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, (void *)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", (void *)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", (void *)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(cmh))) {
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(cmh))) < cpsize) {
3390                                         return (found);
3391                                 }
3392                                 /* It is exactly what we want. Copy it out. */
3393                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), 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(cmh))) < sizeof(struct sctp_sndinfo)) {
3408                                                 return (found);
3409                                         }
3410                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), 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(cmh))) < sizeof(struct sctp_prinfo)) {
3419                                                 return (found);
3420                                         }
3421                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), 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(cmh))) < sizeof(struct sctp_authinfo)) {
3427                                                 return (found);
3428                                         }
3429                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), 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(cmh))) {
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(cmh))) < sizeof(struct sctp_initmsg)) {
3483                                         *error = EINVAL;
3484                                         return (1);
3485                                 }
3486                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), 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                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3517                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3518                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3519                                                 stcb->asoc.strmout[i].stream_no = i;
3520                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3521                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3522                                         }
3523                                 }
3524                                 break;
3525 #ifdef INET
3526                         case SCTP_DSTADDRV4:
3527                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3528                                         *error = EINVAL;
3529                                         return (1);
3530                                 }
3531                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3532                                 sin.sin_family = AF_INET;
3533                                 sin.sin_len = sizeof(struct sockaddr_in);
3534                                 sin.sin_port = stcb->rport;
3535                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3536                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3537                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3538                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3539                                         *error = EINVAL;
3540                                         return (1);
3541                                 }
3542                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3543                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3544                                         *error = ENOBUFS;
3545                                         return (1);
3546                                 }
3547                                 break;
3548 #endif
3549 #ifdef INET6
3550                         case SCTP_DSTADDRV6:
3551                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3552                                         *error = EINVAL;
3553                                         return (1);
3554                                 }
3555                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3556                                 sin6.sin6_family = AF_INET6;
3557                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3558                                 sin6.sin6_port = stcb->rport;
3559                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3560                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3561                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3562                                         *error = EINVAL;
3563                                         return (1);
3564                                 }
3565 #ifdef INET
3566                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3567                                         in6_sin6_2_sin(&sin, &sin6);
3568                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3569                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3570                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3571                                                 *error = EINVAL;
3572                                                 return (1);
3573                                         }
3574                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3575                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3576                                                 *error = ENOBUFS;
3577                                                 return (1);
3578                                         }
3579                                 } else
3580 #endif
3581                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3582                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3583                                         *error = ENOBUFS;
3584                                         return (1);
3585                                 }
3586                                 break;
3587 #endif
3588                         default:
3589                                 break;
3590                         }
3591                 }
3592                 at += CMSG_ALIGN(cmh.cmsg_len);
3593         }
3594         return (0);
3595 }
3596
3597 static struct sctp_tcb *
3598 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3599     in_port_t port,
3600     struct mbuf *control,
3601     struct sctp_nets **net_p,
3602     int *error)
3603 {
3604         struct cmsghdr cmh;
3605         int tlen, at;
3606         struct sctp_tcb *stcb;
3607         struct sockaddr *addr;
3608
3609 #ifdef INET
3610         struct sockaddr_in sin;
3611
3612 #endif
3613 #ifdef INET6
3614         struct sockaddr_in6 sin6;
3615
3616 #endif
3617
3618         tlen = SCTP_BUF_LEN(control);
3619         at = 0;
3620         while (at < tlen) {
3621                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3622                         /* There is not enough room for one more. */
3623                         *error = EINVAL;
3624                         return (NULL);
3625                 }
3626                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3627                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3628                         /* We dont't have a complete CMSG header. */
3629                         *error = EINVAL;
3630                         return (NULL);
3631                 }
3632                 if (((int)cmh.cmsg_len + at) > tlen) {
3633                         /* We don't have the complete CMSG. */
3634                         *error = EINVAL;
3635                         return (NULL);
3636                 }
3637                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3638                         switch (cmh.cmsg_type) {
3639 #ifdef INET
3640                         case SCTP_DSTADDRV4:
3641                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3642                                         *error = EINVAL;
3643                                         return (NULL);
3644                                 }
3645                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3646                                 sin.sin_family = AF_INET;
3647                                 sin.sin_len = sizeof(struct sockaddr_in);
3648                                 sin.sin_port = port;
3649                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3650                                 addr = (struct sockaddr *)&sin;
3651                                 break;
3652 #endif
3653 #ifdef INET6
3654                         case SCTP_DSTADDRV6:
3655                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3656                                         *error = EINVAL;
3657                                         return (NULL);
3658                                 }
3659                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3660                                 sin6.sin6_family = AF_INET6;
3661                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3662                                 sin6.sin6_port = port;
3663                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3664 #ifdef INET
3665                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3666                                         in6_sin6_2_sin(&sin, &sin6);
3667                                         addr = (struct sockaddr *)&sin;
3668                                 } else
3669 #endif
3670                                         addr = (struct sockaddr *)&sin6;
3671                                 break;
3672 #endif
3673                         default:
3674                                 addr = NULL;
3675                                 break;
3676                         }
3677                         if (addr) {
3678                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3679                                 if (stcb != NULL) {
3680                                         return (stcb);
3681                                 }
3682                         }
3683                 }
3684                 at += CMSG_ALIGN(cmh.cmsg_len);
3685         }
3686         return (NULL);
3687 }
3688
3689 static struct mbuf *
3690 sctp_add_cookie(struct mbuf *init, int init_offset,
3691     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3692 {
3693         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3694         struct sctp_state_cookie *stc;
3695         struct sctp_paramhdr *ph;
3696         uint8_t *foo;
3697         int sig_offset;
3698         uint16_t cookie_sz;
3699
3700         mret = NULL;
3701         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3702             sizeof(struct sctp_paramhdr)), 0,
3703             M_DONTWAIT, 1, MT_DATA);
3704         if (mret == NULL) {
3705                 return (NULL);
3706         }
3707         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3708         if (copy_init == NULL) {
3709                 sctp_m_freem(mret);
3710                 return (NULL);
3711         }
3712 #ifdef SCTP_MBUF_LOGGING
3713         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3714                 struct mbuf *mat;
3715
3716                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3717                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3718                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3719                         }
3720                 }
3721         }
3722 #endif
3723         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3724             M_DONTWAIT);
3725         if (copy_initack == NULL) {
3726                 sctp_m_freem(mret);
3727                 sctp_m_freem(copy_init);
3728                 return (NULL);
3729         }
3730 #ifdef SCTP_MBUF_LOGGING
3731         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3732                 struct mbuf *mat;
3733
3734                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3735                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3736                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3737                         }
3738                 }
3739         }
3740 #endif
3741         /* easy side we just drop it on the end */
3742         ph = mtod(mret, struct sctp_paramhdr *);
3743         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3744             sizeof(struct sctp_paramhdr);
3745         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3746             sizeof(struct sctp_paramhdr));
3747         ph->param_type = htons(SCTP_STATE_COOKIE);
3748         ph->param_length = 0;   /* fill in at the end */
3749         /* Fill in the stc cookie data */
3750         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3751
3752         /* tack the INIT and then the INIT-ACK onto the chain */
3753         cookie_sz = 0;
3754         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3755                 cookie_sz += SCTP_BUF_LEN(m_at);
3756                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3757                         SCTP_BUF_NEXT(m_at) = copy_init;
3758                         break;
3759                 }
3760         }
3761         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3762                 cookie_sz += SCTP_BUF_LEN(m_at);
3763                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3764                         SCTP_BUF_NEXT(m_at) = copy_initack;
3765                         break;
3766                 }
3767         }
3768         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3769                 cookie_sz += SCTP_BUF_LEN(m_at);
3770                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3771                         break;
3772                 }
3773         }
3774         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3775         if (sig == NULL) {
3776                 /* no space, so free the entire chain */
3777                 sctp_m_freem(mret);
3778                 return (NULL);
3779         }
3780         SCTP_BUF_LEN(sig) = 0;
3781         SCTP_BUF_NEXT(m_at) = sig;
3782         sig_offset = 0;
3783         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3784         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3785         *signature = foo;
3786         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3787         cookie_sz += SCTP_SIGNATURE_SIZE;
3788         ph->param_length = htons(cookie_sz);
3789         return (mret);
3790 }
3791
3792
3793 static uint8_t
3794 sctp_get_ect(struct sctp_tcb *stcb)
3795 {
3796         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3797                 return (SCTP_ECT0_BIT);
3798         } else {
3799                 return (0);
3800         }
3801 }
3802
3803 #if defined(INET) || defined(INET6)
3804 static void
3805 sctp_handle_no_route(struct sctp_tcb *stcb,
3806     struct sctp_nets *net,
3807     int so_locked)
3808 {
3809         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3810
3811         if (net) {
3812                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3813                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3814                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3815                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3816                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3817                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3818                                     stcb, 0,
3819                                     (void *)net,
3820                                     so_locked);
3821                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3822                                 net->dest_state &= ~SCTP_ADDR_PF;
3823                         }
3824                 }
3825                 if (stcb) {
3826                         if (net == stcb->asoc.primary_destination) {
3827                                 /* need a new primary */
3828                                 struct sctp_nets *alt;
3829
3830                                 alt = sctp_find_alternate_net(stcb, net, 0);
3831                                 if (alt != net) {
3832                                         if (stcb->asoc.alternate) {
3833                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3834                                         }
3835                                         stcb->asoc.alternate = alt;
3836                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3837                                         if (net->ro._s_addr) {
3838                                                 sctp_free_ifa(net->ro._s_addr);
3839                                                 net->ro._s_addr = NULL;
3840                                         }
3841                                         net->src_addr_selected = 0;
3842                                 }
3843                         }
3844                 }
3845         }
3846 }
3847
3848 #endif
3849
3850 static int
3851 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3852     struct sctp_tcb *stcb,      /* may be NULL */
3853     struct sctp_nets *net,
3854     struct sockaddr *to,
3855     struct mbuf *m,
3856     uint32_t auth_offset,
3857     struct sctp_auth_chunk *auth,
3858     uint16_t auth_keyid,
3859     int nofragment_flag,
3860     int ecn_ok,
3861     int out_of_asoc_ok,
3862     uint16_t src_port,
3863     uint16_t dest_port,
3864     uint32_t v_tag,
3865     uint16_t port,
3866     union sctp_sockstore *over_addr,
3867     uint8_t use_mflowid, uint32_t mflowid,
3868 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3869     int so_locked SCTP_UNUSED
3870 #else
3871     int so_locked
3872 #endif
3873 )
3874 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3875 {
3876         /**
3877          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3878          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3879          * - fill in the HMAC digest of any AUTH chunk in the packet.
3880          * - calculate and fill in the SCTP checksum.
3881          * - prepend an IP address header.
3882          * - if boundall use INADDR_ANY.
3883          * - if boundspecific do source address selection.
3884          * - set fragmentation option for ipV4.
3885          * - On return from IP output, check/adjust mtu size of output
3886          *   interface and smallest_mtu size as well.
3887          */
3888         /* Will need ifdefs around this */
3889         struct mbuf *newm;
3890         struct sctphdr *sctphdr;
3891         int packet_length;
3892         int ret;
3893         uint32_t vrf_id;
3894
3895 #if defined(INET) || defined(INET6)
3896         struct mbuf *o_pak;
3897         sctp_route_t *ro = NULL;
3898         struct udphdr *udp = NULL;
3899
3900 #endif
3901         uint8_t tos_value;
3902
3903 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3904         struct socket *so = NULL;
3905
3906 #endif
3907
3908         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3909                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3910                 sctp_m_freem(m);
3911                 return (EFAULT);
3912         }
3913         if (stcb) {
3914                 vrf_id = stcb->asoc.vrf_id;
3915         } else {
3916                 vrf_id = inp->def_vrf_id;
3917         }
3918
3919         /* fill in the HMAC digest for any AUTH chunk in the packet */
3920         if ((auth != NULL) && (stcb != NULL)) {
3921                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3922         }
3923         if (net) {
3924                 tos_value = net->dscp;
3925         } else if (stcb) {
3926                 tos_value = stcb->asoc.default_dscp;
3927         } else {
3928                 tos_value = inp->sctp_ep.default_dscp;
3929         }
3930
3931         switch (to->sa_family) {
3932 #ifdef INET
3933         case AF_INET:
3934                 {
3935                         struct ip *ip = NULL;
3936                         sctp_route_t iproute;
3937                         int len;
3938
3939                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3940                         if (port) {
3941                                 len += sizeof(struct udphdr);
3942                         }
3943                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3944                         if (newm == NULL) {
3945                                 sctp_m_freem(m);
3946                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3947                                 return (ENOMEM);
3948                         }
3949                         SCTP_ALIGN_TO_END(newm, len);
3950                         SCTP_BUF_LEN(newm) = len;
3951                         SCTP_BUF_NEXT(newm) = m;
3952                         m = newm;
3953                         if (net != NULL) {
3954 #ifdef INVARIANTS
3955                                 if (net->flowidset == 0) {
3956                                         panic("Flow ID not set");
3957                                 }
3958 #endif
3959                                 m->m_pkthdr.flowid = net->flowid;
3960                                 m->m_flags |= M_FLOWID;
3961                         } else {
3962                                 if (use_mflowid != 0) {
3963                                         m->m_pkthdr.flowid = mflowid;
3964                                         m->m_flags |= M_FLOWID;
3965                                 }
3966                         }
3967                         packet_length = sctp_calculate_len(m);
3968                         ip = mtod(m, struct ip *);
3969                         ip->ip_v = IPVERSION;
3970                         ip->ip_hl = (sizeof(struct ip) >> 2);
3971                         if (tos_value == 0) {
3972                                 /*
3973                                  * This means especially, that it is not set
3974                                  * at the SCTP layer. So use the value from
3975                                  * the IP layer.
3976                                  */
3977                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3978                         }
3979                         tos_value &= 0xfc;
3980                         if (ecn_ok) {
3981                                 tos_value |= sctp_get_ect(stcb);
3982                         }
3983                         if ((nofragment_flag) && (port == 0)) {
3984                                 ip->ip_off = IP_DF;
3985                         } else {
3986                                 ip->ip_off = 0;
3987                         }
3988                         /* FreeBSD has a function for ip_id's */
3989                         ip->ip_id = ip_newid();
3990
3991                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3992                         ip->ip_len = packet_length;
3993                         ip->ip_tos = tos_value;
3994                         if (port) {
3995                                 ip->ip_p = IPPROTO_UDP;
3996                         } else {
3997                                 ip->ip_p = IPPROTO_SCTP;
3998                         }
3999                         ip->ip_sum = 0;
4000                         if (net == NULL) {
4001                                 ro = &iproute;
4002                                 memset(&iproute, 0, sizeof(iproute));
4003                                 memcpy(&ro->ro_dst, to, to->sa_len);
4004                         } else {
4005                                 ro = (sctp_route_t *) & net->ro;
4006                         }
4007                         /* Now the address selection part */
4008                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4009
4010                         /* call the routine to select the src address */
4011                         if (net && out_of_asoc_ok == 0) {
4012                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4013                                         sctp_free_ifa(net->ro._s_addr);
4014                                         net->ro._s_addr = NULL;
4015                                         net->src_addr_selected = 0;
4016                                         if (ro->ro_rt) {
4017                                                 RTFREE(ro->ro_rt);
4018                                                 ro->ro_rt = NULL;
4019                                         }
4020                                 }
4021                                 if (net->src_addr_selected == 0) {
4022                                         /* Cache the source address */
4023                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4024                                             ro, net, 0,
4025                                             vrf_id);
4026                                         net->src_addr_selected = 1;
4027                                 }
4028                                 if (net->ro._s_addr == NULL) {
4029                                         /* No route to host */
4030                                         net->src_addr_selected = 0;
4031                                         sctp_handle_no_route(stcb, net, so_locked);
4032                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4033                                         sctp_m_freem(m);
4034                                         return (EHOSTUNREACH);
4035                                 }
4036                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4037                         } else {
4038                                 if (over_addr == NULL) {
4039                                         struct sctp_ifa *_lsrc;
4040
4041                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4042                                             net,
4043                                             out_of_asoc_ok,
4044                                             vrf_id);
4045                                         if (_lsrc == NULL) {
4046                                                 sctp_handle_no_route(stcb, net, so_locked);
4047                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4048                                                 sctp_m_freem(m);
4049                                                 return (EHOSTUNREACH);
4050                                         }
4051                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4052                                         sctp_free_ifa(_lsrc);
4053                                 } else {
4054                                         ip->ip_src = over_addr->sin.sin_addr;
4055                                         SCTP_RTALLOC(ro, vrf_id);
4056                                 }
4057                         }
4058                         if (port) {
4059                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4060                                         sctp_handle_no_route(stcb, net, so_locked);
4061                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4062                                         sctp_m_freem(m);
4063                                         return (EHOSTUNREACH);
4064                                 }
4065                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4066                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4067                                 udp->uh_dport = port;
4068                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4069                                 if (V_udp_cksum) {
4070                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4071                                 } else {
4072                                         udp->uh_sum = 0;
4073                                 }
4074                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4075                         } else {
4076                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4077                         }
4078
4079                         sctphdr->src_port = src_port;
4080                         sctphdr->dest_port = dest_port;
4081                         sctphdr->v_tag = v_tag;
4082                         sctphdr->checksum = 0;
4083
4084                         /*
4085                          * If source address selection fails and we find no
4086                          * route then the ip_output should fail as well with
4087                          * a NO_ROUTE_TO_HOST type error. We probably should
4088                          * catch that somewhere and abort the association
4089                          * right away (assuming this is an INIT being sent).
4090                          */
4091                         if (ro->ro_rt == NULL) {
4092                                 /*
4093                                  * src addr selection failed to find a route
4094                                  * (or valid source addr), so we can't get
4095                                  * there from here (yet)!
4096                                  */
4097                                 sctp_handle_no_route(stcb, net, so_locked);
4098                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4099                                 sctp_m_freem(m);
4100                                 return (EHOSTUNREACH);
4101                         }
4102                         if (ro != &iproute) {
4103                                 memcpy(&iproute, ro, sizeof(*ro));
4104                         }
4105                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4106                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4107                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4108                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4109                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4110                             (void *)ro->ro_rt);
4111
4112                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4113                                 /* failed to prepend data, give up */
4114                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4115                                 sctp_m_freem(m);
4116                                 return (ENOMEM);
4117                         }
4118                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4119                         if (port) {
4120 #if defined(SCTP_WITH_NO_CSUM)
4121                                 SCTP_STAT_INCR(sctps_sendnocrc);
4122 #else
4123                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4124                                 SCTP_STAT_INCR(sctps_sendswcrc);
4125 #endif
4126                                 if (V_udp_cksum) {
4127                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4128                                 }
4129                         } else {
4130 #if defined(SCTP_WITH_NO_CSUM)
4131                                 SCTP_STAT_INCR(sctps_sendnocrc);
4132 #else
4133                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4134                                 m->m_pkthdr.csum_data = 0;
4135                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4136 #endif
4137                         }
4138 #ifdef SCTP_PACKET_LOGGING
4139                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4140                                 sctp_packet_log(o_pak);
4141 #endif
4142                         /* send it out.  table id is taken from stcb */
4143 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4144                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4145                                 so = SCTP_INP_SO(inp);
4146                                 SCTP_SOCKET_UNLOCK(so, 0);
4147                         }
4148 #endif
4149                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4150 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4151                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4152                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4153                                 SCTP_TCB_UNLOCK(stcb);
4154                                 SCTP_SOCKET_LOCK(so, 0);
4155                                 SCTP_TCB_LOCK(stcb);
4156                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4157                         }
4158 #endif
4159                         SCTP_STAT_INCR(sctps_sendpackets);
4160                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4161                         if (ret)
4162                                 SCTP_STAT_INCR(sctps_senderrors);
4163
4164                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4165                         if (net == NULL) {
4166                                 /* free tempy routes */
4167                                 if (ro->ro_rt) {
4168                                         RTFREE(ro->ro_rt);
4169                                         ro->ro_rt = NULL;
4170                                 }
4171                         } else {
4172                                 /*
4173                                  * PMTU check versus smallest asoc MTU goes
4174                                  * here
4175                                  */
4176                                 if ((ro->ro_rt != NULL) &&
4177                                     (net->ro._s_addr)) {
4178                                         uint32_t mtu;
4179
4180                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4181                                         if (net->port) {
4182                                                 mtu -= sizeof(struct udphdr);
4183                                         }
4184                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4185                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4186                                                 net->mtu = mtu;
4187                                         }
4188                                 } else if (ro->ro_rt == NULL) {
4189                                         /* route was freed */
4190                                         if (net->ro._s_addr &&
4191                                             net->src_addr_selected) {
4192                                                 sctp_free_ifa(net->ro._s_addr);
4193                                                 net->ro._s_addr = NULL;
4194                                         }
4195                                         net->src_addr_selected = 0;
4196                                 }
4197                         }
4198                         return (ret);
4199                 }
4200 #endif
4201 #ifdef INET6
4202         case AF_INET6:
4203                 {
4204                         uint32_t flowlabel, flowinfo;
4205                         struct ip6_hdr *ip6h;
4206                         struct route_in6 ip6route;
4207                         struct ifnet *ifp;
4208                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4209                         int prev_scope = 0;
4210                         struct sockaddr_in6 lsa6_storage;
4211                         int error;
4212                         u_short prev_port = 0;
4213                         int len;
4214
4215                         if (net) {
4216                                 flowlabel = net->flowlabel;
4217                         } else if (stcb) {
4218                                 flowlabel = stcb->asoc.default_flowlabel;
4219                         } else {
4220                                 flowlabel = inp->sctp_ep.default_flowlabel;
4221                         }
4222                         if (flowlabel == 0) {
4223                                 /*
4224                                  * This means especially, that it is not set
4225                                  * at the SCTP layer. So use the value from
4226                                  * the IP layer.
4227                                  */
4228                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4229                         }
4230                         flowlabel &= 0x000fffff;
4231                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4232                         if (port) {
4233                                 len += sizeof(struct udphdr);
4234                         }
4235                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4236                         if (newm == NULL) {
4237                                 sctp_m_freem(m);
4238                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4239                                 return (ENOMEM);
4240                         }
4241                         SCTP_ALIGN_TO_END(newm, len);
4242                         SCTP_BUF_LEN(newm) = len;
4243                         SCTP_BUF_NEXT(newm) = m;
4244                         m = newm;
4245                         if (net != NULL) {
4246 #ifdef INVARIANTS
4247                                 if (net->flowidset == 0) {
4248                                         panic("Flow ID not set");
4249                                 }
4250 #endif
4251                                 m->m_pkthdr.flowid = net->flowid;
4252                                 m->m_flags |= M_FLOWID;
4253                         } else {
4254                                 if (use_mflowid != 0) {
4255                                         m->m_pkthdr.flowid = mflowid;
4256                                         m->m_flags |= M_FLOWID;
4257                                 }
4258                         }
4259                         packet_length = sctp_calculate_len(m);
4260
4261                         ip6h = mtod(m, struct ip6_hdr *);
4262                         /* protect *sin6 from overwrite */
4263                         sin6 = (struct sockaddr_in6 *)to;
4264                         tmp = *sin6;
4265                         sin6 = &tmp;
4266
4267                         /* KAME hack: embed scopeid */
4268                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4269                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4270                                 return (EINVAL);
4271                         }
4272                         if (net == NULL) {
4273                                 memset(&ip6route, 0, sizeof(ip6route));
4274                                 ro = (sctp_route_t *) & ip6route;
4275                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4276                         } else {
4277                                 ro = (sctp_route_t *) & net->ro;
4278                         }
4279                         /*
4280                          * We assume here that inp_flow is in host byte
4281                          * order within the TCB!
4282                          */
4283                         if (tos_value == 0) {
4284                                 /*
4285                                  * This means especially, that it is not set
4286                                  * at the SCTP layer. So use the value from
4287                                  * the IP layer.
4288                                  */
4289                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4290                         }
4291                         tos_value &= 0xfc;
4292                         if (ecn_ok) {
4293                                 tos_value |= sctp_get_ect(stcb);
4294                         }
4295                         flowinfo = 0x06;
4296                         flowinfo <<= 8;
4297                         flowinfo |= tos_value;
4298                         flowinfo <<= 20;
4299                         flowinfo |= flowlabel;
4300                         ip6h->ip6_flow = htonl(flowinfo);
4301                         if (port) {
4302                                 ip6h->ip6_nxt = IPPROTO_UDP;
4303                         } else {
4304                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4305                         }
4306                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4307                         ip6h->ip6_dst = sin6->sin6_addr;
4308
4309                         /*
4310                          * Add SRC address selection here: we can only reuse
4311                          * to a limited degree the kame src-addr-sel, since
4312                          * we can try their selection but it may not be
4313                          * bound.
4314                          */
4315                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4316                         lsa6_tmp.sin6_family = AF_INET6;
4317                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4318                         lsa6 = &lsa6_tmp;
4319                         if (net && out_of_asoc_ok == 0) {
4320                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4321                                         sctp_free_ifa(net->ro._s_addr);
4322                                         net->ro._s_addr = NULL;
4323                                         net->src_addr_selected = 0;
4324                                         if (ro->ro_rt) {
4325                                                 RTFREE(ro->ro_rt);
4326                                                 ro->ro_rt = NULL;
4327                                         }
4328                                 }
4329                                 if (net->src_addr_selected == 0) {
4330                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4331                                         /* KAME hack: embed scopeid */
4332                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4333                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4334                                                 return (EINVAL);
4335                                         }
4336                                         /* Cache the source address */
4337                                         net->ro._s_addr = sctp_source_address_selection(inp,
4338                                             stcb,
4339                                             ro,
4340                                             net,
4341                                             0,
4342                                             vrf_id);
4343                                         (void)sa6_recoverscope(sin6);
4344                                         net->src_addr_selected = 1;
4345                                 }
4346                                 if (net->ro._s_addr == NULL) {
4347                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4348                                         net->src_addr_selected = 0;
4349                                         sctp_handle_no_route(stcb, net, so_locked);
4350                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4351                                         sctp_m_freem(m);
4352                                         return (EHOSTUNREACH);
4353                                 }
4354                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4355                         } else {
4356                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4357                                 /* KAME hack: embed scopeid */
4358                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4359                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4360                                         return (EINVAL);
4361                                 }
4362                                 if (over_addr == NULL) {
4363                                         struct sctp_ifa *_lsrc;
4364
4365                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4366                                             net,
4367                                             out_of_asoc_ok,
4368                                             vrf_id);
4369                                         if (_lsrc == NULL) {
4370                                                 sctp_handle_no_route(stcb, net, so_locked);
4371                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4372                                                 sctp_m_freem(m);
4373                                                 return (EHOSTUNREACH);
4374                                         }
4375                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4376                                         sctp_free_ifa(_lsrc);
4377                                 } else {
4378                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4379                                         SCTP_RTALLOC(ro, vrf_id);
4380                                 }
4381                                 (void)sa6_recoverscope(sin6);
4382                         }
4383                         lsa6->sin6_port = inp->sctp_lport;
4384
4385                         if (ro->ro_rt == NULL) {
4386                                 /*
4387                                  * src addr selection failed to find a route
4388                                  * (or valid source addr), so we can't get
4389                                  * there from here!
4390                                  */
4391                                 sctp_handle_no_route(stcb, net, so_locked);
4392                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4393                                 sctp_m_freem(m);
4394                                 return (EHOSTUNREACH);
4395                         }
4396                         /*
4397                          * XXX: sa6 may not have a valid sin6_scope_id in
4398                          * the non-SCOPEDROUTING case.
4399                          */
4400                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4401                         lsa6_storage.sin6_family = AF_INET6;
4402                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4403                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4404                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4405                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4406                                 sctp_m_freem(m);
4407                                 return (error);
4408                         }
4409                         /* XXX */
4410                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4411                         lsa6_storage.sin6_port = inp->sctp_lport;
4412                         lsa6 = &lsa6_storage;
4413                         ip6h->ip6_src = lsa6->sin6_addr;
4414
4415                         if (port) {
4416                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4417                                         sctp_handle_no_route(stcb, net, so_locked);
4418                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4419                                         sctp_m_freem(m);
4420                                         return (EHOSTUNREACH);
4421                                 }
4422                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4423                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4424                                 udp->uh_dport = port;
4425                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4426                                 udp->uh_sum = 0;
4427                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4428                         } else {
4429                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4430                         }
4431
4432                         sctphdr->src_port = src_port;
4433                         sctphdr->dest_port = dest_port;
4434                         sctphdr->v_tag = v_tag;
4435                         sctphdr->checksum = 0;
4436
4437                         /*
4438                          * We set the hop limit now since there is a good
4439                          * chance that our ro pointer is now filled
4440                          */
4441                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4442                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4443
4444 #ifdef SCTP_DEBUG
4445                         /* Copy to be sure something bad is not happening */
4446                         sin6->sin6_addr = ip6h->ip6_dst;
4447                         lsa6->sin6_addr = ip6h->ip6_src;
4448 #endif
4449
4450                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4451                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4452                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4453                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4454                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4455                         if (net) {
4456                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4457                                 /*
4458                                  * preserve the port and scope for link
4459                                  * local send
4460                                  */
4461                                 prev_scope = sin6->sin6_scope_id;
4462                                 prev_port = sin6->sin6_port;
4463                         }
4464                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4465                                 /* failed to prepend data, give up */
4466                                 sctp_m_freem(m);
4467                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4468                                 return (ENOMEM);
4469                         }
4470                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4471                         if (port) {
4472 #if defined(SCTP_WITH_NO_CSUM)
4473                                 SCTP_STAT_INCR(sctps_sendnocrc);
4474 #else
4475                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4476                                 SCTP_STAT_INCR(sctps_sendswcrc);
4477 #endif
4478                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4479                                         udp->uh_sum = 0xffff;
4480                                 }
4481                         } else {
4482 #if defined(SCTP_WITH_NO_CSUM)
4483                                 SCTP_STAT_INCR(sctps_sendnocrc);
4484 #else
4485                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4486                                 m->m_pkthdr.csum_data = 0;
4487                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4488 #endif
4489                         }
4490                         /* send it out. table id is taken from stcb */
4491 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4492                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4493                                 so = SCTP_INP_SO(inp);
4494                                 SCTP_SOCKET_UNLOCK(so, 0);
4495                         }
4496 #endif
4497 #ifdef SCTP_PACKET_LOGGING
4498                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4499                                 sctp_packet_log(o_pak);
4500 #endif
4501                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4502 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4503                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4504                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4505                                 SCTP_TCB_UNLOCK(stcb);
4506                                 SCTP_SOCKET_LOCK(so, 0);
4507                                 SCTP_TCB_LOCK(stcb);
4508                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4509                         }
4510 #endif
4511                         if (net) {
4512                                 /* for link local this must be done */
4513                                 sin6->sin6_scope_id = prev_scope;
4514                                 sin6->sin6_port = prev_port;
4515                         }
4516                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4517                         SCTP_STAT_INCR(sctps_sendpackets);
4518                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4519                         if (ret) {
4520                                 SCTP_STAT_INCR(sctps_senderrors);
4521                         }
4522                         if (net == NULL) {
4523                                 /* Now if we had a temp route free it */
4524                                 if (ro->ro_rt) {
4525                                         RTFREE(ro->ro_rt);
4526                                 }
4527                         } else {
4528                                 /*
4529                                  * PMTU check versus smallest asoc MTU goes
4530                                  * here
4531                                  */
4532                                 if (ro->ro_rt == NULL) {
4533                                         /* Route was freed */
4534                                         if (net->ro._s_addr &&
4535                                             net->src_addr_selected) {
4536                                                 sctp_free_ifa(net->ro._s_addr);
4537                                                 net->ro._s_addr = NULL;
4538                                         }
4539                                         net->src_addr_selected = 0;
4540                                 }
4541                                 if ((ro->ro_rt != NULL) &&
4542                                     (net->ro._s_addr)) {
4543                                         uint32_t mtu;
4544
4545                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4546                                         if (mtu &&
4547                                             (stcb->asoc.smallest_mtu > mtu)) {
4548                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4549                                                 net->mtu = mtu;
4550                                                 if (net->port) {
4551                                                         net->mtu -= sizeof(struct udphdr);
4552                                                 }
4553                                         }
4554                                 } else if (ifp) {
4555                                         if (ND_IFINFO(ifp)->linkmtu &&
4556                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4557                                                 sctp_mtu_size_reset(inp,
4558                                                     &stcb->asoc,
4559                                                     ND_IFINFO(ifp)->linkmtu);
4560                                         }
4561                                 }
4562                         }
4563                         return (ret);
4564                 }
4565 #endif
4566         default:
4567                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4568                     ((struct sockaddr *)to)->sa_family);
4569                 sctp_m_freem(m);
4570                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4571                 return (EFAULT);
4572         }
4573 }
4574
4575
4576 void
4577 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4578 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4579     SCTP_UNUSED
4580 #endif
4581 )
4582 {
4583         struct mbuf *m, *m_at, *mp_last;
4584         struct sctp_nets *net;
4585         struct sctp_init_chunk *init;
4586         struct sctp_supported_addr_param *sup_addr;
4587         struct sctp_adaptation_layer_indication *ali;
4588         struct sctp_ecn_supported_param *ecn;
4589         struct sctp_prsctp_supported_param *prsctp;
4590         struct sctp_supported_chunk_types_param *pr_supported;
4591         int cnt_inits_to = 0;
4592         int padval, ret;
4593         int num_ext;
4594         int p_len;
4595
4596         /* INIT's always go to the primary (and usually ONLY address) */
4597         mp_last = NULL;
4598         net = stcb->asoc.primary_destination;
4599         if (net == NULL) {
4600                 net = TAILQ_FIRST(&stcb->asoc.nets);
4601                 if (net == NULL) {
4602                         /* TSNH */
4603                         return;
4604                 }
4605                 /* we confirm any address we send an INIT to */
4606                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4607                 (void)sctp_set_primary_addr(stcb, NULL, net);
4608         } else {
4609                 /* we confirm any address we send an INIT to */
4610                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4611         }
4612         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4613 #ifdef INET6
4614         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4615                 /*
4616                  * special hook, if we are sending to link local it will not
4617                  * show up in our private address count.
4618                  */
4619                 struct sockaddr_in6 *sin6l;
4620
4621                 sin6l = &net->ro._l_addr.sin6;
4622                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4623                         cnt_inits_to = 1;
4624         }
4625 #endif
4626         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4627                 /* This case should not happen */
4628                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4629                 return;
4630         }
4631         /* start the INIT timer */
4632         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4633
4634         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4635         if (m == NULL) {
4636                 /* No memory, INIT timer will re-attempt. */
4637                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4638                 return;
4639         }
4640         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4641         /*
4642          * assume peer supports asconf in order to be able to queue local
4643          * address changes while an INIT is in flight and before the assoc
4644          * is established.
4645          */
4646         stcb->asoc.peer_supports_asconf = 1;
4647         /* Now lets put the SCTP header in place */
4648         init = mtod(m, struct sctp_init_chunk *);
4649         /* now the chunk header */
4650         init->ch.chunk_type = SCTP_INITIATION;
4651         init->ch.chunk_flags = 0;
4652         /* fill in later from mbuf we build */
4653         init->ch.chunk_length = 0;
4654         /* place in my tag */
4655         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4656         /* set up some of the credits. */
4657         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4658             SCTP_MINIMAL_RWND));
4659
4660         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4661         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4662         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4663         /* now the address restriction */
4664         /* XXX Should we take the address family of the socket into account? */
4665         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4666             sizeof(*init));
4667         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4668 #ifdef INET6
4669 #ifdef INET
4670         /* we support 2 types: IPv4/IPv6 */
4671         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4672         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4673         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4674 #else
4675         /* we support 1 type: IPv6 */
4676         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4677         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4678         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4679 #endif
4680 #else
4681         /* we support 1 type: IPv4 */
4682         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4683         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4684         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4685 #endif
4686         SCTP_BUF_LEN(m) += sizeof(struct sctp_supported_addr_param);
4687         /* adaptation layer indication parameter */
4688         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(struct sctp_supported_addr_param));
4689         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4690         ali->ph.param_length = htons(sizeof(*ali));
4691         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4692         SCTP_BUF_LEN(m) += sizeof(*ali);
4693         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4694
4695         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4696                 /* Add NAT friendly parameter */
4697                 struct sctp_paramhdr *ph;
4698
4699                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4700                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4701                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4702                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4703                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4704         }
4705         /* now any cookie time extensions */
4706         if (stcb->asoc.cookie_preserve_req) {
4707                 struct sctp_cookie_perserve_param *cookie_preserve;
4708
4709                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4710                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4711                 cookie_preserve->ph.param_length = htons(
4712                     sizeof(*cookie_preserve));
4713                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4714                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4715                 ecn = (struct sctp_ecn_supported_param *)(
4716                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4717                 stcb->asoc.cookie_preserve_req = 0;
4718         }
4719         /* ECN parameter */
4720         if (stcb->asoc.ecn_allowed == 1) {
4721                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4722                 ecn->ph.param_length = htons(sizeof(*ecn));
4723                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4724                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4725                     sizeof(*ecn));
4726         } else {
4727                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4728         }
4729         /* And now tell the peer we do pr-sctp */
4730         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4731         prsctp->ph.param_length = htons(sizeof(*prsctp));
4732         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4733
4734         /* And now tell the peer we do all the extensions */
4735         pr_supported = (struct sctp_supported_chunk_types_param *)
4736             ((caddr_t)prsctp + sizeof(*prsctp));
4737         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4738         num_ext = 0;
4739         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4740         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4741         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4742         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4743         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4744         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4745                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4746         }
4747         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4748                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4749         }
4750         p_len = sizeof(*pr_supported) + num_ext;
4751         pr_supported->ph.param_length = htons(p_len);
4752         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4753         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4754
4755
4756         /* add authentication parameters */
4757         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4758                 struct sctp_auth_random *randp;
4759                 struct sctp_auth_hmac_algo *hmacs;
4760                 struct sctp_auth_chunk_list *chunks;
4761
4762                 /* attach RANDOM parameter, if available */
4763                 if (stcb->asoc.authinfo.random != NULL) {
4764                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4765                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4766                         /* random key already contains the header */
4767                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4768                         /* zero out any padding required */
4769                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4770                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4771                 }
4772                 /* add HMAC_ALGO parameter */
4773                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4774                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4775                     (uint8_t *) hmacs->hmac_ids);
4776                 if (p_len > 0) {
4777                         p_len += sizeof(*hmacs);
4778                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4779                         hmacs->ph.param_length = htons(p_len);
4780                         /* zero out any padding required */
4781                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4782                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4783                 }
4784                 /* add CHUNKS parameter */
4785                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4786                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4787                     chunks->chunk_types);
4788                 if (p_len > 0) {
4789                         p_len += sizeof(*chunks);
4790                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4791                         chunks->ph.param_length = htons(p_len);
4792                         /* zero out any padding required */
4793                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4794                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4795                 }
4796         }
4797         /* now the addresses */
4798         {
4799                 struct sctp_scoping scp;
4800
4801                 /*
4802                  * To optimize this we could put the scoping stuff into a
4803                  * structure and remove the individual uint8's from the
4804                  * assoc structure. Then we could just sifa in the address
4805                  * within the stcb. But for now this is a quick hack to get
4806                  * the address stuff teased apart.
