sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #include <netinet/udp.h>
  54 #include <netinet/udp_var.h>
  55 #include <machine/in_cksum.h>
  56
  57
  58
  59 #define SCTP_MAX_GAPS_INARRAY 4
  60 struct sack_track {
  61         uint8_t right_edge;     /* mergable on the right edge */
  62         uint8_t left_edge;      /* mergable on the left edge */
  63         uint8_t num_entries;
  64         uint8_t spare;
  65         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  66 };
  67
  68 struct sack_track sack_array[256] = {
  69         {0, 0, 0, 0,            /* 0x00 */
  70                 {{0, 0},
  71                 {0, 0},
  72                 {0, 0},
  73                 {0, 0}
  74                 }
  75         },
  76         {1, 0, 1, 0,            /* 0x01 */
  77                 {{0, 0},
  78                 {0, 0},
  79                 {0, 0},
  80                 {0, 0}
  81                 }
  82         },
  83         {0, 0, 1, 0,            /* 0x02 */
  84                 {{1, 1},
  85                 {0, 0},
  86                 {0, 0},
  87                 {0, 0}
  88                 }
  89         },
  90         {1, 0, 1, 0,            /* 0x03 */
  91                 {{0, 1},
  92                 {0, 0},
  93                 {0, 0},
  94                 {0, 0}
  95                 }
  96         },
  97         {0, 0, 1, 0,            /* 0x04 */
  98                 {{2, 2},
  99                 {0, 0},
 100                 {0, 0},
 101                 {0, 0}
 102                 }
 103         },
 104         {1, 0, 2, 0,            /* 0x05 */
 105                 {{0, 0},
 106                 {2, 2},
 107                 {0, 0},
 108                 {0, 0}
 109                 }
 110         },
 111         {0, 0, 1, 0,            /* 0x06 */
 112                 {{1, 2},
 113                 {0, 0},
 114                 {0, 0},
 115                 {0, 0}
 116                 }
 117         },
 118         {1, 0, 1, 0,            /* 0x07 */
 119                 {{0, 2},
 120                 {0, 0},
 121                 {0, 0},
 122                 {0, 0}
 123                 }
 124         },
 125         {0, 0, 1, 0,            /* 0x08 */
 126                 {{3, 3},
 127                 {0, 0},
 128                 {0, 0},
 129                 {0, 0}
 130                 }
 131         },
 132         {1, 0, 2, 0,            /* 0x09 */
 133                 {{0, 0},
 134                 {3, 3},
 135                 {0, 0},
 136                 {0, 0}
 137                 }
 138         },
 139         {0, 0, 2, 0,            /* 0x0a */
 140                 {{1, 1},
 141                 {3, 3},
 142                 {0, 0},
 143                 {0, 0}
 144                 }
 145         },
 146         {1, 0, 2, 0,            /* 0x0b */
 147                 {{0, 1},
 148                 {3, 3},
 149                 {0, 0},
 150                 {0, 0}
 151                 }
 152         },
 153         {0, 0, 1, 0,            /* 0x0c */
 154                 {{2, 3},
 155                 {0, 0},
 156                 {0, 0},
 157                 {0, 0}
 158                 }
 159         },
 160         {1, 0, 2, 0,            /* 0x0d */
 161                 {{0, 0},
 162                 {2, 3},
 163                 {0, 0},
 164                 {0, 0}
 165                 }
 166         },
 167         {0, 0, 1, 0,            /* 0x0e */
 168                 {{1, 3},
 169                 {0, 0},
 170                 {0, 0},
 171                 {0, 0}
 172                 }
 173         },
 174         {1, 0, 1, 0,            /* 0x0f */
 175                 {{0, 3},
 176                 {0, 0},
 177                 {0, 0},
 178                 {0, 0}
 179                 }
 180         },
 181         {0, 0, 1, 0,            /* 0x10 */
 182                 {{4, 4},
 183                 {0, 0},
 184                 {0, 0},
 185                 {0, 0}
 186                 }
 187         },
 188         {1, 0, 2, 0,            /* 0x11 */
 189                 {{0, 0},
 190                 {4, 4},
 191                 {0, 0},
 192                 {0, 0}
 193                 }
 194         },
 195         {0, 0, 2, 0,            /* 0x12 */
 196                 {{1, 1},
 197                 {4, 4},
 198                 {0, 0},
 199                 {0, 0}
 200                 }
 201         },
 202         {1, 0, 2, 0,            /* 0x13 */
 203                 {{0, 1},
 204                 {4, 4},
 205                 {0, 0},
 206                 {0, 0}
 207                 }
 208         },
 209         {0, 0, 2, 0,            /* 0x14 */
 210                 {{2, 2},
 211                 {4, 4},
 212                 {0, 0},
 213                 {0, 0}
 214                 }
 215         },
 216         {1, 0, 3, 0,            /* 0x15 */
 217                 {{0, 0},
 218                 {2, 2},
 219                 {4, 4},
 220                 {0, 0}
 221                 }
 222         },
 223         {0, 0, 2, 0,            /* 0x16 */
 224                 {{1, 2},
 225                 {4, 4},
 226                 {0, 0},
 227                 {0, 0}
 228                 }
 229         },
 230         {1, 0, 2, 0,            /* 0x17 */
 231                 {{0, 2},
 232                 {4, 4},
 233                 {0, 0},
 234                 {0, 0}
 235                 }
 236         },
 237         {0, 0, 1, 0,            /* 0x18 */
 238                 {{3, 4},
 239                 {0, 0},
 240                 {0, 0},
 241                 {0, 0}
 242                 }
 243         },
 244         {1, 0, 2, 0,            /* 0x19 */
 245                 {{0, 0},
 246                 {3, 4},
 247                 {0, 0},
 248                 {0, 0}
 249                 }
 250         },
 251         {0, 0, 2, 0,            /* 0x1a */
 252                 {{1, 1},
 253                 {3, 4},
 254                 {0, 0},
 255                 {0, 0}
 256                 }
 257         },
 258         {1, 0, 2, 0,            /* 0x1b */
 259                 {{0, 1},
 260                 {3, 4},
 261                 {0, 0},
 262                 {0, 0}
 263                 }
 264         },
 265         {0, 0, 1, 0,            /* 0x1c */
 266                 {{2, 4},
 267                 {0, 0},
 268                 {0, 0},
 269                 {0, 0}
 270                 }
 271         },
 272         {1, 0, 2, 0,            /* 0x1d */
 273                 {{0, 0},
 274                 {2, 4},
 275                 {0, 0},
 276                 {0, 0}
 277                 }
 278         },
 279         {0, 0, 1, 0,            /* 0x1e */
 280                 {{1, 4},
 281                 {0, 0},
 282                 {0, 0},
 283                 {0, 0}
 284                 }
 285         },
 286         {1, 0, 1, 0,            /* 0x1f */
 287                 {{0, 4},
 288                 {0, 0},
 289                 {0, 0},
 290                 {0, 0}
 291                 }
 292         },
 293         {0, 0, 1, 0,            /* 0x20 */
 294                 {{5, 5},
 295                 {0, 0},
 296                 {0, 0},
 297                 {0, 0}
 298                 }
 299         },
 300         {1, 0, 2, 0,            /* 0x21 */
 301                 {{0, 0},
 302                 {5, 5},
 303                 {0, 0},
 304                 {0, 0}
 305                 }
 306         },
 307         {0, 0, 2, 0,            /* 0x22 */
 308                 {{1, 1},
 309                 {5, 5},
 310                 {0, 0},
 311                 {0, 0}
 312                 }
 313         },
 314         {1, 0, 2, 0,            /* 0x23 */
 315                 {{0, 1},
 316                 {5, 5},
 317                 {0, 0},
 318                 {0, 0}
 319                 }
 320         },
 321         {0, 0, 2, 0,            /* 0x24 */
 322                 {{2, 2},
 323                 {5, 5},
 324                 {0, 0},
 325                 {0, 0}
 326                 }
 327         },
 328         {1, 0, 3, 0,            /* 0x25 */
 329                 {{0, 0},
 330                 {2, 2},
 331                 {5, 5},
 332                 {0, 0}
 333                 }
 334         },
 335         {0, 0, 2, 0,            /* 0x26 */
 336                 {{1, 2},
 337                 {5, 5},
 338                 {0, 0},
 339                 {0, 0}
 340                 }
 341         },
 342         {1, 0, 2, 0,            /* 0x27 */
 343                 {{0, 2},
 344                 {5, 5},
 345                 {0, 0},
 346                 {0, 0}
 347                 }
 348         },
 349         {0, 0, 2, 0,            /* 0x28 */
 350                 {{3, 3},
 351                 {5, 5},
 352                 {0, 0},
 353                 {0, 0}
 354                 }
 355         },
 356         {1, 0, 3, 0,            /* 0x29 */
 357                 {{0, 0},
 358                 {3, 3},
 359                 {5, 5},
 360                 {0, 0}
 361                 }
 362         },
 363         {0, 0, 3, 0,            /* 0x2a */
 364                 {{1, 1},
 365                 {3, 3},
 366                 {5, 5},
 367                 {0, 0}
 368                 }
 369         },
 370         {1, 0, 3, 0,            /* 0x2b */
 371                 {{0, 1},
 372                 {3, 3},
 373                 {5, 5},
 374                 {0, 0}
 375                 }
 376         },
 377         {0, 0, 2, 0,            /* 0x2c */
 378                 {{2, 3},
 379                 {5, 5},
 380                 {0, 0},
 381                 {0, 0}
 382                 }
 383         },
 384         {1, 0, 3, 0,            /* 0x2d */
 385                 {{0, 0},
 386                 {2, 3},
 387                 {5, 5},
 388                 {0, 0}
 389                 }
 390         },
 391         {0, 0, 2, 0,            /* 0x2e */
 392                 {{1, 3},
 393                 {5, 5},
 394                 {0, 0},
 395                 {0, 0}
 396                 }
 397         },
 398         {1, 0, 2, 0,            /* 0x2f */
 399                 {{0, 3},
 400                 {5, 5},
 401                 {0, 0},
 402                 {0, 0}
 403                 }
 404         },
 405         {0, 0, 1, 0,            /* 0x30 */
 406                 {{4, 5},
 407                 {0, 0},
 408                 {0, 0},
 409                 {0, 0}
 410                 }
 411         },
 412         {1, 0, 2, 0,            /* 0x31 */
 413                 {{0, 0},
 414                 {4, 5},
 415                 {0, 0},
 416                 {0, 0}
 417                 }
 418         },
 419         {0, 0, 2, 0,            /* 0x32 */
 420                 {{1, 1},
 421                 {4, 5},
 422                 {0, 0},
 423                 {0, 0}
 424                 }
 425         },
 426         {1, 0, 2, 0,            /* 0x33 */
 427                 {{0, 1},
 428                 {4, 5},
 429                 {0, 0},
 430                 {0, 0}
 431                 }
 432         },
 433         {0, 0, 2, 0,            /* 0x34 */
 434                 {{2, 2},
 435                 {4, 5},
 436                 {0, 0},
 437                 {0, 0}
 438                 }
 439         },
 440         {1, 0, 3, 0,            /* 0x35 */
 441                 {{0, 0},
 442                 {2, 2},
 443                 {4, 5},
 444                 {0, 0}
 445                 }
 446         },
 447         {0, 0, 2, 0,            /* 0x36 */
 448                 {{1, 2},
 449                 {4, 5},
 450                 {0, 0},
 451                 {0, 0}
 452                 }
 453         },
 454         {1, 0, 2, 0,            /* 0x37 */
 455                 {{0, 2},
 456                 {4, 5},
 457                 {0, 0},
 458                 {0, 0}
 459                 }
 460         },
 461         {0, 0, 1, 0,            /* 0x38 */
 462                 {{3, 5},
 463                 {0, 0},
 464                 {0, 0},
 465                 {0, 0}
 466                 }
 467         },
 468         {1, 0, 2, 0,            /* 0x39 */
 469                 {{0, 0},
 470                 {3, 5},
 471                 {0, 0},
 472                 {0, 0}
 473                 }
 474         },
 475         {0, 0, 2, 0,            /* 0x3a */
 476                 {{1, 1},
 477                 {3, 5},
 478                 {0, 0},
 479                 {0, 0}
 480                 }
 481         },
 482         {1, 0, 2, 0,            /* 0x3b */
 483                 {{0, 1},
 484                 {3, 5},
 485                 {0, 0},
 486                 {0, 0}
 487                 }
 488         },
 489         {0, 0, 1, 0,            /* 0x3c */
 490                 {{2, 5},
 491                 {0, 0},
 492                 {0, 0},
 493                 {0, 0}
 494                 }
 495         },
 496         {1, 0, 2, 0,            /* 0x3d */
 497                 {{0, 0},
 498                 {2, 5},
 499                 {0, 0},
 500                 {0, 0}
 501                 }
 502         },
 503         {0, 0, 1, 0,            /* 0x3e */
 504                 {{1, 5},
 505                 {0, 0},
 506                 {0, 0},
 507                 {0, 0}
 508                 }
 509         },
 510         {1, 0, 1, 0,            /* 0x3f */
 511                 {{0, 5},
 512                 {0, 0},
 513                 {0, 0},
 514                 {0, 0}
 515                 }
 516         },
 517         {0, 0, 1, 0,            /* 0x40 */
 518                 {{6, 6},
 519                 {0, 0},
 520                 {0, 0},
 521                 {0, 0}
 522                 }
 523         },
 524         {1, 0, 2, 0,            /* 0x41 */
 525                 {{0, 0},
 526                 {6, 6},
 527                 {0, 0},
 528                 {0, 0}
 529                 }
 530         },
 531         {0, 0, 2, 0,            /* 0x42 */
 532                 {{1, 1},
 533                 {6, 6},
 534                 {0, 0},
 535                 {0, 0}
 536                 }
 537         },
 538         {1, 0, 2, 0,            /* 0x43 */
 539                 {{0, 1},
 540                 {6, 6},
 541                 {0, 0},
 542                 {0, 0}
 543                 }
 544         },
 545         {0, 0, 2, 0,            /* 0x44 */
 546                 {{2, 2},
 547                 {6, 6},
 548                 {0, 0},
 549                 {0, 0}
 550                 }
 551         },
 552         {1, 0, 3, 0,            /* 0x45 */
 553                 {{0, 0},
 554                 {2, 2},
 555                 {6, 6},
 556                 {0, 0}
 557                 }
 558         },
 559         {0, 0, 2, 0,            /* 0x46 */
 560                 {{1, 2},
 561                 {6, 6},
 562                 {0, 0},
 563                 {0, 0}
 564                 }
 565         },
 566         {1, 0, 2, 0,            /* 0x47 */
 567                 {{0, 2},
 568                 {6, 6},
 569                 {0, 0},
 570                 {0, 0}
 571                 }
 572         },
 573         {0, 0, 2, 0,            /* 0x48 */
 574                 {{3, 3},
 575                 {6, 6},
 576                 {0, 0},
 577                 {0, 0}
 578                 }
 579         },
 580         {1, 0, 3, 0,            /* 0x49 */
 581                 {{0, 0},
 582                 {3, 3},
 583                 {6, 6},
 584                 {0, 0}
 585                 }
 586         },
 587         {0, 0, 3, 0,            /* 0x4a */
 588                 {{1, 1},
 589                 {3, 3},
 590                 {6, 6},
 591                 {0, 0}
 592                 }
 593         },
 594         {1, 0, 3, 0,            /* 0x4b */
 595                 {{0, 1},
 596                 {3, 3},
 597                 {6, 6},
 598                 {0, 0}
 599                 }
 600         },
 601         {0, 0, 2, 0,            /* 0x4c */
 602                 {{2, 3},
 603                 {6, 6},
 604                 {0, 0},
 605                 {0, 0}
 606                 }
 607         },
 608         {1, 0, 3, 0,            /* 0x4d */
 609                 {{0, 0},
 610                 {2, 3},
 611                 {6, 6},
 612                 {0, 0}
 613                 }
 614         },
 615         {0, 0, 2, 0,            /* 0x4e */
 616                 {{1, 3},
 617                 {6, 6},
 618                 {0, 0},
 619                 {0, 0}
 620                 }
 621         },
 622         {1, 0, 2, 0,            /* 0x4f */
 623                 {{0, 3},
 624                 {6, 6},
 625                 {0, 0},
 626                 {0, 0}
 627                 }
 628         },
 629         {0, 0, 2, 0,            /* 0x50 */
 630                 {{4, 4},
 631                 {6, 6},
 632                 {0, 0},
 633                 {0, 0}
 634                 }
 635         },
 636         {1, 0, 3, 0,            /* 0x51 */
 637                 {{0, 0},
 638                 {4, 4},
 639                 {6, 6},
 640                 {0, 0}
 641                 }
 642         },
 643         {0, 0, 3, 0,            /* 0x52 */
 644                 {{1, 1},
 645                 {4, 4},
 646                 {6, 6},
 647                 {0, 0}
 648                 }
 649         },
 650         {1, 0, 3, 0,            /* 0x53 */
 651                 {{0, 1},
 652                 {4, 4},
 653                 {6, 6},
 654                 {0, 0}
 655                 }
 656         },
 657         {0, 0, 3, 0,            /* 0x54 */
 658                 {{2, 2},
 659                 {4, 4},
 660                 {6, 6},
 661                 {0, 0}
 662                 }
 663         },
 664         {1, 0, 4, 0,            /* 0x55 */
 665                 {{0, 0},
 666                 {2, 2},
 667                 {4, 4},
 668                 {6, 6}
 669                 }
 670         },
 671         {0, 0, 3, 0,            /* 0x56 */
 672                 {{1, 2},
 673                 {4, 4},
 674                 {6, 6},
 675                 {0, 0}
 676                 }
 677         },
 678         {1, 0, 3, 0,            /* 0x57 */
 679                 {{0, 2},
 680                 {4, 4},
 681                 {6, 6},
 682                 {0, 0}
 683                 }
 684         },
 685         {0, 0, 2, 0,            /* 0x58 */
 686                 {{3, 4},
 687                 {6, 6},
 688                 {0, 0},
 689                 {0, 0}
 690                 }
 691         },
 692         {1, 0, 3, 0,            /* 0x59 */
 693                 {{0, 0},
 694                 {3, 4},
 695                 {6, 6},
 696                 {0, 0}
 697                 }
 698         },
 699         {0, 0, 3, 0,            /* 0x5a */
 700                 {{1, 1},
 701                 {3, 4},
 702                 {6, 6},
 703                 {0, 0}
 704                 }
 705         },
 706         {1, 0, 3, 0,            /* 0x5b */
 707                 {{0, 1},
 708                 {3, 4},
 709                 {6, 6},
 710                 {0, 0}
 711                 }
 712         },
 713         {0, 0, 2, 0,            /* 0x5c */
 714                 {{2, 4},
 715                 {6, 6},
 716                 {0, 0},
 717                 {0, 0}
 718                 }
 719         },
 720         {1, 0, 3, 0,            /* 0x5d */
 721                 {{0, 0},
 722                 {2, 4},
 723                 {6, 6},
 724                 {0, 0}
 725                 }
 726         },
 727         {0, 0, 2, 0,            /* 0x5e */
 728                 {{1, 4},
 729                 {6, 6},
 730                 {0, 0},
 731                 {0, 0}
 732                 }
 733         },
 734         {1, 0, 2, 0,            /* 0x5f */
 735                 {{0, 4},
 736                 {6, 6},
 737                 {0, 0},
 738                 {0, 0}
 739                 }
 740         },
 741         {0, 0, 1, 0,            /* 0x60 */
 742                 {{5, 6},
 743                 {0, 0},
 744                 {0, 0},
 745                 {0, 0}
 746                 }
 747         },
 748         {1, 0, 2, 0,            /* 0x61 */
 749                 {{0, 0},
 750                 {5, 6},
 751                 {0, 0},
 752                 {0, 0}
 753                 }
 754         },
 755         {0, 0, 2, 0,            /* 0x62 */
 756                 {{1, 1},
 757                 {5, 6},
 758                 {0, 0},
 759                 {0, 0}
 760                 }
 761         },
 762         {1, 0, 2, 0,            /* 0x63 */
 763                 {{0, 1},
 764                 {5, 6},
 765                 {0, 0},
 766                 {0, 0}
 767                 }
 768         },
 769         {0, 0, 2, 0,            /* 0x64 */
 770                 {{2, 2},
 771                 {5, 6},
 772                 {0, 0},
 773                 {0, 0}
 774                 }
 775         },
 776         {1, 0, 3, 0,            /* 0x65 */
 777                 {{0, 0},
 778                 {2, 2},
 779                 {5, 6},
 780                 {0, 0}
 781                 }
 782         },
 783         {0, 0, 2, 0,            /* 0x66 */
 784                 {{1, 2},
 785                 {5, 6},
 786                 {0, 0},
 787                 {0, 0}
 788                 }
 789         },
 790         {1, 0, 2, 0,            /* 0x67 */
 791                 {{0, 2},
 792                 {5, 6},
 793                 {0, 0},
 794                 {0, 0}
 795                 }
 796         },
 797         {0, 0, 2, 0,            /* 0x68 */
 798                 {{3, 3},
 799                 {5, 6},
 800                 {0, 0},
 801                 {0, 0}
 802                 }
 803         },
 804         {1, 0, 3, 0,            /* 0x69 */
 805                 {{0, 0},
 806                 {3, 3},
 807                 {5, 6},
 808                 {0, 0}
 809                 }
 810         },
 811         {0, 0, 3, 0,            /* 0x6a */
 812                 {{1, 1},
 813                 {3, 3},
 814                 {5, 6},
 815                 {0, 0}
 816                 }
 817         },
 818         {1, 0, 3, 0,            /* 0x6b */
 819                 {{0, 1},
 820                 {3, 3},
 821                 {5, 6},
 822                 {0, 0}
 823                 }
 824         },
 825         {0, 0, 2, 0,            /* 0x6c */
 826                 {{2, 3},
 827                 {5, 6},
 828                 {0, 0},
 829                 {0, 0}
 830                 }
 831         },
 832         {1, 0, 3, 0,            /* 0x6d */
 833                 {{0, 0},
 834                 {2, 3},
 835                 {5, 6},
 836                 {0, 0}
 837                 }
 838         },
 839         {0, 0, 2, 0,            /* 0x6e */
 840                 {{1, 3},
 841                 {5, 6},
 842                 {0, 0},
 843                 {0, 0}
 844                 }
 845         },
 846         {1, 0, 2, 0,            /* 0x6f */
 847                 {{0, 3},
 848                 {5, 6},
 849                 {0, 0},
 850                 {0, 0}
 851                 }
 852         },
 853         {0, 0, 1, 0,            /* 0x70 */
 854                 {{4, 6},
 855                 {0, 0},
 856                 {0, 0},
 857                 {0, 0}
 858                 }
 859         },
 860         {1, 0, 2, 0,            /* 0x71 */
 861                 {{0, 0},
 862                 {4, 6},
 863                 {0, 0},
 864                 {0, 0}
 865                 }
 866         },
 867         {0, 0, 2, 0,            /* 0x72 */
 868                 {{1, 1},
 869                 {4, 6},
 870                 {0, 0},
 871                 {0, 0}
 872                 }
 873         },
 874         {1, 0, 2, 0,            /* 0x73 */
 875                 {{0, 1},
 876                 {4, 6},
 877                 {0, 0},
 878                 {0, 0}
 879                 }
 880         },
 881         {0, 0, 2, 0,            /* 0x74 */
 882                 {{2, 2},
 883                 {4, 6},
 884                 {0, 0},
 885                 {0, 0}
 886                 }
 887         },
 888         {1, 0, 3, 0,            /* 0x75 */
 889                 {{0, 0},
 890                 {2, 2},
 891                 {4, 6},
 892                 {0, 0}
 893                 }
 894         },
 895         {0, 0, 2, 0,            /* 0x76 */
 896                 {{1, 2},
 897                 {4, 6},
 898                 {0, 0},
 899                 {0, 0}
 900                 }
 901         },
 902         {1, 0, 2, 0,            /* 0x77 */
 903                 {{0, 2},
 904                 {4, 6},
 905                 {0, 0},
 906                 {0, 0}
 907                 }
 908         },
 909         {0, 0, 1, 0,            /* 0x78 */
 910                 {{3, 6},
 911                 {0, 0},
 912                 {0, 0},
 913                 {0, 0}
 914                 }
 915         },
 916         {1, 0, 2, 0,            /* 0x79 */
 917                 {{0, 0},
 918                 {3, 6},
 919                 {0, 0},
 920                 {0, 0}
 921                 }
 922         },
 923         {0, 0, 2, 0,            /* 0x7a */
 924                 {{1, 1},
 925                 {3, 6},
 926                 {0, 0},
 927                 {0, 0}
 928                 }
 929         },
 930         {1, 0, 2, 0,            /* 0x7b */
 931                 {{0, 1},
 932                 {3, 6},
 933                 {0, 0},
 934                 {0, 0}
 935                 }
 936         },
 937         {0, 0, 1, 0,            /* 0x7c */
 938                 {{2, 6},
 939                 {0, 0},
 940                 {0, 0},
 941                 {0, 0}
 942                 }
 943         },
 944         {1, 0, 2, 0,            /* 0x7d */
 945                 {{0, 0},
 946                 {2, 6},
 947                 {0, 0},
 948                 {0, 0}
 949                 }
 950         },
 951         {0, 0, 1, 0,            /* 0x7e */
 952                 {{1, 6},
 953                 {0, 0},
 954                 {0, 0},
 955                 {0, 0}
 956                 }
 957         },
 958         {1, 0, 1, 0,            /* 0x7f */
 959                 {{0, 6},
 960                 {0, 0},
 961                 {0, 0},
 962                 {0, 0}
 963                 }
 964         },
 965         {0, 1, 1, 0,            /* 0x80 */
 966                 {{7, 7},
 967                 {0, 0},
 968                 {0, 0},
 969                 {0, 0}
 970                 }
 971         },
 972         {1, 1, 2, 0,            /* 0x81 */
 973                 {{0, 0},
 974                 {7, 7},
 975                 {0, 0},
 976                 {0, 0}
 977                 }
 978         },
 979         {0, 1, 2, 0,            /* 0x82 */
 980                 {{1, 1},
 981                 {7, 7},
 982                 {0, 0},
 983                 {0, 0}
 984                 }
 985         },
 986         {1, 1, 2, 0,            /* 0x83 */
 987                 {{0, 1},
 988                 {7, 7},
 989                 {0, 0},
 990                 {0, 0}
 991                 }
 992         },
 993         {0, 1, 2, 0,            /* 0x84 */
 994                 {{2, 2},
 995                 {7, 7},
 996                 {0, 0},
 997                 {0, 0}
 998                 }
 999         },
1000         {1, 1, 3, 0,            /* 0x85 */
1001                 {{0, 0},
1002                 {2, 2},
1003                 {7, 7},
1004                 {0, 0}
1005                 }
1006         },
1007         {0, 1, 2, 0,            /* 0x86 */
1008                 {{1, 2},
1009                 {7, 7},
1010                 {0, 0},
1011                 {0, 0}
1012                 }
1013         },
1014         {1, 1, 2, 0,            /* 0x87 */
1015                 {{0, 2},
1016                 {7, 7},
1017                 {0, 0},
1018                 {0, 0}
1019                 }
1020         },
1021         {0, 1, 2, 0,            /* 0x88 */
1022                 {{3, 3},
1023                 {7, 7},
1024                 {0, 0},
1025                 {0, 0}
1026                 }
1027         },
1028         {1, 1, 3, 0,            /* 0x89 */
1029                 {{0, 0},
1030                 {3, 3},
1031                 {7, 7},
1032                 {0, 0}
1033                 }
1034         },
1035         {0, 1, 3, 0,            /* 0x8a */
1036                 {{1, 1},
1037                 {3, 3},
1038                 {7, 7},
1039                 {0, 0}
1040                 }
1041         },
1042         {1, 1, 3, 0,            /* 0x8b */
1043                 {{0, 1},
1044                 {3, 3},
1045                 {7, 7},
1046                 {0, 0}
1047                 }
1048         },
1049         {0, 1, 2, 0,            /* 0x8c */
1050                 {{2, 3},
1051                 {7, 7},
1052                 {0, 0},
1053                 {0, 0}
1054                 }
1055         },
1056         {1, 1, 3, 0,            /* 0x8d */
1057                 {{0, 0},
1058                 {2, 3},
1059                 {7, 7},
1060                 {0, 0}
1061                 }
1062         },
1063         {0, 1, 2, 0,            /* 0x8e */
1064                 {{1, 3},
1065                 {7, 7},
1066                 {0, 0},
1067                 {0, 0}
1068                 }
1069         },
1070         {1, 1, 2, 0,            /* 0x8f */
1071                 {{0, 3},
1072                 {7, 7},
1073                 {0, 0},
1074                 {0, 0}
1075                 }
1076         },
1077         {0, 1, 2, 0,            /* 0x90 */
1078                 {{4, 4},
1079                 {7, 7},
1080                 {0, 0},
1081                 {0, 0}
1082                 }
1083         },
1084         {1, 1, 3, 0,            /* 0x91 */
1085                 {{0, 0},
1086                 {4, 4},
1087                 {7, 7},
1088                 {0, 0}
1089                 }
1090         },
1091         {0, 1, 3, 0,            /* 0x92 */
1092                 {{1, 1},
1093                 {4, 4},
1094                 {7, 7},
1095                 {0, 0}
1096                 }
1097         },
1098         {1, 1, 3, 0,            /* 0x93 */
1099                 {{0, 1},
1100                 {4, 4},
1101                 {7, 7},
1102                 {0, 0}
1103                 }
1104         },
1105         {0, 1, 3, 0,            /* 0x94 */
1106                 {{2, 2},
1107                 {4, 4},
1108                 {7, 7},
1109                 {0, 0}
1110                 }
1111         },
1112         {1, 1, 4, 0,            /* 0x95 */
1113                 {{0, 0},
1114                 {2, 2},
1115                 {4, 4},
1116                 {7, 7}
1117                 }
1118         },
1119         {0, 1, 3, 0,            /* 0x96 */
1120                 {{1, 2},
1121                 {4, 4},
1122                 {7, 7},
1123                 {0, 0}
1124                 }
1125         },
1126         {1, 1, 3, 0,            /* 0x97 */
1127                 {{0, 2},
1128                 {4, 4},
1129                 {7, 7},
1130                 {0, 0}
1131                 }
1132         },
1133         {0, 1, 2, 0,            /* 0x98 */
1134                 {{3, 4},
1135                 {7, 7},
1136                 {0, 0},
1137                 {0, 0}
1138                 }
1139         },
1140         {1, 1, 3, 0,            /* 0x99 */
1141                 {{0, 0},
1142                 {3, 4},
1143                 {7, 7},
1144                 {0, 0}
1145                 }
1146         },
1147         {0, 1, 3, 0,            /* 0x9a */
1148                 {{1, 1},
1149                 {3, 4},
1150                 {7, 7},
1151                 {0, 0}
1152                 }
1153         },
1154         {1, 1, 3, 0,            /* 0x9b */
1155                 {{0, 1},
1156                 {3, 4},
1157                 {7, 7},
1158                 {0, 0}
1159                 }
1160         },
1161         {0, 1, 2, 0,            /* 0x9c */
1162                 {{2, 4},
1163                 {7, 7},
1164                 {0, 0},
1165                 {0, 0}
1166                 }
1167         },
1168         {1, 1, 3, 0,            /* 0x9d */
1169                 {{0, 0},
1170                 {2, 4},
1171                 {7, 7},
1172                 {0, 0}
1173                 }
1174         },
1175         {0, 1, 2, 0,            /* 0x9e */
1176                 {{1, 4},
1177                 {7, 7},
1178                 {0, 0},
1179                 {0, 0}
1180                 }
1181         },
1182         {1, 1, 2, 0,            /* 0x9f */
1183                 {{0, 4},
1184                 {7, 7},
1185                 {0, 0},
1186                 {0, 0}
1187                 }
1188         },
1189         {0, 1, 2, 0,            /* 0xa0 */
1190                 {{5, 5},
1191                 {7, 7},
1192                 {0, 0},
1193                 {0, 0}
1194                 }
1195         },
1196         {1, 1, 3, 0,            /* 0xa1 */
1197                 {{0, 0},
1198                 {5, 5},
1199                 {7, 7},
1200                 {0, 0}
1201                 }
1202         },
1203         {0, 1, 3, 0,            /* 0xa2 */
1204                 {{1, 1},
1205                 {5, 5},
1206                 {7, 7},
1207                 {0, 0}
1208                 }
1209         },
1210         {1, 1, 3, 0,            /* 0xa3 */
1211                 {{0, 1},
1212                 {5, 5},
1213                 {7, 7},
1214                 {0, 0}
1215                 }
1216         },
1217         {0, 1, 3, 0,            /* 0xa4 */
1218                 {{2, 2},
1219                 {5, 5},
1220                 {7, 7},
1221                 {0, 0}
1222                 }
1223         },
1224         {1, 1, 4, 0,            /* 0xa5 */
1225                 {{0, 0},
1226                 {2, 2},
1227                 {5, 5},
1228                 {7, 7}
1229                 }
1230         },
1231         {0, 1, 3, 0,            /* 0xa6 */
1232                 {{1, 2},
1233                 {5, 5},
1234                 {7, 7},
1235                 {0, 0}
1236                 }
1237         },
1238         {1, 1, 3, 0,            /* 0xa7 */
1239                 {{0, 2},
1240                 {5, 5},
1241                 {7, 7},
1242                 {0, 0}
1243                 }
1244         },
1245         {0, 1, 3, 0,            /* 0xa8 */
1246                 {{3, 3},
1247                 {5, 5},
1248                 {7, 7},
1249                 {0, 0}
1250                 }
1251         },
1252         {1, 1, 4, 0,            /* 0xa9 */
1253                 {{0, 0},
1254                 {3, 3},
1255                 {5, 5},
1256                 {7, 7}
1257                 }
1258         },
1259         {0, 1, 4, 0,            /* 0xaa */
1260                 {{1, 1},
1261                 {3, 3},
1262                 {5, 5},
1263                 {7, 7}
1264                 }
1265         },
1266         {1, 1, 4, 0,            /* 0xab */
1267                 {{0, 1},
1268                 {3, 3},
1269                 {5, 5},
1270                 {7, 7}
1271                 }
1272         },
1273         {0, 1, 3, 0,            /* 0xac */
1274                 {{2, 3},
1275                 {5, 5},
1276                 {7, 7},
1277                 {0, 0}
1278                 }
1279         },
1280         {1, 1, 4, 0,            /* 0xad */
1281                 {{0, 0},
1282                 {2, 3},
1283                 {5, 5},
1284                 {7, 7}
1285                 }
1286         },
1287         {0, 1, 3, 0,            /* 0xae */
1288                 {{1, 3},
1289                 {5, 5},
1290                 {7, 7},
1291                 {0, 0}
1292                 }
1293         },
1294         {1, 1, 3, 0,            /* 0xaf */
1295                 {{0, 3},
1296                 {5, 5},
1297                 {7, 7},
1298                 {0, 0}
1299                 }
1300         },
1301         {0, 1, 2, 0,            /* 0xb0 */
1302                 {{4, 5},
1303                 {7, 7},
1304                 {0, 0},
1305                 {0, 0}
1306                 }
1307         },
1308         {1, 1, 3, 0,            /* 0xb1 */
1309                 {{0, 0},
1310                 {4, 5},
1311                 {7, 7},
1312                 {0, 0}
1313                 }
1314         },
1315         {0, 1, 3, 0,            /* 0xb2 */
1316                 {{1, 1},
1317                 {4, 5},
1318                 {7, 7},
1319                 {0, 0}
1320                 }
1321         },
1322         {1, 1, 3, 0,            /* 0xb3 */
1323                 {{0, 1},
1324                 {4, 5},
1325                 {7, 7},
1326                 {0, 0}
1327                 }
1328         },
1329         {0, 1, 3, 0,            /* 0xb4 */
1330                 {{2, 2},
1331                 {4, 5},
1332                 {7, 7},
1333                 {0, 0}
1334                 }
1335         },
1336         {1, 1, 4, 0,            /* 0xb5 */
1337                 {{0, 0},
1338                 {2, 2},
1339                 {4, 5},
1340                 {7, 7}
1341                 }
1342         },
1343         {0, 1, 3, 0,            /* 0xb6 */
1344                 {{1, 2},
1345                 {4, 5},
1346                 {7, 7},
1347                 {0, 0}
1348                 }
1349         },
1350         {1, 1, 3, 0,            /* 0xb7 */
1351                 {{0, 2},
1352                 {4, 5},
1353                 {7, 7},
1354                 {0, 0}
1355                 }
1356         },
1357         {0, 1, 2, 0,            /* 0xb8 */
1358                 {{3, 5},
1359                 {7, 7},
1360                 {0, 0},
1361                 {0, 0}
1362                 }
1363         },
1364         {1, 1, 3, 0,            /* 0xb9 */
1365                 {{0, 0},
1366                 {3, 5},
1367                 {7, 7},
1368                 {0, 0}
1369                 }
1370         },
1371         {0, 1, 3, 0,            /* 0xba */
1372                 {{1, 1},
1373                 {3, 5},
1374                 {7, 7},
1375                 {0, 0}
1376                 }
1377         },
1378         {1, 1, 3, 0,            /* 0xbb */
1379                 {{0, 1},
1380                 {3, 5},
1381                 {7, 7},
1382                 {0, 0}
1383                 }
1384         },
1385         {0, 1, 2, 0,            /* 0xbc */
1386                 {{2, 5},
1387                 {7, 7},
1388                 {0, 0},
1389                 {0, 0}
1390                 }
1391         },
1392         {1, 1, 3, 0,            /* 0xbd */
1393                 {{0, 0},
1394                 {2, 5},
1395                 {7, 7},
1396                 {0, 0}
1397                 }
1398         },
1399         {0, 1, 2, 0,            /* 0xbe */
1400                 {{1, 5},
1401                 {7, 7},
1402                 {0, 0},
1403                 {0, 0}
1404                 }
1405         },
1406         {1, 1, 2, 0,            /* 0xbf */
1407                 {{0, 5},
1408                 {7, 7},
1409                 {0, 0},
1410                 {0, 0}
1411                 }
1412         },
1413         {0, 1, 1, 0,            /* 0xc0 */
1414                 {{6, 7},
1415                 {0, 0},
1416                 {0, 0},
1417                 {0, 0}
1418                 }
1419         },
1420         {1, 1, 2, 0,            /* 0xc1 */
1421                 {{0, 0},
1422                 {6, 7},
1423                 {0, 0},
1424                 {0, 0}
1425                 }
1426         },
1427         {0, 1, 2, 0,            /* 0xc2 */
1428                 {{1, 1},
1429                 {6, 7},
1430                 {0, 0},
1431                 {0, 0}
1432                 }
1433         },
1434         {1, 1, 2, 0,            /* 0xc3 */
1435                 {{0, 1},
1436                 {6, 7},
1437                 {0, 0},
1438                 {0, 0}
1439                 }
1440         },
1441         {0, 1, 2, 0,            /* 0xc4 */
1442                 {{2, 2},
1443                 {6, 7},
1444                 {0, 0},
1445                 {0, 0}
1446                 }
1447         },
1448         {1, 1, 3, 0,            /* 0xc5 */
1449                 {{0, 0},
1450                 {2, 2},
1451                 {6, 7},
1452                 {0, 0}
1453                 }
1454         },
1455         {0, 1, 2, 0,            /* 0xc6 */
1456                 {{1, 2},
1457                 {6, 7},
1458                 {0, 0},
1459                 {0, 0}
1460                 }
1461         },
1462         {1, 1, 2, 0,            /* 0xc7 */
1463                 {{0, 2},
1464                 {6, 7},
1465                 {0, 0},
1466                 {0, 0}
1467                 }
1468         },
1469         {0, 1, 2, 0,            /* 0xc8 */
1470                 {{3, 3},
1471                 {6, 7},
1472                 {0, 0},
1473                 {0, 0}
1474                 }
1475         },
1476         {1, 1, 3, 0,            /* 0xc9 */
1477                 {{0, 0},
1478                 {3, 3},
1479                 {6, 7},
1480                 {0, 0}
1481                 }
1482         },
1483         {0, 1, 3, 0,            /* 0xca */
1484                 {{1, 1},
1485                 {3, 3},
1486                 {6, 7},
1487                 {0, 0}
1488                 }
1489         },
1490         {1, 1, 3, 0,            /* 0xcb */
1491                 {{0, 1},
1492                 {3, 3},
1493                 {6, 7},
1494                 {0, 0}
1495                 }
1496         },
1497         {0, 1, 2, 0,            /* 0xcc */
1498                 {{2, 3},
1499                 {6, 7},
1500                 {0, 0},
1501                 {0, 0}
1502                 }
1503         },
1504         {1, 1, 3, 0,            /* 0xcd */
1505                 {{0, 0},
1506                 {2, 3},
1507                 {6, 7},
1508                 {0, 0}
1509                 }
1510         },
1511         {0, 1, 2, 0,            /* 0xce */
1512                 {{1, 3},
1513                 {6, 7},
1514                 {0, 0},
1515                 {0, 0}
1516                 }
1517         },
1518         {1, 1, 2, 0,            /* 0xcf */
1519                 {{0, 3},
1520                 {6, 7},
1521                 {0, 0},
1522                 {0, 0}
1523                 }
1524         },
1525         {0, 1, 2, 0,            /* 0xd0 */
1526                 {{4, 4},
1527                 {6, 7},
1528                 {0, 0},
1529                 {0, 0}
1530                 }
1531         },
1532         {1, 1, 3, 0,            /* 0xd1 */
1533                 {{0, 0},
1534                 {4, 4},
1535                 {6, 7},
1536                 {0, 0}
1537                 }
1538         },
1539         {0, 1, 3, 0,            /* 0xd2 */
1540                 {{1, 1},
1541                 {4, 4},
1542                 {6, 7},
1543                 {0, 0}
1544                 }
1545         },
1546         {1, 1, 3, 0,            /* 0xd3 */
1547                 {{0, 1},
1548                 {4, 4},
1549                 {6, 7},
1550                 {0, 0}
1551                 }
1552         },
1553         {0, 1, 3, 0,            /* 0xd4 */
1554                 {{2, 2},
1555                 {4, 4},
1556                 {6, 7},
1557                 {0, 0}
1558                 }
1559         },
1560         {1, 1, 4, 0,            /* 0xd5 */
1561                 {{0, 0},
1562                 {2, 2},
1563                 {4, 4},
1564                 {6, 7}
1565                 }
1566         },
1567         {0, 1, 3, 0,            /* 0xd6 */
1568                 {{1, 2},
1569                 {4, 4},
1570                 {6, 7},
1571                 {0, 0}
1572                 }
1573         },
1574         {1, 1, 3, 0,            /* 0xd7 */
1575                 {{0, 2},
1576                 {4, 4},
1577                 {6, 7},
1578                 {0, 0}
1579                 }
1580         },
1581         {0, 1, 2, 0,            /* 0xd8 */
1582                 {{3, 4},
1583                 {6, 7},
1584                 {0, 0},
1585                 {0, 0}
1586                 }
1587         },
1588         {1, 1, 3, 0,            /* 0xd9 */
1589                 {{0, 0},
1590                 {3, 4},
1591                 {6, 7},
1592                 {0, 0}
1593                 }
1594         },
1595         {0, 1, 3, 0,            /* 0xda */
1596                 {{1, 1},
1597                 {3, 4},
1598                 {6, 7},
1599                 {0, 0}
1600                 }
1601         },
1602         {1, 1, 3, 0,            /* 0xdb */
1603                 {{0, 1},
1604                 {3, 4},
1605                 {6, 7},
1606                 {0, 0}
1607                 }
1608         },
1609         {0, 1, 2, 0,            /* 0xdc */
1610                 {{2, 4},
1611                 {6, 7},
1612                 {0, 0},
1613                 {0, 0}
1614                 }
1615         },
1616         {1, 1, 3, 0,            /* 0xdd */
1617                 {{0, 0},
1618                 {2, 4},
1619                 {6, 7},
1620                 {0, 0}
1621                 }
1622         },
1623         {0, 1, 2, 0,            /* 0xde */
1624                 {{1, 4},
1625                 {6, 7},
1626                 {0, 0},
1627                 {0, 0}
1628                 }
1629         },
1630         {1, 1, 2, 0,            /* 0xdf */
1631                 {{0, 4},
1632                 {6, 7},
1633                 {0, 0},
1634                 {0, 0}
1635                 }
1636         },
1637         {0, 1, 1, 0,            /* 0xe0 */
1638                 {{5, 7},
1639                 {0, 0},
1640                 {0, 0},
1641                 {0, 0}
1642                 }
1643         },
1644         {1, 1, 2, 0,            /* 0xe1 */
1645                 {{0, 0},
1646                 {5, 7},
1647                 {0, 0},
1648                 {0, 0}
1649                 }
1650         },
1651         {0, 1, 2, 0,            /* 0xe2 */
1652                 {{1, 1},
1653                 {5, 7},
1654                 {0, 0},
1655                 {0, 0}
1656                 }
1657         },
1658         {1, 1, 2, 0,            /* 0xe3 */
1659                 {{0, 1},
1660                 {5, 7},
1661                 {0, 0},
1662                 {0, 0}
1663                 }
1664         },
1665         {0, 1, 2, 0,            /* 0xe4 */
1666                 {{2, 2},
1667                 {5, 7},
1668                 {0, 0},
1669                 {0, 0}
1670                 }
1671         },
1672         {1, 1, 3, 0,            /* 0xe5 */
1673                 {{0, 0},
1674                 {2, 2},
1675                 {5, 7},
1676                 {0, 0}
1677                 }
1678         },
1679         {0, 1, 2, 0,            /* 0xe6 */
1680                 {{1, 2},
1681                 {5, 7},
1682                 {0, 0},
1683                 {0, 0}
1684                 }
1685         },
1686         {1, 1, 2, 0,            /* 0xe7 */
1687                 {{0, 2},
1688                 {5, 7},
1689                 {0, 0},
1690                 {0, 0}
1691                 }
1692         },
1693         {0, 1, 2, 0,            /* 0xe8 */
1694                 {{3, 3},
1695                 {5, 7},
1696                 {0, 0},
1697                 {0, 0}
1698                 }
1699         },
1700         {1, 1, 3, 0,            /* 0xe9 */
1701                 {{0, 0},
1702                 {3, 3},
1703                 {5, 7},
1704                 {0, 0}
1705                 }
1706         },
1707         {0, 1, 3, 0,            /* 0xea */
1708                 {{1, 1},
1709                 {3, 3},
1710                 {5, 7},
1711                 {0, 0}
1712                 }
1713         },
1714         {1, 1, 3, 0,            /* 0xeb */
1715                 {{0, 1},
1716                 {3, 3},
1717                 {5, 7},
1718                 {0, 0}
1719                 }
1720         },
1721         {0, 1, 2, 0,            /* 0xec */
1722                 {{2, 3},
1723                 {5, 7},
1724                 {0, 0},
1725                 {0, 0}
1726                 }
1727         },
1728         {1, 1, 3, 0,            /* 0xed */
1729                 {{0, 0},
1730                 {2, 3},
1731                 {5, 7},
1732                 {0, 0}
1733                 }
1734         },
1735         {0, 1, 2, 0,            /* 0xee */
1736                 {{1, 3},
1737                 {5, 7},
1738                 {0, 0},
1739                 {0, 0}
1740                 }
1741         },
1742         {1, 1, 2, 0,            /* 0xef */
1743                 {{0, 3},
1744                 {5, 7},
1745                 {0, 0},
1746                 {0, 0}
1747                 }
1748         },
1749         {0, 1, 1, 0,            /* 0xf0 */
1750                 {{4, 7},
1751                 {0, 0},
1752                 {0, 0},
1753                 {0, 0}
1754                 }
1755         },
1756         {1, 1, 2, 0,            /* 0xf1 */
1757                 {{0, 0},
1758                 {4, 7},
1759                 {0, 0},
1760                 {0, 0}
1761                 }
1762         },
1763         {0, 1, 2, 0,            /* 0xf2 */
1764                 {{1, 1},
1765                 {4, 7},
1766                 {0, 0},
1767                 {0, 0}
1768                 }
1769         },
1770         {1, 1, 2, 0,            /* 0xf3 */
1771                 {{0, 1},
1772                 {4, 7},
1773                 {0, 0},
1774                 {0, 0}
1775                 }
1776         },
1777         {0, 1, 2, 0,            /* 0xf4 */
1778                 {{2, 2},
1779                 {4, 7},
1780                 {0, 0},
1781                 {0, 0}
1782                 }
1783         },
1784         {1, 1, 3, 0,            /* 0xf5 */
1785                 {{0, 0},
1786                 {2, 2},
1787                 {4, 7},
1788                 {0, 0}
1789                 }
1790         },
1791         {0, 1, 2, 0,            /* 0xf6 */
1792                 {{1, 2},
1793                 {4, 7},
1794                 {0, 0},
1795                 {0, 0}
1796                 }
1797         },
1798         {1, 1, 2, 0,            /* 0xf7 */
1799                 {{0, 2},
1800                 {4, 7},
1801                 {0, 0},
1802                 {0, 0}
1803                 }
1804         },
1805         {0, 1, 1, 0,            /* 0xf8 */
1806                 {{3, 7},
1807                 {0, 0},
1808                 {0, 0},
1809                 {0, 0}
1810                 }
1811         },
1812         {1, 1, 2, 0,            /* 0xf9 */
1813                 {{0, 0},
1814                 {3, 7},
1815                 {0, 0},
1816                 {0, 0}
1817                 }
1818         },
1819         {0, 1, 2, 0,            /* 0xfa */
1820                 {{1, 1},
1821                 {3, 7},
1822                 {0, 0},
1823                 {0, 0}
1824                 }
1825         },
1826         {1, 1, 2, 0,            /* 0xfb */
1827                 {{0, 1},
1828                 {3, 7},
1829                 {0, 0},
1830                 {0, 0}
1831                 }
1832         },
1833         {0, 1, 1, 0,            /* 0xfc */
1834                 {{2, 7},
1835                 {0, 0},
1836                 {0, 0},
1837                 {0, 0}
1838                 }
1839         },
1840         {1, 1, 2, 0,            /* 0xfd */
1841                 {{0, 0},
1842                 {2, 7},
1843                 {0, 0},
1844                 {0, 0}
1845                 }
1846         },
1847         {0, 1, 1, 0,            /* 0xfe */
1848                 {{1, 7},
1849                 {0, 0},
1850                 {0, 0},
1851                 {0, 0}
1852                 }
1853         },
1854         {1, 1, 1, 0,            /* 0xff */
1855                 {{0, 7},
1856                 {0, 0},
1857                 {0, 0},
1858                 {0, 0}
1859                 }
1860         }
1861 };
1862
1863
1864 int
1865 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1866     struct sctp_scoping *scope,
1867     int do_update)
1868 {
1869         if ((scope->loopback_scope == 0) &&
1870             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1871                 /*
1872                  * skip loopback if not in scope *
1873                  */
1874                 return (0);
1875         }
1876         switch (ifa->address.sa.sa_family) {
1877 #ifdef INET
1878         case AF_INET:
1879                 if (scope->ipv4_addr_legal) {
1880                         struct sockaddr_in *sin;
1881
1882                         sin = (struct sockaddr_in *)&ifa->address.sin;
1883                         if (sin->sin_addr.s_addr == 0) {
1884                                 /* not in scope , unspecified */
1885                                 return (0);
1886                         }
1887                         if ((scope->ipv4_local_scope == 0) &&
1888                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1889                                 /* private address not in scope */
1890                                 return (0);
1891                         }
1892                 } else {
1893                         return (0);
1894                 }
1895                 break;
1896 #endif
1897 #ifdef INET6
1898         case AF_INET6:
1899                 if (scope->ipv6_addr_legal) {
1900                         struct sockaddr_in6 *sin6;
1901
1902                         /*
1903                          * Must update the flags,  bummer, which means any
1904                          * IFA locks must now be applied HERE <->
1905                          */
1906                         if (do_update) {
1907                                 sctp_gather_internal_ifa_flags(ifa);
1908                         }
1909                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1910                                 return (0);
1911                         }
1912                         /* ok to use deprecated addresses? */
1913                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1914                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1915                                 /* skip unspecifed addresses */
1916                                 return (0);
1917                         }
1918                         if (    /* (local_scope == 0) && */
1919                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1920                                 return (0);
1921                         }
1922                         if ((scope->site_scope == 0) &&
1923                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1924                                 return (0);
1925                         }
1926                 } else {
1927                         return (0);
1928                 }
1929                 break;
1930 #endif
1931         default:
1932                 return (0);
1933         }
1934         return (1);
1935 }
1936
1937 static struct mbuf *
1938 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1939 {
1940         struct sctp_paramhdr *parmh;
1941         struct mbuf *mret;
1942         uint16_t plen;
1943
1944         switch (ifa->address.sa.sa_family) {
1945 #ifdef INET
1946         case AF_INET:
1947                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1948                 break;
1949 #endif
1950 #ifdef INET6
1951         case AF_INET6:
1952                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1953                 break;
1954 #endif
1955         default:
1956                 return (m);
1957         }
1958         if (M_TRAILINGSPACE(m) >= plen) {
1959                 /* easy side we just drop it on the end */
1960                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1961                 mret = m;
1962         } else {
1963                 /* Need more space */
1964                 mret = m;
1965                 while (SCTP_BUF_NEXT(mret) != NULL) {
1966                         mret = SCTP_BUF_NEXT(mret);
1967                 }
1968                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_DONTWAIT, 1, MT_DATA);
1969                 if (SCTP_BUF_NEXT(mret) == NULL) {
1970                         /* We are hosed, can't add more addresses */
1971                         return (m);
1972                 }
1973                 mret = SCTP_BUF_NEXT(mret);
1974                 parmh = mtod(mret, struct sctp_paramhdr *);
1975         }
1976         /* now add the parameter */
1977         switch (ifa->address.sa.sa_family) {
1978 #ifdef INET
1979         case AF_INET:
1980                 {
1981                         struct sctp_ipv4addr_param *ipv4p;
1982                         struct sockaddr_in *sin;
1983
1984                         sin = (struct sockaddr_in *)&ifa->address.sin;
1985                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1986                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1987                         parmh->param_length = htons(plen);
1988                         ipv4p->addr = sin->sin_addr.s_addr;
1989                         SCTP_BUF_LEN(mret) += plen;
1990                         break;
1991                 }
1992 #endif
1993 #ifdef INET6
1994         case AF_INET6:
1995                 {
1996                         struct sctp_ipv6addr_param *ipv6p;
1997                         struct sockaddr_in6 *sin6;
1998
1999                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2000                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2001                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2002                         parmh->param_length = htons(plen);
2003                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2004                             sizeof(ipv6p->addr));
2005                         /* clear embedded scope in the address */
2006                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2007                         SCTP_BUF_LEN(mret) += plen;
2008                         break;
2009                 }
2010 #endif
2011         default:
2012                 return (m);
2013         }
2014         if (len != NULL) {
2015                 *len += plen;
2016         }
2017         return (mret);
2018 }
2019
2020
2021 struct mbuf *
2022 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2023     struct sctp_scoping *scope,
2024     struct mbuf *m_at, int cnt_inits_to,
2025     uint16_t * padding_len, uint16_t * chunk_len)
2026 {
2027         struct sctp_vrf *vrf = NULL;
2028         int cnt, limit_out = 0, total_count;
2029         uint32_t vrf_id;
2030
2031         vrf_id = inp->def_vrf_id;
2032         SCTP_IPI_ADDR_RLOCK();
2033         vrf = sctp_find_vrf(vrf_id);
2034         if (vrf == NULL) {
2035                 SCTP_IPI_ADDR_RUNLOCK();
2036                 return (m_at);
2037         }
2038         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2039                 struct sctp_ifa *sctp_ifap;
2040                 struct sctp_ifn *sctp_ifnp;
2041
2042                 cnt = cnt_inits_to;
2043                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2044                         limit_out = 1;
2045                         cnt = SCTP_ADDRESS_LIMIT;
2046                         goto skip_count;
2047                 }
2048                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2049                         if ((scope->loopback_scope == 0) &&
2050                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2051                                 /*
2052                                  * Skip loopback devices if loopback_scope
2053                                  * not set
2054                                  */
2055                                 continue;
2056                         }
2057                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2058                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2059                                         continue;
2060                                 }
2061                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2062                                         continue;
2063                                 }
2064                                 cnt++;
2065                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2066                                         break;
2067                                 }
2068                         }
2069                         if (cnt > SCTP_ADDRESS_LIMIT) {
2070                                 break;
2071                         }
2072                 }
2073 skip_count:
2074                 if (cnt > 1) {
2075                         total_count = 0;
2076                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2077                                 cnt = 0;
2078                                 if ((scope->loopback_scope == 0) &&
2079                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2080                                         /*
2081                                          * Skip loopback devices if
2082                                          * loopback_scope not set
2083                                          */
2084                                         continue;
2085                                 }
2086                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2087                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2088                                                 continue;
2089                                         }
2090                                         if (sctp_is_address_in_scope(sctp_ifap,
2091                                             scope, 0) == 0) {
2092                                                 continue;
2093                                         }
2094                                         if ((chunk_len != NULL) &&
2095                                             (padding_len != NULL) &&
2096                                             (*padding_len > 0)) {
2097                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2098                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2099                                                 *chunk_len += *padding_len;
2100                                                 *padding_len = 0;
2101                                         }
2102                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2103                                         if (limit_out) {
2104                                                 cnt++;
2105                                                 total_count++;
2106                                                 if (cnt >= 2) {
2107                                                         /*
2108                                                          * two from each
2109                                                          * address
2110                                                          */
2111                                                         break;
2112                                                 }
2113                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2114                                                         /* No more addresses */
2115                                                         break;
2116                                                 }
2117                                         }
2118                                 }
2119                         }
2120                 }
2121         } else {
2122                 struct sctp_laddr *laddr;
2123
2124                 cnt = cnt_inits_to;
2125                 /* First, how many ? */
2126                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2127                         if (laddr->ifa == NULL) {
2128                                 continue;
2129                         }
2130                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2131                                 /*
2132                                  * Address being deleted by the system, dont
2133                                  * list.
