sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #include <netinet/udp.h>
  54 #include <netinet/udp_var.h>
  55 #include <machine/in_cksum.h>
  56
  57
  58
  59 #define SCTP_MAX_GAPS_INARRAY 4
  60 struct sack_track {
  61         uint8_t right_edge;     /* mergable on the right edge */
  62         uint8_t left_edge;      /* mergable on the left edge */
  63         uint8_t num_entries;
  64         uint8_t spare;
  65         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  66 };
  67
  68 struct sack_track sack_array[256] = {
  69         {0, 0, 0, 0,            /* 0x00 */
  70                 {{0, 0},
  71                 {0, 0},
  72                 {0, 0},
  73                 {0, 0}
  74                 }
  75         },
  76         {1, 0, 1, 0,            /* 0x01 */
  77                 {{0, 0},
  78                 {0, 0},
  79                 {0, 0},
  80                 {0, 0}
  81                 }
  82         },
  83         {0, 0, 1, 0,            /* 0x02 */
  84                 {{1, 1},
  85                 {0, 0},
  86                 {0, 0},
  87                 {0, 0}
  88                 }
  89         },
  90         {1, 0, 1, 0,            /* 0x03 */
  91                 {{0, 1},
  92                 {0, 0},
  93                 {0, 0},
  94                 {0, 0}
  95                 }
  96         },
  97         {0, 0, 1, 0,            /* 0x04 */
  98                 {{2, 2},
  99                 {0, 0},
 100                 {0, 0},
 101                 {0, 0}
 102                 }
 103         },
 104         {1, 0, 2, 0,            /* 0x05 */
 105                 {{0, 0},
 106                 {2, 2},
 107                 {0, 0},
 108                 {0, 0}
 109                 }
 110         },
 111         {0, 0, 1, 0,            /* 0x06 */
 112                 {{1, 2},
 113                 {0, 0},
 114                 {0, 0},
 115                 {0, 0}
 116                 }
 117         },
 118         {1, 0, 1, 0,            /* 0x07 */
 119                 {{0, 2},
 120                 {0, 0},
 121                 {0, 0},
 122                 {0, 0}
 123                 }
 124         },
 125         {0, 0, 1, 0,            /* 0x08 */
 126                 {{3, 3},
 127                 {0, 0},
 128                 {0, 0},
 129                 {0, 0}
 130                 }
 131         },
 132         {1, 0, 2, 0,            /* 0x09 */
 133                 {{0, 0},
 134                 {3, 3},
 135                 {0, 0},
 136                 {0, 0}
 137                 }
 138         },
 139         {0, 0, 2, 0,            /* 0x0a */
 140                 {{1, 1},
 141                 {3, 3},
 142                 {0, 0},
 143                 {0, 0}
 144                 }
 145         },
 146         {1, 0, 2, 0,            /* 0x0b */
 147                 {{0, 1},
 148                 {3, 3},
 149                 {0, 0},
 150                 {0, 0}
 151                 }
 152         },
 153         {0, 0, 1, 0,            /* 0x0c */
 154                 {{2, 3},
 155                 {0, 0},
 156                 {0, 0},
 157                 {0, 0}
 158                 }
 159         },
 160         {1, 0, 2, 0,            /* 0x0d */
 161                 {{0, 0},
 162                 {2, 3},
 163                 {0, 0},
 164                 {0, 0}
 165                 }
 166         },
 167         {0, 0, 1, 0,            /* 0x0e */
 168                 {{1, 3},
 169                 {0, 0},
 170                 {0, 0},
 171                 {0, 0}
 172                 }
 173         },
 174         {1, 0, 1, 0,            /* 0x0f */
 175                 {{0, 3},
 176                 {0, 0},
 177                 {0, 0},
 178                 {0, 0}
 179                 }
 180         },
 181         {0, 0, 1, 0,            /* 0x10 */
 182                 {{4, 4},
 183                 {0, 0},
 184                 {0, 0},
 185                 {0, 0}
 186                 }
 187         },
 188         {1, 0, 2, 0,            /* 0x11 */
 189                 {{0, 0},
 190                 {4, 4},
 191                 {0, 0},
 192                 {0, 0}
 193                 }
 194         },
 195         {0, 0, 2, 0,            /* 0x12 */
 196                 {{1, 1},
 197                 {4, 4},
 198                 {0, 0},
 199                 {0, 0}
 200                 }
 201         },
 202         {1, 0, 2, 0,            /* 0x13 */
 203                 {{0, 1},
