append(stcb, net, m,
6593                             &ca->sndrcv, 1);
6594                 }
6595                 asoc = &stcb->asoc;
6596                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6597                         /* shutdown this assoc */
6598                         int cnt;
6599
6600                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6601
6602                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6603                             TAILQ_EMPTY(&asoc->sent_queue) &&
6604                             (cnt == 0)) {
6605                                 if (asoc->locked_on_sending) {
6606                                         goto abort_anyway;
6607                                 }
6608                                 /*
6609                                  * there is nothing queued to send, so I'm
6610                                  * done...
6611                                  */
6612                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6613                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6614                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6615                                         /*
6616                                          * only send SHUTDOWN the first time
6617                                          * through
6618                                          */
6619                                         sctp_send_shutdown(stcb, net);
6620                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6621                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6622                                         }
6623                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6624                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6625                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6626                                             net);
6627                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6628                                             asoc->primary_destination);
6629                                         added_control = 1;
6630                                         do_chunk_output = 0;
6631                                 }
6632                         } else {
6633                                 /*
6634                                  * we still got (or just got) data to send,
6635                                  * so set SHUTDOWN_PENDING
6636                                  */
6637                                 /*
6638                                  * XXX sockets draft says that SCTP_EOF
6639                                  * should be sent with no data.  currently,
6640                                  * we will allow user data to be sent first
6641                                  * and move to SHUTDOWN-PENDING
6642                                  */
6643                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6644                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6645                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6646                                         if (asoc->locked_on_sending) {
6647                                                 /*
6648                                                  * Locked to send out the
6649                                                  * data
6650                                                  */
6651                                                 struct sctp_stream_queue_pending *sp;
6652
6653                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6654                                                 if (sp) {
6655                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6656                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6657                                                 }
6658                                         }
6659                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6660                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6661                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6662                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6663                                 abort_anyway:
6664                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6665                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6666                                                     NULL, SCTP_SO_NOT_LOCKED);
6667                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6668                                                 goto no_chunk_output;
6669                                         }
6670                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6671                                             asoc->primary_destination);
6672                                 }
6673                         }
6674
6675                 }
6676         }
6677         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6678             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6679
6680         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6681             (stcb->asoc.total_flight > 0) &&
6682             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6683             ) {
6684                 do_chunk_output = 0;
6685         }
6686         if (do_chunk_output)
6687                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6688         else if (added_control) {
6689                 int num_out = 0, reason = 0, now_filled = 0;
6690                 struct timeval now;
6691                 int frag_point;
6692
6693                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6694                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6695                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6696         }
6697 no_chunk_output:
6698         if (ret) {
6699                 ca->cnt_failed++;
6700         } else {
6701                 ca->cnt_sent++;
6702         }
6703 }
6704
6705 static void
6706 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6707 {
6708         struct sctp_copy_all *ca;
6709
6710         ca = (struct sctp_copy_all *)ptr;
6711         /*
6712          * Do a notify here? Kacheong suggests that the notify be done at
6713          * the send time.. so you would push up a notification if any send
6714          * failed. Don't know if this is feasable since the only failures we
6715          * have is "memory" related and if you cannot get an mbuf to send
6716          * the data you surely can't get an mbuf to send up to notify the
6717          * user you can't send the data :->
6718          */
6719
6720         /* now free everything */
6721         sctp_m_freem(ca->m);
6722         SCTP_FREE(ca, SCTP_M_COPYAL);
6723 }
6724
6725
6726 #define MC_ALIGN(m, len) do {                                           \
6727         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6728 } while (0)
6729
6730
6731
6732 static struct mbuf *
6733 sctp_copy_out_all(struct uio *uio, int len)
6734 {
6735         struct mbuf *ret, *at;
6736         int left, willcpy, cancpy, error;
6737
6738         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6739         if (ret == NULL) {
6740                 /* TSNH */
6741                 return (NULL);
6742         }
6743         left = len;
6744         SCTP_BUF_LEN(ret) = 0;
6745         /* save space for the data chunk header */
6746         cancpy = M_TRAILINGSPACE(ret);
6747         willcpy = min(cancpy, left);
6748         at = ret;
6749         while (left > 0) {
6750                 /* Align data to the end */
6751                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6752                 if (error) {
6753         err_out_now:
6754                         sctp_m_freem(at);
6755                         return (NULL);
6756                 }
6757                 SCTP_BUF_LEN(at) = willcpy;
6758                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6759                 left -= willcpy;
6760                 if (left > 0) {
6761                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6762                         if (SCTP_BUF_NEXT(at) == NULL) {
6763                                 goto err_out_now;
6764                         }
6765                         at = SCTP_BUF_NEXT(at);
6766                         SCTP_BUF_LEN(at) = 0;
6767                         cancpy = M_TRAILINGSPACE(at);
6768                         willcpy = min(cancpy, left);
6769                 }
6770         }
6771         return (ret);
6772 }
6773
6774 static int
6775 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6776     struct sctp_sndrcvinfo *srcv)
6777 {
6778         int ret;
6779         struct sctp_copy_all *ca;
6780
6781         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6782             SCTP_M_COPYAL);
6783         if (ca == NULL) {
6784                 sctp_m_freem(m);
6785                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6786                 return (ENOMEM);
6787         }
6788         memset(ca, 0, sizeof(struct sctp_copy_all));
6789
6790         ca->inp = inp;
6791         if (srcv) {
6792                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6793         }
6794         /*
6795          * take off the sendall flag, it would be bad if we failed to do
6796          * this :-0
6797          */
6798         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6799         /* get length and mbuf chain */
6800         if (uio) {
6801                 ca->sndlen = uio->uio_resid;
6802                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6803                 if (ca->m == NULL) {
6804                         SCTP_FREE(ca, SCTP_M_COPYAL);
6805                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6806                         return (ENOMEM);
6807                 }
6808         } else {
6809                 /* Gather the length of the send */
6810                 struct mbuf *mat;
6811
6812                 mat = m;
6813                 ca->sndlen = 0;
6814                 while (m) {
6815                         ca->sndlen += SCTP_BUF_LEN(m);
6816                         m = SCTP_BUF_NEXT(m);
6817                 }
6818                 ca->m = mat;
6819         }
6820         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6821             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6822             SCTP_ASOC_ANY_STATE,
6823             (void *)ca, 0,
6824             sctp_sendall_completes, inp, 1);
6825         if (ret) {
6826                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6827                 SCTP_FREE(ca, SCTP_M_COPYAL);
6828                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6829                 return (EFAULT);
6830         }
6831         return (0);
6832 }
6833
6834
6835 void
6836 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6837 {
6838         struct sctp_tmit_chunk *chk, *nchk;
6839
6840         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6841                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6842                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6843                         if (chk->data) {
6844                                 sctp_m_freem(chk->data);
6845                                 chk->data = NULL;
6846                         }
6847                         asoc->ctrl_queue_cnt--;
6848                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6849                 }
6850         }
6851 }
6852
6853 void
6854 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6855 {
6856         struct sctp_association *asoc;
6857         struct sctp_tmit_chunk *chk, *nchk;
6858         struct sctp_asconf_chunk *acp;
6859
6860         asoc = &stcb->asoc;
6861         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6862                 /* find SCTP_ASCONF chunk in queue */
6863                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6864                         if (chk->data) {
6865                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6866                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6867                                         /* Not Acked yet */
6868                                         break;
6869                                 }
6870                         }
6871                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6872                         if (chk->data) {
6873                                 sctp_m_freem(chk->data);
6874                                 chk->data = NULL;
6875                         }
6876                         asoc->ctrl_queue_cnt--;
6877                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6878                 }
6879         }
6880 }
6881
6882
6883 static void
6884 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6885     struct sctp_association *asoc,
6886     struct sctp_tmit_chunk **data_list,
6887     int bundle_at,
6888     struct sctp_nets *net)
6889 {
6890         int i;
6891         struct sctp_tmit_chunk *tp1;
6892
6893         for (i = 0; i < bundle_at; i++) {
6894                 /* off of the send queue */
6895                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6896                 asoc->send_queue_cnt--;
6897                 if (i > 0) {
6898                         /*
6899                          * Any chunk NOT 0 you zap the time chunk 0 gets
6900                          * zapped or set based on if a RTO measurment is
6901                          * needed.
6902                          */
6903                         data_list[i]->do_rtt = 0;
6904                 }
6905                 /* record time */
6906                 data_list[i]->sent_rcv_time = net->last_sent_time;
6907                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6908                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6909                 if (data_list[i]->whoTo == NULL) {
6910                         data_list[i]->whoTo = net;
6911                         atomic_add_int(&net->ref_count, 1);
6912                 }
6913                 /* on to the sent queue */
6914                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6915                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6916                         struct sctp_tmit_chunk *tpp;
6917
6918                         /* need to move back */
6919         back_up_more:
6920                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6921                         if (tpp == NULL) {
6922                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6923                                 goto all_done;
6924                         }
6925                         tp1 = tpp;
6926                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6927                                 goto back_up_more;
6928                         }
6929                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6930                 } else {
6931                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6932                             data_list[i],
6933                             sctp_next);
6934                 }
6935 all_done:
6936                 /* This does not lower until the cum-ack passes it */
6937                 asoc->sent_queue_cnt++;
6938                 if ((asoc->peers_rwnd <= 0) &&
6939                     (asoc->total_flight == 0) &&
6940                     (bundle_at == 1)) {
6941                         /* Mark the chunk as being a window probe */
6942                         SCTP_STAT_INCR(sctps_windowprobed);
6943                 }
6944 #ifdef SCTP_AUDITING_ENABLED
6945                 sctp_audit_log(0xC2, 3);
6946 #endif
6947                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6948                 data_list[i]->snd_count = 1;
6949                 data_list[i]->rec.data.chunk_was_revoked = 0;
6950                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6951                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6952                             data_list[i]->whoTo->flight_size,
6953                             data_list[i]->book_size,
6954                             (uintptr_t) data_list[i]->whoTo,
6955                             data_list[i]->rec.data.TSN_seq);
6956                 }
6957                 sctp_flight_size_increase(data_list[i]);
6958                 sctp_total_flight_increase(stcb, data_list[i]);
6959                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6960                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6961                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6962                 }
6963                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6964                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6965                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6966                         /* SWS sender side engages */
6967                         asoc->peers_rwnd = 0;
6968                 }
6969         }
6970         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6971                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6972         }
6973 }
6974
6975 static void
6976 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6977 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6978     SCTP_UNUSED
6979 #endif
6980 )
6981 {
6982         struct sctp_tmit_chunk *chk, *nchk;
6983
6984         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6985                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6986                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6987                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6988                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6989                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6990                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6991                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6992                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6993                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6994                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6995                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6996                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6997                         /* Stray chunks must be cleaned up */
6998         clean_up_anyway:
6999                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7000                         if (chk->data) {
7001                                 sctp_m_freem(chk->data);
7002                                 chk->data = NULL;
7003                         }
7004                         asoc->ctrl_queue_cnt--;
7005                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7006                                 asoc->fwd_tsn_cnt--;
7007                         sctp_free_a_chunk(stcb, chk, so_locked);
7008                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7009                         /* special handling, we must look into the param */
7010                         if (chk != asoc->str_reset) {
7011                                 goto clean_up_anyway;
7012                         }
7013                 }
7014         }
7015 }
7016
7017
7018 static int
7019 sctp_can_we_split_this(struct sctp_tcb *stcb,
7020     uint32_t length,
7021     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7022 {
7023         /*
7024          * Make a decision on if I should split a msg into multiple parts.
7025          * This is only asked of incomplete messages.
7026          */
7027         if (eeor_on) {
7028                 /*
7029                  * If we are doing EEOR we need to always send it if its the
7030                  * entire thing, since it might be all the guy is putting in
7031                  * the hopper.
7032                  */
7033                 if (goal_mtu >= length) {
7034                         /*-
7035                          * If we have data outstanding,
7036                          * we get another chance when the sack
7037                          * arrives to transmit - wait for more data
7038                          */
7039                         if (stcb->asoc.total_flight == 0) {
7040                                 /*
7041                                  * If nothing is in flight, we zero the
7042                                  * packet counter.
7043                                  */
7044                                 return (length);
7045                         }
7046                         return (0);
7047
7048                 } else {
7049                         /* You can fill the rest */
7050                         return (goal_mtu);
7051                 }
7052         }
7053         /*-
7054          * For those strange folk that make the send buffer
7055          * smaller than our fragmentation point, we can't
7056          * get a full msg in so we have to allow splitting.
7057          */
7058         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7059                 return (length);
7060         }
7061         if ((length <= goal_mtu) ||
7062             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7063                 /* Sub-optimial residual don't split in non-eeor mode. */
7064                 return (0);
7065         }
7066         /*
7067          * If we reach here length is larger than the goal_mtu. Do we wish
7068          * to split it for the sake of packet putting together?
7069          */
7070         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7071                 /* Its ok to split it */
7072                 return (min(goal_mtu, frag_point));
7073         }
7074         /* Nope, can't split */
7075         return (0);
7076
7077 }
7078
7079 static uint32_t
7080 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7081     struct sctp_stream_out *strq,
7082     uint32_t goal_mtu,
7083     uint32_t frag_point,
7084     int *locked,
7085     int *giveup,
7086     int eeor_mode,
7087     int *bail,
7088     int so_locked
7089 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7090     SCTP_UNUSED
7091 #endif
7092 )
7093 {
7094         /* Move from the stream to the send_queue keeping track of the total */
7095         struct sctp_association *asoc;
7096         struct sctp_stream_queue_pending *sp;
7097         struct sctp_tmit_chunk *chk;
7098         struct sctp_data_chunk *dchkh;
7099         uint32_t to_move, length;
7100         uint8_t rcv_flags = 0;
7101         uint8_t some_taken;
7102         uint8_t send_lock_up = 0;
7103
7104         SCTP_TCB_LOCK_ASSERT(stcb);
7105         asoc = &stcb->asoc;
7106 one_more_time:
7107         /* sa_ignore FREED_MEMORY */
7108         sp = TAILQ_FIRST(&strq->outqueue);
7109         if (sp == NULL) {
7110                 *locked = 0;
7111                 if (send_lock_up == 0) {
7112                         SCTP_TCB_SEND_LOCK(stcb);
7113                         send_lock_up = 1;
7114                 }
7115                 sp = TAILQ_FIRST(&strq->outqueue);
7116                 if (sp) {
7117                         goto one_more_time;
7118                 }
7119                 if (strq->last_msg_incomplete) {
7120                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7121                             strq->stream_no,
7122                             strq->last_msg_incomplete);
7123                         strq->last_msg_incomplete = 0;
7124                 }
7125                 to_move = 0;
7126                 if (send_lock_up) {
7127                         SCTP_TCB_SEND_UNLOCK(stcb);
7128                         send_lock_up = 0;
7129                 }
7130                 goto out_of;
7131         }
7132         if ((sp->msg_is_complete) && (sp->length == 0)) {
7133                 if (sp->sender_all_done) {
7134                         /*
7135                          * We are doing differed cleanup. Last time through
7136                          * when we took all the data the sender_all_done was
7137                          * not set.
7138                          */
7139                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7140                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7141                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7142                                     sp->sender_all_done,
7143                                     sp->length,
7144                                     sp->msg_is_complete,
7145                                     sp->put_last_out,
7146                                     send_lock_up);
7147                         }
7148                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7149                                 SCTP_TCB_SEND_LOCK(stcb);
7150                                 send_lock_up = 1;
7151                         }
7152                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7153                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7154                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7155                         if (sp->net) {
7156                                 sctp_free_remote_addr(sp->net);
7157                                 sp->net = NULL;
7158                         }
7159                         if (sp->data) {
7160                                 sctp_m_freem(sp->data);
7161                                 sp->data = NULL;
7162                         }
7163                         sctp_free_a_strmoq(stcb, sp, so_locked);
7164                         /* we can't be locked to it */
7165                         *locked = 0;
7166                         stcb->asoc.locked_on_sending = NULL;
7167                         if (send_lock_up) {
7168                                 SCTP_TCB_SEND_UNLOCK(stcb);
7169                                 send_lock_up = 0;
7170                         }
7171                         /* back to get the next msg */
7172                         goto one_more_time;
7173                 } else {
7174                         /*
7175                          * sender just finished this but still holds a
7176                          * reference
7177                          */
7178                         *locked = 1;
7179                         *giveup = 1;
7180                         to_move = 0;
7181                         goto out_of;
7182                 }
7183         } else {
7184                 /* is there some to get */
7185                 if (sp->length == 0) {
7186                         /* no */
7187                         *locked = 1;
7188                         *giveup = 1;
7189                         to_move = 0;
7190                         goto out_of;
7191                 } else if (sp->discard_rest) {
7192                         if (send_lock_up == 0) {
7193                                 SCTP_TCB_SEND_LOCK(stcb);
7194                                 send_lock_up = 1;
7195                         }
7196                         /* Whack down the size */
7197                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7198                         if ((stcb->sctp_socket != NULL) && \
7199                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7200                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7201                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7202                         }
7203                         if (sp->data) {
7204                                 sctp_m_freem(sp->data);
7205                                 sp->data = NULL;
7206                                 sp->tail_mbuf = NULL;
7207                         }
7208                         sp->length = 0;
7209                         sp->some_taken = 1;
7210                         *locked = 1;
7211                         *giveup = 1;
7212                         to_move = 0;
7213                         goto out_of;
7214                 }
7215         }
7216         some_taken = sp->some_taken;
7217         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7218                 sp->msg_is_complete = 1;
7219         }
7220 re_look:
7221         length = sp->length;
7222         if (sp->msg_is_complete) {
7223                 /* The message is complete */
7224                 to_move = min(length, frag_point);
7225                 if (to_move == length) {
7226                         /* All of it fits in the MTU */
7227                         if (sp->some_taken) {
7228                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7229                                 sp->put_last_out = 1;
7230                         } else {
7231                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7232                                 sp->put_last_out = 1;
7233                         }
7234                 } else {
7235                         /* Not all of it fits, we fragment */
7236                         if (sp->some_taken == 0) {
7237                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7238                         }
7239                         sp->some_taken = 1;
7240                 }
7241         } else {
7242                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7243                 if (to_move) {
7244                         /*-
7245                          * We use a snapshot of length in case it
7246                          * is expanding during the compare.
7247                          */
7248                         uint32_t llen;
7249
7250                         llen = length;
7251                         if (to_move >= llen) {
7252                                 to_move = llen;
7253                                 if (send_lock_up == 0) {
7254                                         /*-
7255                                          * We are taking all of an incomplete msg
7256                                          * thus we need a send lock.
7257                                          */
7258                                         SCTP_TCB_SEND_LOCK(stcb);
7259                                         send_lock_up = 1;
7260                                         if (sp->msg_is_complete) {
7261                                                 /*
7262                                                  * the sender finished the
7263                                                  * msg
7264                                                  */
7265                                                 goto re_look;
7266                                         }
7267                                 }
7268                         }
7269                         if (sp->some_taken == 0) {
7270                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7271                                 sp->some_taken = 1;
7272                         }
7273                 } else {
7274                         /* Nothing to take. */
7275                         if (sp->some_taken) {
7276                                 *locked = 1;
7277                         }
7278                         *giveup = 1;
7279                         to_move = 0;
7280                         goto out_of;
7281                 }
7282         }
7283
7284         /* If we reach here, we can copy out a chunk */
7285         sctp_alloc_a_chunk(stcb, chk);
7286         if (chk == NULL) {
7287                 /* No chunk memory */
7288                 *giveup = 1;
7289                 to_move = 0;
7290                 goto out_of;
7291         }
7292         /*
7293          * Setup for unordered if needed by looking at the user sent info
7294          * flags.
7295          */
7296         if (sp->sinfo_flags & SCTP_UNORDERED) {
7297                 rcv_flags |= SCTP_DATA_UNORDERED;
7298         }
7299         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7300             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7301                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7302         }
7303         /* clear out the chunk before setting up */
7304         memset(chk, 0, sizeof(*chk));
7305         chk->rec.data.rcv_flags = rcv_flags;
7306
7307         if (to_move >= length) {
7308                 /* we think we can steal the whole thing */
7309                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7310                         SCTP_TCB_SEND_LOCK(stcb);
7311                         send_lock_up = 1;
7312                 }
7313                 if (to_move < sp->length) {
7314                         /* bail, it changed */
7315                         goto dont_do_it;
7316                 }
7317                 chk->data = sp->data;
7318                 chk->last_mbuf = sp->tail_mbuf;
7319                 /* register the stealing */
7320                 sp->data = sp->tail_mbuf = NULL;
7321         } else {
7322                 struct mbuf *m;
7323
7324 dont_do_it:
7325                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7326                 chk->last_mbuf = NULL;
7327                 if (chk->data == NULL) {
7328                         sp->some_taken = some_taken;
7329                         sctp_free_a_chunk(stcb, chk, so_locked);
7330                         *bail = 1;
7331                         to_move = 0;
7332                         goto out_of;
7333                 }
7334 #ifdef SCTP_MBUF_LOGGING
7335                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7336                         struct mbuf *mat;
7337
7338                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7339                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7340                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7341                                 }
7342                         }
7343                 }
7344 #endif
7345                 /* Pull off the data */
7346                 m_adj(sp->data, to_move);
7347                 /* Now lets work our way down and compact it */
7348                 m = sp->data;
7349                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7350                         sp->data = SCTP_BUF_NEXT(m);
7351                         SCTP_BUF_NEXT(m) = NULL;
7352                         if (sp->tail_mbuf == m) {
7353                                 /*-
7354                                  * Freeing tail? TSNH since
7355                                  * we supposedly were taking less
7356                                  * than the sp->length.
7357                                  */
7358 #ifdef INVARIANTS
7359                                 panic("Huh, freing tail? - TSNH");
7360 #else
7361                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7362                                 sp->tail_mbuf = sp->data = NULL;
7363                                 sp->length = 0;
7364 #endif
7365
7366                         }
7367                         sctp_m_free(m);
7368                         m = sp->data;
7369                 }
7370         }
7371         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7372                 chk->copy_by_ref = 1;
7373         } else {
7374                 chk->copy_by_ref = 0;
7375         }
7376         /*
7377          * get last_mbuf and counts of mb useage This is ugly but hopefully
7378          * its only one mbuf.
7379          */
7380         if (chk->last_mbuf == NULL) {
7381                 chk->last_mbuf = chk->data;
7382                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7383                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7384                 }
7385         }
7386         if (to_move > length) {
7387                 /*- This should not happen either
7388                  * since we always lower to_move to the size
7389                  * of sp->length if its larger.
7390                  */
7391 #ifdef INVARIANTS
7392                 panic("Huh, how can to_move be larger?");
7393 #else
7394                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7395                 sp->length = 0;
7396 #endif
7397         } else {
7398                 atomic_subtract_int(&sp->length, to_move);
7399         }
7400         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7401                 /* Not enough room for a chunk header, get some */
7402                 struct mbuf *m;
7403
7404                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7405                 if (m == NULL) {
7406                         /*
7407                          * we're in trouble here. _PREPEND below will free
7408                          * all the data if there is no leading space, so we
7409                          * must put the data back and restore.
7410                          */
7411                         if (send_lock_up == 0) {
7412                                 SCTP_TCB_SEND_LOCK(stcb);
7413                                 send_lock_up = 1;
7414                         }
7415                         if (chk->data == NULL) {
7416                                 /* unsteal the data */
7417                                 sp->data = chk->data;
7418                                 sp->tail_mbuf = chk->last_mbuf;
7419                         } else {
7420                                 struct mbuf *m_tmp;
7421
7422                                 /* reassemble the data */
7423                                 m_tmp = sp->data;
7424                                 sp->data = chk->data;
7425                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7426                         }
7427                         sp->some_taken = some_taken;
7428                         atomic_add_int(&sp->length, to_move);
7429                         chk->data = NULL;
7430                         *bail = 1;
7431                         sctp_free_a_chunk(stcb, chk, so_locked);
7432                         to_move = 0;
7433                         goto out_of;
7434                 } else {
7435                         SCTP_BUF_LEN(m) = 0;
7436                         SCTP_BUF_NEXT(m) = chk->data;
7437                         chk->data = m;
7438                         M_ALIGN(chk->data, 4);
7439                 }
7440         }
7441         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7442         if (chk->data == NULL) {
7443                 /* HELP, TSNH since we assured it would not above? */
7444 #ifdef INVARIANTS
7445                 panic("prepend failes HELP?");
7446 #else
7447                 SCTP_PRINTF("prepend fails HELP?\n");
7448                 sctp_free_a_chunk(stcb, chk, so_locked);
7449 #endif
7450                 *bail = 1;
7451                 to_move = 0;
7452                 goto out_of;
7453         }
7454         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7455         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7456         chk->book_size_scale = 0;
7457         chk->sent = SCTP_DATAGRAM_UNSENT;
7458
7459         chk->flags = 0;
7460         chk->asoc = &stcb->asoc;
7461         chk->pad_inplace = 0;
7462         chk->no_fr_allowed = 0;
7463         chk->rec.data.stream_seq = sp->strseq;
7464         chk->rec.data.stream_number = sp->stream;
7465         chk->rec.data.payloadtype = sp->ppid;
7466         chk->rec.data.context = sp->context;
7467         chk->rec.data.doing_fast_retransmit = 0;
7468
7469         chk->rec.data.timetodrop = sp->ts;
7470         chk->flags = sp->act_flags;
7471
7472         if (sp->net) {
7473                 chk->whoTo = sp->net;
7474                 atomic_add_int(&chk->whoTo->ref_count, 1);
7475         } else
7476                 chk->whoTo = NULL;
7477
7478         if (sp->holds_key_ref) {
7479                 chk->auth_keyid = sp->auth_keyid;
7480                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7481                 chk->holds_key_ref = 1;
7482         }
7483         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7484         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7485                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7486                     (uintptr_t) stcb, sp->length,
7487                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7488                     chk->rec.data.TSN_seq);
7489         }
7490         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7491         /*
7492          * Put the rest of the things in place now. Size was done earlier in
7493          * previous loop prior to padding.