4807                  */
4808
4809                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4810                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4811                 scp.loopback_scope = stcb->asoc.loopback_scope;
4812                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4813                 scp.local_scope = stcb->asoc.local_scope;
4814                 scp.site_scope = stcb->asoc.site_scope;
4815
4816                 sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to);
4817         }
4818
4819         /* calulate the size and update pkt header and chunk header */
4820         p_len = 0;
4821         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4822                 if (SCTP_BUF_NEXT(m_at) == NULL)
4823                         mp_last = m_at;
4824                 p_len += SCTP_BUF_LEN(m_at);
4825         }
4826         init->ch.chunk_length = htons(p_len);
4827         /*
4828          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4829          * here since the timer will drive a retranmission.
4830          */
4831
4832         /* I don't expect this to execute but we will be safe here */
4833         padval = p_len % 4;
4834         if ((padval) && (mp_last)) {
4835                 /*
4836                  * The compiler worries that mp_last may not be set even
4837                  * though I think it is impossible :-> however we add
4838                  * mp_last here just in case.
4839                  */
4840                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4841                 if (ret) {
4842                         /* Houston we have a problem, no space */
4843                         sctp_m_freem(m);
4844                         return;
4845                 }
4846         }
4847         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4848         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4849             (struct sockaddr *)&net->ro._l_addr,
4850             m, 0, NULL, 0, 0, 0, 0,
4851             inp->sctp_lport, stcb->rport, htonl(0),
4852             net->port, NULL,
4853             0, 0,
4854             so_locked);
4855         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4856         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4857         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4858 }
4859
4860 struct mbuf *
4861 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4862     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4863 {
4864         /*
4865          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4866          * being equal to the beginning of the params i.e. (iphlen +
4867          * sizeof(struct sctp_init_msg) parse through the parameters to the
4868          * end of the mbuf verifying that all parameters are known.
4869          *
4870          * For unknown parameters build and return a mbuf with
4871          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4872          * processing this chunk stop, and set *abort_processing to 1.
4873          *
4874          * By having param_offset be pre-set to where parameters begin it is
4875          * hoped that this routine may be reused in the future by new
4876          * features.
4877          */
4878         struct sctp_paramhdr *phdr, params;
4879
4880         struct mbuf *mat, *op_err;
4881         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4882         int at, limit, pad_needed;
4883         uint16_t ptype, plen, padded_size;
4884         int err_at;
4885
4886         *abort_processing = 0;
4887         mat = in_initpkt;
4888         err_at = 0;
4889         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4890         at = param_offset;
4891         op_err = NULL;
4892         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4893         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4894         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4895                 ptype = ntohs(phdr->param_type);
4896                 plen = ntohs(phdr->param_length);
4897                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4898                         /* wacked parameter */
4899                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4900                         goto invalid_size;
4901                 }
4902                 limit -= SCTP_SIZE32(plen);
4903                 /*-
4904                  * All parameters for all chunks that we know/understand are
4905                  * listed here. We process them other places and make
4906                  * appropriate stop actions per the upper bits. However this
4907                  * is the generic routine processor's can call to get back
4908                  * an operr.. to either incorporate (init-ack) or send.
4909                  */
4910                 padded_size = SCTP_SIZE32(plen);
4911                 switch (ptype) {
4912                         /* Param's with variable size */
4913                 case SCTP_HEARTBEAT_INFO:
4914                 case SCTP_STATE_COOKIE:
4915                 case SCTP_UNRECOG_PARAM:
4916                 case SCTP_ERROR_CAUSE_IND:
4917                         /* ok skip fwd */
4918                         at += padded_size;
4919                         break;
4920                         /* Param's with variable size within a range */
4921                 case SCTP_CHUNK_LIST:
4922                 case SCTP_SUPPORTED_CHUNK_EXT:
4923                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4924                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4925                                 goto invalid_size;
4926                         }
4927                         at += padded_size;
4928                         break;
4929                 case SCTP_SUPPORTED_ADDRTYPE:
4930                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4931                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4932                                 goto invalid_size;
4933                         }
4934                         at += padded_size;
4935                         break;
4936                 case SCTP_RANDOM:
4937                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4938                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4939                                 goto invalid_size;
4940                         }
4941                         at += padded_size;
4942                         break;
4943                 case SCTP_SET_PRIM_ADDR:
4944                 case SCTP_DEL_IP_ADDRESS:
4945                 case SCTP_ADD_IP_ADDRESS:
4946                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4947                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4948                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4949                                 goto invalid_size;
4950                         }
4951                         at += padded_size;
4952                         break;
4953                         /* Param's with a fixed size */
4954                 case SCTP_IPV4_ADDRESS:
4955                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4956                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4957                                 goto invalid_size;
4958                         }
4959                         at += padded_size;
4960                         break;
4961                 case SCTP_IPV6_ADDRESS:
4962                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4963                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4964                                 goto invalid_size;
4965                         }
4966                         at += padded_size;
4967                         break;
4968                 case SCTP_COOKIE_PRESERVE:
4969                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4970                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4971                                 goto invalid_size;
4972                         }
4973                         at += padded_size;
4974                         break;
4975                 case SCTP_HAS_NAT_SUPPORT:
4976                         *nat_friendly = 1;
4977                         /* fall through */
4978                 case SCTP_PRSCTP_SUPPORTED:
4979
4980                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4981                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4982                                 goto invalid_size;
4983                         }
4984                         at += padded_size;
4985                         break;
4986                 case SCTP_ECN_CAPABLE:
4987                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4988                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4989                                 goto invalid_size;
4990                         }
4991                         at += padded_size;
4992                         break;
4993                 case SCTP_ULP_ADAPTATION:
4994                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4995                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4996                                 goto invalid_size;
4997                         }
4998                         at += padded_size;
4999                         break;
5000                 case SCTP_SUCCESS_REPORT:
5001                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5002                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5003                                 goto invalid_size;
5004                         }
5005                         at += padded_size;
5006                         break;
5007                 case SCTP_HOSTNAME_ADDRESS:
5008                         {
5009                                 /* We can NOT handle HOST NAME addresses!! */
5010                                 int l_len;
5011
5012                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5013                                 *abort_processing = 1;
5014                                 if (op_err == NULL) {
5015                                         /* Ok need to try to get a mbuf */
5016 #ifdef INET6
5017                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5018 #else
5019                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5020 #endif
5021                                         l_len += plen;
5022                                         l_len += sizeof(struct sctp_paramhdr);
5023                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5024                                         if (op_err) {
5025                                                 SCTP_BUF_LEN(op_err) = 0;
5026                                                 /*
5027                                                  * pre-reserve space for ip
5028                                                  * and sctp header  and
5029                                                  * chunk hdr
5030                                                  */
5031 #ifdef INET6
5032                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5033 #else
5034                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5035 #endif
5036                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5037                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5038                                         }
5039                                 }
5040                                 if (op_err) {
5041                                         /* If we have space */
5042                                         struct sctp_paramhdr s;
5043
5044                                         if (err_at % 4) {
5045                                                 uint32_t cpthis = 0;
5046
5047                                                 pad_needed = 4 - (err_at % 4);
5048                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5049                                                 err_at += pad_needed;
5050                                         }
5051                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5052                                         s.param_length = htons(sizeof(s) + plen);
5053                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5054                                         err_at += sizeof(s);
5055                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5056                                         if (phdr == NULL) {
5057                                                 sctp_m_freem(op_err);
5058                                                 /*
5059                                                  * we are out of memory but
5060                                                  * we still need to have a
5061                                                  * look at what to do (the
5062                                                  * system is in trouble
5063                                                  * though).
5064                                                  */
5065                                                 return (NULL);
5066                                         }
5067                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5068                                 }
5069                                 return (op_err);
5070                                 break;
5071                         }
5072                 default:
5073                         /*
5074                          * we do not recognize the parameter figure out what
5075                          * we do.
5076                          */
5077                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5078                         if ((ptype & 0x4000) == 0x4000) {
5079                                 /* Report bit is set?? */
5080                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5081                                 if (op_err == NULL) {
5082                                         int l_len;
5083
5084                                         /* Ok need to try to get an mbuf */
5085 #ifdef INET6
5086                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5087 #else
5088                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5089 #endif
5090                                         l_len += plen;
5091                                         l_len += sizeof(struct sctp_paramhdr);
5092                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5093                                         if (op_err) {
5094                                                 SCTP_BUF_LEN(op_err) = 0;
5095 #ifdef INET6
5096                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5097 #else
5098                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5099 #endif
5100                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5101                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5102                                         }
5103                                 }
5104                                 if (op_err) {
5105                                         /* If we have space */
5106                                         struct sctp_paramhdr s;
5107
5108                                         if (err_at % 4) {
5109                                                 uint32_t cpthis = 0;
5110
5111                                                 pad_needed = 4 - (err_at % 4);
5112                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5113                                                 err_at += pad_needed;
5114                                         }
5115                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5116                                         s.param_length = htons(sizeof(s) + plen);
5117                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5118                                         err_at += sizeof(s);
5119                                         if (plen > sizeof(tempbuf)) {
5120                                                 plen = sizeof(tempbuf);
5121                                         }
5122                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5123                                         if (phdr == NULL) {
5124                                                 sctp_m_freem(op_err);
5125                                                 /*
5126                                                  * we are out of memory but
5127                                                  * we still need to have a
5128                                                  * look at what to do (the
5129                                                  * system is in trouble
5130                                                  * though).
5131                                                  */
5132                                                 op_err = NULL;
5133                                                 goto more_processing;
5134                                         }
5135                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5136                                         err_at += plen;
5137                                 }
5138                         }
5139         more_processing:
5140                         if ((ptype & 0x8000) == 0x0000) {
5141                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5142                                 return (op_err);
5143                         } else {
5144                                 /* skip this chunk and continue processing */
5145                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5146                                 at += SCTP_SIZE32(plen);
5147                         }
5148                         break;
5149
5150                 }
5151                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5152         }
5153         return (op_err);
5154 invalid_size:
5155         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5156         *abort_processing = 1;
5157         if ((op_err == NULL) && phdr) {
5158                 int l_len;
5159
5160 #ifdef INET6
5161                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5162 #else
5163                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5164 #endif
5165                 l_len += (2 * sizeof(struct sctp_paramhdr));
5166                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5167                 if (op_err) {
5168                         SCTP_BUF_LEN(op_err) = 0;
5169 #ifdef INET6
5170                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5171 #else
5172                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5173 #endif
5174                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5175                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5176                 }
5177         }
5178         if ((op_err) && phdr) {
5179                 struct sctp_paramhdr s;
5180
5181                 if (err_at % 4) {
5182                         uint32_t cpthis = 0;
5183
5184                         pad_needed = 4 - (err_at % 4);
5185                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5186                         err_at += pad_needed;
5187                 }
5188                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5189                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5190                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5191                 err_at += sizeof(s);
5192                 /* Only copy back the p-hdr that caused the issue */
5193                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5194         }
5195         return (op_err);
5196 }
5197
5198 static int
5199 sctp_are_there_new_addresses(struct sctp_association *asoc,
5200     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5201 {
5202         /*
5203          * Given a INIT packet, look through the packet to verify that there
5204          * are NO new addresses. As we go through the parameters add reports
5205          * of any un-understood parameters that require an error.  Also we
5206          * must return (1) to drop the packet if we see a un-understood
5207          * parameter that tells us to drop the chunk.
5208          */
5209         struct sockaddr *sa_touse;
5210         struct sockaddr *sa;
5211         struct sctp_paramhdr *phdr, params;
5212         uint16_t ptype, plen;
5213         uint8_t fnd;
5214         struct sctp_nets *net;
5215
5216 #ifdef INET
5217         struct sockaddr_in sin4, *sa4;
5218
5219 #endif
5220 #ifdef INET6
5221         struct sockaddr_in6 sin6, *sa6;
5222
5223 #endif
5224
5225 #ifdef INET
5226         memset(&sin4, 0, sizeof(sin4));
5227         sin4.sin_family = AF_INET;
5228         sin4.sin_len = sizeof(sin4);
5229 #endif
5230 #ifdef INET6
5231         memset(&sin6, 0, sizeof(sin6));
5232         sin6.sin6_family = AF_INET6;
5233         sin6.sin6_len = sizeof(sin6);
5234 #endif
5235         /* First what about the src address of the pkt ? */
5236         fnd = 0;
5237         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5238                 sa = (struct sockaddr *)&net->ro._l_addr;
5239                 if (sa->sa_family == src->sa_family) {
5240 #ifdef INET
5241                         if (sa->sa_family == AF_INET) {
5242                                 struct sockaddr_in *src4;
5243
5244                                 sa4 = (struct sockaddr_in *)sa;
5245                                 src4 = (struct sockaddr_in *)src;
5246                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5247                                         fnd = 1;
5248                                         break;
5249                                 }
5250                         }
5251 #endif
5252 #ifdef INET6
5253                         if (sa->sa_family == AF_INET6) {
5254                                 struct sockaddr_in6 *src6;
5255
5256                                 sa6 = (struct sockaddr_in6 *)sa;
5257                                 src6 = (struct sockaddr_in6 *)src;
5258                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5259                                         fnd = 1;
5260                                         break;
5261                                 }
5262                         }
5263 #endif
5264                 }
5265         }
5266         if (fnd == 0) {
5267                 /* New address added! no need to look futher. */
5268                 return (1);
5269         }
5270         /* Ok so far lets munge through the rest of the packet */
5271         offset += sizeof(struct sctp_init_chunk);
5272         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5273         while (phdr) {
5274                 sa_touse = NULL;
5275                 ptype = ntohs(phdr->param_type);
5276                 plen = ntohs(phdr->param_length);
5277                 switch (ptype) {
5278 #ifdef INET
5279                 case SCTP_IPV4_ADDRESS:
5280                         {
5281                                 struct sctp_ipv4addr_param *p4, p4_buf;
5282
5283                                 phdr = sctp_get_next_param(in_initpkt, offset,
5284                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5285                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5286                                     phdr == NULL) {
5287                                         return (1);
5288                                 }
5289                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5290                                 sin4.sin_addr.s_addr = p4->addr;
5291                                 sa_touse = (struct sockaddr *)&sin4;
5292                                 break;
5293                         }
5294 #endif
5295 #ifdef INET6
5296                 case SCTP_IPV6_ADDRESS:
5297                         {
5298                                 struct sctp_ipv6addr_param *p6, p6_buf;
5299
5300                                 phdr = sctp_get_next_param(in_initpkt, offset,
5301                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5302                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5303                                     phdr == NULL) {
5304                                         return (1);
5305                                 }
5306                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5307                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5308                                     sizeof(p6->addr));
5309                                 sa_touse = (struct sockaddr *)&sin6;
5310                                 break;
5311                         }
5312 #endif
5313                 default:
5314                         sa_touse = NULL;
5315                         break;
5316                 }
5317                 if (sa_touse) {
5318                         /* ok, sa_touse points to one to check */
5319                         fnd = 0;
5320                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5321                                 sa = (struct sockaddr *)&net->ro._l_addr;
5322                                 if (sa->sa_family != sa_touse->sa_family) {
5323                                         continue;
5324                                 }
5325 #ifdef INET
5326                                 if (sa->sa_family == AF_INET) {
5327                                         sa4 = (struct sockaddr_in *)sa;
5328                                         if (sa4->sin_addr.s_addr ==
5329                                             sin4.sin_addr.s_addr) {
5330                                                 fnd = 1;
5331                                                 break;
5332                                         }
5333                                 }
5334 #endif
5335 #ifdef INET6
5336                                 if (sa->sa_family == AF_INET6) {
5337                                         sa6 = (struct sockaddr_in6 *)sa;
5338                                         if (SCTP6_ARE_ADDR_EQUAL(
5339                                             sa6, &sin6)) {
5340                                                 fnd = 1;
5341                                                 break;
5342                                         }
5343                                 }
5344 #endif
5345                         }
5346                         if (!fnd) {
5347                                 /* New addr added! no need to look further */
5348                                 return (1);
5349                         }
5350                 }
5351                 offset += SCTP_SIZE32(plen);
5352                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5353         }
5354         return (0);
5355 }
5356
5357 /*
5358  * Given a MBUF chain that was sent into us containing an INIT. Build a
5359  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5360  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5361  * message (i.e. the struct sctp_init_msg).
5362  */
5363 void
5364 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5365     struct mbuf *init_pkt, int iphlen, int offset,
5366     struct sockaddr *src, struct sockaddr *dst,
5367     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5368     uint8_t use_mflowid, uint32_t mflowid,
5369     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5370 {
5371         struct sctp_association *asoc;
5372         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5373         struct sctp_init_ack_chunk *initack;
5374         struct sctp_adaptation_layer_indication *ali;
5375         struct sctp_ecn_supported_param *ecn;
5376         struct sctp_prsctp_supported_param *prsctp;
5377         struct sctp_supported_chunk_types_param *pr_supported;
5378         union sctp_sockstore *over_addr;
5379
5380 #ifdef INET
5381         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5382         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5383         struct sockaddr_in *sin;
5384
5385 #endif
5386 #ifdef INET6
5387         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5388         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5389         struct sockaddr_in6 *sin6;
5390
5391 #endif
5392         struct sockaddr *to;
5393         struct sctp_state_cookie stc;
5394         struct sctp_nets *net = NULL;
5395         uint8_t *signature = NULL;
5396         int cnt_inits_to = 0;
5397         uint16_t his_limit, i_want;
5398         int abort_flag, padval;
5399         int num_ext;
5400         int p_len;
5401         int nat_friendly = 0;
5402         struct socket *so;
5403
5404         if (stcb) {
5405                 asoc = &stcb->asoc;
5406         } else {
5407                 asoc = NULL;
5408         }
5409         mp_last = NULL;
5410         if ((asoc != NULL) &&
5411             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5412             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5413                 /* new addresses, out of here in non-cookie-wait states */
5414                 /*
5415                  * Send a ABORT, we don't add the new address error clause
5416                  * though we even set the T bit and copy in the 0 tag.. this
5417                  * looks no different than if no listener was present.
5418                  */
5419                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, NULL,
5420                     use_mflowid, mflowid,
5421                     vrf_id, port);
5422                 return;
5423         }
5424         abort_flag = 0;
5425         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5426             (offset + sizeof(struct sctp_init_chunk)),
5427             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5428         if (abort_flag) {
5429 do_a_abort:
5430                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5431                     init_chk->init.initiate_tag, op_err,
5432                     use_mflowid, mflowid,
5433                     vrf_id, port);
5434                 return;
5435         }
5436         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5437         if (m == NULL) {
5438                 /* No memory, INIT timer will re-attempt. */
5439                 if (op_err)
5440                         sctp_m_freem(op_err);
5441                 return;
5442         }
5443         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5444
5445         /* the time I built cookie */
5446         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5447
5448         /* populate any tie tags */
5449         if (asoc != NULL) {
5450                 /* unlock before tag selections */
5451                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5452                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5453                 stc.cookie_life = asoc->cookie_life;
5454                 net = asoc->primary_destination;
5455         } else {
5456                 stc.tie_tag_my_vtag = 0;
5457                 stc.tie_tag_peer_vtag = 0;
5458                 /* life I will award this cookie */
5459                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5460         }
5461
5462         /* copy in the ports for later check */
5463         stc.myport = sh->dest_port;
5464         stc.peerport = sh->src_port;
5465
5466         /*
5467          * If we wanted to honor cookie life extentions, we would add to
5468          * stc.cookie_life. For now we should NOT honor any extension
5469          */
5470         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5471         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5472                 struct inpcb *in_inp;
5473
5474                 /* Its a V6 socket */
5475                 in_inp = (struct inpcb *)inp;
5476                 stc.ipv6_addr_legal = 1;
5477                 /* Now look at the binding flag to see if V4 will be legal */
5478                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5479                         stc.ipv4_addr_legal = 1;
5480                 } else {
5481                         /* V4 addresses are NOT legal on the association */
5482                         stc.ipv4_addr_legal = 0;
5483                 }
5484         } else {
5485                 /* Its a V4 socket, no - V6 */
5486                 stc.ipv4_addr_legal = 1;
5487                 stc.ipv6_addr_legal = 0;
5488         }
5489
5490 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5491         stc.ipv4_scope = 1;
5492 #else
5493         stc.ipv4_scope = 0;
5494 #endif
5495         if (net == NULL) {
5496                 to = src;
5497                 switch (dst->sa_family) {
5498 #ifdef INET
5499                 case AF_INET:
5500                         {
5501                                 /* lookup address */
5502                                 stc.address[0] = src4->sin_addr.s_addr;
5503                                 stc.address[1] = 0;
5504                                 stc.address[2] = 0;
5505                                 stc.address[3] = 0;
5506                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5507                                 /* local from address */
5508                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5509                                 stc.laddress[1] = 0;
5510                                 stc.laddress[2] = 0;
5511                                 stc.laddress[3] = 0;
5512                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5513                                 /* scope_id is only for v6 */
5514                                 stc.scope_id = 0;
5515 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5516                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5517                                         stc.ipv4_scope = 1;
5518                                 }
5519 #else
5520                                 stc.ipv4_scope = 1;
5521 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5522                                 /* Must use the address in this case */
5523                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5524                                         stc.loopback_scope = 1;
5525                                         stc.ipv4_scope = 1;
5526                                         stc.site_scope = 1;
5527                                         stc.local_scope = 0;
5528                                 }
5529                                 break;
5530                         }
5531 #endif
5532 #ifdef INET6
5533                 case AF_INET6:
5534                         {
5535                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5536                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5537                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5538                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5539                                         stc.loopback_scope = 1;
5540                                         stc.local_scope = 0;
5541                                         stc.site_scope = 1;
5542                                         stc.ipv4_scope = 1;
5543                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5544                                         /*
5545                                          * If the new destination is a
5546                                          * LINK_LOCAL we must have common
5547                                          * both site and local scope. Don't
5548                                          * set local scope though since we
5549                                          * must depend on the source to be
5550                                          * added implicitly. We cannot
5551                                          * assure just because we share one
5552                                          * link that all links are common.
5553                                          */
5554                                         stc.local_scope = 0;
5555                                         stc.site_scope = 1;
5556                                         stc.ipv4_scope = 1;
5557                                         /*
5558                                          * we start counting for the private
5559                                          * address stuff at 1. since the
5560                                          * link local we source from won't
5561                                          * show up in our scoped count.
5562                                          */
5563                                         cnt_inits_to = 1;
5564                                         /*
5565                                          * pull out the scope_id from
5566                                          * incoming pkt
5567                                          */
5568                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5569                                         /*
5570                                          * If the new destination is
5571                                          * SITE_LOCAL then we must have site
5572                                          * scope in common.
5573                                          */
5574                                         stc.site_scope = 1;
5575                                 }
5576                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5577                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5578                                 break;
5579                         }
5580 #endif
5581                 default:
5582                         /* TSNH */
5583                         goto do_a_abort;
5584                         break;
5585                 }
5586         } else {
5587                 /* set the scope per the existing tcb */
5588
5589 #ifdef INET6
5590                 struct sctp_nets *lnet;
5591
5592 #endif
5593
5594                 stc.loopback_scope = asoc->loopback_scope;
5595                 stc.ipv4_scope = asoc->ipv4_local_scope;
5596                 stc.site_scope = asoc->site_scope;
5597                 stc.local_scope = asoc->local_scope;
5598 #ifdef INET6
5599                 /* Why do we not consider IPv4 LL addresses? */
5600                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5601                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5602                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5603                                         /*
5604                                          * if we have a LL address, start
5605                                          * counting at 1.
5606                                          */
5607                                         cnt_inits_to = 1;
5608                                 }
5609                         }
5610                 }
5611 #endif
5612                 /* use the net pointer */
5613                 to = (struct sockaddr *)&net->ro._l_addr;
5614                 switch (to->sa_family) {
5615 #ifdef INET
5616                 case AF_INET:
5617                         sin = (struct sockaddr_in *)to;
5618                         stc.address[0] = sin->sin_addr.s_addr;
5619                         stc.address[1] = 0;
5620                         stc.address[2] = 0;
5621                         stc.address[3] = 0;
5622                         stc.addr_type = SCTP_IPV4_ADDRESS;
5623                         if (net->src_addr_selected == 0) {
5624                                 /*
5625                                  * strange case here, the INIT should have
5626                                  * did the selection.
5627                                  */
5628                                 net->ro._s_addr = sctp_source_address_selection(inp,
5629                                     stcb, (sctp_route_t *) & net->ro,
5630                                     net, 0, vrf_id);
5631                                 if (net->ro._s_addr == NULL)
5632                                         return;
5633
5634                                 net->src_addr_selected = 1;
5635
5636                         }
5637                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5638                         stc.laddress[1] = 0;
5639                         stc.laddress[2] = 0;
5640                         stc.laddress[3] = 0;
5641                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5642                         /* scope_id is only for v6 */
5643                         stc.scope_id = 0;
5644                         break;
5645 #endif
5646 #ifdef INET6
5647                 case AF_INET6:
5648                         sin6 = (struct sockaddr_in6 *)to;
5649                         memcpy(&stc.address, &sin6->sin6_addr,
5650                             sizeof(struct in6_addr));
5651                         stc.addr_type = SCTP_IPV6_ADDRESS;
5652                         stc.scope_id = sin6->sin6_scope_id;
5653                         if (net->src_addr_selected == 0) {
5654                                 /*
5655                                  * strange case here, the INIT should have
5656                                  * done the selection.
5657                                  */
5658                                 net->ro._s_addr = sctp_source_address_selection(inp,
5659                                     stcb, (sctp_route_t *) & net->ro,
5660                                     net, 0, vrf_id);
5661                                 if (net->ro._s_addr == NULL)
5662                                         return;
5663
5664                                 net->src_addr_selected = 1;
5665                         }
5666                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5667                             sizeof(struct in6_addr));
5668                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5669                         break;
5670 #endif
5671                 }
5672         }
5673         /* Now lets put the SCTP header in place */
5674         initack = mtod(m, struct sctp_init_ack_chunk *);
5675         /* Save it off for quick ref */
5676         stc.peers_vtag = init_chk->init.initiate_tag;
5677         /* who are we */
5678         memcpy(stc.identification, SCTP_VERSION_STRING,
5679             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5680         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5681         /* now the chunk header */
5682         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5683         initack->ch.chunk_flags = 0;
5684         /* fill in later from mbuf we build */
5685         initack->ch.chunk_length = 0;
5686         /* place in my tag */
5687         if ((asoc != NULL) &&
5688             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5689             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5690             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5691                 /* re-use the v-tags and init-seq here */
5692                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5693                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5694         } else {
5695                 uint32_t vtag, itsn;
5696
5697                 if (hold_inp_lock) {
5698                         SCTP_INP_INCR_REF(inp);
5699                         SCTP_INP_RUNLOCK(inp);
5700                 }
5701                 if (asoc) {
5702                         atomic_add_int(&asoc->refcnt, 1);
5703                         SCTP_TCB_UNLOCK(stcb);
5704         new_tag:
5705                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5706                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5707                                 /*
5708                                  * Got a duplicate vtag on some guy behind a
5709                                  * nat make sure we don't use it.
5710                                  */
5711                                 goto new_tag;
5712                         }
5713                         initack->init.initiate_tag = htonl(vtag);
5714                         /* get a TSN to use too */
5715                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5716                         initack->init.initial_tsn = htonl(itsn);
5717                         SCTP_TCB_LOCK(stcb);
5718                         atomic_add_int(&asoc->refcnt, -1);
5719                 } else {
5720                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5721                         initack->init.initiate_tag = htonl(vtag);
5722                         /* get a TSN to use too */
5723                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5724                 }
5725                 if (hold_inp_lock) {
5726                         SCTP_INP_RLOCK(inp);
5727                         SCTP_INP_DECR_REF(inp);
5728                 }
5729         }
5730         /* save away my tag to */
5731         stc.my_vtag = initack->init.initiate_tag;
5732
5733         /* set up some of the credits. */
5734         so = inp->sctp_socket;
5735         if (so == NULL) {
5736                 /* memory problem */
5737                 sctp_m_freem(m);
5738                 return;
5739         } else {
5740                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5741         }
5742         /* set what I want */
5743         his_limit = ntohs(init_chk->init.num_inbound_streams);
5744         /* choose what I want */
5745         if (asoc != NULL) {
5746                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5747                         i_want = asoc->streamoutcnt;
5748                 } else {
5749                         i_want = inp->sctp_ep.pre_open_stream_count;
5750                 }
5751         } else {
5752                 i_want = inp->sctp_ep.pre_open_stream_count;
5753         }
5754         if (his_limit < i_want) {
5755                 /* I Want more :< */
5756                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5757         } else {
5758                 /* I can have what I want :> */
5759                 initack->init.num_outbound_streams = htons(i_want);
5760         }
5761         /* tell him his limt. */
5762         initack->init.num_inbound_streams =
5763             htons(inp->sctp_ep.max_open_streams_intome);
5764
5765         /* adaptation layer indication parameter */
5766         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5767         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5768         ali->ph.param_length = htons(sizeof(*ali));
5769         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5770         SCTP_BUF_LEN(m) += sizeof(*ali);
5771         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5772
5773         /* ECN parameter */
5774         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5775             (inp->sctp_ecn_enable == 1)) {
5776                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5777                 ecn->ph.param_length = htons(sizeof(*ecn));
5778                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5779
5780                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5781                     sizeof(*ecn));
5782         } else {
5783                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5784         }
5785         /* And now tell the peer we do  pr-sctp */
5786         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5787         prsctp->ph.param_length = htons(sizeof(*prsctp));
5788         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5789         if (nat_friendly) {
5790                 /* Add NAT friendly parameter */
5791                 struct sctp_paramhdr *ph;
5792
5793                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5794                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5795                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5796                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5797         }
5798         /* And now tell the peer we do all the extensions */
5799         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5800         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5801         num_ext = 0;
5802         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5803         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5804         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5805         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5806         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5807         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5808                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5809         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5810                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5811         p_len = sizeof(*pr_supported) + num_ext;
5812         pr_supported->ph.param_length = htons(p_len);
5813         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5814         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5815
5816         /* add authentication parameters */
5817         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5818                 struct sctp_auth_random *randp;
5819                 struct sctp_auth_hmac_algo *hmacs;
5820                 struct sctp_auth_chunk_list *chunks;
5821                 uint16_t random_len;
5822
5823                 /* generate and add RANDOM parameter */
5824                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5825                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5826                 randp->ph.param_type = htons(SCTP_RANDOM);
5827                 p_len = sizeof(*randp) + random_len;
5828                 randp->ph.param_length = htons(p_len);
5829                 SCTP_READ_RANDOM(randp->random_data, random_len);
5830                 /* zero out any padding required */
5831                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5832                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5833
5834                 /* add HMAC_ALGO parameter */
5835                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5836                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5837                     (uint8_t *) hmacs->hmac_ids);
5838                 if (p_len > 0) {
5839                         p_len += sizeof(*hmacs);
5840                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5841                         hmacs->ph.param_length = htons(p_len);
5842                         /* zero out any padding required */
5843                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5844                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5845                 }
5846                 /* add CHUNKS parameter */
5847                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5848                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5849                     chunks->chunk_types);
5850                 if (p_len > 0) {
5851                         p_len += sizeof(*chunks);
5852                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5853                         chunks->ph.param_length = htons(p_len);
5854                         /* zero out any padding required */
5855                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5856                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5857                 }
5858         }
5859         m_at = m;
5860         /* now the addresses */
5861         {
5862                 struct sctp_scoping scp;
5863
5864                 /*
5865                  * To optimize this we could put the scoping stuff into a
5866                  * structure and remove the individual uint8's from the stc
5867                  * structure. Then we could just sifa in the address within
5868                  * the stc.. but for now this is a quick hack to get the
5869                  * address stuff teased apart.
5870                  */
5871                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5872                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5873                 scp.loopback_scope = stc.loopback_scope;
5874                 scp.ipv4_local_scope = stc.ipv4_scope;
5875                 scp.local_scope = stc.local_scope;
5876                 scp.site_scope = stc.site_scope;
5877                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5878         }
5879
5880         /* tack on the operational error if present */
5881         if (op_err) {
5882                 struct mbuf *ol;
5883                 int llen;
5884
5885                 llen = 0;
5886                 ol = op_err;
5887
5888                 while (ol) {
5889                         llen += SCTP_BUF_LEN(ol);
5890                         ol = SCTP_BUF_NEXT(ol);
5891                 }
5892                 if (llen % 4) {
5893                         /* must add a pad to the param */
5894                         uint32_t cpthis = 0;
5895                         int padlen;
5896
5897                         padlen = 4 - (llen % 4);
5898                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5899                 }
5900                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5901                         m_at = SCTP_BUF_NEXT(m_at);
5902                 }
5903                 SCTP_BUF_NEXT(m_at) = op_err;
5904                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5905                         m_at = SCTP_BUF_NEXT(m_at);
5906                 }
5907         }
5908         /* pre-calulate the size and update pkt header and chunk header */
5909         p_len = 0;
5910         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5911                 p_len += SCTP_BUF_LEN(m_tmp);
5912                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5913                         /* m_tmp should now point to last one */
5914                         break;
5915                 }
5916         }
5917
5918         /* Now we must build a cookie */
5919         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5920         if (m_cookie == NULL) {
5921                 /* memory problem */
5922                 sctp_m_freem(m);
5923                 return;
5924         }
5925         /* Now append the cookie to the end and update the space/size */
5926         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5927
5928         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5929                 p_len += SCTP_BUF_LEN(m_tmp);
5930                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5931                         /* m_tmp should now point to last one */
5932                         mp_last = m_tmp;
5933                         break;
5934                 }
5935         }
5936         /*
5937          * Place in the size, but we don't include the last pad (if any) in
5938          * the INIT-ACK.
5939          */
5940         initack->ch.chunk_length = htons(p_len);
5941
5942         /*
5943          * Time to sign the cookie, we don't sign over the cookie signature
5944          * though thus we set trailer.
5945          */
5946         (void)sctp_hmac_m(SCTP_HMAC,
5947             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5948             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5949             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5950         /*
5951          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5952          * here since the timer will drive a retranmission.
5953          */
5954         padval = p_len % 4;
5955         if ((padval) && (mp_last)) {
5956                 /* see my previous comments on mp_last */
5957                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
5958                         /* Houston we have a problem, no space */
5959                         sctp_m_freem(m);
5960                         return;
5961                 }
5962         }
5963         if (stc.loopback_scope) {
5964                 over_addr = (union sctp_sockstore *)dst;
5965         } else {
5966                 over_addr = NULL;
5967         }
5968
5969         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5970             0, 0,
5971             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5972             port, over_addr,
5973             use_mflowid, mflowid,
5974             SCTP_SO_NOT_LOCKED);
5975         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5976 }
5977
5978
5979 static void
5980 sctp_prune_prsctp(struct sctp_tcb *stcb,
5981     struct sctp_association *asoc,
5982     struct sctp_sndrcvinfo *srcv,
5983     int dataout)
5984 {
5985         int freed_spc = 0;
5986         struct sctp_tmit_chunk *chk, *nchk;
5987
5988         SCTP_TCB_LOCK_ASSERT(stcb);
5989         if ((asoc->peer_supports_prsctp) &&
5990             (asoc->sent_queue_cnt_removeable > 0)) {
5991                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5992                         /*
5993                          * Look for chunks marked with the PR_SCTP flag AND
5994                          * the buffer space flag. If the one being sent is
5995                          * equal or greater priority then purge the old one
5996                          * and free some space.