2134                                  */
2135                                 continue;
2136                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2137                                 /*
2138                                  * Address being deleted on this ep don't
2139                                  * list.
2140                                  */
2141                                 continue;
2142                         }
2143                         if (sctp_is_address_in_scope(laddr->ifa,
2144                             scope, 1) == 0) {
2145                                 continue;
2146                         }
2147                         cnt++;
2148                 }
2149                 /*
2150                  * To get through a NAT we only list addresses if we have
2151                  * more than one. That way if you just bind a single address
2152                  * we let the source of the init dictate our address.
2153                  */
2154                 if (cnt > 1) {
2155                         cnt = cnt_inits_to;
2156                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2157                                 if (laddr->ifa == NULL) {
2158                                         continue;
2159                                 }
2160                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2161                                         continue;
2162                                 }
2163                                 if (sctp_is_address_in_scope(laddr->ifa,
2164                                     scope, 0) == 0) {
2165                                         continue;
2166                                 }
2167                                 if ((chunk_len != NULL) &&
2168                                     (padding_len != NULL) &&
2169                                     (*padding_len > 0)) {
2170                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2171                                         SCTP_BUF_LEN(m_at) += *padding_len;
2172                                         *chunk_len += *padding_len;
2173                                         *padding_len = 0;
2174                                 }
2175                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2176                                 cnt++;
2177                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2178                                         break;
2179                                 }
2180                         }
2181                 }
2182         }
2183         SCTP_IPI_ADDR_RUNLOCK();
2184         return (m_at);
2185 }
2186
2187 static struct sctp_ifa *
2188 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2189     uint8_t dest_is_loop,
2190     uint8_t dest_is_priv,
2191     sa_family_t fam)
2192 {
2193         uint8_t dest_is_global = 0;
2194
2195         /* dest_is_priv is true if destination is a private address */
2196         /* dest_is_loop is true if destination is a loopback addresses */
2197
2198         /**
2199          * Here we determine if its a preferred address. A preferred address
2200          * means it is the same scope or higher scope then the destination.
2201          * L = loopback, P = private, G = global
2202          * -----------------------------------------
2203          *    src    |  dest | result
2204          *  ----------------------------------------
2205          *     L     |    L  |    yes
2206          *  -----------------------------------------
2207          *     P     |    L  |    yes-v4 no-v6
2208          *  -----------------------------------------
2209          *     G     |    L  |    yes-v4 no-v6
2210          *  -----------------------------------------
2211          *     L     |    P  |    no
2212          *  -----------------------------------------
2213          *     P     |    P  |    yes
2214          *  -----------------------------------------
2215          *     G     |    P  |    no
2216          *   -----------------------------------------
2217          *     L     |    G  |    no
2218          *   -----------------------------------------
2219          *     P     |    G  |    no
2220          *    -----------------------------------------
2221          *     G     |    G  |    yes
2222          *    -----------------------------------------
2223          */
2224
2225         if (ifa->address.sa.sa_family != fam) {
2226                 /* forget mis-matched family */
2227                 return (NULL);
2228         }
2229         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2230                 dest_is_global = 1;
2231         }
2232         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2233         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2234         /* Ok the address may be ok */
2235 #ifdef INET6
2236         if (fam == AF_INET6) {
2237                 /* ok to use deprecated addresses? no lets not! */
2238                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2239                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2240                         return (NULL);
2241                 }
2242                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2243                         if (dest_is_loop) {
2244                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2245                                 return (NULL);
2246                         }
2247                 }
2248                 if (ifa->src_is_glob) {
2249                         if (dest_is_loop) {
2250                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2251                                 return (NULL);
2252                         }
2253                 }
2254         }
2255 #endif
2256         /*
2257          * Now that we know what is what, implement or table this could in
2258          * theory be done slicker (it used to be), but this is
2259          * straightforward and easier to validate :-)
2260          */
2261         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2262             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2263         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2264             dest_is_loop, dest_is_priv, dest_is_global);
2265
2266         if ((ifa->src_is_loop) && (dest_is_priv)) {
2267                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2268                 return (NULL);
2269         }
2270         if ((ifa->src_is_glob) && (dest_is_priv)) {
2271                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2272                 return (NULL);
2273         }
2274         if ((ifa->src_is_loop) && (dest_is_global)) {
2275                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2276                 return (NULL);
2277         }
2278         if ((ifa->src_is_priv) && (dest_is_global)) {
2279                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2280                 return (NULL);
2281         }
2282         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2283         /* its a preferred address */
2284         return (ifa);
2285 }
2286
2287 static struct sctp_ifa *
2288 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2289     uint8_t dest_is_loop,
2290     uint8_t dest_is_priv,
2291     sa_family_t fam)
2292 {
2293         uint8_t dest_is_global = 0;
2294
2295         /**
2296          * Here we determine if its a acceptable address. A acceptable
2297          * address means it is the same scope or higher scope but we can
2298          * allow for NAT which means its ok to have a global dest and a
2299          * private src.
2300          *
2301          * L = loopback, P = private, G = global
2302          * -----------------------------------------
2303          *  src    |  dest | result
2304          * -----------------------------------------
2305          *   L     |   L   |    yes
2306          *  -----------------------------------------
2307          *   P     |   L   |    yes-v4 no-v6
2308          *  -----------------------------------------
2309          *   G     |   L   |    yes
2310          * -----------------------------------------
2311          *   L     |   P   |    no
2312          * -----------------------------------------
2313          *   P     |   P   |    yes
2314          * -----------------------------------------
2315          *   G     |   P   |    yes - May not work
2316          * -----------------------------------------
2317          *   L     |   G   |    no
2318          * -----------------------------------------
2319          *   P     |   G   |    yes - May not work
2320          * -----------------------------------------
2321          *   G     |   G   |    yes
2322          * -----------------------------------------
2323          */
2324
2325         if (ifa->address.sa.sa_family != fam) {
2326                 /* forget non matching family */
2327                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2328                     ifa->address.sa.sa_family, fam);
2329                 return (NULL);
2330         }
2331         /* Ok the address may be ok */
2332         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2333         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2334             dest_is_loop, dest_is_priv);
2335         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2336                 dest_is_global = 1;
2337         }
2338 #ifdef INET6
2339         if (fam == AF_INET6) {
2340                 /* ok to use deprecated addresses? */
2341                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2342                         return (NULL);
2343                 }
2344                 if (ifa->src_is_priv) {
2345                         /* Special case, linklocal to loop */
2346                         if (dest_is_loop)
2347                                 return (NULL);
2348                 }
2349         }
2350 #endif
2351         /*
2352          * Now that we know what is what, implement our table. This could in
2353          * theory be done slicker (it used to be), but this is
2354          * straightforward and easier to validate :-)
2355          */
2356         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2357             ifa->src_is_loop,
2358             dest_is_priv);
2359         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2360                 return (NULL);
2361         }
2362         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2363             ifa->src_is_loop,
2364             dest_is_global);
2365         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2366                 return (NULL);
2367         }
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2369         /* its an acceptable address */
2370         return (ifa);
2371 }
2372
2373 int
2374 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2375 {
2376         struct sctp_laddr *laddr;
2377
2378         if (stcb == NULL) {
2379                 /* There are no restrictions, no TCB :-) */
2380                 return (0);
2381         }
2382         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2383                 if (laddr->ifa == NULL) {
2384                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2385                             __FUNCTION__);
2386                         continue;
2387                 }
2388                 if (laddr->ifa == ifa) {
2389                         /* Yes it is on the list */
2390                         return (1);
2391                 }
2392         }
2393         return (0);
2394 }
2395
2396
2397 int
2398 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2399 {
2400         struct sctp_laddr *laddr;
2401
2402         if (ifa == NULL)
2403                 return (0);
2404         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2405                 if (laddr->ifa == NULL) {
2406                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2407                             __FUNCTION__);
2408                         continue;
2409                 }
2410                 if ((laddr->ifa == ifa) && laddr->action == 0)
2411                         /* same pointer */
2412                         return (1);
2413         }
2414         return (0);
2415 }
2416
2417
2418
2419 static struct sctp_ifa *
2420 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2421     sctp_route_t * ro,
2422     uint32_t vrf_id,
2423     int non_asoc_addr_ok,
2424     uint8_t dest_is_priv,
2425     uint8_t dest_is_loop,
2426     sa_family_t fam)
2427 {
2428         struct sctp_laddr *laddr, *starting_point;
2429         void *ifn;
2430         int resettotop = 0;
2431         struct sctp_ifn *sctp_ifn;
2432         struct sctp_ifa *sctp_ifa, *sifa;
2433         struct sctp_vrf *vrf;
2434         uint32_t ifn_index;
2435
2436         vrf = sctp_find_vrf(vrf_id);
2437         if (vrf == NULL)
2438                 return (NULL);
2439
2440         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2441         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2442         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2443         /*
2444          * first question, is the ifn we will emit on in our list, if so, we
2445          * want such an address. Note that we first looked for a preferred
2446          * address.
2447          */
2448         if (sctp_ifn) {
2449                 /* is a preferred one on the interface we route out? */
2450                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2451                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2452                             (non_asoc_addr_ok == 0))
2453                                 continue;
2454                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2455                             dest_is_loop,
2456                             dest_is_priv, fam);
2457                         if (sifa == NULL)
2458                                 continue;
2459                         if (sctp_is_addr_in_ep(inp, sifa)) {
2460                                 atomic_add_int(&sifa->refcount, 1);
2461                                 return (sifa);
2462                         }
2463                 }
2464         }
2465         /*
2466          * ok, now we now need to find one on the list of the addresses. We
2467          * can't get one on the emitting interface so let's find first a
2468          * preferred one. If not that an acceptable one otherwise... we
2469          * return NULL.
2470          */
2471         starting_point = inp->next_addr_touse;
2472 once_again:
2473         if (inp->next_addr_touse == NULL) {
2474                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2475                 resettotop = 1;
2476         }
2477         for (laddr = inp->next_addr_touse; laddr;
2478             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2479                 if (laddr->ifa == NULL) {
2480                         /* address has been removed */
2481                         continue;
2482                 }
2483                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2484                         /* address is being deleted */
2485                         continue;
2486                 }
2487                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2488                     dest_is_priv, fam);
2489                 if (sifa == NULL)
2490                         continue;
2491                 atomic_add_int(&sifa->refcount, 1);
2492                 return (sifa);
2493         }
2494         if (resettotop == 0) {
2495                 inp->next_addr_touse = NULL;
2496                 goto once_again;
2497         }
2498         inp->next_addr_touse = starting_point;
2499         resettotop = 0;
2500 once_again_too:
2501         if (inp->next_addr_touse == NULL) {
2502                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2503                 resettotop = 1;
2504         }
2505         /* ok, what about an acceptable address in the inp */
2506         for (laddr = inp->next_addr_touse; laddr;
2507             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2508                 if (laddr->ifa == NULL) {
2509                         /* address has been removed */
2510                         continue;
2511                 }
2512                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2513                         /* address is being deleted */
2514                         continue;
2515                 }
2516                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2517                     dest_is_priv, fam);
2518                 if (sifa == NULL)
2519                         continue;
2520                 atomic_add_int(&sifa->refcount, 1);
2521                 return (sifa);
2522         }
2523         if (resettotop == 0) {
2524                 inp->next_addr_touse = NULL;
2525                 goto once_again_too;
2526         }
2527         /*
2528          * no address bound can be a source for the destination we are in
2529          * trouble
2530          */
2531         return (NULL);
2532 }
2533
2534
2535
2536 static struct sctp_ifa *
2537 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2538     struct sctp_tcb *stcb,
2539     sctp_route_t * ro,
2540     uint32_t vrf_id,
2541     uint8_t dest_is_priv,
2542     uint8_t dest_is_loop,
2543     int non_asoc_addr_ok,
2544     sa_family_t fam)
2545 {
2546         struct sctp_laddr *laddr, *starting_point;
2547         void *ifn;
2548         struct sctp_ifn *sctp_ifn;
2549         struct sctp_ifa *sctp_ifa, *sifa;
2550         uint8_t start_at_beginning = 0;
2551         struct sctp_vrf *vrf;
2552         uint32_t ifn_index;
2553
2554         /*
2555          * first question, is the ifn we will emit on in our list, if so, we
2556          * want that one.
2557          */
2558         vrf = sctp_find_vrf(vrf_id);
2559         if (vrf == NULL)
2560                 return (NULL);
2561
2562         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2563         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2564         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2565
2566         /*
2567          * first question, is the ifn we will emit on in our list?  If so,
2568          * we want that one. First we look for a preferred. Second, we go
2569          * for an acceptable.
2570          */
2571         if (sctp_ifn) {
2572                 /* first try for a preferred address on the ep */
2573                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2574                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2575                                 continue;
2576                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2577                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2578                                 if (sifa == NULL)
2579                                         continue;
2580                                 if (((non_asoc_addr_ok == 0) &&
2581                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2582                                     (non_asoc_addr_ok &&
2583                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2584                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2585                                         /* on the no-no list */
2586                                         continue;
2587                                 }
2588                                 atomic_add_int(&sifa->refcount, 1);
2589                                 return (sifa);
2590                         }
2591                 }
2592                 /* next try for an acceptable address on the ep */
2593                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2594                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2595                                 continue;
2596                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2597                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2598                                 if (sifa == NULL)
2599                                         continue;
2600                                 if (((non_asoc_addr_ok == 0) &&
2601                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2602                                     (non_asoc_addr_ok &&
2603                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2604                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2605                                         /* on the no-no list */
2606                                         continue;
2607                                 }
2608                                 atomic_add_int(&sifa->refcount, 1);
2609                                 return (sifa);
2610                         }
2611                 }
2612
2613         }
2614         /*
2615          * if we can't find one like that then we must look at all addresses
2616          * bound to pick one at first preferable then secondly acceptable.
2617          */
2618         starting_point = stcb->asoc.last_used_address;
2619 sctp_from_the_top:
2620         if (stcb->asoc.last_used_address == NULL) {
2621                 start_at_beginning = 1;
2622                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2623         }
2624         /* search beginning with the last used address */
2625         for (laddr = stcb->asoc.last_used_address; laddr;
2626             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2627                 if (laddr->ifa == NULL) {
2628                         /* address has been removed */
2629                         continue;
2630                 }
2631                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2632                         /* address is being deleted */
2633                         continue;
2634                 }
2635                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2636                 if (sifa == NULL)
2637                         continue;
2638                 if (((non_asoc_addr_ok == 0) &&
2639                     (sctp_is_addr_restricted(stcb, sifa))) ||
2640                     (non_asoc_addr_ok &&
2641                     (sctp_is_addr_restricted(stcb, sifa)) &&
2642                     (!sctp_is_addr_pending(stcb, sifa)))) {
2643                         /* on the no-no list */
2644                         continue;
2645                 }
2646                 stcb->asoc.last_used_address = laddr;
2647                 atomic_add_int(&sifa->refcount, 1);
2648                 return (sifa);
2649         }
2650         if (start_at_beginning == 0) {
2651                 stcb->asoc.last_used_address = NULL;
2652                 goto sctp_from_the_top;
2653         }
2654         /* now try for any higher scope than the destination */
2655         stcb->asoc.last_used_address = starting_point;
2656         start_at_beginning = 0;
2657 sctp_from_the_top2:
2658         if (stcb->asoc.last_used_address == NULL) {
2659                 start_at_beginning = 1;
2660                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2661         }
2662         /* search beginning with the last used address */
2663         for (laddr = stcb->asoc.last_used_address; laddr;
2664             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2665                 if (laddr->ifa == NULL) {
2666                         /* address has been removed */
2667                         continue;
2668                 }
2669                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2670                         /* address is being deleted */
2671                         continue;
2672                 }
2673                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2674                     dest_is_priv, fam);
2675                 if (sifa == NULL)
2676                         continue;
2677                 if (((non_asoc_addr_ok == 0) &&
2678                     (sctp_is_addr_restricted(stcb, sifa))) ||
2679                     (non_asoc_addr_ok &&
2680                     (sctp_is_addr_restricted(stcb, sifa)) &&
2681                     (!sctp_is_addr_pending(stcb, sifa)))) {
2682                         /* on the no-no list */
2683                         continue;
2684                 }
2685                 stcb->asoc.last_used_address = laddr;
2686                 atomic_add_int(&sifa->refcount, 1);
2687                 return (sifa);
2688         }
2689         if (start_at_beginning == 0) {
2690                 stcb->asoc.last_used_address = NULL;
2691                 goto sctp_from_the_top2;
2692         }
2693         return (NULL);
2694 }
2695
2696 static struct sctp_ifa *
2697 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2698     struct sctp_tcb *stcb,
2699     int non_asoc_addr_ok,
2700     uint8_t dest_is_loop,
2701     uint8_t dest_is_priv,
2702     int addr_wanted,
2703     sa_family_t fam,
2704     sctp_route_t * ro
2705 )
2706 {
2707         struct sctp_ifa *ifa, *sifa;
2708         int num_eligible_addr = 0;
2709
2710 #ifdef INET6
2711         struct sockaddr_in6 sin6, lsa6;
2712
2713         if (fam == AF_INET6) {
2714                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2715                 (void)sa6_recoverscope(&sin6);
2716         }
2717 #endif                          /* INET6 */
2718         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2719                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2720                     (non_asoc_addr_ok == 0))
2721                         continue;
2722                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2723                     dest_is_priv, fam);
2724                 if (sifa == NULL)
2725                         continue;
2726 #ifdef INET6
2727                 if (fam == AF_INET6 &&
2728                     dest_is_loop &&
2729                     sifa->src_is_loop && sifa->src_is_priv) {
2730                         /*
2731                          * don't allow fe80::1 to be a src on loop ::1, we
2732                          * don't list it to the peer so we will get an
2733                          * abort.
2734                          */
2735                         continue;
2736                 }
2737                 if (fam == AF_INET6 &&
2738                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2739                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2740                         /*
2741                          * link-local <-> link-local must belong to the same
2742                          * scope.
2743                          */
2744                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2745                         (void)sa6_recoverscope(&lsa6);
2746                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2747                                 continue;
2748                         }
2749                 }
2750 #endif                          /* INET6 */
2751
2752                 /*
2753                  * Check if the IPv6 address matches to next-hop. In the
2754                  * mobile case, old IPv6 address may be not deleted from the
2755                  * interface. Then, the interface has previous and new
2756                  * addresses.  We should use one corresponding to the
2757                  * next-hop.  (by micchie)
2758                  */
2759 #ifdef INET6
2760                 if (stcb && fam == AF_INET6 &&
2761                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2762                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2763                             == 0) {
2764                                 continue;
2765                         }
2766                 }
2767 #endif
2768 #ifdef INET
2769                 /* Avoid topologically incorrect IPv4 address */
2770                 if (stcb && fam == AF_INET &&
2771                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2772                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2773                                 continue;
2774                         }
2775                 }
2776 #endif
2777                 if (stcb) {
2778                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2779                                 continue;
2780                         }
2781                         if (((non_asoc_addr_ok == 0) &&
2782                             (sctp_is_addr_restricted(stcb, sifa))) ||
2783                             (non_asoc_addr_ok &&
2784                             (sctp_is_addr_restricted(stcb, sifa)) &&
2785                             (!sctp_is_addr_pending(stcb, sifa)))) {
2786                                 /*
2787                                  * It is restricted for some reason..
2788                                  * probably not yet added.
2789                                  */
2790                                 continue;
2791                         }
2792                 }
2793                 if (num_eligible_addr >= addr_wanted) {
2794                         return (sifa);
2795                 }
2796                 num_eligible_addr++;
2797         }
2798         return (NULL);
2799 }
2800
2801
2802 static int
2803 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2804     struct sctp_tcb *stcb,
2805     int non_asoc_addr_ok,
2806     uint8_t dest_is_loop,
2807     uint8_t dest_is_priv,
2808     sa_family_t fam)
2809 {
2810         struct sctp_ifa *ifa, *sifa;
2811         int num_eligible_addr = 0;
2812
2813         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2814                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2815                     (non_asoc_addr_ok == 0)) {
2816                         continue;
2817                 }
2818                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2819                     dest_is_priv, fam);
2820                 if (sifa == NULL) {
2821                         continue;
2822                 }
2823                 if (stcb) {
2824                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2825                                 continue;
2826                         }
2827                         if (((non_asoc_addr_ok == 0) &&
2828                             (sctp_is_addr_restricted(stcb, sifa))) ||
2829                             (non_asoc_addr_ok &&
2830                             (sctp_is_addr_restricted(stcb, sifa)) &&
2831                             (!sctp_is_addr_pending(stcb, sifa)))) {
2832                                 /*
2833                                  * It is restricted for some reason..
2834                                  * probably not yet added.
2835                                  */
2836                                 continue;
2837                         }
2838                 }
2839                 num_eligible_addr++;
2840         }
2841         return (num_eligible_addr);
2842 }
2843
2844 static struct sctp_ifa *
2845 sctp_choose_boundall(struct sctp_tcb *stcb,
2846     struct sctp_nets *net,
2847     sctp_route_t * ro,
2848     uint32_t vrf_id,
2849     uint8_t dest_is_priv,
2850     uint8_t dest_is_loop,
2851     int non_asoc_addr_ok,
2852     sa_family_t fam)
2853 {
2854         int cur_addr_num = 0, num_preferred = 0;
2855         void *ifn;
2856         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2857         struct sctp_ifa *sctp_ifa, *sifa;
2858         uint32_t ifn_index;
2859         struct sctp_vrf *vrf;
2860
2861 #ifdef INET
2862         int retried = 0;
2863
2864 #endif
2865
2866         /*-
2867          * For boundall we can use any address in the association.
2868          * If non_asoc_addr_ok is set we can use any address (at least in
2869          * theory). So we look for preferred addresses first. If we find one,
2870          * we use it. Otherwise we next try to get an address on the
2871          * interface, which we should be able to do (unless non_asoc_addr_ok
2872          * is false and we are routed out that way). In these cases where we
2873          * can't use the address of the interface we go through all the
2874          * ifn's looking for an address we can use and fill that in. Punting
2875          * means we send back address 0, which will probably cause problems
2876          * actually since then IP will fill in the address of the route ifn,
2877          * which means we probably already rejected it.. i.e. here comes an
2878          * abort :-<.
2879          */
2880         vrf = sctp_find_vrf(vrf_id);
2881         if (vrf == NULL)
2882                 return (NULL);
2883
2884         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2885         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2886         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2887         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2888         if (sctp_ifn == NULL) {
2889                 /* ?? We don't have this guy ?? */
2890                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2891                 goto bound_all_plan_b;
2892         }
2893         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2894             ifn_index, sctp_ifn->ifn_name);
2895
2896         if (net) {
2897                 cur_addr_num = net->indx_of_eligible_next_to_use;
2898         }
2899         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2900             stcb,
2901             non_asoc_addr_ok,
2902             dest_is_loop,
2903             dest_is_priv, fam);
2904         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2905             num_preferred, sctp_ifn->ifn_name);
2906         if (num_preferred == 0) {
2907                 /*
2908                  * no eligible addresses, we must use some other interface
2909                  * address if we can find one.
2910                  */
2911                 goto bound_all_plan_b;
2912         }
2913         /*
2914          * Ok we have num_eligible_addr set with how many we can use, this
2915          * may vary from call to call due to addresses being deprecated
2916          * etc..
2917          */
2918         if (cur_addr_num >= num_preferred) {
2919                 cur_addr_num = 0;
2920         }
2921         /*
2922          * select the nth address from the list (where cur_addr_num is the
2923          * nth) and 0 is the first one, 1 is the second one etc...
2924          */
2925         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2926
2927         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2928             dest_is_priv, cur_addr_num, fam, ro);
2929
2930         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2931         if (sctp_ifa) {
2932                 atomic_add_int(&sctp_ifa->refcount, 1);
2933                 if (net) {
2934                         /* save off where the next one we will want */
2935                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2936                 }
2937                 return (sctp_ifa);
2938         }
2939         /*
2940          * plan_b: Look at all interfaces and find a preferred address. If
2941          * no preferred fall through to plan_c.
2942          */
2943 bound_all_plan_b:
2944         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2945         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2946                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2947                     sctp_ifn->ifn_name);
2948                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2949                         /* wrong base scope */
2950                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2951                         continue;
2952                 }
2953                 if ((sctp_ifn == looked_at) && looked_at) {
2954                         /* already looked at this guy */
2955                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2956                         continue;
2957                 }
2958                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2959                     dest_is_loop, dest_is_priv, fam);
2960                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2961                     "Found ifn:%p %d preferred source addresses\n",
2962                     ifn, num_preferred);
2963                 if (num_preferred == 0) {
2964                         /* None on this interface. */
2965                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2966                         continue;
2967                 }
2968                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2969                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2970                     num_preferred, (void *)sctp_ifn, cur_addr_num);
2971
2972                 /*
2973                  * Ok we have num_eligible_addr set with how many we can
2974                  * use, this may vary from call to call due to addresses
2975                  * being deprecated etc..
2976                  */
2977                 if (cur_addr_num >= num_preferred) {
2978                         cur_addr_num = 0;
2979                 }
2980                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2981                     dest_is_priv, cur_addr_num, fam, ro);
2982                 if (sifa == NULL)
2983                         continue;
2984                 if (net) {
2985                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2986                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2987                             cur_addr_num);
2988                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2989                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2990                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2991                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2992                 }
2993                 atomic_add_int(&sifa->refcount, 1);
2994                 return (sifa);
2995         }
2996 #ifdef INET
2997 again_with_private_addresses_allowed:
2998 #endif
2999         /* plan_c: do we have an acceptable address on the emit interface */
3000         sifa = NULL;
3001         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3002         if (emit_ifn == NULL) {
3003                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3004                 goto plan_d;
3005         }
3006         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3007                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3008                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3009                     (non_asoc_addr_ok == 0)) {
3010                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3011                         continue;
3012                 }
3013                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3014                     dest_is_priv, fam);
3015                 if (sifa == NULL) {
3016                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3017                         continue;
3018                 }
3019                 if (stcb) {
3020                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3021                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3022                                 sifa = NULL;
3023                                 continue;
3024                         }
3025                         if (((non_asoc_addr_ok == 0) &&
3026                             (sctp_is_addr_restricted(stcb, sifa))) ||
3027                             (non_asoc_addr_ok &&
3028                             (sctp_is_addr_restricted(stcb, sifa)) &&
3029                             (!sctp_is_addr_pending(stcb, sifa)))) {
3030                                 /*
3031                                  * It is restricted for some reason..
3032                                  * probably not yet added.
3033                                  */
3034                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3035                                 sifa = NULL;
3036                                 continue;
3037                         }
3038                 } else {
3039                         SCTP_PRINTF("Stcb is null - no print\n");
3040                 }
3041                 atomic_add_int(&sifa->refcount, 1);
3042                 goto out;
3043         }
3044 plan_d:
3045         /*
3046          * plan_d: We are in trouble. No preferred address on the emit
3047          * interface. And not even a preferred address on all interfaces. Go
3048          * out and see if we can find an acceptable address somewhere
3049          * amongst all interfaces.
3050          */
3051         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3052         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3053                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3054                         /* wrong base scope */
3055                         continue;
3056                 }
3057                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3058                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3059                             (non_asoc_addr_ok == 0))
3060                                 continue;
3061                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3062                             dest_is_loop,
3063                             dest_is_priv, fam);
3064                         if (sifa == NULL)
3065                                 continue;
3066                         if (stcb) {
3067                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3068                                         sifa = NULL;
3069                                         continue;
3070                                 }
3071                                 if (((non_asoc_addr_ok == 0) &&
3072                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3073                                     (non_asoc_addr_ok &&
3074                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3075                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3076                                         /*
3077                                          * It is restricted for some
3078                                          * reason.. probably not yet added.
3079                                          */
3080                                         sifa = NULL;
3081                                         continue;
3082                                 }
3083                         }
3084                         goto out;
3085                 }
3086         }
3087 #ifdef INET
3088         if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3089                 stcb->asoc.scope.ipv4_local_scope = 1;
3090                 retried = 1;
3091                 goto again_with_private_addresses_allowed;
3092         } else if (retried == 1) {
3093                 stcb->asoc.scope.ipv4_local_scope = 0;
3094         }
3095 #endif
3096 out:
3097 #ifdef INET
3098         if (sifa) {
3099                 if (retried == 1) {
3100                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3101                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3102                                         /* wrong base scope */
3103                                         continue;
3104                                 }
3105                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3106                                         struct sctp_ifa *tmp_sifa;
3107
3108                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3109                                             (non_asoc_addr_ok == 0))
3110                                                 continue;
3111                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3112                                             dest_is_loop,
3113                                             dest_is_priv, fam);
3114                                         if (tmp_sifa == NULL) {
3115                                                 continue;
3116                                         }
3117                                         if (tmp_sifa == sifa) {
3118                                                 continue;
3119                                         }
3120                                         if (stcb) {
3121                                                 if (sctp_is_address_in_scope(tmp_sifa,
3122                                                     &stcb->asoc.scope, 0) == 0) {
3123                                                         continue;
3124                                                 }
3125                                                 if (((non_asoc_addr_ok == 0) &&
3126                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3127                                                     (non_asoc_addr_ok &&
3128                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3129                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3130                                                         /*
3131                                                          * It is restricted
3132                                                          * for some reason..
3133                                                          * probably not yet
3134                                                          * added.
3135                                                          */
3136                                                         continue;
3137                                                 }
3138                                         }
3139                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3140                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3141                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3142                                         }
3143                                 }
3144                         }
3145                 }
3146                 atomic_add_int(&sifa->refcount, 1);
3147         }
3148 #endif
3149         return (sifa);
3150 }
3151
3152
3153
3154 /* tcb may be NULL */
3155 struct sctp_ifa *
3156 sctp_source_address_selection(struct sctp_inpcb *inp,
3157     struct sctp_tcb *stcb,
3158     sctp_route_t * ro,
3159     struct sctp_nets *net,
3160     int non_asoc_addr_ok, uint32_t vrf_id)
3161 {
3162         struct sctp_ifa *answer;
3163         uint8_t dest_is_priv, dest_is_loop;
3164         sa_family_t fam;
3165
3166 #ifdef INET
3167         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3168
3169 #endif
3170 #ifdef INET6
3171         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3172
3173 #endif
3174
3175         /**
3176          * Rules: - Find the route if needed, cache if I can. - Look at
3177          * interface address in route, Is it in the bound list. If so we
3178          * have the best source. - If not we must rotate amongst the
3179          * addresses.
3180          *
3181          * Cavets and issues
3182          *
3183          * Do we need to pay attention to scope. We can have a private address
3184          * or a global address we are sourcing or sending to. So if we draw
3185          * it out
3186          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3187          * For V4
3188          * ------------------------------------------
3189          *      source     *      dest  *  result
3190          * -----------------------------------------
3191          * <a>  Private    *    Global  *  NAT
3192          * -----------------------------------------
3193          * <b>  Private    *    Private *  No problem
3194          * -----------------------------------------
3195          * <c>  Global     *    Private *  Huh, How will this work?
3196          * -----------------------------------------
3197          * <d>  Global     *    Global  *  No Problem
3198          *------------------------------------------
3199          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3200          * For V6
3201          *------------------------------------------
3202          *      source     *      dest  *  result
3203          * -----------------------------------------
3204          * <a>  Linklocal  *    Global  *
3205          * -----------------------------------------
3206          * <b>  Linklocal  * Linklocal  *  No problem
3207          * -----------------------------------------
3208          * <c>  Global     * Linklocal  *  Huh, How will this work?
3209          * -----------------------------------------
3210          * <d>  Global     *    Global  *  No Problem
3211          *------------------------------------------
3212          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3213          *
3214          * And then we add to that what happens if there are multiple addresses
3215          * assigned to an interface. Remember the ifa on a ifn is a linked
3216          * list of addresses. So one interface can have more than one IP
3217          * address. What happens if we have both a private and a global
3218          * address? Do we then use context of destination to sort out which
3219          * one is best? And what about NAT's sending P->G may get you a NAT
3220          * translation, or should you select the G thats on the interface in
3221          * preference.
3222          *
3223          * Decisions:
3224          *
3225          * - count the number of addresses on the interface.
3226          * - if it is one, no problem except case <c>.
3227          *   For <a> we will assume a NAT out there.
3228          * - if there are more than one, then we need to worry about scope P
3229          *   or G. We should prefer G -> G and P -> P if possible.
3230          *   Then as a secondary fall back to mixed types G->P being a last
3231          *   ditch one.
3232          * - The above all works for bound all, but bound specific we need to
3233          *   use the same concept but instead only consider the bound
3234          *   addresses. If the bound set is NOT assigned to the interface then
3235          *   we must use rotation amongst the bound addresses..
3236          */
3237         if (ro->ro_rt == NULL) {
3238                 /*
3239                  * Need a route to cache.
3240                  */
3241                 SCTP_RTALLOC(ro, vrf_id);
3242         }
3243         if (ro->ro_rt == NULL) {
3244                 return (NULL);
3245         }
3246         fam = ro->ro_dst.sa_family;
3247         dest_is_priv = dest_is_loop = 0;
3248         /* Setup our scopes for the destination */
3249         switch (fam) {
3250 #ifdef INET
3251         case AF_INET:
3252                 /* Scope based on outbound address */
3253                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3254                         dest_is_loop = 1;
3255                         if (net != NULL) {
3256                                 /* mark it as local */
3257                                 net->addr_is_local = 1;
3258                         }
3259                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3260                         dest_is_priv = 1;
3261                 }
3262                 break;
3263 #endif
3264 #ifdef INET6
3265         case AF_INET6:
3266                 /* Scope based on outbound address */
3267                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3268                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3269                         /*
3270                          * If the address is a loopback address, which
3271                          * consists of "::1" OR "fe80::1%lo0", we are
3272                          * loopback scope. But we don't use dest_is_priv
3273                          * (link local addresses).
3274                          */
3275                         dest_is_loop = 1;
3276                         if (net != NULL) {
3277                                 /* mark it as local */
3278                                 net->addr_is_local = 1;
3279                         }
3280                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3281                         dest_is_priv = 1;
3282                 }
3283                 break;
3284 #endif
3285         }
3286         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3287         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3288         SCTP_IPI_ADDR_RLOCK();
3289         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3290                 /*
3291                  * Bound all case
3292                  */
3293                 answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3294                     dest_is_priv, dest_is_loop,
3295                     non_asoc_addr_ok, fam);
3296                 SCTP_IPI_ADDR_RUNLOCK();
3297                 return (answer);
3298         }
3299         /*
3300          * Subset bound case
3301          */
3302         if (stcb) {
3303                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3304                     vrf_id, dest_is_priv,
3305                     dest_is_loop,
3306                     non_asoc_addr_ok, fam);
3307         } else {
3308                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3309                     non_asoc_addr_ok,
3310                     dest_is_priv,
3311                     dest_is_loop, fam);
3312         }
3313         SCTP_IPI_ADDR_RUNLOCK();
3314         return (answer);
3315 }
3316
3317 static int
3318 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3319 {
3320         struct cmsghdr cmh;
3321         int tlen, at, found;
3322         struct sctp_sndinfo sndinfo;
3323         struct sctp_prinfo prinfo;
3324         struct sctp_authinfo authinfo;
3325
3326         tlen = SCTP_BUF_LEN(control);
3327         at = 0;
3328         found = 0;
3329         /*
3330          * Independent of how many mbufs, find the c_type inside the control
3331          * structure and copy out the data.