7494          */
7495
7496 #ifdef SCTP_ASOCLOG_OF_TSNS
7497         SCTP_TCB_LOCK_ASSERT(stcb);
7498         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7499                 asoc->tsn_out_at = 0;
7500                 asoc->tsn_out_wrapped = 1;
7501         }
7502         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7503         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7504         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7505         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7506         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7507         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7508         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7509         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7510         asoc->tsn_out_at++;
7511 #endif
7512
7513         dchkh->ch.chunk_type = SCTP_DATA;
7514         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7515         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7516         dchkh->dp.stream_id = htons(strq->stream_no);
7517         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7518         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7519         dchkh->ch.chunk_length = htons(chk->send_size);
7520         /* Now advance the chk->send_size by the actual pad needed. */
7521         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7522                 /* need a pad */
7523                 struct mbuf *lm;
7524                 int pads;
7525
7526                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7527                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7528                         chk->pad_inplace = 1;
7529                 }
7530                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7531                         /* pad added an mbuf */
7532                         chk->last_mbuf = lm;
7533                 }
7534                 chk->send_size += pads;
7535         }
7536         /* We only re-set the policy if it is on */
7537         if (sp->pr_sctp_on) {
7538                 sctp_set_prsctp_policy(sp);
7539                 asoc->pr_sctp_cnt++;
7540                 chk->pr_sctp_on = 1;
7541         } else {
7542                 chk->pr_sctp_on = 0;
7543         }
7544         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7545                 /* All done pull and kill the message */
7546                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7547                 if (sp->put_last_out == 0) {
7548                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7549                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7550                             sp->sender_all_done,
7551                             sp->length,
7552                             sp->msg_is_complete,
7553                             sp->put_last_out,
7554                             send_lock_up);
7555                 }
7556                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7557                         SCTP_TCB_SEND_LOCK(stcb);
7558                         send_lock_up = 1;
7559                 }
7560                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7561                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7562                 if (sp->net) {
7563                         sctp_free_remote_addr(sp->net);
7564                         sp->net = NULL;
7565                 }
7566                 if (sp->data) {
7567                         sctp_m_freem(sp->data);
7568                         sp->data = NULL;
7569                 }
7570                 sctp_free_a_strmoq(stcb, sp, so_locked);
7571
7572                 /* we can't be locked to it */
7573                 *locked = 0;
7574                 stcb->asoc.locked_on_sending = NULL;
7575         } else {
7576                 /* more to go, we are locked */
7577                 *locked = 1;
7578         }
7579         asoc->chunks_on_out_queue++;
7580         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7581         asoc->send_queue_cnt++;
7582 out_of:
7583         if (send_lock_up) {
7584                 SCTP_TCB_SEND_UNLOCK(stcb);
7585         }
7586         return (to_move);
7587 }
7588
7589
7590 static void
7591 sctp_fill_outqueue(struct sctp_tcb *stcb,
7592     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7593 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7594     SCTP_UNUSED
7595 #endif
7596 )
7597 {
7598         struct sctp_association *asoc;
7599         struct sctp_stream_out *strq;
7600         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7601         int locked, giveup;
7602
7603         SCTP_TCB_LOCK_ASSERT(stcb);
7604         asoc = &stcb->asoc;
7605         switch (net->ro._l_addr.sa.sa_family) {
7606 #ifdef INET
7607         case AF_INET:
7608                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7609                 break;
7610 #endif
7611 #ifdef INET6
7612         case AF_INET6:
7613                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7614                 break;
7615 #endif
7616         default:
7617                 /* TSNH */
7618                 goal_mtu = net->mtu;
7619                 break;
7620         }
7621         /* Need an allowance for the data chunk header too */
7622         goal_mtu -= sizeof(struct sctp_data_chunk);
7623
7624         /* must make even word boundary */
7625         goal_mtu &= 0xfffffffc;
7626         if (asoc->locked_on_sending) {
7627                 /* We are stuck on one stream until the message completes. */
7628                 strq = asoc->locked_on_sending;
7629                 locked = 1;
7630         } else {
7631                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7632                 locked = 0;
7633         }
7634         while ((goal_mtu > 0) && strq) {
7635                 giveup = 0;
7636                 bail = 0;
7637                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7638                     &giveup, eeor_mode, &bail, so_locked);
7639                 if (moved_how_much)
7640                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7641
7642                 if (locked) {
7643                         asoc->locked_on_sending = strq;
7644                         if ((moved_how_much == 0) || (giveup) || bail)
7645                                 /* no more to move for now */
7646                                 break;
7647                 } else {
7648                         asoc->locked_on_sending = NULL;
7649                         if ((giveup) || bail) {
7650                                 break;
7651                         }
7652                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7653                         if (strq == NULL) {
7654                                 break;
7655                         }
7656                 }
7657                 total_moved += moved_how_much;
7658                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7659                 goal_mtu &= 0xfffffffc;
7660         }
7661         if (bail)
7662                 *quit_now = 1;
7663
7664         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7665
7666         if (total_moved == 0) {
7667                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7668                     (net == stcb->asoc.primary_destination)) {
7669                         /* ran dry for primary network net */
7670                         SCTP_STAT_INCR(sctps_primary_randry);
7671                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7672                         /* ran dry with CMT on */
7673                         SCTP_STAT_INCR(sctps_cmt_randry);
7674                 }
7675         }
7676 }
7677
7678 void
7679 sctp_fix_ecn_echo(struct sctp_association *asoc)
7680 {
7681         struct sctp_tmit_chunk *chk;
7682
7683         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7684                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7685                         chk->sent = SCTP_DATAGRAM_UNSENT;
7686                 }
7687         }
7688 }
7689
7690 void
7691 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7692 {
7693         struct sctp_association *asoc;
7694         struct sctp_tmit_chunk *chk;
7695         struct sctp_stream_queue_pending *sp;
7696         unsigned int i;
7697
7698         if (net == NULL) {
7699                 return;
7700         }
7701         asoc = &stcb->asoc;
7702         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7703                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7704                         if (sp->net == net) {
7705                                 sctp_free_remote_addr(sp->net);
7706                                 sp->net = NULL;
7707                         }
7708                 }
7709         }
7710         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7711                 if (chk->whoTo == net) {
7712                         sctp_free_remote_addr(chk->whoTo);
7713                         chk->whoTo = NULL;
7714                 }
7715         }
7716 }
7717
7718 int
7719 sctp_med_chunk_output(struct sctp_inpcb *inp,
7720     struct sctp_tcb *stcb,
7721     struct sctp_association *asoc,
7722     int *num_out,
7723     int *reason_code,
7724     int control_only, int from_where,
7725     struct timeval *now, int *now_filled, int frag_point, int so_locked
7726 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7727     SCTP_UNUSED
7728 #endif
7729 )
7730 {
7731         /*
7732          * Ok this is the generic chunk service queue. we must do the
7733          * following: - Service the stream queue that is next, moving any
7734          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7735          * LAST to the out queue in one pass) and assigning TSN's - Check to
7736          * see if the cwnd/rwnd allows any output, if so we go ahead and
7737          * fomulate and send the low level chunks. Making sure to combine
7738          * any control in the control chunk queue also.
7739          */
7740         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7741         struct mbuf *outchain, *endoutchain;
7742         struct sctp_tmit_chunk *chk, *nchk;
7743
7744         /* temp arrays for unlinking */
7745         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7746         int no_fragmentflg, error;
7747         unsigned int max_rwnd_per_dest, max_send_per_dest;
7748         int one_chunk, hbflag, skip_data_for_this_net;
7749         int asconf, cookie, no_out_cnt;
7750         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7751         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7752         int tsns_sent = 0;
7753         uint32_t auth_offset = 0;
7754         struct sctp_auth_chunk *auth = NULL;
7755         uint16_t auth_keyid;
7756         int override_ok = 1;
7757         int skip_fill_up = 0;
7758         int data_auth_reqd = 0;
7759
7760         /*
7761          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7762          * destination.
7763          */
7764         int quit_now = 0;
7765
7766         *num_out = 0;
7767         auth_keyid = stcb->asoc.authinfo.active_keyid;
7768
7769         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7770             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7771             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7772                 eeor_mode = 1;
7773         } else {
7774                 eeor_mode = 0;
7775         }
7776         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7777         /*
7778          * First lets prime the pump. For each destination, if there is room
7779          * in the flight size, attempt to pull an MTU's worth out of the
7780          * stream queues into the general send_queue
7781          */
7782 #ifdef SCTP_AUDITING_ENABLED
7783         sctp_audit_log(0xC2, 2);
7784 #endif
7785         SCTP_TCB_LOCK_ASSERT(stcb);
7786         hbflag = 0;
7787         if ((control_only) || (asoc->stream_reset_outstanding))
7788                 no_data_chunks = 1;
7789         else
7790                 no_data_chunks = 0;
7791
7792         /* Nothing to possible to send? */
7793         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7794             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7795             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7796             TAILQ_EMPTY(&asoc->send_queue) &&
7797             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7798 nothing_to_send:
7799                 *reason_code = 9;
7800                 return (0);
7801         }
7802         if (asoc->peers_rwnd == 0) {
7803                 /* No room in peers rwnd */
7804                 *reason_code = 1;
7805                 if (asoc->total_flight > 0) {
7806                         /* we are allowed one chunk in flight */
7807                         no_data_chunks = 1;
7808                 }
7809         }
7810         if (stcb->asoc.ecn_echo_cnt_onq) {
7811                 /* Record where a sack goes, if any */
7812                 if (no_data_chunks &&
7813                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7814                         /* Nothing but ECNe to send - we don't do that */
7815                         goto nothing_to_send;
7816                 }
7817                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7818                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7819                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7820                                 sack_goes_to = chk->whoTo;
7821                                 break;
7822                         }
7823                 }
7824         }
7825         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7826         if (stcb->sctp_socket)
7827                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7828         else
7829                 max_send_per_dest = 0;
7830         if (no_data_chunks == 0) {
7831                 /* How many non-directed chunks are there? */
7832                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7833                         if (chk->whoTo == NULL) {
7834                                 /*
7835                                  * We already have non-directed chunks on
7836                                  * the queue, no need to do a fill-up.
7837                                  */
7838                                 skip_fill_up = 1;
7839                                 break;
7840                         }
7841                 }
7842
7843         }
7844         if ((no_data_chunks == 0) &&
7845             (skip_fill_up == 0) &&
7846             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7847                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7848                         /*
7849                          * This for loop we are in takes in each net, if
7850                          * its's got space in cwnd and has data sent to it
7851                          * (when CMT is off) then it calls
7852                          * sctp_fill_outqueue for the net. This gets data on
7853                          * the send queue for that network.
7854                          *
7855                          * In sctp_fill_outqueue TSN's are assigned and data is
7856                          * copied out of the stream buffers. Note mostly
7857                          * copy by reference (we hope).
7858                          */
7859                         net->window_probe = 0;
7860                         if ((net != stcb->asoc.alternate) &&
7861                             ((net->dest_state & SCTP_ADDR_PF) ||
7862                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7863                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7864                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7865                                         sctp_log_cwnd(stcb, net, 1,
7866                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7867                                 }
7868                                 continue;
7869                         }
7870                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7871                             (net->flight_size == 0)) {
7872                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7873                         }
7874                         if (net->flight_size >= net->cwnd) {
7875                                 /* skip this network, no room - can't fill */
7876                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7877                                         sctp_log_cwnd(stcb, net, 3,
7878                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7879                                 }
7880                                 continue;
7881                         }
7882                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7883                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7884                         }
7885                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7886                         if (quit_now) {
7887                                 /* memory alloc failure */
7888                                 no_data_chunks = 1;
7889                                 break;
7890                         }
7891                 }
7892         }
7893         /* now service each destination and send out what we can for it */
7894         /* Nothing to send? */
7895         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7896             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7897             TAILQ_EMPTY(&asoc->send_queue)) {
7898                 *reason_code = 8;
7899                 return (0);
7900         }
7901         if (asoc->sctp_cmt_on_off > 0) {
7902                 /* get the last start point */
7903                 start_at = asoc->last_net_cmt_send_started;
7904                 if (start_at == NULL) {
7905                         /* null so to beginning */
7906                         start_at = TAILQ_FIRST(&asoc->nets);
7907                 } else {
7908                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7909                         if (start_at == NULL) {
7910                                 start_at = TAILQ_FIRST(&asoc->nets);
7911                         }
7912                 }
7913                 asoc->last_net_cmt_send_started = start_at;
7914         } else {
7915                 start_at = TAILQ_FIRST(&asoc->nets);
7916         }
7917         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7918                 if (chk->whoTo == NULL) {
7919                         if (asoc->alternate) {
7920                                 chk->whoTo = asoc->alternate;
7921                         } else {
7922                                 chk->whoTo = asoc->primary_destination;
7923                         }
7924                         atomic_add_int(&chk->whoTo->ref_count, 1);
7925                 }
7926         }
7927         old_start_at = NULL;
7928 again_one_more_time:
7929         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7930                 /* how much can we send? */
7931                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7932                 if (old_start_at && (old_start_at == net)) {
7933                         /* through list ocmpletely. */
7934                         break;
7935                 }
7936                 tsns_sent = 0xa;
7937                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7938                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7939                     (net->flight_size >= net->cwnd)) {
7940                         /*
7941                          * Nothing on control or asconf and flight is full,
7942                          * we can skip even in the CMT case.
7943                          */
7944                         continue;
7945                 }
7946                 bundle_at = 0;
7947                 endoutchain = outchain = NULL;
7948                 no_fragmentflg = 1;
7949                 one_chunk = 0;
7950                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7951                         skip_data_for_this_net = 1;
7952                 } else {
7953                         skip_data_for_this_net = 0;
7954                 }
7955                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7956                         /*
7957                          * if we have a route and an ifp check to see if we
7958                          * have room to send to this guy
7959                          */
7960                         struct ifnet *ifp;
7961
7962                         ifp = net->ro.ro_rt->rt_ifp;
7963                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7964                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7965                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7966                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7967                                 }
7968                                 continue;
7969                         }
7970                 }
7971                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7972 #ifdef INET
7973                 case AF_INET:
7974                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7975                         break;
7976 #endif
7977 #ifdef INET6
7978                 case AF_INET6:
7979                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7980                         break;
7981 #endif
7982                 default:
7983                         /* TSNH */
7984                         mtu = net->mtu;
7985                         break;
7986                 }
7987                 mx_mtu = mtu;
7988                 to_out = 0;
7989                 if (mtu > asoc->peers_rwnd) {
7990                         if (asoc->total_flight > 0) {
7991                                 /* We have a packet in flight somewhere */
7992                                 r_mtu = asoc->peers_rwnd;
7993                         } else {
7994                                 /* We are always allowed to send one MTU out */
7995                                 one_chunk = 1;
7996                                 r_mtu = mtu;
7997                         }
7998                 } else {
7999                         r_mtu = mtu;
8000                 }
8001                 /************************/
8002                 /* ASCONF transmission */
8003                 /************************/
8004                 /* Now first lets go through the asconf queue */
8005                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8006                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8007                                 continue;
8008                         }
8009                         if (chk->whoTo == NULL) {
8010                                 if (asoc->alternate == NULL) {
8011                                         if (asoc->primary_destination != net) {
8012                                                 break;
8013                                         }
8014                                 } else {
8015                                         if (asoc->alternate != net) {
8016                                                 break;
8017                                         }
8018                                 }
8019                         } else {
8020                                 if (chk->whoTo != net) {
8021                                         break;
8022                                 }
8023                         }
8024                         if (chk->data == NULL) {
8025                                 break;
8026                         }
8027                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8028                             chk->sent != SCTP_DATAGRAM_RESEND) {
8029                                 break;
8030                         }
8031                         /*
8032                          * if no AUTH is yet included and this chunk
8033                          * requires it, make sure to account for it.  We
8034                          * don't apply the size until the AUTH chunk is
8035                          * actually added below in case there is no room for
8036                          * this chunk. NOTE: we overload the use of "omtu"
8037                          * here
8038                          */
8039                         if ((auth == NULL) &&
8040                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8041                             stcb->asoc.peer_auth_chunks)) {
8042                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8043                         } else
8044                                 omtu = 0;
8045                         /* Here we do NOT factor the r_mtu */
8046                         if ((chk->send_size < (int)(mtu - omtu)) ||
8047                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8048                                 /*
8049                                  * We probably should glom the mbuf chain
8050                                  * from the chk->data for control but the
8051                                  * problem is it becomes yet one more level
8052                                  * of tracking to do if for some reason
8053                                  * output fails. Then I have got to
8054                                  * reconstruct the merged control chain.. el
8055                                  * yucko.. for now we take the easy way and
8056                                  * do the copy
8057                                  */
8058                                 /*
8059                                  * Add an AUTH chunk, if chunk requires it
8060                                  * save the offset into the chain for AUTH
8061                                  */
8062                                 if ((auth == NULL) &&
8063                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8064                                     stcb->asoc.peer_auth_chunks))) {
8065                                         outchain = sctp_add_auth_chunk(outchain,
8066                                             &endoutchain,
8067                                             &auth,
8068                                             &auth_offset,
8069                                             stcb,
8070                                             chk->rec.chunk_id.id);
8071                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8072                                 }
8073                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8074                                     (int)chk->rec.chunk_id.can_take_data,
8075                                     chk->send_size, chk->copy_by_ref);
8076                                 if (outchain == NULL) {
8077                                         *reason_code = 8;
8078                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8079                                         return (ENOMEM);
8080                                 }
8081                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8082                                 /* update our MTU size */
8083                                 if (mtu > (chk->send_size + omtu))
8084                                         mtu -= (chk->send_size + omtu);
8085                                 else
8086                                         mtu = 0;
8087                                 to_out += (chk->send_size + omtu);
8088                                 /* Do clear IP_DF ? */
8089                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8090                                         no_fragmentflg = 0;
8091                                 }
8092                                 if (chk->rec.chunk_id.can_take_data)
8093                                         chk->data = NULL;
8094                                 /*
8095                                  * set hb flag since we can use these for
8096                                  * RTO
8097                                  */
8098                                 hbflag = 1;
8099                                 asconf = 1;
8100                                 /*
8101                                  * should sysctl this: don't bundle data
8102                                  * with ASCONF since it requires AUTH
8103                                  */
8104                                 no_data_chunks = 1;
8105                                 chk->sent = SCTP_DATAGRAM_SENT;
8106                                 if (chk->whoTo == NULL) {
8107                                         chk->whoTo = net;
8108                                         atomic_add_int(&net->ref_count, 1);
8109                                 }
8110                                 chk->snd_count++;
8111                                 if (mtu == 0) {
8112                                         /*
8113                                          * Ok we are out of room but we can
8114                                          * output without effecting the
8115                                          * flight size since this little guy
8116                                          * is a control only packet.
8117                                          */
8118                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8119                                         /*
8120                                          * do NOT clear the asconf flag as
8121                                          * it is used to do appropriate
8122                                          * source address selection.
8123                                          */
8124                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8125                                             (struct sockaddr *)&net->ro._l_addr,
8126                                             outchain, auth_offset, auth,
8127                                             stcb->asoc.authinfo.active_keyid,
8128                                             no_fragmentflg, 0, asconf,
8129                                             inp->sctp_lport, stcb->rport,
8130                                             htonl(stcb->asoc.peer_vtag),
8131                                             net->port, so_locked, NULL, NULL))) {
8132                                                 if (error == ENOBUFS) {
8133                                                         asoc->ifp_had_enobuf = 1;
8134                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8135                                                 }
8136                                                 if (from_where == 0) {
8137                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8138                                                 }
8139                                                 if (*now_filled == 0) {
8140                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8141                                                         *now_filled = 1;
8142                                                         *now = net->last_sent_time;
8143                                                 } else {
8144                                                         net->last_sent_time = *now;
8145                                                 }
8146                                                 hbflag = 0;
8147                                                 /* error, could not output */
8148                                                 if (error == EHOSTUNREACH) {
8149                                                         /*
8150                                                          * Destination went
8151                                                          * unreachable
8152                                                          * during this send
8153                                                          */
8154                                                         sctp_move_chunks_from_net(stcb, net);
8155                                                 }
8156                                                 *reason_code = 7;
8157                                                 continue;
8158                                         } else
8159                                                 asoc->ifp_had_enobuf = 0;
8160                                         if (*now_filled == 0) {
8161                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8162                                                 *now_filled = 1;
8163                                                 *now = net->last_sent_time;
8164                                         } else {
8165                                                 net->last_sent_time = *now;
8166                                         }
8167                                         hbflag = 0;
8168                                         /*
8169                                          * increase the number we sent, if a
8170                                          * cookie is sent we don't tell them
8171                                          * any was sent out.
8172                                          */
8173                                         outchain = endoutchain = NULL;
8174                                         auth = NULL;
8175                                         auth_offset = 0;
8176                                         if (!no_out_cnt)
8177                                                 *num_out += ctl_cnt;
8178                                         /* recalc a clean slate and setup */
8179                                         switch (net->ro._l_addr.sa.sa_family) {
8180 #ifdef INET
8181                                         case AF_INET:
8182                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8183                                                 break;
8184 #endif
8185 #ifdef INET6
8186                                         case AF_INET6:
8187                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8188                                                 break;
8189 #endif
8190                                         default:
8191                                                 /* TSNH */
8192                                                 mtu = net->mtu;
8193                                                 break;
8194                                         }
8195                                         to_out = 0;
8196                                         no_fragmentflg = 1;
8197                                 }
8198                         }
8199                 }
8200                 /************************/
8201                 /* Control transmission */
8202                 /************************/
8203                 /* Now first lets go through the control queue */
8204                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8205                         if ((sack_goes_to) &&
8206                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8207                             (chk->whoTo != sack_goes_to)) {
8208                                 /*
8209                                  * if we have a sack in queue, and we are
8210                                  * looking at an ecn echo that is NOT queued
8211                                  * to where the sack is going..
8212                                  */
8213                                 if (chk->whoTo == net) {
8214                                         /*
8215                                          * Don't transmit it to where its
8216                                          * going (current net)
8217                                          */
8218                                         continue;
8219                                 } else if (sack_goes_to == net) {
8220                                         /*
8221                                          * But do transmit it to this
8222                                          * address
8223                                          */
8224                                         goto skip_net_check;
8225                                 }
8226                         }
8227                         if (chk->whoTo == NULL) {
8228                                 if (asoc->alternate == NULL) {
8229                                         if (asoc->primary_destination != net) {
8230                                                 continue;
8231                                         }
8232                                 } else {
8233                                         if (asoc->alternate != net) {
8234                                                 continue;
8235                                         }
8236                                 }
8237                         } else {
8238                                 if (chk->whoTo != net) {
8239                                         continue;
8240                                 }
8241                         }
8242         skip_net_check:
8243                         if (chk->data == NULL) {
8244                                 continue;
8245                         }
8246                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8247                                 /*
8248                                  * It must be unsent. Cookies and ASCONF's
8249                                  * hang around but there timers will force
8250                                  * when marked for resend.
8251                                  */
8252                                 continue;
8253                         }
8254                         /*
8255                          * if no AUTH is yet included and this chunk
8256                          * requires it, make sure to account for it.  We
8257                          * don't apply the size until the AUTH chunk is
8258                          * actually added below in case there is no room for
8259                          * this chunk. NOTE: we overload the use of "omtu"
8260                          * here
8261                          */
8262                         if ((auth == NULL) &&
8263                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8264                             stcb->asoc.peer_auth_chunks)) {
8265                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8266                         } else
8267                                 omtu = 0;
8268                         /* Here we do NOT factor the r_mtu */
8269                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8270                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8271                                 /*
8272                                  * We probably should glom the mbuf chain
8273                                  * from the chk->data for control but the
8274                                  * problem is it becomes yet one more level
8275                                  * of tracking to do if for some reason
8276                                  * output fails. Then I have got to
8277                                  * reconstruct the merged control chain.. el
8278                                  * yucko.. for now we take the easy way and
8279                                  * do the copy
8280                                  */
8281                                 /*
8282                                  * Add an AUTH chunk, if chunk requires it
8283                                  * save the offset into the chain for AUTH
8284                                  */
8285                                 if ((auth == NULL) &&
8286                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8287                                     stcb->asoc.peer_auth_chunks))) {
8288                                         outchain = sctp_add_auth_chunk(outchain,
8289                                             &endoutchain,
8290                                             &auth,
8291                                             &auth_offset,
8292                                             stcb,
8293                                             chk->rec.chunk_id.id);
8294                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8295                                 }
8296                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8297                                     (int)chk->rec.chunk_id.can_take_data,
8298                                     chk->send_size, chk->copy_by_ref);
8299                                 if (outchain == NULL) {
8300                                         *reason_code = 8;
8301                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8302                                         return (ENOMEM);
8303                                 }
8304                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8305                                 /* update our MTU size */
8306                                 if (mtu > (chk->send_size + omtu))
8307                                         mtu -= (chk->send_size + omtu);
8308                                 else
8309                                         mtu = 0;
8310                                 to_out += (chk->send_size + omtu);
8311                                 /* Do clear IP_DF ? */
8312                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8313                                         no_fragmentflg = 0;
8314                                 }
8315                                 if (chk->rec.chunk_id.can_take_data)
8316                                         chk->data = NULL;
8317                                 /* Mark things to be removed, if needed */
8318                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8319                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8320                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8321                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8322                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8323                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8324                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8325                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8326                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8327                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8328                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8329                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8330                                                 hbflag = 1;
8331                                         }
8332                                         /* remove these chunks at the end */
8333                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8334                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8335                                                 /* turn off the timer */
8336                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8337                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8338                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8339                                                 }
8340                                         }
8341                                         ctl_cnt++;
8342                                 } else {
8343                                         /*
8344                                          * Other chunks, since they have
8345                                          * timers running (i.e. COOKIE) we
8346                                          * just "trust" that it gets sent or
8347                                          * retransmitted.
8348                                          */
8349                                         ctl_cnt++;
8350                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8351                                                 cookie = 1;
8352                                                 no_out_cnt = 1;
8353                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8354                                                 /*
8355                                                  * Increment ecne send count
8356                                                  * here this means we may be
8357                                                  * over-zealous in our
8358                                                  * counting if the send
8359                                                  * fails, but its the best
8360                                                  * place to do it (we used
8361                                                  * to do it in the queue of
8362                                                  * the chunk, but that did
8363                                                  * not tell how many times
8364                                                  * it was sent.
8365                                                  */
8366                                                 SCTP_STAT_INCR(sctps_sendecne);
8367                                         }
8368                                         chk->sent = SCTP_DATAGRAM_SENT;
8369                                         if (chk->whoTo == NULL) {
8370                                                 chk->whoTo = net;
8371                                                 atomic_add_int(&net->ref_count, 1);
8372                                         }
8373                                         chk->snd_count++;
8374                                 }
8375                                 if (mtu == 0) {
8376                                         /*
8377                                          * Ok we are out of room but we can
8378                                          * output without effecting the
8379                                          * flight size since this little guy
8380                                          * is a control only packet.
8381                                          */
8382                                         if (asconf) {
8383                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8384                                                 /*
8385                                                  * do NOT clear the asconf
8386                                                  * flag as it is used to do
8387                                                  * appropriate source
8388                                                  * address selection.
8389                                                  */
8390                                         }
8391                                         if (cookie) {
8392                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8393                                                 cookie = 0;
8394                                         }
8395                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8396                                             (struct sockaddr *)&net->ro._l_addr,
8397                                             outchain,
8398                                             auth_offset, auth,
8399                                             stcb->asoc.authinfo.active_keyid,
8400                                             no_fragmentflg, 0, asconf,
8401                                             inp->sctp_lport, stcb->rport,
8402                                             htonl(stcb->asoc.peer_vtag),
8403                                             net->port, so_locked, NULL, NULL))) {
8404                                                 if (error == ENOBUFS) {
8405                                                         asoc->ifp_had_enobuf = 1;
8406                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8407                                                 }
8408                                                 if (from_where == 0) {
8409                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8410                                                 }
8411                                                 /* error, could not output */
8412                                                 if (hbflag) {
8413                                                         if (*now_filled == 0) {
8414                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8415                                                                 *now_filled = 1;
8416                                                                 *now = net->last_sent_time;
8417                                                         } else {
8418                                                                 net->last_sent_time = *now;
8419                                                         }
8420                                                         hbflag = 0;
8421                                                 }
8422                                                 if (error == EHOSTUNREACH) {
8423                                                         /*
8424                                                          * Destination went
8425                                                          * unreachable
8426                                                          * during this send
8427                                                          */
8428                                                         sctp_move_chunks_from_net(stcb, net);
8429                                                 }
8430                                                 *reason_code = 7;
8431                                                 continue;
8432                                         } else
8433                                                 asoc->ifp_had_enobuf = 0;
8434                                         /* Only HB or ASCONF advances time */
8435                                         if (hbflag) {
8436                                                 if (*now_filled == 0) {
8437                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8438                                                         *now_filled = 1;
8439                                                         *now = net->last_sent_time;
8440                                                 } else {
8441                                                         net->last_sent_time = *now;
8442                                                 }
8443                                                 hbflag = 0;
8444                                         }
8445                                         /*
8446                                          * increase the number we sent, if a
8447                                          * cookie is sent we don't tell them
8448                                          * any was sent out.