5997                          */
5998                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5999                                 /*
6000                                  * This one is PR-SCTP AND buffer space
6001                                  * limited type
6002                                  */
6003                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6004                                         /*
6005                                          * Lower numbers equates to higher
6006                                          * priority so if the one we are
6007                                          * looking at has a larger or equal
6008                                          * priority we want to drop the data
6009                                          * and NOT retransmit it.
6010                                          */
6011                                         if (chk->data) {
6012                                                 /*
6013                                                  * We release the book_size
6014                                                  * if the mbuf is here
6015                                                  */
6016                                                 int ret_spc;
6017                                                 uint8_t sent;
6018
6019                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6020                                                         sent = 1;
6021                                                 else
6022                                                         sent = 0;
6023                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6024                                                     sent,
6025                                                     SCTP_SO_LOCKED);
6026                                                 freed_spc += ret_spc;
6027                                                 if (freed_spc >= dataout) {
6028                                                         return;
6029                                                 }
6030                                         }       /* if chunk was present */
6031                                 }       /* if of sufficent priority */
6032                         }       /* if chunk has enabled */
6033                 }               /* tailqforeach */
6034
6035                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6036                         /* Here we must move to the sent queue and mark */
6037                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6038                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6039                                         if (chk->data) {
6040                                                 /*
6041                                                  * We release the book_size
6042                                                  * if the mbuf is here
6043                                                  */
6044                                                 int ret_spc;
6045
6046                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6047                                                     0, SCTP_SO_LOCKED);
6048
6049                                                 freed_spc += ret_spc;
6050                                                 if (freed_spc >= dataout) {
6051                                                         return;
6052                                                 }
6053                                         }       /* end if chk->data */
6054                                 }       /* end if right class */
6055                         }       /* end if chk pr-sctp */
6056                 }               /* tailqforeachsafe (chk) */
6057         }                       /* if enabled in asoc */
6058 }
6059
6060 int
6061 sctp_get_frag_point(struct sctp_tcb *stcb,
6062     struct sctp_association *asoc)
6063 {
6064         int siz, ovh;
6065
6066         /*
6067          * For endpoints that have both v6 and v4 addresses we must reserve
6068          * room for the ipv6 header, for those that are only dealing with V4
6069          * we use a larger frag point.
6070          */
6071         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6072                 ovh = SCTP_MED_OVERHEAD;
6073         } else {
6074                 ovh = SCTP_MED_V4_OVERHEAD;
6075         }
6076
6077         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6078                 siz = asoc->smallest_mtu - ovh;
6079         else
6080                 siz = (stcb->asoc.sctp_frag_point - ovh);
6081         /*
6082          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6083          */
6084         /* A data chunk MUST fit in a cluster */
6085         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6086         /* } */
6087
6088         /* adjust for an AUTH chunk if DATA requires auth */
6089         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6090                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6091
6092         if (siz % 4) {
6093                 /* make it an even word boundary please */
6094                 siz -= (siz % 4);
6095         }
6096         return (siz);
6097 }
6098
6099 static void
6100 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6101 {
6102         sp->pr_sctp_on = 0;
6103         /*
6104          * We assume that the user wants PR_SCTP_TTL if the user provides a
6105          * positive lifetime but does not specify any PR_SCTP policy. This
6106          * is a BAD assumption and causes problems at least with the
6107          * U-Vancovers MPI folks. I will change this to be no policy means
6108          * NO PR-SCTP.
6109          */
6110         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6111                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6112                 sp->pr_sctp_on = 1;
6113         } else {
6114                 return;
6115         }
6116         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6117         case CHUNK_FLAGS_PR_SCTP_BUF:
6118                 /*
6119                  * Time to live is a priority stored in tv_sec when doing
6120                  * the buffer drop thing.
6121                  */
6122                 sp->ts.tv_sec = sp->timetolive;
6123                 sp->ts.tv_usec = 0;
6124                 break;
6125         case CHUNK_FLAGS_PR_SCTP_TTL:
6126                 {
6127                         struct timeval tv;
6128
6129                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6130                         tv.tv_sec = sp->timetolive / 1000;
6131                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6132                         /*
6133                          * TODO sctp_constants.h needs alternative time
6134                          * macros when _KERNEL is undefined.
6135                          */
6136                         timevaladd(&sp->ts, &tv);
6137                 }
6138                 break;
6139         case CHUNK_FLAGS_PR_SCTP_RTX:
6140                 /*
6141                  * Time to live is a the number or retransmissions stored in
6142                  * tv_sec.
6143                  */
6144                 sp->ts.tv_sec = sp->timetolive;
6145                 sp->ts.tv_usec = 0;
6146                 break;
6147         default:
6148                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6149                     "Unknown PR_SCTP policy %u.\n",
6150                     PR_SCTP_POLICY(sp->sinfo_flags));
6151                 break;
6152         }
6153 }
6154
6155 static int
6156 sctp_msg_append(struct sctp_tcb *stcb,
6157     struct sctp_nets *net,
6158     struct mbuf *m,
6159     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6160 {
6161         int error = 0;
6162         struct mbuf *at;
6163         struct sctp_stream_queue_pending *sp = NULL;
6164         struct sctp_stream_out *strm;
6165
6166         /*
6167          * Given an mbuf chain, put it into the association send queue and
6168          * place it on the wheel
6169          */
6170         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6171                 /* Invalid stream number */
6172                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6173                 error = EINVAL;
6174                 goto out_now;
6175         }
6176         if ((stcb->asoc.stream_locked) &&
6177             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6178                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6179                 error = EINVAL;
6180                 goto out_now;
6181         }
6182         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6183         /* Now can we send this? */
6184         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6185             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6186             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6187             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6188                 /* got data while shutting down */
6189                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6190                 error = ECONNRESET;
6191                 goto out_now;
6192         }
6193         sctp_alloc_a_strmoq(stcb, sp);
6194         if (sp == NULL) {
6195                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6196                 error = ENOMEM;
6197                 goto out_now;
6198         }
6199         sp->sinfo_flags = srcv->sinfo_flags;
6200         sp->timetolive = srcv->sinfo_timetolive;
6201         sp->ppid = srcv->sinfo_ppid;
6202         sp->context = srcv->sinfo_context;
6203         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6204                 sp->net = net;
6205                 atomic_add_int(&sp->net->ref_count, 1);
6206         } else {
6207                 sp->net = NULL;
6208         }
6209         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6210         sp->stream = srcv->sinfo_stream;
6211         sp->msg_is_complete = 1;
6212         sp->sender_all_done = 1;
6213         sp->some_taken = 0;
6214         sp->data = m;
6215         sp->tail_mbuf = NULL;
6216         sctp_set_prsctp_policy(sp);
6217         /*
6218          * We could in theory (for sendall) sifa the length in, but we would
6219          * still have to hunt through the chain since we need to setup the
6220          * tail_mbuf
6221          */
6222         sp->length = 0;
6223         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6224                 if (SCTP_BUF_NEXT(at) == NULL)
6225                         sp->tail_mbuf = at;
6226                 sp->length += SCTP_BUF_LEN(at);
6227         }
6228         if (srcv->sinfo_keynumber_valid) {
6229                 sp->auth_keyid = srcv->sinfo_keynumber;
6230         } else {
6231                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6232         }
6233         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6234                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6235                 sp->holds_key_ref = 1;
6236         }
6237         if (hold_stcb_lock == 0) {
6238                 SCTP_TCB_SEND_LOCK(stcb);
6239         }
6240         sctp_snd_sb_alloc(stcb, sp->length);
6241         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6242         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6243         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6244         m = NULL;
6245         if (hold_stcb_lock == 0) {
6246                 SCTP_TCB_SEND_UNLOCK(stcb);
6247         }
6248 out_now:
6249         if (m) {
6250                 sctp_m_freem(m);
6251         }
6252         return (error);
6253 }
6254
6255
6256 static struct mbuf *
6257 sctp_copy_mbufchain(struct mbuf *clonechain,
6258     struct mbuf *outchain,
6259     struct mbuf **endofchain,
6260     int can_take_mbuf,
6261     int sizeofcpy,
6262     uint8_t copy_by_ref)
6263 {
6264         struct mbuf *m;
6265         struct mbuf *appendchain;
6266         caddr_t cp;
6267         int len;
6268
6269         if (endofchain == NULL) {
6270                 /* error */
6271 error_out:
6272                 if (outchain)
6273                         sctp_m_freem(outchain);
6274                 return (NULL);
6275         }
6276         if (can_take_mbuf) {
6277                 appendchain = clonechain;
6278         } else {
6279                 if (!copy_by_ref &&
6280                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6281                     ) {
6282                         /* Its not in a cluster */
6283                         if (*endofchain == NULL) {
6284                                 /* lets get a mbuf cluster */
6285                                 if (outchain == NULL) {
6286                                         /* This is the general case */
6287                         new_mbuf:
6288                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6289                                         if (outchain == NULL) {
6290                                                 goto error_out;
6291                                         }
6292                                         SCTP_BUF_LEN(outchain) = 0;
6293                                         *endofchain = outchain;
6294                                         /* get the prepend space */
6295                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6296                                 } else {
6297                                         /*
6298                                          * We really should not get a NULL
6299                                          * in endofchain
6300                                          */
6301                                         /* find end */
6302                                         m = outchain;
6303                                         while (m) {
6304                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6305                                                         *endofchain = m;
6306                                                         break;
6307                                                 }
6308                                                 m = SCTP_BUF_NEXT(m);
6309                                         }
6310                                         /* sanity */
6311                                         if (*endofchain == NULL) {
6312                                                 /*
6313                                                  * huh, TSNH XXX maybe we
6314                                                  * should panic
6315                                                  */
6316                                                 sctp_m_freem(outchain);
6317                                                 goto new_mbuf;
6318                                         }
6319                                 }
6320                                 /* get the new end of length */
6321                                 len = M_TRAILINGSPACE(*endofchain);
6322                         } else {
6323                                 /* how much is left at the end? */
6324                                 len = M_TRAILINGSPACE(*endofchain);
6325                         }
6326                         /* Find the end of the data, for appending */
6327                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6328
6329                         /* Now lets copy it out */
6330                         if (len >= sizeofcpy) {
6331                                 /* It all fits, copy it in */
6332                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6333                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6334                         } else {
6335                                 /* fill up the end of the chain */
6336                                 if (len > 0) {
6337                                         m_copydata(clonechain, 0, len, cp);
6338                                         SCTP_BUF_LEN((*endofchain)) += len;
6339                                         /* now we need another one */
6340                                         sizeofcpy -= len;
6341                                 }
6342                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6343                                 if (m == NULL) {
6344                                         /* We failed */
6345                                         goto error_out;
6346                                 }
6347                                 SCTP_BUF_NEXT((*endofchain)) = m;
6348                                 *endofchain = m;
6349                                 cp = mtod((*endofchain), caddr_t);
6350                                 m_copydata(clonechain, len, sizeofcpy, cp);
6351                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6352                         }
6353                         return (outchain);
6354                 } else {
6355                         /* copy the old fashion way */
6356                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6357 #ifdef SCTP_MBUF_LOGGING
6358                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6359                                 struct mbuf *mat;
6360
6361                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6362                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6363                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6364                                         }
6365                                 }
6366                         }
6367 #endif
6368                 }
6369         }
6370         if (appendchain == NULL) {
6371                 /* error */
6372                 if (outchain)
6373                         sctp_m_freem(outchain);
6374                 return (NULL);
6375         }
6376         if (outchain) {
6377                 /* tack on to the end */
6378                 if (*endofchain != NULL) {
6379                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6380                 } else {
6381                         m = outchain;
6382                         while (m) {
6383                                 if (SCTP_BUF_NEXT(m) == NULL) {
6384                                         SCTP_BUF_NEXT(m) = appendchain;
6385                                         break;
6386                                 }
6387                                 m = SCTP_BUF_NEXT(m);
6388                         }
6389                 }
6390                 /*
6391                  * save off the end and update the end-chain postion
6392                  */
6393                 m = appendchain;
6394                 while (m) {
6395                         if (SCTP_BUF_NEXT(m) == NULL) {
6396                                 *endofchain = m;
6397                                 break;
6398                         }
6399                         m = SCTP_BUF_NEXT(m);
6400                 }
6401                 return (outchain);
6402         } else {
6403                 /* save off the end and update the end-chain postion */
6404                 m = appendchain;
6405                 while (m) {
6406                         if (SCTP_BUF_NEXT(m) == NULL) {
6407                                 *endofchain = m;
6408                                 break;
6409                         }
6410                         m = SCTP_BUF_NEXT(m);
6411                 }
6412                 return (appendchain);
6413         }
6414 }
6415
6416 static int
6417 sctp_med_chunk_output(struct sctp_inpcb *inp,
6418     struct sctp_tcb *stcb,
6419     struct sctp_association *asoc,
6420     int *num_out,
6421     int *reason_code,
6422     int control_only, int from_where,
6423     struct timeval *now, int *now_filled, int frag_point, int so_locked
6424 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6425     SCTP_UNUSED
6426 #endif
6427 );
6428
6429 static void
6430 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6431     uint32_t val SCTP_UNUSED)
6432 {
6433         struct sctp_copy_all *ca;
6434         struct mbuf *m;
6435         int ret = 0;
6436         int added_control = 0;
6437         int un_sent, do_chunk_output = 1;
6438         struct sctp_association *asoc;
6439         struct sctp_nets *net;
6440
6441         ca = (struct sctp_copy_all *)ptr;
6442         if (ca->m == NULL) {
6443                 return;
6444         }
6445         if (ca->inp != inp) {
6446                 /* TSNH */
6447                 return;
6448         }
6449         if ((ca->m) && ca->sndlen) {
6450                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6451                 if (m == NULL) {
6452                         /* can't copy so we are done */
6453                         ca->cnt_failed++;
6454                         return;
6455                 }
6456 #ifdef SCTP_MBUF_LOGGING
6457                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6458                         struct mbuf *mat;
6459
6460                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6461                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6462                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6463                                 }
6464                         }
6465                 }
6466 #endif
6467         } else {
6468                 m = NULL;
6469         }
6470         SCTP_TCB_LOCK_ASSERT(stcb);
6471         if (stcb->asoc.alternate) {
6472                 net = stcb->asoc.alternate;
6473         } else {
6474                 net = stcb->asoc.primary_destination;
6475         }
6476         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6477                 /* Abort this assoc with m as the user defined reason */
6478                 if (m) {
6479                         struct sctp_paramhdr *ph;
6480
6481                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6482                         if (m) {
6483                                 ph = mtod(m, struct sctp_paramhdr *);
6484                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6485                                 ph->param_length = htons(ca->sndlen);
6486                         }
6487                         /*
6488                          * We add one here to keep the assoc from
6489                          * dis-appearing on us.
6490                          */
6491                         atomic_add_int(&stcb->asoc.refcnt, 1);
6492                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6493                         /*
6494                          * sctp_abort_an_association calls sctp_free_asoc()
6495                          * free association will NOT free it since we
6496                          * incremented the refcnt .. we do this to prevent
6497                          * it being freed and things getting tricky since we
6498                          * could end up (from free_asoc) calling inpcb_free
6499                          * which would get a recursive lock call to the
6500                          * iterator lock.. But as a consequence of that the
6501                          * stcb will return to us un-locked.. since
6502                          * free_asoc returns with either no TCB or the TCB
6503                          * unlocked, we must relock.. to unlock in the
6504                          * iterator timer :-0
6505                          */
6506                         SCTP_TCB_LOCK(stcb);
6507                         atomic_add_int(&stcb->asoc.refcnt, -1);
6508                         goto no_chunk_output;
6509                 }
6510         } else {
6511                 if (m) {
6512                         ret = sctp_msg_append(stcb, net, m,
6513                             &ca->sndrcv, 1);
6514                 }
6515                 asoc = &stcb->asoc;
6516                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6517                         /* shutdown this assoc */
6518                         int cnt;
6519
6520                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6521
6522                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6523                             TAILQ_EMPTY(&asoc->sent_queue) &&
6524                             (cnt == 0)) {
6525                                 if (asoc->locked_on_sending) {
6526                                         goto abort_anyway;
6527                                 }
6528                                 /*
6529                                  * there is nothing queued to send, so I'm
6530                                  * done...
6531                                  */
6532                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6533                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6534                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6535                                         /*
6536                                          * only send SHUTDOWN the first time
6537                                          * through
6538                                          */
6539                                         sctp_send_shutdown(stcb, net);
6540                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6541                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6542                                         }
6543                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6544                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6545                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6546                                             net);
6547                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6548                                             asoc->primary_destination);
6549                                         added_control = 1;
6550                                         do_chunk_output = 0;
6551                                 }
6552                         } else {
6553                                 /*
6554                                  * we still got (or just got) data to send,
6555                                  * so set SHUTDOWN_PENDING
6556                                  */
6557                                 /*
6558                                  * XXX sockets draft says that SCTP_EOF
6559                                  * should be sent with no data.  currently,
6560                                  * we will allow user data to be sent first
6561                                  * and move to SHUTDOWN-PENDING
6562                                  */
6563                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6564                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6565                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6566                                         if (asoc->locked_on_sending) {
6567                                                 /*
6568                                                  * Locked to send out the
6569                                                  * data
6570                                                  */
6571                                                 struct sctp_stream_queue_pending *sp;
6572
6573                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6574                                                 if (sp) {
6575                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6576                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6577                                                 }
6578                                         }
6579                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6580                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6581                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6582                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6583                                 abort_anyway:
6584                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6585                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6586                                                     NULL, SCTP_SO_NOT_LOCKED);
6587                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6588                                                 goto no_chunk_output;
6589                                         }
6590                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6591                                             asoc->primary_destination);
6592                                 }
6593                         }
6594
6595                 }
6596         }
6597         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6598             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6599
6600         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6601             (stcb->asoc.total_flight > 0) &&
6602             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6603             ) {
6604                 do_chunk_output = 0;
6605         }
6606         if (do_chunk_output)
6607                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6608         else if (added_control) {
6609                 int num_out = 0, reason = 0, now_filled = 0;
6610                 struct timeval now;
6611                 int frag_point;
6612
6613                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6614                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6615                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6616         }
6617 no_chunk_output:
6618         if (ret) {
6619                 ca->cnt_failed++;
6620         } else {
6621                 ca->cnt_sent++;
6622         }
6623 }
6624
6625 static void
6626 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6627 {
6628         struct sctp_copy_all *ca;
6629
6630         ca = (struct sctp_copy_all *)ptr;
6631         /*
6632          * Do a notify here? Kacheong suggests that the notify be done at
6633          * the send time.. so you would push up a notification if any send
6634          * failed. Don't know if this is feasable since the only failures we
6635          * have is "memory" related and if you cannot get an mbuf to send
6636          * the data you surely can't get an mbuf to send up to notify the
6637          * user you can't send the data :->
6638          */
6639
6640         /* now free everything */
6641         sctp_m_freem(ca->m);
6642         SCTP_FREE(ca, SCTP_M_COPYAL);
6643 }
6644
6645
6646 #define MC_ALIGN(m, len) do {                                           \
6647         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6648 } while (0)
6649
6650
6651
6652 static struct mbuf *
6653 sctp_copy_out_all(struct uio *uio, int len)
6654 {
6655         struct mbuf *ret, *at;
6656         int left, willcpy, cancpy, error;
6657
6658         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6659         if (ret == NULL) {
6660                 /* TSNH */
6661                 return (NULL);
6662         }
6663         left = len;
6664         SCTP_BUF_LEN(ret) = 0;
6665         /* save space for the data chunk header */
6666         cancpy = M_TRAILINGSPACE(ret);
6667         willcpy = min(cancpy, left);
6668         at = ret;
6669         while (left > 0) {
6670                 /* Align data to the end */
6671                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6672                 if (error) {
6673         err_out_now:
6674                         sctp_m_freem(at);
6675                         return (NULL);
6676                 }
6677                 SCTP_BUF_LEN(at) = willcpy;
6678                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6679                 left -= willcpy;
6680                 if (left > 0) {
6681                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6682                         if (SCTP_BUF_NEXT(at) == NULL) {
6683                                 goto err_out_now;
6684                         }
6685                         at = SCTP_BUF_NEXT(at);
6686                         SCTP_BUF_LEN(at) = 0;
6687                         cancpy = M_TRAILINGSPACE(at);
6688                         willcpy = min(cancpy, left);
6689                 }
6690         }
6691         return (ret);
6692 }
6693
6694 static int
6695 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6696     struct sctp_sndrcvinfo *srcv)
6697 {
6698         int ret;
6699         struct sctp_copy_all *ca;
6700
6701         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6702             SCTP_M_COPYAL);
6703         if (ca == NULL) {
6704                 sctp_m_freem(m);
6705                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6706                 return (ENOMEM);
6707         }
6708         memset(ca, 0, sizeof(struct sctp_copy_all));
6709
6710         ca->inp = inp;
6711         if (srcv) {
6712                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6713         }
6714         /*
6715          * take off the sendall flag, it would be bad if we failed to do
6716          * this :-0
6717          */
6718         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6719         /* get length and mbuf chain */
6720         if (uio) {
6721                 ca->sndlen = uio->uio_resid;
6722                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6723                 if (ca->m == NULL) {
6724                         SCTP_FREE(ca, SCTP_M_COPYAL);
6725                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6726                         return (ENOMEM);
6727                 }
6728         } else {
6729                 /* Gather the length of the send */
6730                 struct mbuf *mat;
6731
6732                 mat = m;
6733                 ca->sndlen = 0;
6734                 while (m) {
6735                         ca->sndlen += SCTP_BUF_LEN(m);
6736                         m = SCTP_BUF_NEXT(m);
6737                 }
6738                 ca->m = mat;
6739         }
6740         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6741             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6742             SCTP_ASOC_ANY_STATE,
6743             (void *)ca, 0,
6744             sctp_sendall_completes, inp, 1);
6745         if (ret) {
6746                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6747                 SCTP_FREE(ca, SCTP_M_COPYAL);
6748                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6749                 return (EFAULT);
6750         }
6751         return (0);
6752 }
6753
6754
6755 void
6756 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6757 {
6758         struct sctp_tmit_chunk *chk, *nchk;
6759
6760         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6761                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6762                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6763                         if (chk->data) {
6764                                 sctp_m_freem(chk->data);
6765                                 chk->data = NULL;
6766                         }
6767                         asoc->ctrl_queue_cnt--;
6768                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6769                 }
6770         }
6771 }
6772
6773 void
6774 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6775 {
6776         struct sctp_association *asoc;
6777         struct sctp_tmit_chunk *chk, *nchk;
6778         struct sctp_asconf_chunk *acp;
6779
6780         asoc = &stcb->asoc;
6781         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6782                 /* find SCTP_ASCONF chunk in queue */
6783                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6784                         if (chk->data) {
6785                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6786                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6787                                         /* Not Acked yet */
6788                                         break;
6789                                 }
6790                         }
6791                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6792                         if (chk->data) {
6793                                 sctp_m_freem(chk->data);
6794                                 chk->data = NULL;
6795                         }
6796                         asoc->ctrl_queue_cnt--;
6797                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6798                 }
6799         }
6800 }
6801
6802
6803 static void
6804 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6805     struct sctp_association *asoc,
6806     struct sctp_tmit_chunk **data_list,
6807     int bundle_at,
6808     struct sctp_nets *net)
6809 {
6810         int i;
6811         struct sctp_tmit_chunk *tp1;
6812
6813         for (i = 0; i < bundle_at; i++) {
6814                 /* off of the send queue */
6815                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6816                 asoc->send_queue_cnt--;
6817                 if (i > 0) {
6818                         /*
6819                          * Any chunk NOT 0 you zap the time chunk 0 gets
6820                          * zapped or set based on if a RTO measurment is
6821                          * needed.
6822                          */
6823                         data_list[i]->do_rtt = 0;
6824                 }
6825                 /* record time */
6826                 data_list[i]->sent_rcv_time = net->last_sent_time;
6827                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6828                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6829                 if (data_list[i]->whoTo == NULL) {
6830                         data_list[i]->whoTo = net;
6831                         atomic_add_int(&net->ref_count, 1);
6832                 }
6833                 /* on to the sent queue */
6834                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6835                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6836                         struct sctp_tmit_chunk *tpp;
6837
6838                         /* need to move back */
6839         back_up_more:
6840                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6841                         if (tpp == NULL) {
6842                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6843                                 goto all_done;
6844                         }
6845                         tp1 = tpp;
6846                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6847                                 goto back_up_more;
6848                         }
6849                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6850                 } else {
6851                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6852                             data_list[i],
6853                             sctp_next);
6854                 }
6855 all_done:
6856                 /* This does not lower until the cum-ack passes it */
6857                 asoc->sent_queue_cnt++;
6858                 if ((asoc->peers_rwnd <= 0) &&
6859                     (asoc->total_flight == 0) &&
6860                     (bundle_at == 1)) {
6861                         /* Mark the chunk as being a window probe */
6862                         SCTP_STAT_INCR(sctps_windowprobed);
6863                 }
6864 #ifdef SCTP_AUDITING_ENABLED
6865                 sctp_audit_log(0xC2, 3);
6866 #endif
6867                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6868                 data_list[i]->snd_count = 1;
6869                 data_list[i]->rec.data.chunk_was_revoked = 0;
6870                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6871                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6872                             data_list[i]->whoTo->flight_size,
6873                             data_list[i]->book_size,
6874                             (uintptr_t) data_list[i]->whoTo,
6875                             data_list[i]->rec.data.TSN_seq);
6876                 }
6877                 sctp_flight_size_increase(data_list[i]);
6878                 sctp_total_flight_increase(stcb, data_list[i]);
6879                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6880                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6881                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6882                 }
6883                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6884                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6885                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6886                         /* SWS sender side engages */
6887                         asoc->peers_rwnd = 0;
6888                 }
6889         }
6890         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6891                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6892         }
6893 }
6894
6895 static void
6896 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6897 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6898     SCTP_UNUSED
6899 #endif
6900 )
6901 {
6902         struct sctp_tmit_chunk *chk, *nchk;
6903
6904         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6905                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6906                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6907                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6908                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6909                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6910                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6911                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6912                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6913                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6914                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6915                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6916                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6917                         /* Stray chunks must be cleaned up */
6918         clean_up_anyway:
6919                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6920                         if (chk->data) {
6921                                 sctp_m_freem(chk->data);
6922                                 chk->data = NULL;
6923                         }
6924                         asoc->ctrl_queue_cnt--;
6925                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6926                                 asoc->fwd_tsn_cnt--;
6927                         sctp_free_a_chunk(stcb, chk, so_locked);
6928                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6929                         /* special handling, we must look into the param */
6930                         if (chk != asoc->str_reset) {
6931                                 goto clean_up_anyway;
6932                         }
6933                 }
6934         }
6935 }
6936
6937
6938 static int
6939 sctp_can_we_split_this(struct sctp_tcb *stcb,
6940     uint32_t length,
6941     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6942 {
6943         /*
6944          * Make a decision on if I should split a msg into multiple parts.
6945          * This is only asked of incomplete messages.
6946          */
6947         if (eeor_on) {
6948                 /*
6949                  * If we are doing EEOR we need to always send it if its the
6950                  * entire thing, since it might be all the guy is putting in
6951                  * the hopper.
6952                  */
6953                 if (goal_mtu >= length) {
6954                         /*-
6955                          * If we have data outstanding,
6956                          * we get another chance when the sack
6957                          * arrives to transmit - wait for more data
6958                          */
6959                         if (stcb->asoc.total_flight == 0) {
6960                                 /*
6961                                  * If nothing is in flight, we zero the
6962                                  * packet counter.
6963                                  */
6964                                 return (length);
6965                         }
6966                         return (0);
6967
6968                 } else {
6969                         /* You can fill the rest */
6970                         return (goal_mtu);
6971                 }
6972         }
6973         /*-
6974          * For those strange folk that make the send buffer
6975          * smaller than our fragmentation point, we can't
6976          * get a full msg in so we have to allow splitting.
6977          */
6978         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6979                 return (length);
6980         }
6981         if ((length <= goal_mtu) ||
6982             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6983                 /* Sub-optimial residual don't split in non-eeor mode. */
6984                 return (0);
6985         }
6986         /*
6987          * If we reach here length is larger than the goal_mtu. Do we wish
6988          * to split it for the sake of packet putting together?
6989          */
6990         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6991                 /* Its ok to split it */
6992                 return (min(goal_mtu, frag_point));
6993         }
6994         /* Nope, can't split */
6995         return (0);
6996
6997 }
6998
6999 static uint32_t
7000 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7001     struct sctp_stream_out *strq,
7002     uint32_t goal_mtu,
7003     uint32_t frag_point,
7004     int *locked,
7005     int *giveup,
7006     int eeor_mode,
7007     int *bail,
7008     int so_locked
7009 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7010     SCTP_UNUSED
7011 #endif
7012 )
7013 {
7014         /* Move from the stream to the send_queue keeping track of the total */
7015         struct sctp_association *asoc;
7016         struct sctp_stream_queue_pending *sp;
7017         struct sctp_tmit_chunk *chk;
7018         struct sctp_data_chunk *dchkh;
7019         uint32_t to_move, length;
7020         uint8_t rcv_flags = 0;
7021         uint8_t some_taken;
7022         uint8_t send_lock_up = 0;
7023
7024         SCTP_TCB_LOCK_ASSERT(stcb);
7025         asoc = &stcb->asoc;
7026 one_more_time:
7027         /* sa_ignore FREED_MEMORY */
7028         sp = TAILQ_FIRST(&strq->outqueue);
7029         if (sp == NULL) {
7030                 *locked = 0;
7031                 if (send_lock_up == 0) {
7032                         SCTP_TCB_SEND_LOCK(stcb);
7033                         send_lock_up = 1;
7034                 }
7035                 sp = TAILQ_FIRST(&strq->outqueue);
7036                 if (sp) {
7037                         goto one_more_time;
7038                 }
7039                 if (strq->last_msg_incomplete) {
7040                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7041                             strq->stream_no,
7042                             strq->last_msg_incomplete);
7043                         strq->last_msg_incomplete = 0;
7044                 }
7045                 to_move = 0;
7046                 if (send_lock_up) {
7047                         SCTP_TCB_SEND_UNLOCK(stcb);
7048                         send_lock_up = 0;
7049                 }
7050                 goto out_of;
7051         }
7052         if ((sp->msg_is_complete) && (sp->length == 0)) {
7053                 if (sp->sender_all_done) {
7054                         /*
7055                          * We are doing differed cleanup. Last time through
7056                          * when we took all the data the sender_all_done was
7057                          * not set.
7058                          */
7059                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7060                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7061                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7062                                     sp->sender_all_done,
7063                                     sp->length,
7064                                     sp->msg_is_complete,
7065                                     sp->put_last_out,
7066                                     send_lock_up);
7067                         }
7068                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7069                                 SCTP_TCB_SEND_LOCK(stcb);
7070                                 send_lock_up = 1;
7071                         }
7072                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7073                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7074                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7075                         if (sp->net) {
7076                                 sctp_free_remote_addr(sp->net);
7077                                 sp->net = NULL;
7078                         }
7079                         if (sp->data) {
7080                                 sctp_m_freem(sp->data);
7081                                 sp->data = NULL;
7082                         }
7083                         sctp_free_a_strmoq(stcb, sp, so_locked);
7084                         /* we can't be locked to it */
7085                         *locked = 0;
7086                         stcb->asoc.locked_on_sending = NULL;
7087                         if (send_lock_up) {
7088                                 SCTP_TCB_SEND_UNLOCK(stcb);
7089                                 send_lock_up = 0;
7090                         }
7091                         /* back to get the next msg */
7092                         goto one_more_time;
7093                 } else {
7094                         /*
7095                          * sender just finished this but still holds a
7096                          * reference
7097                          */
7098                         *locked = 1;
7099                         *giveup = 1;
7100                         to_move = 0;
7101                         goto out_of;
7102                 }
7103         } else {
7104                 /* is there some to get */
7105                 if (sp->length == 0) {
7106                         /* no */
7107                         *locked = 1;
7108                         *giveup = 1;
7109                         to_move = 0;
7110                         goto out_of;
7111                 } else if (sp->discard_rest) {
7112                         if (send_lock_up == 0) {
7113                                 SCTP_TCB_SEND_LOCK(stcb);
7114                                 send_lock_up = 1;
7115                         }
7116                         /* Whack down the size */
7117                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7118                         if ((stcb->sctp_socket != NULL) && \
7119                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7120                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7121                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7122                         }
7123                         if (sp->data) {
7124                                 sctp_m_freem(sp->data);
7125                                 sp->data = NULL;
7126                                 sp->tail_mbuf = NULL;
7127                         }
7128                         sp->length = 0;
7129                         sp->some_taken = 1;
7130                         *locked = 1;
7131                         *giveup = 1;
7132                         to_move = 0;
7133                         goto out_of;
7134                 }
7135         }
7136         some_taken = sp->some_taken;
7137         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7138                 sp->msg_is_complete = 1;
7139         }
7140 re_look:
7141         length = sp->length;
7142         if (sp->msg_is_complete) {
7143                 /* The message is complete */
7144                 to_move = min(length, frag_point);
7145                 if (to_move == length) {
7146                         /* All of it fits in the MTU */
7147                         if (sp->some_taken) {
7148                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7149                                 sp->put_last_out = 1;
7150                         } else {
7151                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7152                                 sp->put_last_out = 1;
7153                         }
7154                 } else {
7155                         /* Not all of it fits, we fragment */
7156                         if (sp->some_taken == 0) {
7157                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7158                         }
7159                         sp->some_taken = 1;
7160                 }
7161         } else {
7162                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7163                 if (to_move) {
7164                         /*-
7165                          * We use a snapshot of length in case it
7166                          * is expanding during the compare.
7167                          */
7168                         uint32_t llen;
7169
7170                         llen = length;
7171                         if (to_move >= llen) {
7172                                 to_move = llen;
7173                                 if (send_lock_up == 0) {
7174                                         /*-
7175                                          * We are taking all of an incomplete msg
7176                                          * thus we need a send lock.
7177                                          */
7178                                         SCTP_TCB_SEND_LOCK(stcb);
7179                                         send_lock_up = 1;
7180                                         if (sp->msg_is_complete) {
7181                                                 /*
7182                                                  * the sender finished the
7183                                                  * msg
7184                                                  */
7185                                                 goto re_look;
7186                                         }
7187                                 }
7188                         }
7189                         if (sp->some_taken == 0) {
7190                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7191                                 sp->some_taken = 1;
7192                         }
7193                 } else {
7194                         /* Nothing to take. */
7195                         if (sp->some_taken) {
7196                                 *locked = 1;
7197                         }
7198                         *giveup = 1;
7199                         to_move = 0;
7200                         goto out_of;
7201                 }
7202         }
7203
7204         /* If we reach here, we can copy out a chunk */
7205         sctp_alloc_a_chunk(stcb, chk);
7206         if (chk == NULL) {
7207                 /* No chunk memory */
7208                 *giveup = 1;
7209                 to_move = 0;
7210                 goto out_of;
7211         }
7212         /*
7213          * Setup for unordered if needed by looking at the user sent info
7214          * flags.
7215          */
7216         if (sp->sinfo_flags & SCTP_UNORDERED) {
7217                 rcv_flags |= SCTP_DATA_UNORDERED;
7218         }
7219         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7220             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7221                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7222         }
7223         /* clear out the chunk before setting up */
7224         memset(chk, 0, sizeof(*chk));
7225         chk->rec.data.rcv_flags = rcv_flags;
7226
7227         if (to_move >= length) {
7228                 /* we think we can steal the whole thing */
7229                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7230                         SCTP_TCB_SEND_LOCK(stcb);
7231                         send_lock_up = 1;
7232                 }
7233                 if (to_move < sp->length) {
7234                         /* bail, it changed */
7235                         goto dont_do_it;
7236                 }
7237                 chk->data = sp->data;
7238                 chk->last_mbuf = sp->tail_mbuf;
7239                 /* register the stealing */
7240                 sp->data = sp->tail_mbuf = NULL;
7241         } else {
7242                 struct mbuf *m;
7243
7244 dont_do_it:
7245                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7246                 chk->last_mbuf = NULL;
7247                 if (chk->data == NULL) {
7248                         sp->some_taken = some_taken;
7249                         sctp_free_a_chunk(stcb, chk, so_locked);
7250                         *bail = 1;
7251                         to_move = 0;
7252                         goto out_of;
7253                 }
7254 #ifdef SCTP_MBUF_LOGGING
7255                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7256                         struct mbuf *mat;
7257
7258                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7259                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7260                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7261                                 }
7262                         }
7263                 }
7264 #endif
7265                 /* Pull off the data */
7266                 m_adj(sp->data, to_move);
7267                 /* Now lets work our way down and compact it */
7268                 m = sp->data;
7269                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7270                         sp->data = SCTP_BUF_NEXT(m);
7271                         SCTP_BUF_NEXT(m) = NULL;
7272                         if (sp->tail_mbuf == m) {
7273                                 /*-
7274                                  * Freeing tail? TSNH since
7275                                  * we supposedly were taking less
7276                                  * than the sp->length.