3332          */
3333         while (at < tlen) {
3334                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3335                         /* There is not enough room for one more. */
3336                         return (found);
3337                 }
3338                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3339                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3340                         /* We dont't have a complete CMSG header. */
3341                         return (found);
3342                 }
3343                 if (((int)cmh.cmsg_len + at) > tlen) {
3344                         /* We don't have the complete CMSG. */
3345                         return (found);
3346                 }
3347                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3348                     ((c_type == cmh.cmsg_type) ||
3349                     ((c_type == SCTP_SNDRCV) &&
3350                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3351                     (cmh.cmsg_type == SCTP_PRINFO) ||
3352                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3353                         if (c_type == cmh.cmsg_type) {
3354                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3355                                         return (found);
3356                                 }
3357                                 /* It is exactly what we want. Copy it out. */
3358                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3359                                 return (1);
3360                         } else {
3361                                 struct sctp_sndrcvinfo *sndrcvinfo;
3362
3363                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3364                                 if (found == 0) {
3365                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3366                                                 return (found);
3367                                         }
3368                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3369                                 }
3370                                 switch (cmh.cmsg_type) {
3371                                 case SCTP_SNDINFO:
3372                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3373                                                 return (found);
3374                                         }
3375                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3376                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3377                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3378                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3379                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3380                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3381                                         break;
3382                                 case SCTP_PRINFO:
3383                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3384                                                 return (found);
3385                                         }
3386                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3387                                         sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3388                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3389                                         break;
3390                                 case SCTP_AUTHINFO:
3391                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3392                                                 return (found);
3393                                         }
3394                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3395                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3396                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3397                                         break;
3398                                 default:
3399                                         return (found);
3400                                 }
3401                                 found = 1;
3402                         }
3403                 }
3404                 at += CMSG_ALIGN(cmh.cmsg_len);
3405         }
3406         return (found);
3407 }
3408
3409 static int
3410 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3411 {
3412         struct cmsghdr cmh;
3413         int tlen, at;
3414         struct sctp_initmsg initmsg;
3415
3416 #ifdef INET
3417         struct sockaddr_in sin;
3418
3419 #endif
3420 #ifdef INET6
3421         struct sockaddr_in6 sin6;
3422
3423 #endif
3424
3425         tlen = SCTP_BUF_LEN(control);
3426         at = 0;
3427         while (at < tlen) {
3428                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3429                         /* There is not enough room for one more. */
3430                         *error = EINVAL;
3431                         return (1);
3432                 }
3433                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3434                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3435                         /* We dont't have a complete CMSG header. */
3436                         *error = EINVAL;
3437                         return (1);
3438                 }
3439                 if (((int)cmh.cmsg_len + at) > tlen) {
3440                         /* We don't have the complete CMSG. */
3441                         *error = EINVAL;
3442                         return (1);
3443                 }
3444                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3445                         switch (cmh.cmsg_type) {
3446                         case SCTP_INIT:
3447                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3448                                         *error = EINVAL;
3449                                         return (1);
3450                                 }
3451                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3452                                 if (initmsg.sinit_max_attempts)
3453                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3454                                 if (initmsg.sinit_num_ostreams)
3455                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3456                                 if (initmsg.sinit_max_instreams)
3457                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3458                                 if (initmsg.sinit_max_init_timeo)
3459                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3460                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3461                                         struct sctp_stream_out *tmp_str;
3462                                         unsigned int i;
3463
3464                                         /* Default is NOT correct */
3465                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3466                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3467                                         SCTP_TCB_UNLOCK(stcb);
3468                                         SCTP_MALLOC(tmp_str,
3469                                             struct sctp_stream_out *,
3470                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3471                                             SCTP_M_STRMO);
3472                                         SCTP_TCB_LOCK(stcb);
3473                                         if (tmp_str != NULL) {
3474                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3475                                                 stcb->asoc.strmout = tmp_str;
3476                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3477                                         } else {
3478                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3479                                         }
3480                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3481                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3482                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3483                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3484                                                 stcb->asoc.strmout[i].stream_no = i;
3485                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3486                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3487                                         }
3488                                 }
3489                                 break;
3490 #ifdef INET
3491                         case SCTP_DSTADDRV4:
3492                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3493                                         *error = EINVAL;
3494                                         return (1);
3495                                 }
3496                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3497                                 sin.sin_family = AF_INET;
3498                                 sin.sin_len = sizeof(struct sockaddr_in);
3499                                 sin.sin_port = stcb->rport;
3500                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3501                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3502                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3503                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3504                                         *error = EINVAL;
3505                                         return (1);
3506                                 }
3507                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3508                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3509                                         *error = ENOBUFS;
3510                                         return (1);
3511                                 }
3512                                 break;
3513 #endif
3514 #ifdef INET6
3515                         case SCTP_DSTADDRV6:
3516                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3517                                         *error = EINVAL;
3518                                         return (1);
3519                                 }
3520                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3521                                 sin6.sin6_family = AF_INET6;
3522                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3523                                 sin6.sin6_port = stcb->rport;
3524                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3525                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3526                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3527                                         *error = EINVAL;
3528                                         return (1);
3529                                 }
3530 #ifdef INET
3531                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3532                                         in6_sin6_2_sin(&sin, &sin6);
3533                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3534                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3535                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3536                                                 *error = EINVAL;
3537                                                 return (1);
3538                                         }
3539                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3540                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3541                                                 *error = ENOBUFS;
3542                                                 return (1);
3543                                         }
3544                                 } else
3545 #endif
3546                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3547                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3548                                         *error = ENOBUFS;
3549                                         return (1);
3550                                 }
3551                                 break;
3552 #endif
3553                         default:
3554                                 break;
3555                         }
3556                 }
3557                 at += CMSG_ALIGN(cmh.cmsg_len);
3558         }
3559         return (0);
3560 }
3561
3562 static struct sctp_tcb *
3563 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3564     in_port_t port,
3565     struct mbuf *control,
3566     struct sctp_nets **net_p,
3567     int *error)
3568 {
3569         struct cmsghdr cmh;
3570         int tlen, at;
3571         struct sctp_tcb *stcb;
3572         struct sockaddr *addr;
3573
3574 #ifdef INET
3575         struct sockaddr_in sin;
3576
3577 #endif
3578 #ifdef INET6
3579         struct sockaddr_in6 sin6;
3580
3581 #endif
3582
3583         tlen = SCTP_BUF_LEN(control);
3584         at = 0;
3585         while (at < tlen) {
3586                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3587                         /* There is not enough room for one more. */
3588                         *error = EINVAL;
3589                         return (NULL);
3590                 }
3591                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3592                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3593                         /* We dont't have a complete CMSG header. */
3594                         *error = EINVAL;
3595                         return (NULL);
3596                 }
3597                 if (((int)cmh.cmsg_len + at) > tlen) {
3598                         /* We don't have the complete CMSG. */
3599                         *error = EINVAL;
3600                         return (NULL);
3601                 }
3602                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3603                         switch (cmh.cmsg_type) {
3604 #ifdef INET
3605                         case SCTP_DSTADDRV4:
3606                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3607                                         *error = EINVAL;
3608                                         return (NULL);
3609                                 }
3610                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3611                                 sin.sin_family = AF_INET;
3612                                 sin.sin_len = sizeof(struct sockaddr_in);
3613                                 sin.sin_port = port;
3614                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3615                                 addr = (struct sockaddr *)&sin;
3616                                 break;
3617 #endif
3618 #ifdef INET6
3619                         case SCTP_DSTADDRV6:
3620                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3621                                         *error = EINVAL;
3622                                         return (NULL);
3623                                 }
3624                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3625                                 sin6.sin6_family = AF_INET6;
3626                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3627                                 sin6.sin6_port = port;
3628                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3629 #ifdef INET
3630                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3631                                         in6_sin6_2_sin(&sin, &sin6);
3632                                         addr = (struct sockaddr *)&sin;
3633                                 } else
3634 #endif
3635                                         addr = (struct sockaddr *)&sin6;
3636                                 break;
3637 #endif
3638                         default:
3639                                 addr = NULL;
3640                                 break;
3641                         }
3642                         if (addr) {
3643                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3644                                 if (stcb != NULL) {
3645                                         return (stcb);
3646                                 }
3647                         }
3648                 }
3649                 at += CMSG_ALIGN(cmh.cmsg_len);
3650         }
3651         return (NULL);
3652 }
3653
3654 static struct mbuf *
3655 sctp_add_cookie(struct mbuf *init, int init_offset,
3656     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3657 {
3658         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3659         struct sctp_state_cookie *stc;
3660         struct sctp_paramhdr *ph;
3661         uint8_t *foo;
3662         int sig_offset;
3663         uint16_t cookie_sz;
3664
3665         mret = NULL;
3666         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3667             sizeof(struct sctp_paramhdr)), 0,
3668             M_DONTWAIT, 1, MT_DATA);
3669         if (mret == NULL) {
3670                 return (NULL);
3671         }
3672         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3673         if (copy_init == NULL) {
3674                 sctp_m_freem(mret);
3675                 return (NULL);
3676         }
3677 #ifdef SCTP_MBUF_LOGGING
3678         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3679                 struct mbuf *mat;
3680
3681                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3682                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3683                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3684                         }
3685                 }
3686         }
3687 #endif
3688         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3689             M_DONTWAIT);
3690         if (copy_initack == NULL) {
3691                 sctp_m_freem(mret);
3692                 sctp_m_freem(copy_init);
3693                 return (NULL);
3694         }
3695 #ifdef SCTP_MBUF_LOGGING
3696         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3697                 struct mbuf *mat;
3698
3699                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3700                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3701                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3702                         }
3703                 }
3704         }
3705 #endif
3706         /* easy side we just drop it on the end */
3707         ph = mtod(mret, struct sctp_paramhdr *);
3708         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3709             sizeof(struct sctp_paramhdr);
3710         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3711             sizeof(struct sctp_paramhdr));
3712         ph->param_type = htons(SCTP_STATE_COOKIE);
3713         ph->param_length = 0;   /* fill in at the end */
3714         /* Fill in the stc cookie data */
3715         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3716
3717         /* tack the INIT and then the INIT-ACK onto the chain */
3718         cookie_sz = 0;
3719         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3720                 cookie_sz += SCTP_BUF_LEN(m_at);
3721                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3722                         SCTP_BUF_NEXT(m_at) = copy_init;
3723                         break;
3724                 }
3725         }
3726         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3727                 cookie_sz += SCTP_BUF_LEN(m_at);
3728                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3729                         SCTP_BUF_NEXT(m_at) = copy_initack;
3730                         break;
3731                 }
3732         }
3733         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3734                 cookie_sz += SCTP_BUF_LEN(m_at);
3735                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3736                         break;
3737                 }
3738         }
3739         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3740         if (sig == NULL) {
3741                 /* no space, so free the entire chain */
3742                 sctp_m_freem(mret);
3743                 return (NULL);
3744         }
3745         SCTP_BUF_LEN(sig) = 0;
3746         SCTP_BUF_NEXT(m_at) = sig;
3747         sig_offset = 0;
3748         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3749         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3750         *signature = foo;
3751         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3752         cookie_sz += SCTP_SIGNATURE_SIZE;
3753         ph->param_length = htons(cookie_sz);
3754         return (mret);
3755 }
3756
3757
3758 static uint8_t
3759 sctp_get_ect(struct sctp_tcb *stcb)
3760 {
3761         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3762                 return (SCTP_ECT0_BIT);
3763         } else {
3764                 return (0);
3765         }
3766 }
3767
3768 #if defined(INET) || defined(INET6)
3769 static void
3770 sctp_handle_no_route(struct sctp_tcb *stcb,
3771     struct sctp_nets *net,
3772     int so_locked)
3773 {
3774         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3775
3776         if (net) {
3777                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3778                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3779                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3780                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3781                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3782                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3783                                     stcb, 0,
3784                                     (void *)net,
3785                                     so_locked);
3786                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3787                                 net->dest_state &= ~SCTP_ADDR_PF;
3788                         }
3789                 }
3790                 if (stcb) {
3791                         if (net == stcb->asoc.primary_destination) {
3792                                 /* need a new primary */
3793                                 struct sctp_nets *alt;
3794
3795                                 alt = sctp_find_alternate_net(stcb, net, 0);
3796                                 if (alt != net) {
3797                                         if (stcb->asoc.alternate) {
3798                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3799                                         }
3800                                         stcb->asoc.alternate = alt;
3801                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3802                                         if (net->ro._s_addr) {
3803                                                 sctp_free_ifa(net->ro._s_addr);
3804                                                 net->ro._s_addr = NULL;
3805                                         }
3806                                         net->src_addr_selected = 0;
3807                                 }
3808                         }
3809                 }
3810         }
3811 }
3812
3813 #endif
3814
3815 static int
3816 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3817     struct sctp_tcb *stcb,      /* may be NULL */
3818     struct sctp_nets *net,
3819     struct sockaddr *to,
3820     struct mbuf *m,
3821     uint32_t auth_offset,
3822     struct sctp_auth_chunk *auth,
3823     uint16_t auth_keyid,
3824     int nofragment_flag,
3825     int ecn_ok,
3826     int out_of_asoc_ok,
3827     uint16_t src_port,
3828     uint16_t dest_port,
3829     uint32_t v_tag,
3830     uint16_t port,
3831     union sctp_sockstore *over_addr,
3832     uint8_t use_mflowid, uint32_t mflowid,
3833 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3834     int so_locked SCTP_UNUSED
3835 #else
3836     int so_locked
3837 #endif
3838 )
3839 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3840 {
3841         /**
3842          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3843          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3844          * - fill in the HMAC digest of any AUTH chunk in the packet.
3845          * - calculate and fill in the SCTP checksum.
3846          * - prepend an IP address header.
3847          * - if boundall use INADDR_ANY.
3848          * - if boundspecific do source address selection.
3849          * - set fragmentation option for ipV4.
3850          * - On return from IP output, check/adjust mtu size of output
3851          *   interface and smallest_mtu size as well.
3852          */
3853         /* Will need ifdefs around this */
3854         struct mbuf *newm;
3855         struct sctphdr *sctphdr;
3856         int packet_length;
3857         int ret;
3858         uint32_t vrf_id;
3859
3860 #if defined(INET) || defined(INET6)
3861         struct mbuf *o_pak;
3862         sctp_route_t *ro = NULL;
3863         struct udphdr *udp = NULL;
3864
3865 #endif
3866         uint8_t tos_value;
3867
3868 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3869         struct socket *so = NULL;
3870
3871 #endif
3872
3873         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3874                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3875                 sctp_m_freem(m);
3876                 return (EFAULT);
3877         }
3878         if (stcb) {
3879                 vrf_id = stcb->asoc.vrf_id;
3880         } else {
3881                 vrf_id = inp->def_vrf_id;
3882         }
3883
3884         /* fill in the HMAC digest for any AUTH chunk in the packet */
3885         if ((auth != NULL) && (stcb != NULL)) {
3886                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3887         }
3888         if (net) {
3889                 tos_value = net->dscp;
3890         } else if (stcb) {
3891                 tos_value = stcb->asoc.default_dscp;
3892         } else {
3893                 tos_value = inp->sctp_ep.default_dscp;
3894         }
3895
3896         switch (to->sa_family) {
3897 #ifdef INET
3898         case AF_INET:
3899                 {
3900                         struct ip *ip = NULL;
3901                         sctp_route_t iproute;
3902                         int len;
3903
3904                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3905                         if (port) {
3906                                 len += sizeof(struct udphdr);
3907                         }
3908                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3909                         if (newm == NULL) {
3910                                 sctp_m_freem(m);
3911                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3912                                 return (ENOMEM);
3913                         }
3914                         SCTP_ALIGN_TO_END(newm, len);
3915                         SCTP_BUF_LEN(newm) = len;
3916                         SCTP_BUF_NEXT(newm) = m;
3917                         m = newm;
3918                         if (net != NULL) {
3919 #ifdef INVARIANTS
3920                                 if (net->flowidset == 0) {
3921                                         panic("Flow ID not set");
3922                                 }
3923 #endif
3924                                 m->m_pkthdr.flowid = net->flowid;
3925                                 m->m_flags |= M_FLOWID;
3926                         } else {
3927                                 if (use_mflowid != 0) {
3928                                         m->m_pkthdr.flowid = mflowid;
3929                                         m->m_flags |= M_FLOWID;
3930                                 }
3931                         }
3932                         packet_length = sctp_calculate_len(m);
3933                         ip = mtod(m, struct ip *);
3934                         ip->ip_v = IPVERSION;
3935                         ip->ip_hl = (sizeof(struct ip) >> 2);
3936                         if (tos_value == 0) {
3937                                 /*
3938                                  * This means especially, that it is not set
3939                                  * at the SCTP layer. So use the value from
3940                                  * the IP layer.
3941                                  */
3942                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3943                         }
3944                         tos_value &= 0xfc;
3945                         if (ecn_ok) {
3946                                 tos_value |= sctp_get_ect(stcb);
3947                         }
3948                         if ((nofragment_flag) && (port == 0)) {
3949                                 ip->ip_off = IP_DF;
3950                         } else {
3951                                 ip->ip_off = 0;
3952                         }
3953                         /* FreeBSD has a function for ip_id's */
3954                         ip->ip_id = ip_newid();
3955
3956                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3957                         ip->ip_len = packet_length;
3958                         ip->ip_tos = tos_value;
3959                         if (port) {
3960                                 ip->ip_p = IPPROTO_UDP;
3961                         } else {
3962                                 ip->ip_p = IPPROTO_SCTP;
3963                         }
3964                         ip->ip_sum = 0;
3965                         if (net == NULL) {
3966                                 ro = &iproute;
3967                                 memset(&iproute, 0, sizeof(iproute));
3968                                 memcpy(&ro->ro_dst, to, to->sa_len);
3969                         } else {
3970                                 ro = (sctp_route_t *) & net->ro;
3971                         }
3972                         /* Now the address selection part */
3973                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3974
3975                         /* call the routine to select the src address */
3976                         if (net && out_of_asoc_ok == 0) {
3977                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3978                                         sctp_free_ifa(net->ro._s_addr);
3979                                         net->ro._s_addr = NULL;
3980                                         net->src_addr_selected = 0;
3981                                         if (ro->ro_rt) {
3982                                                 RTFREE(ro->ro_rt);
3983                                                 ro->ro_rt = NULL;
3984                                         }
3985                                 }
3986                                 if (net->src_addr_selected == 0) {
3987                                         /* Cache the source address */
3988                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3989                                             ro, net, 0,
3990                                             vrf_id);
3991                                         net->src_addr_selected = 1;
3992                                 }
3993                                 if (net->ro._s_addr == NULL) {
3994                                         /* No route to host */
3995                                         net->src_addr_selected = 0;
3996                                         sctp_handle_no_route(stcb, net, so_locked);
3997                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3998                                         sctp_m_freem(m);
3999                                         return (EHOSTUNREACH);
4000                                 }
4001                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4002                         } else {
4003                                 if (over_addr == NULL) {
4004                                         struct sctp_ifa *_lsrc;
4005
4006                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4007                                             net,
4008                                             out_of_asoc_ok,
4009                                             vrf_id);
4010                                         if (_lsrc == NULL) {
4011                                                 sctp_handle_no_route(stcb, net, so_locked);
4012                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4013                                                 sctp_m_freem(m);
4014                                                 return (EHOSTUNREACH);
4015                                         }
4016                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4017                                         sctp_free_ifa(_lsrc);
4018                                 } else {
4019                                         ip->ip_src = over_addr->sin.sin_addr;
4020                                         SCTP_RTALLOC(ro, vrf_id);
4021                                 }
4022                         }
4023                         if (port) {
4024                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4025                                         sctp_handle_no_route(stcb, net, so_locked);
4026                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4027                                         sctp_m_freem(m);
4028                                         return (EHOSTUNREACH);
4029                                 }
4030                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4031                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4032                                 udp->uh_dport = port;
4033                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4034                                 if (V_udp_cksum) {
4035                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4036                                 } else {
4037                                         udp->uh_sum = 0;
4038                                 }
4039                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4040                         } else {
4041                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4042                         }
4043
4044                         sctphdr->src_port = src_port;
4045                         sctphdr->dest_port = dest_port;
4046                         sctphdr->v_tag = v_tag;
4047                         sctphdr->checksum = 0;
4048
4049                         /*
4050                          * If source address selection fails and we find no
4051                          * route then the ip_output should fail as well with
4052                          * a NO_ROUTE_TO_HOST type error. We probably should
4053                          * catch that somewhere and abort the association
4054                          * right away (assuming this is an INIT being sent).
4055                          */
4056                         if (ro->ro_rt == NULL) {
4057                                 /*
4058                                  * src addr selection failed to find a route
4059                                  * (or valid source addr), so we can't get
4060                                  * there from here (yet)!
4061                                  */
4062                                 sctp_handle_no_route(stcb, net, so_locked);
4063                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4064                                 sctp_m_freem(m);
4065                                 return (EHOSTUNREACH);
4066                         }
4067                         if (ro != &iproute) {
4068                                 memcpy(&iproute, ro, sizeof(*ro));
4069                         }
4070                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4071                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4072                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4073                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4074                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4075                             (void *)ro->ro_rt);
4076
4077                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4078                                 /* failed to prepend data, give up */
4079                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4080                                 sctp_m_freem(m);
4081                                 return (ENOMEM);
4082                         }
4083                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4084                         if (port) {
4085 #if defined(SCTP_WITH_NO_CSUM)
4086                                 SCTP_STAT_INCR(sctps_sendnocrc);
4087 #else
4088                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4089                                 SCTP_STAT_INCR(sctps_sendswcrc);
4090 #endif
4091                                 if (V_udp_cksum) {
4092                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4093                                 }
4094                         } else {
4095 #if defined(SCTP_WITH_NO_CSUM)
4096                                 SCTP_STAT_INCR(sctps_sendnocrc);
4097 #else
4098                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4099                                 m->m_pkthdr.csum_data = 0;
4100                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4101 #endif
4102                         }
4103 #ifdef SCTP_PACKET_LOGGING
4104                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4105                                 sctp_packet_log(o_pak);
4106 #endif
4107                         /* send it out.  table id is taken from stcb */
4108 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4109                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4110                                 so = SCTP_INP_SO(inp);
4111                                 SCTP_SOCKET_UNLOCK(so, 0);
4112                         }
4113 #endif
4114                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4115 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4116                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4117                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4118                                 SCTP_TCB_UNLOCK(stcb);
4119                                 SCTP_SOCKET_LOCK(so, 0);
4120                                 SCTP_TCB_LOCK(stcb);
4121                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4122                         }
4123 #endif
4124                         SCTP_STAT_INCR(sctps_sendpackets);
4125                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4126                         if (ret)
4127                                 SCTP_STAT_INCR(sctps_senderrors);
4128
4129                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4130                         if (net == NULL) {
4131                                 /* free tempy routes */
4132                                 RO_RTFREE(ro);
4133                         } else {
4134                                 /*
4135                                  * PMTU check versus smallest asoc MTU goes
4136                                  * here
4137                                  */
4138                                 if ((ro->ro_rt != NULL) &&
4139                                     (net->ro._s_addr)) {
4140                                         uint32_t mtu;
4141
4142                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4143                                         if (net->port) {
4144                                                 mtu -= sizeof(struct udphdr);
4145                                         }
4146                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4147                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4148                                                 net->mtu = mtu;
4149                                         }
4150                                 } else if (ro->ro_rt == NULL) {
4151                                         /* route was freed */
4152                                         if (net->ro._s_addr &&
4153                                             net->src_addr_selected) {
4154                                                 sctp_free_ifa(net->ro._s_addr);
4155                                                 net->ro._s_addr = NULL;
4156                                         }
4157                                         net->src_addr_selected = 0;
4158                                 }
4159                         }
4160                         return (ret);
4161                 }
4162 #endif
4163 #ifdef INET6
4164         case AF_INET6:
4165                 {
4166                         uint32_t flowlabel, flowinfo;
4167                         struct ip6_hdr *ip6h;
4168                         struct route_in6 ip6route;
4169                         struct ifnet *ifp;
4170                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4171                         int prev_scope = 0;
4172                         struct sockaddr_in6 lsa6_storage;
4173                         int error;
4174                         u_short prev_port = 0;
4175                         int len;
4176
4177                         if (net) {
4178                                 flowlabel = net->flowlabel;
4179                         } else if (stcb) {
4180                                 flowlabel = stcb->asoc.default_flowlabel;
4181                         } else {
4182                                 flowlabel = inp->sctp_ep.default_flowlabel;
4183                         }
4184                         if (flowlabel == 0) {
4185                                 /*
4186                                  * This means especially, that it is not set
4187                                  * at the SCTP layer. So use the value from
4188                                  * the IP layer.
4189                                  */
4190                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4191                         }
4192                         flowlabel &= 0x000fffff;
4193                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4194                         if (port) {
4195                                 len += sizeof(struct udphdr);
4196                         }
4197                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4198                         if (newm == NULL) {
4199                                 sctp_m_freem(m);
4200                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4201                                 return (ENOMEM);
4202                         }
4203                         SCTP_ALIGN_TO_END(newm, len);
4204                         SCTP_BUF_LEN(newm) = len;
4205                         SCTP_BUF_NEXT(newm) = m;
4206                         m = newm;
4207                         if (net != NULL) {
4208 #ifdef INVARIANTS
4209                                 if (net->flowidset == 0) {
4210                                         panic("Flow ID not set");
4211                                 }
4212 #endif
4213                                 m->m_pkthdr.flowid = net->flowid;
4214                                 m->m_flags |= M_FLOWID;
4215                         } else {
4216                                 if (use_mflowid != 0) {
4217                                         m->m_pkthdr.flowid = mflowid;
4218                                         m->m_flags |= M_FLOWID;
4219                                 }
4220                         }
4221                         packet_length = sctp_calculate_len(m);
4222
4223                         ip6h = mtod(m, struct ip6_hdr *);
4224                         /* protect *sin6 from overwrite */
4225                         sin6 = (struct sockaddr_in6 *)to;
4226                         tmp = *sin6;
4227                         sin6 = &tmp;
4228
4229                         /* KAME hack: embed scopeid */
4230                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4231                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4232                                 return (EINVAL);
4233                         }
4234                         if (net == NULL) {
4235                                 memset(&ip6route, 0, sizeof(ip6route));
4236                                 ro = (sctp_route_t *) & ip6route;
4237                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4238                         } else {
4239                                 ro = (sctp_route_t *) & net->ro;
4240                         }
4241                         /*
4242                          * We assume here that inp_flow is in host byte
4243                          * order within the TCB!
4244                          */
4245                         if (tos_value == 0) {
4246                                 /*
4247                                  * This means especially, that it is not set
4248                                  * at the SCTP layer. So use the value from
4249                                  * the IP layer.
4250                                  */
4251                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4252                         }
4253                         tos_value &= 0xfc;
4254                         if (ecn_ok) {
4255                                 tos_value |= sctp_get_ect(stcb);
4256                         }
4257                         flowinfo = 0x06;
4258                         flowinfo <<= 8;
4259                         flowinfo |= tos_value;
4260                         flowinfo <<= 20;
4261                         flowinfo |= flowlabel;
4262                         ip6h->ip6_flow = htonl(flowinfo);
4263                         if (port) {
4264                                 ip6h->ip6_nxt = IPPROTO_UDP;
4265                         } else {
4266                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4267                         }
4268                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4269                         ip6h->ip6_dst = sin6->sin6_addr;
4270
4271                         /*
4272                          * Add SRC address selection here: we can only reuse
4273                          * to a limited degree the kame src-addr-sel, since
4274                          * we can try their selection but it may not be
4275                          * bound.
4276                          */
4277                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4278                         lsa6_tmp.sin6_family = AF_INET6;
4279                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4280                         lsa6 = &lsa6_tmp;
4281                         if (net && out_of_asoc_ok == 0) {
4282                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4283                                         sctp_free_ifa(net->ro._s_addr);
4284                                         net->ro._s_addr = NULL;
4285                                         net->src_addr_selected = 0;
4286                                         if (ro->ro_rt) {
4287                                                 RTFREE(ro->ro_rt);
4288                                                 ro->ro_rt = NULL;
4289                                         }
4290                                 }
4291                                 if (net->src_addr_selected == 0) {
4292                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4293                                         /* KAME hack: embed scopeid */
4294                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4295                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4296                                                 return (EINVAL);
4297                                         }
4298                                         /* Cache the source address */
4299                                         net->ro._s_addr = sctp_source_address_selection(inp,
4300                                             stcb,
4301                                             ro,
4302                                             net,
4303                                             0,
4304                                             vrf_id);
4305                                         (void)sa6_recoverscope(sin6);
4306                                         net->src_addr_selected = 1;
4307                                 }
4308                                 if (net->ro._s_addr == NULL) {
4309                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4310                                         net->src_addr_selected = 0;
4311                                         sctp_handle_no_route(stcb, net, so_locked);
4312                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4313                                         sctp_m_freem(m);
4314                                         return (EHOSTUNREACH);
4315                                 }
4316                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4317                         } else {
4318                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4319                                 /* KAME hack: embed scopeid */
4320                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4321                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4322                                         return (EINVAL);
4323                                 }
4324                                 if (over_addr == NULL) {
4325                                         struct sctp_ifa *_lsrc;
4326
4327                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4328                                             net,
4329                                             out_of_asoc_ok,
4330                                             vrf_id);
4331                                         if (_lsrc == NULL) {
4332                                                 sctp_handle_no_route(stcb, net, so_locked);
4333                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4334                                                 sctp_m_freem(m);
4335                                                 return (EHOSTUNREACH);
4336                                         }
4337                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4338                                         sctp_free_ifa(_lsrc);
4339                                 } else {
4340                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4341                                         SCTP_RTALLOC(ro, vrf_id);
4342                                 }
4343                                 (void)sa6_recoverscope(sin6);
4344                         }
4345                         lsa6->sin6_port = inp->sctp_lport;
4346
4347                         if (ro->ro_rt == NULL) {
4348                                 /*
4349                                  * src addr selection failed to find a route
4350                                  * (or valid source addr), so we can't get
4351                                  * there from here!
4352                                  */
4353                                 sctp_handle_no_route(stcb, net, so_locked);
4354                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4355                                 sctp_m_freem(m);
4356                                 return (EHOSTUNREACH);
4357                         }
4358                         /*
4359                          * XXX: sa6 may not have a valid sin6_scope_id in
4360                          * the non-SCOPEDROUTING case.
4361                          */
4362                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4363                         lsa6_storage.sin6_family = AF_INET6;
4364                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4365                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4366                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4367                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4368                                 sctp_m_freem(m);
4369                                 return (error);
4370                         }
4371                         /* XXX */
4372                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4373                         lsa6_storage.sin6_port = inp->sctp_lport;
4374                         lsa6 = &lsa6_storage;
4375                         ip6h->ip6_src = lsa6->sin6_addr;
4376
4377                         if (port) {
4378                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4379                                         sctp_handle_no_route(stcb, net, so_locked);
4380                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4381                                         sctp_m_freem(m);
4382                                         return (EHOSTUNREACH);
4383                                 }
4384                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4385                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4386                                 udp->uh_dport = port;
4387                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4388                                 udp->uh_sum = 0;
4389                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4390                         } else {
4391                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4392                         }
4393
4394                         sctphdr->src_port = src_port;
4395                         sctphdr->dest_port = dest_port;
4396                         sctphdr->v_tag = v_tag;
4397                         sctphdr->checksum = 0;
4398
4399                         /*
4400                          * We set the hop limit now since there is a good
4401                          * chance that our ro pointer is now filled
4402                          */
4403                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4404                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4405
4406 #ifdef SCTP_DEBUG
4407                         /* Copy to be sure something bad is not happening */
4408                         sin6->sin6_addr = ip6h->ip6_dst;
4409                         lsa6->sin6_addr = ip6h->ip6_src;
4410 #endif
4411
4412                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4413                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4414                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4415                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4416                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4417                         if (net) {
4418                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4419                                 /*
4420                                  * preserve the port and scope for link
4421                                  * local send
4422                                  */
4423                                 prev_scope = sin6->sin6_scope_id;
4424                                 prev_port = sin6->sin6_port;
4425                         }
4426                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4427                                 /* failed to prepend data, give up */
4428                                 sctp_m_freem(m);
4429                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4430                                 return (ENOMEM);
4431                         }
4432                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4433                         if (port) {
4434 #if defined(SCTP_WITH_NO_CSUM)
4435                                 SCTP_STAT_INCR(sctps_sendnocrc);
4436 #else
4437                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4438                                 SCTP_STAT_INCR(sctps_sendswcrc);
4439 #endif
4440                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4441                                         udp->uh_sum = 0xffff;
4442                                 }
4443                         } else {
4444 #if defined(SCTP_WITH_NO_CSUM)
4445                                 SCTP_STAT_INCR(sctps_sendnocrc);
4446 #else
4447                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4448                                 m->m_pkthdr.csum_data = 0;
4449                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4450 #endif
4451                         }
4452                         /* send it out. table id is taken from stcb */
4453 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4454                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4455                                 so = SCTP_INP_SO(inp);
4456                                 SCTP_SOCKET_UNLOCK(so, 0);
4457                         }
4458 #endif
4459 #ifdef SCTP_PACKET_LOGGING
4460                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4461                                 sctp_packet_log(o_pak);
4462 #endif
4463                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4464 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4465                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4466                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4467                                 SCTP_TCB_UNLOCK(stcb);
4468                                 SCTP_SOCKET_LOCK(so, 0);
4469                                 SCTP_TCB_LOCK(stcb);
4470                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4471                         }
4472 #endif
4473                         if (net) {
4474                                 /* for link local this must be done */
4475                                 sin6->sin6_scope_id = prev_scope;
4476                                 sin6->sin6_port = prev_port;
4477                         }
4478                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4479                         SCTP_STAT_INCR(sctps_sendpackets);
4480                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4481                         if (ret) {
4482                                 SCTP_STAT_INCR(sctps_senderrors);
4483                         }
4484                         if (net == NULL) {
4485                                 /* Now if we had a temp route free it */
4486                                 RO_RTFREE(ro);
4487                         } else {
4488                                 /*
4489                                  * PMTU check versus smallest asoc MTU goes
4490                                  * here
4491                                  */
4492                                 if (ro->ro_rt == NULL) {
4493                                         /* Route was freed */
4494                                         if (net->ro._s_addr &&
4495                                             net->src_addr_selected) {
4496                                                 sctp_free_ifa(net->ro._s_addr);
4497                                                 net->ro._s_addr = NULL;
4498                                         }
4499                                         net->src_addr_selected = 0;
4500                                 }
4501                                 if ((ro->ro_rt != NULL) &&
4502                                     (net->ro._s_addr)) {
4503                                         uint32_t mtu;
4504
4505                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4506                                         if (mtu &&
4507                                             (stcb->asoc.smallest_mtu > mtu)) {
4508                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4509                                                 net->mtu = mtu;
4510                                                 if (net->port) {
4511                                                         net->mtu -= sizeof(struct udphdr);
4512                                                 }
4513                                         }
4514                                 } else if (ifp) {
4515                                         if (ND_IFINFO(ifp)->linkmtu &&
4516                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4517                                                 sctp_mtu_size_reset(inp,
4518                                                     &stcb->asoc,
4519                                                     ND_IFINFO(ifp)->linkmtu);
4520                                         }
4521                                 }
4522                         }
4523                         return (ret);
4524                 }
4525 #endif
4526         default:
4527                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4528                     ((struct sockaddr *)to)->sa_family);
4529                 sctp_m_freem(m);
4530                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4531                 return (EFAULT);
4532         }
4533 }
4534
4535
4536 void
4537 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4538 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4539     SCTP_UNUSED
4540 #endif
4541 )
4542 {
4543         struct mbuf *m;
4544         struct sctp_nets *net;
4545         struct sctp_init_chunk *init;
4546
4547 #if defined(INET) || defined(INET6)
4548         struct sctp_supported_addr_param *sup_addr;
4549
4550 #endif
4551         struct sctp_adaptation_layer_indication *ali;
4552         struct sctp_supported_chunk_types_param *pr_supported;
4553         struct sctp_paramhdr *ph;
4554         int cnt_inits_to = 0;
4555         int ret;
4556         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4557
4558         /* INIT's always go to the primary (and usually ONLY address) */
4559         net = stcb->asoc.primary_destination;
4560         if (net == NULL) {
4561                 net = TAILQ_FIRST(&stcb->asoc.nets);
4562                 if (net == NULL) {
4563                         /* TSNH */
4564                         return;
4565                 }
4566                 /* we confirm any address we send an INIT to */
4567                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4568                 (void)sctp_set_primary_addr(stcb, NULL, net);
4569         } else {
4570                 /* we confirm any address we send an INIT to */
4571                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4572         }
4573         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4574 #ifdef INET6
4575         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4576                 /*
4577                  * special hook, if we are sending to link local it will not
4578                  * show up in our private address count.
4579                  */
4580                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4581                         cnt_inits_to = 1;
4582         }
4583 #endif
4584         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4585                 /* This case should not happen */
4586                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4587                 return;
4588         }
4589         /* start the INIT timer */
4590         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4591
4592         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4593         if (m == NULL) {
4594                 /* No memory, INIT timer will re-attempt. */
4595                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4596                 return;
4597         }
4598         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4599         padding_len = 0;
4600         /*
4601          * assume peer supports asconf in order to be able to queue local
4602          * address changes while an INIT is in flight and before the assoc
4603          * is established.
4604          */
4605         stcb->asoc.peer_supports_asconf = 1;
4606         /* Now lets put the chunk header in place */
4607         init = mtod(m, struct sctp_init_chunk *);
4608         /* now the chunk header */
4609         init->ch.chunk_type = SCTP_INITIATION;
4610         init->ch.chunk_flags = 0;
4611         /* fill in later from mbuf we build */
4612         init->ch.chunk_length = 0;
4613         /* place in my tag */
4614         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4615         /* set up some of the credits. */
4616         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4617             SCTP_MINIMAL_RWND));
4618         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4619         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4620         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4621
4622         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4623                 uint8_t i;
4624
4625                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4626                 if (stcb->asoc.scope.ipv4_addr_legal) {
4627                         parameter_len += (uint16_t) sizeof(uint16_t);
4628                 }
4629                 if (stcb->asoc.scope.ipv6_addr_legal) {
4630                         parameter_len += (uint16_t) sizeof(uint16_t);
4631                 }
4632                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4633                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4634                 sup_addr->ph.param_length = htons(parameter_len);
4635                 i = 0;
4636                 if (stcb->asoc.scope.ipv4_addr_legal) {
4637                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4638                 }
4639                 if (stcb->asoc.scope.ipv6_addr_legal) {
4640                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4641                 }
4642                 padding_len = 4 - 2 * i;
4643                 chunk_len += parameter_len;
4644         }
4645         /* Adaptation layer indication parameter */
4646         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4647                 if (padding_len > 0) {
4648                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4649                         chunk_len += padding_len;
4650                         padding_len = 0;
4651                 }
4652                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4653                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4654                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4655                 ali->ph.param_length = htons(parameter_len);
4656                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4657                 chunk_len += parameter_len;
4658         }
4659         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4660                 /* Add NAT friendly parameter. */
4661                 if (padding_len > 0) {
4662                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4663                         chunk_len += padding_len;
4664                         padding_len = 0;
4665                 }
4666                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4667                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4668                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4669                 ph->param_length = htons(parameter_len);
4670                 chunk_len += parameter_len;
4671         }
4672         /* now any cookie time extensions */
4673         if (stcb->asoc.cookie_preserve_req) {
4674                 struct sctp_cookie_perserve_param *cookie_preserve;
4675
4676                 if (padding_len > 0) {
4677                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4678                         chunk_len += padding_len;
4679                         padding_len = 0;
4680                 }
4681                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4682                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4683                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4684                 cookie_preserve->ph.param_length = htons(parameter_len);
4685                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4686                 stcb->asoc.cookie_preserve_req = 0;
4687                 chunk_len += parameter_len;
4688         }
4689         /* ECN parameter */
4690         if (stcb->asoc.ecn_allowed == 1) {
4691                 if (padding_len > 0) {
4692                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4693                         chunk_len += padding_len;
4694                         padding_len = 0;
4695                 }
4696                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4697                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4698                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4699                 ph->param_length = htons(parameter_len);
4700                 chunk_len += parameter_len;
4701         }
4702         /* And now tell the peer we do support PR-SCTP. */
4703         if (padding_len > 0) {
4704                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4705                 chunk_len += padding_len;
4706                 padding_len = 0;
4707         }
4708         parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4709         ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4710         ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4711         ph->param_length = htons(parameter_len);
4712         chunk_len += parameter_len;
4713
4714         /* And now tell the peer we do all the extensions */
4715         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4716         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4717         num_ext = 0;
4718         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4719         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4720         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4721         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4722         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4723         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4724                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4725         }
4726         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4727                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4728         }
4729         parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4730         pr_supported->ph.param_length = htons(parameter_len);
4731         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4732         chunk_len += parameter_len;
4733
4734         /* add authentication parameters */
4735         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4736                 /* attach RANDOM parameter, if available */
4737                 if (stcb->asoc.authinfo.random != NULL) {
4738                         struct sctp_auth_random *randp;
4739
4740                         if (padding_len > 0) {
4741                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4742                                 chunk_len += padding_len;
4743                                 padding_len = 0;
4744                         }
4745                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4746                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4747                         /* random key already contains the header */
4748                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4749                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4750                         chunk_len += parameter_len;
4751                 }
4752                 /* add HMAC_ALGO parameter */
4753                 if ((stcb->asoc.local_hmacs != NULL) &&
4754                     (stcb->asoc.local_hmacs->num_algo > 0)) {
4755                         struct sctp_auth_hmac_algo *hmacs;
4756
4757                         if (padding_len > 0) {
4758                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4759                                 chunk_len += padding_len;
4760                                 padding_len = 0;
4761                         }
4762                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4763                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4764                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4765                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4766                         hmacs->ph.param_length = htons(parameter_len);
4767                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4768                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4769                         chunk_len += parameter_len;
4770                 }
4771                 /* add CHUNKS parameter */
4772                 if (sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks) > 0) {
4773                         struct sctp_auth_chunk_list *chunks;
4774
4775                         if (padding_len > 0) {
4776                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4777                                 chunk_len += padding_len;
4778                                 padding_len = 0;
4779                         }
4780                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4781                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4782                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4783                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4784                         chunks->ph.param_length = htons(parameter_len);
4785                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4786                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4787                         chunk_len += parameter_len;
4788                 }
4789         }
4790         SCTP_BUF_LEN(m) = chunk_len;
4791
4792         /* now the addresses */
4793         /*
4794          * To optimize this we could put the scoping stuff into a structure
4795          * and remove the individual uint8's from the assoc structure. Then
4796          * we could just sifa in the address within the stcb. But for now
4797          * this is a quick hack to get the address stuff teased apart.
4798          */
4799         sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope, m, cnt_inits_to, &padding_len, &chunk_len);
4800
4801         init->ch.chunk_length = htons(chunk_len);
4802         if (padding_len > 0) {
4803                 struct mbuf *m_at, *mp_last;
4804
4805                 mp_last = NULL;
4806                 for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4807                         if (SCTP_BUF_NEXT(m_at) == NULL)
4808                                 mp_last = m_at;
4809                 }
4810                 if ((mp_last == NULL) || sctp_add_pad_tombuf(mp_last, padding_len)) {
4811                         sctp_m_freem(m);
4812                         return;
4813                 }
4814         }
4815         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4816         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4817             (struct sockaddr *)&net->ro._l_addr,
4818             m, 0, NULL, 0, 0, 0, 0,
4819             inp->sctp_lport, stcb->rport, htonl(0),
4820             net->port, NULL,
4821             0, 0,
4822             so_locked);
4823         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4824         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4825         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4826 }
4827
4828 struct mbuf *
4829 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4830     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4831 {
4832         /*
4833          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4834          * being equal to the beginning of the params i.e. (iphlen +
4835          * sizeof(struct sctp_init_msg) parse through the parameters to the
4836          * end of the mbuf verifying that all parameters are known.
4837          *
4838          * For unknown parameters build and return a mbuf with
4839          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4840          * processing this chunk stop, and set *abort_processing to 1.
4841          *
4842          * By having param_offset be pre-set to where parameters begin it is
4843          * hoped that this routine may be reused in the future by new
4844          * features.
4845          */
4846         struct sctp_paramhdr *phdr, params;
4847
4848         struct mbuf *mat, *op_err;
4849         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4850         int at, limit, pad_needed;
4851         uint16_t ptype, plen, padded_size;
4852         int err_at;
4853
4854         *abort_processing = 0;
4855         mat = in_initpkt;
4856         err_at = 0;
4857         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4858         at = param_offset;
4859         op_err = NULL;
4860         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4861         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4862         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4863                 ptype = ntohs(phdr->param_type);
4864                 plen = ntohs(phdr->param_length);
4865                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4866                         /* wacked parameter */
4867                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4868                         goto invalid_size;
4869                 }
4870                 limit -= SCTP_SIZE32(plen);
4871                 /*-
4872                  * All parameters for all chunks that we know/understand are
4873                  * listed here. We process them other places and make
4874                  * appropriate stop actions per the upper bits. However this
4875                  * is the generic routine processor's can call to get back
4876                  * an operr.. to either incorporate (init-ack) or send.
4877                  */
4878                 padded_size = SCTP_SIZE32(plen);
4879                 switch (ptype) {
4880                         /* Param's with variable size */
4881                 case SCTP_HEARTBEAT_INFO:
4882                 case SCTP_STATE_COOKIE:
4883                 case SCTP_UNRECOG_PARAM:
4884                 case SCTP_ERROR_CAUSE_IND:
4885                         /* ok skip fwd */
4886                         at += padded_size;
4887                         break;
4888                         /* Param's with variable size within a range */
4889                 case SCTP_CHUNK_LIST:
4890                 case SCTP_SUPPORTED_CHUNK_EXT:
4891                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4892                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4893                                 goto invalid_size;
4894                         }
4895                         at += padded_size;
4896                         break;
4897                 case SCTP_SUPPORTED_ADDRTYPE:
4898                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4899                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4900                                 goto invalid_size;
4901                         }
4902                         at += padded_size;
4903                         break;
4904                 case SCTP_RANDOM:
4905                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4906                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4907                                 goto invalid_size;
4908                         }
4909                         at += padded_size;
4910                         break;
4911                 case SCTP_SET_PRIM_ADDR:
4912                 case SCTP_DEL_IP_ADDRESS:
4913                 case SCTP_ADD_IP_ADDRESS:
4914                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4915                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4916                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4917                                 goto invalid_size;
4918                         }
4919                         at += padded_size;
4920                         break;
4921                         /* Param's with a fixed size */
4922                 case SCTP_IPV4_ADDRESS:
4923                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4924                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4925                                 goto invalid_size;
4926                         }
4927                         at += padded_size;
4928                         break;
4929                 case SCTP_IPV6_ADDRESS:
4930                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4931                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4932                                 goto invalid_size;
4933                         }
4934                         at += padded_size;
4935                         break;
4936                 case SCTP_COOKIE_PRESERVE:
4937                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4938                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4939                                 goto invalid_size;
4940                         }
4941                         at += padded_size;
4942                         break;
4943                 case SCTP_HAS_NAT_SUPPORT:
4944                         *nat_friendly = 1;
4945                         /* fall through */
4946                 case SCTP_PRSCTP_SUPPORTED:
4947
4948                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4949                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4950                                 goto invalid_size;
4951                         }
4952                         at += padded_size;
4953                         break;
4954                 case SCTP_ECN_CAPABLE:
4955                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4956                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4957                                 goto invalid_size;
4958                         }
4959                         at += padded_size;
4960                         break;
4961                 case SCTP_ULP_ADAPTATION:
4962                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4963                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4964                                 goto invalid_size;
4965                         }
4966                         at += padded_size;
4967                         break;
4968                 case SCTP_SUCCESS_REPORT:
4969                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4970                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4971                                 goto invalid_size;
4972                         }
4973                         at += padded_size;
4974                         break;
4975                 case SCTP_HOSTNAME_ADDRESS:
4976                         {
4977                                 /* We can NOT handle HOST NAME addresses!! */
4978                                 int l_len;
4979
4980                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4981                                 *abort_processing = 1;
4982                                 if (op_err == NULL) {
4983                                         /* Ok need to try to get a mbuf */
4984 #ifdef INET6
4985                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4986 #else
4987                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4988 #endif
4989                                         l_len += plen;
4990                                         l_len += sizeof(struct sctp_paramhdr);
4991                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4992                                         if (op_err) {
4993                                                 SCTP_BUF_LEN(op_err) = 0;
4994                                                 /*
4995                                                  * pre-reserve space for ip
4996                                                  * and sctp header  and
4997                                                  * chunk hdr
4998                                                  */
4999 #ifdef INET6
5000                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5001 #else
5002                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5003 #endif
5004                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5005                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5006                                         }
5007                                 }
5008                                 if (op_err) {
5009                                         /* If we have space */
5010                                         struct sctp_paramhdr s;
5011
5012                                         if (err_at % 4) {
5013                                                 uint32_t cpthis = 0;
5014
5015                                                 pad_needed = 4 - (err_at % 4);
5016                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5017                                                 err_at += pad_needed;
5018                                         }
5019                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5020                                         s.param_length = htons(sizeof(s) + plen);
5021                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5022                                         err_at += sizeof(s);
5023                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5024                                         if (phdr == NULL) {
5025                                                 sctp_m_freem(op_err);
5026                                                 /*
5027                                                  * we are out of memory but
5028                                                  * we still need to have a
5029                                                  * look at what to do (the
5030                                                  * system is in trouble
5031                                                  * though).
5032                                                  */
5033                                                 return (NULL);
5034                                         }
5035                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5036                                 }
5037                                 return (op_err);
5038                                 break;
5039                         }
5040                 default:
5041                         /*
5042                          * we do not recognize the parameter figure out what
5043                          * we do.
5044                          */
5045                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5046                         if ((ptype & 0x4000) == 0x4000) {
5047                                 /* Report bit is set?? */
5048                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5049                                 if (op_err == NULL) {
5050                                         int l_len;
5051
5052                                         /* Ok need to try to get an mbuf */
5053 #ifdef INET6
5054                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5055 #else
5056                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5057 #endif
5058                                         l_len += plen;
5059                                         l_len += sizeof(struct sctp_paramhdr);
5060                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5061                                         if (op_err) {
5062                                                 SCTP_BUF_LEN(op_err) = 0;
5063 #ifdef INET6
5064                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5065 #else
5066                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5067 #endif
5068                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5069                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5070                                         }
5071                                 }
5072                                 if (op_err) {
5073                                         /* If we have space */
5074                                         struct sctp_paramhdr s;
5075
5076                                         if (err_at % 4) {
5077                                                 uint32_t cpthis = 0;
5078
5079                                                 pad_needed = 4 - (err_at % 4);
5080                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5081                                                 err_at += pad_needed;
5082                                         }
5083                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5084                                         s.param_length = htons(sizeof(s) + plen);
5085                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5086                                         err_at += sizeof(s);
5087                                         if (plen > sizeof(tempbuf)) {
5088                                                 plen = sizeof(tempbuf);
5089                                         }
5090                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5091                                         if (phdr == NULL) {
5092                                                 sctp_m_freem(op_err);
5093                                                 /*
5094                                                  * we are out of memory but
5095                                                  * we still need to have a
5096                                                  * look at what to do (the
5097                                                  * system is in trouble
5098                                                  * though).
5099                                                  */
5100                                                 op_err = NULL;
5101                                                 goto more_processing;
5102                                         }
5103                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5104                                         err_at += plen;
5105                                 }
5106                         }
5107         more_processing:
5108                         if ((ptype & 0x8000) == 0x0000) {
5109                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5110                                 return (op_err);
5111                         } else {
5112                                 /* skip this chunk and continue processing */
5113                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5114                                 at += SCTP_SIZE32(plen);
5115                         }
5116                         break;
5117
5118                 }
5119                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5120         }
5121         return (op_err);
5122 invalid_size:
5123         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5124         *abort_processing = 1;
5125         if ((op_err == NULL) && phdr) {
5126                 int l_len;
5127
5128 #ifdef INET6
5129                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5130 #else
5131                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5132 #endif
5133                 l_len += (2 * sizeof(struct sctp_paramhdr));
5134                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5135                 if (op_err) {
5136                         SCTP_BUF_LEN(op_err) = 0;
5137 #ifdef INET6
5138                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5139 #else
5140                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5141 #endif
5142                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5143                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5144                 }
5145         }
5146         if ((op_err) && phdr) {
5147                 struct sctp_paramhdr s;
5148
5149                 if (err_at % 4) {
5150                         uint32_t cpthis = 0;
5151
5152                         pad_needed = 4 - (err_at % 4);
5153                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5154                         err_at += pad_needed;
5155                 }
5156                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5157                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5158                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5159                 err_at += sizeof(s);
5160                 /* Only copy back the p-hdr that caused the issue */
5161                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5162         }
5163         return (op_err);
5164 }
5165
5166 static int
5167 sctp_are_there_new_addresses(struct sctp_association *asoc,
5168     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5169 {
5170         /*
5171          * Given a INIT packet, look through the packet to verify that there
5172          * are NO new addresses. As we go through the parameters add reports
5173          * of any un-understood parameters that require an error.  Also we
5174          * must return (1) to drop the packet if we see a un-understood
5175          * parameter that tells us to drop the chunk.