8449                                          */
8450                                         outchain = endoutchain = NULL;
8451                                         auth = NULL;
8452                                         auth_offset = 0;
8453                                         if (!no_out_cnt)
8454                                                 *num_out += ctl_cnt;
8455                                         /* recalc a clean slate and setup */
8456                                         switch (net->ro._l_addr.sa.sa_family) {
8457 #ifdef INET
8458                                         case AF_INET:
8459                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8460                                                 break;
8461 #endif
8462 #ifdef INET6
8463                                         case AF_INET6:
8464                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8465                                                 break;
8466 #endif
8467                                         default:
8468                                                 /* TSNH */
8469                                                 mtu = net->mtu;
8470                                                 break;
8471                                         }
8472                                         to_out = 0;
8473                                         no_fragmentflg = 1;
8474                                 }
8475                         }
8476                 }
8477                 /* JRI: if dest is in PF state, do not send data to it */
8478                 if ((asoc->sctp_cmt_on_off > 0) &&
8479                     (net != stcb->asoc.alternate) &&
8480                     (net->dest_state & SCTP_ADDR_PF)) {
8481                         goto no_data_fill;
8482                 }
8483                 if (net->flight_size >= net->cwnd) {
8484                         goto no_data_fill;
8485                 }
8486                 if ((asoc->sctp_cmt_on_off > 0) &&
8487                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8488                     (net->flight_size > max_rwnd_per_dest)) {
8489                         goto no_data_fill;
8490                 }
8491                 /*
8492                  * We need a specific accounting for the usage of the send
8493                  * buffer. We also need to check the number of messages per
8494                  * net. For now, this is better than nothing and it disabled
8495                  * by default...
8496                  */
8497                 if ((asoc->sctp_cmt_on_off > 0) &&
8498                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8499                     (max_send_per_dest > 0) &&
8500                     (net->flight_size > max_send_per_dest)) {
8501                         goto no_data_fill;
8502                 }
8503                 /*********************/
8504                 /* Data transmission */
8505                 /*********************/
8506                 /*
8507                  * if AUTH for DATA is required and no AUTH has been added
8508                  * yet, account for this in the mtu now... if no data can be
8509                  * bundled, this adjustment won't matter anyways since the
8510                  * packet will be going out...
8511                  */
8512                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8513                     stcb->asoc.peer_auth_chunks);
8514                 if (data_auth_reqd && (auth == NULL)) {
8515                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8516                 }
8517                 /* now lets add any data within the MTU constraints */
8518                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8519                 case AF_INET:
8520                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8521                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8522                         else
8523                                 omtu = 0;
8524                         break;
8525 #ifdef INET6
8526                 case AF_INET6:
8527                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8528                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8529                         else
8530                                 omtu = 0;
8531                         break;
8532 #endif
8533                 default:
8534                         /* TSNH */
8535                         omtu = 0;
8536                         break;
8537                 }
8538                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8539                     (skip_data_for_this_net == 0)) ||
8540                     (cookie)) {
8541                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8542                                 if (no_data_chunks) {
8543                                         /* let only control go out */
8544                                         *reason_code = 1;
8545                                         break;
8546                                 }
8547                                 if (net->flight_size >= net->cwnd) {
8548                                         /* skip this net, no room for data */
8549                                         *reason_code = 2;
8550                                         break;
8551                                 }
8552                                 if ((chk->whoTo != NULL) &&
8553                                     (chk->whoTo != net)) {
8554                                         /* Don't send the chunk on this net */
8555                                         continue;
8556                                 }
8557                                 if (asoc->sctp_cmt_on_off == 0) {
8558                                         if ((asoc->alternate) &&
8559                                             (asoc->alternate != net) &&
8560                                             (chk->whoTo == NULL)) {
8561                                                 continue;
8562                                         } else if ((net != asoc->primary_destination) &&
8563                                                     (asoc->alternate == NULL) &&
8564                                             (chk->whoTo == NULL)) {
8565                                                 continue;
8566                                         }
8567                                 }
8568                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8569                                         /*-
8570                                          * strange, we have a chunk that is
8571                                          * to big for its destination and
8572                                          * yet no fragment ok flag.
8573                                          * Something went wrong when the
8574                                          * PMTU changed...we did not mark
8575                                          * this chunk for some reason?? I
8576                                          * will fix it here by letting IP
8577                                          * fragment it for now and printing
8578                                          * a warning. This really should not
8579                                          * happen ...
8580                                          */
8581                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8582                                             chk->send_size, mtu);
8583                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8584                                 }
8585                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8586                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8587                                         struct sctp_data_chunk *dchkh;
8588
8589                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8590                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8591                                 }
8592                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8593                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8594                                         /* ok we will add this one */
8595
8596                                         /*
8597                                          * Add an AUTH chunk, if chunk
8598                                          * requires it, save the offset into
8599                                          * the chain for AUTH
8600                                          */
8601                                         if (data_auth_reqd) {
8602                                                 if (auth == NULL) {
8603                                                         outchain = sctp_add_auth_chunk(outchain,
8604                                                             &endoutchain,
8605                                                             &auth,
8606                                                             &auth_offset,
8607                                                             stcb,
8608                                                             SCTP_DATA);
8609                                                         auth_keyid = chk->auth_keyid;
8610                                                         override_ok = 0;
8611                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8612                                                 } else if (override_ok) {
8613                                                         /*
8614                                                          * use this data's
8615                                                          * keyid
8616                                                          */
8617                                                         auth_keyid = chk->auth_keyid;
8618                                                         override_ok = 0;
8619                                                 } else if (auth_keyid != chk->auth_keyid) {
8620                                                         /*
8621                                                          * different keyid,
8622                                                          * so done bundling
8623                                                          */
8624                                                         break;
8625                                                 }
8626                                         }
8627                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8628                                             chk->send_size, chk->copy_by_ref);
8629                                         if (outchain == NULL) {
8630                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8631                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8632                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8633                                                 }
8634                                                 *reason_code = 3;
8635                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8636                                                 return (ENOMEM);
8637                                         }
8638                                         /* upate our MTU size */
8639                                         /* Do clear IP_DF ? */
8640                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8641                                                 no_fragmentflg = 0;
8642                                         }
8643                                         /* unsigned subtraction of mtu */
8644                                         if (mtu > chk->send_size)
8645                                                 mtu -= chk->send_size;
8646                                         else
8647                                                 mtu = 0;
8648                                         /* unsigned subtraction of r_mtu */
8649                                         if (r_mtu > chk->send_size)
8650                                                 r_mtu -= chk->send_size;
8651                                         else
8652                                                 r_mtu = 0;
8653
8654                                         to_out += chk->send_size;
8655                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8656 #ifdef INVARIANTS
8657                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8658 #else
8659                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8660                                                     mx_mtu, to_out);
8661 #endif
8662                                         }
8663                                         chk->window_probe = 0;
8664                                         data_list[bundle_at++] = chk;
8665                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8666                                                 break;
8667                                         }
8668                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8669                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8670                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8671                                                 } else {
8672                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8673                                                 }
8674                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8675                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8676                                                         /*
8677                                                          * Count number of
8678                                                          * user msg's that
8679                                                          * were fragmented
8680                                                          * we do this by
8681                                                          * counting when we
8682                                                          * see a LAST
8683                                                          * fragment only.
8684                                                          */
8685                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8686                                         }
8687                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8688                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8689                                                         data_list[0]->window_probe = 1;
8690                                                         net->window_probe = 1;
8691                                                 }
8692                                                 break;
8693                                         }
8694                                 } else {
8695                                         /*
8696                                          * Must be sent in order of the
8697                                          * TSN's (on a network)
8698                                          */
8699                                         break;
8700                                 }
8701                         }       /* for (chunk gather loop for this net) */
8702                 }               /* if asoc.state OPEN */
8703 no_data_fill:
8704                 /* Is there something to send for this destination? */
8705                 if (outchain) {
8706                         /* We may need to start a control timer or two */
8707                         if (asconf) {
8708                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8709                                     stcb, net);
8710                                 /*
8711                                  * do NOT clear the asconf flag as it is
8712                                  * used to do appropriate source address
8713                                  * selection.
8714                                  */
8715                         }
8716                         if (cookie) {
8717                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8718                                 cookie = 0;
8719                         }
8720                         /* must start a send timer if data is being sent */
8721                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8722                                 /*
8723                                  * no timer running on this destination
8724                                  * restart it.
8725                                  */
8726                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8727                         }
8728                         /* Now send it, if there is anything to send :> */
8729                         if ((error = sctp_lowlevel_chunk_output(inp,
8730                             stcb,
8731                             net,
8732                             (struct sockaddr *)&net->ro._l_addr,
8733                             outchain,
8734                             auth_offset,
8735                             auth,
8736                             auth_keyid,
8737                             no_fragmentflg,
8738                             bundle_at,
8739                             asconf,
8740                             inp->sctp_lport, stcb->rport,
8741                             htonl(stcb->asoc.peer_vtag),
8742                             net->port, so_locked, NULL, NULL))) {
8743                                 /* error, we could not output */
8744                                 if (error == ENOBUFS) {
8745                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8746                                         asoc->ifp_had_enobuf = 1;
8747                                 }
8748                                 if (from_where == 0) {
8749                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8750                                 }
8751                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8752                                 if (hbflag) {
8753                                         if (*now_filled == 0) {
8754                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8755                                                 *now_filled = 1;
8756                                                 *now = net->last_sent_time;
8757                                         } else {
8758                                                 net->last_sent_time = *now;
8759                                         }
8760                                         hbflag = 0;
8761                                 }
8762                                 if (error == EHOSTUNREACH) {
8763                                         /*
8764                                          * Destination went unreachable
8765                                          * during this send
8766                                          */
8767                                         sctp_move_chunks_from_net(stcb, net);
8768                                 }
8769                                 *reason_code = 6;
8770                                 /*-
8771                                  * I add this line to be paranoid. As far as
8772                                  * I can tell the continue, takes us back to
8773                                  * the top of the for, but just to make sure
8774                                  * I will reset these again here.
8775                                  */
8776                                 ctl_cnt = bundle_at = 0;
8777                                 continue;       /* This takes us back to the
8778                                                  * for() for the nets. */
8779                         } else {
8780                                 asoc->ifp_had_enobuf = 0;
8781                         }
8782                         endoutchain = NULL;
8783                         auth = NULL;
8784                         auth_offset = 0;
8785                         if (bundle_at || hbflag) {
8786                                 /* For data/asconf and hb set time */
8787                                 if (*now_filled == 0) {
8788                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8789                                         *now_filled = 1;
8790                                         *now = net->last_sent_time;
8791                                 } else {
8792                                         net->last_sent_time = *now;
8793                                 }
8794                         }
8795                         if (!no_out_cnt) {
8796                                 *num_out += (ctl_cnt + bundle_at);
8797                         }
8798                         if (bundle_at) {
8799                                 /* setup for a RTO measurement */
8800                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8801                                 /* fill time if not already filled */
8802                                 if (*now_filled == 0) {
8803                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8804                                         *now_filled = 1;
8805                                         *now = asoc->time_last_sent;
8806                                 } else {
8807                                         asoc->time_last_sent = *now;
8808                                 }
8809                                 if (net->rto_needed) {
8810                                         data_list[0]->do_rtt = 1;
8811                                         net->rto_needed = 0;
8812                                 }
8813                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8814                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8815                         }
8816                         if (one_chunk) {
8817                                 break;
8818                         }
8819                 }
8820                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8821                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8822                 }
8823         }
8824         if (old_start_at == NULL) {
8825                 old_start_at = start_at;
8826                 start_at = TAILQ_FIRST(&asoc->nets);
8827                 if (old_start_at)
8828                         goto again_one_more_time;
8829         }
8830         /*
8831          * At the end there should be no NON timed chunks hanging on this
8832          * queue.
8833          */
8834         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8835                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8836         }
8837         if ((*num_out == 0) && (*reason_code == 0)) {
8838                 *reason_code = 4;
8839         } else {
8840                 *reason_code = 5;
8841         }
8842         sctp_clean_up_ctl(stcb, asoc, so_locked);
8843         return (0);
8844 }
8845
8846 void
8847 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8848 {
8849         /*-
8850          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8851          * the control chunk queue.
8852          */
8853         struct sctp_chunkhdr *hdr;
8854         struct sctp_tmit_chunk *chk;
8855         struct mbuf *mat;
8856
8857         SCTP_TCB_LOCK_ASSERT(stcb);
8858         sctp_alloc_a_chunk(stcb, chk);
8859         if (chk == NULL) {
8860                 /* no memory */
8861                 sctp_m_freem(op_err);
8862                 return;
8863         }
8864         chk->copy_by_ref = 0;
8865         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8866         if (op_err == NULL) {
8867                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8868                 return;
8869         }
8870         chk->send_size = 0;
8871         mat = op_err;
8872         while (mat != NULL) {
8873                 chk->send_size += SCTP_BUF_LEN(mat);
8874                 mat = SCTP_BUF_NEXT(mat);
8875         }
8876         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8877         chk->rec.chunk_id.can_take_data = 1;
8878         chk->sent = SCTP_DATAGRAM_UNSENT;
8879         chk->snd_count = 0;
8880         chk->flags = 0;
8881         chk->asoc = &stcb->asoc;
8882         chk->data = op_err;
8883         chk->whoTo = NULL;
8884         hdr = mtod(op_err, struct sctp_chunkhdr *);
8885         hdr->chunk_type = SCTP_OPERATION_ERROR;
8886         hdr->chunk_flags = 0;
8887         hdr->chunk_length = htons(chk->send_size);
8888         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8889             chk,
8890             sctp_next);
8891         chk->asoc->ctrl_queue_cnt++;
8892 }
8893
8894 int
8895 sctp_send_cookie_echo(struct mbuf *m,
8896     int offset,
8897     struct sctp_tcb *stcb,
8898     struct sctp_nets *net)
8899 {
8900         /*-
8901          * pull out the cookie and put it at the front of the control chunk
8902          * queue.
8903          */
8904         int at;
8905         struct mbuf *cookie;
8906         struct sctp_paramhdr parm, *phdr;
8907         struct sctp_chunkhdr *hdr;
8908         struct sctp_tmit_chunk *chk;
8909         uint16_t ptype, plen;
8910
8911         /* First find the cookie in the param area */
8912         cookie = NULL;
8913         at = offset + sizeof(struct sctp_init_chunk);
8914
8915         SCTP_TCB_LOCK_ASSERT(stcb);
8916         do {
8917                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8918                 if (phdr == NULL) {
8919                         return (-3);
8920                 }
8921                 ptype = ntohs(phdr->param_type);
8922                 plen = ntohs(phdr->param_length);
8923                 if (ptype == SCTP_STATE_COOKIE) {
8924                         int pad;
8925
8926                         /* found the cookie */
8927                         if ((pad = (plen % 4))) {
8928                                 plen += 4 - pad;
8929                         }
8930                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8931                         if (cookie == NULL) {
8932                                 /* No memory */
8933                                 return (-2);
8934                         }
8935 #ifdef SCTP_MBUF_LOGGING
8936                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8937                                 struct mbuf *mat;
8938
8939                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8940                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8941                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8942                                         }
8943                                 }
8944                         }
8945 #endif
8946                         break;
8947                 }
8948                 at += SCTP_SIZE32(plen);
8949         } while (phdr);
8950         if (cookie == NULL) {
8951                 /* Did not find the cookie */
8952                 return (-3);
8953         }
8954         /* ok, we got the cookie lets change it into a cookie echo chunk */
8955
8956         /* first the change from param to cookie */
8957         hdr = mtod(cookie, struct sctp_chunkhdr *);
8958         hdr->chunk_type = SCTP_COOKIE_ECHO;
8959         hdr->chunk_flags = 0;
8960         /* get the chunk stuff now and place it in the FRONT of the queue */
8961         sctp_alloc_a_chunk(stcb, chk);
8962         if (chk == NULL) {
8963                 /* no memory */
8964                 sctp_m_freem(cookie);
8965                 return (-5);
8966         }
8967         chk->copy_by_ref = 0;
8968         chk->send_size = plen;
8969         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8970         chk->rec.chunk_id.can_take_data = 0;
8971         chk->sent = SCTP_DATAGRAM_UNSENT;
8972         chk->snd_count = 0;
8973         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8974         chk->asoc = &stcb->asoc;
8975         chk->data = cookie;
8976         chk->whoTo = net;
8977         atomic_add_int(&chk->whoTo->ref_count, 1);
8978         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8979         chk->asoc->ctrl_queue_cnt++;
8980         return (0);
8981 }
8982
8983 void
8984 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8985     struct mbuf *m,
8986     int offset,
8987     int chk_length,
8988     struct sctp_nets *net)
8989 {
8990         /*
8991          * take a HB request and make it into a HB ack and send it.
8992          */
8993         struct mbuf *outchain;
8994         struct sctp_chunkhdr *chdr;
8995         struct sctp_tmit_chunk *chk;
8996
8997
8998         if (net == NULL)
8999                 /* must have a net pointer */
9000                 return;
9001
9002         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
9003         if (outchain == NULL) {
9004                 /* gak out of memory */
9005                 return;
9006         }
9007 #ifdef SCTP_MBUF_LOGGING
9008         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9009                 struct mbuf *mat;
9010
9011                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9012                         if (SCTP_BUF_IS_EXTENDED(mat)) {
9013                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9014                         }
9015                 }
9016         }
9017 #endif
9018         chdr = mtod(outchain, struct sctp_chunkhdr *);
9019         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9020         chdr->chunk_flags = 0;
9021         if (chk_length % 4) {
9022                 /* need pad */
9023                 uint32_t cpthis = 0;
9024                 int padlen;
9025
9026                 padlen = 4 - (chk_length % 4);
9027                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9028         }
9029         sctp_alloc_a_chunk(stcb, chk);
9030         if (chk == NULL) {
9031                 /* no memory */
9032                 sctp_m_freem(outchain);
9033                 return;
9034         }
9035         chk->copy_by_ref = 0;
9036         chk->send_size = chk_length;
9037         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9038         chk->rec.chunk_id.can_take_data = 1;
9039         chk->sent = SCTP_DATAGRAM_UNSENT;
9040         chk->snd_count = 0;
9041         chk->flags = 0;
9042         chk->asoc = &stcb->asoc;
9043         chk->data = outchain;
9044         chk->whoTo = net;
9045         atomic_add_int(&chk->whoTo->ref_count, 1);
9046         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9047         chk->asoc->ctrl_queue_cnt++;
9048 }
9049
9050 void
9051 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9052 {
9053         /* formulate and queue a cookie-ack back to sender */
9054         struct mbuf *cookie_ack;
9055         struct sctp_chunkhdr *hdr;
9056         struct sctp_tmit_chunk *chk;
9057
9058         cookie_ack = NULL;
9059         SCTP_TCB_LOCK_ASSERT(stcb);
9060
9061         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9062         if (cookie_ack == NULL) {
9063                 /* no mbuf's */
9064                 return;
9065         }
9066         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9067         sctp_alloc_a_chunk(stcb, chk);
9068         if (chk == NULL) {
9069                 /* no memory */
9070                 sctp_m_freem(cookie_ack);
9071                 return;
9072         }
9073         chk->copy_by_ref = 0;
9074         chk->send_size = sizeof(struct sctp_chunkhdr);
9075         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9076         chk->rec.chunk_id.can_take_data = 1;
9077         chk->sent = SCTP_DATAGRAM_UNSENT;
9078         chk->snd_count = 0;
9079         chk->flags = 0;
9080         chk->asoc = &stcb->asoc;
9081         chk->data = cookie_ack;
9082         if (chk->asoc->last_control_chunk_from != NULL) {
9083                 chk->whoTo = chk->asoc->last_control_chunk_from;
9084                 atomic_add_int(&chk->whoTo->ref_count, 1);
9085         } else {
9086                 chk->whoTo = NULL;
9087         }
9088         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9089         hdr->chunk_type = SCTP_COOKIE_ACK;
9090         hdr->chunk_flags = 0;
9091         hdr->chunk_length = htons(chk->send_size);
9092         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9093         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9094         chk->asoc->ctrl_queue_cnt++;
9095         return;
9096 }
9097
9098
9099 void
9100 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9101 {
9102         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9103         struct mbuf *m_shutdown_ack;
9104         struct sctp_shutdown_ack_chunk *ack_cp;
9105         struct sctp_tmit_chunk *chk;
9106
9107         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9108         if (m_shutdown_ack == NULL) {
9109                 /* no mbuf's */
9110                 return;
9111         }
9112         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9113         sctp_alloc_a_chunk(stcb, chk);
9114         if (chk == NULL) {
9115                 /* no memory */
9116                 sctp_m_freem(m_shutdown_ack);
9117                 return;
9118         }
9119         chk->copy_by_ref = 0;
9120         chk->send_size = sizeof(struct sctp_chunkhdr);
9121         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9122         chk->rec.chunk_id.can_take_data = 1;
9123         chk->sent = SCTP_DATAGRAM_UNSENT;
9124         chk->snd_count = 0;
9125         chk->flags = 0;
9126         chk->asoc = &stcb->asoc;
9127         chk->data = m_shutdown_ack;
9128         chk->whoTo = net;
9129         if (chk->whoTo) {
9130                 atomic_add_int(&chk->whoTo->ref_count, 1);
9131         }
9132         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9133         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9134         ack_cp->ch.chunk_flags = 0;
9135         ack_cp->ch.chunk_length = htons(chk->send_size);
9136         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9137         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9138         chk->asoc->ctrl_queue_cnt++;
9139         return;
9140 }
9141
9142 void
9143 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9144 {
9145         /* formulate and queue a SHUTDOWN to the sender */
9146         struct mbuf *m_shutdown;
9147         struct sctp_shutdown_chunk *shutdown_cp;
9148         struct sctp_tmit_chunk *chk;
9149
9150         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9151         if (m_shutdown == NULL) {
9152                 /* no mbuf's */
9153                 return;
9154         }
9155         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9156         sctp_alloc_a_chunk(stcb, chk);
9157         if (chk == NULL) {
9158                 /* no memory */
9159                 sctp_m_freem(m_shutdown);
9160                 return;
9161         }
9162         chk->copy_by_ref = 0;
9163         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9164         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9165         chk->rec.chunk_id.can_take_data = 1;
9166         chk->sent = SCTP_DATAGRAM_UNSENT;
9167         chk->snd_count = 0;
9168         chk->flags = 0;
9169         chk->asoc = &stcb->asoc;
9170         chk->data = m_shutdown;
9171         chk->whoTo = net;
9172         if (chk->whoTo) {
9173                 atomic_add_int(&chk->whoTo->ref_count, 1);
9174         }
9175         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9176         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9177         shutdown_cp->ch.chunk_flags = 0;
9178         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9179         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9180         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9181         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9182         chk->asoc->ctrl_queue_cnt++;
9183         return;
9184 }
9185
9186 void
9187 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9188 {
9189         /*
9190          * formulate and queue an ASCONF to the peer. ASCONF parameters
9191          * should be queued on the assoc queue.
9192          */
9193         struct sctp_tmit_chunk *chk;
9194         struct mbuf *m_asconf;
9195         int len;
9196
9197         SCTP_TCB_LOCK_ASSERT(stcb);
9198
9199         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9200             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9201                 /* can't send a new one if there is one in flight already */
9202                 return;
9203         }
9204         /* compose an ASCONF chunk, maximum length is PMTU */
9205         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9206         if (m_asconf == NULL) {
9207                 return;
9208         }
9209         sctp_alloc_a_chunk(stcb, chk);
9210         if (chk == NULL) {
9211                 /* no memory */
9212                 sctp_m_freem(m_asconf);
9213                 return;
9214         }
9215         chk->copy_by_ref = 0;
9216         chk->data = m_asconf;
9217         chk->send_size = len;
9218         chk->rec.chunk_id.id = SCTP_ASCONF;
9219         chk->rec.chunk_id.can_take_data = 0;
9220         chk->sent = SCTP_DATAGRAM_UNSENT;
9221         chk->snd_count = 0;
9222         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9223         chk->asoc = &stcb->asoc;
9224         chk->whoTo = net;
9225         if (chk->whoTo) {
9226                 atomic_add_int(&chk->whoTo->ref_count, 1);
9227         }
9228         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9229         chk->asoc->ctrl_queue_cnt++;
9230         return;
9231 }
9232
9233 void
9234 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9235 {
9236         /*
9237          * formulate and queue a asconf-ack back to sender. the asconf-ack
9238          * must be stored in the tcb.
9239          */
9240         struct sctp_tmit_chunk *chk;
9241         struct sctp_asconf_ack *ack, *latest_ack;
9242         struct mbuf *m_ack;
9243         struct sctp_nets *net = NULL;
9244
9245         SCTP_TCB_LOCK_ASSERT(stcb);
9246         /* Get the latest ASCONF-ACK */
9247         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9248         if (latest_ack == NULL) {
9249                 return;
9250         }
9251         if (latest_ack->last_sent_to != NULL &&
9252             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9253                 /* we're doing a retransmission */
9254                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9255                 if (net == NULL) {
9256                         /* no alternate */
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         } else {
9268                 /* normal case */
9269                 if (stcb->asoc.last_control_chunk_from == NULL) {
9270                         if (stcb->asoc.alternate) {
9271                                 net = stcb->asoc.alternate;
9272                         } else {
9273                                 net = stcb->asoc.primary_destination;
9274                         }
9275                 } else {
9276                         net = stcb->asoc.last_control_chunk_from;
9277                 }
9278         }
9279         latest_ack->last_sent_to = net;
9280
9281         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9282                 if (ack->data == NULL) {
9283                         continue;
9284                 }
9285                 /* copy the asconf_ack */
9286                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9287                 if (m_ack == NULL) {
9288                         /* couldn't copy it */
9289                         return;
9290                 }
9291 #ifdef SCTP_MBUF_LOGGING
9292                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9293                         struct mbuf *mat;
9294
9295                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9296                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9297                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9298                                 }
9299                         }
9300                 }
9301 #endif
9302
9303                 sctp_alloc_a_chunk(stcb, chk);
9304                 if (chk == NULL) {
9305                         /* no memory */
9306                         if (m_ack)
9307                                 sctp_m_freem(m_ack);
9308                         return;
9309                 }
9310                 chk->copy_by_ref = 0;
9311
9312                 chk->whoTo = net;
9313                 if (chk->whoTo) {
9314                         atomic_add_int(&chk->whoTo->ref_count, 1);
9315                 }
9316                 chk->data = m_ack;
9317                 chk->send_size = 0;
9318                 /* Get size */
9319                 chk->send_size = ack->len;
9320                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9321                 chk->rec.chunk_id.can_take_data = 1;
9322                 chk->sent = SCTP_DATAGRAM_UNSENT;
9323                 chk->snd_count = 0;
9324                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9325                 chk->asoc = &stcb->asoc;
9326
9327                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9328                 chk->asoc->ctrl_queue_cnt++;
9329         }
9330         return;
9331 }
9332
9333
9334 static int
9335 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9336     struct sctp_tcb *stcb,
9337     struct sctp_association *asoc,
9338     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9339 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9340     SCTP_UNUSED
9341 #endif
9342 )
9343 {
9344         /*-
9345          * send out one MTU of retransmission. If fast_retransmit is
9346          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9347          * rwnd. For a Cookie or Asconf in the control chunk queue we
9348          * retransmit them by themselves.
9349          *
9350          * For data chunks we will pick out the lowest TSN's in the sent_queue
9351          * marked for resend and bundle them all together (up to a MTU of
9352          * destination). The address to send to should have been
9353          * selected/changed where the retransmission was marked (i.e. in FR
9354          * or t3-timeout routines).