7277                                  */
7278 #ifdef INVARIANTS
7279                                 panic("Huh, freing tail? - TSNH");
7280 #else
7281                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7282                                 sp->tail_mbuf = sp->data = NULL;
7283                                 sp->length = 0;
7284 #endif
7285
7286                         }
7287                         sctp_m_free(m);
7288                         m = sp->data;
7289                 }
7290         }
7291         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7292                 chk->copy_by_ref = 1;
7293         } else {
7294                 chk->copy_by_ref = 0;
7295         }
7296         /*
7297          * get last_mbuf and counts of mb useage This is ugly but hopefully
7298          * its only one mbuf.
7299          */
7300         if (chk->last_mbuf == NULL) {
7301                 chk->last_mbuf = chk->data;
7302                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7303                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7304                 }
7305         }
7306         if (to_move > length) {
7307                 /*- This should not happen either
7308                  * since we always lower to_move to the size
7309                  * of sp->length if its larger.
7310                  */
7311 #ifdef INVARIANTS
7312                 panic("Huh, how can to_move be larger?");
7313 #else
7314                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7315                 sp->length = 0;
7316 #endif
7317         } else {
7318                 atomic_subtract_int(&sp->length, to_move);
7319         }
7320         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7321                 /* Not enough room for a chunk header, get some */
7322                 struct mbuf *m;
7323
7324                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7325                 if (m == NULL) {
7326                         /*
7327                          * we're in trouble here. _PREPEND below will free
7328                          * all the data if there is no leading space, so we
7329                          * must put the data back and restore.
7330                          */
7331                         if (send_lock_up == 0) {
7332                                 SCTP_TCB_SEND_LOCK(stcb);
7333                                 send_lock_up = 1;
7334                         }
7335                         if (chk->data == NULL) {
7336                                 /* unsteal the data */
7337                                 sp->data = chk->data;
7338                                 sp->tail_mbuf = chk->last_mbuf;
7339                         } else {
7340                                 struct mbuf *m_tmp;
7341
7342                                 /* reassemble the data */
7343                                 m_tmp = sp->data;
7344                                 sp->data = chk->data;
7345                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7346                         }
7347                         sp->some_taken = some_taken;
7348                         atomic_add_int(&sp->length, to_move);
7349                         chk->data = NULL;
7350                         *bail = 1;
7351                         sctp_free_a_chunk(stcb, chk, so_locked);
7352                         to_move = 0;
7353                         goto out_of;
7354                 } else {
7355                         SCTP_BUF_LEN(m) = 0;
7356                         SCTP_BUF_NEXT(m) = chk->data;
7357                         chk->data = m;
7358                         M_ALIGN(chk->data, 4);
7359                 }
7360         }
7361         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7362         if (chk->data == NULL) {
7363                 /* HELP, TSNH since we assured it would not above? */
7364 #ifdef INVARIANTS
7365                 panic("prepend failes HELP?");
7366 #else
7367                 SCTP_PRINTF("prepend fails HELP?\n");
7368                 sctp_free_a_chunk(stcb, chk, so_locked);
7369 #endif
7370                 *bail = 1;
7371                 to_move = 0;
7372                 goto out_of;
7373         }
7374         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7375         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7376         chk->book_size_scale = 0;
7377         chk->sent = SCTP_DATAGRAM_UNSENT;
7378
7379         chk->flags = 0;
7380         chk->asoc = &stcb->asoc;
7381         chk->pad_inplace = 0;
7382         chk->no_fr_allowed = 0;
7383         chk->rec.data.stream_seq = strq->next_sequence_send;
7384         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7385                 strq->next_sequence_send++;
7386         }
7387         chk->rec.data.stream_number = sp->stream;
7388         chk->rec.data.payloadtype = sp->ppid;
7389         chk->rec.data.context = sp->context;
7390         chk->rec.data.doing_fast_retransmit = 0;
7391
7392         chk->rec.data.timetodrop = sp->ts;
7393         chk->flags = sp->act_flags;
7394
7395         if (sp->net) {
7396                 chk->whoTo = sp->net;
7397                 atomic_add_int(&chk->whoTo->ref_count, 1);
7398         } else
7399                 chk->whoTo = NULL;
7400
7401         if (sp->holds_key_ref) {
7402                 chk->auth_keyid = sp->auth_keyid;
7403                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7404                 chk->holds_key_ref = 1;
7405         }
7406         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7407         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7408                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7409                     (uintptr_t) stcb, sp->length,
7410                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7411                     chk->rec.data.TSN_seq);
7412         }
7413         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7414         /*
7415          * Put the rest of the things in place now. Size was done earlier in
7416          * previous loop prior to padding.
7417          */
7418
7419 #ifdef SCTP_ASOCLOG_OF_TSNS
7420         SCTP_TCB_LOCK_ASSERT(stcb);
7421         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7422                 asoc->tsn_out_at = 0;
7423                 asoc->tsn_out_wrapped = 1;
7424         }
7425         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7426         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7427         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7428         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7429         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7430         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7431         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7432         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7433         asoc->tsn_out_at++;
7434 #endif
7435
7436         dchkh->ch.chunk_type = SCTP_DATA;
7437         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7438         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7439         dchkh->dp.stream_id = htons(strq->stream_no);
7440         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7441         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7442         dchkh->ch.chunk_length = htons(chk->send_size);
7443         /* Now advance the chk->send_size by the actual pad needed. */
7444         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7445                 /* need a pad */
7446                 struct mbuf *lm;
7447                 int pads;
7448
7449                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7450                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7451                         chk->pad_inplace = 1;
7452                 }
7453                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7454                         /* pad added an mbuf */
7455                         chk->last_mbuf = lm;
7456                 }
7457                 chk->send_size += pads;
7458         }
7459         /* We only re-set the policy if it is on */
7460         if (sp->pr_sctp_on) {
7461                 sctp_set_prsctp_policy(sp);
7462                 asoc->pr_sctp_cnt++;
7463                 chk->pr_sctp_on = 1;
7464         } else {
7465                 chk->pr_sctp_on = 0;
7466         }
7467         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7468                 /* All done pull and kill the message */
7469                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7470                 if (sp->put_last_out == 0) {
7471                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7472                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7473                             sp->sender_all_done,
7474                             sp->length,
7475                             sp->msg_is_complete,
7476                             sp->put_last_out,
7477                             send_lock_up);
7478                 }
7479                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7480                         SCTP_TCB_SEND_LOCK(stcb);
7481                         send_lock_up = 1;
7482                 }
7483                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7484                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7485                 if (sp->net) {
7486                         sctp_free_remote_addr(sp->net);
7487                         sp->net = NULL;
7488                 }
7489                 if (sp->data) {
7490                         sctp_m_freem(sp->data);
7491                         sp->data = NULL;
7492                 }
7493                 sctp_free_a_strmoq(stcb, sp, so_locked);
7494
7495                 /* we can't be locked to it */
7496                 *locked = 0;
7497                 stcb->asoc.locked_on_sending = NULL;
7498         } else {
7499                 /* more to go, we are locked */
7500                 *locked = 1;
7501         }
7502         asoc->chunks_on_out_queue++;
7503         strq->chunks_on_queues++;
7504         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7505         asoc->send_queue_cnt++;
7506 out_of:
7507         if (send_lock_up) {
7508                 SCTP_TCB_SEND_UNLOCK(stcb);
7509         }
7510         return (to_move);
7511 }
7512
7513
7514 static void
7515 sctp_fill_outqueue(struct sctp_tcb *stcb,
7516     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7517 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7518     SCTP_UNUSED
7519 #endif
7520 )
7521 {
7522         struct sctp_association *asoc;
7523         struct sctp_stream_out *strq;
7524         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7525         int locked, giveup;
7526
7527         SCTP_TCB_LOCK_ASSERT(stcb);
7528         asoc = &stcb->asoc;
7529         switch (net->ro._l_addr.sa.sa_family) {
7530 #ifdef INET
7531         case AF_INET:
7532                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7533                 break;
7534 #endif
7535 #ifdef INET6
7536         case AF_INET6:
7537                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7538                 break;
7539 #endif
7540         default:
7541                 /* TSNH */
7542                 goal_mtu = net->mtu;
7543                 break;
7544         }
7545         /* Need an allowance for the data chunk header too */
7546         goal_mtu -= sizeof(struct sctp_data_chunk);
7547
7548         /* must make even word boundary */
7549         goal_mtu &= 0xfffffffc;
7550         if (asoc->locked_on_sending) {
7551                 /* We are stuck on one stream until the message completes. */
7552                 strq = asoc->locked_on_sending;
7553                 locked = 1;
7554         } else {
7555                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7556                 locked = 0;
7557         }
7558         while ((goal_mtu > 0) && strq) {
7559                 giveup = 0;
7560                 bail = 0;
7561                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7562                     &giveup, eeor_mode, &bail, so_locked);
7563                 if (moved_how_much)
7564                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7565
7566                 if (locked) {
7567                         asoc->locked_on_sending = strq;
7568                         if ((moved_how_much == 0) || (giveup) || bail)
7569                                 /* no more to move for now */
7570                                 break;
7571                 } else {
7572                         asoc->locked_on_sending = NULL;
7573                         if ((giveup) || bail) {
7574                                 break;
7575                         }
7576                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7577                         if (strq == NULL) {
7578                                 break;
7579                         }
7580                 }
7581                 total_moved += moved_how_much;
7582                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7583                 goal_mtu &= 0xfffffffc;
7584         }
7585         if (bail)
7586                 *quit_now = 1;
7587
7588         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7589
7590         if (total_moved == 0) {
7591                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7592                     (net == stcb->asoc.primary_destination)) {
7593                         /* ran dry for primary network net */
7594                         SCTP_STAT_INCR(sctps_primary_randry);
7595                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7596                         /* ran dry with CMT on */
7597                         SCTP_STAT_INCR(sctps_cmt_randry);
7598                 }
7599         }
7600 }
7601
7602 void
7603 sctp_fix_ecn_echo(struct sctp_association *asoc)
7604 {
7605         struct sctp_tmit_chunk *chk;
7606
7607         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7608                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7609                         chk->sent = SCTP_DATAGRAM_UNSENT;
7610                 }
7611         }
7612 }
7613
7614 void
7615 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7616 {
7617         struct sctp_association *asoc;
7618         struct sctp_tmit_chunk *chk;
7619         struct sctp_stream_queue_pending *sp;
7620         unsigned int i;
7621
7622         if (net == NULL) {
7623                 return;
7624         }
7625         asoc = &stcb->asoc;
7626         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7627                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7628                         if (sp->net == net) {
7629                                 sctp_free_remote_addr(sp->net);
7630                                 sp->net = NULL;
7631                         }
7632                 }
7633         }
7634         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7635                 if (chk->whoTo == net) {
7636                         sctp_free_remote_addr(chk->whoTo);
7637                         chk->whoTo = NULL;
7638                 }
7639         }
7640 }
7641
7642 int
7643 sctp_med_chunk_output(struct sctp_inpcb *inp,
7644     struct sctp_tcb *stcb,
7645     struct sctp_association *asoc,
7646     int *num_out,
7647     int *reason_code,
7648     int control_only, int from_where,
7649     struct timeval *now, int *now_filled, int frag_point, int so_locked
7650 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7651     SCTP_UNUSED
7652 #endif
7653 )
7654 {
7655         /*
7656          * Ok this is the generic chunk service queue. we must do the
7657          * following: - Service the stream queue that is next, moving any
7658          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7659          * LAST to the out queue in one pass) and assigning TSN's - Check to
7660          * see if the cwnd/rwnd allows any output, if so we go ahead and
7661          * fomulate and send the low level chunks. Making sure to combine
7662          * any control in the control chunk queue also.
7663          */
7664         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7665         struct mbuf *outchain, *endoutchain;
7666         struct sctp_tmit_chunk *chk, *nchk;
7667
7668         /* temp arrays for unlinking */
7669         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7670         int no_fragmentflg, error;
7671         unsigned int max_rwnd_per_dest, max_send_per_dest;
7672         int one_chunk, hbflag, skip_data_for_this_net;
7673         int asconf, cookie, no_out_cnt;
7674         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7675         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7676         int tsns_sent = 0;
7677         uint32_t auth_offset = 0;
7678         struct sctp_auth_chunk *auth = NULL;
7679         uint16_t auth_keyid;
7680         int override_ok = 1;
7681         int skip_fill_up = 0;
7682         int data_auth_reqd = 0;
7683
7684         /*
7685          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7686          * destination.
7687          */
7688         int quit_now = 0;
7689
7690         *num_out = 0;
7691         auth_keyid = stcb->asoc.authinfo.active_keyid;
7692
7693         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7694             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7695             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7696                 eeor_mode = 1;
7697         } else {
7698                 eeor_mode = 0;
7699         }
7700         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7701         /*
7702          * First lets prime the pump. For each destination, if there is room
7703          * in the flight size, attempt to pull an MTU's worth out of the
7704          * stream queues into the general send_queue
7705          */
7706 #ifdef SCTP_AUDITING_ENABLED
7707         sctp_audit_log(0xC2, 2);
7708 #endif
7709         SCTP_TCB_LOCK_ASSERT(stcb);
7710         hbflag = 0;
7711         if ((control_only) || (asoc->stream_reset_outstanding))
7712                 no_data_chunks = 1;
7713         else
7714                 no_data_chunks = 0;
7715
7716         /* Nothing to possible to send? */
7717         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7718             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7719             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7720             TAILQ_EMPTY(&asoc->send_queue) &&
7721             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7722 nothing_to_send:
7723                 *reason_code = 9;
7724                 return (0);
7725         }
7726         if (asoc->peers_rwnd == 0) {
7727                 /* No room in peers rwnd */
7728                 *reason_code = 1;
7729                 if (asoc->total_flight > 0) {
7730                         /* we are allowed one chunk in flight */
7731                         no_data_chunks = 1;
7732                 }
7733         }
7734         if (stcb->asoc.ecn_echo_cnt_onq) {
7735                 /* Record where a sack goes, if any */
7736                 if (no_data_chunks &&
7737                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7738                         /* Nothing but ECNe to send - we don't do that */
7739                         goto nothing_to_send;
7740                 }
7741                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7742                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7743                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7744                                 sack_goes_to = chk->whoTo;
7745                                 break;
7746                         }
7747                 }
7748         }
7749         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7750         if (stcb->sctp_socket)
7751                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7752         else
7753                 max_send_per_dest = 0;
7754         if (no_data_chunks == 0) {
7755                 /* How many non-directed chunks are there? */
7756                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7757                         if (chk->whoTo == NULL) {
7758                                 /*
7759                                  * We already have non-directed chunks on
7760                                  * the queue, no need to do a fill-up.
7761                                  */
7762                                 skip_fill_up = 1;
7763                                 break;
7764                         }
7765                 }
7766
7767         }
7768         if ((no_data_chunks == 0) &&
7769             (skip_fill_up == 0) &&
7770             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7771                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7772                         /*
7773                          * This for loop we are in takes in each net, if
7774                          * its's got space in cwnd and has data sent to it
7775                          * (when CMT is off) then it calls
7776                          * sctp_fill_outqueue for the net. This gets data on
7777                          * the send queue for that network.
7778                          *
7779                          * In sctp_fill_outqueue TSN's are assigned and data is
7780                          * copied out of the stream buffers. Note mostly
7781                          * copy by reference (we hope).
7782                          */
7783                         net->window_probe = 0;
7784                         if ((net != stcb->asoc.alternate) &&
7785                             ((net->dest_state & SCTP_ADDR_PF) ||
7786                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7787                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7788                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7789                                         sctp_log_cwnd(stcb, net, 1,
7790                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7791                                 }
7792                                 continue;
7793                         }
7794                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7795                             (net->flight_size == 0)) {
7796                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7797                         }
7798                         if (net->flight_size >= net->cwnd) {
7799                                 /* skip this network, no room - can't fill */
7800                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7801                                         sctp_log_cwnd(stcb, net, 3,
7802                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7803                                 }
7804                                 continue;
7805                         }
7806                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7807                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7808                         }
7809                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7810                         if (quit_now) {
7811                                 /* memory alloc failure */
7812                                 no_data_chunks = 1;
7813                                 break;
7814                         }
7815                 }
7816         }
7817         /* now service each destination and send out what we can for it */
7818         /* Nothing to send? */
7819         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7820             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7821             TAILQ_EMPTY(&asoc->send_queue)) {
7822                 *reason_code = 8;
7823                 return (0);
7824         }
7825         if (asoc->sctp_cmt_on_off > 0) {
7826                 /* get the last start point */
7827                 start_at = asoc->last_net_cmt_send_started;
7828                 if (start_at == NULL) {
7829                         /* null so to beginning */
7830                         start_at = TAILQ_FIRST(&asoc->nets);
7831                 } else {
7832                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7833                         if (start_at == NULL) {
7834                                 start_at = TAILQ_FIRST(&asoc->nets);
7835                         }
7836                 }
7837                 asoc->last_net_cmt_send_started = start_at;
7838         } else {
7839                 start_at = TAILQ_FIRST(&asoc->nets);
7840         }
7841         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7842                 if (chk->whoTo == NULL) {
7843                         if (asoc->alternate) {
7844                                 chk->whoTo = asoc->alternate;
7845                         } else {
7846                                 chk->whoTo = asoc->primary_destination;
7847                         }
7848                         atomic_add_int(&chk->whoTo->ref_count, 1);
7849                 }
7850         }
7851         old_start_at = NULL;
7852 again_one_more_time:
7853         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7854                 /* how much can we send? */
7855                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7856                 if (old_start_at && (old_start_at == net)) {
7857                         /* through list ocmpletely. */
7858                         break;
7859                 }
7860                 tsns_sent = 0xa;
7861                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7862                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7863                     (net->flight_size >= net->cwnd)) {
7864                         /*
7865                          * Nothing on control or asconf and flight is full,
7866                          * we can skip even in the CMT case.
7867                          */
7868                         continue;
7869                 }
7870                 bundle_at = 0;
7871                 endoutchain = outchain = NULL;
7872                 no_fragmentflg = 1;
7873                 one_chunk = 0;
7874                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7875                         skip_data_for_this_net = 1;
7876                 } else {
7877                         skip_data_for_this_net = 0;
7878                 }
7879                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7880                         /*
7881                          * if we have a route and an ifp check to see if we
7882                          * have room to send to this guy
7883                          */
7884                         struct ifnet *ifp;
7885
7886                         ifp = net->ro.ro_rt->rt_ifp;
7887                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7888                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7889                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7890                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7891                                 }
7892                                 continue;
7893                         }
7894                 }
7895                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7896 #ifdef INET
7897                 case AF_INET:
7898                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7899                         break;
7900 #endif
7901 #ifdef INET6
7902                 case AF_INET6:
7903                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7904                         break;
7905 #endif
7906                 default:
7907                         /* TSNH */
7908                         mtu = net->mtu;
7909                         break;
7910                 }
7911                 mx_mtu = mtu;
7912                 to_out = 0;
7913                 if (mtu > asoc->peers_rwnd) {
7914                         if (asoc->total_flight > 0) {
7915                                 /* We have a packet in flight somewhere */
7916                                 r_mtu = asoc->peers_rwnd;
7917                         } else {
7918                                 /* We are always allowed to send one MTU out */
7919                                 one_chunk = 1;
7920                                 r_mtu = mtu;
7921                         }
7922                 } else {
7923                         r_mtu = mtu;
7924                 }
7925                 /************************/
7926                 /* ASCONF transmission */
7927                 /************************/
7928                 /* Now first lets go through the asconf queue */
7929                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7930                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7931                                 continue;
7932                         }
7933                         if (chk->whoTo == NULL) {
7934                                 if (asoc->alternate == NULL) {
7935                                         if (asoc->primary_destination != net) {
7936                                                 break;
7937                                         }
7938                                 } else {
7939                                         if (asoc->alternate != net) {
7940                                                 break;
7941                                         }
7942                                 }
7943                         } else {
7944                                 if (chk->whoTo != net) {
7945                                         break;
7946                                 }
7947                         }
7948                         if (chk->data == NULL) {
7949                                 break;
7950                         }
7951                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7952                             chk->sent != SCTP_DATAGRAM_RESEND) {
7953                                 break;
7954                         }
7955                         /*
7956                          * if no AUTH is yet included and this chunk
7957                          * requires it, make sure to account for it.  We
7958                          * don't apply the size until the AUTH chunk is
7959                          * actually added below in case there is no room for
7960                          * this chunk. NOTE: we overload the use of "omtu"
7961                          * here
7962                          */
7963                         if ((auth == NULL) &&
7964                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7965                             stcb->asoc.peer_auth_chunks)) {
7966                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7967                         } else
7968                                 omtu = 0;
7969                         /* Here we do NOT factor the r_mtu */
7970                         if ((chk->send_size < (int)(mtu - omtu)) ||
7971                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7972                                 /*
7973                                  * We probably should glom the mbuf chain
7974                                  * from the chk->data for control but the
7975                                  * problem is it becomes yet one more level
7976                                  * of tracking to do if for some reason
7977                                  * output fails. Then I have got to
7978                                  * reconstruct the merged control chain.. el
7979                                  * yucko.. for now we take the easy way and
7980                                  * do the copy
7981                                  */
7982                                 /*
7983                                  * Add an AUTH chunk, if chunk requires it
7984                                  * save the offset into the chain for AUTH
7985                                  */
7986                                 if ((auth == NULL) &&
7987                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7988                                     stcb->asoc.peer_auth_chunks))) {
7989                                         outchain = sctp_add_auth_chunk(outchain,
7990                                             &endoutchain,
7991                                             &auth,
7992                                             &auth_offset,
7993                                             stcb,
7994                                             chk->rec.chunk_id.id);
7995                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7996                                 }
7997                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7998                                     (int)chk->rec.chunk_id.can_take_data,
7999                                     chk->send_size, chk->copy_by_ref);
8000                                 if (outchain == NULL) {
8001                                         *reason_code = 8;
8002                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8003                                         return (ENOMEM);
8004                                 }
8005                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8006                                 /* update our MTU size */
8007                                 if (mtu > (chk->send_size + omtu))
8008                                         mtu -= (chk->send_size + omtu);
8009                                 else
8010                                         mtu = 0;
8011                                 to_out += (chk->send_size + omtu);
8012                                 /* Do clear IP_DF ? */
8013                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8014                                         no_fragmentflg = 0;
8015                                 }
8016                                 if (chk->rec.chunk_id.can_take_data)
8017                                         chk->data = NULL;
8018                                 /*
8019                                  * set hb flag since we can use these for
8020                                  * RTO
8021                                  */
8022                                 hbflag = 1;
8023                                 asconf = 1;
8024                                 /*
8025                                  * should sysctl this: don't bundle data
8026                                  * with ASCONF since it requires AUTH
8027                                  */
8028                                 no_data_chunks = 1;
8029                                 chk->sent = SCTP_DATAGRAM_SENT;
8030                                 if (chk->whoTo == NULL) {
8031                                         chk->whoTo = net;
8032                                         atomic_add_int(&net->ref_count, 1);
8033                                 }
8034                                 chk->snd_count++;
8035                                 if (mtu == 0) {
8036                                         /*
8037                                          * Ok we are out of room but we can
8038                                          * output without effecting the
8039                                          * flight size since this little guy
8040                                          * is a control only packet.
8041                                          */
8042                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8043                                         /*
8044                                          * do NOT clear the asconf flag as
8045                                          * it is used to do appropriate
8046                                          * source address selection.
8047                                          */
8048                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8049                                             (struct sockaddr *)&net->ro._l_addr,
8050                                             outchain, auth_offset, auth,
8051                                             stcb->asoc.authinfo.active_keyid,
8052                                             no_fragmentflg, 0, asconf,
8053                                             inp->sctp_lport, stcb->rport,
8054                                             htonl(stcb->asoc.peer_vtag),
8055                                             net->port, NULL,
8056                                             0, 0,
8057                                             so_locked))) {
8058                                                 if (error == ENOBUFS) {
8059                                                         asoc->ifp_had_enobuf = 1;
8060                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8061                                                 }
8062                                                 if (from_where == 0) {
8063                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8064                                                 }
8065                                                 if (*now_filled == 0) {
8066                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8067                                                         *now_filled = 1;
8068                                                         *now = net->last_sent_time;
8069                                                 } else {
8070                                                         net->last_sent_time = *now;
8071                                                 }
8072                                                 hbflag = 0;
8073                                                 /* error, could not output */
8074                                                 if (error == EHOSTUNREACH) {
8075                                                         /*
8076                                                          * Destination went
8077                                                          * unreachable
8078                                                          * during this send
8079                                                          */
8080                                                         sctp_move_chunks_from_net(stcb, net);
8081                                                 }
8082                                                 *reason_code = 7;
8083                                                 continue;
8084                                         } else
8085                                                 asoc->ifp_had_enobuf = 0;
8086                                         if (*now_filled == 0) {
8087                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8088                                                 *now_filled = 1;
8089                                                 *now = net->last_sent_time;
8090                                         } else {
8091                                                 net->last_sent_time = *now;
8092                                         }
8093                                         hbflag = 0;
8094                                         /*
8095                                          * increase the number we sent, if a
8096                                          * cookie is sent we don't tell them
8097                                          * any was sent out.
8098                                          */
8099                                         outchain = endoutchain = NULL;
8100                                         auth = NULL;
8101                                         auth_offset = 0;
8102                                         if (!no_out_cnt)
8103                                                 *num_out += ctl_cnt;
8104                                         /* recalc a clean slate and setup */
8105                                         switch (net->ro._l_addr.sa.sa_family) {
8106 #ifdef INET
8107                                         case AF_INET:
8108                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8109                                                 break;
8110 #endif
8111 #ifdef INET6
8112                                         case AF_INET6:
8113                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8114                                                 break;
8115 #endif
8116                                         default:
8117                                                 /* TSNH */
8118                                                 mtu = net->mtu;
8119                                                 break;
8120                                         }
8121                                         to_out = 0;
8122                                         no_fragmentflg = 1;
8123                                 }
8124                         }
8125                 }
8126                 /************************/
8127                 /* Control transmission */
8128                 /************************/
8129                 /* Now first lets go through the control queue */
8130                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8131                         if ((sack_goes_to) &&
8132                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8133                             (chk->whoTo != sack_goes_to)) {
8134                                 /*
8135                                  * if we have a sack in queue, and we are
8136                                  * looking at an ecn echo that is NOT queued
8137                                  * to where the sack is going..
8138                                  */
8139                                 if (chk->whoTo == net) {
8140                                         /*
8141                                          * Don't transmit it to where its
8142                                          * going (current net)
8143                                          */
8144                                         continue;
8145                                 } else if (sack_goes_to == net) {
8146                                         /*
8147                                          * But do transmit it to this
8148                                          * address
8149                                          */
8150                                         goto skip_net_check;
8151                                 }
8152                         }
8153                         if (chk->whoTo == NULL) {
8154                                 if (asoc->alternate == NULL) {
8155                                         if (asoc->primary_destination != net) {
8156                                                 continue;
8157                                         }
8158                                 } else {
8159                                         if (asoc->alternate != net) {
8160                                                 continue;
8161                                         }
8162                                 }
8163                         } else {
8164                                 if (chk->whoTo != net) {
8165                                         continue;
8166                                 }
8167                         }
8168         skip_net_check:
8169                         if (chk->data == NULL) {
8170                                 continue;
8171                         }
8172                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8173                                 /*
8174                                  * It must be unsent. Cookies and ASCONF's
8175                                  * hang around but there timers will force
8176                                  * when marked for resend.
8177                                  */
8178                                 continue;
8179                         }
8180                         /*
8181                          * if no AUTH is yet included and this chunk
8182                          * requires it, make sure to account for it.  We
8183                          * don't apply the size until the AUTH chunk is
8184                          * actually added below in case there is no room for
8185                          * this chunk. NOTE: we overload the use of "omtu"
8186                          * here
8187                          */
8188                         if ((auth == NULL) &&
8189                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8190                             stcb->asoc.peer_auth_chunks)) {
8191                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8192                         } else
8193                                 omtu = 0;
8194                         /* Here we do NOT factor the r_mtu */
8195                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8196                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8197                                 /*
8198                                  * We probably should glom the mbuf chain
8199                                  * from the chk->data for control but the
8200                                  * problem is it becomes yet one more level
8201                                  * of tracking to do if for some reason
8202                                  * output fails. Then I have got to
8203                                  * reconstruct the merged control chain.. el
8204                                  * yucko.. for now we take the easy way and
8205                                  * do the copy
8206                                  */
8207                                 /*
8208                                  * Add an AUTH chunk, if chunk requires it
8209                                  * save the offset into the chain for AUTH
8210                                  */
8211                                 if ((auth == NULL) &&
8212                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8213                                     stcb->asoc.peer_auth_chunks))) {
8214                                         outchain = sctp_add_auth_chunk(outchain,
8215                                             &endoutchain,
8216                                             &auth,
8217                                             &auth_offset,
8218                                             stcb,
8219                                             chk->rec.chunk_id.id);
8220                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8221                                 }
8222                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8223                                     (int)chk->rec.chunk_id.can_take_data,
8224                                     chk->send_size, chk->copy_by_ref);
8225                                 if (outchain == NULL) {
8226                                         *reason_code = 8;
8227                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8228                                         return (ENOMEM);
8229                                 }
8230                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8231                                 /* update our MTU size */
8232                                 if (mtu > (chk->send_size + omtu))
8233                                         mtu -= (chk->send_size + omtu);
8234                                 else
8235                                         mtu = 0;
8236                                 to_out += (chk->send_size + omtu);
8237                                 /* Do clear IP_DF ? */
8238                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8239                                         no_fragmentflg = 0;
8240                                 }
8241                                 if (chk->rec.chunk_id.can_take_data)
8242                                         chk->data = NULL;
8243                                 /* Mark things to be removed, if needed */
8244                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8245                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8246                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8247                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8248                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8249                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8250                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8251                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8252                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8253                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8254                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8255                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8256                                                 hbflag = 1;
8257                                         }
8258                                         /* remove these chunks at the end */
8259                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8260                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8261                                                 /* turn off the timer */
8262                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8263                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8264                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8265                                                 }
8266                                         }
8267                                         ctl_cnt++;
8268                                 } else {
8269                                         /*
8270                                          * Other chunks, since they have
8271                                          * timers running (i.e. COOKIE) we
8272                                          * just "trust" that it gets sent or
8273                                          * retransmitted.
8274                                          */
8275                                         ctl_cnt++;
8276                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8277                                                 cookie = 1;
8278                                                 no_out_cnt = 1;
8279                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8280                                                 /*
8281                                                  * Increment ecne send count
8282                                                  * here this means we may be
8283                                                  * over-zealous in our
8284                                                  * counting if the send
8285                                                  * fails, but its the best
8286                                                  * place to do it (we used
8287                                                  * to do it in the queue of
8288                                                  * the chunk, but that did
8289                                                  * not tell how many times
8290                                                  * it was sent.
8291                                                  */
8292                                                 SCTP_STAT_INCR(sctps_sendecne);
8293                                         }
8294                                         chk->sent = SCTP_DATAGRAM_SENT;
8295                                         if (chk->whoTo == NULL) {
8296                                                 chk->whoTo = net;
8297                                                 atomic_add_int(&net->ref_count, 1);
8298                                         }
8299                                         chk->snd_count++;
8300                                 }
8301                                 if (mtu == 0) {
8302                                         /*
8303                                          * Ok we are out of room but we can
8304                                          * output without effecting the
8305                                          * flight size since this little guy
8306                                          * is a control only packet.
8307                                          */
8308                                         if (asconf) {
8309                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8310                                                 /*
8311                                                  * do NOT clear the asconf
8312                                                  * flag as it is used to do
8313                                                  * appropriate source
8314                                                  * address selection.
8315                                                  */
8316                                         }
8317                                         if (cookie) {
8318                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8319                                                 cookie = 0;
8320                                         }
8321                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8322                                             (struct sockaddr *)&net->ro._l_addr,
8323                                             outchain,
8324                                             auth_offset, auth,
8325                                             stcb->asoc.authinfo.active_keyid,
8326                                             no_fragmentflg, 0, asconf,
8327                                             inp->sctp_lport, stcb->rport,
8328                                             htonl(stcb->asoc.peer_vtag),
8329                                             net->port, NULL,
8330                                             0, 0,
8331                                             so_locked))) {
8332                                                 if (error == ENOBUFS) {
8333                                                         asoc->ifp_had_enobuf = 1;
8334                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8335                                                 }
8336                                                 if (from_where == 0) {
8337                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8338                                                 }
8339                                                 /* error, could not output */
8340                                                 if (hbflag) {
8341                                                         if (*now_filled == 0) {
8342                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8343                                                                 *now_filled = 1;
8344                                                                 *now = net->last_sent_time;
8345                                                         } else {
8346                                                                 net->last_sent_time = *now;
8347                                                         }
8348                                                         hbflag = 0;
8349                                                 }
8350                                                 if (error == EHOSTUNREACH) {
8351                                                         /*
8352                                                          * Destination went
8353                                                          * unreachable
8354                                                          * during this send
8355                                                          */
8356                                                         sctp_move_chunks_from_net(stcb, net);
8357                                                 }
8358                                                 *reason_code = 7;
8359                                                 continue;
8360                                         } else
8361                                                 asoc->ifp_had_enobuf = 0;
8362                                         /* Only HB or ASCONF advances time */
8363                                         if (hbflag) {
8364                                                 if (*now_filled == 0) {
8365                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8366                                                         *now_filled = 1;
8367                                                         *now = net->last_sent_time;
8368                                                 } else {
8369                                                         net->last_sent_time = *now;
8370                                                 }
8371                                                 hbflag = 0;
8372                                         }
8373                                         /*
8374                                          * increase the number we sent, if a
8375                                          * cookie is sent we don't tell them
8376                                          * any was sent out.
8377                                          */
8378                                         outchain = endoutchain = NULL;
8379                                         auth = NULL;
8380                                         auth_offset = 0;
8381                                         if (!no_out_cnt)
8382                                                 *num_out += ctl_cnt;
8383                                         /* recalc a clean slate and setup */
8384                                         switch (net->ro._l_addr.sa.sa_family) {
8385 #ifdef INET
8386                                         case AF_INET:
8387                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8388                                                 break;
8389 #endif
8390 #ifdef INET6
8391                                         case AF_INET6:
8392                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8393                                                 break;
8394 #endif
8395                                         default:
8396                                                 /* TSNH */
8397                                                 mtu = net->mtu;
8398                                                 break;
8399                                         }
8400                                         to_out = 0;
8401                                         no_fragmentflg = 1;
8402                                 }
8403                         }
8404                 }
8405                 /* JRI: if dest is in PF state, do not send data to it */
8406                 if ((asoc->sctp_cmt_on_off > 0) &&
8407                     (net != stcb->asoc.alternate) &&
8408                     (net->dest_state & SCTP_ADDR_PF)) {
8409                         goto no_data_fill;
8410                 }
8411                 if (net->flight_size >= net->cwnd) {
8412                         goto no_data_fill;
8413                 }
8414                 if ((asoc->sctp_cmt_on_off > 0) &&
8415                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8416                     (net->flight_size > max_rwnd_per_dest)) {
8417                         goto no_data_fill;
8418                 }
8419                 /*
8420                  * We need a specific accounting for the usage of the send
8421                  * buffer. We also need to check the number of messages per
8422                  * net. For now, this is better than nothing and it disabled
8423                  * by default...
8424                  */
8425                 if ((asoc->sctp_cmt_on_off > 0) &&
8426                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8427                     (max_send_per_dest > 0) &&
8428                     (net->flight_size > max_send_per_dest)) {
8429                         goto no_data_fill;
8430                 }
8431                 /*********************/
8432                 /* Data transmission */
8433                 /*********************/
8434                 /*
8435                  * if AUTH for DATA is required and no AUTH has been added
8436                  * yet, account for this in the mtu now... if no data can be
8437                  * bundled, this adjustment won't matter anyways since the
8438                  * packet will be going out...