5176          */
5177         struct sockaddr *sa_touse;
5178         struct sockaddr *sa;
5179         struct sctp_paramhdr *phdr, params;
5180         uint16_t ptype, plen;
5181         uint8_t fnd;
5182         struct sctp_nets *net;
5183
5184 #ifdef INET
5185         struct sockaddr_in sin4, *sa4;
5186
5187 #endif
5188 #ifdef INET6
5189         struct sockaddr_in6 sin6, *sa6;
5190
5191 #endif
5192
5193 #ifdef INET
5194         memset(&sin4, 0, sizeof(sin4));
5195         sin4.sin_family = AF_INET;
5196         sin4.sin_len = sizeof(sin4);
5197 #endif
5198 #ifdef INET6
5199         memset(&sin6, 0, sizeof(sin6));
5200         sin6.sin6_family = AF_INET6;
5201         sin6.sin6_len = sizeof(sin6);
5202 #endif
5203         /* First what about the src address of the pkt ? */
5204         fnd = 0;
5205         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5206                 sa = (struct sockaddr *)&net->ro._l_addr;
5207                 if (sa->sa_family == src->sa_family) {
5208 #ifdef INET
5209                         if (sa->sa_family == AF_INET) {
5210                                 struct sockaddr_in *src4;
5211
5212                                 sa4 = (struct sockaddr_in *)sa;
5213                                 src4 = (struct sockaddr_in *)src;
5214                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5215                                         fnd = 1;
5216                                         break;
5217                                 }
5218                         }
5219 #endif
5220 #ifdef INET6
5221                         if (sa->sa_family == AF_INET6) {
5222                                 struct sockaddr_in6 *src6;
5223
5224                                 sa6 = (struct sockaddr_in6 *)sa;
5225                                 src6 = (struct sockaddr_in6 *)src;
5226                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5227                                         fnd = 1;
5228                                         break;
5229                                 }
5230                         }
5231 #endif
5232                 }
5233         }
5234         if (fnd == 0) {
5235                 /* New address added! no need to look futher. */
5236                 return (1);
5237         }
5238         /* Ok so far lets munge through the rest of the packet */
5239         offset += sizeof(struct sctp_init_chunk);
5240         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5241         while (phdr) {
5242                 sa_touse = NULL;
5243                 ptype = ntohs(phdr->param_type);
5244                 plen = ntohs(phdr->param_length);
5245                 switch (ptype) {
5246 #ifdef INET
5247                 case SCTP_IPV4_ADDRESS:
5248                         {
5249                                 struct sctp_ipv4addr_param *p4, p4_buf;
5250
5251                                 phdr = sctp_get_next_param(in_initpkt, offset,
5252                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5253                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5254                                     phdr == NULL) {
5255                                         return (1);
5256                                 }
5257                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5258                                 sin4.sin_addr.s_addr = p4->addr;
5259                                 sa_touse = (struct sockaddr *)&sin4;
5260                                 break;
5261                         }
5262 #endif
5263 #ifdef INET6
5264                 case SCTP_IPV6_ADDRESS:
5265                         {
5266                                 struct sctp_ipv6addr_param *p6, p6_buf;
5267
5268                                 phdr = sctp_get_next_param(in_initpkt, offset,
5269                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5270                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5271                                     phdr == NULL) {
5272                                         return (1);
5273                                 }
5274                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5275                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5276                                     sizeof(p6->addr));
5277                                 sa_touse = (struct sockaddr *)&sin6;
5278                                 break;
5279                         }
5280 #endif
5281                 default:
5282                         sa_touse = NULL;
5283                         break;
5284                 }
5285                 if (sa_touse) {
5286                         /* ok, sa_touse points to one to check */
5287                         fnd = 0;
5288                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5289                                 sa = (struct sockaddr *)&net->ro._l_addr;
5290                                 if (sa->sa_family != sa_touse->sa_family) {
5291                                         continue;
5292                                 }
5293 #ifdef INET
5294                                 if (sa->sa_family == AF_INET) {
5295                                         sa4 = (struct sockaddr_in *)sa;
5296                                         if (sa4->sin_addr.s_addr ==
5297                                             sin4.sin_addr.s_addr) {
5298                                                 fnd = 1;
5299                                                 break;
5300                                         }
5301                                 }
5302 #endif
5303 #ifdef INET6
5304                                 if (sa->sa_family == AF_INET6) {
5305                                         sa6 = (struct sockaddr_in6 *)sa;
5306                                         if (SCTP6_ARE_ADDR_EQUAL(
5307                                             sa6, &sin6)) {
5308                                                 fnd = 1;
5309                                                 break;
5310                                         }
5311                                 }
5312 #endif
5313                         }
5314                         if (!fnd) {
5315                                 /* New addr added! no need to look further */
5316                                 return (1);
5317                         }
5318                 }
5319                 offset += SCTP_SIZE32(plen);
5320                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5321         }
5322         return (0);
5323 }
5324
5325 /*
5326  * Given a MBUF chain that was sent into us containing an INIT. Build a
5327  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5328  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5329  * message (i.e. the struct sctp_init_msg).
5330  */
5331 void
5332 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5333     struct mbuf *init_pkt, int iphlen, int offset,
5334     struct sockaddr *src, struct sockaddr *dst,
5335     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5336     uint8_t use_mflowid, uint32_t mflowid,
5337     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5338 {
5339         struct sctp_association *asoc;
5340         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5341         struct sctp_init_ack_chunk *initack;
5342         struct sctp_adaptation_layer_indication *ali;
5343         struct sctp_ecn_supported_param *ecn;
5344         struct sctp_prsctp_supported_param *prsctp;
5345         struct sctp_supported_chunk_types_param *pr_supported;
5346         union sctp_sockstore *over_addr;
5347
5348 #ifdef INET
5349         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5350         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5351         struct sockaddr_in *sin;
5352
5353 #endif
5354 #ifdef INET6
5355         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5356         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5357         struct sockaddr_in6 *sin6;
5358
5359 #endif
5360         struct sockaddr *to;
5361         struct sctp_state_cookie stc;
5362         struct sctp_nets *net = NULL;
5363         uint8_t *signature = NULL;
5364         int cnt_inits_to = 0;
5365         uint16_t his_limit, i_want;
5366         int abort_flag, padval;
5367         int num_ext;
5368         int p_len;
5369         int nat_friendly = 0;
5370         struct socket *so;
5371
5372         if (stcb) {
5373                 asoc = &stcb->asoc;
5374         } else {
5375                 asoc = NULL;
5376         }
5377         mp_last = NULL;
5378         if ((asoc != NULL) &&
5379             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5380             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5381                 /* new addresses, out of here in non-cookie-wait states */
5382                 /*
5383                  * Send a ABORT, we don't add the new address error clause
5384                  * though we even set the T bit and copy in the 0 tag.. this
5385                  * looks no different than if no listener was present.
5386                  */
5387                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, NULL,
5388                     use_mflowid, mflowid,
5389                     vrf_id, port);
5390                 return;
5391         }
5392         abort_flag = 0;
5393         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5394             (offset + sizeof(struct sctp_init_chunk)),
5395             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5396         if (abort_flag) {
5397 do_a_abort:
5398                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5399                     init_chk->init.initiate_tag, op_err,
5400                     use_mflowid, mflowid,
5401                     vrf_id, port);
5402                 return;
5403         }
5404         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5405         if (m == NULL) {
5406                 /* No memory, INIT timer will re-attempt. */
5407                 if (op_err)
5408                         sctp_m_freem(op_err);
5409                 return;
5410         }
5411         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5412
5413         /* the time I built cookie */
5414         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5415
5416         /* populate any tie tags */
5417         if (asoc != NULL) {
5418                 /* unlock before tag selections */
5419                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5420                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5421                 stc.cookie_life = asoc->cookie_life;
5422                 net = asoc->primary_destination;
5423         } else {
5424                 stc.tie_tag_my_vtag = 0;
5425                 stc.tie_tag_peer_vtag = 0;
5426                 /* life I will award this cookie */
5427                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5428         }
5429
5430         /* copy in the ports for later check */
5431         stc.myport = sh->dest_port;
5432         stc.peerport = sh->src_port;
5433
5434         /*
5435          * If we wanted to honor cookie life extentions, we would add to
5436          * stc.cookie_life. For now we should NOT honor any extension
5437          */
5438         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5439         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5440                 stc.ipv6_addr_legal = 1;
5441                 if (SCTP_IPV6_V6ONLY(inp)) {
5442                         stc.ipv4_addr_legal = 0;
5443                 } else {
5444                         stc.ipv4_addr_legal = 1;
5445                 }
5446         } else {
5447                 stc.ipv6_addr_legal = 0;
5448                 stc.ipv4_addr_legal = 1;
5449         }
5450 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5451         stc.ipv4_scope = 1;
5452 #else
5453         stc.ipv4_scope = 0;
5454 #endif
5455         if (net == NULL) {
5456                 to = src;
5457                 switch (dst->sa_family) {
5458 #ifdef INET
5459                 case AF_INET:
5460                         {
5461                                 /* lookup address */
5462                                 stc.address[0] = src4->sin_addr.s_addr;
5463                                 stc.address[1] = 0;
5464                                 stc.address[2] = 0;
5465                                 stc.address[3] = 0;
5466                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5467                                 /* local from address */
5468                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5469                                 stc.laddress[1] = 0;
5470                                 stc.laddress[2] = 0;
5471                                 stc.laddress[3] = 0;
5472                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5473                                 /* scope_id is only for v6 */
5474                                 stc.scope_id = 0;
5475 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5476                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5477                                         stc.ipv4_scope = 1;
5478                                 }
5479 #else
5480                                 stc.ipv4_scope = 1;
5481 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5482                                 /* Must use the address in this case */
5483                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5484                                         stc.loopback_scope = 1;
5485                                         stc.ipv4_scope = 1;
5486                                         stc.site_scope = 1;
5487                                         stc.local_scope = 0;
5488                                 }
5489                                 break;
5490                         }
5491 #endif
5492 #ifdef INET6
5493                 case AF_INET6:
5494                         {
5495                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5496                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5497                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5498                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5499                                         stc.loopback_scope = 1;
5500                                         stc.local_scope = 0;
5501                                         stc.site_scope = 1;
5502                                         stc.ipv4_scope = 1;
5503                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5504                                         /*
5505                                          * If the new destination is a
5506                                          * LINK_LOCAL we must have common
5507                                          * both site and local scope. Don't
5508                                          * set local scope though since we
5509                                          * must depend on the source to be
5510                                          * added implicitly. We cannot
5511                                          * assure just because we share one
5512                                          * link that all links are common.
5513                                          */
5514                                         stc.local_scope = 0;
5515                                         stc.site_scope = 1;
5516                                         stc.ipv4_scope = 1;
5517                                         /*
5518                                          * we start counting for the private
5519                                          * address stuff at 1. since the
5520                                          * link local we source from won't
5521                                          * show up in our scoped count.
5522                                          */
5523                                         cnt_inits_to = 1;
5524                                         /*
5525                                          * pull out the scope_id from
5526                                          * incoming pkt
5527                                          */
5528                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5529                                         /*
5530                                          * If the new destination is
5531                                          * SITE_LOCAL then we must have site
5532                                          * scope in common.
5533                                          */
5534                                         stc.site_scope = 1;
5535                                 }
5536                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5537                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5538                                 break;
5539                         }
5540 #endif
5541                 default:
5542                         /* TSNH */
5543                         goto do_a_abort;
5544                         break;
5545                 }
5546         } else {
5547                 /* set the scope per the existing tcb */
5548
5549 #ifdef INET6
5550                 struct sctp_nets *lnet;
5551
5552 #endif
5553
5554                 stc.loopback_scope = asoc->scope.loopback_scope;
5555                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5556                 stc.site_scope = asoc->scope.site_scope;
5557                 stc.local_scope = asoc->scope.local_scope;
5558 #ifdef INET6
5559                 /* Why do we not consider IPv4 LL addresses? */
5560                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5561                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5562                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5563                                         /*
5564                                          * if we have a LL address, start
5565                                          * counting at 1.
5566                                          */
5567                                         cnt_inits_to = 1;
5568                                 }
5569                         }
5570                 }
5571 #endif
5572                 /* use the net pointer */
5573                 to = (struct sockaddr *)&net->ro._l_addr;
5574                 switch (to->sa_family) {
5575 #ifdef INET
5576                 case AF_INET:
5577                         sin = (struct sockaddr_in *)to;
5578                         stc.address[0] = sin->sin_addr.s_addr;
5579                         stc.address[1] = 0;
5580                         stc.address[2] = 0;
5581                         stc.address[3] = 0;
5582                         stc.addr_type = SCTP_IPV4_ADDRESS;
5583                         if (net->src_addr_selected == 0) {
5584                                 /*
5585                                  * strange case here, the INIT should have
5586                                  * did the selection.
5587                                  */
5588                                 net->ro._s_addr = sctp_source_address_selection(inp,
5589                                     stcb, (sctp_route_t *) & net->ro,
5590                                     net, 0, vrf_id);
5591                                 if (net->ro._s_addr == NULL)
5592                                         return;
5593
5594                                 net->src_addr_selected = 1;
5595
5596                         }
5597                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5598                         stc.laddress[1] = 0;
5599                         stc.laddress[2] = 0;
5600                         stc.laddress[3] = 0;
5601                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5602                         /* scope_id is only for v6 */
5603                         stc.scope_id = 0;
5604                         break;
5605 #endif
5606 #ifdef INET6
5607                 case AF_INET6:
5608                         sin6 = (struct sockaddr_in6 *)to;
5609                         memcpy(&stc.address, &sin6->sin6_addr,
5610                             sizeof(struct in6_addr));
5611                         stc.addr_type = SCTP_IPV6_ADDRESS;
5612                         stc.scope_id = sin6->sin6_scope_id;
5613                         if (net->src_addr_selected == 0) {
5614                                 /*
5615                                  * strange case here, the INIT should have
5616                                  * done the selection.
5617                                  */
5618                                 net->ro._s_addr = sctp_source_address_selection(inp,
5619                                     stcb, (sctp_route_t *) & net->ro,
5620                                     net, 0, vrf_id);
5621                                 if (net->ro._s_addr == NULL)
5622                                         return;
5623
5624                                 net->src_addr_selected = 1;
5625                         }
5626                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5627                             sizeof(struct in6_addr));
5628                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5629                         break;
5630 #endif
5631                 }
5632         }
5633         /* Now lets put the SCTP header in place */
5634         initack = mtod(m, struct sctp_init_ack_chunk *);
5635         /* Save it off for quick ref */
5636         stc.peers_vtag = init_chk->init.initiate_tag;
5637         /* who are we */
5638         memcpy(stc.identification, SCTP_VERSION_STRING,
5639             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5640         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5641         /* now the chunk header */
5642         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5643         initack->ch.chunk_flags = 0;
5644         /* fill in later from mbuf we build */
5645         initack->ch.chunk_length = 0;
5646         /* place in my tag */
5647         if ((asoc != NULL) &&
5648             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5649             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5650             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5651                 /* re-use the v-tags and init-seq here */
5652                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5653                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5654         } else {
5655                 uint32_t vtag, itsn;
5656
5657                 if (hold_inp_lock) {
5658                         SCTP_INP_INCR_REF(inp);
5659                         SCTP_INP_RUNLOCK(inp);
5660                 }
5661                 if (asoc) {
5662                         atomic_add_int(&asoc->refcnt, 1);
5663                         SCTP_TCB_UNLOCK(stcb);
5664         new_tag:
5665                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5666                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5667                                 /*
5668                                  * Got a duplicate vtag on some guy behind a
5669                                  * nat make sure we don't use it.
5670                                  */
5671                                 goto new_tag;
5672                         }
5673                         initack->init.initiate_tag = htonl(vtag);
5674                         /* get a TSN to use too */
5675                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5676                         initack->init.initial_tsn = htonl(itsn);
5677                         SCTP_TCB_LOCK(stcb);
5678                         atomic_add_int(&asoc->refcnt, -1);
5679                 } else {
5680                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5681                         initack->init.initiate_tag = htonl(vtag);
5682                         /* get a TSN to use too */
5683                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5684                 }
5685                 if (hold_inp_lock) {
5686                         SCTP_INP_RLOCK(inp);
5687                         SCTP_INP_DECR_REF(inp);
5688                 }
5689         }
5690         /* save away my tag to */
5691         stc.my_vtag = initack->init.initiate_tag;
5692
5693         /* set up some of the credits. */
5694         so = inp->sctp_socket;
5695         if (so == NULL) {
5696                 /* memory problem */
5697                 sctp_m_freem(m);
5698                 return;
5699         } else {
5700                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5701         }
5702         /* set what I want */
5703         his_limit = ntohs(init_chk->init.num_inbound_streams);
5704         /* choose what I want */
5705         if (asoc != NULL) {
5706                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5707                         i_want = asoc->streamoutcnt;
5708                 } else {
5709                         i_want = inp->sctp_ep.pre_open_stream_count;
5710                 }
5711         } else {
5712                 i_want = inp->sctp_ep.pre_open_stream_count;
5713         }
5714         if (his_limit < i_want) {
5715                 /* I Want more :< */
5716                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5717         } else {
5718                 /* I can have what I want :> */
5719                 initack->init.num_outbound_streams = htons(i_want);
5720         }
5721         /* tell him his limit. */
5722         initack->init.num_inbound_streams =
5723             htons(inp->sctp_ep.max_open_streams_intome);
5724
5725         /* adaptation layer indication parameter */
5726         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5727                 ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5728                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5729                 ali->ph.param_length = htons(sizeof(*ali));
5730                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5731                 SCTP_BUF_LEN(m) += sizeof(*ali);
5732                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5733         } else {
5734                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)initack + sizeof(*initack));
5735         }
5736
5737         /* ECN parameter */
5738         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5739             (inp->sctp_ecn_enable == 1)) {
5740                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5741                 ecn->ph.param_length = htons(sizeof(*ecn));
5742                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5743
5744                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5745                     sizeof(*ecn));
5746         } else {
5747                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5748         }
5749         /* And now tell the peer we do  pr-sctp */
5750         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5751         prsctp->ph.param_length = htons(sizeof(*prsctp));
5752         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5753         if (nat_friendly) {
5754                 /* Add NAT friendly parameter */
5755                 struct sctp_paramhdr *ph;
5756
5757                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5758                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5759                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5760                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5761         }
5762         /* And now tell the peer we do all the extensions */
5763         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5764         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5765         num_ext = 0;
5766         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5767         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5768         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5769         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5770         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5771         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5772                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5773         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5774                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5775         p_len = sizeof(*pr_supported) + num_ext;
5776         pr_supported->ph.param_length = htons(p_len);
5777         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5778         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5779
5780         /* add authentication parameters */
5781         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5782                 struct sctp_auth_random *randp;
5783                 struct sctp_auth_hmac_algo *hmacs;
5784                 struct sctp_auth_chunk_list *chunks;
5785                 uint16_t random_len;
5786
5787                 /* generate and add RANDOM parameter */
5788                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5789                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5790                 randp->ph.param_type = htons(SCTP_RANDOM);
5791                 p_len = sizeof(*randp) + random_len;
5792                 randp->ph.param_length = htons(p_len);
5793                 SCTP_READ_RANDOM(randp->random_data, random_len);
5794                 /* zero out any padding required */
5795                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5796                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5797
5798                 /* add HMAC_ALGO parameter */
5799                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5800                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5801                     (uint8_t *) hmacs->hmac_ids);
5802                 if (p_len > 0) {
5803                         p_len += sizeof(*hmacs);
5804                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5805                         hmacs->ph.param_length = htons(p_len);
5806                         /* zero out any padding required */
5807                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5808                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5809                 }
5810                 /* add CHUNKS parameter */
5811                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5812                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5813                     chunks->chunk_types);
5814                 if (p_len > 0) {
5815                         p_len += sizeof(*chunks);
5816                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5817                         chunks->ph.param_length = htons(p_len);
5818                         /* zero out any padding required */
5819                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5820                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5821                 }
5822         }
5823         m_at = m;
5824         /* now the addresses */
5825         {
5826                 struct sctp_scoping scp;
5827
5828                 /*
5829                  * To optimize this we could put the scoping stuff into a
5830                  * structure and remove the individual uint8's from the stc
5831                  * structure. Then we could just sifa in the address within
5832                  * the stc.. but for now this is a quick hack to get the
5833                  * address stuff teased apart.
5834                  */
5835                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5836                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5837                 scp.loopback_scope = stc.loopback_scope;
5838                 scp.ipv4_local_scope = stc.ipv4_scope;
5839                 scp.local_scope = stc.local_scope;
5840                 scp.site_scope = stc.site_scope;
5841                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to, NULL, NULL);
5842         }
5843
5844         /* tack on the operational error if present */
5845         if (op_err) {
5846                 struct mbuf *ol;
5847                 int llen;
5848
5849                 llen = 0;
5850                 ol = op_err;
5851
5852                 while (ol) {
5853                         llen += SCTP_BUF_LEN(ol);
5854                         ol = SCTP_BUF_NEXT(ol);
5855                 }
5856                 if (llen % 4) {
5857                         /* must add a pad to the param */
5858                         uint32_t cpthis = 0;
5859                         int padlen;
5860
5861                         padlen = 4 - (llen % 4);
5862                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5863                 }
5864                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5865                         m_at = SCTP_BUF_NEXT(m_at);
5866                 }
5867                 SCTP_BUF_NEXT(m_at) = op_err;
5868                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5869                         m_at = SCTP_BUF_NEXT(m_at);
5870                 }
5871         }
5872         /* pre-calulate the size and update pkt header and chunk header */
5873         p_len = 0;
5874         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5875                 p_len += SCTP_BUF_LEN(m_tmp);
5876                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5877                         /* m_tmp should now point to last one */
5878                         break;
5879                 }
5880         }
5881
5882         /* Now we must build a cookie */
5883         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5884         if (m_cookie == NULL) {
5885                 /* memory problem */
5886                 sctp_m_freem(m);
5887                 return;
5888         }
5889         /* Now append the cookie to the end and update the space/size */
5890         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5891
5892         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5893                 p_len += SCTP_BUF_LEN(m_tmp);
5894                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5895                         /* m_tmp should now point to last one */
5896                         mp_last = m_tmp;
5897                         break;
5898                 }
5899         }
5900         /*
5901          * Place in the size, but we don't include the last pad (if any) in
5902          * the INIT-ACK.
5903          */
5904         initack->ch.chunk_length = htons(p_len);
5905
5906         /*
5907          * Time to sign the cookie, we don't sign over the cookie signature
5908          * though thus we set trailer.
5909          */
5910         (void)sctp_hmac_m(SCTP_HMAC,
5911             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5912             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5913             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5914         /*
5915          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5916          * here since the timer will drive a retranmission.
5917          */
5918         padval = p_len % 4;
5919         if ((padval) && (mp_last)) {
5920                 /* see my previous comments on mp_last */
5921                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
5922                         /* Houston we have a problem, no space */
5923                         sctp_m_freem(m);
5924                         return;
5925                 }
5926         }
5927         if (stc.loopback_scope) {
5928                 over_addr = (union sctp_sockstore *)dst;
5929         } else {
5930                 over_addr = NULL;
5931         }
5932
5933         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5934             0, 0,
5935             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5936             port, over_addr,
5937             use_mflowid, mflowid,
5938             SCTP_SO_NOT_LOCKED);
5939         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5940 }
5941
5942
5943 static void
5944 sctp_prune_prsctp(struct sctp_tcb *stcb,
5945     struct sctp_association *asoc,
5946     struct sctp_sndrcvinfo *srcv,
5947     int dataout)
5948 {
5949         int freed_spc = 0;
5950         struct sctp_tmit_chunk *chk, *nchk;
5951
5952         SCTP_TCB_LOCK_ASSERT(stcb);
5953         if ((asoc->peer_supports_prsctp) &&
5954             (asoc->sent_queue_cnt_removeable > 0)) {
5955                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5956                         /*
5957                          * Look for chunks marked with the PR_SCTP flag AND
5958                          * the buffer space flag. If the one being sent is
5959                          * equal or greater priority then purge the old one
5960                          * and free some space.
5961                          */
5962                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5963                                 /*
5964                                  * This one is PR-SCTP AND buffer space
5965                                  * limited type
5966                                  */
5967                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5968                                         /*
5969                                          * Lower numbers equates to higher
5970                                          * priority so if the one we are
5971                                          * looking at has a larger or equal
5972                                          * priority we want to drop the data
5973                                          * and NOT retransmit it.
5974                                          */
5975                                         if (chk->data) {
5976                                                 /*
5977                                                  * We release the book_size
5978                                                  * if the mbuf is here
5979                                                  */
5980                                                 int ret_spc;
5981                                                 uint8_t sent;
5982
5983                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5984                                                         sent = 1;
5985                                                 else
5986                                                         sent = 0;
5987                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5988                                                     sent,
5989                                                     SCTP_SO_LOCKED);
5990                                                 freed_spc += ret_spc;
5991                                                 if (freed_spc >= dataout) {
5992                                                         return;
5993                                                 }
5994                                         }       /* if chunk was present */
5995                                 }       /* if of sufficent priority */
5996                         }       /* if chunk has enabled */
5997                 }               /* tailqforeach */
5998
5999                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6000                         /* Here we must move to the sent queue and mark */
6001                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6002                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6003                                         if (chk->data) {
6004                                                 /*
6005                                                  * We release the book_size
6006                                                  * if the mbuf is here
6007                                                  */
6008                                                 int ret_spc;
6009
6010                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6011                                                     0, SCTP_SO_LOCKED);
6012
6013                                                 freed_spc += ret_spc;
6014                                                 if (freed_spc >= dataout) {
6015                                                         return;
6016                                                 }
6017                                         }       /* end if chk->data */
6018                                 }       /* end if right class */
6019                         }       /* end if chk pr-sctp */
6020                 }               /* tailqforeachsafe (chk) */
6021         }                       /* if enabled in asoc */
6022 }
6023
6024 int
6025 sctp_get_frag_point(struct sctp_tcb *stcb,
6026     struct sctp_association *asoc)
6027 {
6028         int siz, ovh;
6029
6030         /*
6031          * For endpoints that have both v6 and v4 addresses we must reserve
6032          * room for the ipv6 header, for those that are only dealing with V4
6033          * we use a larger frag point.
6034          */
6035         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6036                 ovh = SCTP_MED_OVERHEAD;
6037         } else {
6038                 ovh = SCTP_MED_V4_OVERHEAD;
6039         }
6040
6041         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6042                 siz = asoc->smallest_mtu - ovh;
6043         else
6044                 siz = (stcb->asoc.sctp_frag_point - ovh);
6045         /*
6046          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6047          */
6048         /* A data chunk MUST fit in a cluster */
6049         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6050         /* } */
6051
6052         /* adjust for an AUTH chunk if DATA requires auth */
6053         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6054                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6055
6056         if (siz % 4) {
6057                 /* make it an even word boundary please */
6058                 siz -= (siz % 4);
6059         }
6060         return (siz);
6061 }
6062
6063 static void
6064 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6065 {
6066         sp->pr_sctp_on = 0;
6067         /*
6068          * We assume that the user wants PR_SCTP_TTL if the user provides a
6069          * positive lifetime but does not specify any PR_SCTP policy. This
6070          * is a BAD assumption and causes problems at least with the
6071          * U-Vancovers MPI folks. I will change this to be no policy means
6072          * NO PR-SCTP.
6073          */
6074         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6075                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6076                 sp->pr_sctp_on = 1;
6077         } else {
6078                 return;
6079         }
6080         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6081         case CHUNK_FLAGS_PR_SCTP_BUF:
6082                 /*
6083                  * Time to live is a priority stored in tv_sec when doing
6084                  * the buffer drop thing.
6085                  */
6086                 sp->ts.tv_sec = sp->timetolive;
6087                 sp->ts.tv_usec = 0;
6088                 break;
6089         case CHUNK_FLAGS_PR_SCTP_TTL:
6090                 {
6091                         struct timeval tv;
6092
6093                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6094                         tv.tv_sec = sp->timetolive / 1000;
6095                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6096                         /*
6097                          * TODO sctp_constants.h needs alternative time
6098                          * macros when _KERNEL is undefined.
6099                          */
6100                         timevaladd(&sp->ts, &tv);
6101                 }
6102                 break;
6103         case CHUNK_FLAGS_PR_SCTP_RTX:
6104                 /*
6105                  * Time to live is a the number or retransmissions stored in
6106                  * tv_sec.
6107                  */
6108                 sp->ts.tv_sec = sp->timetolive;
6109                 sp->ts.tv_usec = 0;
6110                 break;
6111         default:
6112                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6113                     "Unknown PR_SCTP policy %u.\n",
6114                     PR_SCTP_POLICY(sp->sinfo_flags));
6115                 break;
6116         }
6117 }
6118
6119 static int
6120 sctp_msg_append(struct sctp_tcb *stcb,
6121     struct sctp_nets *net,
6122     struct mbuf *m,
6123     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6124 {
6125         int error = 0;
6126         struct mbuf *at;
6127         struct sctp_stream_queue_pending *sp = NULL;
6128         struct sctp_stream_out *strm;
6129
6130         /*
6131          * Given an mbuf chain, put it into the association send queue and
6132          * place it on the wheel
6133          */
6134         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6135                 /* Invalid stream number */
6136                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6137                 error = EINVAL;
6138                 goto out_now;
6139         }
6140         if ((stcb->asoc.stream_locked) &&
6141             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6142                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6143                 error = EINVAL;
6144                 goto out_now;
6145         }
6146         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6147         /* Now can we send this? */
6148         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6149             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6150             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6151             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6152                 /* got data while shutting down */
6153                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6154                 error = ECONNRESET;
6155                 goto out_now;
6156         }
6157         sctp_alloc_a_strmoq(stcb, sp);
6158         if (sp == NULL) {
6159                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6160                 error = ENOMEM;
6161                 goto out_now;
6162         }
6163         sp->sinfo_flags = srcv->sinfo_flags;
6164         sp->timetolive = srcv->sinfo_timetolive;
6165         sp->ppid = srcv->sinfo_ppid;
6166         sp->context = srcv->sinfo_context;
6167         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6168                 sp->net = net;
6169                 atomic_add_int(&sp->net->ref_count, 1);
6170         } else {
6171                 sp->net = NULL;
6172         }
6173         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6174         sp->stream = srcv->sinfo_stream;
6175         sp->msg_is_complete = 1;
6176         sp->sender_all_done = 1;
6177         sp->some_taken = 0;
6178         sp->data = m;
6179         sp->tail_mbuf = NULL;
6180         sctp_set_prsctp_policy(sp);
6181         /*
6182          * We could in theory (for sendall) sifa the length in, but we would
6183          * still have to hunt through the chain since we need to setup the
6184          * tail_mbuf
6185          */
6186         sp->length = 0;
6187         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6188                 if (SCTP_BUF_NEXT(at) == NULL)
6189                         sp->tail_mbuf = at;
6190                 sp->length += SCTP_BUF_LEN(at);
6191         }
6192         if (srcv->sinfo_keynumber_valid) {
6193                 sp->auth_keyid = srcv->sinfo_keynumber;
6194         } else {
6195                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6196         }
6197         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6198                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6199                 sp->holds_key_ref = 1;
6200         }
6201         if (hold_stcb_lock == 0) {
6202                 SCTP_TCB_SEND_LOCK(stcb);
6203         }
6204         sctp_snd_sb_alloc(stcb, sp->length);
6205         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6206         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6207         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6208         m = NULL;
6209         if (hold_stcb_lock == 0) {
6210                 SCTP_TCB_SEND_UNLOCK(stcb);
6211         }
6212 out_now:
6213         if (m) {
6214                 sctp_m_freem(m);
6215         }
6216         return (error);
6217 }
6218
6219
6220 static struct mbuf *
6221 sctp_copy_mbufchain(struct mbuf *clonechain,
6222     struct mbuf *outchain,
6223     struct mbuf **endofchain,
6224     int can_take_mbuf,
6225     int sizeofcpy,
6226     uint8_t copy_by_ref)
6227 {
6228         struct mbuf *m;
6229         struct mbuf *appendchain;
6230         caddr_t cp;
6231         int len;
6232
6233         if (endofchain == NULL) {
6234                 /* error */
6235 error_out:
6236                 if (outchain)
6237                         sctp_m_freem(outchain);
6238                 return (NULL);
6239         }
6240         if (can_take_mbuf) {
6241                 appendchain = clonechain;
6242         } else {
6243                 if (!copy_by_ref &&
6244                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6245                     ) {
6246                         /* Its not in a cluster */
6247                         if (*endofchain == NULL) {
6248                                 /* lets get a mbuf cluster */
6249                                 if (outchain == NULL) {
6250                                         /* This is the general case */
6251                         new_mbuf:
6252                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6253                                         if (outchain == NULL) {
6254                                                 goto error_out;
6255                                         }
6256                                         SCTP_BUF_LEN(outchain) = 0;
6257                                         *endofchain = outchain;
6258                                         /* get the prepend space */
6259                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6260                                 } else {
6261                                         /*
6262                                          * We really should not get a NULL
6263                                          * in endofchain
6264                                          */
6265                                         /* find end */
6266                                         m = outchain;
6267                                         while (m) {
6268                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6269                                                         *endofchain = m;
6270                                                         break;
6271                                                 }
6272                                                 m = SCTP_BUF_NEXT(m);
6273                                         }
6274                                         /* sanity */
6275                                         if (*endofchain == NULL) {
6276                                                 /*
6277                                                  * huh, TSNH XXX maybe we
6278                                                  * should panic
6279                                                  */
6280                                                 sctp_m_freem(outchain);
6281                                                 goto new_mbuf;
6282                                         }
6283                                 }
6284                                 /* get the new end of length */
6285                                 len = M_TRAILINGSPACE(*endofchain);
6286                         } else {
6287                                 /* how much is left at the end? */
6288                                 len = M_TRAILINGSPACE(*endofchain);
6289                         }
6290                         /* Find the end of the data, for appending */
6291                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6292
6293                         /* Now lets copy it out */
6294                         if (len >= sizeofcpy) {
6295                                 /* It all fits, copy it in */
6296                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6297                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6298                         } else {
6299                                 /* fill up the end of the chain */
6300                                 if (len > 0) {
6301                                         m_copydata(clonechain, 0, len, cp);
6302                                         SCTP_BUF_LEN((*endofchain)) += len;
6303                                         /* now we need another one */
6304                                         sizeofcpy -= len;
6305                                 }
6306                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6307                                 if (m == NULL) {
6308                                         /* We failed */
6309                                         goto error_out;
6310                                 }
6311                                 SCTP_BUF_NEXT((*endofchain)) = m;
6312                                 *endofchain = m;
6313                                 cp = mtod((*endofchain), caddr_t);
6314                                 m_copydata(clonechain, len, sizeofcpy, cp);
6315                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6316                         }
6317                         return (outchain);
6318                 } else {
6319                         /* copy the old fashion way */
6320                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6321 #ifdef SCTP_MBUF_LOGGING
6322                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6323                                 struct mbuf *mat;
6324
6325                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6326                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6327                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6328                                         }
6329                                 }
6330                         }
6331 #endif
6332                 }
6333         }
6334         if (appendchain == NULL) {
6335                 /* error */
6336                 if (outchain)
6337                         sctp_m_freem(outchain);
6338                 return (NULL);
6339         }
6340         if (outchain) {
6341                 /* tack on to the end */
6342                 if (*endofchain != NULL) {
6343                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6344                 } else {
6345                         m = outchain;
6346                         while (m) {
6347                                 if (SCTP_BUF_NEXT(m) == NULL) {
6348                                         SCTP_BUF_NEXT(m) = appendchain;
6349                                         break;
6350                                 }
6351                                 m = SCTP_BUF_NEXT(m);
6352                         }
6353                 }
6354                 /*
6355                  * save off the end and update the end-chain postion
6356                  */
6357                 m = appendchain;
6358                 while (m) {
6359                         if (SCTP_BUF_NEXT(m) == NULL) {
6360                                 *endofchain = m;
6361                                 break;
6362                         }
6363                         m = SCTP_BUF_NEXT(m);
6364                 }
6365                 return (outchain);
6366         } else {
6367                 /* save off the end and update the end-chain postion */
6368                 m = appendchain;
6369                 while (m) {
6370                         if (SCTP_BUF_NEXT(m) == NULL) {
6371                                 *endofchain = m;
6372                                 break;
6373                         }
6374                         m = SCTP_BUF_NEXT(m);
6375                 }
6376                 return (appendchain);
6377         }
6378 }
6379
6380 static int
6381 sctp_med_chunk_output(struct sctp_inpcb *inp,
6382     struct sctp_tcb *stcb,
6383     struct sctp_association *asoc,
6384     int *num_out,
6385     int *reason_code,
6386     int control_only, int from_where,
6387     struct timeval *now, int *now_filled, int frag_point, int so_locked
6388 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6389     SCTP_UNUSED
6390 #endif
6391 );
6392
6393 static void
6394 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6395     uint32_t val SCTP_UNUSED)
6396 {
6397         struct sctp_copy_all *ca;
6398         struct mbuf *m;
6399         int ret = 0;
6400         int added_control = 0;
6401         int un_sent, do_chunk_output = 1;
6402         struct sctp_association *asoc;
6403         struct sctp_nets *net;
6404
6405         ca = (struct sctp_copy_all *)ptr;
6406         if (ca->m == NULL) {
6407                 return;
6408         }
6409         if (ca->inp != inp) {
6410                 /* TSNH */
6411                 return;
6412         }
6413         if ((ca->m) && ca->sndlen) {
6414                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6415                 if (m == NULL) {
6416                         /* can't copy so we are done */
6417                         ca->cnt_failed++;
6418                         return;
6419                 }
6420 #ifdef SCTP_MBUF_LOGGING
6421                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6422                         struct mbuf *mat;
6423
6424                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6425                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6426                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6427                                 }
6428                         }
6429                 }
6430 #endif
6431         } else {
6432                 m = NULL;
6433         }
6434         SCTP_TCB_LOCK_ASSERT(stcb);
6435         if (stcb->asoc.alternate) {
6436                 net = stcb->asoc.alternate;
6437         } else {
6438                 net = stcb->asoc.primary_destination;
6439         }
6440         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6441                 /* Abort this assoc with m as the user defined reason */
6442                 if (m) {
6443                         struct sctp_paramhdr *ph;
6444
6445                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6446                         if (m) {
6447                                 ph = mtod(m, struct sctp_paramhdr *);
6448                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6449                                 ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6450                         }
6451                         /*
6452                          * We add one here to keep the assoc from
6453                          * dis-appearing on us.
6454                          */
6455                         atomic_add_int(&stcb->asoc.refcnt, 1);
6456                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6457                         /*
6458                          * sctp_abort_an_association calls sctp_free_asoc()
6459                          * free association will NOT free it since we
6460                          * incremented the refcnt .. we do this to prevent
6461                          * it being freed and things getting tricky since we
6462                          * could end up (from free_asoc) calling inpcb_free
6463                          * which would get a recursive lock call to the
6464                          * iterator lock.. But as a consequence of that the
6465                          * stcb will return to us un-locked.. since
6466                          * free_asoc returns with either no TCB or the TCB
6467                          * unlocked, we must relock.. to unlock in the
6468                          * iterator timer :-0
6469                          */
6470                         SCTP_TCB_LOCK(stcb);
6471                         atomic_add_int(&stcb->asoc.refcnt, -1);
6472                         goto no_chunk_output;
6473                 }
6474         } else {
6475                 if (m) {
6476                         ret = sctp_msg_append(stcb, net, m,
6477                             &ca->sndrcv, 1);
6478                 }
6479                 asoc = &stcb->asoc;
6480                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6481                         /* shutdown this assoc */
6482                         int cnt;
6483
6484                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6485
6486                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6487                             TAILQ_EMPTY(&asoc->sent_queue) &&
6488                             (cnt == 0)) {
6489                                 if (asoc->locked_on_sending) {
6490                                         goto abort_anyway;
6491                                 }
6492                                 /*
6493                                  * there is nothing queued to send, so I'm
6494                                  * done...
6495                                  */
6496                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6497                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6498                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6499                                         /*
6500                                          * only send SHUTDOWN the first time
6501                                          * through
6502                                          */
6503                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6504                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6505                                         }
6506                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6507                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6508                                         sctp_stop_timers_for_shutdown(stcb);
6509                                         sctp_send_shutdown(stcb, net);
6510                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6511                                             net);
6512                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6513                                             asoc->primary_destination);
6514                                         added_control = 1;
6515                                         do_chunk_output = 0;
6516                                 }
6517                         } else {
6518                                 /*
6519                                  * we still got (or just got) data to send,
6520                                  * so set SHUTDOWN_PENDING
6521                                  */
6522                                 /*
6523                                  * XXX sockets draft says that SCTP_EOF
6524                                  * should be sent with no data.  currently,
6525                                  * we will allow user data to be sent first
6526                                  * and move to SHUTDOWN-PENDING
6527                                  */
6528                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6529                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6530                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6531                                         if (asoc->locked_on_sending) {
6532                                                 /*
6533                                                  * Locked to send out the
6534                                                  * data
6535                                                  */
6536                                                 struct sctp_stream_queue_pending *sp;
6537
6538                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6539                                                 if (sp) {
6540                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6541                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6542                                                 }
6543                                         }
6544                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6545                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6546                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6547                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6548                                 abort_anyway:
6549                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6550                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6551                                                     NULL, SCTP_SO_NOT_LOCKED);
6552                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6553                                                 goto no_chunk_output;
6554                                         }
6555                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6556                                             asoc->primary_destination);
6557                                 }
6558                         }
6559
6560                 }
6561         }
6562         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6563             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6564
6565         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6566             (stcb->asoc.total_flight > 0) &&
6567             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6568             ) {
6569                 do_chunk_output = 0;
6570         }
6571         if (do_chunk_output)
6572                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6573         else if (added_control) {
6574                 int num_out = 0, reason = 0, now_filled = 0;
6575                 struct timeval now;
6576                 int frag_point;
6577
6578                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6579                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6580                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6581         }
6582 no_chunk_output:
6583         if (ret) {
6584                 ca->cnt_failed++;
6585         } else {
6586                 ca->cnt_sent++;
6587         }
6588 }
6589
6590 static void
6591 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6592 {
6593         struct sctp_copy_all *ca;
6594
6595         ca = (struct sctp_copy_all *)ptr;
6596         /*
6597          * Do a notify here? Kacheong suggests that the notify be done at
6598          * the send time.. so you would push up a notification if any send
6599          * failed. Don't know if this is feasable since the only failures we
6600          * have is "memory" related and if you cannot get an mbuf to send
6601          * the data you surely can't get an mbuf to send up to notify the
6602          * user you can't send the data :->
6603          */
6604
6605         /* now free everything */
6606         sctp_m_freem(ca->m);
6607         SCTP_FREE(ca, SCTP_M_COPYAL);
6608 }
6609
6610
6611 #define MC_ALIGN(m, len) do {                                           \
6612         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6613 } while (0)
6614
6615
6616
6617 static struct mbuf *
6618 sctp_copy_out_all(struct uio *uio, int len)
6619 {
6620         struct mbuf *ret, *at;
6621         int left, willcpy, cancpy, error;
6622
6623         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6624         if (ret == NULL) {
6625                 /* TSNH */
6626                 return (NULL);
6627         }
6628         left = len;
6629         SCTP_BUF_LEN(ret) = 0;
6630         /* save space for the data chunk header */
6631         cancpy = M_TRAILINGSPACE(ret);
6632         willcpy = min(cancpy, left);
6633         at = ret;
6634         while (left > 0) {
6635                 /* Align data to the end */
6636                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6637                 if (error) {
6638         err_out_now:
6639                         sctp_m_freem(at);
6640                         return (NULL);
6641                 }
6642                 SCTP_BUF_LEN(at) = willcpy;
6643                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6644                 left -= willcpy;
6645                 if (left > 0) {
6646                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6647                         if (SCTP_BUF_NEXT(at) == NULL) {
6648                                 goto err_out_now;
6649                         }
6650                         at = SCTP_BUF_NEXT(at);
6651                         SCTP_BUF_LEN(at) = 0;
6652                         cancpy = M_TRAILINGSPACE(at);
6653                         willcpy = min(cancpy, left);
6654                 }
6655         }
6656         return (ret);
6657 }
6658
6659 static int
6660 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6661     struct sctp_sndrcvinfo *srcv)
6662 {
6663         int ret;
6664         struct sctp_copy_all *ca;
6665
6666         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6667             SCTP_M_COPYAL);
6668         if (ca == NULL) {
6669                 sctp_m_freem(m);
6670                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6671                 return (ENOMEM);
6672         }
6673         memset(ca, 0, sizeof(struct sctp_copy_all));
6674
6675         ca->inp = inp;
6676         if (srcv) {
6677                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6678         }
6679         /*
6680          * take off the sendall flag, it would be bad if we failed to do
6681          * this :-0
6682          */
6683         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6684         /* get length and mbuf chain */
6685         if (uio) {
6686                 ca->sndlen = uio->uio_resid;
6687                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6688                 if (ca->m == NULL) {
6689                         SCTP_FREE(ca, SCTP_M_COPYAL);
6690                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6691                         return (ENOMEM);
6692                 }
6693         } else {
6694                 /* Gather the length of the send */
6695                 struct mbuf *mat;
6696
6697                 mat = m;
6698                 ca->sndlen = 0;
6699                 while (m) {
6700                         ca->sndlen += SCTP_BUF_LEN(m);
6701                         m = SCTP_BUF_NEXT(m);
6702                 }
6703                 ca->m = mat;
6704         }
6705         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6706             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6707             SCTP_ASOC_ANY_STATE,
6708             (void *)ca, 0,
6709             sctp_sendall_completes, inp, 1);
6710         if (ret) {
6711                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6712                 SCTP_FREE(ca, SCTP_M_COPYAL);
6713                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6714                 return (EFAULT);
6715         }
6716         return (0);
6717 }
6718
6719
6720 void
6721 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6722 {
6723         struct sctp_tmit_chunk *chk, *nchk;
6724
6725         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6726                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6727                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6728                         if (chk->data) {
6729                                 sctp_m_freem(chk->data);
6730                                 chk->data = NULL;
6731                         }
6732                         asoc->ctrl_queue_cnt--;
6733                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6734                 }
6735         }
6736 }
6737
6738 void
6739 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6740 {
6741         struct sctp_association *asoc;
6742         struct sctp_tmit_chunk *chk, *nchk;
6743         struct sctp_asconf_chunk *acp;
6744
6745         asoc = &stcb->asoc;
6746         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6747                 /* find SCTP_ASCONF chunk in queue */
6748                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6749                         if (chk->data) {
6750                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6751                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6752                                         /* Not Acked yet */
6753                                         break;
6754                                 }
6755                         }
6756                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6757                         if (chk->data) {
6758                                 sctp_m_freem(chk->data);
6759                                 chk->data = NULL;
6760                         }
6761                         asoc->ctrl_queue_cnt--;
6762                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6763                 }
6764         }
6765 }
6766
6767
6768 static void
6769 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6770     struct sctp_association *asoc,
6771     struct sctp_tmit_chunk **data_list,
6772     int bundle_at,
6773     struct sctp_nets *net)
6774 {
6775         int i;
6776         struct sctp_tmit_chunk *tp1;
6777
6778         for (i = 0; i < bundle_at; i++) {
6779                 /* off of the send queue */
6780                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6781                 asoc->send_queue_cnt--;
6782                 if (i > 0) {
6783                         /*
6784                          * Any chunk NOT 0 you zap the time chunk 0 gets
6785                          * zapped or set based on if a RTO measurment is
6786                          * needed.
6787                          */
6788                         data_list[i]->do_rtt = 0;
6789                 }
6790                 /* record time */
6791                 data_list[i]->sent_rcv_time = net->last_sent_time;
6792                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6793                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6794                 if (data_list[i]->whoTo == NULL) {
6795                         data_list[i]->whoTo = net;
6796                         atomic_add_int(&net->ref_count, 1);
6797                 }
6798                 /* on to the sent queue */
6799                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6800                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6801                         struct sctp_tmit_chunk *tpp;
6802
6803                         /* need to move back */
6804         back_up_more:
6805                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6806                         if (tpp == NULL) {
6807                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6808                                 goto all_done;
6809                         }
6810                         tp1 = tpp;
6811                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6812                                 goto back_up_more;
6813                         }
6814                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6815                 } else {
6816                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6817                             data_list[i],
6818                             sctp_next);
6819                 }
6820 all_done:
6821                 /* This does not lower until the cum-ack passes it */
6822                 asoc->sent_queue_cnt++;
6823                 if ((asoc->peers_rwnd <= 0) &&
6824                     (asoc->total_flight == 0) &&
6825                     (bundle_at == 1)) {
6826                         /* Mark the chunk as being a window probe */
6827                         SCTP_STAT_INCR(sctps_windowprobed);
6828                 }
6829 #ifdef SCTP_AUDITING_ENABLED
6830                 sctp_audit_log(0xC2, 3);
6831 #endif
6832                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6833                 data_list[i]->snd_count = 1;
6834                 data_list[i]->rec.data.chunk_was_revoked = 0;
6835                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6836                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6837                             data_list[i]->whoTo->flight_size,
6838                             data_list[i]->book_size,
6839                             (uintptr_t) data_list[i]->whoTo,
6840                             data_list[i]->rec.data.TSN_seq);
6841                 }
6842                 sctp_flight_size_increase(data_list[i]);
6843                 sctp_total_flight_increase(stcb, data_list[i]);
6844                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6845                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6846                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6847                 }
6848                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6849                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6850                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6851                         /* SWS sender side engages */
6852                         asoc->peers_rwnd = 0;
6853                 }
6854         }
6855         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6856                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6857         }
6858 }
6859
6860 static void
6861 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6862 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6863     SCTP_UNUSED
6864 #endif
6865 )
6866 {
6867         struct sctp_tmit_chunk *chk, *nchk;
6868
6869         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6870                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6871                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6872                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6873                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6874                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6875                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6876                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6877                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6878                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6879                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6880                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6881                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6882                         /* Stray chunks must be cleaned up */
6883         clean_up_anyway:
6884                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6885                         if (chk->data) {
6886                                 sctp_m_freem(chk->data);
6887                                 chk->data = NULL;
6888                         }
6889                         asoc->ctrl_queue_cnt--;
6890                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6891                                 asoc->fwd_tsn_cnt--;
6892                         sctp_free_a_chunk(stcb, chk, so_locked);
6893                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6894                         /* special handling, we must look into the param */
6895                         if (chk != asoc->str_reset) {
6896                                 goto clean_up_anyway;
6897                         }
6898                 }
6899         }
6900 }
6901
6902
6903 static int
6904 sctp_can_we_split_this(struct sctp_tcb *stcb,
6905     uint32_t length,
6906     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6907 {
6908         /*
6909          * Make a decision on if I should split a msg into multiple parts.