9355          */
9356         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9357         struct sctp_tmit_chunk *chk, *fwd;
9358         struct mbuf *m, *endofchain;
9359         struct sctp_nets *net = NULL;
9360         uint32_t tsns_sent = 0;
9361         int no_fragmentflg, bundle_at, cnt_thru;
9362         unsigned int mtu;
9363         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9364         struct sctp_auth_chunk *auth = NULL;
9365         uint32_t auth_offset = 0;
9366         uint16_t auth_keyid;
9367         int override_ok = 1;
9368         int data_auth_reqd = 0;
9369         uint32_t dmtu = 0;
9370
9371         SCTP_TCB_LOCK_ASSERT(stcb);
9372         tmr_started = ctl_cnt = bundle_at = error = 0;
9373         no_fragmentflg = 1;
9374         fwd_tsn = 0;
9375         *cnt_out = 0;
9376         fwd = NULL;
9377         endofchain = m = NULL;
9378         auth_keyid = stcb->asoc.authinfo.active_keyid;
9379 #ifdef SCTP_AUDITING_ENABLED
9380         sctp_audit_log(0xC3, 1);
9381 #endif
9382         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9383             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9384                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9385                     asoc->sent_queue_retran_cnt);
9386                 asoc->sent_queue_cnt = 0;
9387                 asoc->sent_queue_cnt_removeable = 0;
9388                 /* send back 0/0 so we enter normal transmission */
9389                 *cnt_out = 0;
9390                 return (0);
9391         }
9392         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9393                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9394                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9395                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9396                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9397                                 continue;
9398                         }
9399                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9400                                 if (chk != asoc->str_reset) {
9401                                         /*
9402                                          * not eligible for retran if its
9403                                          * not ours
9404                                          */
9405                                         continue;
9406                                 }
9407                         }
9408                         ctl_cnt++;
9409                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9410                                 fwd_tsn = 1;
9411                         }
9412                         /*
9413                          * Add an AUTH chunk, if chunk requires it save the
9414                          * offset into the chain for AUTH
9415                          */
9416                         if ((auth == NULL) &&
9417                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9418                             stcb->asoc.peer_auth_chunks))) {
9419                                 m = sctp_add_auth_chunk(m, &endofchain,
9420                                     &auth, &auth_offset,
9421                                     stcb,
9422                                     chk->rec.chunk_id.id);
9423                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9424                         }
9425                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9426                         break;
9427                 }
9428         }
9429         one_chunk = 0;
9430         cnt_thru = 0;
9431         /* do we have control chunks to retransmit? */
9432         if (m != NULL) {
9433                 /* Start a timer no matter if we suceed or fail */
9434                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9435                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9436                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9437                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9438                 chk->snd_count++;       /* update our count */
9439                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9440                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9441                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9442                     no_fragmentflg, 0, 0,
9443                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9444                     chk->whoTo->port, so_locked, NULL, NULL))) {
9445                         SCTP_STAT_INCR(sctps_lowlevelerr);
9446                         return (error);
9447                 }
9448                 endofchain = NULL;
9449                 auth = NULL;
9450                 auth_offset = 0;
9451                 /*
9452                  * We don't want to mark the net->sent time here since this
9453                  * we use this for HB and retrans cannot measure RTT
9454                  */
9455                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9456                 *cnt_out += 1;
9457                 chk->sent = SCTP_DATAGRAM_SENT;
9458                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9459                 if (fwd_tsn == 0) {
9460                         return (0);
9461                 } else {
9462                         /* Clean up the fwd-tsn list */
9463                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9464                         return (0);
9465                 }
9466         }
9467         /*
9468          * Ok, it is just data retransmission we need to do or that and a
9469          * fwd-tsn with it all.
9470          */
9471         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9472                 return (SCTP_RETRAN_DONE);
9473         }
9474         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9475             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9476                 /* not yet open, resend the cookie and that is it */
9477                 return (1);
9478         }
9479 #ifdef SCTP_AUDITING_ENABLED
9480         sctp_auditing(20, inp, stcb, NULL);
9481 #endif
9482         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9483         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9484                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9485                         /* No, not sent to this net or not ready for rtx */
9486                         continue;
9487                 }
9488                 if (chk->data == NULL) {
9489                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9490                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9491                         continue;
9492                 }
9493                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9494                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9495                         /* Gak, we have exceeded max unlucky retran, abort! */
9496                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9497                             chk->snd_count,
9498                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9499                         atomic_add_int(&stcb->asoc.refcnt, 1);
9500                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9501                         SCTP_TCB_LOCK(stcb);
9502                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9503                         return (SCTP_RETRAN_EXIT);
9504                 }
9505                 /* pick up the net */
9506                 net = chk->whoTo;
9507                 switch (net->ro._l_addr.sa.sa_family) {
9508 #ifdef INET
9509                 case AF_INET:
9510                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9511                         break;
9512 #endif
9513 #ifdef INET6
9514                 case AF_INET6:
9515                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9516                         break;
9517 #endif
9518                 default:
9519                         /* TSNH */
9520                         mtu = net->mtu;
9521                         break;
9522                 }
9523
9524                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9525                         /* No room in peers rwnd */
9526                         uint32_t tsn;
9527
9528                         tsn = asoc->last_acked_seq + 1;
9529                         if (tsn == chk->rec.data.TSN_seq) {
9530                                 /*
9531                                  * we make a special exception for this
9532                                  * case. The peer has no rwnd but is missing
9533                                  * the lowest chunk.. which is probably what
9534                                  * is holding up the rwnd.
9535                                  */
9536                                 goto one_chunk_around;
9537                         }
9538                         return (1);
9539                 }
9540 one_chunk_around:
9541                 if (asoc->peers_rwnd < mtu) {
9542                         one_chunk = 1;
9543                         if ((asoc->peers_rwnd == 0) &&
9544                             (asoc->total_flight == 0)) {
9545                                 chk->window_probe = 1;
9546                                 chk->whoTo->window_probe = 1;
9547                         }
9548                 }
9549 #ifdef SCTP_AUDITING_ENABLED
9550                 sctp_audit_log(0xC3, 2);
9551 #endif
9552                 bundle_at = 0;
9553                 m = NULL;
9554                 net->fast_retran_ip = 0;
9555                 if (chk->rec.data.doing_fast_retransmit == 0) {
9556                         /*
9557                          * if no FR in progress skip destination that have
9558                          * flight_size > cwnd.
9559                          */
9560                         if (net->flight_size >= net->cwnd) {
9561                                 continue;
9562                         }
9563                 } else {
9564                         /*
9565                          * Mark the destination net to have FR recovery
9566                          * limits put on it.
9567                          */
9568                         *fr_done = 1;
9569                         net->fast_retran_ip = 1;
9570                 }
9571
9572                 /*
9573                  * if no AUTH is yet included and this chunk requires it,
9574                  * make sure to account for it.  We don't apply the size
9575                  * until the AUTH chunk is actually added below in case
9576                  * there is no room for this chunk.
9577                  */
9578                 if (data_auth_reqd && (auth == NULL)) {
9579                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9580                 } else
9581                         dmtu = 0;
9582
9583                 if ((chk->send_size <= (mtu - dmtu)) ||
9584                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9585                         /* ok we will add this one */
9586                         if (data_auth_reqd) {
9587                                 if (auth == NULL) {
9588                                         m = sctp_add_auth_chunk(m,
9589                                             &endofchain,
9590                                             &auth,
9591                                             &auth_offset,
9592                                             stcb,
9593                                             SCTP_DATA);
9594                                         auth_keyid = chk->auth_keyid;
9595                                         override_ok = 0;
9596                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9597                                 } else if (override_ok) {
9598                                         auth_keyid = chk->auth_keyid;
9599                                         override_ok = 0;
9600                                 } else if (chk->auth_keyid != auth_keyid) {
9601                                         /* different keyid, so done bundling */
9602                                         break;
9603                                 }
9604                         }
9605                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9606                         if (m == NULL) {
9607                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9608                                 return (ENOMEM);
9609                         }
9610                         /* Do clear IP_DF ? */
9611                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9612                                 no_fragmentflg = 0;
9613                         }
9614                         /* upate our MTU size */
9615                         if (mtu > (chk->send_size + dmtu))
9616                                 mtu -= (chk->send_size + dmtu);
9617                         else
9618                                 mtu = 0;
9619                         data_list[bundle_at++] = chk;
9620                         if (one_chunk && (asoc->total_flight <= 0)) {
9621                                 SCTP_STAT_INCR(sctps_windowprobed);
9622                         }
9623                 }
9624                 if (one_chunk == 0) {
9625                         /*
9626                          * now are there anymore forward from chk to pick
9627                          * up?
9628                          */
9629                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9630                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9631                                         /* Nope, not for retran */
9632                                         continue;
9633                                 }
9634                                 if (fwd->whoTo != net) {
9635                                         /* Nope, not the net in question */
9636                                         continue;
9637                                 }
9638                                 if (data_auth_reqd && (auth == NULL)) {
9639                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9640                                 } else
9641                                         dmtu = 0;
9642                                 if (fwd->send_size <= (mtu - dmtu)) {
9643                                         if (data_auth_reqd) {
9644                                                 if (auth == NULL) {
9645                                                         m = sctp_add_auth_chunk(m,
9646                                                             &endofchain,
9647                                                             &auth,
9648                                                             &auth_offset,
9649                                                             stcb,
9650                                                             SCTP_DATA);
9651                                                         auth_keyid = fwd->auth_keyid;
9652                                                         override_ok = 0;
9653                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9654                                                 } else if (override_ok) {
9655                                                         auth_keyid = fwd->auth_keyid;
9656                                                         override_ok = 0;
9657                                                 } else if (fwd->auth_keyid != auth_keyid) {
9658                                                         /*
9659                                                          * different keyid,
9660                                                          * so done bundling
9661                                                          */
9662                                                         break;
9663                                                 }
9664                                         }
9665                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9666                                         if (m == NULL) {
9667                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9668                                                 return (ENOMEM);
9669                                         }
9670                                         /* Do clear IP_DF ? */
9671                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9672                                                 no_fragmentflg = 0;
9673                                         }
9674                                         /* upate our MTU size */
9675                                         if (mtu > (fwd->send_size + dmtu))
9676                                                 mtu -= (fwd->send_size + dmtu);
9677                                         else
9678                                                 mtu = 0;
9679                                         data_list[bundle_at++] = fwd;
9680                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9681                                                 break;
9682                                         }
9683                                 } else {
9684                                         /* can't fit so we are done */
9685                                         break;
9686                                 }
9687                         }
9688                 }
9689                 /* Is there something to send for this destination? */
9690                 if (m) {
9691                         /*
9692                          * No matter if we fail/or suceed we should start a
9693                          * timer. A failure is like a lost IP packet :-)
9694                          */
9695                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9696                                 /*
9697                                  * no timer running on this destination
9698                                  * restart it.
9699                                  */
9700                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9701                                 tmr_started = 1;
9702                         }
9703                         /* Now lets send it, if there is anything to send :> */
9704                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9705                             (struct sockaddr *)&net->ro._l_addr, m,
9706                             auth_offset, auth, auth_keyid,
9707                             no_fragmentflg, 0, 0,
9708                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9709                             net->port, so_locked, NULL, NULL))) {
9710                                 /* error, we could not output */
9711                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9712                                 return (error);
9713                         }
9714                         endofchain = NULL;
9715                         auth = NULL;
9716                         auth_offset = 0;
9717                         /* For HB's */
9718                         /*
9719                          * We don't want to mark the net->sent time here
9720                          * since this we use this for HB and retrans cannot
9721                          * measure RTT
9722                          */
9723                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9724
9725                         /* For auto-close */
9726                         cnt_thru++;
9727                         if (*now_filled == 0) {
9728                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9729                                 *now = asoc->time_last_sent;
9730                                 *now_filled = 1;
9731                         } else {
9732                                 asoc->time_last_sent = *now;
9733                         }
9734                         *cnt_out += bundle_at;
9735 #ifdef SCTP_AUDITING_ENABLED
9736                         sctp_audit_log(0xC4, bundle_at);
9737 #endif
9738                         if (bundle_at) {
9739                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9740                         }
9741                         for (i = 0; i < bundle_at; i++) {
9742                                 SCTP_STAT_INCR(sctps_sendretransdata);
9743                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9744                                 /*
9745                                  * When we have a revoked data, and we
9746                                  * retransmit it, then we clear the revoked
9747                                  * flag since this flag dictates if we
9748                                  * subtracted from the fs
9749                                  */
9750                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9751                                         /* Deflate the cwnd */
9752                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9753                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9754                                 }
9755                                 data_list[i]->snd_count++;
9756                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9757                                 /* record the time */
9758                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9759                                 if (data_list[i]->book_size_scale) {
9760                                         /*
9761                                          * need to double the book size on
9762                                          * this one
9763                                          */
9764                                         data_list[i]->book_size_scale = 0;
9765                                         /*
9766                                          * Since we double the booksize, we
9767                                          * must also double the output queue
9768                                          * size, since this get shrunk when
9769                                          * we free by this amount.
9770                                          */
9771                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9772                                         data_list[i]->book_size *= 2;
9773
9774
9775                                 } else {
9776                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9777                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9778                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9779                                         }
9780                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9781                                             (uint32_t) (data_list[i]->send_size +
9782                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9783                                 }
9784                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9785                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9786                                             data_list[i]->whoTo->flight_size,
9787                                             data_list[i]->book_size,
9788                                             (uintptr_t) data_list[i]->whoTo,
9789                                             data_list[i]->rec.data.TSN_seq);
9790                                 }
9791                                 sctp_flight_size_increase(data_list[i]);
9792                                 sctp_total_flight_increase(stcb, data_list[i]);
9793                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9794                                         /* SWS sender side engages */
9795                                         asoc->peers_rwnd = 0;
9796                                 }
9797                                 if ((i == 0) &&
9798                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9799                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9800                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9801                                             (tmr_started == 0)) {
9802                                                 /*-
9803                                                  * ok we just fast-retrans'd
9804                                                  * the lowest TSN, i.e the
9805                                                  * first on the list. In
9806                                                  * this case we want to give
9807                                                  * some more time to get a
9808                                                  * SACK back without a
9809                                                  * t3-expiring.
9810                                                  */
9811                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9812                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9813                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9814                                         }
9815                                 }
9816                         }
9817                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9818                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9819                         }
9820 #ifdef SCTP_AUDITING_ENABLED
9821                         sctp_auditing(21, inp, stcb, NULL);
9822 #endif
9823                 } else {
9824                         /* None will fit */
9825                         return (1);
9826                 }
9827                 if (asoc->sent_queue_retran_cnt <= 0) {
9828                         /* all done we have no more to retran */
9829                         asoc->sent_queue_retran_cnt = 0;
9830                         break;
9831                 }
9832                 if (one_chunk) {
9833                         /* No more room in rwnd */
9834                         return (1);
9835                 }
9836                 /* stop the for loop here. we sent out a packet */
9837                 break;
9838         }
9839         return (0);
9840 }
9841
9842 static void
9843 sctp_timer_validation(struct sctp_inpcb *inp,
9844     struct sctp_tcb *stcb,
9845     struct sctp_association *asoc)
9846 {
9847         struct sctp_nets *net;
9848
9849         /* Validate that a timer is running somewhere */
9850         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9851                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9852                         /* Here is a timer */
9853                         return;
9854                 }
9855         }
9856         SCTP_TCB_LOCK_ASSERT(stcb);
9857         /* Gak, we did not have a timer somewhere */
9858         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9859         if (asoc->alternate) {
9860                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9861         } else {
9862                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9863         }
9864         return;
9865 }
9866
9867 void
9868 sctp_chunk_output(struct sctp_inpcb *inp,
9869     struct sctp_tcb *stcb,
9870     int from_where,
9871     int so_locked
9872 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9873     SCTP_UNUSED
9874 #endif
9875 )
9876 {
9877         /*-
9878          * Ok this is the generic chunk service queue. we must do the
9879          * following:
9880          * - See if there are retransmits pending, if so we must
9881          *   do these first.
9882          * - Service the stream queue that is next, moving any
9883          *   message (note I must get a complete message i.e.
9884          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9885          *   TSN's
9886          * - Check to see if the cwnd/rwnd allows any output, if so we
9887          *   go ahead and fomulate and send the low level chunks. Making sure
9888          *   to combine any control in the control chunk queue also.
9889          */
9890         struct sctp_association *asoc;
9891         struct sctp_nets *net;
9892         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9893         unsigned int burst_cnt = 0;
9894         struct timeval now;
9895         int now_filled = 0;
9896         int nagle_on;
9897         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9898         int un_sent = 0;
9899         int fr_done;
9900         unsigned int tot_frs = 0;
9901
9902         asoc = &stcb->asoc;
9903         /* The Nagle algorithm is only applied when handling a send call. */
9904         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9905                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9906                         nagle_on = 0;
9907                 } else {
9908                         nagle_on = 1;
9909                 }
9910         } else {
9911                 nagle_on = 0;
9912         }
9913         SCTP_TCB_LOCK_ASSERT(stcb);
9914
9915         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9916
9917         if ((un_sent <= 0) &&
9918             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9919             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9920             (asoc->sent_queue_retran_cnt == 0)) {
9921                 /* Nothing to do unless there is something to be sent left */
9922                 return;
9923         }
9924         /*
9925          * Do we have something to send, data or control AND a sack timer
9926          * running, if so piggy-back the sack.
9927          */
9928         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9929                 sctp_send_sack(stcb, so_locked);
9930                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9931         }
9932         while (asoc->sent_queue_retran_cnt) {
9933                 /*-
9934                  * Ok, it is retransmission time only, we send out only ONE
9935                  * packet with a single call off to the retran code.
9936                  */
9937                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9938                         /*-
9939                          * Special hook for handling cookiess discarded
9940                          * by peer that carried data. Send cookie-ack only
9941                          * and then the next call with get the retran's.
9942                          */
9943                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9944                             from_where,
9945                             &now, &now_filled, frag_point, so_locked);
9946                         return;
9947                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9948                         /* if its not from a HB then do it */
9949                         fr_done = 0;
9950                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9951                         if (fr_done) {
9952                                 tot_frs++;
9953                         }
9954                 } else {
9955                         /*
9956                          * its from any other place, we don't allow retran
9957                          * output (only control)
9958                          */
9959                         ret = 1;
9960                 }
9961                 if (ret > 0) {
9962                         /* Can't send anymore */
9963                         /*-
9964                          * now lets push out control by calling med-level
9965                          * output once. this assures that we WILL send HB's
9966                          * if queued too.
9967                          */
9968                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9969                             from_where,
9970                             &now, &now_filled, frag_point, so_locked);
9971 #ifdef SCTP_AUDITING_ENABLED
9972                         sctp_auditing(8, inp, stcb, NULL);
9973 #endif
9974                         sctp_timer_validation(inp, stcb, asoc);
9975                         return;
9976                 }
9977                 if (ret < 0) {
9978                         /*-
9979                          * The count was off.. retran is not happening so do
9980                          * the normal retransmission.
9981                          */
9982 #ifdef SCTP_AUDITING_ENABLED
9983                         sctp_auditing(9, inp, stcb, NULL);
9984 #endif
9985                         if (ret == SCTP_RETRAN_EXIT) {
9986                                 return;
9987                         }
9988                         break;
9989                 }
9990                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9991                         /* Only one transmission allowed out of a timeout */
9992 #ifdef SCTP_AUDITING_ENABLED
9993                         sctp_auditing(10, inp, stcb, NULL);
9994 #endif
9995                         /* Push out any control */
9996                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9997                             &now, &now_filled, frag_point, so_locked);
9998                         return;
9999                 }
10000                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10001                         /* Hit FR burst limit */
10002                         return;
10003                 }
10004                 if ((num_out == 0) && (ret == 0)) {
10005                         /* No more retrans to send */
10006                         break;
10007                 }
10008         }
10009 #ifdef SCTP_AUDITING_ENABLED
10010         sctp_auditing(12, inp, stcb, NULL);
10011 #endif
10012         /* Check for bad destinations, if they exist move chunks around. */
10013         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10014                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10015                         /*-
10016                          * if possible move things off of this address we
10017                          * still may send below due to the dormant state but
10018                          * we try to find an alternate address to send to
10019                          * and if we have one we move all queued data on the
10020                          * out wheel to this alternate address.
10021                          */
10022                         if (net->ref_count > 1)
10023                                 sctp_move_chunks_from_net(stcb, net);
10024                 } else {
10025                         /*-
10026                          * if ((asoc->sat_network) || (net->addr_is_local))
10027                          * { burst_limit = asoc->max_burst *
10028                          * SCTP_SAT_NETWORK_BURST_INCR; }
10029                          */
10030                         if (asoc->max_burst > 0) {
10031                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10032                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10033                                                 /*
10034                                                  * JRS - Use the congestion
10035                                                  * control given in the
10036                                                  * congestion control module
10037                                                  */
10038                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10039                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10040                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10041                                                 }
10042                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10043                                         }
10044                                         net->fast_retran_ip = 0;
10045                                 } else {
10046                                         if (net->flight_size == 0) {
10047                                                 /*
10048                                                  * Should be decaying the
10049                                                  * cwnd here
10050                                                  */
10051                                                 ;
10052                                         }
10053                                 }
10054                         }
10055                 }
10056
10057         }
10058         burst_cnt = 0;
10059         do {
10060                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10061                     &reason_code, 0, from_where,
10062                     &now, &now_filled, frag_point, so_locked);
10063                 if (error) {
10064                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10065                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10066                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10067                         }
10068                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10069                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10070                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10071                         }
10072                         break;
10073                 }
10074                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10075
10076                 tot_out += num_out;
10077                 burst_cnt++;
10078                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10079                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10080                         if (num_out == 0) {
10081                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10082                         }
10083                 }
10084                 if (nagle_on) {
10085                         /*
10086                          * When the Nagle algorithm is used, look at how
10087                          * much is unsent, then if its smaller than an MTU
10088                          * and we have data in flight we stop, except if we
10089                          * are handling a fragmented user message.
10090                          */
10091                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10092                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10093                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10094                             (stcb->asoc.total_flight > 0) &&
10095                             ((stcb->asoc.locked_on_sending == NULL) ||
10096                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10097                                 break;
10098                         }
10099                 }
10100                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10101                     TAILQ_EMPTY(&asoc->send_queue) &&
10102                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10103                         /* Nothing left to send */
10104                         break;
10105                 }
10106                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10107                         /* Nothing left to send */
10108                         break;
10109                 }
10110         } while (num_out &&
10111             ((asoc->max_burst == 0) ||
10112             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10113             (burst_cnt < asoc->max_burst)));
10114
10115         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10116                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10117                         SCTP_STAT_INCR(sctps_maxburstqueued);
10118                         asoc->burst_limit_applied = 1;
10119                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10120                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10121                         }
10122                 } else {
10123                         asoc->burst_limit_applied = 0;
10124                 }
10125         }
10126         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10127                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10128         }
10129         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10130             tot_out);
10131
10132         /*-
10133          * Now we need to clean up the control chunk chain if a ECNE is on
10134          * it. It must be marked as UNSENT again so next call will continue
10135          * to send it until such time that we get a CWR, to remove it.
10136          */
10137         if (stcb->asoc.ecn_echo_cnt_onq)
10138                 sctp_fix_ecn_echo(asoc);
10139         return;
10140 }
10141
10142
10143 int
10144 sctp_output(
10145     struct sctp_inpcb *inp,
10146     struct mbuf *m,
10147     struct sockaddr *addr,
10148     struct mbuf *control,
10149     struct thread *p,
10150     int flags)
10151 {
10152         if (inp == NULL) {
10153                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10154                 return (EINVAL);
10155         }
10156         if (inp->sctp_socket == NULL) {
10157                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10158                 return (EINVAL);
10159         }
10160         return (sctp_sosend(inp->sctp_socket,
10161             addr,
10162             (struct uio *)NULL,
10163             m,
10164             control,
10165             flags, p
10166             ));
10167 }
10168
10169 void
10170 send_forward_tsn(struct sctp_tcb *stcb,
10171     struct sctp_association *asoc)
10172 {
10173         struct sctp_tmit_chunk *chk;
10174         struct sctp_forward_tsn_chunk *fwdtsn;
10175         uint32_t advance_peer_ack_point;
10176
10177         SCTP_TCB_LOCK_ASSERT(stcb);
10178         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10179                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10180                         /* mark it to unsent */
10181                         chk->sent = SCTP_DATAGRAM_UNSENT;
10182                         chk->snd_count = 0;
10183                         /* Do we correct its output location? */
10184                         if (chk->whoTo) {
10185                                 sctp_free_remote_addr(chk->whoTo);
10186                                 chk->whoTo = NULL;
10187                         }
10188                         goto sctp_fill_in_rest;
10189                 }
10190         }
10191         /* Ok if we reach here we must build one */
10192         sctp_alloc_a_chunk(stcb, chk);
10193         if (chk == NULL) {
10194                 return;
10195         }
10196         asoc->fwd_tsn_cnt++;
10197         chk->copy_by_ref = 0;
10198         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10199         chk->rec.chunk_id.can_take_data = 0;
10200         chk->asoc = asoc;
10201         chk->whoTo = NULL;
10202         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10203         if (chk->data == NULL) {
10204                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10205                 return;
10206         }
10207         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10208         chk->sent = SCTP_DATAGRAM_UNSENT;
10209         chk->snd_count = 0;
10210         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10211         asoc->ctrl_queue_cnt++;
10212 sctp_fill_in_rest:
10213         /*-
10214          * Here we go through and fill out the part that deals with
10215          * stream/seq of the ones we skip.
10216          */
10217         SCTP_BUF_LEN(chk->data) = 0;
10218         {
10219                 struct sctp_tmit_chunk *at, *tp1, *last;
10220                 struct sctp_strseq *strseq;
10221                 unsigned int cnt_of_space, i, ovh;
10222                 unsigned int space_needed;
10223                 unsigned int cnt_of_skipped = 0;
10224
10225                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10226                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10227                                 /* no more to look at */
10228                                 break;
10229                         }
10230                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10231                                 /* We don't report these */
10232                                 continue;
10233                         }
10234                         cnt_of_skipped++;
10235                 }
10236                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10237                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10238
10239                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10240
10241                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10242                         ovh = SCTP_MIN_OVERHEAD;
10243                 } else {
10244                         ovh = SCTP_MIN_V4_OVERHEAD;
10245                 }
10246                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10247                         /* trim to a mtu size */
10248                         cnt_of_space = asoc->smallest_mtu - ovh;
10249                 }
10250                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10251                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10252                             0xff, 0, cnt_of_skipped,
10253                             asoc->advanced_peer_ack_point);
10254
10255                 }
10256                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10257                 if (cnt_of_space < space_needed) {
10258                         /*-
10259                          * ok we must trim down the chunk by lowering the
10260                          * advance peer ack point.
10261                          */
10262                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10263                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10264                                     0xff, 0xff, cnt_of_space,
10265                                     space_needed);
10266                         }
10267                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10268                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10269                         /*-
10270                          * Go through and find the TSN that will be the one
10271                          * we report.
10272                          */
10273                         at = TAILQ_FIRST(&asoc->sent_queue);
10274                         if (at != NULL) {
10275                                 for (i = 0; i < cnt_of_skipped; i++) {
10276                                         tp1 = TAILQ_NEXT(at, sctp_next);
10277                                         if (tp1 == NULL) {
10278                                                 break;
10279                                         }
10280                                         at = tp1;
10281                                 }
10282                         }
10283                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10284                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10285                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10286                                     asoc->advanced_peer_ack_point);
10287                         }
10288                         last = at;
10289                         /*-
10290                          * last now points to last one I can report, update
10291                          * peer ack point
10292                          */
10293                         if (last)
10294                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10295                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10296                             cnt_of_skipped * sizeof(struct sctp_strseq);
10297                 }
10298                 chk->send_size = space_needed;
10299                 /* Setup the chunk */
10300                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10301                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10302                 fwdtsn->ch.chunk_flags = 0;
10303                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10304                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10305                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10306                 fwdtsn++;
10307                 /*-
10308                  * Move pointer to after the fwdtsn and transfer to the
10309                  * strseq pointer.
10310                  */
10311                 strseq = (struct sctp_strseq *)fwdtsn;
10312                 /*-
10313                  * Now populate the strseq list. This is done blindly
10314                  * without pulling out duplicate stream info. This is
10315                  * inefficent but won't harm the process since the peer will
10316                  * look at these in sequence and will thus release anything.
10317                  * It could mean we exceed the PMTU and chop off some that
10318                  * we could have included.. but this is unlikely (aka 1432/4
10319                  * would mean 300+ stream seq's would have to be reported in
10320                  * one FWD-TSN. With a bit of work we can later FIX this to
10321                  * optimize and pull out duplcates.. but it does add more
10322                  * overhead. So for now... not!