8439                  */
8440                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8441                     stcb->asoc.peer_auth_chunks);
8442                 if (data_auth_reqd && (auth == NULL)) {
8443                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8444                 }
8445                 /* now lets add any data within the MTU constraints */
8446                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8447 #ifdef INET
8448                 case AF_INET:
8449                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8450                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8451                         else
8452                                 omtu = 0;
8453                         break;
8454 #endif
8455 #ifdef INET6
8456                 case AF_INET6:
8457                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8458                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8459                         else
8460                                 omtu = 0;
8461                         break;
8462 #endif
8463                 default:
8464                         /* TSNH */
8465                         omtu = 0;
8466                         break;
8467                 }
8468                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8469                     (skip_data_for_this_net == 0)) ||
8470                     (cookie)) {
8471                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8472                                 if (no_data_chunks) {
8473                                         /* let only control go out */
8474                                         *reason_code = 1;
8475                                         break;
8476                                 }
8477                                 if (net->flight_size >= net->cwnd) {
8478                                         /* skip this net, no room for data */
8479                                         *reason_code = 2;
8480                                         break;
8481                                 }
8482                                 if ((chk->whoTo != NULL) &&
8483                                     (chk->whoTo != net)) {
8484                                         /* Don't send the chunk on this net */
8485                                         continue;
8486                                 }
8487                                 if (asoc->sctp_cmt_on_off == 0) {
8488                                         if ((asoc->alternate) &&
8489                                             (asoc->alternate != net) &&
8490                                             (chk->whoTo == NULL)) {
8491                                                 continue;
8492                                         } else if ((net != asoc->primary_destination) &&
8493                                                     (asoc->alternate == NULL) &&
8494                                             (chk->whoTo == NULL)) {
8495                                                 continue;
8496                                         }
8497                                 }
8498                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8499                                         /*-
8500                                          * strange, we have a chunk that is
8501                                          * to big for its destination and
8502                                          * yet no fragment ok flag.
8503                                          * Something went wrong when the
8504                                          * PMTU changed...we did not mark
8505                                          * this chunk for some reason?? I
8506                                          * will fix it here by letting IP
8507                                          * fragment it for now and printing
8508                                          * a warning. This really should not
8509                                          * happen ...
8510                                          */
8511                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8512                                             chk->send_size, mtu);
8513                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8514                                 }
8515                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8516                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8517                                         struct sctp_data_chunk *dchkh;
8518
8519                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8520                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8521                                 }
8522                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8523                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8524                                         /* ok we will add this one */
8525
8526                                         /*
8527                                          * Add an AUTH chunk, if chunk
8528                                          * requires it, save the offset into
8529                                          * the chain for AUTH
8530                                          */
8531                                         if (data_auth_reqd) {
8532                                                 if (auth == NULL) {
8533                                                         outchain = sctp_add_auth_chunk(outchain,
8534                                                             &endoutchain,
8535                                                             &auth,
8536                                                             &auth_offset,
8537                                                             stcb,
8538                                                             SCTP_DATA);
8539                                                         auth_keyid = chk->auth_keyid;
8540                                                         override_ok = 0;
8541                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8542                                                 } else if (override_ok) {
8543                                                         /*
8544                                                          * use this data's
8545                                                          * keyid
8546                                                          */
8547                                                         auth_keyid = chk->auth_keyid;
8548                                                         override_ok = 0;
8549                                                 } else if (auth_keyid != chk->auth_keyid) {
8550                                                         /*
8551                                                          * different keyid,
8552                                                          * so done bundling
8553                                                          */
8554                                                         break;
8555                                                 }
8556                                         }
8557                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8558                                             chk->send_size, chk->copy_by_ref);
8559                                         if (outchain == NULL) {
8560                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8561                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8562                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8563                                                 }
8564                                                 *reason_code = 3;
8565                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8566                                                 return (ENOMEM);
8567                                         }
8568                                         /* upate our MTU size */
8569                                         /* Do clear IP_DF ? */
8570                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8571                                                 no_fragmentflg = 0;
8572                                         }
8573                                         /* unsigned subtraction of mtu */
8574                                         if (mtu > chk->send_size)
8575                                                 mtu -= chk->send_size;
8576                                         else
8577                                                 mtu = 0;
8578                                         /* unsigned subtraction of r_mtu */
8579                                         if (r_mtu > chk->send_size)
8580                                                 r_mtu -= chk->send_size;
8581                                         else
8582                                                 r_mtu = 0;
8583
8584                                         to_out += chk->send_size;
8585                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8586 #ifdef INVARIANTS
8587                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8588 #else
8589                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8590                                                     mx_mtu, to_out);
8591 #endif
8592                                         }
8593                                         chk->window_probe = 0;
8594                                         data_list[bundle_at++] = chk;
8595                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8596                                                 break;
8597                                         }
8598                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8599                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8600                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8601                                                 } else {
8602                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8603                                                 }
8604                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8605                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8606                                                         /*
8607                                                          * Count number of
8608                                                          * user msg's that
8609                                                          * were fragmented
8610                                                          * we do this by
8611                                                          * counting when we
8612                                                          * see a LAST
8613                                                          * fragment only.
8614                                                          */
8615                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8616                                         }
8617                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8618                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8619                                                         data_list[0]->window_probe = 1;
8620                                                         net->window_probe = 1;
8621                                                 }
8622                                                 break;
8623                                         }
8624                                 } else {
8625                                         /*
8626                                          * Must be sent in order of the
8627                                          * TSN's (on a network)
8628                                          */
8629                                         break;
8630                                 }
8631                         }       /* for (chunk gather loop for this net) */
8632                 }               /* if asoc.state OPEN */
8633 no_data_fill:
8634                 /* Is there something to send for this destination? */
8635                 if (outchain) {
8636                         /* We may need to start a control timer or two */
8637                         if (asconf) {
8638                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8639                                     stcb, net);
8640                                 /*
8641                                  * do NOT clear the asconf flag as it is
8642                                  * used to do appropriate source address
8643                                  * selection.
8644                                  */
8645                         }
8646                         if (cookie) {
8647                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8648                                 cookie = 0;
8649                         }
8650                         /* must start a send timer if data is being sent */
8651                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8652                                 /*
8653                                  * no timer running on this destination
8654                                  * restart it.
8655                                  */
8656                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8657                         }
8658                         /* Now send it, if there is anything to send :> */
8659                         if ((error = sctp_lowlevel_chunk_output(inp,
8660                             stcb,
8661                             net,
8662                             (struct sockaddr *)&net->ro._l_addr,
8663                             outchain,
8664                             auth_offset,
8665                             auth,
8666                             auth_keyid,
8667                             no_fragmentflg,
8668                             bundle_at,
8669                             asconf,
8670                             inp->sctp_lport, stcb->rport,
8671                             htonl(stcb->asoc.peer_vtag),
8672                             net->port, NULL,
8673                             0, 0,
8674                             so_locked))) {
8675                                 /* error, we could not output */
8676                                 if (error == ENOBUFS) {
8677                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8678                                         asoc->ifp_had_enobuf = 1;
8679                                 }
8680                                 if (from_where == 0) {
8681                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8682                                 }
8683                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8684                                 if (hbflag) {
8685                                         if (*now_filled == 0) {
8686                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8687                                                 *now_filled = 1;
8688                                                 *now = net->last_sent_time;
8689                                         } else {
8690                                                 net->last_sent_time = *now;
8691                                         }
8692                                         hbflag = 0;
8693                                 }
8694                                 if (error == EHOSTUNREACH) {
8695                                         /*
8696                                          * Destination went unreachable
8697                                          * during this send
8698                                          */
8699                                         sctp_move_chunks_from_net(stcb, net);
8700                                 }
8701                                 *reason_code = 6;
8702                                 /*-
8703                                  * I add this line to be paranoid. As far as
8704                                  * I can tell the continue, takes us back to
8705                                  * the top of the for, but just to make sure
8706                                  * I will reset these again here.
8707                                  */
8708                                 ctl_cnt = bundle_at = 0;
8709                                 continue;       /* This takes us back to the
8710                                                  * for() for the nets. */
8711                         } else {
8712                                 asoc->ifp_had_enobuf = 0;
8713                         }
8714                         endoutchain = NULL;
8715                         auth = NULL;
8716                         auth_offset = 0;
8717                         if (bundle_at || hbflag) {
8718                                 /* For data/asconf and hb set time */
8719                                 if (*now_filled == 0) {
8720                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8721                                         *now_filled = 1;
8722                                         *now = net->last_sent_time;
8723                                 } else {
8724                                         net->last_sent_time = *now;
8725                                 }
8726                         }
8727                         if (!no_out_cnt) {
8728                                 *num_out += (ctl_cnt + bundle_at);
8729                         }
8730                         if (bundle_at) {
8731                                 /* setup for a RTO measurement */
8732                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8733                                 /* fill time if not already filled */
8734                                 if (*now_filled == 0) {
8735                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8736                                         *now_filled = 1;
8737                                         *now = asoc->time_last_sent;
8738                                 } else {
8739                                         asoc->time_last_sent = *now;
8740                                 }
8741                                 if (net->rto_needed) {
8742                                         data_list[0]->do_rtt = 1;
8743                                         net->rto_needed = 0;
8744                                 }
8745                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8746                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8747                         }
8748                         if (one_chunk) {
8749                                 break;
8750                         }
8751                 }
8752                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8753                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8754                 }
8755         }
8756         if (old_start_at == NULL) {
8757                 old_start_at = start_at;
8758                 start_at = TAILQ_FIRST(&asoc->nets);
8759                 if (old_start_at)
8760                         goto again_one_more_time;
8761         }
8762         /*
8763          * At the end there should be no NON timed chunks hanging on this
8764          * queue.
8765          */
8766         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8767                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8768         }
8769         if ((*num_out == 0) && (*reason_code == 0)) {
8770                 *reason_code = 4;
8771         } else {
8772                 *reason_code = 5;
8773         }
8774         sctp_clean_up_ctl(stcb, asoc, so_locked);
8775         return (0);
8776 }
8777
8778 void
8779 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8780 {
8781         /*-
8782          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8783          * the control chunk queue.
8784          */
8785         struct sctp_chunkhdr *hdr;
8786         struct sctp_tmit_chunk *chk;
8787         struct mbuf *mat;
8788
8789         SCTP_TCB_LOCK_ASSERT(stcb);
8790         sctp_alloc_a_chunk(stcb, chk);
8791         if (chk == NULL) {
8792                 /* no memory */
8793                 sctp_m_freem(op_err);
8794                 return;
8795         }
8796         chk->copy_by_ref = 0;
8797         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8798         if (op_err == NULL) {
8799                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8800                 return;
8801         }
8802         chk->send_size = 0;
8803         mat = op_err;
8804         while (mat != NULL) {
8805                 chk->send_size += SCTP_BUF_LEN(mat);
8806                 mat = SCTP_BUF_NEXT(mat);
8807         }
8808         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8809         chk->rec.chunk_id.can_take_data = 1;
8810         chk->sent = SCTP_DATAGRAM_UNSENT;
8811         chk->snd_count = 0;
8812         chk->flags = 0;
8813         chk->asoc = &stcb->asoc;
8814         chk->data = op_err;
8815         chk->whoTo = NULL;
8816         hdr = mtod(op_err, struct sctp_chunkhdr *);
8817         hdr->chunk_type = SCTP_OPERATION_ERROR;
8818         hdr->chunk_flags = 0;
8819         hdr->chunk_length = htons(chk->send_size);
8820         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8821             chk,
8822             sctp_next);
8823         chk->asoc->ctrl_queue_cnt++;
8824 }
8825
8826 int
8827 sctp_send_cookie_echo(struct mbuf *m,
8828     int offset,
8829     struct sctp_tcb *stcb,
8830     struct sctp_nets *net)
8831 {
8832         /*-
8833          * pull out the cookie and put it at the front of the control chunk
8834          * queue.
8835          */
8836         int at;
8837         struct mbuf *cookie;
8838         struct sctp_paramhdr parm, *phdr;
8839         struct sctp_chunkhdr *hdr;
8840         struct sctp_tmit_chunk *chk;
8841         uint16_t ptype, plen;
8842
8843         /* First find the cookie in the param area */
8844         cookie = NULL;
8845         at = offset + sizeof(struct sctp_init_chunk);
8846
8847         SCTP_TCB_LOCK_ASSERT(stcb);
8848         do {
8849                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8850                 if (phdr == NULL) {
8851                         return (-3);
8852                 }
8853                 ptype = ntohs(phdr->param_type);
8854                 plen = ntohs(phdr->param_length);
8855                 if (ptype == SCTP_STATE_COOKIE) {
8856                         int pad;
8857
8858                         /* found the cookie */
8859                         if ((pad = (plen % 4))) {
8860                                 plen += 4 - pad;
8861                         }
8862                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8863                         if (cookie == NULL) {
8864                                 /* No memory */
8865                                 return (-2);
8866                         }
8867 #ifdef SCTP_MBUF_LOGGING
8868                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8869                                 struct mbuf *mat;
8870
8871                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8872                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8873                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8874                                         }
8875                                 }
8876                         }
8877 #endif
8878                         break;
8879                 }
8880                 at += SCTP_SIZE32(plen);
8881         } while (phdr);
8882         if (cookie == NULL) {
8883                 /* Did not find the cookie */
8884                 return (-3);
8885         }
8886         /* ok, we got the cookie lets change it into a cookie echo chunk */
8887
8888         /* first the change from param to cookie */
8889         hdr = mtod(cookie, struct sctp_chunkhdr *);
8890         hdr->chunk_type = SCTP_COOKIE_ECHO;
8891         hdr->chunk_flags = 0;
8892         /* get the chunk stuff now and place it in the FRONT of the queue */
8893         sctp_alloc_a_chunk(stcb, chk);
8894         if (chk == NULL) {
8895                 /* no memory */
8896                 sctp_m_freem(cookie);
8897                 return (-5);
8898         }
8899         chk->copy_by_ref = 0;
8900         chk->send_size = plen;
8901         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8902         chk->rec.chunk_id.can_take_data = 0;
8903         chk->sent = SCTP_DATAGRAM_UNSENT;
8904         chk->snd_count = 0;
8905         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8906         chk->asoc = &stcb->asoc;
8907         chk->data = cookie;
8908         chk->whoTo = net;
8909         atomic_add_int(&chk->whoTo->ref_count, 1);
8910         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8911         chk->asoc->ctrl_queue_cnt++;
8912         return (0);
8913 }
8914
8915 void
8916 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8917     struct mbuf *m,
8918     int offset,
8919     int chk_length,
8920     struct sctp_nets *net)
8921 {
8922         /*
8923          * take a HB request and make it into a HB ack and send it.
8924          */
8925         struct mbuf *outchain;
8926         struct sctp_chunkhdr *chdr;
8927         struct sctp_tmit_chunk *chk;
8928
8929
8930         if (net == NULL)
8931                 /* must have a net pointer */
8932                 return;
8933
8934         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8935         if (outchain == NULL) {
8936                 /* gak out of memory */
8937                 return;
8938         }
8939 #ifdef SCTP_MBUF_LOGGING
8940         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8941                 struct mbuf *mat;
8942
8943                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
8944                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8945                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8946                         }
8947                 }
8948         }
8949 #endif
8950         chdr = mtod(outchain, struct sctp_chunkhdr *);
8951         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8952         chdr->chunk_flags = 0;
8953         if (chk_length % 4) {
8954                 /* need pad */
8955                 uint32_t cpthis = 0;
8956                 int padlen;
8957
8958                 padlen = 4 - (chk_length % 4);
8959                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8960         }
8961         sctp_alloc_a_chunk(stcb, chk);
8962         if (chk == NULL) {
8963                 /* no memory */
8964                 sctp_m_freem(outchain);
8965                 return;
8966         }
8967         chk->copy_by_ref = 0;
8968         chk->send_size = chk_length;
8969         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8970         chk->rec.chunk_id.can_take_data = 1;
8971         chk->sent = SCTP_DATAGRAM_UNSENT;
8972         chk->snd_count = 0;
8973         chk->flags = 0;
8974         chk->asoc = &stcb->asoc;
8975         chk->data = outchain;
8976         chk->whoTo = net;
8977         atomic_add_int(&chk->whoTo->ref_count, 1);
8978         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8979         chk->asoc->ctrl_queue_cnt++;
8980 }
8981
8982 void
8983 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8984 {
8985         /* formulate and queue a cookie-ack back to sender */
8986         struct mbuf *cookie_ack;
8987         struct sctp_chunkhdr *hdr;
8988         struct sctp_tmit_chunk *chk;
8989
8990         cookie_ack = NULL;
8991         SCTP_TCB_LOCK_ASSERT(stcb);
8992
8993         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8994         if (cookie_ack == NULL) {
8995                 /* no mbuf's */
8996                 return;
8997         }
8998         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8999         sctp_alloc_a_chunk(stcb, chk);
9000         if (chk == NULL) {
9001                 /* no memory */
9002                 sctp_m_freem(cookie_ack);
9003                 return;
9004         }
9005         chk->copy_by_ref = 0;
9006         chk->send_size = sizeof(struct sctp_chunkhdr);
9007         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9008         chk->rec.chunk_id.can_take_data = 1;
9009         chk->sent = SCTP_DATAGRAM_UNSENT;
9010         chk->snd_count = 0;
9011         chk->flags = 0;
9012         chk->asoc = &stcb->asoc;
9013         chk->data = cookie_ack;
9014         if (chk->asoc->last_control_chunk_from != NULL) {
9015                 chk->whoTo = chk->asoc->last_control_chunk_from;
9016                 atomic_add_int(&chk->whoTo->ref_count, 1);
9017         } else {
9018                 chk->whoTo = NULL;
9019         }
9020         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9021         hdr->chunk_type = SCTP_COOKIE_ACK;
9022         hdr->chunk_flags = 0;
9023         hdr->chunk_length = htons(chk->send_size);
9024         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9025         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9026         chk->asoc->ctrl_queue_cnt++;
9027         return;
9028 }
9029
9030
9031 void
9032 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9033 {
9034         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9035         struct mbuf *m_shutdown_ack;
9036         struct sctp_shutdown_ack_chunk *ack_cp;
9037         struct sctp_tmit_chunk *chk;
9038
9039         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9040         if (m_shutdown_ack == NULL) {
9041                 /* no mbuf's */
9042                 return;
9043         }
9044         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9045         sctp_alloc_a_chunk(stcb, chk);
9046         if (chk == NULL) {
9047                 /* no memory */
9048                 sctp_m_freem(m_shutdown_ack);
9049                 return;
9050         }
9051         chk->copy_by_ref = 0;
9052         chk->send_size = sizeof(struct sctp_chunkhdr);
9053         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9054         chk->rec.chunk_id.can_take_data = 1;
9055         chk->sent = SCTP_DATAGRAM_UNSENT;
9056         chk->snd_count = 0;
9057         chk->flags = 0;
9058         chk->asoc = &stcb->asoc;
9059         chk->data = m_shutdown_ack;
9060         chk->whoTo = net;
9061         if (chk->whoTo) {
9062                 atomic_add_int(&chk->whoTo->ref_count, 1);
9063         }
9064         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9065         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9066         ack_cp->ch.chunk_flags = 0;
9067         ack_cp->ch.chunk_length = htons(chk->send_size);
9068         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9069         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9070         chk->asoc->ctrl_queue_cnt++;
9071         return;
9072 }
9073
9074 void
9075 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9076 {
9077         /* formulate and queue a SHUTDOWN to the sender */
9078         struct mbuf *m_shutdown;
9079         struct sctp_shutdown_chunk *shutdown_cp;
9080         struct sctp_tmit_chunk *chk;
9081
9082         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9083         if (m_shutdown == NULL) {
9084                 /* no mbuf's */
9085                 return;
9086         }
9087         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9088         sctp_alloc_a_chunk(stcb, chk);
9089         if (chk == NULL) {
9090                 /* no memory */
9091                 sctp_m_freem(m_shutdown);
9092                 return;
9093         }
9094         chk->copy_by_ref = 0;
9095         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9096         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9097         chk->rec.chunk_id.can_take_data = 1;
9098         chk->sent = SCTP_DATAGRAM_UNSENT;
9099         chk->snd_count = 0;
9100         chk->flags = 0;
9101         chk->asoc = &stcb->asoc;
9102         chk->data = m_shutdown;
9103         chk->whoTo = net;
9104         if (chk->whoTo) {
9105                 atomic_add_int(&chk->whoTo->ref_count, 1);
9106         }
9107         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9108         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9109         shutdown_cp->ch.chunk_flags = 0;
9110         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9111         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9112         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9113         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9114         chk->asoc->ctrl_queue_cnt++;
9115         return;
9116 }
9117
9118 void
9119 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9120 {
9121         /*
9122          * formulate and queue an ASCONF to the peer. ASCONF parameters
9123          * should be queued on the assoc queue.
9124          */
9125         struct sctp_tmit_chunk *chk;
9126         struct mbuf *m_asconf;
9127         int len;
9128
9129         SCTP_TCB_LOCK_ASSERT(stcb);
9130
9131         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9132             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9133                 /* can't send a new one if there is one in flight already */
9134                 return;
9135         }
9136         /* compose an ASCONF chunk, maximum length is PMTU */
9137         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9138         if (m_asconf == NULL) {
9139                 return;
9140         }
9141         sctp_alloc_a_chunk(stcb, chk);
9142         if (chk == NULL) {
9143                 /* no memory */
9144                 sctp_m_freem(m_asconf);
9145                 return;
9146         }
9147         chk->copy_by_ref = 0;
9148         chk->data = m_asconf;
9149         chk->send_size = len;
9150         chk->rec.chunk_id.id = SCTP_ASCONF;
9151         chk->rec.chunk_id.can_take_data = 0;
9152         chk->sent = SCTP_DATAGRAM_UNSENT;
9153         chk->snd_count = 0;
9154         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9155         chk->asoc = &stcb->asoc;
9156         chk->whoTo = net;
9157         if (chk->whoTo) {
9158                 atomic_add_int(&chk->whoTo->ref_count, 1);
9159         }
9160         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9161         chk->asoc->ctrl_queue_cnt++;
9162         return;
9163 }
9164
9165 void
9166 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9167 {
9168         /*
9169          * formulate and queue a asconf-ack back to sender. the asconf-ack
9170          * must be stored in the tcb.
9171          */
9172         struct sctp_tmit_chunk *chk;
9173         struct sctp_asconf_ack *ack, *latest_ack;
9174         struct mbuf *m_ack;
9175         struct sctp_nets *net = NULL;
9176
9177         SCTP_TCB_LOCK_ASSERT(stcb);
9178         /* Get the latest ASCONF-ACK */
9179         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9180         if (latest_ack == NULL) {
9181                 return;
9182         }
9183         if (latest_ack->last_sent_to != NULL &&
9184             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9185                 /* we're doing a retransmission */
9186                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9187                 if (net == NULL) {
9188                         /* no alternate */
9189                         if (stcb->asoc.last_control_chunk_from == NULL) {
9190                                 if (stcb->asoc.alternate) {
9191                                         net = stcb->asoc.alternate;
9192                                 } else {
9193                                         net = stcb->asoc.primary_destination;
9194                                 }
9195                         } else {
9196                                 net = stcb->asoc.last_control_chunk_from;
9197                         }
9198                 }
9199         } else {
9200                 /* normal case */
9201                 if (stcb->asoc.last_control_chunk_from == NULL) {
9202                         if (stcb->asoc.alternate) {
9203                                 net = stcb->asoc.alternate;
9204                         } else {
9205                                 net = stcb->asoc.primary_destination;
9206                         }
9207                 } else {
9208                         net = stcb->asoc.last_control_chunk_from;
9209                 }
9210         }
9211         latest_ack->last_sent_to = net;
9212
9213         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9214                 if (ack->data == NULL) {
9215                         continue;
9216                 }
9217                 /* copy the asconf_ack */
9218                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9219                 if (m_ack == NULL) {
9220                         /* couldn't copy it */
9221                         return;
9222                 }
9223 #ifdef SCTP_MBUF_LOGGING
9224                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9225                         struct mbuf *mat;
9226
9227                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9228                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9229                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9230                                 }
9231                         }
9232                 }
9233 #endif
9234
9235                 sctp_alloc_a_chunk(stcb, chk);
9236                 if (chk == NULL) {
9237                         /* no memory */
9238                         if (m_ack)
9239                                 sctp_m_freem(m_ack);
9240                         return;
9241                 }
9242                 chk->copy_by_ref = 0;
9243
9244                 chk->whoTo = net;
9245                 if (chk->whoTo) {
9246                         atomic_add_int(&chk->whoTo->ref_count, 1);
9247                 }
9248                 chk->data = m_ack;
9249                 chk->send_size = 0;
9250                 /* Get size */
9251                 chk->send_size = ack->len;
9252                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9253                 chk->rec.chunk_id.can_take_data = 1;
9254                 chk->sent = SCTP_DATAGRAM_UNSENT;
9255                 chk->snd_count = 0;
9256                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9257                 chk->asoc = &stcb->asoc;
9258
9259                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9260                 chk->asoc->ctrl_queue_cnt++;
9261         }
9262         return;
9263 }
9264
9265
9266 static int
9267 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9268     struct sctp_tcb *stcb,
9269     struct sctp_association *asoc,
9270     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9271 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9272     SCTP_UNUSED
9273 #endif
9274 )
9275 {
9276         /*-
9277          * send out one MTU of retransmission. If fast_retransmit is
9278          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9279          * rwnd. For a Cookie or Asconf in the control chunk queue we
9280          * retransmit them by themselves.
9281          *
9282          * For data chunks we will pick out the lowest TSN's in the sent_queue
9283          * marked for resend and bundle them all together (up to a MTU of
9284          * destination). The address to send to should have been
9285          * selected/changed where the retransmission was marked (i.e. in FR
9286          * or t3-timeout routines).
9287          */
9288         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9289         struct sctp_tmit_chunk *chk, *fwd;
9290         struct mbuf *m, *endofchain;
9291         struct sctp_nets *net = NULL;
9292         uint32_t tsns_sent = 0;
9293         int no_fragmentflg, bundle_at, cnt_thru;
9294         unsigned int mtu;
9295         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9296         struct sctp_auth_chunk *auth = NULL;
9297         uint32_t auth_offset = 0;
9298         uint16_t auth_keyid;
9299         int override_ok = 1;
9300         int data_auth_reqd = 0;
9301         uint32_t dmtu = 0;
9302
9303         SCTP_TCB_LOCK_ASSERT(stcb);
9304         tmr_started = ctl_cnt = bundle_at = error = 0;
9305         no_fragmentflg = 1;
9306         fwd_tsn = 0;
9307         *cnt_out = 0;
9308         fwd = NULL;
9309         endofchain = m = NULL;
9310         auth_keyid = stcb->asoc.authinfo.active_keyid;
9311 #ifdef SCTP_AUDITING_ENABLED
9312         sctp_audit_log(0xC3, 1);
9313 #endif
9314         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9315             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9316                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9317                     asoc->sent_queue_retran_cnt);
9318                 asoc->sent_queue_cnt = 0;
9319                 asoc->sent_queue_cnt_removeable = 0;
9320                 /* send back 0/0 so we enter normal transmission */
9321                 *cnt_out = 0;
9322                 return (0);
9323         }
9324         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9325                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9326                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9327                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9328                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9329                                 continue;
9330                         }
9331                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9332                                 if (chk != asoc->str_reset) {
9333                                         /*
9334                                          * not eligible for retran if its
9335                                          * not ours
9336                                          */
9337                                         continue;
9338                                 }
9339                         }
9340                         ctl_cnt++;
9341                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9342                                 fwd_tsn = 1;
9343                         }
9344                         /*
9345                          * Add an AUTH chunk, if chunk requires it save the
9346                          * offset into the chain for AUTH
9347                          */
9348                         if ((auth == NULL) &&
9349                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9350                             stcb->asoc.peer_auth_chunks))) {
9351                                 m = sctp_add_auth_chunk(m, &endofchain,
9352                                     &auth, &auth_offset,
9353                                     stcb,
9354                                     chk->rec.chunk_id.id);
9355                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9356                         }
9357                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9358                         break;
9359                 }
9360         }
9361         one_chunk = 0;
9362         cnt_thru = 0;
9363         /* do we have control chunks to retransmit? */
9364         if (m != NULL) {
9365                 /* Start a timer no matter if we suceed or fail */
9366                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9367                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9368                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9369                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9370                 chk->snd_count++;       /* update our count */
9371                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9372                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9373                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9374                     no_fragmentflg, 0, 0,
9375                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9376                     chk->whoTo->port, NULL,
9377                     0, 0,
9378                     so_locked))) {
9379                         SCTP_STAT_INCR(sctps_lowlevelerr);
9380                         return (error);
9381                 }
9382                 endofchain = NULL;
9383                 auth = NULL;
9384                 auth_offset = 0;
9385                 /*
9386                  * We don't want to mark the net->sent time here since this
9387                  * we use this for HB and retrans cannot measure RTT
9388                  */
9389                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9390                 *cnt_out += 1;
9391                 chk->sent = SCTP_DATAGRAM_SENT;
9392                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9393                 if (fwd_tsn == 0) {
9394                         return (0);
9395                 } else {
9396                         /* Clean up the fwd-tsn list */
9397                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9398                         return (0);
9399                 }
9400         }
9401         /*
9402          * Ok, it is just data retransmission we need to do or that and a
9403          * fwd-tsn with it all.
9404          */
9405         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9406                 return (SCTP_RETRAN_DONE);
9407         }
9408         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9409             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9410                 /* not yet open, resend the cookie and that is it */
9411                 return (1);
9412         }
9413 #ifdef SCTP_AUDITING_ENABLED
9414         sctp_auditing(20, inp, stcb, NULL);
9415 #endif
9416         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9417         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9418                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9419                         /* No, not sent to this net or not ready for rtx */
9420                         continue;
9421                 }
9422                 if (chk->data == NULL) {
9423                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9424                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9425                         continue;
9426                 }
9427                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9428                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9429                         /* Gak, we have exceeded max unlucky retran, abort! */
9430                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9431                             chk->snd_count,
9432                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9433                         atomic_add_int(&stcb->asoc.refcnt, 1);
9434                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9435                         SCTP_TCB_LOCK(stcb);
9436                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9437                         return (SCTP_RETRAN_EXIT);
9438                 }
9439                 /* pick up the net */
9440                 net = chk->whoTo;
9441                 switch (net->ro._l_addr.sa.sa_family) {
9442 #ifdef INET
9443                 case AF_INET:
9444                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9445                         break;
9446 #endif
9447 #ifdef INET6
9448                 case AF_INET6:
9449                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9450                         break;
9451 #endif
9452                 default:
9453                         /* TSNH */
9454                         mtu = net->mtu;
9455                         break;
9456                 }
9457
9458                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9459                         /* No room in peers rwnd */
9460                         uint32_t tsn;
9461
9462                         tsn = asoc->last_acked_seq + 1;
9463                         if (tsn == chk->rec.data.TSN_seq) {
9464                                 /*
9465                                  * we make a special exception for this
9466                                  * case. The peer has no rwnd but is missing
9467                                  * the lowest chunk.. which is probably what
9468                                  * is holding up the rwnd.
9469                                  */
9470                                 goto one_chunk_around;
9471                         }
9472                         return (1);
9473                 }
9474 one_chunk_around:
9475                 if (asoc->peers_rwnd < mtu) {
9476                         one_chunk = 1;
9477                         if ((asoc->peers_rwnd == 0) &&
9478                             (asoc->total_flight == 0)) {
9479                                 chk->window_probe = 1;
9480                                 chk->whoTo->window_probe = 1;
9481                         }
9482                 }
9483 #ifdef SCTP_AUDITING_ENABLED
9484                 sctp_audit_log(0xC3, 2);
9485 #endif
9486                 bundle_at = 0;
9487                 m = NULL;
9488                 net->fast_retran_ip = 0;
9489                 if (chk->rec.data.doing_fast_retransmit == 0) {
9490                         /*
9491                          * if no FR in progress skip destination that have
9492                          * flight_size > cwnd.
9493                          */
9494                         if (net->flight_size >= net->cwnd) {
9495                                 continue;
9496                         }
9497                 } else {
9498                         /*
9499                          * Mark the destination net to have FR recovery
9500                          * limits put on it.
9501                          */
9502                         *fr_done = 1;
9503                         net->fast_retran_ip = 1;
9504                 }
9505
9506                 /*
9507                  * if no AUTH is yet included and this chunk requires it,
9508                  * make sure to account for it.  We don't apply the size
9509                  * until the AUTH chunk is actually added below in case
9510                  * there is no room for this chunk.
9511                  */
9512                 if (data_auth_reqd && (auth == NULL)) {
9513                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9514                 } else
9515                         dmtu = 0;
9516
9517                 if ((chk->send_size <= (mtu - dmtu)) ||
9518                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9519                         /* ok we will add this one */
9520                         if (data_auth_reqd) {
9521                                 if (auth == NULL) {
9522                                         m = sctp_add_auth_chunk(m,
9523                                             &endofchain,
9524                                             &auth,
9525                                             &auth_offset,
9526                                             stcb,
9527                                             SCTP_DATA);
9528                                         auth_keyid = chk->auth_keyid;
9529                                         override_ok = 0;
9530                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9531                                 } else if (override_ok) {
9532                                         auth_keyid = chk->auth_keyid;
9533                                         override_ok = 0;
9534                                 } else if (chk->auth_keyid != auth_keyid) {
9535                                         /* different keyid, so done bundling */
9536                                         break;
9537                                 }
9538                         }
9539                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9540                         if (m == NULL) {
9541                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9542                                 return (ENOMEM);
9543                         }
9544                         /* Do clear IP_DF ? */
9545                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9546                                 no_fragmentflg = 0;
9547                         }
9548                         /* upate our MTU size */
9549                         if (mtu > (chk->send_size + dmtu))
9550                                 mtu -= (chk->send_size + dmtu);
9551                         else
9552                                 mtu = 0;
9553                         data_list[bundle_at++] = chk;
9554                         if (one_chunk && (asoc->total_flight <= 0)) {
9555                                 SCTP_STAT_INCR(sctps_windowprobed);
9556                         }
9557                 }
9558                 if (one_chunk == 0) {
9559                         /*
9560                          * now are there anymore forward from chk to pick
9561                          * up?
9562                          */
9563                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9564                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9565                                         /* Nope, not for retran */
9566                                         continue;
9567                                 }
9568                                 if (fwd->whoTo != net) {
9569                                         /* Nope, not the net in question */
9570                                         continue;
9571                                 }
9572                                 if (data_auth_reqd && (auth == NULL)) {
9573                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9574                                 } else
9575                                         dmtu = 0;
9576                                 if (fwd->send_size <= (mtu - dmtu)) {
9577                                         if (data_auth_reqd) {
9578                                                 if (auth == NULL) {
9579                                                         m = sctp_add_auth_chunk(m,
9580                                                             &endofchain,
9581                                                             &auth,
9582                                                             &auth_offset,
9583                                                             stcb,
9584                                                             SCTP_DATA);
9585                                                         auth_keyid = fwd->auth_keyid;
9586                                                         override_ok = 0;
9587                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9588                                                 } else if (override_ok) {
9589                                                         auth_keyid = fwd->auth_keyid;
9590                                                         override_ok = 0;
9591                                                 } else if (fwd->auth_keyid != auth_keyid) {
9592                                                         /*
9593                                                          * different keyid,
9594                                                          * so done bundling
9595                                                          */
9596                                                         break;
9597                                                 }
9598                                         }
9599                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9600                                         if (m == NULL) {
9601                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9602                                                 return (ENOMEM);
9603                                         }
9604                                         /* Do clear IP_DF ? */
9605                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9606                                                 no_fragmentflg = 0;
9607                                         }
9608                                         /* upate our MTU size */
9609                                         if (mtu > (fwd->send_size + dmtu))
9610                                                 mtu -= (fwd->send_size + dmtu);
9611                                         else
9612                                                 mtu = 0;
9613                                         data_list[bundle_at++] = fwd;
9614                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9615                                                 break;
9616                                         }
9617                                 } else {
9618                                         /* can't fit so we are done */
9619                                         break;
9620                                 }
9621                         }
9622                 }
9623                 /* Is there something to send for this destination? */
9624                 if (m) {
9625                         /*
9626                          * No matter if we fail/or suceed we should start a
9627                          * timer. A failure is like a lost IP packet :-)
9628                          */
9629                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9630                                 /*
9631                                  * no timer running on this destination
9632                                  * restart it.
9633                                  */
9634                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9635                                 tmr_started = 1;
9636                         }
9637                         /* Now lets send it, if there is anything to send :> */
9638                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9639                             (struct sockaddr *)&net->ro._l_addr, m,
9640                             auth_offset, auth, auth_keyid,
9641                             no_fragmentflg, 0, 0,
9642                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9643                             net->port, NULL,
9644                             0, 0,
9645                             so_locked))) {
9646                                 /* error, we could not output */
9647                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9648                                 return (error);
9649                         }
9650                         endofchain = NULL;
9651                         auth = NULL;
9652                         auth_offset = 0;
9653                         /* For HB's */
9654                         /*
9655                          * We don't want to mark the net->sent time here
9656                          * since this we use this for HB and retrans cannot
9657                          * measure RTT
9658                          */
9659                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9660
9661                         /* For auto-close */
9662                         cnt_thru++;
9663                         if (*now_filled == 0) {
9664                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9665                                 *now = asoc->time_last_sent;
9666                                 *now_filled = 1;
9667                         } else {
9668                                 asoc->time_last_sent = *now;
9669                         }
9670                         *cnt_out += bundle_at;
9671 #ifdef SCTP_AUDITING_ENABLED
9672                         sctp_audit_log(0xC4, bundle_at);
9673 #endif
9674                         if (bundle_at) {
9675                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9676                         }
9677                         for (i = 0; i < bundle_at; i++) {
9678                                 SCTP_STAT_INCR(sctps_sendretransdata);
9679                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9680                                 /*
9681                                  * When we have a revoked data, and we
9682                                  * retransmit it, then we clear the revoked
9683                                  * flag since this flag dictates if we
9684                                  * subtracted from the fs
9685                                  */
9686                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9687                                         /* Deflate the cwnd */
9688                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9689                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9690                                 }
9691                                 data_list[i]->snd_count++;
9692                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9693                                 /* record the time */
9694                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9695                                 if (data_list[i]->book_size_scale) {
9696                                         /*
9697                                          * need to double the book size on
9698                                          * this one
9699                                          */
9700                                         data_list[i]->book_size_scale = 0;
9701                                         /*
9702                                          * Since we double the booksize, we
9703                                          * must also double the output queue
9704                                          * size, since this get shrunk when
9705                                          * we free by this amount.