6910          * This is only asked of incomplete messages.
6911          */
6912         if (eeor_on) {
6913                 /*
6914                  * If we are doing EEOR we need to always send it if its the
6915                  * entire thing, since it might be all the guy is putting in
6916                  * the hopper.
6917                  */
6918                 if (goal_mtu >= length) {
6919                         /*-
6920                          * If we have data outstanding,
6921                          * we get another chance when the sack
6922                          * arrives to transmit - wait for more data
6923                          */
6924                         if (stcb->asoc.total_flight == 0) {
6925                                 /*
6926                                  * If nothing is in flight, we zero the
6927                                  * packet counter.
6928                                  */
6929                                 return (length);
6930                         }
6931                         return (0);
6932
6933                 } else {
6934                         /* You can fill the rest */
6935                         return (goal_mtu);
6936                 }
6937         }
6938         /*-
6939          * For those strange folk that make the send buffer
6940          * smaller than our fragmentation point, we can't
6941          * get a full msg in so we have to allow splitting.
6942          */
6943         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6944                 return (length);
6945         }
6946         if ((length <= goal_mtu) ||
6947             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6948                 /* Sub-optimial residual don't split in non-eeor mode. */
6949                 return (0);
6950         }
6951         /*
6952          * If we reach here length is larger than the goal_mtu. Do we wish
6953          * to split it for the sake of packet putting together?
6954          */
6955         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6956                 /* Its ok to split it */
6957                 return (min(goal_mtu, frag_point));
6958         }
6959         /* Nope, can't split */
6960         return (0);
6961
6962 }
6963
6964 static uint32_t
6965 sctp_move_to_outqueue(struct sctp_tcb *stcb,
6966     struct sctp_stream_out *strq,
6967     uint32_t goal_mtu,
6968     uint32_t frag_point,
6969     int *locked,
6970     int *giveup,
6971     int eeor_mode,
6972     int *bail,
6973     int so_locked
6974 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6975     SCTP_UNUSED
6976 #endif
6977 )
6978 {
6979         /* Move from the stream to the send_queue keeping track of the total */
6980         struct sctp_association *asoc;
6981         struct sctp_stream_queue_pending *sp;
6982         struct sctp_tmit_chunk *chk;
6983         struct sctp_data_chunk *dchkh;
6984         uint32_t to_move, length;
6985         uint8_t rcv_flags = 0;
6986         uint8_t some_taken;
6987         uint8_t send_lock_up = 0;
6988
6989         SCTP_TCB_LOCK_ASSERT(stcb);
6990         asoc = &stcb->asoc;
6991 one_more_time:
6992         /* sa_ignore FREED_MEMORY */
6993         sp = TAILQ_FIRST(&strq->outqueue);
6994         if (sp == NULL) {
6995                 *locked = 0;
6996                 if (send_lock_up == 0) {
6997                         SCTP_TCB_SEND_LOCK(stcb);
6998                         send_lock_up = 1;
6999                 }
7000                 sp = TAILQ_FIRST(&strq->outqueue);
7001                 if (sp) {
7002                         goto one_more_time;
7003                 }
7004                 if (strq->last_msg_incomplete) {
7005                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7006                             strq->stream_no,
7007                             strq->last_msg_incomplete);
7008                         strq->last_msg_incomplete = 0;
7009                 }
7010                 to_move = 0;
7011                 if (send_lock_up) {
7012                         SCTP_TCB_SEND_UNLOCK(stcb);
7013                         send_lock_up = 0;
7014                 }
7015                 goto out_of;
7016         }
7017         if ((sp->msg_is_complete) && (sp->length == 0)) {
7018                 if (sp->sender_all_done) {
7019                         /*
7020                          * We are doing differed cleanup. Last time through
7021                          * when we took all the data the sender_all_done was
7022                          * not set.
7023                          */
7024                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7025                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7026                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7027                                     sp->sender_all_done,
7028                                     sp->length,
7029                                     sp->msg_is_complete,
7030                                     sp->put_last_out,
7031                                     send_lock_up);
7032                         }
7033                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7034                                 SCTP_TCB_SEND_LOCK(stcb);
7035                                 send_lock_up = 1;
7036                         }
7037                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7038                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7039                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7040                         if (sp->net) {
7041                                 sctp_free_remote_addr(sp->net);
7042                                 sp->net = NULL;
7043                         }
7044                         if (sp->data) {
7045                                 sctp_m_freem(sp->data);
7046                                 sp->data = NULL;
7047                         }
7048                         sctp_free_a_strmoq(stcb, sp, so_locked);
7049                         /* we can't be locked to it */
7050                         *locked = 0;
7051                         stcb->asoc.locked_on_sending = NULL;
7052                         if (send_lock_up) {
7053                                 SCTP_TCB_SEND_UNLOCK(stcb);
7054                                 send_lock_up = 0;
7055                         }
7056                         /* back to get the next msg */
7057                         goto one_more_time;
7058                 } else {
7059                         /*
7060                          * sender just finished this but still holds a
7061                          * reference
7062                          */
7063                         *locked = 1;
7064                         *giveup = 1;
7065                         to_move = 0;
7066                         goto out_of;
7067                 }
7068         } else {
7069                 /* is there some to get */
7070                 if (sp->length == 0) {
7071                         /* no */
7072                         *locked = 1;
7073                         *giveup = 1;
7074                         to_move = 0;
7075                         goto out_of;
7076                 } else if (sp->discard_rest) {
7077                         if (send_lock_up == 0) {
7078                                 SCTP_TCB_SEND_LOCK(stcb);
7079                                 send_lock_up = 1;
7080                         }
7081                         /* Whack down the size */
7082                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7083                         if ((stcb->sctp_socket != NULL) && \
7084                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7085                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7086                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7087                         }
7088                         if (sp->data) {
7089                                 sctp_m_freem(sp->data);
7090                                 sp->data = NULL;
7091                                 sp->tail_mbuf = NULL;
7092                         }
7093                         sp->length = 0;
7094                         sp->some_taken = 1;
7095                         *locked = 1;
7096                         *giveup = 1;
7097                         to_move = 0;
7098                         goto out_of;
7099                 }
7100         }
7101         some_taken = sp->some_taken;
7102         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7103                 sp->msg_is_complete = 1;
7104         }
7105 re_look:
7106         length = sp->length;
7107         if (sp->msg_is_complete) {
7108                 /* The message is complete */
7109                 to_move = min(length, frag_point);
7110                 if (to_move == length) {
7111                         /* All of it fits in the MTU */
7112                         if (sp->some_taken) {
7113                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7114                                 sp->put_last_out = 1;
7115                         } else {
7116                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7117                                 sp->put_last_out = 1;
7118                         }
7119                 } else {
7120                         /* Not all of it fits, we fragment */
7121                         if (sp->some_taken == 0) {
7122                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7123                         }
7124                         sp->some_taken = 1;
7125                 }
7126         } else {
7127                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7128                 if (to_move) {
7129                         /*-
7130                          * We use a snapshot of length in case it
7131                          * is expanding during the compare.
7132                          */
7133                         uint32_t llen;
7134
7135                         llen = length;
7136                         if (to_move >= llen) {
7137                                 to_move = llen;
7138                                 if (send_lock_up == 0) {
7139                                         /*-
7140                                          * We are taking all of an incomplete msg
7141                                          * thus we need a send lock.
7142                                          */
7143                                         SCTP_TCB_SEND_LOCK(stcb);
7144                                         send_lock_up = 1;
7145                                         if (sp->msg_is_complete) {
7146                                                 /*
7147                                                  * the sender finished the
7148                                                  * msg
7149                                                  */
7150                                                 goto re_look;
7151                                         }
7152                                 }
7153                         }
7154                         if (sp->some_taken == 0) {
7155                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7156                                 sp->some_taken = 1;
7157                         }
7158                 } else {
7159                         /* Nothing to take. */
7160                         if (sp->some_taken) {
7161                                 *locked = 1;
7162                         }
7163                         *giveup = 1;
7164                         to_move = 0;
7165                         goto out_of;
7166                 }
7167         }
7168
7169         /* If we reach here, we can copy out a chunk */
7170         sctp_alloc_a_chunk(stcb, chk);
7171         if (chk == NULL) {
7172                 /* No chunk memory */
7173                 *giveup = 1;
7174                 to_move = 0;
7175                 goto out_of;
7176         }
7177         /*
7178          * Setup for unordered if needed by looking at the user sent info
7179          * flags.
7180          */
7181         if (sp->sinfo_flags & SCTP_UNORDERED) {
7182                 rcv_flags |= SCTP_DATA_UNORDERED;
7183         }
7184         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7185             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7186                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7187         }
7188         /* clear out the chunk before setting up */
7189         memset(chk, 0, sizeof(*chk));
7190         chk->rec.data.rcv_flags = rcv_flags;
7191
7192         if (to_move >= length) {
7193                 /* we think we can steal the whole thing */
7194                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7195                         SCTP_TCB_SEND_LOCK(stcb);
7196                         send_lock_up = 1;
7197                 }
7198                 if (to_move < sp->length) {
7199                         /* bail, it changed */
7200                         goto dont_do_it;
7201                 }
7202                 chk->data = sp->data;
7203                 chk->last_mbuf = sp->tail_mbuf;
7204                 /* register the stealing */
7205                 sp->data = sp->tail_mbuf = NULL;
7206         } else {
7207                 struct mbuf *m;
7208
7209 dont_do_it:
7210                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7211                 chk->last_mbuf = NULL;
7212                 if (chk->data == NULL) {
7213                         sp->some_taken = some_taken;
7214                         sctp_free_a_chunk(stcb, chk, so_locked);
7215                         *bail = 1;
7216                         to_move = 0;
7217                         goto out_of;
7218                 }
7219 #ifdef SCTP_MBUF_LOGGING
7220                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7221                         struct mbuf *mat;
7222
7223                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7224                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7225                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7226                                 }
7227                         }
7228                 }
7229 #endif
7230                 /* Pull off the data */
7231                 m_adj(sp->data, to_move);
7232                 /* Now lets work our way down and compact it */
7233                 m = sp->data;
7234                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7235                         sp->data = SCTP_BUF_NEXT(m);
7236                         SCTP_BUF_NEXT(m) = NULL;
7237                         if (sp->tail_mbuf == m) {
7238                                 /*-
7239                                  * Freeing tail? TSNH since
7240                                  * we supposedly were taking less
7241                                  * than the sp->length.
7242                                  */
7243 #ifdef INVARIANTS
7244                                 panic("Huh, freing tail? - TSNH");
7245 #else
7246                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7247                                 sp->tail_mbuf = sp->data = NULL;
7248                                 sp->length = 0;
7249 #endif
7250
7251                         }
7252                         sctp_m_free(m);
7253                         m = sp->data;
7254                 }
7255         }
7256         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7257                 chk->copy_by_ref = 1;
7258         } else {
7259                 chk->copy_by_ref = 0;
7260         }
7261         /*
7262          * get last_mbuf and counts of mb useage This is ugly but hopefully
7263          * its only one mbuf.
7264          */
7265         if (chk->last_mbuf == NULL) {
7266                 chk->last_mbuf = chk->data;
7267                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7268                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7269                 }
7270         }
7271         if (to_move > length) {
7272                 /*- This should not happen either
7273                  * since we always lower to_move to the size
7274                  * of sp->length if its larger.
7275                  */
7276 #ifdef INVARIANTS
7277                 panic("Huh, how can to_move be larger?");
7278 #else
7279                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7280                 sp->length = 0;
7281 #endif
7282         } else {
7283                 atomic_subtract_int(&sp->length, to_move);
7284         }
7285         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7286                 /* Not enough room for a chunk header, get some */
7287                 struct mbuf *m;
7288
7289                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7290                 if (m == NULL) {
7291                         /*
7292                          * we're in trouble here. _PREPEND below will free
7293                          * all the data if there is no leading space, so we
7294                          * must put the data back and restore.
7295                          */
7296                         if (send_lock_up == 0) {
7297                                 SCTP_TCB_SEND_LOCK(stcb);
7298                                 send_lock_up = 1;
7299                         }
7300                         if (chk->data == NULL) {
7301                                 /* unsteal the data */
7302                                 sp->data = chk->data;
7303                                 sp->tail_mbuf = chk->last_mbuf;
7304                         } else {
7305                                 struct mbuf *m_tmp;
7306
7307                                 /* reassemble the data */
7308                                 m_tmp = sp->data;
7309                                 sp->data = chk->data;
7310                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7311                         }
7312                         sp->some_taken = some_taken;
7313                         atomic_add_int(&sp->length, to_move);
7314                         chk->data = NULL;
7315                         *bail = 1;
7316                         sctp_free_a_chunk(stcb, chk, so_locked);
7317                         to_move = 0;
7318                         goto out_of;
7319                 } else {
7320                         SCTP_BUF_LEN(m) = 0;
7321                         SCTP_BUF_NEXT(m) = chk->data;
7322                         chk->data = m;
7323                         M_ALIGN(chk->data, 4);
7324                 }
7325         }
7326         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7327         if (chk->data == NULL) {
7328                 /* HELP, TSNH since we assured it would not above? */
7329 #ifdef INVARIANTS
7330                 panic("prepend failes HELP?");
7331 #else
7332                 SCTP_PRINTF("prepend fails HELP?\n");
7333                 sctp_free_a_chunk(stcb, chk, so_locked);
7334 #endif
7335                 *bail = 1;
7336                 to_move = 0;
7337                 goto out_of;
7338         }
7339         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7340         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7341         chk->book_size_scale = 0;
7342         chk->sent = SCTP_DATAGRAM_UNSENT;
7343
7344         chk->flags = 0;
7345         chk->asoc = &stcb->asoc;
7346         chk->pad_inplace = 0;
7347         chk->no_fr_allowed = 0;
7348         chk->rec.data.stream_seq = strq->next_sequence_send;
7349         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7350                 strq->next_sequence_send++;
7351         }
7352         chk->rec.data.stream_number = sp->stream;
7353         chk->rec.data.payloadtype = sp->ppid;
7354         chk->rec.data.context = sp->context;
7355         chk->rec.data.doing_fast_retransmit = 0;
7356
7357         chk->rec.data.timetodrop = sp->ts;
7358         chk->flags = sp->act_flags;
7359
7360         if (sp->net) {
7361                 chk->whoTo = sp->net;
7362                 atomic_add_int(&chk->whoTo->ref_count, 1);
7363         } else
7364                 chk->whoTo = NULL;
7365
7366         if (sp->holds_key_ref) {
7367                 chk->auth_keyid = sp->auth_keyid;
7368                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7369                 chk->holds_key_ref = 1;
7370         }
7371         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7372         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7373                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7374                     (uintptr_t) stcb, sp->length,
7375                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7376                     chk->rec.data.TSN_seq);
7377         }
7378         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7379         /*
7380          * Put the rest of the things in place now. Size was done earlier in
7381          * previous loop prior to padding.
7382          */
7383
7384 #ifdef SCTP_ASOCLOG_OF_TSNS
7385         SCTP_TCB_LOCK_ASSERT(stcb);
7386         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7387                 asoc->tsn_out_at = 0;
7388                 asoc->tsn_out_wrapped = 1;
7389         }
7390         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7391         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7392         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7393         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7394         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7395         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7396         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7397         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7398         asoc->tsn_out_at++;
7399 #endif
7400
7401         dchkh->ch.chunk_type = SCTP_DATA;
7402         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7403         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7404         dchkh->dp.stream_id = htons(strq->stream_no);
7405         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7406         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7407         dchkh->ch.chunk_length = htons(chk->send_size);
7408         /* Now advance the chk->send_size by the actual pad needed. */
7409         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7410                 /* need a pad */
7411                 struct mbuf *lm;
7412                 int pads;
7413
7414                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7415                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7416                         chk->pad_inplace = 1;
7417                 }
7418                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7419                         /* pad added an mbuf */
7420                         chk->last_mbuf = lm;
7421                 }
7422                 chk->send_size += pads;
7423         }
7424         /* We only re-set the policy if it is on */
7425         if (sp->pr_sctp_on) {
7426                 sctp_set_prsctp_policy(sp);
7427                 asoc->pr_sctp_cnt++;
7428                 chk->pr_sctp_on = 1;
7429         } else {
7430                 chk->pr_sctp_on = 0;
7431         }
7432         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7433                 /* All done pull and kill the message */
7434                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7435                 if (sp->put_last_out == 0) {
7436                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7437                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7438                             sp->sender_all_done,
7439                             sp->length,
7440                             sp->msg_is_complete,
7441                             sp->put_last_out,
7442                             send_lock_up);
7443                 }
7444                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7445                         SCTP_TCB_SEND_LOCK(stcb);
7446                         send_lock_up = 1;
7447                 }
7448                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7449                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7450                 if (sp->net) {
7451                         sctp_free_remote_addr(sp->net);
7452                         sp->net = NULL;
7453                 }
7454                 if (sp->data) {
7455                         sctp_m_freem(sp->data);
7456                         sp->data = NULL;
7457                 }
7458                 sctp_free_a_strmoq(stcb, sp, so_locked);
7459
7460                 /* we can't be locked to it */
7461                 *locked = 0;
7462                 stcb->asoc.locked_on_sending = NULL;
7463         } else {
7464                 /* more to go, we are locked */
7465                 *locked = 1;
7466         }
7467         asoc->chunks_on_out_queue++;
7468         strq->chunks_on_queues++;
7469         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7470         asoc->send_queue_cnt++;
7471 out_of:
7472         if (send_lock_up) {
7473                 SCTP_TCB_SEND_UNLOCK(stcb);
7474         }
7475         return (to_move);
7476 }
7477
7478
7479 static void
7480 sctp_fill_outqueue(struct sctp_tcb *stcb,
7481     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7482 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7483     SCTP_UNUSED
7484 #endif
7485 )
7486 {
7487         struct sctp_association *asoc;
7488         struct sctp_stream_out *strq;
7489         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7490         int locked, giveup;
7491
7492         SCTP_TCB_LOCK_ASSERT(stcb);
7493         asoc = &stcb->asoc;
7494         switch (net->ro._l_addr.sa.sa_family) {
7495 #ifdef INET
7496         case AF_INET:
7497                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7498                 break;
7499 #endif
7500 #ifdef INET6
7501         case AF_INET6:
7502                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7503                 break;
7504 #endif
7505         default:
7506                 /* TSNH */
7507                 goal_mtu = net->mtu;
7508                 break;
7509         }
7510         /* Need an allowance for the data chunk header too */
7511         goal_mtu -= sizeof(struct sctp_data_chunk);
7512
7513         /* must make even word boundary */
7514         goal_mtu &= 0xfffffffc;
7515         if (asoc->locked_on_sending) {
7516                 /* We are stuck on one stream until the message completes. */
7517                 strq = asoc->locked_on_sending;
7518                 locked = 1;
7519         } else {
7520                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7521                 locked = 0;
7522         }
7523         while ((goal_mtu > 0) && strq) {
7524                 giveup = 0;
7525                 bail = 0;
7526                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7527                     &giveup, eeor_mode, &bail, so_locked);
7528                 if (moved_how_much)
7529                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7530
7531                 if (locked) {
7532                         asoc->locked_on_sending = strq;
7533                         if ((moved_how_much == 0) || (giveup) || bail)
7534                                 /* no more to move for now */
7535                                 break;
7536                 } else {
7537                         asoc->locked_on_sending = NULL;
7538                         if ((giveup) || bail) {
7539                                 break;
7540                         }
7541                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7542                         if (strq == NULL) {
7543                                 break;
7544                         }
7545                 }
7546                 total_moved += moved_how_much;
7547                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7548                 goal_mtu &= 0xfffffffc;
7549         }
7550         if (bail)
7551                 *quit_now = 1;
7552
7553         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7554
7555         if (total_moved == 0) {
7556                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7557                     (net == stcb->asoc.primary_destination)) {
7558                         /* ran dry for primary network net */
7559                         SCTP_STAT_INCR(sctps_primary_randry);
7560                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7561                         /* ran dry with CMT on */
7562                         SCTP_STAT_INCR(sctps_cmt_randry);
7563                 }
7564         }
7565 }
7566
7567 void
7568 sctp_fix_ecn_echo(struct sctp_association *asoc)
7569 {
7570         struct sctp_tmit_chunk *chk;
7571
7572         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7573                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7574                         chk->sent = SCTP_DATAGRAM_UNSENT;
7575                 }
7576         }
7577 }
7578
7579 void
7580 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7581 {
7582         struct sctp_association *asoc;
7583         struct sctp_tmit_chunk *chk;
7584         struct sctp_stream_queue_pending *sp;
7585         unsigned int i;
7586
7587         if (net == NULL) {
7588                 return;
7589         }
7590         asoc = &stcb->asoc;
7591         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7592                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7593                         if (sp->net == net) {
7594                                 sctp_free_remote_addr(sp->net);
7595                                 sp->net = NULL;
7596                         }
7597                 }
7598         }
7599         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7600                 if (chk->whoTo == net) {
7601                         sctp_free_remote_addr(chk->whoTo);
7602                         chk->whoTo = NULL;
7603                 }
7604         }
7605 }
7606
7607 int
7608 sctp_med_chunk_output(struct sctp_inpcb *inp,
7609     struct sctp_tcb *stcb,
7610     struct sctp_association *asoc,
7611     int *num_out,
7612     int *reason_code,
7613     int control_only, int from_where,
7614     struct timeval *now, int *now_filled, int frag_point, int so_locked
7615 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7616     SCTP_UNUSED
7617 #endif
7618 )
7619 {
7620         /*
7621          * Ok this is the generic chunk service queue. we must do the
7622          * following: - Service the stream queue that is next, moving any
7623          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7624          * LAST to the out queue in one pass) and assigning TSN's - Check to
7625          * see if the cwnd/rwnd allows any output, if so we go ahead and
7626          * fomulate and send the low level chunks. Making sure to combine
7627          * any control in the control chunk queue also.
7628          */
7629         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7630         struct mbuf *outchain, *endoutchain;
7631         struct sctp_tmit_chunk *chk, *nchk;
7632
7633         /* temp arrays for unlinking */
7634         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7635         int no_fragmentflg, error;
7636         unsigned int max_rwnd_per_dest, max_send_per_dest;
7637         int one_chunk, hbflag, skip_data_for_this_net;
7638         int asconf, cookie, no_out_cnt;
7639         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7640         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7641         int tsns_sent = 0;
7642         uint32_t auth_offset = 0;
7643         struct sctp_auth_chunk *auth = NULL;
7644         uint16_t auth_keyid;
7645         int override_ok = 1;
7646         int skip_fill_up = 0;
7647         int data_auth_reqd = 0;
7648
7649         /*
7650          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7651          * destination.
7652          */
7653         int quit_now = 0;
7654
7655         *num_out = 0;
7656         auth_keyid = stcb->asoc.authinfo.active_keyid;
7657
7658         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7659             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7660             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7661                 eeor_mode = 1;
7662         } else {
7663                 eeor_mode = 0;
7664         }
7665         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7666         /*
7667          * First lets prime the pump. For each destination, if there is room
7668          * in the flight size, attempt to pull an MTU's worth out of the
7669          * stream queues into the general send_queue
7670          */
7671 #ifdef SCTP_AUDITING_ENABLED
7672         sctp_audit_log(0xC2, 2);
7673 #endif
7674         SCTP_TCB_LOCK_ASSERT(stcb);
7675         hbflag = 0;
7676         if ((control_only) || (asoc->stream_reset_outstanding))
7677                 no_data_chunks = 1;
7678         else
7679                 no_data_chunks = 0;
7680
7681         /* Nothing to possible to send? */
7682         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7683             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7684             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7685             TAILQ_EMPTY(&asoc->send_queue) &&
7686             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7687 nothing_to_send:
7688                 *reason_code = 9;
7689                 return (0);
7690         }
7691         if (asoc->peers_rwnd == 0) {
7692                 /* No room in peers rwnd */
7693                 *reason_code = 1;
7694                 if (asoc->total_flight > 0) {
7695                         /* we are allowed one chunk in flight */
7696                         no_data_chunks = 1;
7697                 }
7698         }
7699         if (stcb->asoc.ecn_echo_cnt_onq) {
7700                 /* Record where a sack goes, if any */
7701                 if (no_data_chunks &&
7702                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7703                         /* Nothing but ECNe to send - we don't do that */
7704                         goto nothing_to_send;
7705                 }
7706                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7707                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7708                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7709                                 sack_goes_to = chk->whoTo;
7710                                 break;
7711                         }
7712                 }
7713         }
7714         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7715         if (stcb->sctp_socket)
7716                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7717         else
7718                 max_send_per_dest = 0;
7719         if (no_data_chunks == 0) {
7720                 /* How many non-directed chunks are there? */
7721                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7722                         if (chk->whoTo == NULL) {
7723                                 /*
7724                                  * We already have non-directed chunks on
7725                                  * the queue, no need to do a fill-up.
7726                                  */
7727                                 skip_fill_up = 1;
7728                                 break;
7729                         }
7730                 }
7731
7732         }
7733         if ((no_data_chunks == 0) &&
7734             (skip_fill_up == 0) &&
7735             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7736                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7737                         /*
7738                          * This for loop we are in takes in each net, if
7739                          * its's got space in cwnd and has data sent to it
7740                          * (when CMT is off) then it calls
7741                          * sctp_fill_outqueue for the net. This gets data on
7742                          * the send queue for that network.
7743                          *
7744                          * In sctp_fill_outqueue TSN's are assigned and data is
7745                          * copied out of the stream buffers. Note mostly
7746                          * copy by reference (we hope).
7747                          */
7748                         net->window_probe = 0;
7749                         if ((net != stcb->asoc.alternate) &&
7750                             ((net->dest_state & SCTP_ADDR_PF) ||
7751                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7752                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7753                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7754                                         sctp_log_cwnd(stcb, net, 1,
7755                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7756                                 }
7757                                 continue;
7758                         }
7759                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7760                             (net->flight_size == 0)) {
7761                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7762                         }
7763                         if (net->flight_size >= net->cwnd) {
7764                                 /* skip this network, no room - can't fill */
7765                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7766                                         sctp_log_cwnd(stcb, net, 3,
7767                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7768                                 }
7769                                 continue;
7770                         }
7771                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7772                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7773                         }
7774                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7775                         if (quit_now) {
7776                                 /* memory alloc failure */
7777                                 no_data_chunks = 1;
7778                                 break;
7779                         }
7780                 }
7781         }
7782         /* now service each destination and send out what we can for it */
7783         /* Nothing to send? */
7784         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7785             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7786             TAILQ_EMPTY(&asoc->send_queue)) {
7787                 *reason_code = 8;
7788                 return (0);
7789         }
7790         if (asoc->sctp_cmt_on_off > 0) {
7791                 /* get the last start point */
7792                 start_at = asoc->last_net_cmt_send_started;
7793                 if (start_at == NULL) {
7794                         /* null so to beginning */
7795                         start_at = TAILQ_FIRST(&asoc->nets);
7796                 } else {
7797                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7798                         if (start_at == NULL) {
7799                                 start_at = TAILQ_FIRST(&asoc->nets);
7800                         }
7801                 }
7802                 asoc->last_net_cmt_send_started = start_at;
7803         } else {
7804                 start_at = TAILQ_FIRST(&asoc->nets);
7805         }
7806         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7807                 if (chk->whoTo == NULL) {
7808                         if (asoc->alternate) {
7809                                 chk->whoTo = asoc->alternate;
7810                         } else {
7811                                 chk->whoTo = asoc->primary_destination;
7812                         }
7813                         atomic_add_int(&chk->whoTo->ref_count, 1);
7814                 }
7815         }
7816         old_start_at = NULL;
7817 again_one_more_time:
7818         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7819                 /* how much can we send? */
7820                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7821                 if (old_start_at && (old_start_at == net)) {
7822                         /* through list ocmpletely. */
7823                         break;
7824                 }
7825                 tsns_sent = 0xa;
7826                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7827                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7828                     (net->flight_size >= net->cwnd)) {
7829                         /*
7830                          * Nothing on control or asconf and flight is full,
7831                          * we can skip even in the CMT case.
7832                          */
7833                         continue;
7834                 }
7835                 bundle_at = 0;
7836                 endoutchain = outchain = NULL;
7837                 no_fragmentflg = 1;
7838                 one_chunk = 0;
7839                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7840                         skip_data_for_this_net = 1;
7841                 } else {
7842                         skip_data_for_this_net = 0;
7843                 }
7844                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7845                         /*
7846                          * if we have a route and an ifp check to see if we
7847                          * have room to send to this guy
7848                          */
7849                         struct ifnet *ifp;
7850
7851                         ifp = net->ro.ro_rt->rt_ifp;
7852                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7853                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7854                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7855                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7856                                 }
7857                                 continue;
7858                         }
7859                 }
7860                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7861 #ifdef INET
7862                 case AF_INET:
7863                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7864                         break;
7865 #endif
7866 #ifdef INET6
7867                 case AF_INET6:
7868                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7869                         break;
7870 #endif
7871                 default:
7872                         /* TSNH */
7873                         mtu = net->mtu;
7874                         break;
7875                 }
7876                 mx_mtu = mtu;
7877                 to_out = 0;
7878                 if (mtu > asoc->peers_rwnd) {
7879                         if (asoc->total_flight > 0) {
7880                                 /* We have a packet in flight somewhere */
7881                                 r_mtu = asoc->peers_rwnd;
7882                         } else {
7883                                 /* We are always allowed to send one MTU out */
7884                                 one_chunk = 1;
7885                                 r_mtu = mtu;
7886                         }
7887                 } else {
7888                         r_mtu = mtu;
7889                 }
7890                 /************************/
7891                 /* ASCONF transmission */
7892                 /************************/
7893                 /* Now first lets go through the asconf queue */
7894                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7895                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7896                                 continue;
7897                         }
7898                         if (chk->whoTo == NULL) {
7899                                 if (asoc->alternate == NULL) {
7900                                         if (asoc->primary_destination != net) {
7901                                                 break;
7902                                         }
7903                                 } else {
7904                                         if (asoc->alternate != net) {
7905                                                 break;
7906                                         }
7907                                 }
7908                         } else {
7909                                 if (chk->whoTo != net) {
7910                                         break;
7911                                 }
7912                         }
7913                         if (chk->data == NULL) {
7914                                 break;
7915                         }
7916                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7917                             chk->sent != SCTP_DATAGRAM_RESEND) {
7918                                 break;
7919                         }
7920                         /*
7921                          * if no AUTH is yet included and this chunk
7922                          * requires it, make sure to account for it.  We
7923                          * don't apply the size until the AUTH chunk is
7924                          * actually added below in case there is no room for
7925                          * this chunk. NOTE: we overload the use of "omtu"
7926                          * here
7927                          */
7928                         if ((auth == NULL) &&
7929                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7930                             stcb->asoc.peer_auth_chunks)) {
7931                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7932                         } else
7933                                 omtu = 0;
7934                         /* Here we do NOT factor the r_mtu */
7935                         if ((chk->send_size < (int)(mtu - omtu)) ||
7936                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7937                                 /*
7938                                  * We probably should glom the mbuf chain
7939                                  * from the chk->data for control but the
7940                                  * problem is it becomes yet one more level
7941                                  * of tracking to do if for some reason
7942                                  * output fails. Then I have got to
7943                                  * reconstruct the merged control chain.. el
7944                                  * yucko.. for now we take the easy way and
7945                                  * do the copy
7946                                  */
7947                                 /*
7948                                  * Add an AUTH chunk, if chunk requires it
7949                                  * save the offset into the chain for AUTH
7950                                  */
7951                                 if ((auth == NULL) &&
7952                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7953                                     stcb->asoc.peer_auth_chunks))) {
7954                                         outchain = sctp_add_auth_chunk(outchain,
7955                                             &endoutchain,
7956                                             &auth,
7957                                             &auth_offset,
7958                                             stcb,
7959                                             chk->rec.chunk_id.id);
7960                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7961                                 }
7962                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7963                                     (int)chk->rec.chunk_id.can_take_data,
7964                                     chk->send_size, chk->copy_by_ref);
7965                                 if (outchain == NULL) {
7966                                         *reason_code = 8;
7967                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7968                                         return (ENOMEM);
7969                                 }
7970                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7971                                 /* update our MTU size */
7972                                 if (mtu > (chk->send_size + omtu))
7973                                         mtu -= (chk->send_size + omtu);
7974                                 else
7975                                         mtu = 0;
7976                                 to_out += (chk->send_size + omtu);
7977                                 /* Do clear IP_DF ? */
7978                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7979                                         no_fragmentflg = 0;
7980                                 }
7981                                 if (chk->rec.chunk_id.can_take_data)
7982                                         chk->data = NULL;
7983                                 /*
7984                                  * set hb flag since we can use these for
7985                                  * RTO
7986                                  */
7987                                 hbflag = 1;
7988                                 asconf = 1;
7989                                 /*
7990                                  * should sysctl this: don't bundle data
7991                                  * with ASCONF since it requires AUTH
7992                                  */
7993                                 no_data_chunks = 1;
7994                                 chk->sent = SCTP_DATAGRAM_SENT;
7995                                 if (chk->whoTo == NULL) {
7996                                         chk->whoTo = net;
7997                                         atomic_add_int(&net->ref_count, 1);
7998                                 }
7999                                 chk->snd_count++;
8000                                 if (mtu == 0) {
8001                                         /*
8002                                          * Ok we are out of room but we can
8003                                          * output without effecting the
8004                                          * flight size since this little guy
8005                                          * is a control only packet.
8006                                          */
8007                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8008                                         /*
8009                                          * do NOT clear the asconf flag as
8010                                          * it is used to do appropriate
8011                                          * source address selection.
8012                                          */
8013                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8014                                             (struct sockaddr *)&net->ro._l_addr,
8015                                             outchain, auth_offset, auth,
8016                                             stcb->asoc.authinfo.active_keyid,
8017                                             no_fragmentflg, 0, asconf,
8018                                             inp->sctp_lport, stcb->rport,
8019                                             htonl(stcb->asoc.peer_vtag),
8020                                             net->port, NULL,
8021                                             0, 0,
8022                                             so_locked))) {
8023                                                 if (error == ENOBUFS) {
8024                                                         asoc->ifp_had_enobuf = 1;
8025                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8026                                                 }
8027                                                 if (from_where == 0) {
8028                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8029                                                 }
8030                                                 if (*now_filled == 0) {
8031                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8032                                                         *now_filled = 1;
8033                                                         *now = net->last_sent_time;
8034                                                 } else {
8035                                                         net->last_sent_time = *now;
8036                                                 }
8037                                                 hbflag = 0;
8038                                                 /* error, could not output */
8039                                                 if (error == EHOSTUNREACH) {
8040                                                         /*
8041                                                          * Destination went
8042                                                          * unreachable
8043                                                          * during this send
8044                                                          */
8045                                                         sctp_move_chunks_from_net(stcb, net);
8046                                                 }
8047                                                 *reason_code = 7;
8048                                                 continue;
8049                                         } else
8050                                                 asoc->ifp_had_enobuf = 0;
8051                                         if (*now_filled == 0) {
8052                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8053                                                 *now_filled = 1;
8054                                                 *now = net->last_sent_time;
8055                                         } else {
8056                                                 net->last_sent_time = *now;
8057                                         }
8058                                         hbflag = 0;
8059                                         /*
8060                                          * increase the number we sent, if a
8061                                          * cookie is sent we don't tell them
8062                                          * any was sent out.
8063                                          */
8064                                         outchain = endoutchain = NULL;
8065                                         auth = NULL;
8066                                         auth_offset = 0;
8067                                         if (!no_out_cnt)
8068                                                 *num_out += ctl_cnt;
8069                                         /* recalc a clean slate and setup */
8070                                         switch (net->ro._l_addr.sa.sa_family) {
8071 #ifdef INET
8072                                         case AF_INET:
8073                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8074                                                 break;
8075 #endif
8076 #ifdef INET6
8077                                         case AF_INET6:
8078                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8079                                                 break;
8080 #endif
8081                                         default:
8082                                                 /* TSNH */
8083                                                 mtu = net->mtu;
8084                                                 break;
8085                                         }
8086                                         to_out = 0;
8087                                         no_fragmentflg = 1;
8088                                 }
8089                         }
8090                 }
8091                 /************************/
8092                 /* Control transmission */
8093                 /************************/
8094                 /* Now first lets go through the control queue */
8095                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8096                         if ((sack_goes_to) &&
8097                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8098                             (chk->whoTo != sack_goes_to)) {
8099                                 /*
8100                                  * if we have a sack in queue, and we are
8101                                  * looking at an ecn echo that is NOT queued
8102                                  * to where the sack is going..
8103                                  */
8104                                 if (chk->whoTo == net) {
8105                                         /*
8106                                          * Don't transmit it to where its
8107                                          * going (current net)
8108                                          */
8109                                         continue;
8110                                 } else if (sack_goes_to == net) {
8111                                         /*
8112                                          * But do transmit it to this
8113                                          * address
8114                                          */
8115                                         goto skip_net_check;
8116                                 }
8117                         }
8118                         if (chk->whoTo == NULL) {
8119                                 if (asoc->alternate == NULL) {
8120                                         if (asoc->primary_destination != net) {
8121                                                 continue;
8122                                         }
8123                                 } else {
8124                                         if (asoc->alternate != net) {
8125                                                 continue;
8126                                         }
8127                                 }
8128                         } else {
8129                                 if (chk->whoTo != net) {
8130                                         continue;
8131                                 }
8132                         }
8133         skip_net_check:
8134                         if (chk->data == NULL) {
8135                                 continue;
8136                         }
8137                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8138                                 /*
8139                                  * It must be unsent. Cookies and ASCONF's
8140                                  * hang around but there timers will force
8141                                  * when marked for resend.
8142                                  */
8143                                 continue;
8144                         }
8145                         /*
8146                          * if no AUTH is yet included and this chunk
8147                          * requires it, make sure to account for it.  We
8148                          * don't apply the size until the AUTH chunk is
8149                          * actually added below in case there is no room for
8150                          * this chunk. NOTE: we overload the use of "omtu"
8151                          * here
8152                          */
8153                         if ((auth == NULL) &&
8154                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8155                             stcb->asoc.peer_auth_chunks)) {
8156                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8157                         } else
8158                                 omtu = 0;
8159                         /* Here we do NOT factor the r_mtu */
8160                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8161                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8162                                 /*
8163                                  * We probably should glom the mbuf chain
8164                                  * from the chk->data for control but the
8165                                  * problem is it becomes yet one more level
8166                                  * of tracking to do if for some reason
8167                                  * output fails. Then I have got to
8168                                  * reconstruct the merged control chain.. el
8169                                  * yucko.. for now we take the easy way and
8170                                  * do the copy
8171                                  */
8172                                 /*
8173                                  * Add an AUTH chunk, if chunk requires it
8174                                  * save the offset into the chain for AUTH
8175                                  */
8176                                 if ((auth == NULL) &&
8177                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8178                                     stcb->asoc.peer_auth_chunks))) {
8179                                         outchain = sctp_add_auth_chunk(outchain,
8180                                             &endoutchain,
8181                                             &auth,
8182                                             &auth_offset,
8183                                             stcb,
8184                                             chk->rec.chunk_id.id);
8185                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8186                                 }
8187                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8188                                     (int)chk->rec.chunk_id.can_take_data,
8189                                     chk->send_size, chk->copy_by_ref);
8190                                 if (outchain == NULL) {
8191                                         *reason_code = 8;
8192                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8193                                         return (ENOMEM);
8194                                 }
8195                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8196                                 /* update our MTU size */
8197                                 if (mtu > (chk->send_size + omtu))
8198                                         mtu -= (chk->send_size + omtu);
8199                                 else
8200                                         mtu = 0;
8201                                 to_out += (chk->send_size + omtu);
8202                                 /* Do clear IP_DF ? */
8203                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8204                                         no_fragmentflg = 0;
8205                                 }
8206                                 if (chk->rec.chunk_id.can_take_data)
8207                                         chk->data = NULL;
8208                                 /* Mark things to be removed, if needed */
8209                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8210                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8211                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8212                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8213                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8214                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8215                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8216                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8217                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8218                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8219                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8220                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8221                                                 hbflag = 1;
8222                                         }
8223                                         /* remove these chunks at the end */
8224                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8225                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8226                                                 /* turn off the timer */
8227                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8228                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8229                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8230                                                 }
8231                                         }
8232                                         ctl_cnt++;
8233                                 } else {
8234                                         /*
8235                                          * Other chunks, since they have
8236                                          * timers running (i.e. COOKIE) we
8237                                          * just "trust" that it gets sent or
8238                                          * retransmitted.
8239                                          */
8240                                         ctl_cnt++;
8241                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8242                                                 cookie = 1;
8243                                                 no_out_cnt = 1;
8244                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8245                                                 /*
8246                                                  * Increment ecne send count
8247                                                  * here this means we may be
8248                                                  * over-zealous in our
8249                                                  * counting if the send
8250                                                  * fails, but its the best
8251                                                  * place to do it (we used
8252                                                  * to do it in the queue of
8253                                                  * the chunk, but that did
8254                                                  * not tell how many times
8255                                                  * it was sent.
8256                                                  */
8257                                                 SCTP_STAT_INCR(sctps_sendecne);
8258                                         }
8259                                         chk->sent = SCTP_DATAGRAM_SENT;
8260                                         if (chk->whoTo == NULL) {
8261                                                 chk->whoTo = net;
8262                                                 atomic_add_int(&net->ref_count, 1);
8263                                         }
8264                                         chk->snd_count++;
8265                                 }
8266                                 if (mtu == 0) {
8267                                         /*
8268                                          * Ok we are out of room but we can
8269                                          * output without effecting the
8270                                          * flight size since this little guy
8271                                          * is a control only packet.
8272                                          */
8273                                         if (asconf) {
8274                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8275                                                 /*
8276                                                  * do NOT clear the asconf
8277                                                  * flag as it is used to do
8278                                                  * appropriate source
8279                                                  * address selection.
8280                                                  */
8281                                         }
8282                                         if (cookie) {
8283                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8284                                                 cookie = 0;
8285                                         }
8286                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8287                                             (struct sockaddr *)&net->ro._l_addr,
8288                                             outchain,
8289                                             auth_offset, auth,
8290                                             stcb->asoc.authinfo.active_keyid,
8291                                             no_fragmentflg, 0, asconf,
8292                                             inp->sctp_lport, stcb->rport,
8293                                             htonl(stcb->asoc.peer_vtag),
8294                                             net->port, NULL,
8295                                             0, 0,
8296                                             so_locked))) {
8297                                                 if (error == ENOBUFS) {
8298                                                         asoc->ifp_had_enobuf = 1;
8299                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8300                                                 }
8301                                                 if (from_where == 0) {
8302                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8303                                                 }
8304                                                 /* error, could not output */
8305                                                 if (hbflag) {
8306                                                         if (*now_filled == 0) {
8307                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8308                                                                 *now_filled = 1;
8309                                                                 *now = net->last_sent_time;
8310                                                         } else {
8311                                                                 net->last_sent_time = *now;
8312                                                         }
8313                                                         hbflag = 0;
8314                                                 }
8315                                                 if (error == EHOSTUNREACH) {
8316                                                         /*
8317                                                          * Destination went
8318                                                          * unreachable
8319                                                          * during this send
8320                                                          */
8321                                                         sctp_move_chunks_from_net(stcb, net);
8322                                                 }
8323                                                 *reason_code = 7;
8324                                                 continue;
8325                                         } else
8326                                                 asoc->ifp_had_enobuf = 0;
8327                                         /* Only HB or ASCONF advances time */
8328                                         if (hbflag) {
8329                                                 if (*now_filled == 0) {
8330                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8331                                                         *now_filled = 1;
8332                                                         *now = net->last_sent_time;
8333                                                 } else {
8334                                                         net->last_sent_time = *now;
8335                                                 }
8336                                                 hbflag = 0;
8337                                         }
8338                                         /*
8339                                          * increase the number we sent, if a
8340                                          * cookie is sent we don't tell them
8341                                          * any was sent out.
8342                                          */
8343                                         outchain = endoutchain = NULL;
8344                                         auth = NULL;
8345                                         auth_offset = 0;
8346                                         if (!no_out_cnt)
8347                                                 *num_out += ctl_cnt;
8348                                         /* recalc a clean slate and setup */
8349                                         switch (net->ro._l_addr.sa.sa_family) {
8350 #ifdef INET
8351                                         case AF_INET:
8352                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8353                                                 break;
8354 #endif
8355 #ifdef INET6
8356                                         case AF_INET6:
8357                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8358                                                 break;
8359 #endif
8360                                         default:
8361                                                 /* TSNH */
8362                                                 mtu = net->mtu;
8363                                                 break;
8364                                         }
8365                                         to_out = 0;
8366                                         no_fragmentflg = 1;
8367                                 }
8368                         }
8369                 }
8370                 /* JRI: if dest is in PF state, do not send data to it */
8371                 if ((asoc->sctp_cmt_on_off > 0) &&
8372                     (net != stcb->asoc.alternate) &&
8373                     (net->dest_state & SCTP_ADDR_PF)) {
8374                         goto no_data_fill;
8375                 }
8376                 if (net->flight_size >= net->cwnd) {
8377                         goto no_data_fill;
8378                 }
8379                 if ((asoc->sctp_cmt_on_off > 0) &&
8380                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8381                     (net->flight_size > max_rwnd_per_dest)) {
8382                         goto no_data_fill;
8383                 }
8384                 /*
8385                  * We need a specific accounting for the usage of the send
8386                  * buffer. We also need to check the number of messages per
8387                  * net. For now, this is better than nothing and it disabled
8388                  * by default...
8389                  */
8390                 if ((asoc->sctp_cmt_on_off > 0) &&
8391                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8392                     (max_send_per_dest > 0) &&
8393                     (net->flight_size > max_send_per_dest)) {
8394                         goto no_data_fill;
8395                 }
8396                 /*********************/
8397                 /* Data transmission */
8398                 /*********************/
8399                 /*
8400                  * if AUTH for DATA is required and no AUTH has been added
8401                  * yet, account for this in the mtu now... if no data can be
8402                  * bundled, this adjustment won't matter anyways since the
8403                  * packet will be going out...
8404                  */
8405                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8406                     stcb->asoc.peer_auth_chunks);
8407                 if (data_auth_reqd && (auth == NULL)) {
8408                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8409                 }
8410                 /* now lets add any data within the MTU constraints */
8411                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8412 #ifdef INET
8413                 case AF_INET:
8414                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8415                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8416                         else
8417                                 omtu = 0;
8418                         break;
8419 #endif
8420 #ifdef INET6
8421                 case AF_INET6:
8422                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8423                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8424                         else
8425                                 omtu = 0;
8426                         break;
8427 #endif
8428                 default:
8429                         /* TSNH */
8430                         omtu = 0;
8431                         break;
8432                 }
8433                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8434                     (skip_data_for_this_net == 0)) ||
8435                     (cookie)) {
8436                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8437                                 if (no_data_chunks) {
8438                                         /* let only control go out */
8439                                         *reason_code = 1;
8440                                         break;
8441                                 }
8442                                 if (net->flight_size >= net->cwnd) {
8443                                         /* skip this net, no room for data */
8444                                         *reason_code = 2;
8445                                         break;
8446                                 }
8447                                 if ((chk->whoTo != NULL) &&
8448                                     (chk->whoTo != net)) {
8449                                         /* Don't send the chunk on this net */
8450                                         continue;
8451                                 }
8452                                 if (asoc->sctp_cmt_on_off == 0) {
8453                                         if ((asoc->alternate) &&
8454                                             (asoc->alternate != net) &&
8455                                             (chk->whoTo == NULL)) {
8456                                                 continue;
8457                                         } else if ((net != asoc->primary_destination) &&
8458                                                     (asoc->alternate == NULL) &&
8459                                             (chk->whoTo == NULL)) {
8460                                                 continue;
8461                                         }
8462                                 }
8463                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8464                                         /*-
8465                                          * strange, we have a chunk that is
8466                                          * to big for its destination and
8467                                          * yet no fragment ok flag.
8468                                          * Something went wrong when the
8469                                          * PMTU changed...we did not mark
8470                                          * this chunk for some reason?? I
8471                                          * will fix it here by letting IP
8472                                          * fragment it for now and printing
8473                                          * a warning. This really should not
8474                                          * happen ...