10323                  */
10324                 at = TAILQ_FIRST(&asoc->sent_queue);
10325                 for (i = 0; i < cnt_of_skipped; i++) {
10326                         tp1 = TAILQ_NEXT(at, sctp_next);
10327                         if (tp1 == NULL)
10328                                 break;
10329                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10330                                 /* We don't report these */
10331                                 i--;
10332                                 at = tp1;
10333                                 continue;
10334                         }
10335                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10336                                 at->rec.data.fwd_tsn_cnt = 0;
10337                         }
10338                         strseq->stream = ntohs(at->rec.data.stream_number);
10339                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10340                         strseq++;
10341                         at = tp1;
10342                 }
10343         }
10344         return;
10345 }
10346
10347 void
10348 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10349 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10350     SCTP_UNUSED
10351 #endif
10352 )
10353 {
10354         /*-
10355          * Queue up a SACK or NR-SACK in the control queue.
10356          * We must first check to see if a SACK or NR-SACK is
10357          * somehow on the control queue.
10358          * If so, we will take and and remove the old one.
10359          */
10360         struct sctp_association *asoc;
10361         struct sctp_tmit_chunk *chk, *a_chk;
10362         struct sctp_sack_chunk *sack;
10363         struct sctp_nr_sack_chunk *nr_sack;
10364         struct sctp_gap_ack_block *gap_descriptor;
10365         struct sack_track *selector;
10366         int mergeable = 0;
10367         int offset;
10368         caddr_t limit;
10369         uint32_t *dup;
10370         int limit_reached = 0;
10371         unsigned int i, siz, j;
10372         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10373         int num_dups = 0;
10374         int space_req;
10375         uint32_t highest_tsn;
10376         uint8_t flags;
10377         uint8_t type;
10378         uint8_t tsn_map;
10379
10380         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10381             (stcb->asoc.peer_supports_nr_sack == 1)) {
10382                 type = SCTP_NR_SELECTIVE_ACK;
10383         } else {
10384                 type = SCTP_SELECTIVE_ACK;
10385         }
10386         a_chk = NULL;
10387         asoc = &stcb->asoc;
10388         SCTP_TCB_LOCK_ASSERT(stcb);
10389         if (asoc->last_data_chunk_from == NULL) {
10390                 /* Hmm we never received anything */
10391                 return;
10392         }
10393         sctp_slide_mapping_arrays(stcb);
10394         sctp_set_rwnd(stcb, asoc);
10395         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10396                 if (chk->rec.chunk_id.id == type) {
10397                         /* Hmm, found a sack already on queue, remove it */
10398                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10399                         asoc->ctrl_queue_cnt--;
10400                         a_chk = chk;
10401                         if (a_chk->data) {
10402                                 sctp_m_freem(a_chk->data);
10403                                 a_chk->data = NULL;
10404                         }
10405                         if (a_chk->whoTo) {
10406                                 sctp_free_remote_addr(a_chk->whoTo);
10407                                 a_chk->whoTo = NULL;
10408                         }
10409                         break;
10410                 }
10411         }
10412         if (a_chk == NULL) {
10413                 sctp_alloc_a_chunk(stcb, a_chk);
10414                 if (a_chk == NULL) {
10415                         /* No memory so we drop the idea, and set a timer */
10416                         if (stcb->asoc.delayed_ack) {
10417                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10418                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10419                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10420                                     stcb->sctp_ep, stcb, NULL);
10421                         } else {
10422                                 stcb->asoc.send_sack = 1;
10423                         }
10424                         return;
10425                 }
10426                 a_chk->copy_by_ref = 0;
10427                 a_chk->rec.chunk_id.id = type;
10428                 a_chk->rec.chunk_id.can_take_data = 1;
10429         }
10430         /* Clear our pkt counts */
10431         asoc->data_pkts_seen = 0;
10432
10433         a_chk->asoc = asoc;
10434         a_chk->snd_count = 0;
10435         a_chk->send_size = 0;   /* fill in later */
10436         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10437         a_chk->whoTo = NULL;
10438
10439         if ((asoc->numduptsns) ||
10440             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10441                 /*-
10442                  * Ok, we have some duplicates or the destination for the
10443                  * sack is unreachable, lets see if we can select an
10444                  * alternate than asoc->last_data_chunk_from
10445                  */
10446                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10447                     (asoc->used_alt_onsack > asoc->numnets)) {
10448                         /* We used an alt last time, don't this time */
10449                         a_chk->whoTo = NULL;
10450                 } else {
10451                         asoc->used_alt_onsack++;
10452                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10453                 }
10454                 if (a_chk->whoTo == NULL) {
10455                         /* Nope, no alternate */
10456                         a_chk->whoTo = asoc->last_data_chunk_from;
10457                         asoc->used_alt_onsack = 0;
10458                 }
10459         } else {
10460                 /*
10461                  * No duplicates so we use the last place we received data
10462                  * from.
10463                  */
10464                 asoc->used_alt_onsack = 0;
10465                 a_chk->whoTo = asoc->last_data_chunk_from;
10466         }
10467         if (a_chk->whoTo) {
10468                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10469         }
10470         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10471                 highest_tsn = asoc->highest_tsn_inside_map;
10472         } else {
10473                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10474         }
10475         if (highest_tsn == asoc->cumulative_tsn) {
10476                 /* no gaps */
10477                 if (type == SCTP_SELECTIVE_ACK) {
10478                         space_req = sizeof(struct sctp_sack_chunk);
10479                 } else {
10480                         space_req = sizeof(struct sctp_nr_sack_chunk);
10481                 }
10482         } else {
10483                 /* gaps get a cluster */
10484                 space_req = MCLBYTES;
10485         }
10486         /* Ok now lets formulate a MBUF with our sack */
10487         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10488         if ((a_chk->data == NULL) ||
10489             (a_chk->whoTo == NULL)) {
10490                 /* rats, no mbuf memory */
10491                 if (a_chk->data) {
10492                         /* was a problem with the destination */
10493                         sctp_m_freem(a_chk->data);
10494                         a_chk->data = NULL;
10495                 }
10496                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10497                 /* sa_ignore NO_NULL_CHK */
10498                 if (stcb->asoc.delayed_ack) {
10499                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10500                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10501                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10502                             stcb->sctp_ep, stcb, NULL);
10503                 } else {
10504                         stcb->asoc.send_sack = 1;
10505                 }
10506                 return;
10507         }
10508         /* ok, lets go through and fill it in */
10509         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10510         space = M_TRAILINGSPACE(a_chk->data);
10511         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10512                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10513         }
10514         limit = mtod(a_chk->data, caddr_t);
10515         limit += space;
10516
10517         flags = 0;
10518
10519         if ((asoc->sctp_cmt_on_off > 0) &&
10520             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10521                 /*-
10522                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10523                  * received, then set high bit to 1, else 0. Reset
10524                  * pkts_rcvd.
10525                  */
10526                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10527                 asoc->cmt_dac_pkts_rcvd = 0;
10528         }
10529 #ifdef SCTP_ASOCLOG_OF_TSNS
10530         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10531         stcb->asoc.cumack_log_atsnt++;
10532         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10533                 stcb->asoc.cumack_log_atsnt = 0;
10534         }
10535 #endif
10536         /* reset the readers interpretation */
10537         stcb->freed_by_sorcv_sincelast = 0;
10538
10539         if (type == SCTP_SELECTIVE_ACK) {
10540                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10541                 nr_sack = NULL;
10542                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10543                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10544                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10545                 } else {
10546                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10547                 }
10548         } else {
10549                 sack = NULL;
10550                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10551                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10552                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10553                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10554                 } else {
10555                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10556                 }
10557         }
10558
10559         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10560                 offset = 1;
10561         } else {
10562                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10563         }
10564         if (((type == SCTP_SELECTIVE_ACK) &&
10565             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10566             ((type == SCTP_NR_SELECTIVE_ACK) &&
10567             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10568                 /* we have a gap .. maybe */
10569                 for (i = 0; i < siz; i++) {
10570                         tsn_map = asoc->mapping_array[i];
10571                         if (type == SCTP_SELECTIVE_ACK) {
10572                                 tsn_map |= asoc->nr_mapping_array[i];
10573                         }
10574                         if (i == 0) {
10575                                 /*
10576                                  * Clear all bits corresponding to TSNs
10577                                  * smaller or equal to the cumulative TSN.
10578                                  */
10579                                 tsn_map &= (~0 << (1 - offset));
10580                         }
10581                         selector = &sack_array[tsn_map];
10582                         if (mergeable && selector->right_edge) {
10583                                 /*
10584                                  * Backup, left and right edges were ok to
10585                                  * merge.
10586                                  */
10587                                 num_gap_blocks--;
10588                                 gap_descriptor--;
10589                         }
10590                         if (selector->num_entries == 0)
10591                                 mergeable = 0;
10592                         else {
10593                                 for (j = 0; j < selector->num_entries; j++) {
10594                                         if (mergeable && selector->right_edge) {
10595                                                 /*
10596                                                  * do a merge by NOT setting
10597                                                  * the left side
10598                                                  */
10599                                                 mergeable = 0;
10600                                         } else {
10601                                                 /*
10602                                                  * no merge, set the left
10603                                                  * side
10604                                                  */
10605                                                 mergeable = 0;
10606                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10607                                         }
10608                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10609                                         num_gap_blocks++;
10610                                         gap_descriptor++;
10611                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10612                                                 /* no more room */
10613                                                 limit_reached = 1;
10614                                                 break;
10615                                         }
10616                                 }
10617                                 if (selector->left_edge) {
10618                                         mergeable = 1;
10619                                 }
10620                         }
10621                         if (limit_reached) {
10622                                 /* Reached the limit stop */
10623                                 break;
10624                         }
10625                         offset += 8;
10626                 }
10627         }
10628         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10629             (limit_reached == 0)) {
10630
10631                 mergeable = 0;
10632
10633                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10634                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10635                 } else {
10636                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10637                 }
10638
10639                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10640                         offset = 1;
10641                 } else {
10642                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10643                 }
10644                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10645                         /* we have a gap .. maybe */
10646                         for (i = 0; i < siz; i++) {
10647                                 tsn_map = asoc->nr_mapping_array[i];
10648                                 if (i == 0) {
10649                                         /*
10650                                          * Clear all bits corresponding to
10651                                          * TSNs smaller or equal to the
10652                                          * cumulative TSN.
10653                                          */
10654                                         tsn_map &= (~0 << (1 - offset));
10655                                 }
10656                                 selector = &sack_array[tsn_map];
10657                                 if (mergeable && selector->right_edge) {
10658                                         /*
10659                                          * Backup, left and right edges were
10660                                          * ok to merge.
10661                                          */
10662                                         num_nr_gap_blocks--;
10663                                         gap_descriptor--;
10664                                 }
10665                                 if (selector->num_entries == 0)
10666                                         mergeable = 0;
10667                                 else {
10668                                         for (j = 0; j < selector->num_entries; j++) {
10669                                                 if (mergeable && selector->right_edge) {
10670                                                         /*
10671                                                          * do a merge by NOT
10672                                                          * setting the left
10673                                                          * side
10674                                                          */
10675                                                         mergeable = 0;
10676                                                 } else {
10677                                                         /*
10678                                                          * no merge, set the
10679                                                          * left side
10680                                                          */
10681                                                         mergeable = 0;
10682                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10683                                                 }
10684                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10685                                                 num_nr_gap_blocks++;
10686                                                 gap_descriptor++;
10687                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10688                                                         /* no more room */
10689                                                         limit_reached = 1;
10690                                                         break;
10691                                                 }
10692                                         }
10693                                         if (selector->left_edge) {
10694                                                 mergeable = 1;
10695                                         }
10696                                 }
10697                                 if (limit_reached) {
10698                                         /* Reached the limit stop */
10699                                         break;
10700                                 }
10701                                 offset += 8;
10702                         }
10703                 }
10704         }
10705         /* now we must add any dups we are going to report. */
10706         if ((limit_reached == 0) && (asoc->numduptsns)) {
10707                 dup = (uint32_t *) gap_descriptor;
10708                 for (i = 0; i < asoc->numduptsns; i++) {
10709                         *dup = htonl(asoc->dup_tsns[i]);
10710                         dup++;
10711                         num_dups++;
10712                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10713                                 /* no more room */
10714                                 break;
10715                         }
10716                 }
10717                 asoc->numduptsns = 0;
10718         }
10719         /*
10720          * now that the chunk is prepared queue it to the control chunk
10721          * queue.
10722          */
10723         if (type == SCTP_SELECTIVE_ACK) {
10724                 a_chk->send_size = sizeof(struct sctp_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                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10729                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10730                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10731                 sack->sack.num_dup_tsns = htons(num_dups);
10732                 sack->ch.chunk_type = type;
10733                 sack->ch.chunk_flags = flags;
10734                 sack->ch.chunk_length = htons(a_chk->send_size);
10735         } else {
10736                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10737                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10738                     num_dups * sizeof(int32_t);
10739                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10740                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10741                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10742                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10743                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10744                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10745                 nr_sack->nr_sack.reserved = 0;
10746                 nr_sack->ch.chunk_type = type;
10747                 nr_sack->ch.chunk_flags = flags;
10748                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10749         }
10750         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10751         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10752         asoc->ctrl_queue_cnt++;
10753         asoc->send_sack = 0;
10754         SCTP_STAT_INCR(sctps_sendsacks);
10755         return;
10756 }
10757
10758 void
10759 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10760 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10761     SCTP_UNUSED
10762 #endif
10763 )
10764 {
10765         struct mbuf *m_abort;
10766         struct mbuf *m_out = NULL, *m_end = NULL;
10767         struct sctp_abort_chunk *abort = NULL;
10768         int sz;
10769         uint32_t auth_offset = 0;
10770         struct sctp_auth_chunk *auth = NULL;
10771         struct sctp_nets *net;
10772
10773         /*-
10774          * Add an AUTH chunk, if chunk requires it and save the offset into
10775          * the chain for AUTH
10776          */
10777         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10778             stcb->asoc.peer_auth_chunks)) {
10779                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10780                     stcb, SCTP_ABORT_ASSOCIATION);
10781                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10782         }
10783         SCTP_TCB_LOCK_ASSERT(stcb);
10784         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10785         if (m_abort == NULL) {
10786                 /* no mbuf's */
10787                 if (m_out)
10788                         sctp_m_freem(m_out);
10789                 return;
10790         }
10791         /* link in any error */
10792         SCTP_BUF_NEXT(m_abort) = operr;
10793         sz = 0;
10794         if (operr) {
10795                 struct mbuf *n;
10796
10797                 n = operr;
10798                 while (n) {
10799                         sz += SCTP_BUF_LEN(n);
10800                         n = SCTP_BUF_NEXT(n);
10801                 }
10802         }
10803         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10804         if (m_out == NULL) {
10805                 /* NO Auth chunk prepended, so reserve space in front */
10806                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10807                 m_out = m_abort;
10808         } else {
10809                 /* Put AUTH chunk at the front of the chain */
10810                 SCTP_BUF_NEXT(m_end) = m_abort;
10811         }
10812         if (stcb->asoc.alternate) {
10813                 net = stcb->asoc.alternate;
10814         } else {
10815                 net = stcb->asoc.primary_destination;
10816         }
10817         /* fill in the ABORT chunk */
10818         abort = mtod(m_abort, struct sctp_abort_chunk *);
10819         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10820         abort->ch.chunk_flags = 0;
10821         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10822
10823         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10824             (struct sockaddr *)&net->ro._l_addr,
10825             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10826             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10827             stcb->asoc.primary_destination->port, so_locked, NULL, NULL);
10828         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10829 }
10830
10831 void
10832 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10833     struct sctp_nets *net,
10834     int reflect_vtag)
10835 {
10836         /* formulate and SEND a SHUTDOWN-COMPLETE */
10837         struct mbuf *m_shutdown_comp;
10838         struct sctp_shutdown_complete_chunk *shutdown_complete;
10839         uint32_t vtag;
10840         uint8_t flags;
10841
10842         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10843         if (m_shutdown_comp == NULL) {
10844                 /* no mbuf's */
10845                 return;
10846         }
10847         if (reflect_vtag) {
10848                 flags = SCTP_HAD_NO_TCB;
10849                 vtag = stcb->asoc.my_vtag;
10850         } else {
10851                 flags = 0;
10852                 vtag = stcb->asoc.peer_vtag;
10853         }
10854         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10855         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10856         shutdown_complete->ch.chunk_flags = flags;
10857         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10858         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10859         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10860             (struct sockaddr *)&net->ro._l_addr,
10861             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10862             stcb->sctp_ep->sctp_lport, stcb->rport,
10863             htonl(vtag),
10864             net->port, SCTP_SO_NOT_LOCKED, NULL, NULL);
10865         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10866         return;
10867 }
10868
10869 void
10870 sctp_send_shutdown_complete2(struct mbuf *m, struct sctphdr *sh,
10871     uint32_t vrf_id, uint16_t port)
10872 {
10873         /* formulate and SEND a SHUTDOWN-COMPLETE */
10874         struct mbuf *o_pak;
10875         struct mbuf *mout;
10876         struct ip *iph;
10877         struct udphdr *udp = NULL;
10878         int offset_out, len, mlen;
10879         struct sctp_shutdown_complete_msg *comp_cp;
10880
10881 #ifdef INET
10882         struct ip *iph_out;
10883
10884 #endif
10885 #ifdef INET6
10886         struct ip6_hdr *ip6, *ip6_out;
10887
10888 #endif
10889
10890         iph = mtod(m, struct ip *);
10891         switch (iph->ip_v) {
10892 #ifdef INET
10893         case IPVERSION:
10894                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
10895                 break;
10896 #endif
10897 #ifdef INET6
10898         case IPV6_VERSION >> 4:
10899                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
10900                 break;
10901 #endif
10902         default:
10903                 return;
10904         }
10905         if (port) {
10906                 len += sizeof(struct udphdr);
10907         }
10908         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10909         if (mout == NULL) {
10910                 return;
10911         }
10912         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10913         SCTP_BUF_LEN(mout) = len;
10914         SCTP_BUF_NEXT(mout) = NULL;
10915         if (m->m_flags & M_FLOWID) {
10916                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
10917                 mout->m_flags |= M_FLOWID;
10918         }
10919 #ifdef INET
10920         iph_out = NULL;
10921 #endif
10922 #ifdef INET6
10923         ip6_out = NULL;
10924 #endif
10925         offset_out = 0;
10926
10927         switch (iph->ip_v) {
10928 #ifdef INET
10929         case IPVERSION:
10930                 iph_out = mtod(mout, struct ip *);
10931
10932                 /* Fill in the IP header for the ABORT */
10933                 iph_out->ip_v = IPVERSION;
10934                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10935                 iph_out->ip_tos = (u_char)0;
10936                 iph_out->ip_id = 0;
10937                 iph_out->ip_off = 0;
10938                 iph_out->ip_ttl = MAXTTL;
10939                 if (port) {
10940                         iph_out->ip_p = IPPROTO_UDP;
10941                 } else {
10942                         iph_out->ip_p = IPPROTO_SCTP;
10943                 }
10944                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10945                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10946
10947                 /* let IP layer calculate this */
10948                 iph_out->ip_sum = 0;
10949                 offset_out += sizeof(*iph_out);
10950                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10951                     (caddr_t)iph_out + offset_out);
10952                 break;
10953 #endif
10954 #ifdef INET6
10955         case IPV6_VERSION >> 4:
10956                 ip6 = (struct ip6_hdr *)iph;
10957                 ip6_out = mtod(mout, struct ip6_hdr *);
10958
10959                 /* Fill in the IPv6 header for the ABORT */
10960                 ip6_out->ip6_flow = ip6->ip6_flow;
10961                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10962                 if (port) {
10963                         ip6_out->ip6_nxt = IPPROTO_UDP;
10964                 } else {
10965                         ip6_out->ip6_nxt = IPPROTO_SCTP;
10966                 }
10967                 ip6_out->ip6_src = ip6->ip6_dst;
10968                 ip6_out->ip6_dst = ip6->ip6_src;
10969                 /*
10970                  * ?? The old code had both the iph len + payload, I think
10971                  * this is wrong and would never have worked
10972                  */
10973                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
10974                 offset_out += sizeof(*ip6_out);
10975                 comp_cp = (struct sctp_shutdown_complete_msg *)(
10976                     (caddr_t)ip6_out + offset_out);
10977                 break;
10978 #endif                          /* INET6 */
10979         default:
10980                 /* Currently not supported. */
10981                 sctp_m_freem(mout);
10982                 return;
10983         }
10984         if (port) {
10985                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10986                         sctp_m_freem(mout);
10987                         return;
10988                 }
10989                 udp = (struct udphdr *)comp_cp;
10990                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10991                 udp->uh_dport = port;
10992                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
10993 #ifdef INET
10994                 if (iph_out) {
10995                         if (V_udp_cksum) {
10996                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10997                         } else {
10998                                 udp->uh_sum = 0;
10999                         }
11000                 }
11001 #endif
11002                 offset_out += sizeof(struct udphdr);
11003                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
11004         }
11005         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11006                 /* no mbuf's */
11007                 sctp_m_freem(mout);
11008                 return;
11009         }
11010         /* Now copy in and fill in the ABORT tags etc. */
11011         comp_cp->sh.src_port = sh->dest_port;
11012         comp_cp->sh.dest_port = sh->src_port;
11013         comp_cp->sh.checksum = 0;
11014         comp_cp->sh.v_tag = sh->v_tag;
11015         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
11016         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11017         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11018
11019 #ifdef INET
11020         if (iph_out != NULL) {
11021                 sctp_route_t ro;
11022                 int ret;
11023
11024                 mlen = SCTP_BUF_LEN(mout);
11025                 bzero(&ro, sizeof ro);
11026                 /* set IPv4 length */
11027                 iph_out->ip_len = mlen;
11028 #ifdef  SCTP_PACKET_LOGGING
11029                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11030                         sctp_packet_log(mout, mlen);
11031 #endif
11032                 if (port) {
11033 #if defined(SCTP_WITH_NO_CSUM)
11034                         SCTP_STAT_INCR(sctps_sendnocrc);
11035 #else
11036                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, offset_out);
11037                         SCTP_STAT_INCR(sctps_sendswcrc);
11038 #endif
11039                         if (V_udp_cksum) {
11040                                 SCTP_ENABLE_UDP_CSUM(mout);
11041                         }
11042                 } else {
11043 #if defined(SCTP_WITH_NO_CSUM)
11044                         SCTP_STAT_INCR(sctps_sendnocrc);
11045 #else
11046                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11047                         mout->m_pkthdr.csum_data = 0;
11048                         SCTP_STAT_INCR(sctps_sendhwcrc);
11049 #endif
11050                 }
11051                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11052                 /* out it goes */
11053                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11054
11055                 /* Free the route if we got one back */
11056                 if (ro.ro_rt)
11057                         RTFREE(ro.ro_rt);
11058         }
11059 #endif
11060 #ifdef INET6
11061         if (ip6_out != NULL) {
11062                 struct route_in6 ro;
11063                 int ret;
11064                 struct ifnet *ifp = NULL;
11065
11066                 bzero(&ro, sizeof(ro));
11067                 mlen = SCTP_BUF_LEN(mout);
11068 #ifdef  SCTP_PACKET_LOGGING
11069                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
11070                         sctp_packet_log(mout, mlen);
11071 #endif
11072                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
11073                 if (port) {
11074 #if defined(SCTP_WITH_NO_CSUM)
11075                         SCTP_STAT_INCR(sctps_sendnocrc);
11076 #else
11077                         comp_cp->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11078                         SCTP_STAT_INCR(sctps_sendswcrc);
11079 #endif
11080                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), mlen - sizeof(struct ip6_hdr))) == 0) {
11081                                 udp->uh_sum = 0xffff;
11082                         }
11083                 } else {
11084 #if defined(SCTP_WITH_NO_CSUM)
11085                         SCTP_STAT_INCR(sctps_sendnocrc);
11086 #else
11087                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11088                         mout->m_pkthdr.csum_data = 0;
11089                         SCTP_STAT_INCR(sctps_sendhwcrc);
11090 #endif
11091                 }
11092                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
11093
11094                 /* Free the route if we got one back */
11095                 if (ro.ro_rt)
11096                         RTFREE(ro.ro_rt);
11097         }
11098 #endif
11099         SCTP_STAT_INCR(sctps_sendpackets);
11100         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11101         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11102         return;
11103
11104 }
11105
11106 void
11107 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11108 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11109     SCTP_UNUSED
11110 #endif
11111 )
11112 {
11113         struct sctp_tmit_chunk *chk;
11114         struct sctp_heartbeat_chunk *hb;
11115         struct timeval now;
11116
11117         SCTP_TCB_LOCK_ASSERT(stcb);
11118         if (net == NULL) {
11119                 return;
11120         }
11121         (void)SCTP_GETTIME_TIMEVAL(&now);
11122         switch (net->ro._l_addr.sa.sa_family) {
11123 #ifdef INET
11124         case AF_INET:
11125                 break;
11126 #endif
11127 #ifdef INET6
11128         case AF_INET6:
11129                 break;
11130 #endif
11131         default:
11132                 return;
11133         }
11134         sctp_alloc_a_chunk(stcb, chk);
11135         if (chk == NULL) {
11136                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11137                 return;
11138         }
11139         chk->copy_by_ref = 0;
11140         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11141         chk->rec.chunk_id.can_take_data = 1;
11142         chk->asoc = &stcb->asoc;
11143         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11144
11145         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11146         if (chk->data == NULL) {
11147                 sctp_free_a_chunk(stcb, chk, so_locked);
11148                 return;
11149         }
11150         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11151         SCTP_BUF_LEN(chk->data) = chk->send_size;
11152         chk->sent = SCTP_DATAGRAM_UNSENT;
11153         chk->snd_count = 0;
11154         chk->whoTo = net;
11155         atomic_add_int(&chk->whoTo->ref_count, 1);
11156         /* Now we have a mbuf that we can fill in with the details */
11157         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11158         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11159         /* fill out chunk header */
11160         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11161         hb->ch.chunk_flags = 0;
11162         hb->ch.chunk_length = htons(chk->send_size);
11163         /* Fill out hb parameter */
11164         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11165         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11166         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11167         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11168         /* Did our user request this one, put it in */
11169         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11170         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11171         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11172                 /*
11173                  * we only take from the entropy pool if the address is not
11174                  * confirmed.