9706                                          */
9707                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9708                                         data_list[i]->book_size *= 2;
9709
9710
9711                                 } else {
9712                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9713                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9714                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9715                                         }
9716                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9717                                             (uint32_t) (data_list[i]->send_size +
9718                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9719                                 }
9720                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9721                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9722                                             data_list[i]->whoTo->flight_size,
9723                                             data_list[i]->book_size,
9724                                             (uintptr_t) data_list[i]->whoTo,
9725                                             data_list[i]->rec.data.TSN_seq);
9726                                 }
9727                                 sctp_flight_size_increase(data_list[i]);
9728                                 sctp_total_flight_increase(stcb, data_list[i]);
9729                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9730                                         /* SWS sender side engages */
9731                                         asoc->peers_rwnd = 0;
9732                                 }
9733                                 if ((i == 0) &&
9734                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9735                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9736                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9737                                             (tmr_started == 0)) {
9738                                                 /*-
9739                                                  * ok we just fast-retrans'd
9740                                                  * the lowest TSN, i.e the
9741                                                  * first on the list. In
9742                                                  * this case we want to give
9743                                                  * some more time to get a
9744                                                  * SACK back without a
9745                                                  * t3-expiring.
9746                                                  */
9747                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9748                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9749                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9750                                         }
9751                                 }
9752                         }
9753                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9754                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9755                         }
9756 #ifdef SCTP_AUDITING_ENABLED
9757                         sctp_auditing(21, inp, stcb, NULL);
9758 #endif
9759                 } else {
9760                         /* None will fit */
9761                         return (1);
9762                 }
9763                 if (asoc->sent_queue_retran_cnt <= 0) {
9764                         /* all done we have no more to retran */
9765                         asoc->sent_queue_retran_cnt = 0;
9766                         break;
9767                 }
9768                 if (one_chunk) {
9769                         /* No more room in rwnd */
9770                         return (1);
9771                 }
9772                 /* stop the for loop here. we sent out a packet */
9773                 break;
9774         }
9775         return (0);
9776 }
9777
9778 static void
9779 sctp_timer_validation(struct sctp_inpcb *inp,
9780     struct sctp_tcb *stcb,
9781     struct sctp_association *asoc)
9782 {
9783         struct sctp_nets *net;
9784
9785         /* Validate that a timer is running somewhere */
9786         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9787                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9788                         /* Here is a timer */
9789                         return;
9790                 }
9791         }
9792         SCTP_TCB_LOCK_ASSERT(stcb);
9793         /* Gak, we did not have a timer somewhere */
9794         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9795         if (asoc->alternate) {
9796                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9797         } else {
9798                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9799         }
9800         return;
9801 }
9802
9803 void
9804 sctp_chunk_output(struct sctp_inpcb *inp,
9805     struct sctp_tcb *stcb,
9806     int from_where,
9807     int so_locked
9808 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9809     SCTP_UNUSED
9810 #endif
9811 )
9812 {
9813         /*-
9814          * Ok this is the generic chunk service queue. we must do the
9815          * following:
9816          * - See if there are retransmits pending, if so we must
9817          *   do these first.
9818          * - Service the stream queue that is next, moving any
9819          *   message (note I must get a complete message i.e.
9820          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9821          *   TSN's
9822          * - Check to see if the cwnd/rwnd allows any output, if so we
9823          *   go ahead and fomulate and send the low level chunks. Making sure
9824          *   to combine any control in the control chunk queue also.
9825          */
9826         struct sctp_association *asoc;
9827         struct sctp_nets *net;
9828         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9829         unsigned int burst_cnt = 0;
9830         struct timeval now;
9831         int now_filled = 0;
9832         int nagle_on;
9833         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9834         int un_sent = 0;
9835         int fr_done;
9836         unsigned int tot_frs = 0;
9837
9838         asoc = &stcb->asoc;
9839         /* The Nagle algorithm is only applied when handling a send call. */
9840         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9841                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9842                         nagle_on = 0;
9843                 } else {
9844                         nagle_on = 1;
9845                 }
9846         } else {
9847                 nagle_on = 0;
9848         }
9849         SCTP_TCB_LOCK_ASSERT(stcb);
9850
9851         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9852
9853         if ((un_sent <= 0) &&
9854             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9855             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9856             (asoc->sent_queue_retran_cnt == 0)) {
9857                 /* Nothing to do unless there is something to be sent left */
9858                 return;
9859         }
9860         /*
9861          * Do we have something to send, data or control AND a sack timer
9862          * running, if so piggy-back the sack.
9863          */
9864         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9865                 sctp_send_sack(stcb, so_locked);
9866                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9867         }
9868         while (asoc->sent_queue_retran_cnt) {
9869                 /*-
9870                  * Ok, it is retransmission time only, we send out only ONE
9871                  * packet with a single call off to the retran code.
9872                  */
9873                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9874                         /*-
9875                          * Special hook for handling cookiess discarded
9876                          * by peer that carried data. Send cookie-ack only
9877                          * and then the next call with get the retran's.
9878                          */
9879                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9880                             from_where,
9881                             &now, &now_filled, frag_point, so_locked);
9882                         return;
9883                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9884                         /* if its not from a HB then do it */
9885                         fr_done = 0;
9886                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9887                         if (fr_done) {
9888                                 tot_frs++;
9889                         }
9890                 } else {
9891                         /*
9892                          * its from any other place, we don't allow retran
9893                          * output (only control)
9894                          */
9895                         ret = 1;
9896                 }
9897                 if (ret > 0) {
9898                         /* Can't send anymore */
9899                         /*-
9900                          * now lets push out control by calling med-level
9901                          * output once. this assures that we WILL send HB's
9902                          * if queued too.
9903                          */
9904                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9905                             from_where,
9906                             &now, &now_filled, frag_point, so_locked);
9907 #ifdef SCTP_AUDITING_ENABLED
9908                         sctp_auditing(8, inp, stcb, NULL);
9909 #endif
9910                         sctp_timer_validation(inp, stcb, asoc);
9911                         return;
9912                 }
9913                 if (ret < 0) {
9914                         /*-
9915                          * The count was off.. retran is not happening so do
9916                          * the normal retransmission.
9917                          */
9918 #ifdef SCTP_AUDITING_ENABLED
9919                         sctp_auditing(9, inp, stcb, NULL);
9920 #endif
9921                         if (ret == SCTP_RETRAN_EXIT) {
9922                                 return;
9923                         }
9924                         break;
9925                 }
9926                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9927                         /* Only one transmission allowed out of a timeout */
9928 #ifdef SCTP_AUDITING_ENABLED
9929                         sctp_auditing(10, inp, stcb, NULL);
9930 #endif
9931                         /* Push out any control */
9932                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9933                             &now, &now_filled, frag_point, so_locked);
9934                         return;
9935                 }
9936                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9937                         /* Hit FR burst limit */
9938                         return;
9939                 }
9940                 if ((num_out == 0) && (ret == 0)) {
9941                         /* No more retrans to send */
9942                         break;
9943                 }
9944         }
9945 #ifdef SCTP_AUDITING_ENABLED
9946         sctp_auditing(12, inp, stcb, NULL);
9947 #endif
9948         /* Check for bad destinations, if they exist move chunks around. */
9949         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9950                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9951                         /*-
9952                          * if possible move things off of this address we
9953                          * still may send below due to the dormant state but
9954                          * we try to find an alternate address to send to
9955                          * and if we have one we move all queued data on the
9956                          * out wheel to this alternate address.
9957                          */
9958                         if (net->ref_count > 1)
9959                                 sctp_move_chunks_from_net(stcb, net);
9960                 } else {
9961                         /*-
9962                          * if ((asoc->sat_network) || (net->addr_is_local))
9963                          * { burst_limit = asoc->max_burst *
9964                          * SCTP_SAT_NETWORK_BURST_INCR; }
9965                          */
9966                         if (asoc->max_burst > 0) {
9967                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9968                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9969                                                 /*
9970                                                  * JRS - Use the congestion
9971                                                  * control given in the
9972                                                  * congestion control module
9973                                                  */
9974                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9975                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9976                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9977                                                 }
9978                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9979                                         }
9980                                         net->fast_retran_ip = 0;
9981                                 } else {
9982                                         if (net->flight_size == 0) {
9983                                                 /*
9984                                                  * Should be decaying the
9985                                                  * cwnd here
9986                                                  */
9987                                                 ;
9988                                         }
9989                                 }
9990                         }
9991                 }
9992
9993         }
9994         burst_cnt = 0;
9995         do {
9996                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9997                     &reason_code, 0, from_where,
9998                     &now, &now_filled, frag_point, so_locked);
9999                 if (error) {
10000                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10001                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10002                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10003                         }
10004                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10005                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10006                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10007                         }
10008                         break;
10009                 }
10010                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10011
10012                 tot_out += num_out;
10013                 burst_cnt++;
10014                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10015                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10016                         if (num_out == 0) {
10017                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10018                         }
10019                 }
10020                 if (nagle_on) {
10021                         /*
10022                          * When the Nagle algorithm is used, look at how
10023                          * much is unsent, then if its smaller than an MTU
10024                          * and we have data in flight we stop, except if we
10025                          * are handling a fragmented user message.
10026                          */
10027                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10028                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10029                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10030                             (stcb->asoc.total_flight > 0) &&
10031                             ((stcb->asoc.locked_on_sending == NULL) ||
10032                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10033                                 break;
10034                         }
10035                 }
10036                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10037                     TAILQ_EMPTY(&asoc->send_queue) &&
10038                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10039                         /* Nothing left to send */
10040                         break;
10041                 }
10042                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10043                         /* Nothing left to send */
10044                         break;
10045                 }
10046         } while (num_out &&
10047             ((asoc->max_burst == 0) ||
10048             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10049             (burst_cnt < asoc->max_burst)));
10050
10051         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10052                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10053                         SCTP_STAT_INCR(sctps_maxburstqueued);
10054                         asoc->burst_limit_applied = 1;
10055                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10056                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10057                         }
10058                 } else {
10059                         asoc->burst_limit_applied = 0;
10060                 }
10061         }
10062         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10063                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10064         }
10065         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10066             tot_out);
10067
10068         /*-
10069          * Now we need to clean up the control chunk chain if a ECNE is on
10070          * it. It must be marked as UNSENT again so next call will continue
10071          * to send it until such time that we get a CWR, to remove it.
10072          */
10073         if (stcb->asoc.ecn_echo_cnt_onq)
10074                 sctp_fix_ecn_echo(asoc);
10075         return;
10076 }
10077
10078
10079 int
10080 sctp_output(
10081     struct sctp_inpcb *inp,
10082     struct mbuf *m,
10083     struct sockaddr *addr,
10084     struct mbuf *control,
10085     struct thread *p,
10086     int flags)
10087 {
10088         if (inp == NULL) {
10089                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10090                 return (EINVAL);
10091         }
10092         if (inp->sctp_socket == NULL) {
10093                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10094                 return (EINVAL);
10095         }
10096         return (sctp_sosend(inp->sctp_socket,
10097             addr,
10098             (struct uio *)NULL,
10099             m,
10100             control,
10101             flags, p
10102             ));
10103 }
10104
10105 void
10106 send_forward_tsn(struct sctp_tcb *stcb,
10107     struct sctp_association *asoc)
10108 {
10109         struct sctp_tmit_chunk *chk;
10110         struct sctp_forward_tsn_chunk *fwdtsn;
10111         uint32_t advance_peer_ack_point;
10112
10113         SCTP_TCB_LOCK_ASSERT(stcb);
10114         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10115                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10116                         /* mark it to unsent */
10117                         chk->sent = SCTP_DATAGRAM_UNSENT;
10118                         chk->snd_count = 0;
10119                         /* Do we correct its output location? */
10120                         if (chk->whoTo) {
10121                                 sctp_free_remote_addr(chk->whoTo);
10122                                 chk->whoTo = NULL;
10123                         }
10124                         goto sctp_fill_in_rest;
10125                 }
10126         }
10127         /* Ok if we reach here we must build one */
10128         sctp_alloc_a_chunk(stcb, chk);
10129         if (chk == NULL) {
10130                 return;
10131         }
10132         asoc->fwd_tsn_cnt++;
10133         chk->copy_by_ref = 0;
10134         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10135         chk->rec.chunk_id.can_take_data = 0;
10136         chk->asoc = asoc;
10137         chk->whoTo = NULL;
10138         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10139         if (chk->data == NULL) {
10140                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10141                 return;
10142         }
10143         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10144         chk->sent = SCTP_DATAGRAM_UNSENT;
10145         chk->snd_count = 0;
10146         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10147         asoc->ctrl_queue_cnt++;
10148 sctp_fill_in_rest:
10149         /*-
10150          * Here we go through and fill out the part that deals with
10151          * stream/seq of the ones we skip.
10152          */
10153         SCTP_BUF_LEN(chk->data) = 0;
10154         {
10155                 struct sctp_tmit_chunk *at, *tp1, *last;
10156                 struct sctp_strseq *strseq;
10157                 unsigned int cnt_of_space, i, ovh;
10158                 unsigned int space_needed;
10159                 unsigned int cnt_of_skipped = 0;
10160
10161                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10162                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10163                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10164                                 /* no more to look at */
10165                                 break;
10166                         }
10167                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10168                                 /* We don't report these */
10169                                 continue;
10170                         }
10171                         cnt_of_skipped++;
10172                 }
10173                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10174                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10175
10176                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10177
10178                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10179                         ovh = SCTP_MIN_OVERHEAD;
10180                 } else {
10181                         ovh = SCTP_MIN_V4_OVERHEAD;
10182                 }
10183                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10184                         /* trim to a mtu size */
10185                         cnt_of_space = asoc->smallest_mtu - ovh;
10186                 }
10187                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10188                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10189                             0xff, 0, cnt_of_skipped,
10190                             asoc->advanced_peer_ack_point);
10191
10192                 }
10193                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10194                 if (cnt_of_space < space_needed) {
10195                         /*-
10196                          * ok we must trim down the chunk by lowering the
10197                          * advance peer ack point.
10198                          */
10199                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10200                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10201                                     0xff, 0xff, cnt_of_space,
10202                                     space_needed);
10203                         }
10204                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10205                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10206                         /*-
10207                          * Go through and find the TSN that will be the one
10208                          * we report.
10209                          */
10210                         at = TAILQ_FIRST(&asoc->sent_queue);
10211                         if (at != NULL) {
10212                                 for (i = 0; i < cnt_of_skipped; i++) {
10213                                         tp1 = TAILQ_NEXT(at, sctp_next);
10214                                         if (tp1 == NULL) {
10215                                                 break;
10216                                         }
10217                                         at = tp1;
10218                                 }
10219                         }
10220                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10221                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10222                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10223                                     asoc->advanced_peer_ack_point);
10224                         }
10225                         last = at;
10226                         /*-
10227                          * last now points to last one I can report, update
10228                          * peer ack point
10229                          */
10230                         if (last)
10231                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10232                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10233                             cnt_of_skipped * sizeof(struct sctp_strseq);
10234                 }
10235                 chk->send_size = space_needed;
10236                 /* Setup the chunk */
10237                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10238                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10239                 fwdtsn->ch.chunk_flags = 0;
10240                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10241                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10242                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10243                 fwdtsn++;
10244                 /*-
10245                  * Move pointer to after the fwdtsn and transfer to the
10246                  * strseq pointer.
10247                  */
10248                 strseq = (struct sctp_strseq *)fwdtsn;
10249                 /*-
10250                  * Now populate the strseq list. This is done blindly
10251                  * without pulling out duplicate stream info. This is
10252                  * inefficent but won't harm the process since the peer will
10253                  * look at these in sequence and will thus release anything.
10254                  * It could mean we exceed the PMTU and chop off some that
10255                  * we could have included.. but this is unlikely (aka 1432/4
10256                  * would mean 300+ stream seq's would have to be reported in
10257                  * one FWD-TSN. With a bit of work we can later FIX this to
10258                  * optimize and pull out duplcates.. but it does add more
10259                  * overhead. So for now... not!
10260                  */
10261                 at = TAILQ_FIRST(&asoc->sent_queue);
10262                 for (i = 0; i < cnt_of_skipped; i++) {
10263                         tp1 = TAILQ_NEXT(at, sctp_next);
10264                         if (tp1 == NULL)
10265                                 break;
10266                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10267                                 /* We don't report these */
10268                                 i--;
10269                                 at = tp1;
10270                                 continue;
10271                         }
10272                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10273                                 at->rec.data.fwd_tsn_cnt = 0;
10274                         }
10275                         strseq->stream = ntohs(at->rec.data.stream_number);
10276                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10277                         strseq++;
10278                         at = tp1;
10279                 }
10280         }
10281         return;
10282 }
10283
10284 void
10285 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10286 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10287     SCTP_UNUSED
10288 #endif
10289 )
10290 {
10291         /*-
10292          * Queue up a SACK or NR-SACK in the control queue.
10293          * We must first check to see if a SACK or NR-SACK is
10294          * somehow on the control queue.
10295          * If so, we will take and and remove the old one.
10296          */
10297         struct sctp_association *asoc;
10298         struct sctp_tmit_chunk *chk, *a_chk;
10299         struct sctp_sack_chunk *sack;
10300         struct sctp_nr_sack_chunk *nr_sack;
10301         struct sctp_gap_ack_block *gap_descriptor;
10302         struct sack_track *selector;
10303         int mergeable = 0;
10304         int offset;
10305         caddr_t limit;
10306         uint32_t *dup;
10307         int limit_reached = 0;
10308         unsigned int i, siz, j;
10309         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10310         int num_dups = 0;
10311         int space_req;
10312         uint32_t highest_tsn;
10313         uint8_t flags;
10314         uint8_t type;
10315         uint8_t tsn_map;
10316
10317         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10318             (stcb->asoc.peer_supports_nr_sack == 1)) {
10319                 type = SCTP_NR_SELECTIVE_ACK;
10320         } else {
10321                 type = SCTP_SELECTIVE_ACK;
10322         }
10323         a_chk = NULL;
10324         asoc = &stcb->asoc;
10325         SCTP_TCB_LOCK_ASSERT(stcb);
10326         if (asoc->last_data_chunk_from == NULL) {
10327                 /* Hmm we never received anything */
10328                 return;
10329         }
10330         sctp_slide_mapping_arrays(stcb);
10331         sctp_set_rwnd(stcb, asoc);
10332         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10333                 if (chk->rec.chunk_id.id == type) {
10334                         /* Hmm, found a sack already on queue, remove it */
10335                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10336                         asoc->ctrl_queue_cnt--;
10337                         a_chk = chk;
10338                         if (a_chk->data) {
10339                                 sctp_m_freem(a_chk->data);
10340                                 a_chk->data = NULL;
10341                         }
10342                         if (a_chk->whoTo) {
10343                                 sctp_free_remote_addr(a_chk->whoTo);
10344                                 a_chk->whoTo = NULL;
10345                         }
10346                         break;
10347                 }
10348         }
10349         if (a_chk == NULL) {
10350                 sctp_alloc_a_chunk(stcb, a_chk);
10351                 if (a_chk == NULL) {
10352                         /* No memory so we drop the idea, and set a timer */
10353                         if (stcb->asoc.delayed_ack) {
10354                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10355                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10356                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10357                                     stcb->sctp_ep, stcb, NULL);
10358                         } else {
10359                                 stcb->asoc.send_sack = 1;
10360                         }
10361                         return;
10362                 }
10363                 a_chk->copy_by_ref = 0;
10364                 a_chk->rec.chunk_id.id = type;
10365                 a_chk->rec.chunk_id.can_take_data = 1;
10366         }
10367         /* Clear our pkt counts */
10368         asoc->data_pkts_seen = 0;
10369
10370         a_chk->asoc = asoc;
10371         a_chk->snd_count = 0;
10372         a_chk->send_size = 0;   /* fill in later */
10373         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10374         a_chk->whoTo = NULL;
10375
10376         if ((asoc->numduptsns) ||
10377             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10378                 /*-
10379                  * Ok, we have some duplicates or the destination for the
10380                  * sack is unreachable, lets see if we can select an
10381                  * alternate than asoc->last_data_chunk_from
10382                  */
10383                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10384                     (asoc->used_alt_onsack > asoc->numnets)) {
10385                         /* We used an alt last time, don't this time */
10386                         a_chk->whoTo = NULL;
10387                 } else {
10388                         asoc->used_alt_onsack++;
10389                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10390                 }
10391                 if (a_chk->whoTo == NULL) {
10392                         /* Nope, no alternate */
10393                         a_chk->whoTo = asoc->last_data_chunk_from;
10394                         asoc->used_alt_onsack = 0;
10395                 }
10396         } else {
10397                 /*
10398                  * No duplicates so we use the last place we received data
10399                  * from.
10400                  */
10401                 asoc->used_alt_onsack = 0;
10402                 a_chk->whoTo = asoc->last_data_chunk_from;
10403         }
10404         if (a_chk->whoTo) {
10405                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10406         }
10407         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10408                 highest_tsn = asoc->highest_tsn_inside_map;
10409         } else {
10410                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10411         }
10412         if (highest_tsn == asoc->cumulative_tsn) {
10413                 /* no gaps */
10414                 if (type == SCTP_SELECTIVE_ACK) {
10415                         space_req = sizeof(struct sctp_sack_chunk);
10416                 } else {
10417                         space_req = sizeof(struct sctp_nr_sack_chunk);
10418                 }
10419         } else {
10420                 /* gaps get a cluster */
10421                 space_req = MCLBYTES;
10422         }
10423         /* Ok now lets formulate a MBUF with our sack */
10424         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10425         if ((a_chk->data == NULL) ||
10426             (a_chk->whoTo == NULL)) {
10427                 /* rats, no mbuf memory */
10428                 if (a_chk->data) {
10429                         /* was a problem with the destination */
10430                         sctp_m_freem(a_chk->data);
10431                         a_chk->data = NULL;
10432                 }
10433                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10434                 /* sa_ignore NO_NULL_CHK */
10435                 if (stcb->asoc.delayed_ack) {
10436                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10437                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10438                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10439                             stcb->sctp_ep, stcb, NULL);
10440                 } else {
10441                         stcb->asoc.send_sack = 1;
10442                 }
10443                 return;
10444         }
10445         /* ok, lets go through and fill it in */
10446         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10447         space = M_TRAILINGSPACE(a_chk->data);
10448         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10449                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10450         }
10451         limit = mtod(a_chk->data, caddr_t);
10452         limit += space;
10453
10454         flags = 0;
10455
10456         if ((asoc->sctp_cmt_on_off > 0) &&
10457             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10458                 /*-
10459                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10460                  * received, then set high bit to 1, else 0. Reset
10461                  * pkts_rcvd.
10462                  */
10463                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10464                 asoc->cmt_dac_pkts_rcvd = 0;
10465         }
10466 #ifdef SCTP_ASOCLOG_OF_TSNS
10467         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10468         stcb->asoc.cumack_log_atsnt++;
10469         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10470                 stcb->asoc.cumack_log_atsnt = 0;
10471         }
10472 #endif
10473         /* reset the readers interpretation */
10474         stcb->freed_by_sorcv_sincelast = 0;
10475
10476         if (type == SCTP_SELECTIVE_ACK) {
10477                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10478                 nr_sack = NULL;
10479                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10480                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10481                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10482                 } else {
10483                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10484                 }
10485         } else {
10486                 sack = NULL;
10487                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10488                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10489                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10490                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10491                 } else {
10492                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10493                 }
10494         }
10495
10496         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10497                 offset = 1;
10498         } else {
10499                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10500         }
10501         if (((type == SCTP_SELECTIVE_ACK) &&
10502             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10503             ((type == SCTP_NR_SELECTIVE_ACK) &&
10504             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10505                 /* we have a gap .. maybe */
10506                 for (i = 0; i < siz; i++) {
10507                         tsn_map = asoc->mapping_array[i];
10508                         if (type == SCTP_SELECTIVE_ACK) {
10509                                 tsn_map |= asoc->nr_mapping_array[i];
10510                         }
10511                         if (i == 0) {
10512                                 /*
10513                                  * Clear all bits corresponding to TSNs
10514                                  * smaller or equal to the cumulative TSN.
10515                                  */
10516                                 tsn_map &= (~0 << (1 - offset));
10517                         }
10518                         selector = &sack_array[tsn_map];
10519                         if (mergeable && selector->right_edge) {
10520                                 /*
10521                                  * Backup, left and right edges were ok to
10522                                  * merge.
10523                                  */
10524                                 num_gap_blocks--;
10525                                 gap_descriptor--;
10526                         }
10527                         if (selector->num_entries == 0)
10528                                 mergeable = 0;
10529                         else {
10530                                 for (j = 0; j < selector->num_entries; j++) {
10531                                         if (mergeable && selector->right_edge) {
10532                                                 /*
10533                                                  * do a merge by NOT setting
10534                                                  * the left side
10535                                                  */
10536                                                 mergeable = 0;
10537                                         } else {
10538                                                 /*
10539                                                  * no merge, set the left
10540                                                  * side
10541                                                  */
10542                                                 mergeable = 0;
10543                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10544                                         }
10545                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10546                                         num_gap_blocks++;
10547                                         gap_descriptor++;
10548                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10549                                                 /* no more room */
10550                                                 limit_reached = 1;
10551                                                 break;
10552                                         }
10553                                 }
10554                                 if (selector->left_edge) {
10555                                         mergeable = 1;
10556                                 }
10557                         }
10558                         if (limit_reached) {
10559                                 /* Reached the limit stop */
10560                                 break;
10561                         }
10562                         offset += 8;
10563                 }
10564         }
10565         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10566             (limit_reached == 0)) {
10567
10568                 mergeable = 0;
10569
10570                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10571                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10572                 } else {
10573                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10574                 }
10575
10576                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10577                         offset = 1;
10578                 } else {
10579                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10580                 }
10581                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10582                         /* we have a gap .. maybe */
10583                         for (i = 0; i < siz; i++) {
10584                                 tsn_map = asoc->nr_mapping_array[i];
10585                                 if (i == 0) {
10586                                         /*
10587                                          * Clear all bits corresponding to
10588                                          * TSNs smaller or equal to the
10589                                          * cumulative TSN.
10590                                          */
10591                                         tsn_map &= (~0 << (1 - offset));
10592                                 }
10593                                 selector = &sack_array[tsn_map];
10594                                 if (mergeable && selector->right_edge) {
10595                                         /*
10596                                          * Backup, left and right edges were
10597                                          * ok to merge.
10598                                          */
10599                                         num_nr_gap_blocks--;
10600                                         gap_descriptor--;
10601                                 }
10602                                 if (selector->num_entries == 0)
10603                                         mergeable = 0;
10604                                 else {
10605                                         for (j = 0; j < selector->num_entries; j++) {
10606                                                 if (mergeable && selector->right_edge) {
10607                                                         /*
10608                                                          * do a merge by NOT
10609                                                          * setting the left
10610                                                          * side
10611                                                          */
10612                                                         mergeable = 0;
10613                                                 } else {
10614                                                         /*
10615                                                          * no merge, set the
10616                                                          * left side
10617                                                          */
10618                                                         mergeable = 0;
10619                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10620                                                 }
10621                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10622                                                 num_nr_gap_blocks++;
10623                                                 gap_descriptor++;
10624                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10625                                                         /* no more room */
10626                                                         limit_reached = 1;
10627                                                         break;
10628                                                 }
10629                                         }
10630                                         if (selector->left_edge) {
10631                                                 mergeable = 1;
10632                                         }
10633                                 }
10634                                 if (limit_reached) {
10635                                         /* Reached the limit stop */
10636                                         break;
10637                                 }
10638                                 offset += 8;
10639                         }
10640                 }
10641         }
10642         /* now we must add any dups we are going to report. */
10643         if ((limit_reached == 0) && (asoc->numduptsns)) {
10644                 dup = (uint32_t *) gap_descriptor;
10645                 for (i = 0; i < asoc->numduptsns; i++) {
10646                         *dup = htonl(asoc->dup_tsns[i]);
10647                         dup++;
10648                         num_dups++;
10649                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10650                                 /* no more room */
10651                                 break;
10652                         }
10653                 }
10654                 asoc->numduptsns = 0;
10655         }
10656         /*
10657          * now that the chunk is prepared queue it to the control chunk
10658          * queue.
10659          */
10660         if (type == SCTP_SELECTIVE_ACK) {
10661                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10662                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10663                     num_dups * sizeof(int32_t);
10664                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10665                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10666                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10667                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10668                 sack->sack.num_dup_tsns = htons(num_dups);
10669                 sack->ch.chunk_type = type;
10670                 sack->ch.chunk_flags = flags;
10671                 sack->ch.chunk_length = htons(a_chk->send_size);
10672         } else {
10673                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10674                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10675                     num_dups * sizeof(int32_t);
10676                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10677                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10678                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10679                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10680                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10681                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10682                 nr_sack->nr_sack.reserved = 0;
10683                 nr_sack->ch.chunk_type = type;
10684                 nr_sack->ch.chunk_flags = flags;
10685                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10686         }
10687         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10688         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10689         asoc->ctrl_queue_cnt++;
10690         asoc->send_sack = 0;
10691         SCTP_STAT_INCR(sctps_sendsacks);
10692         return;
10693 }
10694
10695 void
10696 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10697 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10698     SCTP_UNUSED
10699 #endif
10700 )
10701 {
10702         struct mbuf *m_abort;
10703         struct mbuf *m_out = NULL, *m_end = NULL;
10704         struct sctp_abort_chunk *abort = NULL;
10705         int sz;
10706         uint32_t auth_offset = 0;
10707         struct sctp_auth_chunk *auth = NULL;
10708         struct sctp_nets *net;
10709
10710         /*-
10711          * Add an AUTH chunk, if chunk requires it and save the offset into
10712          * the chain for AUTH
10713          */
10714         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10715             stcb->asoc.peer_auth_chunks)) {
10716                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10717                     stcb, SCTP_ABORT_ASSOCIATION);
10718                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10719         }
10720         SCTP_TCB_LOCK_ASSERT(stcb);
10721         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10722         if (m_abort == NULL) {
10723                 /* no mbuf's */
10724                 if (m_out)
10725                         sctp_m_freem(m_out);
10726                 return;
10727         }
10728         /* link in any error */
10729         SCTP_BUF_NEXT(m_abort) = operr;
10730         sz = 0;
10731         if (operr) {
10732                 struct mbuf *n;
10733
10734                 n = operr;
10735                 while (n) {
10736                         sz += SCTP_BUF_LEN(n);
10737                         n = SCTP_BUF_NEXT(n);
10738                 }
10739         }
10740         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10741         if (m_out == NULL) {
10742                 /* NO Auth chunk prepended, so reserve space in front */
10743                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10744                 m_out = m_abort;
10745         } else {
10746                 /* Put AUTH chunk at the front of the chain */
10747                 SCTP_BUF_NEXT(m_end) = m_abort;
10748         }
10749         if (stcb->asoc.alternate) {
10750                 net = stcb->asoc.alternate;
10751         } else {
10752                 net = stcb->asoc.primary_destination;
10753         }
10754         /* fill in the ABORT chunk */
10755         abort = mtod(m_abort, struct sctp_abort_chunk *);
10756         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10757         abort->ch.chunk_flags = 0;
10758         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10759
10760         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10761             (struct sockaddr *)&net->ro._l_addr,
10762             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10763             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10764             stcb->asoc.primary_destination->port, NULL,
10765             0, 0,
10766             so_locked);
10767         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10768 }
10769
10770 void
10771 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10772     struct sctp_nets *net,
10773     int reflect_vtag)
10774 {
10775         /* formulate and SEND a SHUTDOWN-COMPLETE */
10776         struct mbuf *m_shutdown_comp;
10777         struct sctp_shutdown_complete_chunk *shutdown_complete;
10778         uint32_t vtag;
10779         uint8_t flags;
10780
10781         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10782         if (m_shutdown_comp == NULL) {
10783                 /* no mbuf's */
10784                 return;
10785         }
10786         if (reflect_vtag) {
10787                 flags = SCTP_HAD_NO_TCB;
10788                 vtag = stcb->asoc.my_vtag;
10789         } else {
10790                 flags = 0;
10791                 vtag = stcb->asoc.peer_vtag;
10792         }
10793         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10794         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10795         shutdown_complete->ch.chunk_flags = flags;
10796         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10797         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10798         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10799             (struct sockaddr *)&net->ro._l_addr,
10800             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10801             stcb->sctp_ep->sctp_lport, stcb->rport,
10802             htonl(vtag),
10803             net->port, NULL,
10804             0, 0,
10805             SCTP_SO_NOT_LOCKED);
10806         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10807         return;
10808 }
10809
10810 static void
10811 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10812     struct sctphdr *sh, uint32_t vtag,
10813     uint8_t type, struct mbuf *cause,
10814     uint8_t use_mflowid, uint32_t mflowid,
10815     uint32_t vrf_id, uint16_t port)
10816 {
10817         struct mbuf *o_pak;
10818         struct mbuf *mout;
10819         struct sctphdr *shout;
10820         struct sctp_chunkhdr *ch;
10821         struct udphdr *udp;
10822         int len, cause_len, padding_len, ret;
10823
10824 #ifdef INET
10825         struct sockaddr_in *src_sin, *dst_sin;
10826         struct ip *ip;
10827
10828 #endif
10829 #ifdef INET6
10830         struct sockaddr_in6 *src_sin6, *dst_sin6;
10831         struct ip6_hdr *ip6;
10832
10833 #endif
10834
10835         /* Compute the length of the cause and add final padding. */
10836         cause_len = 0;
10837         if (cause != NULL) {
10838                 struct mbuf *m_at, *m_last = NULL;
10839
10840                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10841                         if (SCTP_BUF_NEXT(m_at) == NULL)
10842                                 m_last = m_at;
10843                         cause_len += SCTP_BUF_LEN(m_at);
10844                 }
10845                 padding_len = cause_len % 4;
10846                 if (padding_len != 0) {
10847                         padding_len = 4 - padding_len;
10848                 }
10849                 if (padding_len != 0) {
10850                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10851                                 sctp_m_freem(cause);
10852                                 return;
10853                         }
10854                 }
10855         } else {
10856                 padding_len = 0;
10857         }
10858         /* Get an mbuf for the header. */
10859         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10860         switch (dst->sa_family) {
10861 #ifdef INET
10862         case AF_INET:
10863                 len += sizeof(struct ip);
10864                 break;
10865 #endif
10866 #ifdef INET6
10867         case AF_INET6:
10868                 len += sizeof(struct ip6_hdr);
10869                 break;
10870 #endif
10871         default:
10872                 break;
10873         }
10874         if (port) {
10875                 len += sizeof(struct udphdr);
10876         }
10877         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10878         if (mout == NULL) {
10879                 if (cause) {
10880                         sctp_m_freem(cause);
10881                 }
10882                 return;
10883         }
10884         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10885         SCTP_BUF_LEN(mout) = len;
10886         SCTP_BUF_NEXT(mout) = cause;
10887         if (use_mflowid != 0) {
10888                 mout->m_pkthdr.flowid = mflowid;
10889                 mout->m_flags |= M_FLOWID;
10890         }
10891 #ifdef INET
10892         ip = NULL;
10893 #endif
10894 #ifdef INET6
10895         ip6 = NULL;
10896 #endif
10897         switch (dst->sa_family) {
10898 #ifdef INET
10899         case AF_INET:
10900                 src_sin = (struct sockaddr_in *)src;
10901                 dst_sin = (struct sockaddr_in *)dst;
10902                 ip = mtod(mout, struct ip *);
10903                 ip->ip_v = IPVERSION;
10904                 ip->ip_hl = (sizeof(struct ip) >> 2);
10905                 ip->ip_tos = 0;
10906                 ip->ip_id = ip_newid();
10907                 ip->ip_off = 0;
10908                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10909                 if (port) {
10910                         ip->ip_p = IPPROTO_UDP;
10911                 } else {
10912                         ip->ip_p = IPPROTO_SCTP;
10913                 }
10914                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10915                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10916                 ip->ip_sum = 0;
10917                 len = sizeof(struct ip);
10918                 shout = (struct sctphdr *)((caddr_t)ip + len);
10919                 break;
10920 #endif
10921 #ifdef INET6
10922         case AF_INET6:
10923                 src_sin6 = (struct sockaddr_in6 *)src;
10924                 dst_sin6 = (struct sockaddr_in6 *)dst;
10925                 ip6 = mtod(mout, struct ip6_hdr *);
10926                 ip6->ip6_flow = htonl(0x60000000);
10927                 if (V_ip6_auto_flowlabel) {
10928                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10929                 }
10930                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10931                 if (port) {
10932                         ip6->ip6_nxt = IPPROTO_UDP;
10933                 } else {
10934                         ip6->ip6_nxt = IPPROTO_SCTP;
10935                 }
10936                 ip6->ip6_src = dst_sin6->sin6_addr;
10937                 ip6->ip6_dst = src_sin6->sin6_addr;
10938                 len = sizeof(struct ip6_hdr);
10939                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
10940                 break;
10941 #endif
10942         default:
10943                 len = 0;
10944                 shout = mtod(mout, struct sctphdr *);
10945                 break;
10946         }
10947         if (port) {
10948                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10949                         sctp_m_freem(mout);
10950                         return;
10951                 }
10952                 udp = (struct udphdr *)shout;
10953                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10954                 udp->uh_dport = port;
10955                 udp->uh_sum = 0;
10956                 udp->uh_ulen = htons(sizeof(struct udphdr) +
10957                     sizeof(struct sctphdr) +
10958                     sizeof(struct sctp_chunkhdr) +
10959                     cause_len + padding_len);
10960                 len += sizeof(struct udphdr);
10961                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
10962         } else {
10963                 udp = NULL;
10964         }
10965         shout->src_port = sh->dest_port;
10966         shout->dest_port = sh->src_port;
10967         shout->checksum = 0;
10968         if (vtag) {
10969                 shout->v_tag = htonl(vtag);
10970         } else {
10971                 shout->v_tag = sh->v_tag;
10972         }
10973         len += sizeof(struct sctphdr);
10974         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
10975         ch->chunk_type = type;
10976         if (vtag) {
10977                 ch->chunk_flags = 0;
10978         } else {
10979                 ch->chunk_flags = SCTP_HAD_NO_TCB;
10980         }
10981         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
10982         len += sizeof(struct sctp_chunkhdr);
10983         len += cause_len + padding_len;
10984
10985         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10986                 sctp_m_freem(mout);
10987                 return;
10988         }
10989         SCTP_ATTACH_CHAIN(o_pak, mout, len);
10990         switch (dst->sa_family) {
10991 #ifdef INET
10992         case AF_INET:
10993                 if (port) {
10994                         if (V_udp_cksum) {
10995                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10996                         } else {
10997                                 udp->uh_sum = 0;
10998                         }
10999                 }
11000                 ip->ip_len = len;
11001                 if (port) {
11002 #if defined(SCTP_WITH_NO_CSUM)
11003                         SCTP_STAT_INCR(sctps_sendnocrc);
11004 #else
11005                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11006                         SCTP_STAT_INCR(sctps_sendswcrc);
11007 #endif
11008                         if (V_udp_cksum) {
11009                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11010                         }
11011                 } else {
11012 #if defined(SCTP_WITH_NO_CSUM)
11013                         SCTP_STAT_INCR(sctps_sendnocrc);
11014 #else
11015                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11016                         mout->m_pkthdr.csum_data = 0;
11017                         SCTP_STAT_INCR(sctps_sendhwcrc);
11018 #endif
11019                 }
11020 #ifdef SCTP_PACKET_LOGGING
11021                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11022                         sctp_packet_log(o_pak);
11023                 }
11024 #endif
11025                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11026                 break;
11027 #endif
11028 #ifdef INET6
11029         case AF_INET6:
11030                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11031                 if (port) {
11032 #if defined(SCTP_WITH_NO_CSUM)
11033                         SCTP_STAT_INCR(sctps_sendnocrc);
11034 #else
11035                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11036                         SCTP_STAT_INCR(sctps_sendswcrc);
11037 #endif
11038                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11039                                 udp->uh_sum = 0xffff;
11040                         }
11041                 } else {
11042 #if defined(SCTP_WITH_NO_CSUM)
11043                         SCTP_STAT_INCR(sctps_sendnocrc);
11044 #else
11045                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11046                         mout->m_pkthdr.csum_data = 0;
11047                         SCTP_STAT_INCR(sctps_sendhwcrc);
11048 #endif
11049                 }
11050 #ifdef SCTP_PACKET_LOGGING
11051                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11052                         sctp_packet_log(o_pak);
11053                 }
11054 #endif
11055                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11056                 break;
11057 #endif
11058         default:
11059                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11060                     dst->sa_family);
11061                 sctp_m_freem(mout);
11062                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11063                 return;
11064         }
11065         SCTP_STAT_INCR(sctps_sendpackets);
11066         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11067         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11068         return;
11069 }
11070
11071 void
11072 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11073     struct sctphdr *sh,
11074     uint8_t use_mflowid, uint32_t mflowid,
11075     uint32_t vrf_id, uint16_t port)
11076 {
11077         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11078             use_mflowid, mflowid,
11079             vrf_id, port);
11080 }
11081
11082 void
11083 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11084 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11085     SCTP_UNUSED
11086 #endif
11087 )
11088 {
11089         struct sctp_tmit_chunk *chk;
11090         struct sctp_heartbeat_chunk *hb;
11091         struct timeval now;
11092
11093         SCTP_TCB_LOCK_ASSERT(stcb);
11094         if (net == NULL) {
11095                 return;
11096         }
11097         (void)SCTP_GETTIME_TIMEVAL(&now);
11098         switch (net->ro._l_addr.sa.sa_family) {
11099 #ifdef INET
11100         case AF_INET:
11101                 break;
11102 #endif
11103 #ifdef INET6
11104         case AF_INET6:
11105                 break;
11106 #endif
11107         default:
11108                 return;
11109         }
11110         sctp_alloc_a_chunk(stcb, chk);
11111         if (chk == NULL) {
11112                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11113                 return;
11114         }
11115         chk->copy_by_ref = 0;
11116         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11117         chk->rec.chunk_id.can_take_data = 1;
11118         chk->asoc = &stcb->asoc;
11119         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11120
11121         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11122         if (chk->data == NULL) {
11123                 sctp_free_a_chunk(stcb, chk, so_locked);
11124                 return;
11125         }
11126         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11127         SCTP_BUF_LEN(chk->data) = chk->send_size;
11128         chk->sent = SCTP_DATAGRAM_UNSENT;
11129         chk->snd_count = 0;
11130         chk->whoTo = net;
11131         atomic_add_int(&chk->whoTo->ref_count, 1);
11132         /* Now we have a mbuf that we can fill in with the details */
11133         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11134         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11135         /* fill out chunk header */
11136         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11137         hb->ch.chunk_flags = 0;
11138         hb->ch.chunk_length = htons(chk->send_size);
11139         /* Fill out hb parameter */
11140         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11141         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11142         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11143         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11144         /* Did our user request this one, put it in */
11145         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11146         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11147         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11148                 /*
11149                  * we only take from the entropy pool if the address is not
11150                  * confirmed.