8475                                          */
8476                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8477                                             chk->send_size, mtu);
8478                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8479                                 }
8480                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8481                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8482                                         struct sctp_data_chunk *dchkh;
8483
8484                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8485                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8486                                 }
8487                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8488                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8489                                         /* ok we will add this one */
8490
8491                                         /*
8492                                          * Add an AUTH chunk, if chunk
8493                                          * requires it, save the offset into
8494                                          * the chain for AUTH
8495                                          */
8496                                         if (data_auth_reqd) {
8497                                                 if (auth == NULL) {
8498                                                         outchain = sctp_add_auth_chunk(outchain,
8499                                                             &endoutchain,
8500                                                             &auth,
8501                                                             &auth_offset,
8502                                                             stcb,
8503                                                             SCTP_DATA);
8504                                                         auth_keyid = chk->auth_keyid;
8505                                                         override_ok = 0;
8506                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8507                                                 } else if (override_ok) {
8508                                                         /*
8509                                                          * use this data's
8510                                                          * keyid
8511                                                          */
8512                                                         auth_keyid = chk->auth_keyid;
8513                                                         override_ok = 0;
8514                                                 } else if (auth_keyid != chk->auth_keyid) {
8515                                                         /*
8516                                                          * different keyid,
8517                                                          * so done bundling
8518                                                          */
8519                                                         break;
8520                                                 }
8521                                         }
8522                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8523                                             chk->send_size, chk->copy_by_ref);
8524                                         if (outchain == NULL) {
8525                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8526                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8527                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8528                                                 }
8529                                                 *reason_code = 3;
8530                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8531                                                 return (ENOMEM);
8532                                         }
8533                                         /* upate our MTU size */
8534                                         /* Do clear IP_DF ? */
8535                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8536                                                 no_fragmentflg = 0;
8537                                         }
8538                                         /* unsigned subtraction of mtu */
8539                                         if (mtu > chk->send_size)
8540                                                 mtu -= chk->send_size;
8541                                         else
8542                                                 mtu = 0;
8543                                         /* unsigned subtraction of r_mtu */
8544                                         if (r_mtu > chk->send_size)
8545                                                 r_mtu -= chk->send_size;
8546                                         else
8547                                                 r_mtu = 0;
8548
8549                                         to_out += chk->send_size;
8550                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8551 #ifdef INVARIANTS
8552                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8553 #else
8554                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8555                                                     mx_mtu, to_out);
8556 #endif
8557                                         }
8558                                         chk->window_probe = 0;
8559                                         data_list[bundle_at++] = chk;
8560                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8561                                                 break;
8562                                         }
8563                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8564                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8565                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8566                                                 } else {
8567                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8568                                                 }
8569                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8570                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8571                                                         /*
8572                                                          * Count number of
8573                                                          * user msg's that
8574                                                          * were fragmented
8575                                                          * we do this by
8576                                                          * counting when we
8577                                                          * see a LAST
8578                                                          * fragment only.
8579                                                          */
8580                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8581                                         }
8582                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8583                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8584                                                         data_list[0]->window_probe = 1;
8585                                                         net->window_probe = 1;
8586                                                 }
8587                                                 break;
8588                                         }
8589                                 } else {
8590                                         /*
8591                                          * Must be sent in order of the
8592                                          * TSN's (on a network)
8593                                          */
8594                                         break;
8595                                 }
8596                         }       /* for (chunk gather loop for this net) */
8597                 }               /* if asoc.state OPEN */
8598 no_data_fill:
8599                 /* Is there something to send for this destination? */
8600                 if (outchain) {
8601                         /* We may need to start a control timer or two */
8602                         if (asconf) {
8603                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8604                                     stcb, net);
8605                                 /*
8606                                  * do NOT clear the asconf flag as it is
8607                                  * used to do appropriate source address
8608                                  * selection.
8609                                  */
8610                         }
8611                         if (cookie) {
8612                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8613                                 cookie = 0;
8614                         }
8615                         /* must start a send timer if data is being sent */
8616                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8617                                 /*
8618                                  * no timer running on this destination
8619                                  * restart it.
8620                                  */
8621                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8622                         }
8623                         /* Now send it, if there is anything to send :> */
8624                         if ((error = sctp_lowlevel_chunk_output(inp,
8625                             stcb,
8626                             net,
8627                             (struct sockaddr *)&net->ro._l_addr,
8628                             outchain,
8629                             auth_offset,
8630                             auth,
8631                             auth_keyid,
8632                             no_fragmentflg,
8633                             bundle_at,
8634                             asconf,
8635                             inp->sctp_lport, stcb->rport,
8636                             htonl(stcb->asoc.peer_vtag),
8637                             net->port, NULL,
8638                             0, 0,
8639                             so_locked))) {
8640                                 /* error, we could not output */
8641                                 if (error == ENOBUFS) {
8642                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8643                                         asoc->ifp_had_enobuf = 1;
8644                                 }
8645                                 if (from_where == 0) {
8646                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8647                                 }
8648                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8649                                 if (hbflag) {
8650                                         if (*now_filled == 0) {
8651                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8652                                                 *now_filled = 1;
8653                                                 *now = net->last_sent_time;
8654                                         } else {
8655                                                 net->last_sent_time = *now;
8656                                         }
8657                                         hbflag = 0;
8658                                 }
8659                                 if (error == EHOSTUNREACH) {
8660                                         /*
8661                                          * Destination went unreachable
8662                                          * during this send
8663                                          */
8664                                         sctp_move_chunks_from_net(stcb, net);
8665                                 }
8666                                 *reason_code = 6;
8667                                 /*-
8668                                  * I add this line to be paranoid. As far as
8669                                  * I can tell the continue, takes us back to
8670                                  * the top of the for, but just to make sure
8671                                  * I will reset these again here.
8672                                  */
8673                                 ctl_cnt = bundle_at = 0;
8674                                 continue;       /* This takes us back to the
8675                                                  * for() for the nets. */
8676                         } else {
8677                                 asoc->ifp_had_enobuf = 0;
8678                         }
8679                         endoutchain = NULL;
8680                         auth = NULL;
8681                         auth_offset = 0;
8682                         if (bundle_at || hbflag) {
8683                                 /* For data/asconf and hb set time */
8684                                 if (*now_filled == 0) {
8685                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8686                                         *now_filled = 1;
8687                                         *now = net->last_sent_time;
8688                                 } else {
8689                                         net->last_sent_time = *now;
8690                                 }
8691                         }
8692                         if (!no_out_cnt) {
8693                                 *num_out += (ctl_cnt + bundle_at);
8694                         }
8695                         if (bundle_at) {
8696                                 /* setup for a RTO measurement */
8697                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8698                                 /* fill time if not already filled */
8699                                 if (*now_filled == 0) {
8700                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8701                                         *now_filled = 1;
8702                                         *now = asoc->time_last_sent;
8703                                 } else {
8704                                         asoc->time_last_sent = *now;
8705                                 }
8706                                 if (net->rto_needed) {
8707                                         data_list[0]->do_rtt = 1;
8708                                         net->rto_needed = 0;
8709                                 }
8710                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8711                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8712                         }
8713                         if (one_chunk) {
8714                                 break;
8715                         }
8716                 }
8717                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8718                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8719                 }
8720         }
8721         if (old_start_at == NULL) {
8722                 old_start_at = start_at;
8723                 start_at = TAILQ_FIRST(&asoc->nets);
8724                 if (old_start_at)
8725                         goto again_one_more_time;
8726         }
8727         /*
8728          * At the end there should be no NON timed chunks hanging on this
8729          * queue.
8730          */
8731         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8732                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8733         }
8734         if ((*num_out == 0) && (*reason_code == 0)) {
8735                 *reason_code = 4;
8736         } else {
8737                 *reason_code = 5;
8738         }
8739         sctp_clean_up_ctl(stcb, asoc, so_locked);
8740         return (0);
8741 }
8742
8743 void
8744 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8745 {
8746         /*-
8747          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8748          * the control chunk queue.
8749          */
8750         struct sctp_chunkhdr *hdr;
8751         struct sctp_tmit_chunk *chk;
8752         struct mbuf *mat;
8753
8754         SCTP_TCB_LOCK_ASSERT(stcb);
8755         sctp_alloc_a_chunk(stcb, chk);
8756         if (chk == NULL) {
8757                 /* no memory */
8758                 sctp_m_freem(op_err);
8759                 return;
8760         }
8761         chk->copy_by_ref = 0;
8762         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8763         if (op_err == NULL) {
8764                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8765                 return;
8766         }
8767         chk->send_size = 0;
8768         mat = op_err;
8769         while (mat != NULL) {
8770                 chk->send_size += SCTP_BUF_LEN(mat);
8771                 mat = SCTP_BUF_NEXT(mat);
8772         }
8773         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8774         chk->rec.chunk_id.can_take_data = 1;
8775         chk->sent = SCTP_DATAGRAM_UNSENT;
8776         chk->snd_count = 0;
8777         chk->flags = 0;
8778         chk->asoc = &stcb->asoc;
8779         chk->data = op_err;
8780         chk->whoTo = NULL;
8781         hdr = mtod(op_err, struct sctp_chunkhdr *);
8782         hdr->chunk_type = SCTP_OPERATION_ERROR;
8783         hdr->chunk_flags = 0;
8784         hdr->chunk_length = htons(chk->send_size);
8785         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8786             chk,
8787             sctp_next);
8788         chk->asoc->ctrl_queue_cnt++;
8789 }
8790
8791 int
8792 sctp_send_cookie_echo(struct mbuf *m,
8793     int offset,
8794     struct sctp_tcb *stcb,
8795     struct sctp_nets *net)
8796 {
8797         /*-
8798          * pull out the cookie and put it at the front of the control chunk
8799          * queue.
8800          */
8801         int at;
8802         struct mbuf *cookie;
8803         struct sctp_paramhdr parm, *phdr;
8804         struct sctp_chunkhdr *hdr;
8805         struct sctp_tmit_chunk *chk;
8806         uint16_t ptype, plen;
8807
8808         /* First find the cookie in the param area */
8809         cookie = NULL;
8810         at = offset + sizeof(struct sctp_init_chunk);
8811
8812         SCTP_TCB_LOCK_ASSERT(stcb);
8813         do {
8814                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8815                 if (phdr == NULL) {
8816                         return (-3);
8817                 }
8818                 ptype = ntohs(phdr->param_type);
8819                 plen = ntohs(phdr->param_length);
8820                 if (ptype == SCTP_STATE_COOKIE) {
8821                         int pad;
8822
8823                         /* found the cookie */
8824                         if ((pad = (plen % 4))) {
8825                                 plen += 4 - pad;
8826                         }
8827                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8828                         if (cookie == NULL) {
8829                                 /* No memory */
8830                                 return (-2);
8831                         }
8832 #ifdef SCTP_MBUF_LOGGING
8833                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8834                                 struct mbuf *mat;
8835
8836                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8837                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8838                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8839                                         }
8840                                 }
8841                         }
8842 #endif
8843                         break;
8844                 }
8845                 at += SCTP_SIZE32(plen);
8846         } while (phdr);
8847         if (cookie == NULL) {
8848                 /* Did not find the cookie */
8849                 return (-3);
8850         }
8851         /* ok, we got the cookie lets change it into a cookie echo chunk */
8852
8853         /* first the change from param to cookie */
8854         hdr = mtod(cookie, struct sctp_chunkhdr *);
8855         hdr->chunk_type = SCTP_COOKIE_ECHO;
8856         hdr->chunk_flags = 0;
8857         /* get the chunk stuff now and place it in the FRONT of the queue */
8858         sctp_alloc_a_chunk(stcb, chk);
8859         if (chk == NULL) {
8860                 /* no memory */
8861                 sctp_m_freem(cookie);
8862                 return (-5);
8863         }
8864         chk->copy_by_ref = 0;
8865         chk->send_size = plen;
8866         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8867         chk->rec.chunk_id.can_take_data = 0;
8868         chk->sent = SCTP_DATAGRAM_UNSENT;
8869         chk->snd_count = 0;
8870         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8871         chk->asoc = &stcb->asoc;
8872         chk->data = cookie;
8873         chk->whoTo = net;
8874         atomic_add_int(&chk->whoTo->ref_count, 1);
8875         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8876         chk->asoc->ctrl_queue_cnt++;
8877         return (0);
8878 }
8879
8880 void
8881 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8882     struct mbuf *m,
8883     int offset,
8884     int chk_length,
8885     struct sctp_nets *net)
8886 {
8887         /*
8888          * take a HB request and make it into a HB ack and send it.
8889          */
8890         struct mbuf *outchain;
8891         struct sctp_chunkhdr *chdr;
8892         struct sctp_tmit_chunk *chk;
8893
8894
8895         if (net == NULL)
8896                 /* must have a net pointer */
8897                 return;
8898
8899         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8900         if (outchain == NULL) {
8901                 /* gak out of memory */
8902                 return;
8903         }
8904 #ifdef SCTP_MBUF_LOGGING
8905         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8906                 struct mbuf *mat;
8907
8908                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
8909                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8910                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8911                         }
8912                 }
8913         }
8914 #endif
8915         chdr = mtod(outchain, struct sctp_chunkhdr *);
8916         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8917         chdr->chunk_flags = 0;
8918         if (chk_length % 4) {
8919                 /* need pad */
8920                 uint32_t cpthis = 0;
8921                 int padlen;
8922
8923                 padlen = 4 - (chk_length % 4);
8924                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8925         }
8926         sctp_alloc_a_chunk(stcb, chk);
8927         if (chk == NULL) {
8928                 /* no memory */
8929                 sctp_m_freem(outchain);
8930                 return;
8931         }
8932         chk->copy_by_ref = 0;
8933         chk->send_size = chk_length;
8934         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8935         chk->rec.chunk_id.can_take_data = 1;
8936         chk->sent = SCTP_DATAGRAM_UNSENT;
8937         chk->snd_count = 0;
8938         chk->flags = 0;
8939         chk->asoc = &stcb->asoc;
8940         chk->data = outchain;
8941         chk->whoTo = net;
8942         atomic_add_int(&chk->whoTo->ref_count, 1);
8943         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8944         chk->asoc->ctrl_queue_cnt++;
8945 }
8946
8947 void
8948 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8949 {
8950         /* formulate and queue a cookie-ack back to sender */
8951         struct mbuf *cookie_ack;
8952         struct sctp_chunkhdr *hdr;
8953         struct sctp_tmit_chunk *chk;
8954
8955         cookie_ack = NULL;
8956         SCTP_TCB_LOCK_ASSERT(stcb);
8957
8958         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8959         if (cookie_ack == NULL) {
8960                 /* no mbuf's */
8961                 return;
8962         }
8963         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8964         sctp_alloc_a_chunk(stcb, chk);
8965         if (chk == NULL) {
8966                 /* no memory */
8967                 sctp_m_freem(cookie_ack);
8968                 return;
8969         }
8970         chk->copy_by_ref = 0;
8971         chk->send_size = sizeof(struct sctp_chunkhdr);
8972         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8973         chk->rec.chunk_id.can_take_data = 1;
8974         chk->sent = SCTP_DATAGRAM_UNSENT;
8975         chk->snd_count = 0;
8976         chk->flags = 0;
8977         chk->asoc = &stcb->asoc;
8978         chk->data = cookie_ack;
8979         if (chk->asoc->last_control_chunk_from != NULL) {
8980                 chk->whoTo = chk->asoc->last_control_chunk_from;
8981                 atomic_add_int(&chk->whoTo->ref_count, 1);
8982         } else {
8983                 chk->whoTo = NULL;
8984         }
8985         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8986         hdr->chunk_type = SCTP_COOKIE_ACK;
8987         hdr->chunk_flags = 0;
8988         hdr->chunk_length = htons(chk->send_size);
8989         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8990         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8991         chk->asoc->ctrl_queue_cnt++;
8992         return;
8993 }
8994
8995
8996 void
8997 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
8998 {
8999         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9000         struct mbuf *m_shutdown_ack;
9001         struct sctp_shutdown_ack_chunk *ack_cp;
9002         struct sctp_tmit_chunk *chk;
9003
9004         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9005         if (m_shutdown_ack == NULL) {
9006                 /* no mbuf's */
9007                 return;
9008         }
9009         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9010         sctp_alloc_a_chunk(stcb, chk);
9011         if (chk == NULL) {
9012                 /* no memory */
9013                 sctp_m_freem(m_shutdown_ack);
9014                 return;
9015         }
9016         chk->copy_by_ref = 0;
9017         chk->send_size = sizeof(struct sctp_chunkhdr);
9018         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9019         chk->rec.chunk_id.can_take_data = 1;
9020         chk->sent = SCTP_DATAGRAM_UNSENT;
9021         chk->snd_count = 0;
9022         chk->flags = 0;
9023         chk->asoc = &stcb->asoc;
9024         chk->data = m_shutdown_ack;
9025         chk->whoTo = net;
9026         if (chk->whoTo) {
9027                 atomic_add_int(&chk->whoTo->ref_count, 1);
9028         }
9029         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9030         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9031         ack_cp->ch.chunk_flags = 0;
9032         ack_cp->ch.chunk_length = htons(chk->send_size);
9033         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9034         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9035         chk->asoc->ctrl_queue_cnt++;
9036         return;
9037 }
9038
9039 void
9040 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9041 {
9042         /* formulate and queue a SHUTDOWN to the sender */
9043         struct mbuf *m_shutdown;
9044         struct sctp_shutdown_chunk *shutdown_cp;
9045         struct sctp_tmit_chunk *chk;
9046
9047         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9048         if (m_shutdown == NULL) {
9049                 /* no mbuf's */
9050                 return;
9051         }
9052         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9053         sctp_alloc_a_chunk(stcb, chk);
9054         if (chk == NULL) {
9055                 /* no memory */
9056                 sctp_m_freem(m_shutdown);
9057                 return;
9058         }
9059         chk->copy_by_ref = 0;
9060         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9061         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9062         chk->rec.chunk_id.can_take_data = 1;
9063         chk->sent = SCTP_DATAGRAM_UNSENT;
9064         chk->snd_count = 0;
9065         chk->flags = 0;
9066         chk->asoc = &stcb->asoc;
9067         chk->data = m_shutdown;
9068         chk->whoTo = net;
9069         if (chk->whoTo) {
9070                 atomic_add_int(&chk->whoTo->ref_count, 1);
9071         }
9072         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9073         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9074         shutdown_cp->ch.chunk_flags = 0;
9075         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9076         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9077         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9078         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9079         chk->asoc->ctrl_queue_cnt++;
9080         return;
9081 }
9082
9083 void
9084 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9085 {
9086         /*
9087          * formulate and queue an ASCONF to the peer. ASCONF parameters
9088          * should be queued on the assoc queue.
9089          */
9090         struct sctp_tmit_chunk *chk;
9091         struct mbuf *m_asconf;
9092         int len;
9093
9094         SCTP_TCB_LOCK_ASSERT(stcb);
9095
9096         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9097             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9098                 /* can't send a new one if there is one in flight already */
9099                 return;
9100         }
9101         /* compose an ASCONF chunk, maximum length is PMTU */
9102         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9103         if (m_asconf == NULL) {
9104                 return;
9105         }
9106         sctp_alloc_a_chunk(stcb, chk);
9107         if (chk == NULL) {
9108                 /* no memory */
9109                 sctp_m_freem(m_asconf);
9110                 return;
9111         }
9112         chk->copy_by_ref = 0;
9113         chk->data = m_asconf;
9114         chk->send_size = len;
9115         chk->rec.chunk_id.id = SCTP_ASCONF;
9116         chk->rec.chunk_id.can_take_data = 0;
9117         chk->sent = SCTP_DATAGRAM_UNSENT;
9118         chk->snd_count = 0;
9119         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9120         chk->asoc = &stcb->asoc;
9121         chk->whoTo = net;
9122         if (chk->whoTo) {
9123                 atomic_add_int(&chk->whoTo->ref_count, 1);
9124         }
9125         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9126         chk->asoc->ctrl_queue_cnt++;
9127         return;
9128 }
9129
9130 void
9131 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9132 {
9133         /*
9134          * formulate and queue a asconf-ack back to sender. the asconf-ack
9135          * must be stored in the tcb.
9136          */
9137         struct sctp_tmit_chunk *chk;
9138         struct sctp_asconf_ack *ack, *latest_ack;
9139         struct mbuf *m_ack;
9140         struct sctp_nets *net = NULL;
9141
9142         SCTP_TCB_LOCK_ASSERT(stcb);
9143         /* Get the latest ASCONF-ACK */
9144         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9145         if (latest_ack == NULL) {
9146                 return;
9147         }
9148         if (latest_ack->last_sent_to != NULL &&
9149             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9150                 /* we're doing a retransmission */
9151                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9152                 if (net == NULL) {
9153                         /* no alternate */
9154                         if (stcb->asoc.last_control_chunk_from == NULL) {
9155                                 if (stcb->asoc.alternate) {
9156                                         net = stcb->asoc.alternate;
9157                                 } else {
9158                                         net = stcb->asoc.primary_destination;
9159                                 }
9160                         } else {
9161                                 net = stcb->asoc.last_control_chunk_from;
9162                         }
9163                 }
9164         } else {
9165                 /* normal case */
9166                 if (stcb->asoc.last_control_chunk_from == NULL) {
9167                         if (stcb->asoc.alternate) {
9168                                 net = stcb->asoc.alternate;
9169                         } else {
9170                                 net = stcb->asoc.primary_destination;
9171                         }
9172                 } else {
9173                         net = stcb->asoc.last_control_chunk_from;
9174                 }
9175         }
9176         latest_ack->last_sent_to = net;
9177
9178         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9179                 if (ack->data == NULL) {
9180                         continue;
9181                 }
9182                 /* copy the asconf_ack */
9183                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9184                 if (m_ack == NULL) {
9185                         /* couldn't copy it */
9186                         return;
9187                 }
9188 #ifdef SCTP_MBUF_LOGGING
9189                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9190                         struct mbuf *mat;
9191
9192                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9193                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9194                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9195                                 }
9196                         }
9197                 }
9198 #endif
9199
9200                 sctp_alloc_a_chunk(stcb, chk);
9201                 if (chk == NULL) {
9202                         /* no memory */
9203                         if (m_ack)
9204                                 sctp_m_freem(m_ack);
9205                         return;
9206                 }
9207                 chk->copy_by_ref = 0;
9208
9209                 chk->whoTo = net;
9210                 if (chk->whoTo) {
9211                         atomic_add_int(&chk->whoTo->ref_count, 1);
9212                 }
9213                 chk->data = m_ack;
9214                 chk->send_size = 0;
9215                 /* Get size */
9216                 chk->send_size = ack->len;
9217                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9218                 chk->rec.chunk_id.can_take_data = 1;
9219                 chk->sent = SCTP_DATAGRAM_UNSENT;
9220                 chk->snd_count = 0;
9221                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9222                 chk->asoc = &stcb->asoc;
9223
9224                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9225                 chk->asoc->ctrl_queue_cnt++;
9226         }
9227         return;
9228 }
9229
9230
9231 static int
9232 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9233     struct sctp_tcb *stcb,
9234     struct sctp_association *asoc,
9235     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9236 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9237     SCTP_UNUSED
9238 #endif
9239 )
9240 {
9241         /*-
9242          * send out one MTU of retransmission. If fast_retransmit is
9243          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9244          * rwnd. For a Cookie or Asconf in the control chunk queue we
9245          * retransmit them by themselves.
9246          *
9247          * For data chunks we will pick out the lowest TSN's in the sent_queue
9248          * marked for resend and bundle them all together (up to a MTU of
9249          * destination). The address to send to should have been
9250          * selected/changed where the retransmission was marked (i.e. in FR
9251          * or t3-timeout routines).
9252          */
9253         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9254         struct sctp_tmit_chunk *chk, *fwd;
9255         struct mbuf *m, *endofchain;
9256         struct sctp_nets *net = NULL;
9257         uint32_t tsns_sent = 0;
9258         int no_fragmentflg, bundle_at, cnt_thru;
9259         unsigned int mtu;
9260         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9261         struct sctp_auth_chunk *auth = NULL;
9262         uint32_t auth_offset = 0;
9263         uint16_t auth_keyid;
9264         int override_ok = 1;
9265         int data_auth_reqd = 0;
9266         uint32_t dmtu = 0;
9267
9268         SCTP_TCB_LOCK_ASSERT(stcb);
9269         tmr_started = ctl_cnt = bundle_at = error = 0;
9270         no_fragmentflg = 1;
9271         fwd_tsn = 0;
9272         *cnt_out = 0;
9273         fwd = NULL;
9274         endofchain = m = NULL;
9275         auth_keyid = stcb->asoc.authinfo.active_keyid;
9276 #ifdef SCTP_AUDITING_ENABLED
9277         sctp_audit_log(0xC3, 1);
9278 #endif
9279         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9280             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9281                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9282                     asoc->sent_queue_retran_cnt);
9283                 asoc->sent_queue_cnt = 0;
9284                 asoc->sent_queue_cnt_removeable = 0;
9285                 /* send back 0/0 so we enter normal transmission */
9286                 *cnt_out = 0;
9287                 return (0);
9288         }
9289         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9290                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9291                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9292                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9293                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9294                                 continue;
9295                         }
9296                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9297                                 if (chk != asoc->str_reset) {
9298                                         /*
9299                                          * not eligible for retran if its
9300                                          * not ours
9301                                          */
9302                                         continue;
9303                                 }
9304                         }
9305                         ctl_cnt++;
9306                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9307                                 fwd_tsn = 1;
9308                         }
9309                         /*
9310                          * Add an AUTH chunk, if chunk requires it save the
9311                          * offset into the chain for AUTH
9312                          */
9313                         if ((auth == NULL) &&
9314                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9315                             stcb->asoc.peer_auth_chunks))) {
9316                                 m = sctp_add_auth_chunk(m, &endofchain,
9317                                     &auth, &auth_offset,
9318                                     stcb,
9319                                     chk->rec.chunk_id.id);
9320                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9321                         }
9322                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9323                         break;
9324                 }
9325         }
9326         one_chunk = 0;
9327         cnt_thru = 0;
9328         /* do we have control chunks to retransmit? */
9329         if (m != NULL) {
9330                 /* Start a timer no matter if we suceed or fail */
9331                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9332                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9333                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9334                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9335                 chk->snd_count++;       /* update our count */
9336                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9337                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9338                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9339                     no_fragmentflg, 0, 0,
9340                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9341                     chk->whoTo->port, NULL,
9342                     0, 0,
9343                     so_locked))) {
9344                         SCTP_STAT_INCR(sctps_lowlevelerr);
9345                         return (error);
9346                 }
9347                 endofchain = NULL;
9348                 auth = NULL;
9349                 auth_offset = 0;
9350                 /*
9351                  * We don't want to mark the net->sent time here since this
9352                  * we use this for HB and retrans cannot measure RTT
9353                  */
9354                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9355                 *cnt_out += 1;
9356                 chk->sent = SCTP_DATAGRAM_SENT;
9357                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9358                 if (fwd_tsn == 0) {
9359                         return (0);
9360                 } else {
9361                         /* Clean up the fwd-tsn list */
9362                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9363                         return (0);
9364                 }
9365         }
9366         /*
9367          * Ok, it is just data retransmission we need to do or that and a
9368          * fwd-tsn with it all.
9369          */
9370         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9371                 return (SCTP_RETRAN_DONE);
9372         }
9373         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9374             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9375                 /* not yet open, resend the cookie and that is it */
9376                 return (1);
9377         }
9378 #ifdef SCTP_AUDITING_ENABLED
9379         sctp_auditing(20, inp, stcb, NULL);
9380 #endif
9381         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9382         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9383                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9384                         /* No, not sent to this net or not ready for rtx */
9385                         continue;
9386                 }
9387                 if (chk->data == NULL) {
9388                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9389                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9390                         continue;
9391                 }
9392                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9393                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9394                         /* Gak, we have exceeded max unlucky retran, abort! */
9395                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9396                             chk->snd_count,
9397                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9398                         atomic_add_int(&stcb->asoc.refcnt, 1);
9399                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9400                         SCTP_TCB_LOCK(stcb);
9401                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9402                         return (SCTP_RETRAN_EXIT);
9403                 }
9404                 /* pick up the net */
9405                 net = chk->whoTo;
9406                 switch (net->ro._l_addr.sa.sa_family) {
9407 #ifdef INET
9408                 case AF_INET:
9409                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9410                         break;
9411 #endif
9412 #ifdef INET6
9413                 case AF_INET6:
9414                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9415                         break;
9416 #endif
9417                 default:
9418                         /* TSNH */
9419                         mtu = net->mtu;
9420                         break;
9421                 }
9422
9423                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9424                         /* No room in peers rwnd */
9425                         uint32_t tsn;
9426
9427                         tsn = asoc->last_acked_seq + 1;
9428                         if (tsn == chk->rec.data.TSN_seq) {
9429                                 /*
9430                                  * we make a special exception for this
9431                                  * case. The peer has no rwnd but is missing
9432                                  * the lowest chunk.. which is probably what
9433                                  * is holding up the rwnd.
9434                                  */
9435                                 goto one_chunk_around;
9436                         }
9437                         return (1);
9438                 }
9439 one_chunk_around:
9440                 if (asoc->peers_rwnd < mtu) {
9441                         one_chunk = 1;
9442                         if ((asoc->peers_rwnd == 0) &&
9443                             (asoc->total_flight == 0)) {
9444                                 chk->window_probe = 1;
9445                                 chk->whoTo->window_probe = 1;
9446                         }
9447                 }
9448 #ifdef SCTP_AUDITING_ENABLED
9449                 sctp_audit_log(0xC3, 2);
9450 #endif
9451                 bundle_at = 0;
9452                 m = NULL;
9453                 net->fast_retran_ip = 0;
9454                 if (chk->rec.data.doing_fast_retransmit == 0) {
9455                         /*
9456                          * if no FR in progress skip destination that have
9457                          * flight_size > cwnd.
9458                          */
9459                         if (net->flight_size >= net->cwnd) {
9460                                 continue;
9461                         }
9462                 } else {
9463                         /*
9464                          * Mark the destination net to have FR recovery
9465                          * limits put on it.
9466                          */
9467                         *fr_done = 1;
9468                         net->fast_retran_ip = 1;
9469                 }
9470
9471                 /*
9472                  * if no AUTH is yet included and this chunk requires it,
9473                  * make sure to account for it.  We don't apply the size
9474                  * until the AUTH chunk is actually added below in case
9475                  * there is no room for this chunk.
9476                  */
9477                 if (data_auth_reqd && (auth == NULL)) {
9478                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9479                 } else
9480                         dmtu = 0;
9481
9482                 if ((chk->send_size <= (mtu - dmtu)) ||
9483                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9484                         /* ok we will add this one */
9485                         if (data_auth_reqd) {
9486                                 if (auth == NULL) {
9487                                         m = sctp_add_auth_chunk(m,
9488                                             &endofchain,
9489                                             &auth,
9490                                             &auth_offset,
9491                                             stcb,
9492                                             SCTP_DATA);
9493                                         auth_keyid = chk->auth_keyid;
9494                                         override_ok = 0;
9495                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9496                                 } else if (override_ok) {
9497                                         auth_keyid = chk->auth_keyid;
9498                                         override_ok = 0;
9499                                 } else if (chk->auth_keyid != auth_keyid) {
9500                                         /* different keyid, so done bundling */
9501                                         break;
9502                                 }
9503                         }
9504                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9505                         if (m == NULL) {
9506                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9507                                 return (ENOMEM);
9508                         }
9509                         /* Do clear IP_DF ? */
9510                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9511                                 no_fragmentflg = 0;
9512                         }
9513                         /* upate our MTU size */
9514                         if (mtu > (chk->send_size + dmtu))
9515                                 mtu -= (chk->send_size + dmtu);
9516                         else
9517                                 mtu = 0;
9518                         data_list[bundle_at++] = chk;
9519                         if (one_chunk && (asoc->total_flight <= 0)) {
9520                                 SCTP_STAT_INCR(sctps_windowprobed);
9521                         }
9522                 }
9523                 if (one_chunk == 0) {
9524                         /*
9525                          * now are there anymore forward from chk to pick
9526                          * up?
9527                          */
9528                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9529                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9530                                         /* Nope, not for retran */
9531                                         continue;
9532                                 }
9533                                 if (fwd->whoTo != net) {
9534                                         /* Nope, not the net in question */
9535                                         continue;
9536                                 }
9537                                 if (data_auth_reqd && (auth == NULL)) {
9538                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9539                                 } else
9540                                         dmtu = 0;
9541                                 if (fwd->send_size <= (mtu - dmtu)) {
9542                                         if (data_auth_reqd) {
9543                                                 if (auth == NULL) {
9544                                                         m = sctp_add_auth_chunk(m,
9545                                                             &endofchain,
9546                                                             &auth,
9547                                                             &auth_offset,
9548                                                             stcb,
9549                                                             SCTP_DATA);
9550                                                         auth_keyid = fwd->auth_keyid;
9551                                                         override_ok = 0;
9552                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9553                                                 } else if (override_ok) {
9554                                                         auth_keyid = fwd->auth_keyid;
9555                                                         override_ok = 0;
9556                                                 } else if (fwd->auth_keyid != auth_keyid) {
9557                                                         /*
9558                                                          * different keyid,
9559                                                          * so done bundling
9560                                                          */
9561                                                         break;
9562                                                 }
9563                                         }
9564                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9565                                         if (m == NULL) {
9566                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9567                                                 return (ENOMEM);
9568                                         }
9569                                         /* Do clear IP_DF ? */
9570                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9571                                                 no_fragmentflg = 0;
9572                                         }
9573                                         /* upate our MTU size */
9574                                         if (mtu > (fwd->send_size + dmtu))
9575                                                 mtu -= (fwd->send_size + dmtu);
9576                                         else
9577                                                 mtu = 0;
9578                                         data_list[bundle_at++] = fwd;
9579                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9580                                                 break;
9581                                         }
9582                                 } else {
9583                                         /* can't fit so we are done */
9584                                         break;
9585                                 }
9586                         }
9587                 }
9588                 /* Is there something to send for this destination? */
9589                 if (m) {
9590                         /*
9591                          * No matter if we fail/or suceed we should start a
9592                          * timer. A failure is like a lost IP packet :-)
9593                          */
9594                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9595                                 /*
9596                                  * no timer running on this destination
9597                                  * restart it.
9598                                  */
9599                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9600                                 tmr_started = 1;
9601                         }
9602                         /* Now lets send it, if there is anything to send :> */
9603                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9604                             (struct sockaddr *)&net->ro._l_addr, m,
9605                             auth_offset, auth, auth_keyid,
9606                             no_fragmentflg, 0, 0,
9607                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9608                             net->port, NULL,
9609                             0, 0,
9610                             so_locked))) {
9611                                 /* error, we could not output */
9612                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9613                                 return (error);
9614                         }
9615                         endofchain = NULL;
9616                         auth = NULL;
9617                         auth_offset = 0;
9618                         /* For HB's */
9619                         /*
9620                          * We don't want to mark the net->sent time here
9621                          * since this we use this for HB and retrans cannot
9622                          * measure RTT
9623                          */
9624                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9625
9626                         /* For auto-close */
9627                         cnt_thru++;
9628                         if (*now_filled == 0) {
9629                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9630                                 *now = asoc->time_last_sent;
9631                                 *now_filled = 1;
9632                         } else {
9633                                 asoc->time_last_sent = *now;
9634                         }
9635                         *cnt_out += bundle_at;
9636 #ifdef SCTP_AUDITING_ENABLED
9637                         sctp_audit_log(0xC4, bundle_at);
9638 #endif
9639                         if (bundle_at) {
9640                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9641                         }
9642                         for (i = 0; i < bundle_at; i++) {
9643                                 SCTP_STAT_INCR(sctps_sendretransdata);
9644                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9645                                 /*
9646                                  * When we have a revoked data, and we
9647                                  * retransmit it, then we clear the revoked
9648                                  * flag since this flag dictates if we
9649                                  * subtracted from the fs
9650                                  */
9651                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9652                                         /* Deflate the cwnd */
9653                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9654                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9655                                 }
9656                                 data_list[i]->snd_count++;
9657                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9658                                 /* record the time */
9659                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9660                                 if (data_list[i]->book_size_scale) {
9661                                         /*
9662                                          * need to double the book size on
9663                                          * this one
9664                                          */
9665                                         data_list[i]->book_size_scale = 0;
9666                                         /*
9667                                          * Since we double the booksize, we
9668                                          * must also double the output queue
9669                                          * size, since this get shrunk when
9670                                          * we free by this amount.
9671                                          */
9672                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9673                                         data_list[i]->book_size *= 2;
9674
9675
9676                                 } else {
9677                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9678                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9679                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9680                                         }
9681                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9682                                             (uint32_t) (data_list[i]->send_size +
9683                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9684                                 }
9685                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9686                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9687                                             data_list[i]->whoTo->flight_size,
9688                                             data_list[i]->book_size,
9689                                             (uintptr_t) data_list[i]->whoTo,
9690                                             data_list[i]->rec.data.TSN_seq);
9691                                 }
9692                                 sctp_flight_size_increase(data_list[i]);
9693                                 sctp_total_flight_increase(stcb, data_list[i]);
9694                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9695                                         /* SWS sender side engages */
9696                                         asoc->peers_rwnd = 0;
9697                                 }
9698                                 if ((i == 0) &&
9699                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9700                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9701                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9702                                             (tmr_started == 0)) {
9703                                                 /*-
9704                                                  * ok we just fast-retrans'd
9705                                                  * the lowest TSN, i.e the
9706                                                  * first on the list. In
9707                                                  * this case we want to give
9708                                                  * some more time to get a
9709                                                  * SACK back without a
9710                                                  * t3-expiring.
9711                                                  */
9712                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9713                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9714                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9715                                         }
9716                                 }
9717                         }
9718                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9719                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9720                         }
9721 #ifdef SCTP_AUDITING_ENABLED
9722                         sctp_auditing(21, inp, stcb, NULL);
9723 #endif
9724                 } else {
9725                         /* None will fit */
9726                         return (1);
9727                 }
9728                 if (asoc->sent_queue_retran_cnt <= 0) {
9729                         /* all done we have no more to retran */
9730                         asoc->sent_queue_retran_cnt = 0;
9731                         break;
9732                 }
9733                 if (one_chunk) {
9734                         /* No more room in rwnd */
9735                         return (1);
9736                 }
9737                 /* stop the for loop here. we sent out a packet */
9738                 break;
9739         }
9740         return (0);
9741 }
9742
9743 static void
9744 sctp_timer_validation(struct sctp_inpcb *inp,
9745     struct sctp_tcb *stcb,
9746     struct sctp_association *asoc)
9747 {
9748         struct sctp_nets *net;
9749
9750         /* Validate that a timer is running somewhere */
9751         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9752                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9753                         /* Here is a timer */
9754                         return;
9755                 }
9756         }
9757         SCTP_TCB_LOCK_ASSERT(stcb);
9758         /* Gak, we did not have a timer somewhere */
9759         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9760         if (asoc->alternate) {
9761                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9762         } else {
9763                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9764         }
9765         return;
9766 }
9767
9768 void
9769 sctp_chunk_output(struct sctp_inpcb *inp,
9770     struct sctp_tcb *stcb,
9771     int from_where,
9772     int so_locked
9773 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9774     SCTP_UNUSED
9775 #endif
9776 )
9777 {
9778         /*-
9779          * Ok this is the generic chunk service queue. we must do the
9780          * following:
9781          * - See if there are retransmits pending, if so we must
9782          *   do these first.
9783          * - Service the stream queue that is next, moving any
9784          *   message (note I must get a complete message i.e.
9785          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9786          *   TSN's
9787          * - Check to see if the cwnd/rwnd allows any output, if so we
9788          *   go ahead and fomulate and send the low level chunks. Making sure
9789          *   to combine any control in the control chunk queue also.
9790          */
9791         struct sctp_association *asoc;
9792         struct sctp_nets *net;
9793         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9794         unsigned int burst_cnt = 0;
9795         struct timeval now;
9796         int now_filled = 0;
9797         int nagle_on;
9798         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9799         int un_sent = 0;
9800         int fr_done;
9801         unsigned int tot_frs = 0;
9802
9803         asoc = &stcb->asoc;
9804         /* The Nagle algorithm is only applied when handling a send call. */
9805         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9806                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9807                         nagle_on = 0;
9808                 } else {
9809                         nagle_on = 1;
9810                 }
9811         } else {
9812                 nagle_on = 0;
9813         }
9814         SCTP_TCB_LOCK_ASSERT(stcb);
9815
9816         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9817
9818         if ((un_sent <= 0) &&
9819             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9820             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9821             (asoc->sent_queue_retran_cnt == 0)) {
9822                 /* Nothing to do unless there is something to be sent left */
9823                 return;
9824         }
9825         /*
9826          * Do we have something to send, data or control AND a sack timer
9827          * running, if so piggy-back the sack.
9828          */
9829         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9830                 sctp_send_sack(stcb, so_locked);
9831                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9832         }
9833         while (asoc->sent_queue_retran_cnt) {
9834                 /*-
9835                  * Ok, it is retransmission time only, we send out only ONE
9836                  * packet with a single call off to the retran code.
9837                  */
9838                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9839                         /*-
9840                          * Special hook for handling cookiess discarded
9841                          * by peer that carried data. Send cookie-ack only
9842                          * and then the next call with get the retran's.
9843                          */
9844                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9845                             from_where,
9846                             &now, &now_filled, frag_point, so_locked);
9847                         return;
9848                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9849                         /* if its not from a HB then do it */
9850                         fr_done = 0;
9851                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9852                         if (fr_done) {
9853                                 tot_frs++;
9854                         }
9855                 } else {
9856                         /*
9857                          * its from any other place, we don't allow retran
9858                          * output (only control)
9859                          */
9860                         ret = 1;
9861                 }
9862                 if (ret > 0) {
9863                         /* Can't send anymore */
9864                         /*-
9865                          * now lets push out control by calling med-level
9866                          * output once. this assures that we WILL send HB's
9867                          * if queued too.
9868                          */
9869                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9870                             from_where,
9871                             &now, &now_filled, frag_point, so_locked);
9872 #ifdef SCTP_AUDITING_ENABLED
9873                         sctp_auditing(8, inp, stcb, NULL);
9874 #endif
9875                         sctp_timer_validation(inp, stcb, asoc);
9876                         return;
9877                 }
9878                 if (ret < 0) {
9879                         /*-
9880                          * The count was off.. retran is not happening so do
9881                          * the normal retransmission.
9882                          */
9883 #ifdef SCTP_AUDITING_ENABLED
9884                         sctp_auditing(9, inp, stcb, NULL);
9885 #endif
9886                         if (ret == SCTP_RETRAN_EXIT) {
9887                                 return;
9888                         }
9889                         break;
9890                 }
9891                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9892                         /* Only one transmission allowed out of a timeout */
9893 #ifdef SCTP_AUDITING_ENABLED
9894                         sctp_auditing(10, inp, stcb, NULL);
9895 #endif
9896                         /* Push out any control */
9897                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9898                             &now, &now_filled, frag_point, so_locked);
9899                         return;
9900                 }
9901                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9902                         /* Hit FR burst limit */
9903                         return;
9904                 }
9905                 if ((num_out == 0) && (ret == 0)) {
9906                         /* No more retrans to send */
9907                         break;
9908                 }
9909         }
9910 #ifdef SCTP_AUDITING_ENABLED
9911         sctp_auditing(12, inp, stcb, NULL);
9912 #endif
9913         /* Check for bad destinations, if they exist move chunks around. */
9914         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9915                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9916                         /*-
9917                          * if possible move things off of this address we
9918                          * still may send below due to the dormant state but
9919                          * we try to find an alternate address to send to
9920                          * and if we have one we move all queued data on the
9921                          * out wheel to this alternate address.
9922                          */
9923                         if (net->ref_count > 1)
9924                                 sctp_move_chunks_from_net(stcb, net);
9925                 } else {
9926                         /*-
9927                          * if ((asoc->sat_network) || (net->addr_is_local))
9928                          * { burst_limit = asoc->max_burst *
9929                          * SCTP_SAT_NETWORK_BURST_INCR; }
9930                          */
9931                         if (asoc->max_burst > 0) {
9932                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9933                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9934                                                 /*
9935                                                  * JRS - Use the congestion
9936                                                  * control given in the
9937                                                  * congestion control module
9938                                                  */
9939                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9940                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9941                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9942                                                 }
9943                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9944                                         }
9945                                         net->fast_retran_ip = 0;
9946                                 } else {
9947                                         if (net->flight_size == 0) {
9948                                                 /*
9949                                                  * Should be decaying the
9950                                                  * cwnd here
9951                                                  */
9952                                                 ;
9953                                         }
9954                                 }
9955                         }
9956                 }
9957
9958         }
9959         burst_cnt = 0;
9960         do {
9961                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9962                     &reason_code, 0, from_where,
9963                     &now, &now_filled, frag_point, so_locked);
9964                 if (error) {
9965                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9966                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9967                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9968                         }
9969                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9970                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9971                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9972                         }
9973                         break;
9974                 }
9975                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9976
9977                 tot_out += num_out;
9978                 burst_cnt++;
9979                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9980                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9981                         if (num_out == 0) {
9982                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9983                         }
9984                 }
9985                 if (nagle_on) {
9986                         /*
9987                          * When the Nagle algorithm is used, look at how
9988                          * much is unsent, then if its smaller than an MTU
9989                          * and we have data in flight we stop, except if we
9990                          * are handling a fragmented user message.
9991                          */
9992                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
9993                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
9994                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
9995                             (stcb->asoc.total_flight > 0) &&
9996                             ((stcb->asoc.locked_on_sending == NULL) ||
9997                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
9998                                 break;
9999                         }
10000                 }
10001                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10002                     TAILQ_EMPTY(&asoc->send_queue) &&
10003                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10004                         /* Nothing left to send */
10005                         break;
10006                 }
10007                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10008                         /* Nothing left to send */
10009                         break;
10010                 }
10011         } while (num_out &&
10012             ((asoc->max_burst == 0) ||
10013             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10014             (burst_cnt < asoc->max_burst)));
10015
10016         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10017                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10018                         SCTP_STAT_INCR(sctps_maxburstqueued);
10019                         asoc->burst_limit_applied = 1;
10020                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10021                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10022                         }
10023                 } else {
10024                         asoc->burst_limit_applied = 0;
10025                 }
10026         }
10027         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10028                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10029         }
10030         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10031             tot_out);
10032
10033         /*-
10034          * Now we need to clean up the control chunk chain if a ECNE is on
10035          * it. It must be marked as UNSENT again so next call will continue
10036          * to send it until such time that we get a CWR, to remove it.
10037          */
10038         if (stcb->asoc.ecn_echo_cnt_onq)
10039                 sctp_fix_ecn_echo(asoc);
10040         return;
10041 }
10042
10043
10044 int
10045 sctp_output(
10046     struct sctp_inpcb *inp,
10047     struct mbuf *m,
10048     struct sockaddr *addr,
10049     struct mbuf *control,
10050     struct thread *p,
10051     int flags)
10052 {
10053         if (inp == NULL) {
10054                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10055                 return (EINVAL);
10056         }
10057         if (inp->sctp_socket == NULL) {
10058                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10059                 return (EINVAL);
10060         }
10061         return (sctp_sosend(inp->sctp_socket,
10062             addr,
10063             (struct uio *)NULL,
10064             m,
10065             control,
10066             flags, p
10067             ));
10068 }
10069
10070 void
10071 send_forward_tsn(struct sctp_tcb *stcb,
10072     struct sctp_association *asoc)
10073 {
10074         struct sctp_tmit_chunk *chk;
10075         struct sctp_forward_tsn_chunk *fwdtsn;
10076         uint32_t advance_peer_ack_point;
10077
10078         SCTP_TCB_LOCK_ASSERT(stcb);
10079         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10080                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10081                         /* mark it to unsent */
10082                         chk->sent = SCTP_DATAGRAM_UNSENT;
10083                         chk->snd_count = 0;
10084                         /* Do we correct its output location? */
10085                         if (chk->whoTo) {
10086                                 sctp_free_remote_addr(chk->whoTo);
10087                                 chk->whoTo = NULL;
10088                         }
10089                         goto sctp_fill_in_rest;
10090                 }
10091         }
10092         /* Ok if we reach here we must build one */
10093         sctp_alloc_a_chunk(stcb, chk);
10094         if (chk == NULL) {
10095                 return;
10096         }
10097         asoc->fwd_tsn_cnt++;
10098         chk->copy_by_ref = 0;
10099         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10100         chk->rec.chunk_id.can_take_data = 0;
10101         chk->asoc = asoc;
10102         chk->whoTo = NULL;
10103         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10104         if (chk->data == NULL) {
10105                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10106                 return;
10107         }
10108         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10109         chk->sent = SCTP_DATAGRAM_UNSENT;
10110         chk->snd_count = 0;
10111         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10112         asoc->ctrl_queue_cnt++;
10113 sctp_fill_in_rest:
10114         /*-
10115          * Here we go through and fill out the part that deals with
10116          * stream/seq of the ones we skip.