11175                  */
11176                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11177                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11178         } else {
11179                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11180                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11181         }
11182         switch (net->ro._l_addr.sa.sa_family) {
11183 #ifdef INET
11184         case AF_INET:
11185                 memcpy(hb->heartbeat.hb_info.address,
11186                     &net->ro._l_addr.sin.sin_addr,
11187                     sizeof(net->ro._l_addr.sin.sin_addr));
11188                 break;
11189 #endif
11190 #ifdef INET6
11191         case AF_INET6:
11192                 memcpy(hb->heartbeat.hb_info.address,
11193                     &net->ro._l_addr.sin6.sin6_addr,
11194                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11195                 break;
11196 #endif
11197         default:
11198                 return;
11199                 break;
11200         }
11201         net->hb_responded = 0;
11202         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11203         stcb->asoc.ctrl_queue_cnt++;
11204         SCTP_STAT_INCR(sctps_sendheartbeat);
11205         return;
11206 }
11207
11208 void
11209 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11210     uint32_t high_tsn)
11211 {
11212         struct sctp_association *asoc;
11213         struct sctp_ecne_chunk *ecne;
11214         struct sctp_tmit_chunk *chk;
11215
11216         if (net == NULL) {
11217                 return;
11218         }
11219         asoc = &stcb->asoc;
11220         SCTP_TCB_LOCK_ASSERT(stcb);
11221         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11222                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11223                         /* found a previous ECN_ECHO update it if needed */
11224                         uint32_t cnt, ctsn;
11225
11226                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11227                         ctsn = ntohl(ecne->tsn);
11228                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11229                                 ecne->tsn = htonl(high_tsn);
11230                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11231                         }
11232                         cnt = ntohl(ecne->num_pkts_since_cwr);
11233                         cnt++;
11234                         ecne->num_pkts_since_cwr = htonl(cnt);
11235                         return;
11236                 }
11237         }
11238         /* nope could not find one to update so we must build one */
11239         sctp_alloc_a_chunk(stcb, chk);
11240         if (chk == NULL) {
11241                 return;
11242         }
11243         chk->copy_by_ref = 0;
11244         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11245         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11246         chk->rec.chunk_id.can_take_data = 0;
11247         chk->asoc = &stcb->asoc;
11248         chk->send_size = sizeof(struct sctp_ecne_chunk);
11249         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11250         if (chk->data == NULL) {
11251                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11252                 return;
11253         }
11254         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11255         SCTP_BUF_LEN(chk->data) = chk->send_size;
11256         chk->sent = SCTP_DATAGRAM_UNSENT;
11257         chk->snd_count = 0;
11258         chk->whoTo = net;
11259         atomic_add_int(&chk->whoTo->ref_count, 1);
11260
11261         stcb->asoc.ecn_echo_cnt_onq++;
11262         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11263         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11264         ecne->ch.chunk_flags = 0;
11265         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11266         ecne->tsn = htonl(high_tsn);
11267         ecne->num_pkts_since_cwr = htonl(1);
11268         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11269         asoc->ctrl_queue_cnt++;
11270 }
11271
11272 void
11273 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11274     struct mbuf *m, int iphlen, int bad_crc)
11275 {
11276         struct sctp_association *asoc;
11277         struct sctp_pktdrop_chunk *drp;
11278         struct sctp_tmit_chunk *chk;
11279         uint8_t *datap;
11280         int len;
11281         int was_trunc = 0;
11282         struct ip *iph;
11283
11284 #ifdef INET6
11285         struct ip6_hdr *ip6h;
11286
11287 #endif
11288         int fullsz = 0, extra = 0;
11289         long spc;
11290         int offset;
11291         struct sctp_chunkhdr *ch, chunk_buf;
11292         unsigned int chk_length;
11293
11294         if (!stcb) {
11295                 return;
11296         }
11297         asoc = &stcb->asoc;
11298         SCTP_TCB_LOCK_ASSERT(stcb);
11299         if (asoc->peer_supports_pktdrop == 0) {
11300                 /*-
11301                  * peer must declare support before I send one.
11302                  */
11303                 return;
11304         }
11305         if (stcb->sctp_socket == NULL) {
11306                 return;
11307         }
11308         sctp_alloc_a_chunk(stcb, chk);
11309         if (chk == NULL) {
11310                 return;
11311         }
11312         chk->copy_by_ref = 0;
11313         iph = mtod(m, struct ip *);
11314         if (iph == NULL) {
11315                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11316                 return;
11317         }
11318         switch (iph->ip_v) {
11319 #ifdef INET
11320         case IPVERSION:
11321                 /* IPv4 */
11322                 len = chk->send_size = iph->ip_len;
11323                 break;
11324 #endif
11325 #ifdef INET6
11326         case IPV6_VERSION >> 4:
11327                 /* IPv6 */
11328                 ip6h = mtod(m, struct ip6_hdr *);
11329                 len = chk->send_size = htons(ip6h->ip6_plen);
11330                 break;
11331 #endif
11332         default:
11333                 return;
11334         }
11335         /* Validate that we do not have an ABORT in here. */
11336         offset = iphlen + sizeof(struct sctphdr);
11337         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11338             sizeof(*ch), (uint8_t *) & chunk_buf);
11339         while (ch != NULL) {
11340                 chk_length = ntohs(ch->chunk_length);
11341                 if (chk_length < sizeof(*ch)) {
11342                         /* break to abort land */
11343                         break;
11344                 }
11345                 switch (ch->chunk_type) {
11346                 case SCTP_PACKET_DROPPED:
11347                 case SCTP_ABORT_ASSOCIATION:
11348                 case SCTP_INITIATION_ACK:
11349                         /**
11350                          * We don't respond with an PKT-DROP to an ABORT
11351                          * or PKT-DROP. We also do not respond to an
11352                          * INIT-ACK, because we can't know if the initiation
11353                          * tag is correct or not.
11354                          */
11355                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11356                         return;
11357                 default:
11358                         break;
11359                 }
11360                 offset += SCTP_SIZE32(chk_length);
11361                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11362                     sizeof(*ch), (uint8_t *) & chunk_buf);
11363         }
11364
11365         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11366             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11367                 /*
11368                  * only send 1 mtu worth, trim off the excess on the end.
11369                  */
11370                 fullsz = len - extra;
11371                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11372                 was_trunc = 1;
11373         }
11374         chk->asoc = &stcb->asoc;
11375         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11376         if (chk->data == NULL) {
11377 jump_out:
11378                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11379                 return;
11380         }
11381         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11382         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11383         if (drp == NULL) {
11384                 sctp_m_freem(chk->data);
11385                 chk->data = NULL;
11386                 goto jump_out;
11387         }
11388         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11389             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11390         chk->book_size_scale = 0;
11391         if (was_trunc) {
11392                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11393                 drp->trunc_len = htons(fullsz);
11394                 /*
11395                  * Len is already adjusted to size minus overhead above take
11396                  * out the pkt_drop chunk itself from it.
11397                  */
11398                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11399                 len = chk->send_size;
11400         } else {
11401                 /* no truncation needed */
11402                 drp->ch.chunk_flags = 0;
11403                 drp->trunc_len = htons(0);
11404         }
11405         if (bad_crc) {
11406                 drp->ch.chunk_flags |= SCTP_BADCRC;
11407         }
11408         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11409         SCTP_BUF_LEN(chk->data) = chk->send_size;
11410         chk->sent = SCTP_DATAGRAM_UNSENT;
11411         chk->snd_count = 0;
11412         if (net) {
11413                 /* we should hit here */
11414                 chk->whoTo = net;
11415                 atomic_add_int(&chk->whoTo->ref_count, 1);
11416         } else {
11417                 chk->whoTo = NULL;
11418         }
11419         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11420         chk->rec.chunk_id.can_take_data = 1;
11421         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11422         drp->ch.chunk_length = htons(chk->send_size);
11423         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11424         if (spc < 0) {
11425                 spc = 0;
11426         }
11427         drp->bottle_bw = htonl(spc);
11428         if (asoc->my_rwnd) {
11429                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11430                     asoc->size_on_all_streams +
11431                     asoc->my_rwnd_control_len +
11432                     stcb->sctp_socket->so_rcv.sb_cc);
11433         } else {
11434                 /*-
11435                  * If my rwnd is 0, possibly from mbuf depletion as well as
11436                  * space used, tell the peer there is NO space aka onq == bw
11437                  */
11438                 drp->current_onq = htonl(spc);
11439         }
11440         drp->reserved = 0;
11441         datap = drp->data;
11442         m_copydata(m, iphlen, len, (caddr_t)datap);
11443         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11444         asoc->ctrl_queue_cnt++;
11445 }
11446
11447 void
11448 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11449 {
11450         struct sctp_association *asoc;
11451         struct sctp_cwr_chunk *cwr;
11452         struct sctp_tmit_chunk *chk;
11453
11454         asoc = &stcb->asoc;
11455         SCTP_TCB_LOCK_ASSERT(stcb);
11456         if (net == NULL) {
11457                 return;
11458         }
11459         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11460                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11461                         /*
11462                          * found a previous CWR queued to same destination
11463                          * update it if needed
11464                          */
11465                         uint32_t ctsn;
11466
11467                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11468                         ctsn = ntohl(cwr->tsn);
11469                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11470                                 cwr->tsn = htonl(high_tsn);
11471                         }
11472                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11473                                 /* Make sure override is carried */
11474                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11475                         }
11476                         return;
11477                 }
11478         }
11479         sctp_alloc_a_chunk(stcb, chk);
11480         if (chk == NULL) {
11481                 return;
11482         }
11483         chk->copy_by_ref = 0;
11484         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11485         chk->rec.chunk_id.can_take_data = 1;
11486         chk->asoc = &stcb->asoc;
11487         chk->send_size = sizeof(struct sctp_cwr_chunk);
11488         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11489         if (chk->data == NULL) {
11490                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11491                 return;
11492         }
11493         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11494         SCTP_BUF_LEN(chk->data) = chk->send_size;
11495         chk->sent = SCTP_DATAGRAM_UNSENT;
11496         chk->snd_count = 0;
11497         chk->whoTo = net;
11498         atomic_add_int(&chk->whoTo->ref_count, 1);
11499         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11500         cwr->ch.chunk_type = SCTP_ECN_CWR;
11501         cwr->ch.chunk_flags = override;
11502         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11503         cwr->tsn = htonl(high_tsn);
11504         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11505         asoc->ctrl_queue_cnt++;
11506 }
11507
11508 void
11509 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11510     int number_entries, uint16_t * list,
11511     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11512 {
11513         int len, old_len, i;
11514         struct sctp_stream_reset_out_request *req_out;
11515         struct sctp_chunkhdr *ch;
11516
11517         ch = mtod(chk->data, struct sctp_chunkhdr *);
11518
11519
11520         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11521
11522         /* get to new offset for the param. */
11523         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11524         /* now how long will this param be? */
11525         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11526         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11527         req_out->ph.param_length = htons(len);
11528         req_out->request_seq = htonl(seq);
11529         req_out->response_seq = htonl(resp_seq);
11530         req_out->send_reset_at_tsn = htonl(last_sent);
11531         if (number_entries) {
11532                 for (i = 0; i < number_entries; i++) {
11533                         req_out->list_of_streams[i] = htons(list[i]);
11534                 }
11535         }
11536         if (SCTP_SIZE32(len) > len) {
11537                 /*-
11538                  * Need to worry about the pad we may end up adding to the
11539                  * end. This is easy since the struct is either aligned to 4
11540                  * bytes or 2 bytes off.
11541                  */
11542                 req_out->list_of_streams[number_entries] = 0;
11543         }
11544         /* now fix the chunk length */
11545         ch->chunk_length = htons(len + old_len);
11546         chk->book_size = len + old_len;
11547         chk->book_size_scale = 0;
11548         chk->send_size = SCTP_SIZE32(chk->book_size);
11549         SCTP_BUF_LEN(chk->data) = chk->send_size;
11550         return;
11551 }
11552
11553
11554 void
11555 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11556     int number_entries, uint16_t * list,
11557     uint32_t seq)
11558 {
11559         int len, old_len, i;
11560         struct sctp_stream_reset_in_request *req_in;
11561         struct sctp_chunkhdr *ch;
11562
11563         ch = mtod(chk->data, struct sctp_chunkhdr *);
11564
11565
11566         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11567
11568         /* get to new offset for the param. */
11569         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11570         /* now how long will this param be? */
11571         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11572         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11573         req_in->ph.param_length = htons(len);
11574         req_in->request_seq = htonl(seq);
11575         if (number_entries) {
11576                 for (i = 0; i < number_entries; i++) {
11577                         req_in->list_of_streams[i] = htons(list[i]);
11578                 }
11579         }
11580         if (SCTP_SIZE32(len) > len) {
11581                 /*-
11582                  * Need to worry about the pad we may end up adding to the
11583                  * end. This is easy since the struct is either aligned to 4
11584                  * bytes or 2 bytes off.
11585                  */
11586                 req_in->list_of_streams[number_entries] = 0;
11587         }
11588         /* now fix the chunk length */
11589         ch->chunk_length = htons(len + old_len);
11590         chk->book_size = len + old_len;
11591         chk->book_size_scale = 0;
11592         chk->send_size = SCTP_SIZE32(chk->book_size);
11593         SCTP_BUF_LEN(chk->data) = chk->send_size;
11594         return;
11595 }
11596
11597
11598 void
11599 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11600     uint32_t seq)
11601 {
11602         int len, old_len;
11603         struct sctp_stream_reset_tsn_request *req_tsn;
11604         struct sctp_chunkhdr *ch;
11605
11606         ch = mtod(chk->data, struct sctp_chunkhdr *);
11607
11608
11609         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11610
11611         /* get to new offset for the param. */
11612         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11613         /* now how long will this param be? */
11614         len = sizeof(struct sctp_stream_reset_tsn_request);
11615         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11616         req_tsn->ph.param_length = htons(len);
11617         req_tsn->request_seq = htonl(seq);
11618
11619         /* now fix the chunk length */
11620         ch->chunk_length = htons(len + old_len);
11621         chk->send_size = len + old_len;
11622         chk->book_size = SCTP_SIZE32(chk->send_size);
11623         chk->book_size_scale = 0;
11624         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11625         return;
11626 }
11627
11628 void
11629 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11630     uint32_t resp_seq, uint32_t result)
11631 {
11632         int len, old_len;
11633         struct sctp_stream_reset_response *resp;
11634         struct sctp_chunkhdr *ch;
11635
11636         ch = mtod(chk->data, struct sctp_chunkhdr *);
11637
11638
11639         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11640
11641         /* get to new offset for the param. */
11642         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11643         /* now how long will this param be? */
11644         len = sizeof(struct sctp_stream_reset_response);
11645         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11646         resp->ph.param_length = htons(len);
11647         resp->response_seq = htonl(resp_seq);
11648         resp->result = ntohl(result);
11649
11650         /* now fix the chunk length */
11651         ch->chunk_length = htons(len + old_len);
11652         chk->book_size = len + old_len;
11653         chk->book_size_scale = 0;
11654         chk->send_size = SCTP_SIZE32(chk->book_size);
11655         SCTP_BUF_LEN(chk->data) = chk->send_size;
11656         return;
11657
11658 }
11659
11660
11661 void
11662 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11663     uint32_t resp_seq, uint32_t result,
11664     uint32_t send_una, uint32_t recv_next)
11665 {
11666         int len, old_len;
11667         struct sctp_stream_reset_response_tsn *resp;
11668         struct sctp_chunkhdr *ch;
11669
11670         ch = mtod(chk->data, struct sctp_chunkhdr *);
11671
11672
11673         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11674
11675         /* get to new offset for the param. */
11676         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11677         /* now how long will this param be? */
11678         len = sizeof(struct sctp_stream_reset_response_tsn);
11679         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11680         resp->ph.param_length = htons(len);
11681         resp->response_seq = htonl(resp_seq);
11682         resp->result = htonl(result);
11683         resp->senders_next_tsn = htonl(send_una);
11684         resp->receivers_next_tsn = htonl(recv_next);
11685
11686         /* now fix the chunk length */
11687         ch->chunk_length = htons(len + old_len);
11688         chk->book_size = len + old_len;
11689         chk->send_size = SCTP_SIZE32(chk->book_size);
11690         chk->book_size_scale = 0;
11691         SCTP_BUF_LEN(chk->data) = chk->send_size;
11692         return;
11693 }
11694
11695 static void
11696 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11697     uint32_t seq,
11698     uint16_t adding)
11699 {
11700         int len, old_len;
11701         struct sctp_chunkhdr *ch;
11702         struct sctp_stream_reset_add_strm *addstr;
11703
11704         ch = mtod(chk->data, struct sctp_chunkhdr *);
11705         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11706
11707         /* get to new offset for the param. */
11708         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11709         /* now how long will this param be? */
11710         len = sizeof(struct sctp_stream_reset_add_strm);
11711
11712         /* Fill it out. */
11713         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11714         addstr->ph.param_length = htons(len);
11715         addstr->request_seq = htonl(seq);
11716         addstr->number_of_streams = htons(adding);
11717         addstr->reserved = 0;
11718
11719         /* now fix the chunk length */
11720         ch->chunk_length = htons(len + old_len);
11721         chk->send_size = len + old_len;
11722         chk->book_size = SCTP_SIZE32(chk->send_size);
11723         chk->book_size_scale = 0;
11724         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11725         return;
11726 }
11727
11728 static void
11729 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11730     uint32_t seq,
11731     uint16_t adding)
11732 {
11733         int len, old_len;
11734         struct sctp_chunkhdr *ch;
11735         struct sctp_stream_reset_add_strm *addstr;
11736
11737         ch = mtod(chk->data, struct sctp_chunkhdr *);
11738         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11739
11740         /* get to new offset for the param. */
11741         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11742         /* now how long will this param be? */
11743         len = sizeof(struct sctp_stream_reset_add_strm);
11744         /* Fill it out. */
11745         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11746         addstr->ph.param_length = htons(len);
11747         addstr->request_seq = htonl(seq);
11748         addstr->number_of_streams = htons(adding);
11749         addstr->reserved = 0;
11750
11751         /* now fix the chunk length */
11752         ch->chunk_length = htons(len + old_len);
11753         chk->send_size = len + old_len;
11754         chk->book_size = SCTP_SIZE32(chk->send_size);
11755         chk->book_size_scale = 0;
11756         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11757         return;
11758 }
11759
11760
11761
11762 int
11763 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11764     int number_entries, uint16_t * list,
11765     uint8_t send_out_req,
11766     uint8_t send_in_req,
11767     uint8_t send_tsn_req,
11768     uint8_t add_stream,
11769     uint16_t adding_o,
11770     uint16_t adding_i, uint8_t peer_asked
11771 )
11772 {
11773
11774         struct sctp_association *asoc;
11775         struct sctp_tmit_chunk *chk;
11776         struct sctp_chunkhdr *ch;
11777         uint32_t seq;
11778
11779         asoc = &stcb->asoc;
11780         if (asoc->stream_reset_outstanding) {
11781                 /*-
11782                  * Already one pending, must get ACK back to clear the flag.
11783                  */
11784                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11785                 return (EBUSY);
11786         }
11787         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11788             (add_stream == 0)) {
11789                 /* nothing to do */
11790                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11791                 return (EINVAL);
11792         }
11793         if (send_tsn_req && (send_out_req || send_in_req)) {
11794                 /* error, can't do that */
11795                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11796                 return (EINVAL);
11797         }
11798         sctp_alloc_a_chunk(stcb, chk);
11799         if (chk == NULL) {
11800                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11801                 return (ENOMEM);
11802         }
11803         chk->copy_by_ref = 0;
11804         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11805         chk->rec.chunk_id.can_take_data = 0;
11806         chk->asoc = &stcb->asoc;
11807         chk->book_size = sizeof(struct sctp_chunkhdr);
11808         chk->send_size = SCTP_SIZE32(chk->book_size);
11809         chk->book_size_scale = 0;
11810
11811         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11812         if (chk->data == NULL) {
11813                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11814                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11815                 return (ENOMEM);
11816         }
11817         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11818
11819         /* setup chunk parameters */
11820         chk->sent = SCTP_DATAGRAM_UNSENT;
11821         chk->snd_count = 0;
11822         if (stcb->asoc.alternate) {
11823                 chk->whoTo = stcb->asoc.alternate;
11824         } else {
11825                 chk->whoTo = stcb->asoc.primary_destination;
11826         }
11827         atomic_add_int(&chk->whoTo->ref_count, 1);
11828         ch = mtod(chk->data, struct sctp_chunkhdr *);
11829         ch->chunk_type = SCTP_STREAM_RESET;
11830         ch->chunk_flags = 0;
11831         ch->chunk_length = htons(chk->book_size);
11832         SCTP_BUF_LEN(chk->data) = chk->send_size;
11833
11834         seq = stcb->asoc.str_reset_seq_out;
11835         if (send_out_req) {
11836                 sctp_add_stream_reset_out(chk, number_entries, list,
11837                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11838                 asoc->stream_reset_out_is_outstanding = 1;
11839                 seq++;
11840                 asoc->stream_reset_outstanding++;
11841         }
11842         if ((add_stream & 1) &&
11843             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11844                 /* Need to allocate more */
11845                 struct sctp_stream_out *oldstream;
11846                 struct sctp_stream_queue_pending *sp, *nsp;
11847                 int i;
11848
11849                 oldstream = stcb->asoc.strmout;
11850                 /* get some more */
11851                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11852                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11853                     SCTP_M_STRMO);
11854                 if (stcb->asoc.strmout == NULL) {
11855                         uint8_t x;
11856
11857                         stcb->asoc.strmout = oldstream;
11858                         /* Turn off the bit */
11859                         x = add_stream & 0xfe;
11860                         add_stream = x;
11861                         goto skip_stuff;
11862                 }
11863                 /*
11864                  * Ok now we proceed with copying the old out stuff and
11865                  * initializing the new stuff.
11866                  */
11867                 SCTP_TCB_SEND_LOCK(stcb);
11868                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11869                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11870                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11871                         stcb->asoc.strmout[i].next_sequence_sent = oldstream[i].next_sequence_sent;
11872                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11873                         stcb->asoc.strmout[i].stream_no = i;
11874                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11875                         /* now anything on those queues? */
11876                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11877                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11878                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11879                         }
11880                         /* Now move assoc pointers too */
11881                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11882                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11883                         }
11884                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11885                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11886                         }
11887                 }
11888                 /* now the new streams */
11889                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11890                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11891                         stcb->asoc.strmout[i].next_sequence_sent = 0x0;
11892                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11893                         stcb->asoc.strmout[i].stream_no = i;
11894                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11895                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11896                 }
11897                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11898                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11899                 SCTP_TCB_SEND_UNLOCK(stcb);
11900         }
11901 skip_stuff:
11902         if ((add_stream & 1) && (adding_o > 0)) {
11903                 asoc->strm_pending_add_size = adding_o;
11904                 asoc->peer_req_out = peer_asked;
11905                 sctp_add_an_out_stream(chk, seq, adding_o);
11906                 seq++;
11907                 asoc->stream_reset_outstanding++;
11908         }
11909         if ((add_stream & 2) && (adding_i > 0)) {
11910                 sctp_add_an_in_stream(chk, seq, adding_i);
11911                 seq++;
11912                 asoc->stream_reset_outstanding++;
11913         }
11914         if (send_in_req) {
11915                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11916                 seq++;
11917                 asoc->stream_reset_outstanding++;
11918         }
11919         if (send_tsn_req) {
11920                 sctp_add_stream_reset_tsn(chk, seq);
11921                 asoc->stream_reset_outstanding++;
11922         }
11923         asoc->str_reset = chk;
11924         /* insert the chunk for sending */
11925         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11926             chk,
11927             sctp_next);
11928         asoc->ctrl_queue_cnt++;
11929         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11930         return (0);
11931 }
11932
11933 void
11934 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11935     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
11936 {
11937         /*-
11938          * Formulate the abort message, and send it back down.