11151                  */
11152                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11153                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11154         } else {
11155                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11156                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11157         }
11158         switch (net->ro._l_addr.sa.sa_family) {
11159 #ifdef INET
11160         case AF_INET:
11161                 memcpy(hb->heartbeat.hb_info.address,
11162                     &net->ro._l_addr.sin.sin_addr,
11163                     sizeof(net->ro._l_addr.sin.sin_addr));
11164                 break;
11165 #endif
11166 #ifdef INET6
11167         case AF_INET6:
11168                 memcpy(hb->heartbeat.hb_info.address,
11169                     &net->ro._l_addr.sin6.sin6_addr,
11170                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11171                 break;
11172 #endif
11173         default:
11174                 return;
11175                 break;
11176         }
11177         net->hb_responded = 0;
11178         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11179         stcb->asoc.ctrl_queue_cnt++;
11180         SCTP_STAT_INCR(sctps_sendheartbeat);
11181         return;
11182 }
11183
11184 void
11185 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11186     uint32_t high_tsn)
11187 {
11188         struct sctp_association *asoc;
11189         struct sctp_ecne_chunk *ecne;
11190         struct sctp_tmit_chunk *chk;
11191
11192         if (net == NULL) {
11193                 return;
11194         }
11195         asoc = &stcb->asoc;
11196         SCTP_TCB_LOCK_ASSERT(stcb);
11197         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11198                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11199                         /* found a previous ECN_ECHO update it if needed */
11200                         uint32_t cnt, ctsn;
11201
11202                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11203                         ctsn = ntohl(ecne->tsn);
11204                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11205                                 ecne->tsn = htonl(high_tsn);
11206                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11207                         }
11208                         cnt = ntohl(ecne->num_pkts_since_cwr);
11209                         cnt++;
11210                         ecne->num_pkts_since_cwr = htonl(cnt);
11211                         return;
11212                 }
11213         }
11214         /* nope could not find one to update so we must build one */
11215         sctp_alloc_a_chunk(stcb, chk);
11216         if (chk == NULL) {
11217                 return;
11218         }
11219         chk->copy_by_ref = 0;
11220         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11221         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11222         chk->rec.chunk_id.can_take_data = 0;
11223         chk->asoc = &stcb->asoc;
11224         chk->send_size = sizeof(struct sctp_ecne_chunk);
11225         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11226         if (chk->data == NULL) {
11227                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11228                 return;
11229         }
11230         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11231         SCTP_BUF_LEN(chk->data) = chk->send_size;
11232         chk->sent = SCTP_DATAGRAM_UNSENT;
11233         chk->snd_count = 0;
11234         chk->whoTo = net;
11235         atomic_add_int(&chk->whoTo->ref_count, 1);
11236
11237         stcb->asoc.ecn_echo_cnt_onq++;
11238         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11239         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11240         ecne->ch.chunk_flags = 0;
11241         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11242         ecne->tsn = htonl(high_tsn);
11243         ecne->num_pkts_since_cwr = htonl(1);
11244         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11245         asoc->ctrl_queue_cnt++;
11246 }
11247
11248 void
11249 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11250     struct mbuf *m, int len, int iphlen, int bad_crc)
11251 {
11252         struct sctp_association *asoc;
11253         struct sctp_pktdrop_chunk *drp;
11254         struct sctp_tmit_chunk *chk;
11255         uint8_t *datap;
11256         int was_trunc = 0;
11257         int fullsz = 0;
11258         long spc;
11259         int offset;
11260         struct sctp_chunkhdr *ch, chunk_buf;
11261         unsigned int chk_length;
11262
11263         if (!stcb) {
11264                 return;
11265         }
11266         asoc = &stcb->asoc;
11267         SCTP_TCB_LOCK_ASSERT(stcb);
11268         if (asoc->peer_supports_pktdrop == 0) {
11269                 /*-
11270                  * peer must declare support before I send one.
11271                  */
11272                 return;
11273         }
11274         if (stcb->sctp_socket == NULL) {
11275                 return;
11276         }
11277         sctp_alloc_a_chunk(stcb, chk);
11278         if (chk == NULL) {
11279                 return;
11280         }
11281         chk->copy_by_ref = 0;
11282         len -= iphlen;
11283         chk->send_size = len;
11284         /* Validate that we do not have an ABORT in here. */
11285         offset = iphlen + sizeof(struct sctphdr);
11286         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11287             sizeof(*ch), (uint8_t *) & chunk_buf);
11288         while (ch != NULL) {
11289                 chk_length = ntohs(ch->chunk_length);
11290                 if (chk_length < sizeof(*ch)) {
11291                         /* break to abort land */
11292                         break;
11293                 }
11294                 switch (ch->chunk_type) {
11295                 case SCTP_PACKET_DROPPED:
11296                 case SCTP_ABORT_ASSOCIATION:
11297                 case SCTP_INITIATION_ACK:
11298                         /**
11299                          * We don't respond with an PKT-DROP to an ABORT
11300                          * or PKT-DROP. We also do not respond to an
11301                          * INIT-ACK, because we can't know if the initiation
11302                          * tag is correct or not.
11303                          */
11304                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11305                         return;
11306                 default:
11307                         break;
11308                 }
11309                 offset += SCTP_SIZE32(chk_length);
11310                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11311                     sizeof(*ch), (uint8_t *) & chunk_buf);
11312         }
11313
11314         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11315             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11316                 /*
11317                  * only send 1 mtu worth, trim off the excess on the end.
11318                  */
11319                 fullsz = len;
11320                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11321                 was_trunc = 1;
11322         }
11323         chk->asoc = &stcb->asoc;
11324         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11325         if (chk->data == NULL) {
11326 jump_out:
11327                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11328                 return;
11329         }
11330         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11331         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11332         if (drp == NULL) {
11333                 sctp_m_freem(chk->data);
11334                 chk->data = NULL;
11335                 goto jump_out;
11336         }
11337         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11338             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11339         chk->book_size_scale = 0;
11340         if (was_trunc) {
11341                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11342                 drp->trunc_len = htons(fullsz);
11343                 /*
11344                  * Len is already adjusted to size minus overhead above take
11345                  * out the pkt_drop chunk itself from it.
11346                  */
11347                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11348                 len = chk->send_size;
11349         } else {
11350                 /* no truncation needed */
11351                 drp->ch.chunk_flags = 0;
11352                 drp->trunc_len = htons(0);
11353         }
11354         if (bad_crc) {
11355                 drp->ch.chunk_flags |= SCTP_BADCRC;
11356         }
11357         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11358         SCTP_BUF_LEN(chk->data) = chk->send_size;
11359         chk->sent = SCTP_DATAGRAM_UNSENT;
11360         chk->snd_count = 0;
11361         if (net) {
11362                 /* we should hit here */
11363                 chk->whoTo = net;
11364                 atomic_add_int(&chk->whoTo->ref_count, 1);
11365         } else {
11366                 chk->whoTo = NULL;
11367         }
11368         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11369         chk->rec.chunk_id.can_take_data = 1;
11370         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11371         drp->ch.chunk_length = htons(chk->send_size);
11372         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11373         if (spc < 0) {
11374                 spc = 0;
11375         }
11376         drp->bottle_bw = htonl(spc);
11377         if (asoc->my_rwnd) {
11378                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11379                     asoc->size_on_all_streams +
11380                     asoc->my_rwnd_control_len +
11381                     stcb->sctp_socket->so_rcv.sb_cc);
11382         } else {
11383                 /*-
11384                  * If my rwnd is 0, possibly from mbuf depletion as well as
11385                  * space used, tell the peer there is NO space aka onq == bw
11386                  */
11387                 drp->current_onq = htonl(spc);
11388         }
11389         drp->reserved = 0;
11390         datap = drp->data;
11391         m_copydata(m, iphlen, len, (caddr_t)datap);
11392         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11393         asoc->ctrl_queue_cnt++;
11394 }
11395
11396 void
11397 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11398 {
11399         struct sctp_association *asoc;
11400         struct sctp_cwr_chunk *cwr;
11401         struct sctp_tmit_chunk *chk;
11402
11403         SCTP_TCB_LOCK_ASSERT(stcb);
11404         if (net == NULL) {
11405                 return;
11406         }
11407         asoc = &stcb->asoc;
11408         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11409                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11410                         /*
11411                          * found a previous CWR queued to same destination
11412                          * update it if needed
11413                          */
11414                         uint32_t ctsn;
11415
11416                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11417                         ctsn = ntohl(cwr->tsn);
11418                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11419                                 cwr->tsn = htonl(high_tsn);
11420                         }
11421                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11422                                 /* Make sure override is carried */
11423                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11424                         }
11425                         return;
11426                 }
11427         }
11428         sctp_alloc_a_chunk(stcb, chk);
11429         if (chk == NULL) {
11430                 return;
11431         }
11432         chk->copy_by_ref = 0;
11433         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11434         chk->rec.chunk_id.can_take_data = 1;
11435         chk->asoc = &stcb->asoc;
11436         chk->send_size = sizeof(struct sctp_cwr_chunk);
11437         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11438         if (chk->data == NULL) {
11439                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11440                 return;
11441         }
11442         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11443         SCTP_BUF_LEN(chk->data) = chk->send_size;
11444         chk->sent = SCTP_DATAGRAM_UNSENT;
11445         chk->snd_count = 0;
11446         chk->whoTo = net;
11447         atomic_add_int(&chk->whoTo->ref_count, 1);
11448         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11449         cwr->ch.chunk_type = SCTP_ECN_CWR;
11450         cwr->ch.chunk_flags = override;
11451         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11452         cwr->tsn = htonl(high_tsn);
11453         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11454         asoc->ctrl_queue_cnt++;
11455 }
11456
11457 void
11458 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11459     int number_entries, uint16_t * list,
11460     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11461 {
11462         uint16_t len, old_len, i;
11463         struct sctp_stream_reset_out_request *req_out;
11464         struct sctp_chunkhdr *ch;
11465
11466         ch = mtod(chk->data, struct sctp_chunkhdr *);
11467         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11468
11469         /* get to new offset for the param. */
11470         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11471         /* now how long will this param be? */
11472         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11473         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11474         req_out->ph.param_length = htons(len);
11475         req_out->request_seq = htonl(seq);
11476         req_out->response_seq = htonl(resp_seq);
11477         req_out->send_reset_at_tsn = htonl(last_sent);
11478         if (number_entries) {
11479                 for (i = 0; i < number_entries; i++) {
11480                         req_out->list_of_streams[i] = htons(list[i]);
11481                 }
11482         }
11483         if (SCTP_SIZE32(len) > len) {
11484                 /*-
11485                  * Need to worry about the pad we may end up adding to the
11486                  * end. This is easy since the struct is either aligned to 4
11487                  * bytes or 2 bytes off.
11488                  */
11489                 req_out->list_of_streams[number_entries] = 0;
11490         }
11491         /* now fix the chunk length */
11492         ch->chunk_length = htons(len + old_len);
11493         chk->book_size = len + old_len;
11494         chk->book_size_scale = 0;
11495         chk->send_size = SCTP_SIZE32(chk->book_size);
11496         SCTP_BUF_LEN(chk->data) = chk->send_size;
11497         return;
11498 }
11499
11500 static void
11501 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11502     int number_entries, uint16_t * list,
11503     uint32_t seq)
11504 {
11505         uint16_t len, old_len, i;
11506         struct sctp_stream_reset_in_request *req_in;
11507         struct sctp_chunkhdr *ch;
11508
11509         ch = mtod(chk->data, struct sctp_chunkhdr *);
11510         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11511
11512         /* get to new offset for the param. */
11513         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11514         /* now how long will this param be? */
11515         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11516         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11517         req_in->ph.param_length = htons(len);
11518         req_in->request_seq = htonl(seq);
11519         if (number_entries) {
11520                 for (i = 0; i < number_entries; i++) {
11521                         req_in->list_of_streams[i] = htons(list[i]);
11522                 }
11523         }
11524         if (SCTP_SIZE32(len) > len) {
11525                 /*-
11526                  * Need to worry about the pad we may end up adding to the
11527                  * end. This is easy since the struct is either aligned to 4
11528                  * bytes or 2 bytes off.
11529                  */
11530                 req_in->list_of_streams[number_entries] = 0;
11531         }
11532         /* now fix the chunk length */
11533         ch->chunk_length = htons(len + old_len);
11534         chk->book_size = len + old_len;
11535         chk->book_size_scale = 0;
11536         chk->send_size = SCTP_SIZE32(chk->book_size);
11537         SCTP_BUF_LEN(chk->data) = chk->send_size;
11538         return;
11539 }
11540
11541 static void
11542 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11543     uint32_t seq)
11544 {
11545         uint16_t len, old_len;
11546         struct sctp_stream_reset_tsn_request *req_tsn;
11547         struct sctp_chunkhdr *ch;
11548
11549         ch = mtod(chk->data, struct sctp_chunkhdr *);
11550         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11551
11552         /* get to new offset for the param. */
11553         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11554         /* now how long will this param be? */
11555         len = sizeof(struct sctp_stream_reset_tsn_request);
11556         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11557         req_tsn->ph.param_length = htons(len);
11558         req_tsn->request_seq = htonl(seq);
11559
11560         /* now fix the chunk length */
11561         ch->chunk_length = htons(len + old_len);
11562         chk->send_size = len + old_len;
11563         chk->book_size = SCTP_SIZE32(chk->send_size);
11564         chk->book_size_scale = 0;
11565         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11566         return;
11567 }
11568
11569 void
11570 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11571     uint32_t resp_seq, uint32_t result)
11572 {
11573         uint16_t len, old_len;
11574         struct sctp_stream_reset_response *resp;
11575         struct sctp_chunkhdr *ch;
11576
11577         ch = mtod(chk->data, struct sctp_chunkhdr *);
11578         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11579
11580         /* get to new offset for the param. */
11581         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11582         /* now how long will this param be? */
11583         len = sizeof(struct sctp_stream_reset_response);
11584         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11585         resp->ph.param_length = htons(len);
11586         resp->response_seq = htonl(resp_seq);
11587         resp->result = ntohl(result);
11588
11589         /* now fix the chunk length */
11590         ch->chunk_length = htons(len + old_len);
11591         chk->book_size = len + old_len;
11592         chk->book_size_scale = 0;
11593         chk->send_size = SCTP_SIZE32(chk->book_size);
11594         SCTP_BUF_LEN(chk->data) = chk->send_size;
11595         return;
11596 }
11597
11598 void
11599 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11600     uint32_t resp_seq, uint32_t result,
11601     uint32_t send_una, uint32_t recv_next)
11602 {
11603         uint16_t len, old_len;
11604         struct sctp_stream_reset_response_tsn *resp;
11605         struct sctp_chunkhdr *ch;
11606
11607         ch = mtod(chk->data, struct sctp_chunkhdr *);
11608         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11609
11610         /* get to new offset for the param. */
11611         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11612         /* now how long will this param be? */
11613         len = sizeof(struct sctp_stream_reset_response_tsn);
11614         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11615         resp->ph.param_length = htons(len);
11616         resp->response_seq = htonl(resp_seq);
11617         resp->result = htonl(result);
11618         resp->senders_next_tsn = htonl(send_una);
11619         resp->receivers_next_tsn = htonl(recv_next);
11620
11621         /* now fix the chunk length */
11622         ch->chunk_length = htons(len + old_len);
11623         chk->book_size = len + old_len;
11624         chk->send_size = SCTP_SIZE32(chk->book_size);
11625         chk->book_size_scale = 0;
11626         SCTP_BUF_LEN(chk->data) = chk->send_size;
11627         return;
11628 }
11629
11630 static void
11631 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11632     uint32_t seq,
11633     uint16_t adding)
11634 {
11635         uint16_t len, old_len;
11636         struct sctp_chunkhdr *ch;
11637         struct sctp_stream_reset_add_strm *addstr;
11638
11639         ch = mtod(chk->data, struct sctp_chunkhdr *);
11640         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11641
11642         /* get to new offset for the param. */
11643         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11644         /* now how long will this param be? */
11645         len = sizeof(struct sctp_stream_reset_add_strm);
11646
11647         /* Fill it out. */
11648         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11649         addstr->ph.param_length = htons(len);
11650         addstr->request_seq = htonl(seq);
11651         addstr->number_of_streams = htons(adding);
11652         addstr->reserved = 0;
11653
11654         /* now fix the chunk length */
11655         ch->chunk_length = htons(len + old_len);
11656         chk->send_size = len + old_len;
11657         chk->book_size = SCTP_SIZE32(chk->send_size);
11658         chk->book_size_scale = 0;
11659         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11660         return;
11661 }
11662
11663 static void
11664 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11665     uint32_t seq,
11666     uint16_t adding)
11667 {
11668         uint16_t len, old_len;
11669         struct sctp_chunkhdr *ch;
11670         struct sctp_stream_reset_add_strm *addstr;
11671
11672         ch = mtod(chk->data, struct sctp_chunkhdr *);
11673         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11674
11675         /* get to new offset for the param. */
11676         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11677         /* now how long will this param be? */
11678         len = sizeof(struct sctp_stream_reset_add_strm);
11679         /* Fill it out. */
11680         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11681         addstr->ph.param_length = htons(len);
11682         addstr->request_seq = htonl(seq);
11683         addstr->number_of_streams = htons(adding);
11684         addstr->reserved = 0;
11685
11686         /* now fix the chunk length */
11687         ch->chunk_length = htons(len + old_len);
11688         chk->send_size = len + old_len;
11689         chk->book_size = SCTP_SIZE32(chk->send_size);
11690         chk->book_size_scale = 0;
11691         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11692         return;
11693 }
11694
11695 int
11696 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11697     int number_entries, uint16_t * list,
11698     uint8_t send_out_req,
11699     uint8_t send_in_req,
11700     uint8_t send_tsn_req,
11701     uint8_t add_stream,
11702     uint16_t adding_o,
11703     uint16_t adding_i, uint8_t peer_asked)
11704 {
11705
11706         struct sctp_association *asoc;
11707         struct sctp_tmit_chunk *chk;
11708         struct sctp_chunkhdr *ch;
11709         uint32_t seq;
11710
11711         asoc = &stcb->asoc;
11712         if (asoc->stream_reset_outstanding) {
11713                 /*-
11714                  * Already one pending, must get ACK back to clear the flag.
11715                  */
11716                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11717                 return (EBUSY);
11718         }
11719         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11720             (add_stream == 0)) {
11721                 /* nothing to do */
11722                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11723                 return (EINVAL);
11724         }
11725         if (send_tsn_req && (send_out_req || send_in_req)) {
11726                 /* error, can't do that */
11727                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11728                 return (EINVAL);
11729         }
11730         sctp_alloc_a_chunk(stcb, chk);
11731         if (chk == NULL) {
11732                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11733                 return (ENOMEM);
11734         }
11735         chk->copy_by_ref = 0;
11736         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11737         chk->rec.chunk_id.can_take_data = 0;
11738         chk->asoc = &stcb->asoc;
11739         chk->book_size = sizeof(struct sctp_chunkhdr);
11740         chk->send_size = SCTP_SIZE32(chk->book_size);
11741         chk->book_size_scale = 0;
11742
11743         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11744         if (chk->data == NULL) {
11745                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11746                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11747                 return (ENOMEM);
11748         }
11749         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11750
11751         /* setup chunk parameters */
11752         chk->sent = SCTP_DATAGRAM_UNSENT;
11753         chk->snd_count = 0;
11754         if (stcb->asoc.alternate) {
11755                 chk->whoTo = stcb->asoc.alternate;
11756         } else {
11757                 chk->whoTo = stcb->asoc.primary_destination;
11758         }
11759         atomic_add_int(&chk->whoTo->ref_count, 1);
11760         ch = mtod(chk->data, struct sctp_chunkhdr *);
11761         ch->chunk_type = SCTP_STREAM_RESET;
11762         ch->chunk_flags = 0;
11763         ch->chunk_length = htons(chk->book_size);
11764         SCTP_BUF_LEN(chk->data) = chk->send_size;
11765
11766         seq = stcb->asoc.str_reset_seq_out;
11767         if (send_out_req) {
11768                 sctp_add_stream_reset_out(chk, number_entries, list,
11769                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11770                 asoc->stream_reset_out_is_outstanding = 1;
11771                 seq++;
11772                 asoc->stream_reset_outstanding++;
11773         }
11774         if ((add_stream & 1) &&
11775             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11776                 /* Need to allocate more */
11777                 struct sctp_stream_out *oldstream;
11778                 struct sctp_stream_queue_pending *sp, *nsp;
11779                 int i;
11780
11781                 oldstream = stcb->asoc.strmout;
11782                 /* get some more */
11783                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11784                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11785                     SCTP_M_STRMO);
11786                 if (stcb->asoc.strmout == NULL) {
11787                         uint8_t x;
11788
11789                         stcb->asoc.strmout = oldstream;
11790                         /* Turn off the bit */
11791                         x = add_stream & 0xfe;
11792                         add_stream = x;
11793                         goto skip_stuff;
11794                 }
11795                 /*
11796                  * Ok now we proceed with copying the old out stuff and
11797                  * initializing the new stuff.
11798                  */
11799                 SCTP_TCB_SEND_LOCK(stcb);
11800                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11801                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11802                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11803                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11804                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11805                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11806                         stcb->asoc.strmout[i].stream_no = i;
11807                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11808                         /* now anything on those queues? */
11809                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11810                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11811                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11812                         }
11813                         /* Now move assoc pointers too */
11814                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11815                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11816                         }
11817                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11818                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11819                         }
11820                 }
11821                 /* now the new streams */
11822                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11823                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11824                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11825                         stcb->asoc.strmout[i].chunks_on_queues = 0;
11826                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
11827                         stcb->asoc.strmout[i].stream_no = i;
11828                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11829                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11830                 }
11831                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11832                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11833                 SCTP_TCB_SEND_UNLOCK(stcb);
11834         }
11835 skip_stuff:
11836         if ((add_stream & 1) && (adding_o > 0)) {
11837                 asoc->strm_pending_add_size = adding_o;
11838                 asoc->peer_req_out = peer_asked;
11839                 sctp_add_an_out_stream(chk, seq, adding_o);
11840                 seq++;
11841                 asoc->stream_reset_outstanding++;
11842         }
11843         if ((add_stream & 2) && (adding_i > 0)) {
11844                 sctp_add_an_in_stream(chk, seq, adding_i);
11845                 seq++;
11846                 asoc->stream_reset_outstanding++;
11847         }
11848         if (send_in_req) {
11849                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11850                 seq++;
11851                 asoc->stream_reset_outstanding++;
11852         }
11853         if (send_tsn_req) {
11854                 sctp_add_stream_reset_tsn(chk, seq);
11855                 asoc->stream_reset_outstanding++;
11856         }
11857         asoc->str_reset = chk;
11858         /* insert the chunk for sending */
11859         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11860             chk,
11861             sctp_next);
11862         asoc->ctrl_queue_cnt++;
11863         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11864         return (0);
11865 }
11866
11867 void
11868 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11869     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11870     uint8_t use_mflowid, uint32_t mflowid,
11871     uint32_t vrf_id, uint16_t port)
11872 {
11873         /* Don't respond to an ABORT with an ABORT. */
11874         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11875                 if (cause)
11876                         sctp_m_freem(cause);
11877                 return;
11878         }
11879         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11880             use_mflowid, mflowid,
11881             vrf_id, port);
11882         return;
11883 }
11884
11885 void
11886 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11887     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11888     uint8_t use_mflowid, uint32_t mflowid,
11889     uint32_t vrf_id, uint16_t port)
11890 {
11891         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11892             use_mflowid, mflowid,
11893             vrf_id, port);
11894         return;
11895 }
11896
11897 static struct mbuf *
11898 sctp_copy_resume(struct uio *uio,
11899     int max_send_len,
11900     int user_marks_eor,
11901     int *error,
11902     uint32_t * sndout,
11903     struct mbuf **new_tail)
11904 {
11905         struct mbuf *m;
11906
11907         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11908             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11909         if (m == NULL) {
11910                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11911                 *error = ENOMEM;
11912         } else {
11913                 *sndout = m_length(m, NULL);
11914                 *new_tail = m_last(m);
11915         }
11916         return (m);
11917 }
11918
11919 static int
11920 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11921     struct uio *uio,
11922     int resv_upfront)
11923 {
11924         int left;
11925
11926         left = sp->length;
11927         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11928             resv_upfront, 0);
11929         if (sp->data == NULL) {
11930                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11931                 return (ENOMEM);
11932         }
11933         sp->tail_mbuf = m_last(sp->data);
11934         return (0);
11935 }
11936
11937
11938
11939 static struct sctp_stream_queue_pending *
11940 sctp_copy_it_in(struct sctp_tcb *stcb,
11941     struct sctp_association *asoc,
11942     struct sctp_sndrcvinfo *srcv,
11943     struct uio *uio,
11944     struct sctp_nets *net,
11945     int max_send_len,
11946     int user_marks_eor,
11947     int *error)
11948 {
11949         /*-
11950          * This routine must be very careful in its work. Protocol
11951          * processing is up and running so care must be taken to spl...()
11952          * when you need to do something that may effect the stcb/asoc. The
11953          * sb is locked however. When data is copied the protocol processing
11954          * should be enabled since this is a slower operation...
11955          */
11956         struct sctp_stream_queue_pending *sp = NULL;
11957         int resv_in_first;
11958
11959         *error = 0;
11960         /* Now can we send this? */
11961         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11962             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11963             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11964             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11965                 /* got data while shutting down */
11966                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11967                 *error = ECONNRESET;
11968                 goto out_now;
11969         }
11970         sctp_alloc_a_strmoq(stcb, sp);
11971         if (sp == NULL) {
11972                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11973                 *error = ENOMEM;
11974                 goto out_now;
11975         }
11976         sp->act_flags = 0;
11977         sp->sender_all_done = 0;
11978         sp->sinfo_flags = srcv->sinfo_flags;
11979         sp->timetolive = srcv->sinfo_timetolive;
11980         sp->ppid = srcv->sinfo_ppid;
11981         sp->context = srcv->sinfo_context;
11982         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11983
11984         sp->stream = srcv->sinfo_stream;
11985         sp->length = min(uio->uio_resid, max_send_len);
11986         if ((sp->length == (uint32_t) uio->uio_resid) &&
11987             ((user_marks_eor == 0) ||
11988             (srcv->sinfo_flags & SCTP_EOF) ||
11989             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11990                 sp->msg_is_complete = 1;
11991         } else {
11992                 sp->msg_is_complete = 0;
11993         }
11994         sp->sender_all_done = 0;
11995         sp->some_taken = 0;
11996         sp->put_last_out = 0;
11997         resv_in_first = sizeof(struct sctp_data_chunk);
11998         sp->data = sp->tail_mbuf = NULL;
11999         if (sp->length == 0) {
12000                 *error = 0;
12001                 goto skip_copy;
12002         }
12003         if (srcv->sinfo_keynumber_valid) {
12004                 sp->auth_keyid = srcv->sinfo_keynumber;
12005         } else {
12006                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12007         }
12008         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12009                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12010                 sp->holds_key_ref = 1;
12011         }
12012         *error = sctp_copy_one(sp, uio, resv_in_first);
12013 skip_copy:
12014         if (*error) {
12015                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12016                 sp = NULL;
12017         } else {
12018                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12019                         sp->net = net;
12020                         atomic_add_int(&sp->net->ref_count, 1);
12021                 } else {
12022                         sp->net = NULL;
12023                 }
12024                 sctp_set_prsctp_policy(sp);
12025         }
12026 out_now:
12027         return (sp);
12028 }
12029
12030
12031 int
12032 sctp_sosend(struct socket *so,
12033     struct sockaddr *addr,
12034     struct uio *uio,
12035     struct mbuf *top,
12036     struct mbuf *control,
12037     int flags,
12038     struct thread *p
12039 )
12040 {
12041         int error, use_sndinfo = 0;
12042         struct sctp_sndrcvinfo sndrcvninfo;
12043         struct sockaddr *addr_to_use;
12044
12045 #if defined(INET) && defined(INET6)
12046         struct sockaddr_in sin;
12047
12048 #endif
12049
12050         if (control) {
12051                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12052                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12053                     sizeof(sndrcvninfo))) {
12054                         /* got one */
12055                         use_sndinfo = 1;
12056                 }
12057         }
12058         addr_to_use = addr;
12059 #if defined(INET) && defined(INET6)
12060         if ((addr) && (addr->sa_family == AF_INET6)) {
12061                 struct sockaddr_in6 *sin6;
12062
12063                 sin6 = (struct sockaddr_in6 *)addr;
12064                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12065                         in6_sin6_2_sin(&sin, sin6);
12066                         addr_to_use = (struct sockaddr *)&sin;
12067                 }
12068         }
12069 #endif
12070         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12071             control,
12072             flags,
12073             use_sndinfo ? &sndrcvninfo : NULL
12074             ,p
12075             );
12076         return (error);
12077 }
12078
12079
12080 int
12081 sctp_lower_sosend(struct socket *so,
12082     struct sockaddr *addr,
12083     struct uio *uio,
12084     struct mbuf *i_pak,
12085     struct mbuf *control,
12086     int flags,
12087     struct sctp_sndrcvinfo *srcv
12088     ,
12089     struct thread *p
12090 )
12091 {
12092         unsigned int sndlen = 0, max_len;
12093         int error, len;
12094         struct mbuf *top = NULL;
12095         int queue_only = 0, queue_only_for_init = 0;
12096         int free_cnt_applied = 0;
12097         int un_sent;
12098         int now_filled = 0;
12099         unsigned int inqueue_bytes = 0;
12100         struct sctp_block_entry be;
12101         struct sctp_inpcb *inp;
12102         struct sctp_tcb *stcb = NULL;
12103         struct timeval now;
12104         struct sctp_nets *net;
12105         struct sctp_association *asoc;
12106         struct sctp_inpcb *t_inp;
12107         int user_marks_eor;
12108         int create_lock_applied = 0;
12109         int nagle_applies = 0;
12110         int some_on_control = 0;
12111         int got_all_of_the_send = 0;
12112         int hold_tcblock = 0;
12113         int non_blocking = 0;
12114         uint32_t local_add_more, local_soresv = 0;
12115         uint16_t port;
12116         uint16_t sinfo_flags;
12117         sctp_assoc_t sinfo_assoc_id;
12118
12119         error = 0;
12120         net = NULL;
12121         stcb = NULL;
12122         asoc = NULL;
12123
12124         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12125         if (inp == NULL) {
12126                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12127                 error = EINVAL;
12128                 if (i_pak) {
12129                         SCTP_RELEASE_PKT(i_pak);
12130                 }
12131                 return (error);
12132         }
12133         if ((uio == NULL) && (i_pak == NULL)) {
12134                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12135                 return (EINVAL);
12136         }
12137         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12138         atomic_add_int(&inp->total_sends, 1);
12139         if (uio) {
12140                 if (uio->uio_resid < 0) {
12141                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12142                         return (EINVAL);
12143                 }
12144                 sndlen = uio->uio_resid;
12145         } else {
12146                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12147                 sndlen = SCTP_HEADER_LEN(i_pak);
12148         }
12149         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12150             (void *)addr,
12151             sndlen);
12152         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12153             (inp->sctp_socket->so_qlimit)) {
12154                 /* The listener can NOT send */
12155                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12156                 error = ENOTCONN;
12157                 goto out_unlocked;
12158         }
12159         /**
12160          * Pre-screen address, if one is given the sin-len
12161          * must be set correctly!