10117          */
10118         SCTP_BUF_LEN(chk->data) = 0;
10119         {
10120                 struct sctp_tmit_chunk *at, *tp1, *last;
10121                 struct sctp_strseq *strseq;
10122                 unsigned int cnt_of_space, i, ovh;
10123                 unsigned int space_needed;
10124                 unsigned int cnt_of_skipped = 0;
10125
10126                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10127                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10128                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10129                                 /* no more to look at */
10130                                 break;
10131                         }
10132                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10133                                 /* We don't report these */
10134                                 continue;
10135                         }
10136                         cnt_of_skipped++;
10137                 }
10138                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10139                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10140
10141                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10142
10143                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10144                         ovh = SCTP_MIN_OVERHEAD;
10145                 } else {
10146                         ovh = SCTP_MIN_V4_OVERHEAD;
10147                 }
10148                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10149                         /* trim to a mtu size */
10150                         cnt_of_space = asoc->smallest_mtu - ovh;
10151                 }
10152                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10153                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10154                             0xff, 0, cnt_of_skipped,
10155                             asoc->advanced_peer_ack_point);
10156
10157                 }
10158                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10159                 if (cnt_of_space < space_needed) {
10160                         /*-
10161                          * ok we must trim down the chunk by lowering the
10162                          * advance peer ack point.
10163                          */
10164                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10165                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10166                                     0xff, 0xff, cnt_of_space,
10167                                     space_needed);
10168                         }
10169                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10170                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10171                         /*-
10172                          * Go through and find the TSN that will be the one
10173                          * we report.
10174                          */
10175                         at = TAILQ_FIRST(&asoc->sent_queue);
10176                         if (at != NULL) {
10177                                 for (i = 0; i < cnt_of_skipped; i++) {
10178                                         tp1 = TAILQ_NEXT(at, sctp_next);
10179                                         if (tp1 == NULL) {
10180                                                 break;
10181                                         }
10182                                         at = tp1;
10183                                 }
10184                         }
10185                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10186                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10187                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10188                                     asoc->advanced_peer_ack_point);
10189                         }
10190                         last = at;
10191                         /*-
10192                          * last now points to last one I can report, update
10193                          * peer ack point
10194                          */
10195                         if (last)
10196                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10197                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10198                             cnt_of_skipped * sizeof(struct sctp_strseq);
10199                 }
10200                 chk->send_size = space_needed;
10201                 /* Setup the chunk */
10202                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10203                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10204                 fwdtsn->ch.chunk_flags = 0;
10205                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10206                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10207                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10208                 fwdtsn++;
10209                 /*-
10210                  * Move pointer to after the fwdtsn and transfer to the
10211                  * strseq pointer.
10212                  */
10213                 strseq = (struct sctp_strseq *)fwdtsn;
10214                 /*-
10215                  * Now populate the strseq list. This is done blindly
10216                  * without pulling out duplicate stream info. This is
10217                  * inefficent but won't harm the process since the peer will
10218                  * look at these in sequence and will thus release anything.
10219                  * It could mean we exceed the PMTU and chop off some that
10220                  * we could have included.. but this is unlikely (aka 1432/4
10221                  * would mean 300+ stream seq's would have to be reported in
10222                  * one FWD-TSN. With a bit of work we can later FIX this to
10223                  * optimize and pull out duplcates.. but it does add more
10224                  * overhead. So for now... not!
10225                  */
10226                 at = TAILQ_FIRST(&asoc->sent_queue);
10227                 for (i = 0; i < cnt_of_skipped; i++) {
10228                         tp1 = TAILQ_NEXT(at, sctp_next);
10229                         if (tp1 == NULL)
10230                                 break;
10231                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10232                                 /* We don't report these */
10233                                 i--;
10234                                 at = tp1;
10235                                 continue;
10236                         }
10237                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10238                                 at->rec.data.fwd_tsn_cnt = 0;
10239                         }
10240                         strseq->stream = ntohs(at->rec.data.stream_number);
10241                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10242                         strseq++;
10243                         at = tp1;
10244                 }
10245         }
10246         return;
10247 }
10248
10249 void
10250 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10251 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10252     SCTP_UNUSED
10253 #endif
10254 )
10255 {
10256         /*-
10257          * Queue up a SACK or NR-SACK in the control queue.
10258          * We must first check to see if a SACK or NR-SACK is
10259          * somehow on the control queue.
10260          * If so, we will take and and remove the old one.
10261          */
10262         struct sctp_association *asoc;
10263         struct sctp_tmit_chunk *chk, *a_chk;
10264         struct sctp_sack_chunk *sack;
10265         struct sctp_nr_sack_chunk *nr_sack;
10266         struct sctp_gap_ack_block *gap_descriptor;
10267         struct sack_track *selector;
10268         int mergeable = 0;
10269         int offset;
10270         caddr_t limit;
10271         uint32_t *dup;
10272         int limit_reached = 0;
10273         unsigned int i, siz, j;
10274         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10275         int num_dups = 0;
10276         int space_req;
10277         uint32_t highest_tsn;
10278         uint8_t flags;
10279         uint8_t type;
10280         uint8_t tsn_map;
10281
10282         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10283             (stcb->asoc.peer_supports_nr_sack == 1)) {
10284                 type = SCTP_NR_SELECTIVE_ACK;
10285         } else {
10286                 type = SCTP_SELECTIVE_ACK;
10287         }
10288         a_chk = NULL;
10289         asoc = &stcb->asoc;
10290         SCTP_TCB_LOCK_ASSERT(stcb);
10291         if (asoc->last_data_chunk_from == NULL) {
10292                 /* Hmm we never received anything */
10293                 return;
10294         }
10295         sctp_slide_mapping_arrays(stcb);
10296         sctp_set_rwnd(stcb, asoc);
10297         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10298                 if (chk->rec.chunk_id.id == type) {
10299                         /* Hmm, found a sack already on queue, remove it */
10300                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10301                         asoc->ctrl_queue_cnt--;
10302                         a_chk = chk;
10303                         if (a_chk->data) {
10304                                 sctp_m_freem(a_chk->data);
10305                                 a_chk->data = NULL;
10306                         }
10307                         if (a_chk->whoTo) {
10308                                 sctp_free_remote_addr(a_chk->whoTo);
10309                                 a_chk->whoTo = NULL;
10310                         }
10311                         break;
10312                 }
10313         }
10314         if (a_chk == NULL) {
10315                 sctp_alloc_a_chunk(stcb, a_chk);
10316                 if (a_chk == NULL) {
10317                         /* No memory so we drop the idea, and set a timer */
10318                         if (stcb->asoc.delayed_ack) {
10319                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10320                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10321                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10322                                     stcb->sctp_ep, stcb, NULL);
10323                         } else {
10324                                 stcb->asoc.send_sack = 1;
10325                         }
10326                         return;
10327                 }
10328                 a_chk->copy_by_ref = 0;
10329                 a_chk->rec.chunk_id.id = type;
10330                 a_chk->rec.chunk_id.can_take_data = 1;
10331         }
10332         /* Clear our pkt counts */
10333         asoc->data_pkts_seen = 0;
10334
10335         a_chk->asoc = asoc;
10336         a_chk->snd_count = 0;
10337         a_chk->send_size = 0;   /* fill in later */
10338         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10339         a_chk->whoTo = NULL;
10340
10341         if ((asoc->numduptsns) ||
10342             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10343                 /*-
10344                  * Ok, we have some duplicates or the destination for the
10345                  * sack is unreachable, lets see if we can select an
10346                  * alternate than asoc->last_data_chunk_from
10347                  */
10348                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10349                     (asoc->used_alt_onsack > asoc->numnets)) {
10350                         /* We used an alt last time, don't this time */
10351                         a_chk->whoTo = NULL;
10352                 } else {
10353                         asoc->used_alt_onsack++;
10354                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10355                 }
10356                 if (a_chk->whoTo == NULL) {
10357                         /* Nope, no alternate */
10358                         a_chk->whoTo = asoc->last_data_chunk_from;
10359                         asoc->used_alt_onsack = 0;
10360                 }
10361         } else {
10362                 /*
10363                  * No duplicates so we use the last place we received data
10364                  * from.
10365                  */
10366                 asoc->used_alt_onsack = 0;
10367                 a_chk->whoTo = asoc->last_data_chunk_from;
10368         }
10369         if (a_chk->whoTo) {
10370                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10371         }
10372         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10373                 highest_tsn = asoc->highest_tsn_inside_map;
10374         } else {
10375                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10376         }
10377         if (highest_tsn == asoc->cumulative_tsn) {
10378                 /* no gaps */
10379                 if (type == SCTP_SELECTIVE_ACK) {
10380                         space_req = sizeof(struct sctp_sack_chunk);
10381                 } else {
10382                         space_req = sizeof(struct sctp_nr_sack_chunk);
10383                 }
10384         } else {
10385                 /* gaps get a cluster */
10386                 space_req = MCLBYTES;
10387         }
10388         /* Ok now lets formulate a MBUF with our sack */
10389         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10390         if ((a_chk->data == NULL) ||
10391             (a_chk->whoTo == NULL)) {
10392                 /* rats, no mbuf memory */
10393                 if (a_chk->data) {
10394                         /* was a problem with the destination */
10395                         sctp_m_freem(a_chk->data);
10396                         a_chk->data = NULL;
10397                 }
10398                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10399                 /* sa_ignore NO_NULL_CHK */
10400                 if (stcb->asoc.delayed_ack) {
10401                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10402                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10403                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10404                             stcb->sctp_ep, stcb, NULL);
10405                 } else {
10406                         stcb->asoc.send_sack = 1;
10407                 }
10408                 return;
10409         }
10410         /* ok, lets go through and fill it in */
10411         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10412         space = M_TRAILINGSPACE(a_chk->data);
10413         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10414                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10415         }
10416         limit = mtod(a_chk->data, caddr_t);
10417         limit += space;
10418
10419         flags = 0;
10420
10421         if ((asoc->sctp_cmt_on_off > 0) &&
10422             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10423                 /*-
10424                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10425                  * received, then set high bit to 1, else 0. Reset
10426                  * pkts_rcvd.
10427                  */
10428                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10429                 asoc->cmt_dac_pkts_rcvd = 0;
10430         }
10431 #ifdef SCTP_ASOCLOG_OF_TSNS
10432         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10433         stcb->asoc.cumack_log_atsnt++;
10434         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10435                 stcb->asoc.cumack_log_atsnt = 0;
10436         }
10437 #endif
10438         /* reset the readers interpretation */
10439         stcb->freed_by_sorcv_sincelast = 0;
10440
10441         if (type == SCTP_SELECTIVE_ACK) {
10442                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10443                 nr_sack = NULL;
10444                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10445                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10446                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10447                 } else {
10448                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10449                 }
10450         } else {
10451                 sack = NULL;
10452                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10453                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10454                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10455                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10456                 } else {
10457                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10458                 }
10459         }
10460
10461         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10462                 offset = 1;
10463         } else {
10464                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10465         }
10466         if (((type == SCTP_SELECTIVE_ACK) &&
10467             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10468             ((type == SCTP_NR_SELECTIVE_ACK) &&
10469             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10470                 /* we have a gap .. maybe */
10471                 for (i = 0; i < siz; i++) {
10472                         tsn_map = asoc->mapping_array[i];
10473                         if (type == SCTP_SELECTIVE_ACK) {
10474                                 tsn_map |= asoc->nr_mapping_array[i];
10475                         }
10476                         if (i == 0) {
10477                                 /*
10478                                  * Clear all bits corresponding to TSNs
10479                                  * smaller or equal to the cumulative TSN.
10480                                  */
10481                                 tsn_map &= (~0 << (1 - offset));
10482                         }
10483                         selector = &sack_array[tsn_map];
10484                         if (mergeable && selector->right_edge) {
10485                                 /*
10486                                  * Backup, left and right edges were ok to
10487                                  * merge.
10488                                  */
10489                                 num_gap_blocks--;
10490                                 gap_descriptor--;
10491                         }
10492                         if (selector->num_entries == 0)
10493                                 mergeable = 0;
10494                         else {
10495                                 for (j = 0; j < selector->num_entries; j++) {
10496                                         if (mergeable && selector->right_edge) {
10497                                                 /*
10498                                                  * do a merge by NOT setting
10499                                                  * the left side
10500                                                  */
10501                                                 mergeable = 0;
10502                                         } else {
10503                                                 /*
10504                                                  * no merge, set the left
10505                                                  * side
10506                                                  */
10507                                                 mergeable = 0;
10508                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10509                                         }
10510                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10511                                         num_gap_blocks++;
10512                                         gap_descriptor++;
10513                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10514                                                 /* no more room */
10515                                                 limit_reached = 1;
10516                                                 break;
10517                                         }
10518                                 }
10519                                 if (selector->left_edge) {
10520                                         mergeable = 1;
10521                                 }
10522                         }
10523                         if (limit_reached) {
10524                                 /* Reached the limit stop */
10525                                 break;
10526                         }
10527                         offset += 8;
10528                 }
10529         }
10530         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10531             (limit_reached == 0)) {
10532
10533                 mergeable = 0;
10534
10535                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10536                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10537                 } else {
10538                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10539                 }
10540
10541                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10542                         offset = 1;
10543                 } else {
10544                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10545                 }
10546                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10547                         /* we have a gap .. maybe */
10548                         for (i = 0; i < siz; i++) {
10549                                 tsn_map = asoc->nr_mapping_array[i];
10550                                 if (i == 0) {
10551                                         /*
10552                                          * Clear all bits corresponding to
10553                                          * TSNs smaller or equal to the
10554                                          * cumulative TSN.
10555                                          */
10556                                         tsn_map &= (~0 << (1 - offset));
10557                                 }
10558                                 selector = &sack_array[tsn_map];
10559                                 if (mergeable && selector->right_edge) {
10560                                         /*
10561                                          * Backup, left and right edges were
10562                                          * ok to merge.
10563                                          */
10564                                         num_nr_gap_blocks--;
10565                                         gap_descriptor--;
10566                                 }
10567                                 if (selector->num_entries == 0)
10568                                         mergeable = 0;
10569                                 else {
10570                                         for (j = 0; j < selector->num_entries; j++) {
10571                                                 if (mergeable && selector->right_edge) {
10572                                                         /*
10573                                                          * do a merge by NOT
10574                                                          * setting the left
10575                                                          * side
10576                                                          */
10577                                                         mergeable = 0;
10578                                                 } else {
10579                                                         /*
10580                                                          * no merge, set the
10581                                                          * left side
10582                                                          */
10583                                                         mergeable = 0;
10584                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10585                                                 }
10586                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10587                                                 num_nr_gap_blocks++;
10588                                                 gap_descriptor++;
10589                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10590                                                         /* no more room */
10591                                                         limit_reached = 1;
10592                                                         break;
10593                                                 }
10594                                         }
10595                                         if (selector->left_edge) {
10596                                                 mergeable = 1;
10597                                         }
10598                                 }
10599                                 if (limit_reached) {
10600                                         /* Reached the limit stop */
10601                                         break;
10602                                 }
10603                                 offset += 8;
10604                         }
10605                 }
10606         }
10607         /* now we must add any dups we are going to report. */
10608         if ((limit_reached == 0) && (asoc->numduptsns)) {
10609                 dup = (uint32_t *) gap_descriptor;
10610                 for (i = 0; i < asoc->numduptsns; i++) {
10611                         *dup = htonl(asoc->dup_tsns[i]);
10612                         dup++;
10613                         num_dups++;
10614                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10615                                 /* no more room */
10616                                 break;
10617                         }
10618                 }
10619                 asoc->numduptsns = 0;
10620         }
10621         /*
10622          * now that the chunk is prepared queue it to the control chunk
10623          * queue.
10624          */
10625         if (type == SCTP_SELECTIVE_ACK) {
10626                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10627                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10628                     num_dups * sizeof(int32_t);
10629                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10630                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10631                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10632                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10633                 sack->sack.num_dup_tsns = htons(num_dups);
10634                 sack->ch.chunk_type = type;
10635                 sack->ch.chunk_flags = flags;
10636                 sack->ch.chunk_length = htons(a_chk->send_size);
10637         } else {
10638                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10639                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10640                     num_dups * sizeof(int32_t);
10641                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10642                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10643                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10644                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10645                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10646                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10647                 nr_sack->nr_sack.reserved = 0;
10648                 nr_sack->ch.chunk_type = type;
10649                 nr_sack->ch.chunk_flags = flags;
10650                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10651         }
10652         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10653         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10654         asoc->ctrl_queue_cnt++;
10655         asoc->send_sack = 0;
10656         SCTP_STAT_INCR(sctps_sendsacks);
10657         return;
10658 }
10659
10660 void
10661 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10662 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10663     SCTP_UNUSED
10664 #endif
10665 )
10666 {
10667         struct mbuf *m_abort, *m, *m_last;
10668         struct mbuf *m_out, *m_end = NULL;
10669         struct sctp_abort_chunk *abort;
10670         struct sctp_auth_chunk *auth = NULL;
10671         struct sctp_nets *net;
10672         uint32_t vtag;
10673         uint32_t auth_offset = 0;
10674         uint16_t cause_len, chunk_len, padding_len;
10675
10676         SCTP_TCB_LOCK_ASSERT(stcb);
10677         /*-
10678          * Add an AUTH chunk, if chunk requires it and save the offset into
10679          * the chain for AUTH
10680          */
10681         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10682             stcb->asoc.peer_auth_chunks)) {
10683                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10684                     stcb, SCTP_ABORT_ASSOCIATION);
10685                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10686         } else {
10687                 m_out = NULL;
10688         }
10689         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10690         if (m_abort == NULL) {
10691                 if (m_out) {
10692                         sctp_m_freem(m_out);
10693                 }
10694                 if (operr) {
10695                         sctp_m_freem(operr);
10696                 }
10697                 return;
10698         }
10699         /* link in any error */
10700         SCTP_BUF_NEXT(m_abort) = operr;
10701         cause_len = 0;
10702         m_last = NULL;
10703         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10704                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10705                 if (SCTP_BUF_NEXT(m) == NULL) {
10706                         m_last = m;
10707                 }
10708         }
10709         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10710         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10711         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10712         if (m_out == NULL) {
10713                 /* NO Auth chunk prepended, so reserve space in front */
10714                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10715                 m_out = m_abort;
10716         } else {
10717                 /* Put AUTH chunk at the front of the chain */
10718                 SCTP_BUF_NEXT(m_end) = m_abort;
10719         }
10720         if (stcb->asoc.alternate) {
10721                 net = stcb->asoc.alternate;
10722         } else {
10723                 net = stcb->asoc.primary_destination;
10724         }
10725         /* Fill in the ABORT chunk header. */
10726         abort = mtod(m_abort, struct sctp_abort_chunk *);
10727         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10728         if (stcb->asoc.peer_vtag == 0) {
10729                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10730                 vtag = stcb->asoc.my_vtag;
10731                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10732         } else {
10733                 vtag = stcb->asoc.peer_vtag;
10734                 abort->ch.chunk_flags = 0;
10735         }
10736         abort->ch.chunk_length = htons(chunk_len);
10737         /* Add padding, if necessary. */
10738         if (padding_len > 0) {
10739                 if ((m_last == NULL) || sctp_add_pad_tombuf(m_last, padding_len)) {
10740                         sctp_m_freem(m_out);
10741                         return;
10742                 }
10743         }
10744         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10745             (struct sockaddr *)&net->ro._l_addr,
10746             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10747             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10748             stcb->asoc.primary_destination->port, NULL,
10749             0, 0,
10750             so_locked);
10751         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10752 }
10753
10754 void
10755 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10756     struct sctp_nets *net,
10757     int reflect_vtag)
10758 {
10759         /* formulate and SEND a SHUTDOWN-COMPLETE */
10760         struct mbuf *m_shutdown_comp;
10761         struct sctp_shutdown_complete_chunk *shutdown_complete;
10762         uint32_t vtag;
10763         uint8_t flags;
10764
10765         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10766         if (m_shutdown_comp == NULL) {
10767                 /* no mbuf's */
10768                 return;
10769         }
10770         if (reflect_vtag) {
10771                 flags = SCTP_HAD_NO_TCB;
10772                 vtag = stcb->asoc.my_vtag;
10773         } else {
10774                 flags = 0;
10775                 vtag = stcb->asoc.peer_vtag;
10776         }
10777         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10778         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10779         shutdown_complete->ch.chunk_flags = flags;
10780         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10781         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10782         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10783             (struct sockaddr *)&net->ro._l_addr,
10784             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10785             stcb->sctp_ep->sctp_lport, stcb->rport,
10786             htonl(vtag),
10787             net->port, NULL,
10788             0, 0,
10789             SCTP_SO_NOT_LOCKED);
10790         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10791         return;
10792 }
10793
10794 static void
10795 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10796     struct sctphdr *sh, uint32_t vtag,
10797     uint8_t type, struct mbuf *cause,
10798     uint8_t use_mflowid, uint32_t mflowid,
10799     uint32_t vrf_id, uint16_t port)
10800 {
10801         struct mbuf *o_pak;
10802         struct mbuf *mout;
10803         struct sctphdr *shout;
10804         struct sctp_chunkhdr *ch;
10805         struct udphdr *udp;
10806         int len, cause_len, padding_len, ret;
10807
10808 #ifdef INET
10809         struct sockaddr_in *src_sin, *dst_sin;
10810         struct ip *ip;
10811
10812 #endif
10813 #ifdef INET6
10814         struct sockaddr_in6 *src_sin6, *dst_sin6;
10815         struct ip6_hdr *ip6;
10816
10817 #endif
10818
10819         /* Compute the length of the cause and add final padding. */
10820         cause_len = 0;
10821         if (cause != NULL) {
10822                 struct mbuf *m_at, *m_last = NULL;
10823
10824                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10825                         if (SCTP_BUF_NEXT(m_at) == NULL)
10826                                 m_last = m_at;
10827                         cause_len += SCTP_BUF_LEN(m_at);
10828                 }
10829                 padding_len = cause_len % 4;
10830                 if (padding_len != 0) {
10831                         padding_len = 4 - padding_len;
10832                 }
10833                 if (padding_len != 0) {
10834                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10835                                 sctp_m_freem(cause);
10836                                 return;
10837                         }
10838                 }
10839         } else {
10840                 padding_len = 0;
10841         }
10842         /* Get an mbuf for the header. */
10843         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10844         switch (dst->sa_family) {
10845 #ifdef INET
10846         case AF_INET:
10847                 len += sizeof(struct ip);
10848                 break;
10849 #endif
10850 #ifdef INET6
10851         case AF_INET6:
10852                 len += sizeof(struct ip6_hdr);
10853                 break;
10854 #endif
10855         default:
10856                 break;
10857         }
10858         if (port) {
10859                 len += sizeof(struct udphdr);
10860         }
10861         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10862         if (mout == NULL) {
10863                 if (cause) {
10864                         sctp_m_freem(cause);
10865                 }
10866                 return;
10867         }
10868         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10869         SCTP_BUF_LEN(mout) = len;
10870         SCTP_BUF_NEXT(mout) = cause;
10871         if (use_mflowid != 0) {
10872                 mout->m_pkthdr.flowid = mflowid;
10873                 mout->m_flags |= M_FLOWID;
10874         }
10875 #ifdef INET
10876         ip = NULL;
10877 #endif
10878 #ifdef INET6
10879         ip6 = NULL;
10880 #endif
10881         switch (dst->sa_family) {
10882 #ifdef INET
10883         case AF_INET:
10884                 src_sin = (struct sockaddr_in *)src;
10885                 dst_sin = (struct sockaddr_in *)dst;
10886                 ip = mtod(mout, struct ip *);
10887                 ip->ip_v = IPVERSION;
10888                 ip->ip_hl = (sizeof(struct ip) >> 2);
10889                 ip->ip_tos = 0;
10890                 ip->ip_id = ip_newid();
10891                 ip->ip_off = 0;
10892                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10893                 if (port) {
10894                         ip->ip_p = IPPROTO_UDP;
10895                 } else {
10896                         ip->ip_p = IPPROTO_SCTP;
10897                 }
10898                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10899                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10900                 ip->ip_sum = 0;
10901                 len = sizeof(struct ip);
10902                 shout = (struct sctphdr *)((caddr_t)ip + len);
10903                 break;
10904 #endif
10905 #ifdef INET6
10906         case AF_INET6:
10907                 src_sin6 = (struct sockaddr_in6 *)src;
10908                 dst_sin6 = (struct sockaddr_in6 *)dst;
10909                 ip6 = mtod(mout, struct ip6_hdr *);
10910                 ip6->ip6_flow = htonl(0x60000000);
10911                 if (V_ip6_auto_flowlabel) {
10912                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10913                 }
10914                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10915                 if (port) {
10916                         ip6->ip6_nxt = IPPROTO_UDP;
10917                 } else {
10918                         ip6->ip6_nxt = IPPROTO_SCTP;
10919                 }
10920                 ip6->ip6_src = dst_sin6->sin6_addr;
10921                 ip6->ip6_dst = src_sin6->sin6_addr;
10922                 len = sizeof(struct ip6_hdr);
10923                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
10924                 break;
10925 #endif
10926         default:
10927                 len = 0;
10928                 shout = mtod(mout, struct sctphdr *);
10929                 break;
10930         }
10931         if (port) {
10932                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10933                         sctp_m_freem(mout);
10934                         return;
10935                 }
10936                 udp = (struct udphdr *)shout;
10937                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10938                 udp->uh_dport = port;
10939                 udp->uh_sum = 0;
10940                 udp->uh_ulen = htons(sizeof(struct udphdr) +
10941                     sizeof(struct sctphdr) +
10942                     sizeof(struct sctp_chunkhdr) +
10943                     cause_len + padding_len);
10944                 len += sizeof(struct udphdr);
10945                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
10946         } else {
10947                 udp = NULL;
10948         }
10949         shout->src_port = sh->dest_port;
10950         shout->dest_port = sh->src_port;
10951         shout->checksum = 0;
10952         if (vtag) {
10953                 shout->v_tag = htonl(vtag);
10954         } else {
10955                 shout->v_tag = sh->v_tag;
10956         }
10957         len += sizeof(struct sctphdr);
10958         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
10959         ch->chunk_type = type;
10960         if (vtag) {
10961                 ch->chunk_flags = 0;
10962         } else {
10963                 ch->chunk_flags = SCTP_HAD_NO_TCB;
10964         }
10965         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
10966         len += sizeof(struct sctp_chunkhdr);
10967         len += cause_len + padding_len;
10968
10969         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10970                 sctp_m_freem(mout);
10971                 return;
10972         }
10973         SCTP_ATTACH_CHAIN(o_pak, mout, len);
10974         switch (dst->sa_family) {
10975 #ifdef INET
10976         case AF_INET:
10977                 if (port) {
10978                         if (V_udp_cksum) {
10979                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10980                         } else {
10981                                 udp->uh_sum = 0;
10982                         }
10983                 }
10984                 ip->ip_len = len;
10985                 if (port) {
10986 #if defined(SCTP_WITH_NO_CSUM)
10987                         SCTP_STAT_INCR(sctps_sendnocrc);
10988 #else
10989                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
10990                         SCTP_STAT_INCR(sctps_sendswcrc);
10991 #endif
10992                         if (V_udp_cksum) {
10993                                 SCTP_ENABLE_UDP_CSUM(o_pak);
10994                         }
10995                 } else {
10996 #if defined(SCTP_WITH_NO_CSUM)
10997                         SCTP_STAT_INCR(sctps_sendnocrc);
10998 #else
10999                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11000                         mout->m_pkthdr.csum_data = 0;
11001                         SCTP_STAT_INCR(sctps_sendhwcrc);
11002 #endif
11003                 }
11004 #ifdef SCTP_PACKET_LOGGING
11005                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11006                         sctp_packet_log(o_pak);
11007                 }
11008 #endif
11009                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11010                 break;
11011 #endif
11012 #ifdef INET6
11013         case AF_INET6:
11014                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11015                 if (port) {
11016 #if defined(SCTP_WITH_NO_CSUM)
11017                         SCTP_STAT_INCR(sctps_sendnocrc);
11018 #else
11019                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11020                         SCTP_STAT_INCR(sctps_sendswcrc);
11021 #endif
11022                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11023                                 udp->uh_sum = 0xffff;
11024                         }
11025                 } else {
11026 #if defined(SCTP_WITH_NO_CSUM)
11027                         SCTP_STAT_INCR(sctps_sendnocrc);
11028 #else
11029                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11030                         mout->m_pkthdr.csum_data = 0;
11031                         SCTP_STAT_INCR(sctps_sendhwcrc);
11032 #endif
11033                 }
11034 #ifdef SCTP_PACKET_LOGGING
11035                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11036                         sctp_packet_log(o_pak);
11037                 }
11038 #endif
11039                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11040                 break;
11041 #endif
11042         default:
11043                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11044                     dst->sa_family);
11045                 sctp_m_freem(mout);
11046                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11047                 return;
11048         }
11049         SCTP_STAT_INCR(sctps_sendpackets);
11050         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11051         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11052         return;
11053 }
11054
11055 void
11056 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11057     struct sctphdr *sh,
11058     uint8_t use_mflowid, uint32_t mflowid,
11059     uint32_t vrf_id, uint16_t port)
11060 {
11061         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11062             use_mflowid, mflowid,
11063             vrf_id, port);
11064 }
11065
11066 void
11067 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11068 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11069     SCTP_UNUSED
11070 #endif
11071 )
11072 {
11073         struct sctp_tmit_chunk *chk;
11074         struct sctp_heartbeat_chunk *hb;
11075         struct timeval now;
11076
11077         SCTP_TCB_LOCK_ASSERT(stcb);
11078         if (net == NULL) {
11079                 return;
11080         }
11081         (void)SCTP_GETTIME_TIMEVAL(&now);
11082         switch (net->ro._l_addr.sa.sa_family) {
11083 #ifdef INET
11084         case AF_INET:
11085                 break;
11086 #endif
11087 #ifdef INET6
11088         case AF_INET6:
11089                 break;
11090 #endif
11091         default:
11092                 return;
11093         }
11094         sctp_alloc_a_chunk(stcb, chk);
11095         if (chk == NULL) {
11096                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11097                 return;
11098         }
11099         chk->copy_by_ref = 0;
11100         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11101         chk->rec.chunk_id.can_take_data = 1;
11102         chk->asoc = &stcb->asoc;
11103         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11104
11105         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11106         if (chk->data == NULL) {
11107                 sctp_free_a_chunk(stcb, chk, so_locked);
11108                 return;
11109         }
11110         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11111         SCTP_BUF_LEN(chk->data) = chk->send_size;
11112         chk->sent = SCTP_DATAGRAM_UNSENT;
11113         chk->snd_count = 0;
11114         chk->whoTo = net;
11115         atomic_add_int(&chk->whoTo->ref_count, 1);
11116         /* Now we have a mbuf that we can fill in with the details */
11117         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11118         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11119         /* fill out chunk header */
11120         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11121         hb->ch.chunk_flags = 0;
11122         hb->ch.chunk_length = htons(chk->send_size);
11123         /* Fill out hb parameter */
11124         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11125         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11126         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11127         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11128         /* Did our user request this one, put it in */
11129         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11130         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11131         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11132                 /*
11133                  * we only take from the entropy pool if the address is not
11134                  * confirmed.
11135                  */
11136                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11137                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11138         } else {
11139                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11140                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11141         }
11142         switch (net->ro._l_addr.sa.sa_family) {
11143 #ifdef INET
11144         case AF_INET:
11145                 memcpy(hb->heartbeat.hb_info.address,
11146                     &net->ro._l_addr.sin.sin_addr,
11147                     sizeof(net->ro._l_addr.sin.sin_addr));
11148                 break;
11149 #endif
11150 #ifdef INET6
11151         case AF_INET6:
11152                 memcpy(hb->heartbeat.hb_info.address,
11153                     &net->ro._l_addr.sin6.sin6_addr,
11154                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11155                 break;
11156 #endif
11157         default:
11158                 return;
11159                 break;
11160         }
11161         net->hb_responded = 0;
11162         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11163         stcb->asoc.ctrl_queue_cnt++;
11164         SCTP_STAT_INCR(sctps_sendheartbeat);
11165         return;
11166 }
11167
11168 void
11169 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11170     uint32_t high_tsn)
11171 {
11172         struct sctp_association *asoc;
11173         struct sctp_ecne_chunk *ecne;
11174         struct sctp_tmit_chunk *chk;
11175
11176         if (net == NULL) {
11177                 return;
11178         }
11179         asoc = &stcb->asoc;
11180         SCTP_TCB_LOCK_ASSERT(stcb);
11181         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11182                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11183                         /* found a previous ECN_ECHO update it if needed */
11184                         uint32_t cnt, ctsn;
11185
11186                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11187                         ctsn = ntohl(ecne->tsn);
11188                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11189                                 ecne->tsn = htonl(high_tsn);
11190                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11191                         }
11192                         cnt = ntohl(ecne->num_pkts_since_cwr);
11193                         cnt++;
11194                         ecne->num_pkts_since_cwr = htonl(cnt);
11195                         return;
11196                 }
11197         }
11198         /* nope could not find one to update so we must build one */
11199         sctp_alloc_a_chunk(stcb, chk);
11200         if (chk == NULL) {
11201                 return;
11202         }
11203         chk->copy_by_ref = 0;
11204         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11205         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11206         chk->rec.chunk_id.can_take_data = 0;
11207         chk->asoc = &stcb->asoc;
11208         chk->send_size = sizeof(struct sctp_ecne_chunk);
11209         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11210         if (chk->data == NULL) {
11211                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11212                 return;
11213         }
11214         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11215         SCTP_BUF_LEN(chk->data) = chk->send_size;
11216         chk->sent = SCTP_DATAGRAM_UNSENT;
11217         chk->snd_count = 0;
11218         chk->whoTo = net;
11219         atomic_add_int(&chk->whoTo->ref_count, 1);
11220
11221         stcb->asoc.ecn_echo_cnt_onq++;
11222         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11223         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11224         ecne->ch.chunk_flags = 0;
11225         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11226         ecne->tsn = htonl(high_tsn);
11227         ecne->num_pkts_since_cwr = htonl(1);
11228         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11229         asoc->ctrl_queue_cnt++;
11230 }
11231
11232 void
11233 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11234     struct mbuf *m, int len, int iphlen, int bad_crc)
11235 {
11236         struct sctp_association *asoc;
11237         struct sctp_pktdrop_chunk *drp;
11238         struct sctp_tmit_chunk *chk;
11239         uint8_t *datap;
11240         int was_trunc = 0;
11241         int fullsz = 0;
11242         long spc;
11243         int offset;
11244         struct sctp_chunkhdr *ch, chunk_buf;
11245         unsigned int chk_length;
11246
11247         if (!stcb) {
11248                 return;
11249         }
11250         asoc = &stcb->asoc;
11251         SCTP_TCB_LOCK_ASSERT(stcb);
11252         if (asoc->peer_supports_pktdrop == 0) {
11253                 /*-
11254                  * peer must declare support before I send one.
11255                  */
11256                 return;
11257         }
11258         if (stcb->sctp_socket == NULL) {
11259                 return;
11260         }
11261         sctp_alloc_a_chunk(stcb, chk);
11262         if (chk == NULL) {
11263                 return;
11264         }
11265         chk->copy_by_ref = 0;
11266         len -= iphlen;
11267         chk->send_size = len;
11268         /* Validate that we do not have an ABORT in here. */
11269         offset = iphlen + sizeof(struct sctphdr);
11270         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11271             sizeof(*ch), (uint8_t *) & chunk_buf);
11272         while (ch != NULL) {
11273                 chk_length = ntohs(ch->chunk_length);
11274                 if (chk_length < sizeof(*ch)) {
11275                         /* break to abort land */
11276                         break;
11277                 }
11278                 switch (ch->chunk_type) {
11279                 case SCTP_PACKET_DROPPED:
11280                 case SCTP_ABORT_ASSOCIATION:
11281                 case SCTP_INITIATION_ACK:
11282                         /**
11283                          * We don't respond with an PKT-DROP to an ABORT
11284                          * or PKT-DROP. We also do not respond to an
11285                          * INIT-ACK, because we can't know if the initiation
11286                          * tag is correct or not.
11287                          */
11288                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11289                         return;
11290                 default:
11291                         break;
11292                 }
11293                 offset += SCTP_SIZE32(chk_length);
11294                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11295                     sizeof(*ch), (uint8_t *) & chunk_buf);
11296         }
11297
11298         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11299             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11300                 /*
11301                  * only send 1 mtu worth, trim off the excess on the end.
11302                  */
11303                 fullsz = len;
11304                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11305                 was_trunc = 1;
11306         }
11307         chk->asoc = &stcb->asoc;
11308         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11309         if (chk->data == NULL) {
11310 jump_out:
11311                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11312                 return;
11313         }
11314         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11315         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11316         if (drp == NULL) {
11317                 sctp_m_freem(chk->data);
11318                 chk->data = NULL;
11319                 goto jump_out;
11320         }
11321         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11322             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11323         chk->book_size_scale = 0;
11324         if (was_trunc) {
11325                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11326                 drp->trunc_len = htons(fullsz);
11327                 /*
11328                  * Len is already adjusted to size minus overhead above take
11329                  * out the pkt_drop chunk itself from it.
11330                  */
11331                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11332                 len = chk->send_size;
11333         } else {
11334                 /* no truncation needed */
11335                 drp->ch.chunk_flags = 0;
11336                 drp->trunc_len = htons(0);
11337         }
11338         if (bad_crc) {
11339                 drp->ch.chunk_flags |= SCTP_BADCRC;
11340         }
11341         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11342         SCTP_BUF_LEN(chk->data) = chk->send_size;
11343         chk->sent = SCTP_DATAGRAM_UNSENT;
11344         chk->snd_count = 0;
11345         if (net) {
11346                 /* we should hit here */
11347                 chk->whoTo = net;
11348                 atomic_add_int(&chk->whoTo->ref_count, 1);
11349         } else {
11350                 chk->whoTo = NULL;
11351         }
11352         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11353         chk->rec.chunk_id.can_take_data = 1;
11354         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11355         drp->ch.chunk_length = htons(chk->send_size);
11356         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11357         if (spc < 0) {
11358                 spc = 0;
11359         }
11360         drp->bottle_bw = htonl(spc);
11361         if (asoc->my_rwnd) {
11362                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11363                     asoc->size_on_all_streams +
11364                     asoc->my_rwnd_control_len +
11365                     stcb->sctp_socket->so_rcv.sb_cc);
11366         } else {
11367                 /*-
11368                  * If my rwnd is 0, possibly from mbuf depletion as well as
11369                  * space used, tell the peer there is NO space aka onq == bw
11370                  */
11371                 drp->current_onq = htonl(spc);
11372         }
11373         drp->reserved = 0;
11374         datap = drp->data;
11375         m_copydata(m, iphlen, len, (caddr_t)datap);
11376         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11377         asoc->ctrl_queue_cnt++;
11378 }
11379
11380 void
11381 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11382 {
11383         struct sctp_association *asoc;
11384         struct sctp_cwr_chunk *cwr;
11385         struct sctp_tmit_chunk *chk;
11386
11387         SCTP_TCB_LOCK_ASSERT(stcb);
11388         if (net == NULL) {
11389                 return;
11390         }
11391         asoc = &stcb->asoc;
11392         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11393                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11394                         /*
11395                          * found a previous CWR queued to same destination
11396                          * update it if needed
11397                          */
11398                         uint32_t ctsn;
11399
11400                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11401                         ctsn = ntohl(cwr->tsn);
11402                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11403                                 cwr->tsn = htonl(high_tsn);
11404                         }
11405                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11406                                 /* Make sure override is carried */
11407                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11408                         }
11409                         return;
11410                 }
11411         }
11412         sctp_alloc_a_chunk(stcb, chk);
11413         if (chk == NULL) {
11414                 return;
11415         }
11416         chk->copy_by_ref = 0;
11417         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11418         chk->rec.chunk_id.can_take_data = 1;
11419         chk->asoc = &stcb->asoc;
11420         chk->send_size = sizeof(struct sctp_cwr_chunk);
11421         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11422         if (chk->data == NULL) {
11423                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11424                 return;
11425         }
11426         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11427         SCTP_BUF_LEN(chk->data) = chk->send_size;
11428         chk->sent = SCTP_DATAGRAM_UNSENT;
11429         chk->snd_count = 0;
11430         chk->whoTo = net;
11431         atomic_add_int(&chk->whoTo->ref_count, 1);
11432         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11433         cwr->ch.chunk_type = SCTP_ECN_CWR;
11434         cwr->ch.chunk_flags = override;
11435         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11436         cwr->tsn = htonl(high_tsn);
11437         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11438         asoc->ctrl_queue_cnt++;
11439 }
11440
11441 void
11442 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11443     int number_entries, uint16_t * list,
11444     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11445 {
11446         uint16_t len, old_len, i;
11447         struct sctp_stream_reset_out_request *req_out;
11448         struct sctp_chunkhdr *ch;
11449
11450         ch = mtod(chk->data, struct sctp_chunkhdr *);
11451         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11452
11453         /* get to new offset for the param. */
11454         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11455         /* now how long will this param be? */
11456         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11457         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11458         req_out->ph.param_length = htons(len);
11459         req_out->request_seq = htonl(seq);
11460         req_out->response_seq = htonl(resp_seq);
11461         req_out->send_reset_at_tsn = htonl(last_sent);
11462         if (number_entries) {
11463                 for (i = 0; i < number_entries; i++) {
11464                         req_out->list_of_streams[i] = htons(list[i]);
11465                 }
11466         }
11467         if (SCTP_SIZE32(len) > len) {
11468                 /*-
11469                  * Need to worry about the pad we may end up adding to the
11470                  * end. This is easy since the struct is either aligned to 4
11471                  * bytes or 2 bytes off.
11472                  */
11473                 req_out->list_of_streams[number_entries] = 0;
11474         }
11475         /* now fix the chunk length */
11476         ch->chunk_length = htons(len + old_len);
11477         chk->book_size = len + old_len;
11478         chk->book_size_scale = 0;
11479         chk->send_size = SCTP_SIZE32(chk->book_size);
11480         SCTP_BUF_LEN(chk->data) = chk->send_size;
11481         return;
11482 }
11483
11484 static void
11485 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11486     int number_entries, uint16_t * list,
11487     uint32_t seq)
11488 {
11489         uint16_t len, old_len, i;
11490         struct sctp_stream_reset_in_request *req_in;
11491         struct sctp_chunkhdr *ch;
11492
11493         ch = mtod(chk->data, struct sctp_chunkhdr *);
11494         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11495
11496         /* get to new offset for the param. */
11497         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11498         /* now how long will this param be? */
11499         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11500         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11501         req_in->ph.param_length = htons(len);
11502         req_in->request_seq = htonl(seq);
11503         if (number_entries) {
11504                 for (i = 0; i < number_entries; i++) {
11505                         req_in->list_of_streams[i] = htons(list[i]);
11506                 }
11507         }
11508         if (SCTP_SIZE32(len) > len) {
11509                 /*-
11510                  * Need to worry about the pad we may end up adding to the
11511                  * end. This is easy since the struct is either aligned to 4
11512                  * bytes or 2 bytes off.
11513                  */
11514                 req_in->list_of_streams[number_entries] = 0;
11515         }
11516         /* now fix the chunk length */
11517         ch->chunk_length = htons(len + old_len);
11518         chk->book_size = len + old_len;
11519         chk->book_size_scale = 0;
11520         chk->send_size = SCTP_SIZE32(chk->book_size);
11521         SCTP_BUF_LEN(chk->data) = chk->send_size;
11522         return;
11523 }
11524
11525 static void
11526 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11527     uint32_t seq)
11528 {
11529         uint16_t len, old_len;
11530         struct sctp_stream_reset_tsn_request *req_tsn;
11531         struct sctp_chunkhdr *ch;
11532
11533         ch = mtod(chk->data, struct sctp_chunkhdr *);
11534         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11535
11536         /* get to new offset for the param. */
11537         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11538         /* now how long will this param be? */
11539         len = sizeof(struct sctp_stream_reset_tsn_request);
11540         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11541         req_tsn->ph.param_length = htons(len);
11542         req_tsn->request_seq = htonl(seq);
11543
11544         /* now fix the chunk length */
11545         ch->chunk_length = htons(len + old_len);
11546         chk->send_size = len + old_len;
11547         chk->book_size = SCTP_SIZE32(chk->send_size);
11548         chk->book_size_scale = 0;
11549         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11550         return;
11551 }
11552
11553 void
11554 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11555     uint32_t resp_seq, uint32_t result)
11556 {
11557         uint16_t len, old_len;
11558         struct sctp_stream_reset_response *resp;
11559         struct sctp_chunkhdr *ch;
11560
11561         ch = mtod(chk->data, struct sctp_chunkhdr *);
11562         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11563
11564         /* get to new offset for the param. */
11565         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11566         /* now how long will this param be? */
11567         len = sizeof(struct sctp_stream_reset_response);
11568         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11569         resp->ph.param_length = htons(len);
11570         resp->response_seq = htonl(resp_seq);
11571         resp->result = ntohl(result);
11572
11573         /* now fix the chunk length */
11574         ch->chunk_length = htons(len + old_len);
11575         chk->book_size = len + old_len;
11576         chk->book_size_scale = 0;
11577         chk->send_size = SCTP_SIZE32(chk->book_size);
11578         SCTP_BUF_LEN(chk->data) = chk->send_size;
11579         return;
11580 }
11581
11582 void
11583 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11584     uint32_t resp_seq, uint32_t result,
11585     uint32_t send_una, uint32_t recv_next)
11586 {
11587         uint16_t len, old_len;
11588         struct sctp_stream_reset_response_tsn *resp;
11589         struct sctp_chunkhdr *ch;
11590
11591         ch = mtod(chk->data, struct sctp_chunkhdr *);
11592         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11593
11594         /* get to new offset for the param. */
11595         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11596         /* now how long will this param be? */
11597         len = sizeof(struct sctp_stream_reset_response_tsn);
11598         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11599         resp->ph.param_length = htons(len);
11600         resp->response_seq = htonl(resp_seq);
11601         resp->result = htonl(result);
11602         resp->senders_next_tsn = htonl(send_una);
11603         resp->receivers_next_tsn = htonl(recv_next);
11604
11605         /* now fix the chunk length */
11606         ch->chunk_length = htons(len + old_len);
11607         chk->book_size = len + old_len;
11608         chk->send_size = SCTP_SIZE32(chk->book_size);
11609         chk->book_size_scale = 0;
11610         SCTP_BUF_LEN(chk->data) = chk->send_size;
11611         return;
11612 }
11613
11614 static void
11615 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11616     uint32_t seq,
11617     uint16_t adding)
11618 {
11619         uint16_t len, old_len;
11620         struct sctp_chunkhdr *ch;
11621         struct sctp_stream_reset_add_strm *addstr;
11622
11623         ch = mtod(chk->data, struct sctp_chunkhdr *);
11624         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11625
11626         /* get to new offset for the param. */
11627         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11628         /* now how long will this param be? */
11629         len = sizeof(struct sctp_stream_reset_add_strm);
11630
11631         /* Fill it out. */
11632         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11633         addstr->ph.param_length = htons(len);
11634         addstr->request_seq = htonl(seq);
11635         addstr->number_of_streams = htons(adding);
11636         addstr->reserved = 0;
11637
11638         /* now fix the chunk length */
11639         ch->chunk_length = htons(len + old_len);
11640         chk->send_size = len + old_len;
11641         chk->book_size = SCTP_SIZE32(chk->send_size);
11642         chk->book_size_scale = 0;
11643         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11644         return;
11645 }
11646
11647 static void
11648 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11649     uint32_t seq,
11650     uint16_t adding)
11651 {
11652         uint16_t len, old_len;
11653         struct sctp_chunkhdr *ch;
11654         struct sctp_stream_reset_add_strm *addstr;
11655
11656         ch = mtod(chk->data, struct sctp_chunkhdr *);
11657         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11658
11659         /* get to new offset for the param. */
11660         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11661         /* now how long will this param be? */
11662         len = sizeof(struct sctp_stream_reset_add_strm);
11663         /* Fill it out. */
11664         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11665         addstr->ph.param_length = htons(len);
11666         addstr->request_seq = htonl(seq);
11667         addstr->number_of_streams = htons(adding);
11668         addstr->reserved = 0;
11669
11670         /* now fix the chunk length */
11671         ch->chunk_length = htons(len + old_len);
11672         chk->send_size = len + old_len;
11673         chk->book_size = SCTP_SIZE32(chk->send_size);
11674         chk->book_size_scale = 0;
11675         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11676         return;
11677 }
11678
11679 int
11680 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11681     int number_entries, uint16_t * list,
11682     uint8_t send_out_req,
11683     uint8_t send_in_req,
11684     uint8_t send_tsn_req,
11685     uint8_t add_stream,
11686     uint16_t adding_o,
11687     uint16_t adding_i, uint8_t peer_asked)
11688 {
11689
11690         struct sctp_association *asoc;
11691         struct sctp_tmit_chunk *chk;
11692         struct sctp_chunkhdr *ch;
11693         uint32_t seq;
11694
11695         asoc = &stcb->asoc;
11696         if (asoc->stream_reset_outstanding) {
11697                 /*-
11698                  * Already one pending, must get ACK back to clear the flag.