11939          */
11940         struct mbuf *o_pak;
11941         struct mbuf *mout;
11942         struct sctp_abort_msg *abm;
11943         struct ip *iph;
11944         struct udphdr *udp;
11945         int iphlen_out, len;
11946
11947 #ifdef INET
11948         struct ip *iph_out;
11949
11950 #endif
11951 #ifdef INET6
11952         struct ip6_hdr *ip6, *ip6_out;
11953
11954 #endif
11955
11956         /* don't respond to ABORT with ABORT */
11957         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11958                 if (err_cause)
11959                         sctp_m_freem(err_cause);
11960                 return;
11961         }
11962         iph = mtod(m, struct ip *);
11963         switch (iph->ip_v) {
11964 #ifdef INET
11965         case IPVERSION:
11966                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
11967                 break;
11968 #endif
11969 #ifdef INET6
11970         case IPV6_VERSION >> 4:
11971                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
11972                 break;
11973 #endif
11974         default:
11975                 if (err_cause) {
11976                         sctp_m_freem(err_cause);
11977                 }
11978                 return;
11979         }
11980         if (port) {
11981                 len += sizeof(struct udphdr);
11982         }
11983         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
11984         if (mout == NULL) {
11985                 if (err_cause) {
11986                         sctp_m_freem(err_cause);
11987                 }
11988                 return;
11989         }
11990         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11991         SCTP_BUF_LEN(mout) = len;
11992         SCTP_BUF_NEXT(mout) = err_cause;
11993         if (m->m_flags & M_FLOWID) {
11994                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
11995                 mout->m_flags |= M_FLOWID;
11996         }
11997 #ifdef INET
11998         iph_out = NULL;
11999 #endif
12000 #ifdef INET6
12001         ip6_out = NULL;
12002 #endif
12003         switch (iph->ip_v) {
12004 #ifdef INET
12005         case IPVERSION:
12006                 iph_out = mtod(mout, struct ip *);
12007
12008                 /* Fill in the IP header for the ABORT */
12009                 iph_out->ip_v = IPVERSION;
12010                 iph_out->ip_hl = (sizeof(struct ip) / 4);
12011                 iph_out->ip_tos = (u_char)0;
12012                 iph_out->ip_id = 0;
12013                 iph_out->ip_off = 0;
12014                 iph_out->ip_ttl = MAXTTL;
12015                 if (port) {
12016                         iph_out->ip_p = IPPROTO_UDP;
12017                 } else {
12018                         iph_out->ip_p = IPPROTO_SCTP;
12019                 }
12020                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12021                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12022                 /* let IP layer calculate this */
12023                 iph_out->ip_sum = 0;
12024
12025                 iphlen_out = sizeof(*iph_out);
12026                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
12027                 break;
12028 #endif
12029 #ifdef INET6
12030         case IPV6_VERSION >> 4:
12031                 ip6 = (struct ip6_hdr *)iph;
12032                 ip6_out = mtod(mout, struct ip6_hdr *);
12033
12034                 /* Fill in the IP6 header for the ABORT */
12035                 ip6_out->ip6_flow = ip6->ip6_flow;
12036                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
12037                 if (port) {
12038                         ip6_out->ip6_nxt = IPPROTO_UDP;
12039                 } else {
12040                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12041                 }
12042                 ip6_out->ip6_src = ip6->ip6_dst;
12043                 ip6_out->ip6_dst = ip6->ip6_src;
12044
12045                 iphlen_out = sizeof(*ip6_out);
12046                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
12047                 break;
12048 #endif                          /* INET6 */
12049         default:
12050                 /* Currently not supported */
12051                 sctp_m_freem(mout);
12052                 return;
12053         }
12054
12055         udp = (struct udphdr *)abm;
12056         if (port) {
12057                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
12058                         sctp_m_freem(mout);
12059                         return;
12060                 }
12061                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12062                 udp->uh_dport = port;
12063                 /* set udp->uh_ulen later */
12064                 udp->uh_sum = 0;
12065                 iphlen_out += sizeof(struct udphdr);
12066                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
12067         }
12068         abm->sh.src_port = sh->dest_port;
12069         abm->sh.dest_port = sh->src_port;
12070         abm->sh.checksum = 0;
12071         if (vtag == 0) {
12072                 abm->sh.v_tag = sh->v_tag;
12073                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
12074         } else {
12075                 abm->sh.v_tag = htonl(vtag);
12076                 abm->msg.ch.chunk_flags = 0;
12077         }
12078         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
12079
12080         if (err_cause) {
12081                 struct mbuf *m_tmp = err_cause;
12082                 int err_len = 0;
12083
12084                 /* get length of the err_cause chain */
12085                 while (m_tmp != NULL) {
12086                         err_len += SCTP_BUF_LEN(m_tmp);
12087                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12088                 }
12089                 len = SCTP_BUF_LEN(mout) + err_len;
12090                 if (err_len % 4) {
12091                         /* need pad at end of chunk */
12092                         uint32_t cpthis = 0;
12093                         int padlen;
12094
12095                         padlen = 4 - (len % 4);
12096                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12097                         len += padlen;
12098                 }
12099                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
12100         } else {
12101                 len = SCTP_BUF_LEN(mout);
12102                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
12103         }
12104
12105         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12106                 /* no mbuf's */
12107                 sctp_m_freem(mout);
12108                 return;
12109         }
12110 #ifdef INET
12111         if (iph_out != NULL) {
12112                 sctp_route_t ro;
12113                 int ret;
12114
12115                 /* zap the stack pointer to the route */
12116                 bzero(&ro, sizeof ro);
12117                 if (port) {
12118                         udp->uh_ulen = htons(len - sizeof(struct ip));
12119                         if (V_udp_cksum) {
12120                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12121                         } else {
12122                                 udp->uh_sum = 0;
12123                         }
12124                 }
12125                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
12126                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
12127                 /* set IPv4 length */
12128                 iph_out->ip_len = len;
12129                 /* out it goes */
12130 #ifdef  SCTP_PACKET_LOGGING
12131                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12132                         sctp_packet_log(mout, len);
12133 #endif
12134                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12135                 if (port) {
12136 #if defined(SCTP_WITH_NO_CSUM)
12137                         SCTP_STAT_INCR(sctps_sendnocrc);
12138 #else
12139                         abm->sh.checksum = sctp_calculate_cksum(mout, iphlen_out);
12140                         SCTP_STAT_INCR(sctps_sendswcrc);
12141 #endif
12142                         if (V_udp_cksum) {
12143                                 SCTP_ENABLE_UDP_CSUM(o_pak);
12144                         }
12145                 } else {
12146 #if defined(SCTP_WITH_NO_CSUM)
12147                         SCTP_STAT_INCR(sctps_sendnocrc);
12148 #else
12149                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12150                         mout->m_pkthdr.csum_data = 0;
12151                         SCTP_STAT_INCR(sctps_sendhwcrc);
12152 #endif
12153                 }
12154                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12155
12156                 /* Free the route if we got one back */
12157                 if (ro.ro_rt)
12158                         RTFREE(ro.ro_rt);
12159         }
12160 #endif
12161 #ifdef INET6
12162         if (ip6_out != NULL) {
12163                 struct route_in6 ro;
12164                 int ret;
12165                 struct ifnet *ifp = NULL;
12166
12167                 /* zap the stack pointer to the route */
12168                 bzero(&ro, sizeof(ro));
12169                 if (port) {
12170                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12171                 }
12172                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
12173                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
12174                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12175 #ifdef  SCTP_PACKET_LOGGING
12176                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12177                         sctp_packet_log(mout, len);
12178 #endif
12179                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12180                 if (port) {
12181 #if defined(SCTP_WITH_NO_CSUM)
12182                         SCTP_STAT_INCR(sctps_sendnocrc);
12183 #else
12184                         abm->sh.checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12185                         SCTP_STAT_INCR(sctps_sendswcrc);
12186 #endif
12187                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12188                                 udp->uh_sum = 0xffff;
12189                         }
12190                 } else {
12191 #if defined(SCTP_WITH_NO_CSUM)
12192                         SCTP_STAT_INCR(sctps_sendnocrc);
12193 #else
12194                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12195                         mout->m_pkthdr.csum_data = 0;
12196                         SCTP_STAT_INCR(sctps_sendhwcrc);
12197 #endif
12198                 }
12199                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12200
12201                 /* Free the route if we got one back */
12202                 if (ro.ro_rt)
12203                         RTFREE(ro.ro_rt);
12204         }
12205 #endif
12206         SCTP_STAT_INCR(sctps_sendpackets);
12207         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12208         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12209 }
12210
12211 void
12212 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
12213     uint32_t vrf_id, uint16_t port)
12214 {
12215         struct mbuf *o_pak;
12216         struct sctphdr *sh, *sh_out;
12217         struct sctp_chunkhdr *ch;
12218         struct ip *iph;
12219         struct udphdr *udp = NULL;
12220         struct mbuf *mout;
12221         int iphlen_out, len;
12222
12223 #ifdef INET
12224         struct ip *iph_out;
12225
12226 #endif
12227 #ifdef INET6
12228         struct ip6_hdr *ip6, *ip6_out;
12229
12230 #endif
12231
12232         iph = mtod(m, struct ip *);
12233         sh = (struct sctphdr *)((caddr_t)iph + iphlen);
12234         switch (iph->ip_v) {
12235 #ifdef INET
12236         case IPVERSION:
12237                 len = (sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12238                 break;
12239 #endif
12240 #ifdef INET6
12241         case IPV6_VERSION >> 4:
12242                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr));
12243                 break;
12244 #endif
12245         default:
12246                 if (scm) {
12247                         sctp_m_freem(scm);
12248                 }
12249                 return;
12250         }
12251         if (port) {
12252                 len += sizeof(struct udphdr);
12253         }
12254         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
12255         if (mout == NULL) {
12256                 if (scm) {
12257                         sctp_m_freem(scm);
12258                 }
12259                 return;
12260         }
12261         SCTP_BUF_RESV_UF(mout, max_linkhdr);
12262         SCTP_BUF_LEN(mout) = len;
12263         SCTP_BUF_NEXT(mout) = scm;
12264         if (m->m_flags & M_FLOWID) {
12265                 mout->m_pkthdr.flowid = m->m_pkthdr.flowid;
12266                 mout->m_flags |= M_FLOWID;
12267         }
12268 #ifdef INET
12269         iph_out = NULL;
12270 #endif
12271 #ifdef INET6
12272         ip6_out = NULL;
12273 #endif
12274         switch (iph->ip_v) {
12275 #ifdef INET
12276         case IPVERSION:
12277                 iph_out = mtod(mout, struct ip *);
12278
12279                 /* Fill in the IP header for the ABORT */
12280                 iph_out->ip_v = IPVERSION;
12281                 iph_out->ip_hl = (sizeof(struct ip) / 4);
12282                 iph_out->ip_tos = (u_char)0;
12283                 iph_out->ip_id = 0;
12284                 iph_out->ip_off = 0;
12285                 iph_out->ip_ttl = MAXTTL;
12286                 if (port) {
12287                         iph_out->ip_p = IPPROTO_UDP;
12288                 } else {
12289                         iph_out->ip_p = IPPROTO_SCTP;
12290                 }
12291                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12292                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12293                 /* let IP layer calculate this */
12294                 iph_out->ip_sum = 0;
12295
12296                 iphlen_out = sizeof(struct ip);
12297                 sh_out = (struct sctphdr *)((caddr_t)iph_out + iphlen_out);
12298                 break;
12299 #endif
12300 #ifdef INET6
12301         case IPV6_VERSION >> 4:
12302                 ip6 = (struct ip6_hdr *)iph;
12303                 ip6_out = mtod(mout, struct ip6_hdr *);
12304
12305                 /* Fill in the IP6 header for the ABORT */
12306                 ip6_out->ip6_flow = ip6->ip6_flow;
12307                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
12308                 if (port) {
12309                         ip6_out->ip6_nxt = IPPROTO_UDP;
12310                 } else {
12311                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12312                 }
12313                 ip6_out->ip6_src = ip6->ip6_dst;
12314                 ip6_out->ip6_dst = ip6->ip6_src;
12315
12316                 iphlen_out = sizeof(struct ip6_hdr);
12317                 sh_out = (struct sctphdr *)((caddr_t)ip6_out + iphlen_out);
12318                 break;
12319 #endif                          /* INET6 */
12320         default:
12321                 /* Currently not supported */
12322                 sctp_m_freem(mout);
12323                 return;
12324         }
12325
12326         udp = (struct udphdr *)sh_out;
12327         if (port) {
12328                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
12329                         sctp_m_freem(mout);
12330                         return;
12331                 }
12332                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12333                 udp->uh_dport = port;
12334                 /* set udp->uh_ulen later */
12335                 udp->uh_sum = 0;
12336                 iphlen_out += sizeof(struct udphdr);
12337                 sh_out = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
12338         }
12339         sh_out->src_port = sh->dest_port;
12340         sh_out->dest_port = sh->src_port;
12341         sh_out->v_tag = vtag;
12342         sh_out->checksum = 0;
12343
12344         ch = (struct sctp_chunkhdr *)((caddr_t)sh_out + sizeof(struct sctphdr));
12345         ch->chunk_type = SCTP_OPERATION_ERROR;
12346         ch->chunk_flags = 0;
12347
12348         if (scm) {
12349                 struct mbuf *m_tmp = scm;
12350                 int cause_len = 0;
12351
12352                 /* get length of the err_cause chain */
12353                 while (m_tmp != NULL) {
12354                         cause_len += SCTP_BUF_LEN(m_tmp);
12355                         m_tmp = SCTP_BUF_NEXT(m_tmp);
12356                 }
12357                 len = SCTP_BUF_LEN(mout) + cause_len;
12358                 if (cause_len % 4) {
12359                         /* need pad at end of chunk */
12360                         uint32_t cpthis = 0;
12361                         int padlen;
12362
12363                         padlen = 4 - (len % 4);
12364                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
12365                         len += padlen;
12366                 }
12367                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
12368         } else {
12369                 len = SCTP_BUF_LEN(mout);
12370                 ch->chunk_length = htons(sizeof(struct sctp_chunkhdr));
12371         }
12372
12373         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12374                 /* no mbuf's */
12375                 sctp_m_freem(mout);
12376                 return;
12377         }
12378 #ifdef INET
12379         if (iph_out != NULL) {
12380                 sctp_route_t ro;
12381                 int ret;
12382
12383                 /* zap the stack pointer to the route */
12384                 bzero(&ro, sizeof ro);
12385                 if (port) {
12386                         udp->uh_ulen = htons(len - sizeof(struct ip));
12387                         if (V_udp_cksum) {
12388                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12389                         } else {
12390                                 udp->uh_sum = 0;
12391                         }
12392                 }
12393                 /* set IPv4 length */
12394                 iph_out->ip_len = len;
12395                 /* out it goes */
12396 #ifdef  SCTP_PACKET_LOGGING
12397                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12398                         sctp_packet_log(mout, len);
12399 #endif
12400                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12401                 if (port) {
12402 #if defined(SCTP_WITH_NO_CSUM)
12403                         SCTP_STAT_INCR(sctps_sendnocrc);
12404 #else
12405                         sh_out->checksum = sctp_calculate_cksum(mout, iphlen_out);
12406                         SCTP_STAT_INCR(sctps_sendswcrc);
12407 #endif
12408                         if (V_udp_cksum) {
12409                                 SCTP_ENABLE_UDP_CSUM(o_pak);
12410                         }
12411                 } else {
12412 #if defined(SCTP_WITH_NO_CSUM)
12413                         SCTP_STAT_INCR(sctps_sendnocrc);
12414 #else
12415                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12416                         mout->m_pkthdr.csum_data = 0;
12417                         SCTP_STAT_INCR(sctps_sendhwcrc);
12418 #endif
12419                 }
12420                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
12421
12422                 /* Free the route if we got one back */
12423                 if (ro.ro_rt)
12424                         RTFREE(ro.ro_rt);
12425         }
12426 #endif
12427 #ifdef INET6
12428         if (ip6_out != NULL) {
12429                 struct route_in6 ro;
12430                 int ret;
12431                 struct ifnet *ifp = NULL;
12432
12433                 /* zap the stack pointer to the route */
12434                 bzero(&ro, sizeof(ro));
12435                 if (port) {
12436                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
12437                 }
12438                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
12439 #ifdef  SCTP_PACKET_LOGGING
12440                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12441                         sctp_packet_log(mout, len);
12442 #endif
12443                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
12444                 if (port) {
12445 #if defined(SCTP_WITH_NO_CSUM)
12446                         SCTP_STAT_INCR(sctps_sendnocrc);
12447 #else
12448                         sh_out->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
12449                         SCTP_STAT_INCR(sctps_sendswcrc);
12450 #endif
12451                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
12452                                 udp->uh_sum = 0xffff;
12453                         }
12454                 } else {
12455 #if defined(SCTP_WITH_NO_CSUM)
12456                         SCTP_STAT_INCR(sctps_sendnocrc);
12457 #else
12458                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
12459                         mout->m_pkthdr.csum_data = 0;
12460                         SCTP_STAT_INCR(sctps_sendhwcrc);
12461 #endif
12462                 }
12463                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, NULL, vrf_id);
12464
12465                 /* Free the route if we got one back */
12466                 if (ro.ro_rt)
12467                         RTFREE(ro.ro_rt);
12468         }
12469 #endif
12470         SCTP_STAT_INCR(sctps_sendpackets);
12471         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12472         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12473 }
12474
12475 static struct mbuf *
12476 sctp_copy_resume(struct uio *uio,
12477     int max_send_len,
12478     int user_marks_eor,
12479     int *error,
12480     uint32_t * sndout,
12481     struct mbuf **new_tail)
12482 {
12483         struct mbuf *m;
12484
12485         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12486             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12487         if (m == NULL) {
12488                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12489                 *error = ENOMEM;
12490         } else {
12491                 *sndout = m_length(m, NULL);
12492                 *new_tail = m_last(m);
12493         }
12494         return (m);
12495 }
12496
12497 static int
12498 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12499     struct uio *uio,
12500     int resv_upfront)
12501 {
12502         int left;
12503
12504         left = sp->length;
12505         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12506             resv_upfront, 0);
12507         if (sp->data == NULL) {
12508                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12509                 return (ENOMEM);
12510         }
12511         sp->tail_mbuf = m_last(sp->data);
12512         return (0);
12513 }
12514
12515
12516
12517 static struct sctp_stream_queue_pending *
12518 sctp_copy_it_in(struct sctp_tcb *stcb,
12519     struct sctp_association *asoc,
12520     struct sctp_sndrcvinfo *srcv,
12521     struct uio *uio,
12522     struct sctp_nets *net,
12523     int max_send_len,
12524     int user_marks_eor,
12525     int *error)
12526 {
12527         /*-
12528          * This routine must be very careful in its work. Protocol
12529          * processing is up and running so care must be taken to spl...()
12530          * when you need to do something that may effect the stcb/asoc. The
12531          * sb is locked however. When data is copied the protocol processing
12532          * should be enabled since this is a slower operation...
12533          */
12534         struct sctp_stream_queue_pending *sp = NULL;
12535         int resv_in_first;
12536
12537         *error = 0;
12538         /* Now can we send this? */
12539         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12540             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12541             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12542             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12543                 /* got data while shutting down */
12544                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12545                 *error = ECONNRESET;
12546                 goto out_now;
12547         }
12548         sctp_alloc_a_strmoq(stcb, sp);
12549         if (sp == NULL) {
12550                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12551                 *error = ENOMEM;
12552                 goto out_now;
12553         }
12554         sp->act_flags = 0;
12555         sp->sender_all_done = 0;
12556         sp->sinfo_flags = srcv->sinfo_flags;
12557         sp->timetolive = srcv->sinfo_timetolive;
12558         sp->ppid = srcv->sinfo_ppid;
12559         sp->context = srcv->sinfo_context;
12560         sp->strseq = 0;
12561         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12562
12563         sp->stream = srcv->sinfo_stream;
12564         sp->length = min(uio->uio_resid, max_send_len);
12565         if ((sp->length == (uint32_t) uio->uio_resid) &&
12566             ((user_marks_eor == 0) ||
12567             (srcv->sinfo_flags & SCTP_EOF) ||
12568             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12569                 sp->msg_is_complete = 1;
12570         } else {
12571                 sp->msg_is_complete = 0;
12572         }
12573         sp->sender_all_done = 0;
12574         sp->some_taken = 0;
12575         sp->put_last_out = 0;
12576         resv_in_first = sizeof(struct sctp_data_chunk);
12577         sp->data = sp->tail_mbuf = NULL;
12578         if (sp->length == 0) {
12579                 *error = 0;
12580                 goto skip_copy;
12581         }
12582         if (srcv->sinfo_keynumber_valid) {
12583                 sp->auth_keyid = srcv->sinfo_keynumber;
12584         } else {
12585                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12586         }
12587         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12588                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12589                 sp->holds_key_ref = 1;
12590         }
12591         *error = sctp_copy_one(sp, uio, resv_in_first);
12592 skip_copy:
12593         if (*error) {
12594                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12595                 sp = NULL;
12596         } else {
12597                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12598                         sp->net = net;
12599                         atomic_add_int(&sp->net->ref_count, 1);
12600                 } else {
12601                         sp->net = NULL;
12602                 }
12603                 sctp_set_prsctp_policy(sp);
12604         }
12605 out_now:
12606         return (sp);
12607 }
12608
12609
12610 int
12611 sctp_sosend(struct socket *so,
12612     struct sockaddr *addr,
12613     struct uio *uio,
12614     struct mbuf *top,
12615     struct mbuf *control,
12616     int flags,
12617     struct thread *p
12618 )
12619 {
12620         int error, use_sndinfo = 0;
12621         struct sctp_sndrcvinfo sndrcvninfo;
12622         struct sockaddr *addr_to_use;
12623
12624 #if defined(INET) && defined(INET6)
12625         struct sockaddr_in sin;
12626
12627 #endif
12628
12629         if (control) {
12630                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12631                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12632                     sizeof(sndrcvninfo))) {
12633                         /* got one */
12634                         use_sndinfo = 1;
12635                 }
12636         }
12637         addr_to_use = addr;
12638 #if defined(INET) && defined(INET6)
12639         if ((addr) && (addr->sa_family == AF_INET6)) {
12640                 struct sockaddr_in6 *sin6;
12641
12642                 sin6 = (struct sockaddr_in6 *)addr;
12643                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12644                         in6_sin6_2_sin(&sin, sin6);
12645                         addr_to_use = (struct sockaddr *)&sin;
12646                 }
12647         }
12648 #endif
12649         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12650             control,
12651             flags,
12652             use_sndinfo ? &sndrcvninfo : NULL
12653             ,p
12654             );
12655         return (error);
12656 }
12657
12658
12659 int
12660 sctp_lower_sosend(struct socket *so,
12661     struct sockaddr *addr,
12662     struct uio *uio,
12663     struct mbuf *i_pak,
12664     struct mbuf *control,
12665     int flags,
12666     struct sctp_sndrcvinfo *srcv
12667     ,
12668     struct thread *p
12669 )
12670 {
12671         unsigned int sndlen = 0, max_len;
12672         int error, len;
12673         struct mbuf *top = NULL;
12674         int queue_only = 0, queue_only_for_init = 0;
12675         int free_cnt_applied = 0;
12676         int un_sent;
12677         int now_filled = 0;
12678         unsigned int inqueue_bytes = 0;
12679         struct sctp_block_entry be;
12680         struct sctp_inpcb *inp;
12681         struct sctp_tcb *stcb = NULL;
12682         struct timeval now;
12683         struct sctp_nets *net;
12684         struct sctp_association *asoc;
12685         struct sctp_inpcb *t_inp;
12686         int user_marks_eor;
12687         int create_lock_applied = 0;
12688         int nagle_applies = 0;
12689         int some_on_control = 0;
12690         int got_all_of_the_send = 0;
12691         int hold_tcblock = 0;
12692         int non_blocking = 0;
12693         uint32_t local_add_more, local_soresv = 0;
12694         uint16_t port;
12695         uint16_t sinfo_flags;
12696         sctp_assoc_t sinfo_assoc_id;
12697
12698         error = 0;
12699         net = NULL;
12700         stcb = NULL;
12701         asoc = NULL;
12702
12703         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12704         if (inp == NULL) {
12705                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12706                 error = EINVAL;
12707                 if (i_pak) {
12708                         SCTP_RELEASE_PKT(i_pak);
12709                 }
12710                 return (error);
12711         }
12712         if ((uio == NULL) && (i_pak == NULL)) {
12713                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12714                 return (EINVAL);
12715         }
12716         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12717         atomic_add_int(&inp->total_sends, 1);
12718         if (uio) {
12719                 if (uio->uio_resid < 0) {
12720                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12721                         return (EINVAL);
12722                 }
12723                 sndlen = uio->uio_resid;
12724         } else {
12725                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12726                 sndlen = SCTP_HEADER_LEN(i_pak);
12727         }
12728         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12729             addr,
12730             sndlen);
12731         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12732             (inp->sctp_socket->so_qlimit)) {
12733                 /* The listener can NOT send */
12734                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12735                 error = ENOTCONN;
12736                 goto out_unlocked;
12737         }
12738         /**
12739          * Pre-screen address, if one is given the sin-len
12740          * must be set correctly!
12741          */
12742         if (addr) {
12743                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12744
12745                 switch (raddr->sa.sa_family) {
12746 #if defined(INET)
12747                 case AF_INET:
12748                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12749                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12750                                 error = EINVAL;
12751                                 goto out_unlocked;
12752                         }
12753                         port = raddr->sin.sin_port;
12754                         break;
12755 #endif
12756 #if defined(INET6)
12757                 case AF_INET6:
12758                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12759                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12760                                 error = EINVAL;
12761                                 goto out_unlocked;
12762                         }
12763                         port = raddr->sin6.sin6_port;
12764                         break;
12765 #endif
12766                 default:
12767                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12768                         error = EAFNOSUPPORT;
12769                         goto out_unlocked;
12770                 }
12771         } else
12772                 port = 0;
12773
12774         if (srcv) {
12775                 sinfo_flags = srcv->sinfo_flags;
12776                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12777                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12778                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12779                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12780                         error = EINVAL;
12781                         goto out_unlocked;
12782                 }
12783                 if (srcv->sinfo_flags)
12784                         SCTP_STAT_INCR(sctps_sends_with_flags);
12785         } else {
12786                 sinfo_flags = inp->def_send.sinfo_flags;
12787                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12788         }
12789         if (sinfo_flags & SCTP_SENDALL) {
12790                 /* its a sendall */
12791                 error = sctp_sendall(inp, uio, top, srcv);
12792                 top = NULL;
12793                 goto out_unlocked;
12794         }
12795         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12796                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12797                 error = EINVAL;
12798                 goto out_unlocked;
12799         }
12800         /* now we must find the assoc */
12801         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12802             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12803                 SCTP_INP_RLOCK(inp);
12804                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12805                 if (stcb) {
12806                         SCTP_TCB_LOCK(stcb);
12807                         hold_tcblock = 1;
12808                 }
12809                 SCTP_INP_RUNLOCK(inp);
12810         } else if (sinfo_assoc_id) {
12811                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12812         } else if (addr) {
12813                 /*-
12814                  * Since we did not use findep we must
12815                  * increment it, and if we don't find a tcb
12816                  * decrement it.
12817                  */
12818                 SCTP_INP_WLOCK(inp);
12819                 SCTP_INP_INCR_REF(inp);
12820                 SCTP_INP_WUNLOCK(inp);
12821                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12822                 if (stcb == NULL) {
12823                         SCTP_INP_WLOCK(inp);
12824                         SCTP_INP_DECR_REF(inp);
12825                         SCTP_INP_WUNLOCK(inp);
12826                 } else {
12827                         hold_tcblock = 1;
12828                 }
12829         }
12830         if ((stcb == NULL) && (addr)) {
12831                 /* Possible implicit send? */
12832                 SCTP_ASOC_CREATE_LOCK(inp);
12833                 create_lock_applied = 1;
12834                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12835                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12836                         /* Should I really unlock ? */
12837                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12838                         error = EINVAL;
12839                         goto out_unlocked;
12840
12841                 }
12842                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12843                     (addr->sa_family == AF_INET6)) {
12844                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12845                         error = EINVAL;
12846                         goto out_unlocked;
12847                 }
12848                 SCTP_INP_WLOCK(inp);
12849                 SCTP_INP_INCR_REF(inp);
12850                 SCTP_INP_WUNLOCK(inp);
12851                 /* With the lock applied look again */
12852                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12853                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12854                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12855                 }
12856                 if (stcb == NULL) {
12857                         SCTP_INP_WLOCK(inp);
12858                         SCTP_INP_DECR_REF(inp);
12859                         SCTP_INP_WUNLOCK(inp);
12860                 } else {
12861                         hold_tcblock = 1;
12862                 }
12863                 if (error) {
12864                         goto out_unlocked;
12865                 }
12866                 if (t_inp != inp) {
12867                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12868                         error = ENOTCONN;
12869                         goto out_unlocked;
12870                 }
12871         }
12872         if (stcb == NULL) {
12873                 if (addr == NULL) {
12874                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12875                         error = ENOENT;
12876                         goto out_unlocked;
12877                 } else {
12878                         /* We must go ahead and start the INIT process */
12879                         uint32_t vrf_id;
12880
12881                         if ((sinfo_flags & SCTP_ABORT) ||
12882                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12883                                 /*-
12884                                  * User asks to abort a non-existant assoc,
12885                                  * or EOF a non-existant assoc with no data
12886                                  */
12887                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12888                                 error = ENOENT;
12889                                 goto out_unlocked;
12890                         }
12891                         /* get an asoc/stcb struct */
12892                         vrf_id = inp->def_vrf_id;
12893 #ifdef INVARIANTS
12894                         if (create_lock_applied == 0) {
12895                                 panic("Error, should hold create lock and I don't?");
12896                         }
12897 #endif
12898                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12899                             p
12900                             );
12901                         if (stcb == NULL) {
12902                                 /* Error is setup for us in the call */
12903                                 goto out_unlocked;
12904                         }
12905                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12906                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12907                                 /*
12908                                  * Set the connected flag so we can queue
12909                                  * data
12910                                  */
12911                                 soisconnecting(so);
12912                         }
12913                         hold_tcblock = 1;
12914                         if (create_lock_applied) {
12915                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12916                                 create_lock_applied = 0;
12917                         } else {
12918                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12919                         }
12920                         /*
12921                          * Turn on queue only flag to prevent data from
12922                          * being sent
12923                          */
12924                         queue_only = 1;
12925                         asoc = &stcb->asoc;
12926                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12927                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12928
12929                         /* initialize authentication params for the assoc */
12930                         sctp_initialize_auth_params(inp, stcb);
12931
12932                         if (control) {
12933                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12934                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12935                                         hold_tcblock = 0;
12936                                         stcb = NULL;
12937                                         goto out_unlocked;
12938                                 }
12939                         }
12940                         /* out with the INIT */
12941                         queue_only_for_init = 1;
12942                         /*-
12943                          * we may want to dig in after this call and adjust the MTU
12944                          * value. It defaulted to 1500 (constant) but the ro
12945                          * structure may now have an update and thus we may need to
12946                          * change it BEFORE we append the message.
12947                          */
12948                 }
12949         } else
12950                 asoc = &stcb->asoc;
12951         if (srcv == NULL)
12952                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12953         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12954                 if (addr)
12955                         net = sctp_findnet(stcb, addr);
12956                 else
12957                         net = NULL;
12958                 if ((net == NULL) ||
12959                     ((port != 0) && (port != stcb->rport))) {
12960                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12961                         error = EINVAL;
12962                         goto out_unlocked;
12963                 }
12964         } else {
12965                 if (stcb->asoc.alternate) {
12966                         net = stcb->asoc.alternate;
12967                 } else {
12968                         net = stcb->asoc.primary_destination;
12969                 }
12970         }
12971         atomic_add_int(&stcb->total_sends, 1);
12972         /* Keep the stcb from being freed under our feet */
12973         atomic_add_int(&asoc->refcnt, 1);
12974         free_cnt_applied = 1;
12975
12976         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12977                 if (sndlen > asoc->smallest_mtu) {
12978                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12979                         error = EMSGSIZE;
12980                         goto out_unlocked;
12981                 }
12982         }
12983         if (SCTP_SO_IS_NBIO(so)
12984             || (flags & MSG_NBIO)
12985             ) {
12986                 non_blocking = 1;
12987         }
12988         /* would we block? */
12989         if (non_blocking) {
12990                 if (hold_tcblock == 0) {
12991                         SCTP_TCB_LOCK(stcb);
12992                         hold_tcblock = 1;
12993                 }
12994                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12995                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12996                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12997                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12998                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12999                                 error = EMSGSIZE;
13000                         else
13001                                 error = EWOULDBLOCK;
13002                         goto out_unlocked;
13003                 }
13004                 stcb->asoc.sb_send_resv += sndlen;
13005                 SCTP_TCB_UNLOCK(stcb);
13006                 hold_tcblock = 0;
13007         } else {
13008                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
13009         }
13010         local_soresv = sndlen;
13011         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13012                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13013                 error = ECONNRESET;
13014                 goto out_unlocked;
13015         }
13016         if (create_lock_applied) {
13017                 SCTP_ASOC_CREATE_UNLOCK(inp);
13018                 create_lock_applied = 0;
13019         }
13020         if (asoc->stream_reset_outstanding) {
13021                 /*
13022                  * Can't queue any data while stream reset is underway.