12162          */
12163         if (addr) {
12164                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12165
12166                 switch (raddr->sa.sa_family) {
12167 #ifdef INET
12168                 case AF_INET:
12169                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12170                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12171                                 error = EINVAL;
12172                                 goto out_unlocked;
12173                         }
12174                         port = raddr->sin.sin_port;
12175                         break;
12176 #endif
12177 #ifdef INET6
12178                 case AF_INET6:
12179                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12180                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12181                                 error = EINVAL;
12182                                 goto out_unlocked;
12183                         }
12184                         port = raddr->sin6.sin6_port;
12185                         break;
12186 #endif
12187                 default:
12188                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12189                         error = EAFNOSUPPORT;
12190                         goto out_unlocked;
12191                 }
12192         } else
12193                 port = 0;
12194
12195         if (srcv) {
12196                 sinfo_flags = srcv->sinfo_flags;
12197                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12198                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12199                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12200                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12201                         error = EINVAL;
12202                         goto out_unlocked;
12203                 }
12204                 if (srcv->sinfo_flags)
12205                         SCTP_STAT_INCR(sctps_sends_with_flags);
12206         } else {
12207                 sinfo_flags = inp->def_send.sinfo_flags;
12208                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12209         }
12210         if (sinfo_flags & SCTP_SENDALL) {
12211                 /* its a sendall */
12212                 error = sctp_sendall(inp, uio, top, srcv);
12213                 top = NULL;
12214                 goto out_unlocked;
12215         }
12216         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12217                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12218                 error = EINVAL;
12219                 goto out_unlocked;
12220         }
12221         /* now we must find the assoc */
12222         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12223             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12224                 SCTP_INP_RLOCK(inp);
12225                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12226                 if (stcb) {
12227                         SCTP_TCB_LOCK(stcb);
12228                         hold_tcblock = 1;
12229                 }
12230                 SCTP_INP_RUNLOCK(inp);
12231         } else if (sinfo_assoc_id) {
12232                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12233         } else if (addr) {
12234                 /*-
12235                  * Since we did not use findep we must
12236                  * increment it, and if we don't find a tcb
12237                  * decrement it.
12238                  */
12239                 SCTP_INP_WLOCK(inp);
12240                 SCTP_INP_INCR_REF(inp);
12241                 SCTP_INP_WUNLOCK(inp);
12242                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12243                 if (stcb == NULL) {
12244                         SCTP_INP_WLOCK(inp);
12245                         SCTP_INP_DECR_REF(inp);
12246                         SCTP_INP_WUNLOCK(inp);
12247                 } else {
12248                         hold_tcblock = 1;
12249                 }
12250         }
12251         if ((stcb == NULL) && (addr)) {
12252                 /* Possible implicit send? */
12253                 SCTP_ASOC_CREATE_LOCK(inp);
12254                 create_lock_applied = 1;
12255                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12256                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12257                         /* Should I really unlock ? */
12258                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12259                         error = EINVAL;
12260                         goto out_unlocked;
12261
12262                 }
12263                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12264                     (addr->sa_family == AF_INET6)) {
12265                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12266                         error = EINVAL;
12267                         goto out_unlocked;
12268                 }
12269                 SCTP_INP_WLOCK(inp);
12270                 SCTP_INP_INCR_REF(inp);
12271                 SCTP_INP_WUNLOCK(inp);
12272                 /* With the lock applied look again */
12273                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12274                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12275                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12276                 }
12277                 if (stcb == NULL) {
12278                         SCTP_INP_WLOCK(inp);
12279                         SCTP_INP_DECR_REF(inp);
12280                         SCTP_INP_WUNLOCK(inp);
12281                 } else {
12282                         hold_tcblock = 1;
12283                 }
12284                 if (error) {
12285                         goto out_unlocked;
12286                 }
12287                 if (t_inp != inp) {
12288                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12289                         error = ENOTCONN;
12290                         goto out_unlocked;
12291                 }
12292         }
12293         if (stcb == NULL) {
12294                 if (addr == NULL) {
12295                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12296                         error = ENOENT;
12297                         goto out_unlocked;
12298                 } else {
12299                         /* We must go ahead and start the INIT process */
12300                         uint32_t vrf_id;
12301
12302                         if ((sinfo_flags & SCTP_ABORT) ||
12303                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12304                                 /*-
12305                                  * User asks to abort a non-existant assoc,
12306                                  * or EOF a non-existant assoc with no data
12307                                  */
12308                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12309                                 error = ENOENT;
12310                                 goto out_unlocked;
12311                         }
12312                         /* get an asoc/stcb struct */
12313                         vrf_id = inp->def_vrf_id;
12314 #ifdef INVARIANTS
12315                         if (create_lock_applied == 0) {
12316                                 panic("Error, should hold create lock and I don't?");
12317                         }
12318 #endif
12319                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12320                             p
12321                             );
12322                         if (stcb == NULL) {
12323                                 /* Error is setup for us in the call */
12324                                 goto out_unlocked;
12325                         }
12326                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12327                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12328                                 /*
12329                                  * Set the connected flag so we can queue
12330                                  * data
12331                                  */
12332                                 soisconnecting(so);
12333                         }
12334                         hold_tcblock = 1;
12335                         if (create_lock_applied) {
12336                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12337                                 create_lock_applied = 0;
12338                         } else {
12339                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12340                         }
12341                         /*
12342                          * Turn on queue only flag to prevent data from
12343                          * being sent
12344                          */
12345                         queue_only = 1;
12346                         asoc = &stcb->asoc;
12347                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12348                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12349
12350                         /* initialize authentication params for the assoc */
12351                         sctp_initialize_auth_params(inp, stcb);
12352
12353                         if (control) {
12354                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12355                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12356                                         hold_tcblock = 0;
12357                                         stcb = NULL;
12358                                         goto out_unlocked;
12359                                 }
12360                         }
12361                         /* out with the INIT */
12362                         queue_only_for_init = 1;
12363                         /*-
12364                          * we may want to dig in after this call and adjust the MTU
12365                          * value. It defaulted to 1500 (constant) but the ro
12366                          * structure may now have an update and thus we may need to
12367                          * change it BEFORE we append the message.
12368                          */
12369                 }
12370         } else
12371                 asoc = &stcb->asoc;
12372         if (srcv == NULL)
12373                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12374         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12375                 if (addr)
12376                         net = sctp_findnet(stcb, addr);
12377                 else
12378                         net = NULL;
12379                 if ((net == NULL) ||
12380                     ((port != 0) && (port != stcb->rport))) {
12381                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12382                         error = EINVAL;
12383                         goto out_unlocked;
12384                 }
12385         } else {
12386                 if (stcb->asoc.alternate) {
12387                         net = stcb->asoc.alternate;
12388                 } else {
12389                         net = stcb->asoc.primary_destination;
12390                 }
12391         }
12392         atomic_add_int(&stcb->total_sends, 1);
12393         /* Keep the stcb from being freed under our feet */
12394         atomic_add_int(&asoc->refcnt, 1);
12395         free_cnt_applied = 1;
12396
12397         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12398                 if (sndlen > asoc->smallest_mtu) {
12399                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12400                         error = EMSGSIZE;
12401                         goto out_unlocked;
12402                 }
12403         }
12404         if (SCTP_SO_IS_NBIO(so)
12405             || (flags & MSG_NBIO)
12406             ) {
12407                 non_blocking = 1;
12408         }
12409         /* would we block? */
12410         if (non_blocking) {
12411                 if (hold_tcblock == 0) {
12412                         SCTP_TCB_LOCK(stcb);
12413                         hold_tcblock = 1;
12414                 }
12415                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12416                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12417                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12418                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12419                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12420                                 error = EMSGSIZE;
12421                         else
12422                                 error = EWOULDBLOCK;
12423                         goto out_unlocked;
12424                 }
12425                 stcb->asoc.sb_send_resv += sndlen;
12426                 SCTP_TCB_UNLOCK(stcb);
12427                 hold_tcblock = 0;
12428         } else {
12429                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12430         }
12431         local_soresv = sndlen;
12432         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12433                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12434                 error = ECONNRESET;
12435                 goto out_unlocked;
12436         }
12437         if (create_lock_applied) {
12438                 SCTP_ASOC_CREATE_UNLOCK(inp);
12439                 create_lock_applied = 0;
12440         }
12441         if (asoc->stream_reset_outstanding) {
12442                 /*
12443                  * Can't queue any data while stream reset is underway.
12444                  */
12445                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12446                 error = EAGAIN;
12447                 goto out_unlocked;
12448         }
12449         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12450             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12451                 queue_only = 1;
12452         }
12453         /* we are now done with all control */
12454         if (control) {
12455                 sctp_m_freem(control);
12456                 control = NULL;
12457         }
12458         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12459             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12460             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12461             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12462                 if (srcv->sinfo_flags & SCTP_ABORT) {
12463                         ;
12464                 } else {
12465                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12466                         error = ECONNRESET;
12467                         goto out_unlocked;
12468                 }
12469         }
12470         /* Ok, we will attempt a msgsnd :> */
12471         if (p) {
12472                 p->td_ru.ru_msgsnd++;
12473         }
12474         /* Are we aborting? */
12475         if (srcv->sinfo_flags & SCTP_ABORT) {
12476                 struct mbuf *mm;
12477                 int tot_demand, tot_out = 0, max_out;
12478
12479                 SCTP_STAT_INCR(sctps_sends_with_abort);
12480                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12481                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12482                         /* It has to be up before we abort */
12483                         /* how big is the user initiated abort? */
12484                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12485                         error = EINVAL;
12486                         goto out;
12487                 }
12488                 if (hold_tcblock) {
12489                         SCTP_TCB_UNLOCK(stcb);
12490                         hold_tcblock = 0;
12491                 }
12492                 if (top) {
12493                         struct mbuf *cntm = NULL;
12494
12495                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12496                         if (sndlen != 0) {
12497                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12498                                         tot_out += SCTP_BUF_LEN(cntm);
12499                                 }
12500                         }
12501                 } else {
12502                         /* Must fit in a MTU */
12503                         tot_out = sndlen;
12504                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12505                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12506                                 /* To big */
12507                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12508                                 error = EMSGSIZE;
12509                                 goto out;
12510                         }
12511                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12512                 }
12513                 if (mm == NULL) {
12514                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12515                         error = ENOMEM;
12516                         goto out;
12517                 }
12518                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12519                 max_out -= sizeof(struct sctp_abort_msg);
12520                 if (tot_out > max_out) {
12521                         tot_out = max_out;
12522                 }
12523                 if (mm) {
12524                         struct sctp_paramhdr *ph;
12525
12526                         /* now move forward the data pointer */
12527                         ph = mtod(mm, struct sctp_paramhdr *);
12528                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12529                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12530                         ph++;
12531                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12532                         if (top == NULL) {
12533                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12534                                 if (error) {
12535                                         /*-
12536                                          * Here if we can't get his data we
12537                                          * still abort we just don't get to
12538                                          * send the users note :-0
12539                                          */
12540                                         sctp_m_freem(mm);
12541                                         mm = NULL;
12542                                 }
12543                         } else {
12544                                 if (sndlen != 0) {
12545                                         SCTP_BUF_NEXT(mm) = top;
12546                                 }
12547                         }
12548                 }
12549                 if (hold_tcblock == 0) {
12550                         SCTP_TCB_LOCK(stcb);
12551                 }
12552                 atomic_add_int(&stcb->asoc.refcnt, -1);
12553                 free_cnt_applied = 0;
12554                 /* release this lock, otherwise we hang on ourselves */
12555                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12556                 /* now relock the stcb so everything is sane */
12557                 hold_tcblock = 0;
12558                 stcb = NULL;
12559                 /*
12560                  * In this case top is already chained to mm avoid double
12561                  * free, since we free it below if top != NULL and driver
12562                  * would free it after sending the packet out
12563                  */
12564                 if (sndlen != 0) {
12565                         top = NULL;
12566                 }
12567                 goto out_unlocked;
12568         }
12569         /* Calculate the maximum we can send */
12570         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12571         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12572                 if (non_blocking) {
12573                         /* we already checked for non-blocking above. */
12574                         max_len = sndlen;
12575                 } else {
12576                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12577                 }
12578         } else {
12579                 max_len = 0;
12580         }
12581         if (hold_tcblock) {
12582                 SCTP_TCB_UNLOCK(stcb);
12583                 hold_tcblock = 0;
12584         }
12585         /* Is the stream no. valid? */
12586         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12587                 /* Invalid stream number */
12588                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12589                 error = EINVAL;
12590                 goto out_unlocked;
12591         }
12592         if (asoc->strmout == NULL) {
12593                 /* huh? software error */
12594                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12595                 error = EFAULT;
12596                 goto out_unlocked;
12597         }
12598         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12599         if ((user_marks_eor == 0) &&
12600             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12601                 /* It will NEVER fit */
12602                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12603                 error = EMSGSIZE;
12604                 goto out_unlocked;
12605         }
12606         if ((uio == NULL) && user_marks_eor) {
12607                 /*-
12608                  * We do not support eeor mode for
12609                  * sending with mbuf chains (like sendfile).
12610                  */
12611                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12612                 error = EINVAL;
12613                 goto out_unlocked;
12614         }
12615         if (user_marks_eor) {
12616                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12617         } else {
12618                 /*-
12619                  * For non-eeor the whole message must fit in
12620                  * the socket send buffer.
12621                  */
12622                 local_add_more = sndlen;
12623         }
12624         len = 0;
12625         if (non_blocking) {
12626                 goto skip_preblock;
12627         }
12628         if (((max_len <= local_add_more) &&
12629             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12630             (max_len == 0) ||
12631             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12632                 /* No room right now ! */
12633                 SOCKBUF_LOCK(&so->so_snd);
12634                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12635                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12636                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12637                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12638                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12639                             inqueue_bytes,
12640                             local_add_more,
12641                             stcb->asoc.stream_queue_cnt,
12642                             stcb->asoc.chunks_on_out_queue,
12643                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12644                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12645                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12646                         }
12647                         be.error = 0;
12648                         stcb->block_entry = &be;
12649                         error = sbwait(&so->so_snd);
12650                         stcb->block_entry = NULL;
12651                         if (error || so->so_error || be.error) {
12652                                 if (error == 0) {
12653                                         if (so->so_error)
12654                                                 error = so->so_error;
12655                                         if (be.error) {
12656                                                 error = be.error;
12657                                         }
12658                                 }
12659                                 SOCKBUF_UNLOCK(&so->so_snd);
12660                                 goto out_unlocked;
12661                         }
12662                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12663                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12664                                     asoc, stcb->asoc.total_output_queue_size);
12665                         }
12666                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12667                                 goto out_unlocked;
12668                         }
12669                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12670                 }
12671                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12672                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12673                 } else {
12674                         max_len = 0;
12675                 }
12676                 SOCKBUF_UNLOCK(&so->so_snd);
12677         }
12678 skip_preblock:
12679         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12680                 goto out_unlocked;
12681         }
12682         /*
12683          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12684          * case NOTE: uio will be null when top/mbuf is passed
12685          */
12686         if (sndlen == 0) {
12687                 if (srcv->sinfo_flags & SCTP_EOF) {
12688                         got_all_of_the_send = 1;
12689                         goto dataless_eof;
12690                 } else {
12691                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12692                         error = EINVAL;
12693                         goto out;
12694                 }
12695         }
12696         if (top == NULL) {
12697                 struct sctp_stream_queue_pending *sp;
12698                 struct sctp_stream_out *strm;
12699                 uint32_t sndout;
12700
12701                 SCTP_TCB_SEND_LOCK(stcb);
12702                 if ((asoc->stream_locked) &&
12703                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12704                         SCTP_TCB_SEND_UNLOCK(stcb);
12705                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12706                         error = EINVAL;
12707                         goto out;
12708                 }
12709                 SCTP_TCB_SEND_UNLOCK(stcb);
12710
12711                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12712                 if (strm->last_msg_incomplete == 0) {
12713         do_a_copy_in:
12714                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12715                         if ((sp == NULL) || (error)) {
12716                                 goto out;
12717                         }
12718                         SCTP_TCB_SEND_LOCK(stcb);
12719                         if (sp->msg_is_complete) {
12720                                 strm->last_msg_incomplete = 0;
12721                                 asoc->stream_locked = 0;
12722                         } else {
12723                                 /*
12724                                  * Just got locked to this guy in case of an
12725                                  * interrupt.
12726                                  */
12727                                 strm->last_msg_incomplete = 1;
12728                                 asoc->stream_locked = 1;
12729                                 asoc->stream_locked_on = srcv->sinfo_stream;
12730                                 sp->sender_all_done = 0;
12731                         }
12732                         sctp_snd_sb_alloc(stcb, sp->length);
12733                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12734                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
12735                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12736                         }
12737                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12738                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12739                         SCTP_TCB_SEND_UNLOCK(stcb);
12740                 } else {
12741                         SCTP_TCB_SEND_LOCK(stcb);
12742                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12743                         SCTP_TCB_SEND_UNLOCK(stcb);
12744                         if (sp == NULL) {
12745                                 /* ???? Huh ??? last msg is gone */
12746 #ifdef INVARIANTS
12747                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12748 #else
12749                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12750                                 strm->last_msg_incomplete = 0;
12751 #endif
12752                                 goto do_a_copy_in;
12753
12754                         }
12755                 }
12756                 while (uio->uio_resid > 0) {
12757                         /* How much room do we have? */
12758                         struct mbuf *new_tail, *mm;
12759
12760                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12761                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12762                         else
12763                                 max_len = 0;
12764
12765                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12766                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12767                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12768                                 sndout = 0;
12769                                 new_tail = NULL;
12770                                 if (hold_tcblock) {
12771                                         SCTP_TCB_UNLOCK(stcb);
12772                                         hold_tcblock = 0;
12773                                 }
12774                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12775                                 if ((mm == NULL) || error) {
12776                                         if (mm) {
12777                                                 sctp_m_freem(mm);
12778                                         }
12779                                         goto out;
12780                                 }
12781                                 /* Update the mbuf and count */
12782                                 SCTP_TCB_SEND_LOCK(stcb);
12783                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12784                                         /*
12785                                          * we need to get out. Peer probably
12786                                          * aborted.
12787                                          */
12788                                         sctp_m_freem(mm);
12789                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12790                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12791                                                 error = ECONNRESET;
12792                                         }
12793                                         SCTP_TCB_SEND_UNLOCK(stcb);
12794                                         goto out;
12795                                 }
12796                                 if (sp->tail_mbuf) {
12797                                         /* tack it to the end */
12798                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12799                                         sp->tail_mbuf = new_tail;
12800                                 } else {
12801                                         /* A stolen mbuf */
12802                                         sp->data = mm;
12803                                         sp->tail_mbuf = new_tail;
12804                                 }
12805                                 sctp_snd_sb_alloc(stcb, sndout);
12806                                 atomic_add_int(&sp->length, sndout);
12807                                 len += sndout;
12808
12809                                 /* Did we reach EOR? */
12810                                 if ((uio->uio_resid == 0) &&
12811                                     ((user_marks_eor == 0) ||
12812                                     (srcv->sinfo_flags & SCTP_EOF) ||
12813                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12814                                         sp->msg_is_complete = 1;
12815                                 } else {
12816                                         sp->msg_is_complete = 0;
12817                                 }
12818                                 SCTP_TCB_SEND_UNLOCK(stcb);
12819                         }
12820                         if (uio->uio_resid == 0) {
12821                                 /* got it all? */
12822                                 continue;
12823                         }
12824                         /* PR-SCTP? */
12825                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12826                                 /*
12827                                  * This is ugly but we must assure locking
12828                                  * order
12829                                  */
12830                                 if (hold_tcblock == 0) {
12831                                         SCTP_TCB_LOCK(stcb);
12832                                         hold_tcblock = 1;
12833                                 }
12834                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12835                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12836                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12837                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12838                                 else
12839                                         max_len = 0;
12840                                 if (max_len > 0) {
12841                                         continue;
12842                                 }
12843                                 SCTP_TCB_UNLOCK(stcb);
12844                                 hold_tcblock = 0;
12845                         }
12846                         /* wait for space now */
12847                         if (non_blocking) {
12848                                 /* Non-blocking io in place out */
12849                                 goto skip_out_eof;
12850                         }
12851                         /* What about the INIT, send it maybe */
12852                         if (queue_only_for_init) {
12853                                 if (hold_tcblock == 0) {
12854                                         SCTP_TCB_LOCK(stcb);
12855                                         hold_tcblock = 1;
12856                                 }
12857                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12858                                         /* a collision took us forward? */
12859                                         queue_only = 0;
12860                                 } else {
12861                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12862                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12863                                         queue_only = 1;
12864                                 }
12865                         }
12866                         if ((net->flight_size > net->cwnd) &&
12867                             (asoc->sctp_cmt_on_off == 0)) {
12868                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12869                                 queue_only = 1;
12870                         } else if (asoc->ifp_had_enobuf) {
12871                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12872                                 if (net->flight_size > (2 * net->mtu)) {
12873                                         queue_only = 1;
12874                                 }
12875                                 asoc->ifp_had_enobuf = 0;
12876                         }
12877                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12878                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12879                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12880                             (stcb->asoc.total_flight > 0) &&
12881                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12882                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12883
12884                                 /*-
12885                                  * Ok, Nagle is set on and we have data outstanding.
12886                                  * Don't send anything and let SACKs drive out the
12887                                  * data unless wen have a "full" segment to send.
12888                                  */
12889                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12890                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12891                                 }
12892                                 SCTP_STAT_INCR(sctps_naglequeued);
12893                                 nagle_applies = 1;
12894                         } else {
12895                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12896                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12897                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12898                                 }
12899                                 SCTP_STAT_INCR(sctps_naglesent);
12900                                 nagle_applies = 0;
12901                         }
12902                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12903
12904                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12905                                     nagle_applies, un_sent);
12906                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12907                                     stcb->asoc.total_flight,
12908                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12909                         }
12910                         if (queue_only_for_init)
12911                                 queue_only_for_init = 0;
12912                         if ((queue_only == 0) && (nagle_applies == 0)) {
12913                                 /*-
12914                                  * need to start chunk output
12915                                  * before blocking.. note that if
12916                                  * a lock is already applied, then
12917                                  * the input via the net is happening
12918                                  * and I don't need to start output :-D
12919                                  */
12920                                 if (hold_tcblock == 0) {
12921                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12922                                                 hold_tcblock = 1;
12923                                                 sctp_chunk_output(inp,
12924                                                     stcb,
12925                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12926                                         }
12927                                 } else {
12928                                         sctp_chunk_output(inp,
12929                                             stcb,
12930                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12931                                 }
12932                                 if (hold_tcblock == 1) {
12933                                         SCTP_TCB_UNLOCK(stcb);
12934                                         hold_tcblock = 0;
12935                                 }
12936                         }
12937                         SOCKBUF_LOCK(&so->so_snd);
12938                         /*-
12939                          * This is a bit strange, but I think it will
12940                          * work. The total_output_queue_size is locked and
12941                          * protected by the TCB_LOCK, which we just released.
12942                          * There is a race that can occur between releasing it
12943                          * above, and me getting the socket lock, where sacks
12944                          * come in but we have not put the SB_WAIT on the
12945                          * so_snd buffer to get the wakeup. After the LOCK
12946                          * is applied the sack_processing will also need to
12947                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12948                          * once we have the socket buffer lock if we recheck the
12949                          * size we KNOW we will get to sleep safely with the
12950                          * wakeup flag in place.
12951                          */
12952                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12953                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
12954                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12955                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12956                                             asoc, uio->uio_resid);
12957                                 }
12958                                 be.error = 0;
12959                                 stcb->block_entry = &be;
12960                                 error = sbwait(&so->so_snd);
12961                                 stcb->block_entry = NULL;
12962
12963                                 if (error || so->so_error || be.error) {
12964                                         if (error == 0) {
12965                                                 if (so->so_error)
12966                                                         error = so->so_error;
12967                                                 if (be.error) {
12968                                                         error = be.error;
12969                                                 }
12970                                         }
12971                                         SOCKBUF_UNLOCK(&so->so_snd);
12972                                         goto out_unlocked;
12973                                 }
12974                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12975                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12976                                             asoc, stcb->asoc.total_output_queue_size);
12977                                 }
12978                         }
12979                         SOCKBUF_UNLOCK(&so->so_snd);
12980                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12981                                 goto out_unlocked;
12982                         }
12983                 }
12984                 SCTP_TCB_SEND_LOCK(stcb);
12985                 if (sp) {
12986                         if (sp->msg_is_complete == 0) {
12987                                 strm->last_msg_incomplete = 1;
12988                                 asoc->stream_locked = 1;
12989                                 asoc->stream_locked_on = srcv->sinfo_stream;
12990                         } else {
12991                                 sp->sender_all_done = 1;
12992                                 strm->last_msg_incomplete = 0;
12993                                 asoc->stream_locked = 0;
12994                         }
12995                 } else {
12996                         SCTP_PRINTF("Huh no sp TSNH?\n");
12997                         strm->last_msg_incomplete = 0;
12998                         asoc->stream_locked = 0;
12999                 }
13000                 SCTP_TCB_SEND_UNLOCK(stcb);
13001                 if (uio->uio_resid == 0) {
13002                         got_all_of_the_send = 1;
13003                 }
13004         } else {
13005                 /* We send in a 0, since we do NOT have any locks */
13006                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13007                 top = NULL;
13008                 if (srcv->sinfo_flags & SCTP_EOF) {
13009                         /*
13010                          * This should only happen for Panda for the mbuf
13011                          * send case, which does NOT yet support EEOR mode.
13012                          * Thus, we can just set this flag to do the proper
13013                          * EOF handling.
13014                          */
13015                         got_all_of_the_send = 1;
13016                 }
13017         }
13018         if (error) {
13019                 goto out;
13020         }
13021 dataless_eof:
13022         /* EOF thing ? */
13023         if ((srcv->sinfo_flags & SCTP_EOF) &&
13024             (got_all_of_the_send == 1)) {
13025                 int cnt;
13026
13027                 SCTP_STAT_INCR(sctps_sends_with_eof);
13028                 error = 0;
13029                 if (hold_tcblock == 0) {
13030                         SCTP_TCB_LOCK(stcb);
13031                         hold_tcblock = 1;
13032                 }
13033                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13034                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13035                     TAILQ_EMPTY(&asoc->sent_queue) &&
13036                     (cnt == 0)) {
13037                         if (asoc->locked_on_sending) {
13038                                 goto abort_anyway;
13039                         }
13040                         /* there is nothing queued to send, so I'm done... */
13041                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13042                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13043                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13044                                 struct sctp_nets *netp;
13045
13046                                 if (stcb->asoc.alternate) {
13047                                         netp = stcb->asoc.alternate;
13048                                 } else {
13049                                         netp = stcb->asoc.primary_destination;
13050                                 }
13051                                 /* only send SHUTDOWN the first time through */
13052                                 sctp_send_shutdown(stcb, netp);
13053                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13054                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13055                                 }
13056                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13057                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13058                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13059                                     netp);
13060                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13061                                     asoc->primary_destination);
13062                         }
13063                 } else {
13064                         /*-
13065                          * we still got (or just got) data to send, so set
13066                          * SHUTDOWN_PENDING
13067                          */
13068                         /*-
13069                          * XXX sockets draft says that SCTP_EOF should be
13070                          * sent with no data.  currently, we will allow user
13071                          * data to be sent first and move to
13072                          * SHUTDOWN-PENDING
13073                          */
13074                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13075                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13076                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13077                                 if (hold_tcblock == 0) {
13078                                         SCTP_TCB_LOCK(stcb);
13079                                         hold_tcblock = 1;
13080                                 }
13081                                 if (asoc->locked_on_sending) {
13082                                         /* Locked to send out the data */
13083                                         struct sctp_stream_queue_pending *sp;
13084
13085                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13086                                         if (sp) {
13087                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13088                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13089                                         }
13090                                 }
13091                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13092                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13093                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13094                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13095                         abort_anyway:
13096                                         if (free_cnt_applied) {
13097                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13098                                                 free_cnt_applied = 0;
13099                                         }
13100                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13101                                             NULL, SCTP_SO_LOCKED);
13102                                         /*
13103                                          * now relock the stcb so everything
13104                                          * is sane
13105                                          */
13106                                         hold_tcblock = 0;
13107                                         stcb = NULL;
13108                                         goto out;
13109                                 }
13110                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13111                                     asoc->primary_destination);
13112                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13113                         }
13114                 }
13115         }
13116 skip_out_eof:
13117         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13118                 some_on_control = 1;
13119         }
13120         if (queue_only_for_init) {
13121                 if (hold_tcblock == 0) {
13122                         SCTP_TCB_LOCK(stcb);
13123                         hold_tcblock = 1;
13124                 }
13125                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13126                         /* a collision took us forward? */
13127                         queue_only = 0;
13128                 } else {
13129                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13130                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13131                         queue_only = 1;
13132                 }
13133         }
13134         if ((net->flight_size > net->cwnd) &&
13135             (stcb->asoc.sctp_cmt_on_off == 0)) {
13136                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13137                 queue_only = 1;
13138         } else if (asoc->ifp_had_enobuf) {
13139                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13140                 if (net->flight_size > (2 * net->mtu)) {
13141                         queue_only = 1;
13142                 }
13143                 asoc->ifp_had_enobuf = 0;
13144         }
13145         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13146             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13147         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13148             (stcb->asoc.total_flight > 0) &&
13149             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13150             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13151                 /*-
13152                  * Ok, Nagle is set on and we have data outstanding.
13153                  * Don't send anything and let SACKs drive out the
13154                  * data unless wen have a "full" segment to send.
13155                  */
13156                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13157                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13158                 }
13159                 SCTP_STAT_INCR(sctps_naglequeued);
13160                 nagle_applies = 1;
13161         } else {
13162                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13163                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13164                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13165                 }
13166                 SCTP_STAT_INCR(sctps_naglesent);
13167                 nagle_applies = 0;
13168         }
13169         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13170                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13171                     nagle_applies, un_sent);
13172                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13173                     stcb->asoc.total_flight,
13174                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13175         }
13176         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13177                 /* we can attempt to send too. */
13178                 if (hold_tcblock == 0) {
13179                         /*
13180                          * If there is activity recv'ing sacks no need to
13181                          * send
13182                          */
13183                         if (SCTP_TCB_TRYLOCK(stcb)) {
13184                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13185                                 hold_tcblock = 1;
13186                         }
13187                 } else {
13188                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13189                 }
13190         } else if ((queue_only == 0) &&
13191                     (stcb->asoc.peers_rwnd == 0) &&
13192             (stcb->asoc.total_flight == 0)) {
13193                 /* We get to have a probe outstanding */
13194                 if (hold_tcblock == 0) {
13195                         hold_tcblock = 1;
13196                         SCTP_TCB_LOCK(stcb);
13197                 }
13198                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13199         } else if (some_on_control) {
13200                 int num_out, reason, frag_point;
13201
13202                 /* Here we do control only */
13203                 if (hold_tcblock == 0) {
13204                         hold_tcblock = 1;
13205                         SCTP_TCB_LOCK(stcb);
13206                 }
13207                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13208                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13209                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13210         }
13211         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13212             queue_only, stcb->asoc.peers_rwnd, un_sent,
13213             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13214             stcb->asoc.total_output_queue_size, error);
13215
13216 out:
13217 out_unlocked:
13218
13219         if (local_soresv && stcb) {
13220                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13221         }
13222         if (create_lock_applied) {
13223                 SCTP_ASOC_CREATE_UNLOCK(inp);
13224         }
13225         if ((stcb) && hold_tcblock) {
13226                 SCTP_TCB_UNLOCK(stcb);
13227         }
13228         if (stcb && free_cnt_applied) {
13229                 atomic_add_int(&stcb->asoc.refcnt, -1);
13230         }
13231 #ifdef INVARIANTS
13232         if (stcb) {
13233                 if (mtx_owned(&stcb->tcb_mtx)) {
13234                         panic("Leaving with tcb mtx owned?");
13235                 }
13236                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13237                         panic("Leaving with tcb send mtx owned?");
13238                 }
13239         }
13240 #endif
13241 #ifdef INVARIANTS
13242         if (inp) {
13243                 sctp_validate_no_locks(inp);
13244         } else {
13245                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13246         }
13247 #endif
13248         if (top) {
13249                 sctp_m_freem(top);
13250         }
13251         if (control) {
13252                 sctp_m_freem(control);
13253         }
13254         return (error);
13255 }
13256
13257
13258 /*
13259  * generate an AUTHentication chunk, if required
13260  */
13261 struct mbuf *
13262 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13263     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13264     struct sctp_tcb *stcb, uint8_t chunk)
13265 {
13266         struct mbuf *m_auth;
13267         struct sctp_auth_chunk *auth;
13268         int chunk_len;
13269         struct mbuf *cn;
13270
13271         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13272             (stcb == NULL))
13273                 return (m);
13274
13275         /* sysctl disabled auth? */
13276         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13277                 return (m);
13278
13279         /* peer doesn't do auth... */
13280         if (!stcb->asoc.peer_supports_auth) {
13281                 return (m);
13282         }
13283         /* does the requested chunk require auth? */
13284         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13285                 return (m);
13286         }
13287         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13288         if (m_auth == NULL) {
13289                 /* no mbuf's */
13290                 return (m);
13291         }
13292         /* reserve some space if this will be the first mbuf */
13293         if (m == NULL)
13294                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13295         /* fill in the AUTH chunk details */
13296         auth = mtod(m_auth, struct sctp_auth_chunk *);
13297         bzero(auth, sizeof(*auth));
13298         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13299         auth->ch.chunk_flags = 0;
13300         chunk_len = sizeof(*auth) +
13301             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13302         auth->ch.chunk_length = htons(chunk_len);
13303         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13304         /* key id and hmac digest will be computed and filled in upon send */
13305
13306         /* save the offset where the auth was inserted into the chain */
13307         *offset = 0;
13308         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13309                 *offset += SCTP_BUF_LEN(cn);
13310         }
13311
13312         /* update length and return pointer to the auth chunk */
13313         SCTP_BUF_LEN(m_auth) = chunk_len;
13314         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13315         if (auth_ret != NULL)
13316                 *auth_ret = auth;
13317
13318         return (m);
13319 }
13320
13321 #ifdef INET6
13322 int
13323 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13324 {
13325         struct nd_prefix *pfx = NULL;
13326         struct nd_pfxrouter *pfxrtr = NULL;
13327         struct sockaddr_in6 gw6;
13328
13329         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13330                 return (0);
13331
13332         /* get prefix entry of address */
13333         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13334                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13335                         continue;
13336                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13337                     &src6->sin6_addr, &pfx->ndpr_mask))
13338                         break;
13339         }
13340         /* no prefix entry in the prefix list */
13341         if (pfx == NULL) {
13342                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13343                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13344                 return (0);
13345         }
13346         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13347         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13348
13349         /* search installed gateway from prefix entry */
13350         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13351                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13352                 gw6.sin6_family = AF_INET6;
13353                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13354                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13355                     sizeof(struct in6_addr));
13356                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13357                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13358                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13359                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13360                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13361                     ro->ro_rt->rt_gateway)) {
13362                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13363                         return (1);
13364                 }
13365         }
13366         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13367         return (0);
13368 }
13369
13370 #endif
13371
13372 int
13373 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13374 {
13375 #ifdef INET
13376         struct sockaddr_in *sin, *mask;
13377         struct ifaddr *ifa;
13378         struct in_addr srcnetaddr, gwnetaddr;
13379
13380         if (ro == NULL || ro->ro_rt == NULL ||
13381             sifa->address.sa.sa_family != AF_INET) {
13382                 return (0);
13383         }
13384         ifa = (struct ifaddr *)sifa->ifa;
13385         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13386         sin = (struct sockaddr_in *)&sifa->address.sin;
13387         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13388         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13389         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13390         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13391
13392         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13393         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13394         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13395         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13396         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13397         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13398                 return (1);
13399         }
13400 #endif
13401         return (0);
13402 }