11699                  */
11700                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11701                 return (EBUSY);
11702         }
11703         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11704             (add_stream == 0)) {
11705                 /* nothing to do */
11706                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11707                 return (EINVAL);
11708         }
11709         if (send_tsn_req && (send_out_req || send_in_req)) {
11710                 /* error, can't do that */
11711                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11712                 return (EINVAL);
11713         }
11714         sctp_alloc_a_chunk(stcb, chk);
11715         if (chk == NULL) {
11716                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11717                 return (ENOMEM);
11718         }
11719         chk->copy_by_ref = 0;
11720         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11721         chk->rec.chunk_id.can_take_data = 0;
11722         chk->asoc = &stcb->asoc;
11723         chk->book_size = sizeof(struct sctp_chunkhdr);
11724         chk->send_size = SCTP_SIZE32(chk->book_size);
11725         chk->book_size_scale = 0;
11726
11727         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11728         if (chk->data == NULL) {
11729                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11730                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11731                 return (ENOMEM);
11732         }
11733         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11734
11735         /* setup chunk parameters */
11736         chk->sent = SCTP_DATAGRAM_UNSENT;
11737         chk->snd_count = 0;
11738         if (stcb->asoc.alternate) {
11739                 chk->whoTo = stcb->asoc.alternate;
11740         } else {
11741                 chk->whoTo = stcb->asoc.primary_destination;
11742         }
11743         atomic_add_int(&chk->whoTo->ref_count, 1);
11744         ch = mtod(chk->data, struct sctp_chunkhdr *);
11745         ch->chunk_type = SCTP_STREAM_RESET;
11746         ch->chunk_flags = 0;
11747         ch->chunk_length = htons(chk->book_size);
11748         SCTP_BUF_LEN(chk->data) = chk->send_size;
11749
11750         seq = stcb->asoc.str_reset_seq_out;
11751         if (send_out_req) {
11752                 sctp_add_stream_reset_out(chk, number_entries, list,
11753                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11754                 asoc->stream_reset_out_is_outstanding = 1;
11755                 seq++;
11756                 asoc->stream_reset_outstanding++;
11757         }
11758         if ((add_stream & 1) &&
11759             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11760                 /* Need to allocate more */
11761                 struct sctp_stream_out *oldstream;
11762                 struct sctp_stream_queue_pending *sp, *nsp;
11763                 int i;
11764
11765                 oldstream = stcb->asoc.strmout;
11766                 /* get some more */
11767                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11768                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11769                     SCTP_M_STRMO);
11770                 if (stcb->asoc.strmout == NULL) {
11771                         uint8_t x;
11772
11773                         stcb->asoc.strmout = oldstream;
11774                         /* Turn off the bit */
11775                         x = add_stream & 0xfe;
11776                         add_stream = x;
11777                         goto skip_stuff;
11778                 }
11779                 /*
11780                  * Ok now we proceed with copying the old out stuff and
11781                  * initializing the new stuff.
11782                  */
11783                 SCTP_TCB_SEND_LOCK(stcb);
11784                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11785                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11786                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11787                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11788                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11789                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11790                         stcb->asoc.strmout[i].stream_no = i;
11791                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11792                         /* now anything on those queues? */
11793                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11794                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11795                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11796                         }
11797                         /* Now move assoc pointers too */
11798                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11799                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11800                         }
11801                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11802                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11803                         }
11804                 }
11805                 /* now the new streams */
11806                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11807                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11808                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11809                         stcb->asoc.strmout[i].chunks_on_queues = 0;
11810                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
11811                         stcb->asoc.strmout[i].stream_no = i;
11812                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11813                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11814                 }
11815                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11816                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11817                 SCTP_TCB_SEND_UNLOCK(stcb);
11818         }
11819 skip_stuff:
11820         if ((add_stream & 1) && (adding_o > 0)) {
11821                 asoc->strm_pending_add_size = adding_o;
11822                 asoc->peer_req_out = peer_asked;
11823                 sctp_add_an_out_stream(chk, seq, adding_o);
11824                 seq++;
11825                 asoc->stream_reset_outstanding++;
11826         }
11827         if ((add_stream & 2) && (adding_i > 0)) {
11828                 sctp_add_an_in_stream(chk, seq, adding_i);
11829                 seq++;
11830                 asoc->stream_reset_outstanding++;
11831         }
11832         if (send_in_req) {
11833                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11834                 seq++;
11835                 asoc->stream_reset_outstanding++;
11836         }
11837         if (send_tsn_req) {
11838                 sctp_add_stream_reset_tsn(chk, seq);
11839                 asoc->stream_reset_outstanding++;
11840         }
11841         asoc->str_reset = chk;
11842         /* insert the chunk for sending */
11843         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11844             chk,
11845             sctp_next);
11846         asoc->ctrl_queue_cnt++;
11847         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11848         return (0);
11849 }
11850
11851 void
11852 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11853     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11854     uint8_t use_mflowid, uint32_t mflowid,
11855     uint32_t vrf_id, uint16_t port)
11856 {
11857         /* Don't respond to an ABORT with an ABORT. */
11858         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11859                 if (cause)
11860                         sctp_m_freem(cause);
11861                 return;
11862         }
11863         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11864             use_mflowid, mflowid,
11865             vrf_id, port);
11866         return;
11867 }
11868
11869 void
11870 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11871     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11872     uint8_t use_mflowid, uint32_t mflowid,
11873     uint32_t vrf_id, uint16_t port)
11874 {
11875         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11876             use_mflowid, mflowid,
11877             vrf_id, port);
11878         return;
11879 }
11880
11881 static struct mbuf *
11882 sctp_copy_resume(struct uio *uio,
11883     int max_send_len,
11884     int user_marks_eor,
11885     int *error,
11886     uint32_t * sndout,
11887     struct mbuf **new_tail)
11888 {
11889         struct mbuf *m;
11890
11891         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11892             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11893         if (m == NULL) {
11894                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11895                 *error = ENOMEM;
11896         } else {
11897                 *sndout = m_length(m, NULL);
11898                 *new_tail = m_last(m);
11899         }
11900         return (m);
11901 }
11902
11903 static int
11904 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11905     struct uio *uio,
11906     int resv_upfront)
11907 {
11908         int left;
11909
11910         left = sp->length;
11911         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11912             resv_upfront, 0);
11913         if (sp->data == NULL) {
11914                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11915                 return (ENOMEM);
11916         }
11917         sp->tail_mbuf = m_last(sp->data);
11918         return (0);
11919 }
11920
11921
11922
11923 static struct sctp_stream_queue_pending *
11924 sctp_copy_it_in(struct sctp_tcb *stcb,
11925     struct sctp_association *asoc,
11926     struct sctp_sndrcvinfo *srcv,
11927     struct uio *uio,
11928     struct sctp_nets *net,
11929     int max_send_len,
11930     int user_marks_eor,
11931     int *error)
11932 {
11933         /*-
11934          * This routine must be very careful in its work. Protocol
11935          * processing is up and running so care must be taken to spl...()
11936          * when you need to do something that may effect the stcb/asoc. The
11937          * sb is locked however. When data is copied the protocol processing
11938          * should be enabled since this is a slower operation...
11939          */
11940         struct sctp_stream_queue_pending *sp = NULL;
11941         int resv_in_first;
11942
11943         *error = 0;
11944         /* Now can we send this? */
11945         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11946             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11947             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11948             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11949                 /* got data while shutting down */
11950                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11951                 *error = ECONNRESET;
11952                 goto out_now;
11953         }
11954         sctp_alloc_a_strmoq(stcb, sp);
11955         if (sp == NULL) {
11956                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11957                 *error = ENOMEM;
11958                 goto out_now;
11959         }
11960         sp->act_flags = 0;
11961         sp->sender_all_done = 0;
11962         sp->sinfo_flags = srcv->sinfo_flags;
11963         sp->timetolive = srcv->sinfo_timetolive;
11964         sp->ppid = srcv->sinfo_ppid;
11965         sp->context = srcv->sinfo_context;
11966         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11967
11968         sp->stream = srcv->sinfo_stream;
11969         sp->length = min(uio->uio_resid, max_send_len);
11970         if ((sp->length == (uint32_t) uio->uio_resid) &&
11971             ((user_marks_eor == 0) ||
11972             (srcv->sinfo_flags & SCTP_EOF) ||
11973             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11974                 sp->msg_is_complete = 1;
11975         } else {
11976                 sp->msg_is_complete = 0;
11977         }
11978         sp->sender_all_done = 0;
11979         sp->some_taken = 0;
11980         sp->put_last_out = 0;
11981         resv_in_first = sizeof(struct sctp_data_chunk);
11982         sp->data = sp->tail_mbuf = NULL;
11983         if (sp->length == 0) {
11984                 *error = 0;
11985                 goto skip_copy;
11986         }
11987         if (srcv->sinfo_keynumber_valid) {
11988                 sp->auth_keyid = srcv->sinfo_keynumber;
11989         } else {
11990                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
11991         }
11992         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
11993                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
11994                 sp->holds_key_ref = 1;
11995         }
11996         *error = sctp_copy_one(sp, uio, resv_in_first);
11997 skip_copy:
11998         if (*error) {
11999                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12000                 sp = NULL;
12001         } else {
12002                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12003                         sp->net = net;
12004                         atomic_add_int(&sp->net->ref_count, 1);
12005                 } else {
12006                         sp->net = NULL;
12007                 }
12008                 sctp_set_prsctp_policy(sp);
12009         }
12010 out_now:
12011         return (sp);
12012 }
12013
12014
12015 int
12016 sctp_sosend(struct socket *so,
12017     struct sockaddr *addr,
12018     struct uio *uio,
12019     struct mbuf *top,
12020     struct mbuf *control,
12021     int flags,
12022     struct thread *p
12023 )
12024 {
12025         int error, use_sndinfo = 0;
12026         struct sctp_sndrcvinfo sndrcvninfo;
12027         struct sockaddr *addr_to_use;
12028
12029 #if defined(INET) && defined(INET6)
12030         struct sockaddr_in sin;
12031
12032 #endif
12033
12034         if (control) {
12035                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12036                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12037                     sizeof(sndrcvninfo))) {
12038                         /* got one */
12039                         use_sndinfo = 1;
12040                 }
12041         }
12042         addr_to_use = addr;
12043 #if defined(INET) && defined(INET6)
12044         if ((addr) && (addr->sa_family == AF_INET6)) {
12045                 struct sockaddr_in6 *sin6;
12046
12047                 sin6 = (struct sockaddr_in6 *)addr;
12048                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12049                         in6_sin6_2_sin(&sin, sin6);
12050                         addr_to_use = (struct sockaddr *)&sin;
12051                 }
12052         }
12053 #endif
12054         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12055             control,
12056             flags,
12057             use_sndinfo ? &sndrcvninfo : NULL
12058             ,p
12059             );
12060         return (error);
12061 }
12062
12063
12064 int
12065 sctp_lower_sosend(struct socket *so,
12066     struct sockaddr *addr,
12067     struct uio *uio,
12068     struct mbuf *i_pak,
12069     struct mbuf *control,
12070     int flags,
12071     struct sctp_sndrcvinfo *srcv
12072     ,
12073     struct thread *p
12074 )
12075 {
12076         unsigned int sndlen = 0, max_len;
12077         int error, len;
12078         struct mbuf *top = NULL;
12079         int queue_only = 0, queue_only_for_init = 0;
12080         int free_cnt_applied = 0;
12081         int un_sent;
12082         int now_filled = 0;
12083         unsigned int inqueue_bytes = 0;
12084         struct sctp_block_entry be;
12085         struct sctp_inpcb *inp;
12086         struct sctp_tcb *stcb = NULL;
12087         struct timeval now;
12088         struct sctp_nets *net;
12089         struct sctp_association *asoc;
12090         struct sctp_inpcb *t_inp;
12091         int user_marks_eor;
12092         int create_lock_applied = 0;
12093         int nagle_applies = 0;
12094         int some_on_control = 0;
12095         int got_all_of_the_send = 0;
12096         int hold_tcblock = 0;
12097         int non_blocking = 0;
12098         uint32_t local_add_more, local_soresv = 0;
12099         uint16_t port;
12100         uint16_t sinfo_flags;
12101         sctp_assoc_t sinfo_assoc_id;
12102
12103         error = 0;
12104         net = NULL;
12105         stcb = NULL;
12106         asoc = NULL;
12107
12108         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12109         if (inp == NULL) {
12110                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12111                 error = EINVAL;
12112                 if (i_pak) {
12113                         SCTP_RELEASE_PKT(i_pak);
12114                 }
12115                 return (error);
12116         }
12117         if ((uio == NULL) && (i_pak == NULL)) {
12118                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12119                 return (EINVAL);
12120         }
12121         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12122         atomic_add_int(&inp->total_sends, 1);
12123         if (uio) {
12124                 if (uio->uio_resid < 0) {
12125                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12126                         return (EINVAL);
12127                 }
12128                 sndlen = uio->uio_resid;
12129         } else {
12130                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12131                 sndlen = SCTP_HEADER_LEN(i_pak);
12132         }
12133         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12134             (void *)addr,
12135             sndlen);
12136         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12137             (inp->sctp_socket->so_qlimit)) {
12138                 /* The listener can NOT send */
12139                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12140                 error = ENOTCONN;
12141                 goto out_unlocked;
12142         }
12143         /**
12144          * Pre-screen address, if one is given the sin-len
12145          * must be set correctly!
12146          */
12147         if (addr) {
12148                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12149
12150                 switch (raddr->sa.sa_family) {
12151 #ifdef INET
12152                 case AF_INET:
12153                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12154                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12155                                 error = EINVAL;
12156                                 goto out_unlocked;
12157                         }
12158                         port = raddr->sin.sin_port;
12159                         break;
12160 #endif
12161 #ifdef INET6
12162                 case AF_INET6:
12163                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12164                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12165                                 error = EINVAL;
12166                                 goto out_unlocked;
12167                         }
12168                         port = raddr->sin6.sin6_port;
12169                         break;
12170 #endif
12171                 default:
12172                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12173                         error = EAFNOSUPPORT;
12174                         goto out_unlocked;
12175                 }
12176         } else
12177                 port = 0;
12178
12179         if (srcv) {
12180                 sinfo_flags = srcv->sinfo_flags;
12181                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12182                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12183                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12184                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12185                         error = EINVAL;
12186                         goto out_unlocked;
12187                 }
12188                 if (srcv->sinfo_flags)
12189                         SCTP_STAT_INCR(sctps_sends_with_flags);
12190         } else {
12191                 sinfo_flags = inp->def_send.sinfo_flags;
12192                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12193         }
12194         if (sinfo_flags & SCTP_SENDALL) {
12195                 /* its a sendall */
12196                 error = sctp_sendall(inp, uio, top, srcv);
12197                 top = NULL;
12198                 goto out_unlocked;
12199         }
12200         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12201                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12202                 error = EINVAL;
12203                 goto out_unlocked;
12204         }
12205         /* now we must find the assoc */
12206         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12207             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12208                 SCTP_INP_RLOCK(inp);
12209                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12210                 if (stcb) {
12211                         SCTP_TCB_LOCK(stcb);
12212                         hold_tcblock = 1;
12213                 }
12214                 SCTP_INP_RUNLOCK(inp);
12215         } else if (sinfo_assoc_id) {
12216                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12217         } else if (addr) {
12218                 /*-
12219                  * Since we did not use findep we must
12220                  * increment it, and if we don't find a tcb
12221                  * decrement it.
12222                  */
12223                 SCTP_INP_WLOCK(inp);
12224                 SCTP_INP_INCR_REF(inp);
12225                 SCTP_INP_WUNLOCK(inp);
12226                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12227                 if (stcb == NULL) {
12228                         SCTP_INP_WLOCK(inp);
12229                         SCTP_INP_DECR_REF(inp);
12230                         SCTP_INP_WUNLOCK(inp);
12231                 } else {
12232                         hold_tcblock = 1;
12233                 }
12234         }
12235         if ((stcb == NULL) && (addr)) {
12236                 /* Possible implicit send? */
12237                 SCTP_ASOC_CREATE_LOCK(inp);
12238                 create_lock_applied = 1;
12239                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12240                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12241                         /* Should I really unlock ? */
12242                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12243                         error = EINVAL;
12244                         goto out_unlocked;
12245
12246                 }
12247                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12248                     (addr->sa_family == AF_INET6)) {
12249                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12250                         error = EINVAL;
12251                         goto out_unlocked;
12252                 }
12253                 SCTP_INP_WLOCK(inp);
12254                 SCTP_INP_INCR_REF(inp);
12255                 SCTP_INP_WUNLOCK(inp);
12256                 /* With the lock applied look again */
12257                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12258                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12259                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12260                 }
12261                 if (stcb == NULL) {
12262                         SCTP_INP_WLOCK(inp);
12263                         SCTP_INP_DECR_REF(inp);
12264                         SCTP_INP_WUNLOCK(inp);
12265                 } else {
12266                         hold_tcblock = 1;
12267                 }
12268                 if (error) {
12269                         goto out_unlocked;
12270                 }
12271                 if (t_inp != inp) {
12272                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12273                         error = ENOTCONN;
12274                         goto out_unlocked;
12275                 }
12276         }
12277         if (stcb == NULL) {
12278                 if (addr == NULL) {
12279                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12280                         error = ENOENT;
12281                         goto out_unlocked;
12282                 } else {
12283                         /* We must go ahead and start the INIT process */
12284                         uint32_t vrf_id;
12285
12286                         if ((sinfo_flags & SCTP_ABORT) ||
12287                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12288                                 /*-
12289                                  * User asks to abort a non-existant assoc,
12290                                  * or EOF a non-existant assoc with no data
12291                                  */
12292                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12293                                 error = ENOENT;
12294                                 goto out_unlocked;
12295                         }
12296                         /* get an asoc/stcb struct */
12297                         vrf_id = inp->def_vrf_id;
12298 #ifdef INVARIANTS
12299                         if (create_lock_applied == 0) {
12300                                 panic("Error, should hold create lock and I don't?");
12301                         }
12302 #endif
12303                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12304                             p
12305                             );
12306                         if (stcb == NULL) {
12307                                 /* Error is setup for us in the call */
12308                                 goto out_unlocked;
12309                         }
12310                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12311                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12312                                 /*
12313                                  * Set the connected flag so we can queue
12314                                  * data
12315                                  */
12316                                 soisconnecting(so);
12317                         }
12318                         hold_tcblock = 1;
12319                         if (create_lock_applied) {
12320                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12321                                 create_lock_applied = 0;
12322                         } else {
12323                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12324                         }
12325                         /*
12326                          * Turn on queue only flag to prevent data from
12327                          * being sent
12328                          */
12329                         queue_only = 1;
12330                         asoc = &stcb->asoc;
12331                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12332                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12333
12334                         /* initialize authentication params for the assoc */
12335                         sctp_initialize_auth_params(inp, stcb);
12336
12337                         if (control) {
12338                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12339                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12340                                         hold_tcblock = 0;
12341                                         stcb = NULL;
12342                                         goto out_unlocked;
12343                                 }
12344                         }
12345                         /* out with the INIT */
12346                         queue_only_for_init = 1;
12347                         /*-
12348                          * we may want to dig in after this call and adjust the MTU
12349                          * value. It defaulted to 1500 (constant) but the ro
12350                          * structure may now have an update and thus we may need to
12351                          * change it BEFORE we append the message.
12352                          */
12353                 }
12354         } else
12355                 asoc = &stcb->asoc;
12356         if (srcv == NULL)
12357                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12358         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12359                 if (addr)
12360                         net = sctp_findnet(stcb, addr);
12361                 else
12362                         net = NULL;
12363                 if ((net == NULL) ||
12364                     ((port != 0) && (port != stcb->rport))) {
12365                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12366                         error = EINVAL;
12367                         goto out_unlocked;
12368                 }
12369         } else {
12370                 if (stcb->asoc.alternate) {
12371                         net = stcb->asoc.alternate;
12372                 } else {
12373                         net = stcb->asoc.primary_destination;
12374                 }
12375         }
12376         atomic_add_int(&stcb->total_sends, 1);
12377         /* Keep the stcb from being freed under our feet */
12378         atomic_add_int(&asoc->refcnt, 1);
12379         free_cnt_applied = 1;
12380
12381         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12382                 if (sndlen > asoc->smallest_mtu) {
12383                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12384                         error = EMSGSIZE;
12385                         goto out_unlocked;
12386                 }
12387         }
12388         if (SCTP_SO_IS_NBIO(so)
12389             || (flags & MSG_NBIO)
12390             ) {
12391                 non_blocking = 1;
12392         }
12393         /* would we block? */
12394         if (non_blocking) {
12395                 if (hold_tcblock == 0) {
12396                         SCTP_TCB_LOCK(stcb);
12397                         hold_tcblock = 1;
12398                 }
12399                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12400                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12401                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12402                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12403                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12404                                 error = EMSGSIZE;
12405                         else
12406                                 error = EWOULDBLOCK;
12407                         goto out_unlocked;
12408                 }
12409                 stcb->asoc.sb_send_resv += sndlen;
12410                 SCTP_TCB_UNLOCK(stcb);
12411                 hold_tcblock = 0;
12412         } else {
12413                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12414         }
12415         local_soresv = sndlen;
12416         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12417                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12418                 error = ECONNRESET;
12419                 goto out_unlocked;
12420         }
12421         if (create_lock_applied) {
12422                 SCTP_ASOC_CREATE_UNLOCK(inp);
12423                 create_lock_applied = 0;
12424         }
12425         if (asoc->stream_reset_outstanding) {
12426                 /*
12427                  * Can't queue any data while stream reset is underway.
12428                  */
12429                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12430                 error = EAGAIN;
12431                 goto out_unlocked;
12432         }
12433         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12434             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12435                 queue_only = 1;
12436         }
12437         /* we are now done with all control */
12438         if (control) {
12439                 sctp_m_freem(control);
12440                 control = NULL;
12441         }
12442         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12443             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12444             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12445             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12446                 if (srcv->sinfo_flags & SCTP_ABORT) {
12447                         ;
12448                 } else {
12449                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12450                         error = ECONNRESET;
12451                         goto out_unlocked;
12452                 }
12453         }
12454         /* Ok, we will attempt a msgsnd :> */
12455         if (p) {
12456                 p->td_ru.ru_msgsnd++;
12457         }
12458         /* Are we aborting? */
12459         if (srcv->sinfo_flags & SCTP_ABORT) {
12460                 struct mbuf *mm;
12461                 int tot_demand, tot_out = 0, max_out;
12462
12463                 SCTP_STAT_INCR(sctps_sends_with_abort);
12464                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12465                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12466                         /* It has to be up before we abort */
12467                         /* how big is the user initiated abort? */
12468                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12469                         error = EINVAL;
12470                         goto out;
12471                 }
12472                 if (hold_tcblock) {
12473                         SCTP_TCB_UNLOCK(stcb);
12474                         hold_tcblock = 0;
12475                 }
12476                 if (top) {
12477                         struct mbuf *cntm = NULL;
12478
12479                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12480                         if (sndlen != 0) {
12481                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12482                                         tot_out += SCTP_BUF_LEN(cntm);
12483                                 }
12484                         }
12485                 } else {
12486                         /* Must fit in a MTU */
12487                         tot_out = sndlen;
12488                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12489                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12490                                 /* To big */
12491                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12492                                 error = EMSGSIZE;
12493                                 goto out;
12494                         }
12495                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12496                 }
12497                 if (mm == NULL) {
12498                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12499                         error = ENOMEM;
12500                         goto out;
12501                 }
12502                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12503                 max_out -= sizeof(struct sctp_abort_msg);
12504                 if (tot_out > max_out) {
12505                         tot_out = max_out;
12506                 }
12507                 if (mm) {
12508                         struct sctp_paramhdr *ph;
12509
12510                         /* now move forward the data pointer */
12511                         ph = mtod(mm, struct sctp_paramhdr *);
12512                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12513                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12514                         ph++;
12515                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12516                         if (top == NULL) {
12517                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12518                                 if (error) {
12519                                         /*-
12520                                          * Here if we can't get his data we
12521                                          * still abort we just don't get to
12522                                          * send the users note :-0
12523                                          */
12524                                         sctp_m_freem(mm);
12525                                         mm = NULL;
12526                                 }
12527                         } else {
12528                                 if (sndlen != 0) {
12529                                         SCTP_BUF_NEXT(mm) = top;
12530                                 }
12531                         }
12532                 }
12533                 if (hold_tcblock == 0) {
12534                         SCTP_TCB_LOCK(stcb);
12535                 }
12536                 atomic_add_int(&stcb->asoc.refcnt, -1);
12537                 free_cnt_applied = 0;
12538                 /* release this lock, otherwise we hang on ourselves */
12539                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12540                 /* now relock the stcb so everything is sane */
12541                 hold_tcblock = 0;
12542                 stcb = NULL;
12543                 /*
12544                  * In this case top is already chained to mm avoid double
12545                  * free, since we free it below if top != NULL and driver
12546                  * would free it after sending the packet out
12547                  */
12548                 if (sndlen != 0) {
12549                         top = NULL;
12550                 }
12551                 goto out_unlocked;
12552         }
12553         /* Calculate the maximum we can send */
12554         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12555         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12556                 if (non_blocking) {
12557                         /* we already checked for non-blocking above. */
12558                         max_len = sndlen;
12559                 } else {
12560                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12561                 }
12562         } else {
12563                 max_len = 0;
12564         }
12565         if (hold_tcblock) {
12566                 SCTP_TCB_UNLOCK(stcb);
12567                 hold_tcblock = 0;
12568         }
12569         /* Is the stream no. valid? */
12570         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12571                 /* Invalid stream number */
12572                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12573                 error = EINVAL;
12574                 goto out_unlocked;
12575         }
12576         if (asoc->strmout == NULL) {
12577                 /* huh? software error */
12578                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12579                 error = EFAULT;
12580                 goto out_unlocked;
12581         }
12582         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12583         if ((user_marks_eor == 0) &&
12584             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12585                 /* It will NEVER fit */
12586                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12587                 error = EMSGSIZE;
12588                 goto out_unlocked;
12589         }
12590         if ((uio == NULL) && user_marks_eor) {
12591                 /*-
12592                  * We do not support eeor mode for
12593                  * sending with mbuf chains (like sendfile).
12594                  */
12595                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12596                 error = EINVAL;
12597                 goto out_unlocked;
12598         }
12599         if (user_marks_eor) {
12600                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12601         } else {
12602                 /*-
12603                  * For non-eeor the whole message must fit in
12604                  * the socket send buffer.
12605                  */
12606                 local_add_more = sndlen;
12607         }
12608         len = 0;
12609         if (non_blocking) {
12610                 goto skip_preblock;
12611         }
12612         if (((max_len <= local_add_more) &&
12613             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12614             (max_len == 0) ||
12615             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12616                 /* No room right now ! */
12617                 SOCKBUF_LOCK(&so->so_snd);
12618                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12619                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12620                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12621                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12622                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12623                             inqueue_bytes,
12624                             local_add_more,
12625                             stcb->asoc.stream_queue_cnt,
12626                             stcb->asoc.chunks_on_out_queue,
12627                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12628                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12629                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12630                         }
12631                         be.error = 0;
12632                         stcb->block_entry = &be;
12633                         error = sbwait(&so->so_snd);
12634                         stcb->block_entry = NULL;
12635                         if (error || so->so_error || be.error) {
12636                                 if (error == 0) {
12637                                         if (so->so_error)
12638                                                 error = so->so_error;
12639                                         if (be.error) {
12640                                                 error = be.error;
12641                                         }
12642                                 }
12643                                 SOCKBUF_UNLOCK(&so->so_snd);
12644                                 goto out_unlocked;
12645                         }
12646                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12647                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12648                                     asoc, stcb->asoc.total_output_queue_size);
12649                         }
12650                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12651                                 goto out_unlocked;
12652                         }
12653                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12654                 }
12655                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12656                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12657                 } else {
12658                         max_len = 0;
12659                 }
12660                 SOCKBUF_UNLOCK(&so->so_snd);
12661         }
12662 skip_preblock:
12663         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12664                 goto out_unlocked;
12665         }
12666         /*
12667          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12668          * case NOTE: uio will be null when top/mbuf is passed
12669          */
12670         if (sndlen == 0) {
12671                 if (srcv->sinfo_flags & SCTP_EOF) {
12672                         got_all_of_the_send = 1;
12673                         goto dataless_eof;
12674                 } else {
12675                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12676                         error = EINVAL;
12677                         goto out;
12678                 }
12679         }
12680         if (top == NULL) {
12681                 struct sctp_stream_queue_pending *sp;
12682                 struct sctp_stream_out *strm;
12683                 uint32_t sndout;
12684
12685                 SCTP_TCB_SEND_LOCK(stcb);
12686                 if ((asoc->stream_locked) &&
12687                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12688                         SCTP_TCB_SEND_UNLOCK(stcb);
12689                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12690                         error = EINVAL;
12691                         goto out;
12692                 }
12693                 SCTP_TCB_SEND_UNLOCK(stcb);
12694
12695                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12696                 if (strm->last_msg_incomplete == 0) {
12697         do_a_copy_in:
12698                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12699                         if ((sp == NULL) || (error)) {
12700                                 goto out;
12701                         }
12702                         SCTP_TCB_SEND_LOCK(stcb);
12703                         if (sp->msg_is_complete) {
12704                                 strm->last_msg_incomplete = 0;
12705                                 asoc->stream_locked = 0;
12706                         } else {
12707                                 /*
12708                                  * Just got locked to this guy in case of an
12709                                  * interrupt.
12710                                  */
12711                                 strm->last_msg_incomplete = 1;
12712                                 asoc->stream_locked = 1;
12713                                 asoc->stream_locked_on = srcv->sinfo_stream;
12714                                 sp->sender_all_done = 0;
12715                         }
12716                         sctp_snd_sb_alloc(stcb, sp->length);
12717                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12718                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
12719                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12720                         }
12721                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12722                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12723                         SCTP_TCB_SEND_UNLOCK(stcb);
12724                 } else {
12725                         SCTP_TCB_SEND_LOCK(stcb);
12726                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12727                         SCTP_TCB_SEND_UNLOCK(stcb);
12728                         if (sp == NULL) {
12729                                 /* ???? Huh ??? last msg is gone */
12730 #ifdef INVARIANTS
12731                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12732 #else
12733                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12734                                 strm->last_msg_incomplete = 0;
12735 #endif
12736                                 goto do_a_copy_in;
12737
12738                         }
12739                 }
12740                 while (uio->uio_resid > 0) {
12741                         /* How much room do we have? */
12742                         struct mbuf *new_tail, *mm;
12743
12744                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12745                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12746                         else
12747                                 max_len = 0;
12748
12749                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12750                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12751                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12752                                 sndout = 0;
12753                                 new_tail = NULL;
12754                                 if (hold_tcblock) {
12755                                         SCTP_TCB_UNLOCK(stcb);
12756                                         hold_tcblock = 0;
12757                                 }
12758                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12759                                 if ((mm == NULL) || error) {
12760                                         if (mm) {
12761                                                 sctp_m_freem(mm);
12762                                         }
12763                                         goto out;
12764                                 }
12765                                 /* Update the mbuf and count */
12766                                 SCTP_TCB_SEND_LOCK(stcb);
12767                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12768                                         /*
12769                                          * we need to get out. Peer probably
12770                                          * aborted.
12771                                          */
12772                                         sctp_m_freem(mm);
12773                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12774                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12775                                                 error = ECONNRESET;
12776                                         }
12777                                         SCTP_TCB_SEND_UNLOCK(stcb);
12778                                         goto out;
12779                                 }
12780                                 if (sp->tail_mbuf) {
12781                                         /* tack it to the end */
12782                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12783                                         sp->tail_mbuf = new_tail;
12784                                 } else {
12785                                         /* A stolen mbuf */
12786                                         sp->data = mm;
12787                                         sp->tail_mbuf = new_tail;
12788                                 }
12789                                 sctp_snd_sb_alloc(stcb, sndout);
12790                                 atomic_add_int(&sp->length, sndout);
12791                                 len += sndout;
12792
12793                                 /* Did we reach EOR? */
12794                                 if ((uio->uio_resid == 0) &&
12795                                     ((user_marks_eor == 0) ||
12796                                     (srcv->sinfo_flags & SCTP_EOF) ||
12797                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12798                                         sp->msg_is_complete = 1;
12799                                 } else {
12800                                         sp->msg_is_complete = 0;
12801                                 }
12802                                 SCTP_TCB_SEND_UNLOCK(stcb);
12803                         }
12804                         if (uio->uio_resid == 0) {
12805                                 /* got it all? */
12806                                 continue;
12807                         }
12808                         /* PR-SCTP? */
12809                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12810                                 /*
12811                                  * This is ugly but we must assure locking
12812                                  * order
12813                                  */
12814                                 if (hold_tcblock == 0) {
12815                                         SCTP_TCB_LOCK(stcb);
12816                                         hold_tcblock = 1;
12817                                 }
12818                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12819                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12820                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12821                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12822                                 else
12823                                         max_len = 0;
12824                                 if (max_len > 0) {
12825                                         continue;
12826                                 }
12827                                 SCTP_TCB_UNLOCK(stcb);
12828                                 hold_tcblock = 0;
12829                         }
12830                         /* wait for space now */
12831                         if (non_blocking) {
12832                                 /* Non-blocking io in place out */
12833                                 goto skip_out_eof;
12834                         }
12835                         /* What about the INIT, send it maybe */
12836                         if (queue_only_for_init) {
12837                                 if (hold_tcblock == 0) {
12838                                         SCTP_TCB_LOCK(stcb);
12839                                         hold_tcblock = 1;
12840                                 }
12841                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12842                                         /* a collision took us forward? */
12843                                         queue_only = 0;
12844                                 } else {
12845                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12846                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12847                                         queue_only = 1;
12848                                 }
12849                         }
12850                         if ((net->flight_size > net->cwnd) &&
12851                             (asoc->sctp_cmt_on_off == 0)) {
12852                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12853                                 queue_only = 1;
12854                         } else if (asoc->ifp_had_enobuf) {
12855                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12856                                 if (net->flight_size > (2 * net->mtu)) {
12857                                         queue_only = 1;
12858                                 }
12859                                 asoc->ifp_had_enobuf = 0;
12860                         }
12861                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12862                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12863                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12864                             (stcb->asoc.total_flight > 0) &&
12865                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12866                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12867
12868                                 /*-
12869                                  * Ok, Nagle is set on and we have data outstanding.
12870                                  * Don't send anything and let SACKs drive out the
12871                                  * data unless wen have a "full" segment to send.
12872                                  */
12873                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12874                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12875                                 }
12876                                 SCTP_STAT_INCR(sctps_naglequeued);
12877                                 nagle_applies = 1;
12878                         } else {
12879                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12880                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12881                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12882                                 }
12883                                 SCTP_STAT_INCR(sctps_naglesent);
12884                                 nagle_applies = 0;
12885                         }
12886                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12887
12888                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12889                                     nagle_applies, un_sent);
12890                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12891                                     stcb->asoc.total_flight,
12892                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12893                         }
12894                         if (queue_only_for_init)
12895                                 queue_only_for_init = 0;
12896                         if ((queue_only == 0) && (nagle_applies == 0)) {
12897                                 /*-
12898                                  * need to start chunk output
12899                                  * before blocking.. note that if
12900                                  * a lock is already applied, then
12901                                  * the input via the net is happening
12902                                  * and I don't need to start output :-D
12903                                  */
12904                                 if (hold_tcblock == 0) {
12905                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12906                                                 hold_tcblock = 1;
12907                                                 sctp_chunk_output(inp,
12908                                                     stcb,
12909                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12910                                         }
12911                                 } else {
12912                                         sctp_chunk_output(inp,
12913                                             stcb,
12914                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12915                                 }
12916                                 if (hold_tcblock == 1) {
12917                                         SCTP_TCB_UNLOCK(stcb);
12918                                         hold_tcblock = 0;
12919                                 }
12920                         }
12921                         SOCKBUF_LOCK(&so->so_snd);
12922                         /*-
12923                          * This is a bit strange, but I think it will
12924                          * work. The total_output_queue_size is locked and
12925                          * protected by the TCB_LOCK, which we just released.
12926                          * There is a race that can occur between releasing it
12927                          * above, and me getting the socket lock, where sacks
12928                          * come in but we have not put the SB_WAIT on the
12929                          * so_snd buffer to get the wakeup. After the LOCK
12930                          * is applied the sack_processing will also need to
12931                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12932                          * once we have the socket buffer lock if we recheck the
12933                          * size we KNOW we will get to sleep safely with the
12934                          * wakeup flag in place.
12935                          */
12936                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12937                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
12938                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12939                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12940                                             asoc, uio->uio_resid);
12941                                 }
12942                                 be.error = 0;
12943                                 stcb->block_entry = &be;
12944                                 error = sbwait(&so->so_snd);
12945                                 stcb->block_entry = NULL;
12946
12947                                 if (error || so->so_error || be.error) {
12948                                         if (error == 0) {
12949                                                 if (so->so_error)
12950                                                         error = so->so_error;
12951                                                 if (be.error) {
12952                                                         error = be.error;
12953                                                 }
12954                                         }
12955                                         SOCKBUF_UNLOCK(&so->so_snd);
12956                                         goto out_unlocked;
12957                                 }
12958                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12959                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12960                                             asoc, stcb->asoc.total_output_queue_size);
12961                                 }
12962                         }
12963                         SOCKBUF_UNLOCK(&so->so_snd);
12964                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12965                                 goto out_unlocked;
12966                         }
12967                 }
12968                 SCTP_TCB_SEND_LOCK(stcb);
12969                 if (sp) {
12970                         if (sp->msg_is_complete == 0) {
12971                                 strm->last_msg_incomplete = 1;
12972                                 asoc->stream_locked = 1;
12973                                 asoc->stream_locked_on = srcv->sinfo_stream;
12974                         } else {
12975                                 sp->sender_all_done = 1;
12976                                 strm->last_msg_incomplete = 0;
12977                                 asoc->stream_locked = 0;
12978                         }
12979                 } else {
12980                         SCTP_PRINTF("Huh no sp TSNH?\n");
12981                         strm->last_msg_incomplete = 0;
12982                         asoc->stream_locked = 0;
12983                 }
12984                 SCTP_TCB_SEND_UNLOCK(stcb);
12985                 if (uio->uio_resid == 0) {
12986                         got_all_of_the_send = 1;
12987                 }
12988         } else {
12989                 /* We send in a 0, since we do NOT have any locks */
12990                 error = sctp_msg_append(stcb, net, top, srcv, 0);
12991                 top = NULL;
12992                 if (srcv->sinfo_flags & SCTP_EOF) {
12993                         /*
12994                          * This should only happen for Panda for the mbuf
12995                          * send case, which does NOT yet support EEOR mode.
12996                          * Thus, we can just set this flag to do the proper
12997                          * EOF handling.
12998                          */
12999                         got_all_of_the_send = 1;
13000                 }
13001         }
13002         if (error) {
13003                 goto out;
13004         }
13005 dataless_eof:
13006         /* EOF thing ? */
13007         if ((srcv->sinfo_flags & SCTP_EOF) &&
13008             (got_all_of_the_send == 1)) {
13009                 int cnt;
13010
13011                 SCTP_STAT_INCR(sctps_sends_with_eof);
13012                 error = 0;
13013                 if (hold_tcblock == 0) {
13014                         SCTP_TCB_LOCK(stcb);
13015                         hold_tcblock = 1;
13016                 }
13017                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13018                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13019                     TAILQ_EMPTY(&asoc->sent_queue) &&
13020                     (cnt == 0)) {
13021                         if (asoc->locked_on_sending) {
13022                                 goto abort_anyway;
13023                         }
13024                         /* there is nothing queued to send, so I'm done... */
13025                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13026                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13027                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13028                                 struct sctp_nets *netp;
13029
13030                                 /* only send SHUTDOWN the first time through */
13031                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13032                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13033                                 }
13034                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13035                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13036                                 sctp_stop_timers_for_shutdown(stcb);
13037                                 if (stcb->asoc.alternate) {
13038                                         netp = stcb->asoc.alternate;
13039                                 } else {
13040                                         netp = stcb->asoc.primary_destination;
13041                                 }
13042                                 sctp_send_shutdown(stcb, netp);
13043                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13044                                     netp);
13045                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13046                                     asoc->primary_destination);
13047                         }
13048                 } else {
13049                         /*-
13050                          * we still got (or just got) data to send, so set
13051                          * SHUTDOWN_PENDING
13052                          */
13053                         /*-
13054                          * XXX sockets draft says that SCTP_EOF should be
13055                          * sent with no data.  currently, we will allow user
13056                          * data to be sent first and move to
13057                          * SHUTDOWN-PENDING
13058                          */
13059                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13060                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13061                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13062                                 if (hold_tcblock == 0) {
13063                                         SCTP_TCB_LOCK(stcb);
13064                                         hold_tcblock = 1;
13065                                 }
13066                                 if (asoc->locked_on_sending) {
13067                                         /* Locked to send out the data */
13068                                         struct sctp_stream_queue_pending *sp;
13069
13070                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13071                                         if (sp) {
13072                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13073                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13074                                         }
13075                                 }
13076                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13077                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13078                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13079                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13080                         abort_anyway:
13081                                         if (free_cnt_applied) {
13082                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13083                                                 free_cnt_applied = 0;
13084                                         }
13085                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13086                                             NULL, SCTP_SO_LOCKED);
13087                                         /*
13088                                          * now relock the stcb so everything
13089                                          * is sane
13090                                          */
13091                                         hold_tcblock = 0;
13092                                         stcb = NULL;
13093                                         goto out;
13094                                 }
13095                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13096                                     asoc->primary_destination);
13097                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13098                         }
13099                 }
13100         }
13101 skip_out_eof:
13102         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13103                 some_on_control = 1;
13104         }
13105         if (queue_only_for_init) {
13106                 if (hold_tcblock == 0) {
13107                         SCTP_TCB_LOCK(stcb);
13108                         hold_tcblock = 1;
13109                 }
13110                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13111                         /* a collision took us forward? */
13112                         queue_only = 0;
13113                 } else {
13114                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13115                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13116                         queue_only = 1;
13117                 }
13118         }
13119         if ((net->flight_size > net->cwnd) &&
13120             (stcb->asoc.sctp_cmt_on_off == 0)) {
13121                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13122                 queue_only = 1;
13123         } else if (asoc->ifp_had_enobuf) {
13124                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13125                 if (net->flight_size > (2 * net->mtu)) {
13126                         queue_only = 1;
13127                 }
13128                 asoc->ifp_had_enobuf = 0;
13129         }
13130         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13131             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13132         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13133             (stcb->asoc.total_flight > 0) &&
13134             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13135             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13136                 /*-
13137                  * Ok, Nagle is set on and we have data outstanding.
13138                  * Don't send anything and let SACKs drive out the
13139                  * data unless wen have a "full" segment to send.
13140                  */
13141                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13142                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13143                 }
13144                 SCTP_STAT_INCR(sctps_naglequeued);
13145                 nagle_applies = 1;
13146         } else {
13147                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13148                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13149                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13150                 }
13151                 SCTP_STAT_INCR(sctps_naglesent);
13152                 nagle_applies = 0;
13153         }
13154         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13155                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13156                     nagle_applies, un_sent);
13157                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13158                     stcb->asoc.total_flight,
13159                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13160         }
13161         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13162                 /* we can attempt to send too. */
13163                 if (hold_tcblock == 0) {
13164                         /*
13165                          * If there is activity recv'ing sacks no need to
13166                          * send
13167                          */
13168                         if (SCTP_TCB_TRYLOCK(stcb)) {
13169                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13170                                 hold_tcblock = 1;
13171                         }
13172                 } else {
13173                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13174                 }
13175         } else if ((queue_only == 0) &&
13176                     (stcb->asoc.peers_rwnd == 0) &&
13177             (stcb->asoc.total_flight == 0)) {
13178                 /* We get to have a probe outstanding */
13179                 if (hold_tcblock == 0) {
13180                         hold_tcblock = 1;
13181                         SCTP_TCB_LOCK(stcb);
13182                 }
13183                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13184         } else if (some_on_control) {
13185                 int num_out, reason, frag_point;
13186
13187                 /* Here we do control only */
13188                 if (hold_tcblock == 0) {
13189                         hold_tcblock = 1;
13190                         SCTP_TCB_LOCK(stcb);
13191                 }
13192                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13193                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13194                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13195         }
13196         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13197             queue_only, stcb->asoc.peers_rwnd, un_sent,
13198             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13199             stcb->asoc.total_output_queue_size, error);
13200
13201 out:
13202 out_unlocked:
13203
13204         if (local_soresv && stcb) {
13205                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13206         }
13207         if (create_lock_applied) {
13208                 SCTP_ASOC_CREATE_UNLOCK(inp);
13209         }
13210         if ((stcb) && hold_tcblock) {
13211                 SCTP_TCB_UNLOCK(stcb);
13212         }
13213         if (stcb && free_cnt_applied) {
13214                 atomic_add_int(&stcb->asoc.refcnt, -1);
13215         }
13216 #ifdef INVARIANTS
13217         if (stcb) {
13218                 if (mtx_owned(&stcb->tcb_mtx)) {
13219                         panic("Leaving with tcb mtx owned?");
13220                 }
13221                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13222                         panic("Leaving with tcb send mtx owned?");
13223                 }
13224         }
13225 #endif
13226 #ifdef INVARIANTS
13227         if (inp) {
13228                 sctp_validate_no_locks(inp);
13229         } else {
13230                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13231         }
13232 #endif
13233         if (top) {
13234                 sctp_m_freem(top);
13235         }
13236         if (control) {
13237                 sctp_m_freem(control);
13238         }
13239         return (error);
13240 }
13241
13242
13243 /*
13244  * generate an AUTHentication chunk, if required
13245  */
13246 struct mbuf *
13247 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13248     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13249     struct sctp_tcb *stcb, uint8_t chunk)
13250 {
13251         struct mbuf *m_auth;
13252         struct sctp_auth_chunk *auth;
13253         int chunk_len;
13254         struct mbuf *cn;
13255
13256         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13257             (stcb == NULL))
13258                 return (m);
13259
13260         /* sysctl disabled auth? */
13261         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13262                 return (m);
13263
13264         /* peer doesn't do auth... */
13265         if (!stcb->asoc.peer_supports_auth) {
13266                 return (m);
13267         }
13268         /* does the requested chunk require auth? */
13269         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13270                 return (m);
13271         }
13272         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13273         if (m_auth == NULL) {
13274                 /* no mbuf's */
13275                 return (m);
13276         }
13277         /* reserve some space if this will be the first mbuf */
13278         if (m == NULL)
13279                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13280         /* fill in the AUTH chunk details */
13281         auth = mtod(m_auth, struct sctp_auth_chunk *);
13282         bzero(auth, sizeof(*auth));
13283         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13284         auth->ch.chunk_flags = 0;
13285         chunk_len = sizeof(*auth) +
13286             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13287         auth->ch.chunk_length = htons(chunk_len);
13288         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13289         /* key id and hmac digest will be computed and filled in upon send */
13290
13291         /* save the offset where the auth was inserted into the chain */
13292         *offset = 0;
13293         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13294                 *offset += SCTP_BUF_LEN(cn);
13295         }
13296
13297         /* update length and return pointer to the auth chunk */
13298         SCTP_BUF_LEN(m_auth) = chunk_len;
13299         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13300         if (auth_ret != NULL)
13301                 *auth_ret = auth;
13302
13303         return (m);
13304 }
13305
13306 #ifdef INET6
13307 int
13308 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13309 {
13310         struct nd_prefix *pfx = NULL;
13311         struct nd_pfxrouter *pfxrtr = NULL;
13312         struct sockaddr_in6 gw6;
13313
13314         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13315                 return (0);
13316
13317         /* get prefix entry of address */
13318         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13319                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13320                         continue;
13321                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13322                     &src6->sin6_addr, &pfx->ndpr_mask))
13323                         break;
13324         }
13325         /* no prefix entry in the prefix list */
13326         if (pfx == NULL) {
13327                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13328                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13329                 return (0);
13330         }
13331         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13332         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13333
13334         /* search installed gateway from prefix entry */
13335         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13336                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13337                 gw6.sin6_family = AF_INET6;
13338                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13339                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13340                     sizeof(struct in6_addr));
13341                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13342                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13343                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13344                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13345                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13346                     ro->ro_rt->rt_gateway)) {
13347                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13348                         return (1);
13349                 }
13350         }
13351         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13352         return (0);
13353 }
13354
13355 #endif
13356
13357 int
13358 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13359 {
13360 #ifdef INET
13361         struct sockaddr_in *sin, *mask;
13362         struct ifaddr *ifa;
13363         struct in_addr srcnetaddr, gwnetaddr;
13364
13365         if (ro == NULL || ro->ro_rt == NULL ||
13366             sifa->address.sa.sa_family != AF_INET) {
13367                 return (0);
13368         }
13369         ifa = (struct ifaddr *)sifa->ifa;
13370         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13371         sin = (struct sockaddr_in *)&sifa->address.sin;
13372         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13373         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13374         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13375         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13376
13377         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13378         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13379         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13380         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13381         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13382         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13383                 return (1);
13384         }
13385 #endif
13386         return (0);
13387 }