13023                  */
13024                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
13025                 error = EAGAIN;
13026                 goto out_unlocked;
13027         }
13028         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
13029             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
13030                 queue_only = 1;
13031         }
13032         /* we are now done with all control */
13033         if (control) {
13034                 sctp_m_freem(control);
13035                 control = NULL;
13036         }
13037         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
13038             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
13039             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
13040             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
13041                 if (srcv->sinfo_flags & SCTP_ABORT) {
13042                         ;
13043                 } else {
13044                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13045                         error = ECONNRESET;
13046                         goto out_unlocked;
13047                 }
13048         }
13049         /* Ok, we will attempt a msgsnd :> */
13050         if (p) {
13051                 p->td_ru.ru_msgsnd++;
13052         }
13053         /* Are we aborting? */
13054         if (srcv->sinfo_flags & SCTP_ABORT) {
13055                 struct mbuf *mm;
13056                 int tot_demand, tot_out = 0, max_out;
13057
13058                 SCTP_STAT_INCR(sctps_sends_with_abort);
13059                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
13060                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
13061                         /* It has to be up before we abort */
13062                         /* how big is the user initiated abort? */
13063                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13064                         error = EINVAL;
13065                         goto out;
13066                 }
13067                 if (hold_tcblock) {
13068                         SCTP_TCB_UNLOCK(stcb);
13069                         hold_tcblock = 0;
13070                 }
13071                 if (top) {
13072                         struct mbuf *cntm = NULL;
13073
13074                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
13075                         if (sndlen != 0) {
13076                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
13077                                         tot_out += SCTP_BUF_LEN(cntm);
13078                                 }
13079                         }
13080                 } else {
13081                         /* Must fit in a MTU */
13082                         tot_out = sndlen;
13083                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
13084                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
13085                                 /* To big */
13086                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13087                                 error = EMSGSIZE;
13088                                 goto out;
13089                         }
13090                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
13091                 }
13092                 if (mm == NULL) {
13093                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13094                         error = ENOMEM;
13095                         goto out;
13096                 }
13097                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
13098                 max_out -= sizeof(struct sctp_abort_msg);
13099                 if (tot_out > max_out) {
13100                         tot_out = max_out;
13101                 }
13102                 if (mm) {
13103                         struct sctp_paramhdr *ph;
13104
13105                         /* now move forward the data pointer */
13106                         ph = mtod(mm, struct sctp_paramhdr *);
13107                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
13108                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
13109                         ph++;
13110                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
13111                         if (top == NULL) {
13112                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
13113                                 if (error) {
13114                                         /*-
13115                                          * Here if we can't get his data we
13116                                          * still abort we just don't get to
13117                                          * send the users note :-0
13118                                          */
13119                                         sctp_m_freem(mm);
13120                                         mm = NULL;
13121                                 }
13122                         } else {
13123                                 if (sndlen != 0) {
13124                                         SCTP_BUF_NEXT(mm) = top;
13125                                 }
13126                         }
13127                 }
13128                 if (hold_tcblock == 0) {
13129                         SCTP_TCB_LOCK(stcb);
13130                 }
13131                 atomic_add_int(&stcb->asoc.refcnt, -1);
13132                 free_cnt_applied = 0;
13133                 /* release this lock, otherwise we hang on ourselves */
13134                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13135                 /* now relock the stcb so everything is sane */
13136                 hold_tcblock = 0;
13137                 stcb = NULL;
13138                 /*
13139                  * In this case top is already chained to mm avoid double
13140                  * free, since we free it below if top != NULL and driver
13141                  * would free it after sending the packet out
13142                  */
13143                 if (sndlen != 0) {
13144                         top = NULL;
13145                 }
13146                 goto out_unlocked;
13147         }
13148         /* Calculate the maximum we can send */
13149         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13150         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13151                 if (non_blocking) {
13152                         /* we already checked for non-blocking above. */
13153                         max_len = sndlen;
13154                 } else {
13155                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13156                 }
13157         } else {
13158                 max_len = 0;
13159         }
13160         if (hold_tcblock) {
13161                 SCTP_TCB_UNLOCK(stcb);
13162                 hold_tcblock = 0;
13163         }
13164         /* Is the stream no. valid? */
13165         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
13166                 /* Invalid stream number */
13167                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13168                 error = EINVAL;
13169                 goto out_unlocked;
13170         }
13171         if (asoc->strmout == NULL) {
13172                 /* huh? software error */
13173                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13174                 error = EFAULT;
13175                 goto out_unlocked;
13176         }
13177         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13178         if ((user_marks_eor == 0) &&
13179             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13180                 /* It will NEVER fit */
13181                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13182                 error = EMSGSIZE;
13183                 goto out_unlocked;
13184         }
13185         if ((uio == NULL) && user_marks_eor) {
13186                 /*-
13187                  * We do not support eeor mode for
13188                  * sending with mbuf chains (like sendfile).
13189                  */
13190                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13191                 error = EINVAL;
13192                 goto out_unlocked;
13193         }
13194         if (user_marks_eor) {
13195                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13196         } else {
13197                 /*-
13198                  * For non-eeor the whole message must fit in
13199                  * the socket send buffer.
13200                  */
13201                 local_add_more = sndlen;
13202         }
13203         len = 0;
13204         if (non_blocking) {
13205                 goto skip_preblock;
13206         }
13207         if (((max_len <= local_add_more) &&
13208             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13209             (max_len == 0) ||
13210             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13211                 /* No room right now ! */
13212                 SOCKBUF_LOCK(&so->so_snd);
13213                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13214                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13215                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13216                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13217                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13218                             inqueue_bytes,
13219                             local_add_more,
13220                             stcb->asoc.stream_queue_cnt,
13221                             stcb->asoc.chunks_on_out_queue,
13222                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13223                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13224                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13225                         }
13226                         be.error = 0;
13227                         stcb->block_entry = &be;
13228                         error = sbwait(&so->so_snd);
13229                         stcb->block_entry = NULL;
13230                         if (error || so->so_error || be.error) {
13231                                 if (error == 0) {
13232                                         if (so->so_error)
13233                                                 error = so->so_error;
13234                                         if (be.error) {
13235                                                 error = be.error;
13236                                         }
13237                                 }
13238                                 SOCKBUF_UNLOCK(&so->so_snd);
13239                                 goto out_unlocked;
13240                         }
13241                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13242                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13243                                     asoc, stcb->asoc.total_output_queue_size);
13244                         }
13245                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13246                                 goto out_unlocked;
13247                         }
13248                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13249                 }
13250                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13251                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13252                 } else {
13253                         max_len = 0;
13254                 }
13255                 SOCKBUF_UNLOCK(&so->so_snd);
13256         }
13257 skip_preblock:
13258         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13259                 goto out_unlocked;
13260         }
13261         /*
13262          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13263          * case NOTE: uio will be null when top/mbuf is passed
13264          */
13265         if (sndlen == 0) {
13266                 if (srcv->sinfo_flags & SCTP_EOF) {
13267                         got_all_of_the_send = 1;
13268                         goto dataless_eof;
13269                 } else {
13270                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13271                         error = EINVAL;
13272                         goto out;
13273                 }
13274         }
13275         if (top == NULL) {
13276                 struct sctp_stream_queue_pending *sp;
13277                 struct sctp_stream_out *strm;
13278                 uint32_t sndout;
13279
13280                 SCTP_TCB_SEND_LOCK(stcb);
13281                 if ((asoc->stream_locked) &&
13282                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13283                         SCTP_TCB_SEND_UNLOCK(stcb);
13284                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13285                         error = EINVAL;
13286                         goto out;
13287                 }
13288                 SCTP_TCB_SEND_UNLOCK(stcb);
13289
13290                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13291                 if (strm->last_msg_incomplete == 0) {
13292         do_a_copy_in:
13293                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13294                         if ((sp == NULL) || (error)) {
13295                                 goto out;
13296                         }
13297                         SCTP_TCB_SEND_LOCK(stcb);
13298                         if (sp->msg_is_complete) {
13299                                 strm->last_msg_incomplete = 0;
13300                                 asoc->stream_locked = 0;
13301                         } else {
13302                                 /*
13303                                  * Just got locked to this guy in case of an
13304                                  * interrupt.
13305                                  */
13306                                 strm->last_msg_incomplete = 1;
13307                                 asoc->stream_locked = 1;
13308                                 asoc->stream_locked_on = srcv->sinfo_stream;
13309                                 sp->sender_all_done = 0;
13310                         }
13311                         sctp_snd_sb_alloc(stcb, sp->length);
13312                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13313                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
13314                                 sp->strseq = strm->next_sequence_sent;
13315                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
13316                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
13317                                             (uintptr_t) stcb, sp->length,
13318                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
13319                                 }
13320                                 strm->next_sequence_sent++;
13321                         } else {
13322                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13323                         }
13324                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13325                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13326                         SCTP_TCB_SEND_UNLOCK(stcb);
13327                 } else {
13328                         SCTP_TCB_SEND_LOCK(stcb);
13329                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13330                         SCTP_TCB_SEND_UNLOCK(stcb);
13331                         if (sp == NULL) {
13332                                 /* ???? Huh ??? last msg is gone */
13333 #ifdef INVARIANTS
13334                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13335 #else
13336                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13337                                 strm->last_msg_incomplete = 0;
13338 #endif
13339                                 goto do_a_copy_in;
13340
13341                         }
13342                 }
13343                 while (uio->uio_resid > 0) {
13344                         /* How much room do we have? */
13345                         struct mbuf *new_tail, *mm;
13346
13347                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13348                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13349                         else
13350                                 max_len = 0;
13351
13352                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13353                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13354                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13355                                 sndout = 0;
13356                                 new_tail = NULL;
13357                                 if (hold_tcblock) {
13358                                         SCTP_TCB_UNLOCK(stcb);
13359                                         hold_tcblock = 0;
13360                                 }
13361                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13362                                 if ((mm == NULL) || error) {
13363                                         if (mm) {
13364                                                 sctp_m_freem(mm);
13365                                         }
13366                                         goto out;
13367                                 }
13368                                 /* Update the mbuf and count */
13369                                 SCTP_TCB_SEND_LOCK(stcb);
13370                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13371                                         /*
13372                                          * we need to get out. Peer probably
13373                                          * aborted.
13374                                          */
13375                                         sctp_m_freem(mm);
13376                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13377                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13378                                                 error = ECONNRESET;
13379                                         }
13380                                         SCTP_TCB_SEND_UNLOCK(stcb);
13381                                         goto out;
13382                                 }
13383                                 if (sp->tail_mbuf) {
13384                                         /* tack it to the end */
13385                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13386                                         sp->tail_mbuf = new_tail;
13387                                 } else {
13388                                         /* A stolen mbuf */
13389                                         sp->data = mm;
13390                                         sp->tail_mbuf = new_tail;
13391                                 }
13392                                 sctp_snd_sb_alloc(stcb, sndout);
13393                                 atomic_add_int(&sp->length, sndout);
13394                                 len += sndout;
13395
13396                                 /* Did we reach EOR? */
13397                                 if ((uio->uio_resid == 0) &&
13398                                     ((user_marks_eor == 0) ||
13399                                     (srcv->sinfo_flags & SCTP_EOF) ||
13400                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13401                                         sp->msg_is_complete = 1;
13402                                 } else {
13403                                         sp->msg_is_complete = 0;
13404                                 }
13405                                 SCTP_TCB_SEND_UNLOCK(stcb);
13406                         }
13407                         if (uio->uio_resid == 0) {
13408                                 /* got it all? */
13409                                 continue;
13410                         }
13411                         /* PR-SCTP? */
13412                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
13413                                 /*
13414                                  * This is ugly but we must assure locking
13415                                  * order
13416                                  */
13417                                 if (hold_tcblock == 0) {
13418                                         SCTP_TCB_LOCK(stcb);
13419                                         hold_tcblock = 1;
13420                                 }
13421                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13422                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13423                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13424                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13425                                 else
13426                                         max_len = 0;
13427                                 if (max_len > 0) {
13428                                         continue;
13429                                 }
13430                                 SCTP_TCB_UNLOCK(stcb);
13431                                 hold_tcblock = 0;
13432                         }
13433                         /* wait for space now */
13434                         if (non_blocking) {
13435                                 /* Non-blocking io in place out */
13436                                 goto skip_out_eof;
13437                         }
13438                         /* What about the INIT, send it maybe */
13439                         if (queue_only_for_init) {
13440                                 if (hold_tcblock == 0) {
13441                                         SCTP_TCB_LOCK(stcb);
13442                                         hold_tcblock = 1;
13443                                 }
13444                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13445                                         /* a collision took us forward? */
13446                                         queue_only = 0;
13447                                 } else {
13448                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13449                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13450                                         queue_only = 1;
13451                                 }
13452                         }
13453                         if ((net->flight_size > net->cwnd) &&
13454                             (asoc->sctp_cmt_on_off == 0)) {
13455                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13456                                 queue_only = 1;
13457                         } else if (asoc->ifp_had_enobuf) {
13458                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13459                                 if (net->flight_size > (2 * net->mtu)) {
13460                                         queue_only = 1;
13461                                 }
13462                                 asoc->ifp_had_enobuf = 0;
13463                         }
13464                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13465                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13466                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13467                             (stcb->asoc.total_flight > 0) &&
13468                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13469                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13470
13471                                 /*-
13472                                  * Ok, Nagle is set on and we have data outstanding.
13473                                  * Don't send anything and let SACKs drive out the
13474                                  * data unless wen have a "full" segment to send.
13475                                  */
13476                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13477                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13478                                 }
13479                                 SCTP_STAT_INCR(sctps_naglequeued);
13480                                 nagle_applies = 1;
13481                         } else {
13482                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13483                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13484                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13485                                 }
13486                                 SCTP_STAT_INCR(sctps_naglesent);
13487                                 nagle_applies = 0;
13488                         }
13489                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13490
13491                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13492                                     nagle_applies, un_sent);
13493                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13494                                     stcb->asoc.total_flight,
13495                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13496                         }
13497                         if (queue_only_for_init)
13498                                 queue_only_for_init = 0;
13499                         if ((queue_only == 0) && (nagle_applies == 0)) {
13500                                 /*-
13501                                  * need to start chunk output
13502                                  * before blocking.. note that if
13503                                  * a lock is already applied, then
13504                                  * the input via the net is happening
13505                                  * and I don't need to start output :-D
13506                                  */
13507                                 if (hold_tcblock == 0) {
13508                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13509                                                 hold_tcblock = 1;
13510                                                 sctp_chunk_output(inp,
13511                                                     stcb,
13512                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13513                                         }
13514                                 } else {
13515                                         sctp_chunk_output(inp,
13516                                             stcb,
13517                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13518                                 }
13519                                 if (hold_tcblock == 1) {
13520                                         SCTP_TCB_UNLOCK(stcb);
13521                                         hold_tcblock = 0;
13522                                 }
13523                         }
13524                         SOCKBUF_LOCK(&so->so_snd);
13525                         /*-
13526                          * This is a bit strange, but I think it will
13527                          * work. The total_output_queue_size is locked and
13528                          * protected by the TCB_LOCK, which we just released.
13529                          * There is a race that can occur between releasing it
13530                          * above, and me getting the socket lock, where sacks
13531                          * come in but we have not put the SB_WAIT on the
13532                          * so_snd buffer to get the wakeup. After the LOCK
13533                          * is applied the sack_processing will also need to
13534                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13535                          * once we have the socket buffer lock if we recheck the
13536                          * size we KNOW we will get to sleep safely with the
13537                          * wakeup flag in place.
13538                          */
13539                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13540                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13541                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13542                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13543                                             asoc, uio->uio_resid);
13544                                 }
13545                                 be.error = 0;
13546                                 stcb->block_entry = &be;
13547                                 error = sbwait(&so->so_snd);
13548                                 stcb->block_entry = NULL;
13549
13550                                 if (error || so->so_error || be.error) {
13551                                         if (error == 0) {
13552                                                 if (so->so_error)
13553                                                         error = so->so_error;
13554                                                 if (be.error) {
13555                                                         error = be.error;
13556                                                 }
13557                                         }
13558                                         SOCKBUF_UNLOCK(&so->so_snd);
13559                                         goto out_unlocked;
13560                                 }
13561                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13562                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13563                                             asoc, stcb->asoc.total_output_queue_size);
13564                                 }
13565                         }
13566                         SOCKBUF_UNLOCK(&so->so_snd);
13567                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13568                                 goto out_unlocked;
13569                         }
13570                 }
13571                 SCTP_TCB_SEND_LOCK(stcb);
13572                 if (sp) {
13573                         if (sp->msg_is_complete == 0) {
13574                                 strm->last_msg_incomplete = 1;
13575                                 asoc->stream_locked = 1;
13576                                 asoc->stream_locked_on = srcv->sinfo_stream;
13577                         } else {
13578                                 sp->sender_all_done = 1;
13579                                 strm->last_msg_incomplete = 0;
13580                                 asoc->stream_locked = 0;
13581                         }
13582                 } else {
13583                         SCTP_PRINTF("Huh no sp TSNH?\n");
13584                         strm->last_msg_incomplete = 0;
13585                         asoc->stream_locked = 0;
13586                 }
13587                 SCTP_TCB_SEND_UNLOCK(stcb);
13588                 if (uio->uio_resid == 0) {
13589                         got_all_of_the_send = 1;
13590                 }
13591         } else {
13592                 /* We send in a 0, since we do NOT have any locks */
13593                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13594                 top = NULL;
13595                 if (srcv->sinfo_flags & SCTP_EOF) {
13596                         /*
13597                          * This should only happen for Panda for the mbuf
13598                          * send case, which does NOT yet support EEOR mode.
13599                          * Thus, we can just set this flag to do the proper
13600                          * EOF handling.
13601                          */
13602                         got_all_of_the_send = 1;
13603                 }
13604         }
13605         if (error) {
13606                 goto out;
13607         }
13608 dataless_eof:
13609         /* EOF thing ? */
13610         if ((srcv->sinfo_flags & SCTP_EOF) &&
13611             (got_all_of_the_send == 1)) {
13612                 int cnt;
13613
13614                 SCTP_STAT_INCR(sctps_sends_with_eof);
13615                 error = 0;
13616                 if (hold_tcblock == 0) {
13617                         SCTP_TCB_LOCK(stcb);
13618                         hold_tcblock = 1;
13619                 }
13620                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13621                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13622                     TAILQ_EMPTY(&asoc->sent_queue) &&
13623                     (cnt == 0)) {
13624                         if (asoc->locked_on_sending) {
13625                                 goto abort_anyway;
13626                         }
13627                         /* there is nothing queued to send, so I'm done... */
13628                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13629                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13630                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13631                                 struct sctp_nets *netp;
13632
13633                                 if (stcb->asoc.alternate) {
13634                                         netp = stcb->asoc.alternate;
13635                                 } else {
13636                                         netp = stcb->asoc.primary_destination;
13637                                 }
13638                                 /* only send SHUTDOWN the first time through */
13639                                 sctp_send_shutdown(stcb, netp);
13640                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13641                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13642                                 }
13643                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13644                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13645                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13646                                     netp);
13647                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13648                                     asoc->primary_destination);
13649                         }
13650                 } else {
13651                         /*-
13652                          * we still got (or just got) data to send, so set
13653                          * SHUTDOWN_PENDING
13654                          */
13655                         /*-
13656                          * XXX sockets draft says that SCTP_EOF should be
13657                          * sent with no data.  currently, we will allow user
13658                          * data to be sent first and move to
13659                          * SHUTDOWN-PENDING
13660                          */
13661                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13662                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13663                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13664                                 if (hold_tcblock == 0) {
13665                                         SCTP_TCB_LOCK(stcb);
13666                                         hold_tcblock = 1;
13667                                 }
13668                                 if (asoc->locked_on_sending) {
13669                                         /* Locked to send out the data */
13670                                         struct sctp_stream_queue_pending *sp;
13671
13672                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13673                                         if (sp) {
13674                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13675                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13676                                         }
13677                                 }
13678                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13679                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13680                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13681                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13682                         abort_anyway:
13683                                         if (free_cnt_applied) {
13684                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13685                                                 free_cnt_applied = 0;
13686                                         }
13687                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13688                                             NULL, SCTP_SO_LOCKED);
13689                                         /*
13690                                          * now relock the stcb so everything
13691                                          * is sane
13692                                          */
13693                                         hold_tcblock = 0;
13694                                         stcb = NULL;
13695                                         goto out;
13696                                 }
13697                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13698                                     asoc->primary_destination);
13699                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13700                         }
13701                 }
13702         }
13703 skip_out_eof:
13704         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13705                 some_on_control = 1;
13706         }
13707         if (queue_only_for_init) {
13708                 if (hold_tcblock == 0) {
13709                         SCTP_TCB_LOCK(stcb);
13710                         hold_tcblock = 1;
13711                 }
13712                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13713                         /* a collision took us forward? */
13714                         queue_only = 0;
13715                 } else {
13716                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13717                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13718                         queue_only = 1;
13719                 }
13720         }
13721         if ((net->flight_size > net->cwnd) &&
13722             (stcb->asoc.sctp_cmt_on_off == 0)) {
13723                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13724                 queue_only = 1;
13725         } else if (asoc->ifp_had_enobuf) {
13726                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13727                 if (net->flight_size > (2 * net->mtu)) {
13728                         queue_only = 1;
13729                 }
13730                 asoc->ifp_had_enobuf = 0;
13731         }
13732         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13733             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13734         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13735             (stcb->asoc.total_flight > 0) &&
13736             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13737             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13738                 /*-
13739                  * Ok, Nagle is set on and we have data outstanding.
13740                  * Don't send anything and let SACKs drive out the
13741                  * data unless wen have a "full" segment to send.
13742                  */
13743                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13744                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13745                 }
13746                 SCTP_STAT_INCR(sctps_naglequeued);
13747                 nagle_applies = 1;
13748         } else {
13749                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13750                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13751                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13752                 }
13753                 SCTP_STAT_INCR(sctps_naglesent);
13754                 nagle_applies = 0;
13755         }
13756         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13757                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13758                     nagle_applies, un_sent);
13759                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13760                     stcb->asoc.total_flight,
13761                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13762         }
13763         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13764                 /* we can attempt to send too. */
13765                 if (hold_tcblock == 0) {
13766                         /*
13767                          * If there is activity recv'ing sacks no need to
13768                          * send
13769                          */
13770                         if (SCTP_TCB_TRYLOCK(stcb)) {
13771                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13772                                 hold_tcblock = 1;
13773                         }
13774                 } else {
13775                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13776                 }
13777         } else if ((queue_only == 0) &&
13778                     (stcb->asoc.peers_rwnd == 0) &&
13779             (stcb->asoc.total_flight == 0)) {
13780                 /* We get to have a probe outstanding */
13781                 if (hold_tcblock == 0) {
13782                         hold_tcblock = 1;
13783                         SCTP_TCB_LOCK(stcb);
13784                 }
13785                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13786         } else if (some_on_control) {
13787                 int num_out, reason, frag_point;
13788
13789                 /* Here we do control only */
13790                 if (hold_tcblock == 0) {
13791                         hold_tcblock = 1;
13792                         SCTP_TCB_LOCK(stcb);
13793                 }
13794                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13795                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13796                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13797         }
13798         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13799             queue_only, stcb->asoc.peers_rwnd, un_sent,
13800             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13801             stcb->asoc.total_output_queue_size, error);
13802
13803 out:
13804 out_unlocked:
13805
13806         if (local_soresv && stcb) {
13807                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13808         }
13809         if (create_lock_applied) {
13810                 SCTP_ASOC_CREATE_UNLOCK(inp);
13811         }
13812         if ((stcb) && hold_tcblock) {
13813                 SCTP_TCB_UNLOCK(stcb);
13814         }
13815         if (stcb && free_cnt_applied) {
13816                 atomic_add_int(&stcb->asoc.refcnt, -1);
13817         }
13818 #ifdef INVARIANTS
13819         if (stcb) {
13820                 if (mtx_owned(&stcb->tcb_mtx)) {
13821                         panic("Leaving with tcb mtx owned?");
13822                 }
13823                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13824                         panic("Leaving with tcb send mtx owned?");
13825                 }
13826         }
13827 #endif
13828 #ifdef INVARIANTS
13829         if (inp) {
13830                 sctp_validate_no_locks(inp);
13831         } else {
13832                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13833         }
13834 #endif
13835         if (top) {
13836                 sctp_m_freem(top);
13837         }
13838         if (control) {
13839                 sctp_m_freem(control);
13840         }
13841         return (error);
13842 }
13843
13844
13845 /*
13846  * generate an AUTHentication chunk, if required
13847  */
13848 struct mbuf *
13849 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13850     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13851     struct sctp_tcb *stcb, uint8_t chunk)
13852 {
13853         struct mbuf *m_auth;
13854         struct sctp_auth_chunk *auth;
13855         int chunk_len;
13856         struct mbuf *cn;
13857
13858         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13859             (stcb == NULL))
13860                 return (m);
13861
13862         /* sysctl disabled auth? */
13863         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13864                 return (m);
13865
13866         /* peer doesn't do auth... */
13867         if (!stcb->asoc.peer_supports_auth) {
13868                 return (m);
13869         }
13870         /* does the requested chunk require auth? */
13871         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13872                 return (m);
13873         }
13874         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13875         if (m_auth == NULL) {
13876                 /* no mbuf's */
13877                 return (m);
13878         }
13879         /* reserve some space if this will be the first mbuf */
13880         if (m == NULL)
13881                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13882         /* fill in the AUTH chunk details */
13883         auth = mtod(m_auth, struct sctp_auth_chunk *);
13884         bzero(auth, sizeof(*auth));
13885         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13886         auth->ch.chunk_flags = 0;
13887         chunk_len = sizeof(*auth) +
13888             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13889         auth->ch.chunk_length = htons(chunk_len);
13890         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13891         /* key id and hmac digest will be computed and filled in upon send */
13892
13893         /* save the offset where the auth was inserted into the chain */
13894         *offset = 0;
13895         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13896                 *offset += SCTP_BUF_LEN(cn);
13897         }
13898
13899         /* update length and return pointer to the auth chunk */
13900         SCTP_BUF_LEN(m_auth) = chunk_len;
13901         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13902         if (auth_ret != NULL)
13903                 *auth_ret = auth;
13904
13905         return (m);
13906 }
13907
13908 #ifdef INET6
13909 int
13910 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13911 {
13912         struct nd_prefix *pfx = NULL;
13913         struct nd_pfxrouter *pfxrtr = NULL;
13914         struct sockaddr_in6 gw6;
13915
13916         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13917                 return (0);
13918
13919         /* get prefix entry of address */
13920         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13921                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13922                         continue;
13923                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13924                     &src6->sin6_addr, &pfx->ndpr_mask))
13925                         break;
13926         }
13927         /* no prefix entry in the prefix list */
13928         if (pfx == NULL) {
13929                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13930                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13931                 return (0);
13932         }
13933         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13934         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13935
13936         /* search installed gateway from prefix entry */
13937         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13938                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13939                 gw6.sin6_family = AF_INET6;
13940                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13941                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13942                     sizeof(struct in6_addr));
13943                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13944                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13945                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13946                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13947                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13948                     ro->ro_rt->rt_gateway)) {
13949                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13950                         return (1);
13951                 }
13952         }
13953         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13954         return (0);
13955 }
13956
13957 #endif
13958
13959 int
13960 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13961 {
13962 #ifdef INET
13963         struct sockaddr_in *sin, *mask;
13964         struct ifaddr *ifa;
13965         struct in_addr srcnetaddr, gwnetaddr;
13966
13967         if (ro == NULL || ro->ro_rt == NULL ||
13968             sifa->address.sa.sa_family != AF_INET) {
13969                 return (0);
13970         }
13971         ifa = (struct ifaddr *)sifa->ifa;
13972         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13973         sin = (struct sockaddr_in *)&sifa->address.sin;
13974         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13975         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13976         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13977         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13978
13979         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13980         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13981         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13982         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13983         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13984         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13985                 return (1);
13986         }
13987 #endif
13988         return (0);
13989 }