 204                 {4, 4},
 205                 {0, 0},
 206                 {0, 0}
 207                 }
 208         },
 209         {0, 0, 2, 0,            /* 0x14 */
 210                 {{2, 2},
 211                 {4, 4},
 212                 {0, 0},
 213                 {0, 0}
 214                 }
 215         },
 216         {1, 0, 3, 0,            /* 0x15 */
 217                 {{0, 0},
 218                 {2, 2},
 219                 {4, 4},
 220                 {0, 0}
 221                 }
 222         },
 223         {0, 0, 2, 0,            /* 0x16 */
 224                 {{1, 2},
 225                 {4, 4},
 226                 {0, 0},
 227                 {0, 0}
 228                 }
 229         },
 230         {1, 0, 2, 0,            /* 0x17 */
 231                 {{0, 2},
 232                 {4, 4},
 233                 {0, 0},
 234                 {0, 0}
 235                 }
 236         },
 237         {0, 0, 1, 0,            /* 0x18 */
 238                 {{3, 4},
 239                 {0, 0},
 240                 {0, 0},
 241                 {0, 0}
 242                 }
 243         },
 244         {1, 0, 2, 0,            /* 0x19 */
 245                 {{0, 0},
 246                 {3, 4},
 247                 {0, 0},
 248                 {0, 0}
 249                 }
 250         },
 251         {0, 0, 2, 0,            /* 0x1a */
 252                 {{1, 1},
 253                 {3, 4},
 254                 {0, 0},
 255                 {0, 0}
 256                 }
 257         },
 258         {1, 0, 2, 0,            /* 0x1b */
 259                 {{0, 1},
 260                 {3, 4},
 261                 {0, 0},
 262                 {0, 0}
 263                 }
 264         },
 265         {0, 0, 1, 0,            /* 0x1c */
 266                 {{2, 4},
 267                 {0, 0},
 268                 {0, 0},
 269                 {0, 0}
 270                 }
 271         },
 272         {1, 0, 2, 0,            /* 0x1d */
 273                 {{0, 0},
 274                 {2, 4},
 275                 {0, 0},
 276                 {0, 0}
 277                 }
 278         },
 279         {0, 0, 1, 0,            /* 0x1e */
 280                 {{1, 4},
 281                 {0, 0},
 282                 {0, 0},
 283                 {0, 0}
 284                 }
 285         },
 286         {1, 0, 1, 0,            /* 0x1f */
 287                 {{0, 4},
 288                 {0, 0},
 289                 {0, 0},
 290                 {0, 0}
 291                 }
 292         },
 293         {0, 0, 1, 0,            /* 0x20 */
 294                 {{5, 5},
 295                 {0, 0},
 296                 {0, 0},
 297                 {0, 0}
 298                 }
 299         },
 300         {1, 0, 2, 0,            /* 0x21 */
 301                 {{0, 0},
 302                 {5, 5},
 303                 {0, 0},
 304                 {0, 0}
 305                 }
 306         },
 307         {0, 0, 2, 0,            /* 0x22 */
 308                 {{1, 1},
 309                 {5, 5},
 310                 {0, 0},
 311                 {0, 0}
 312                 }
 313         },
 314         {1, 0, 2, 0,            /* 0x23 */
 315                 {{0, 1},
 316                 {5, 5},
 317                 {0, 0},
 318                 {0, 0}
 319                 }
 320         },
 321         {0, 0, 2, 0,            /* 0x24 */
 322                 {{2, 2},
 323                 {5, 5},
 324                 {0, 0},
 325                 {0, 0}
 326                 }
 327         },
 328         {1, 0, 3, 0,            /* 0x25 */
 329                 {{0, 0},
 330                 {2, 2},
 331                 {5, 5},
 332                 {0, 0}
 333                 }
 334         },
 335         {0, 0, 2, 0,            /* 0x26 */
 336                 {{1, 2},
 337                 {5, 5},
 338                 {0, 0},
 339                 {0, 0}
 340                 }
 341         },
 342         {1, 0, 2, 0,            /* 0x27 */
 343                 {{0, 2},
 344                 {5, 5},
 345                 {0, 0},
 346                 {0, 0}
 347                 }
 348         },
 349         {0, 0, 2, 0,            /* 0x28 */
 350                 {{3, 3},
 351                 {5, 5},
 352                 {0, 0},
 353                 {0, 0}
 354                 }
 355         },
 356         {1, 0, 3, 0,            /* 0x29 */
 357                 {{0, 0},
 358                 {3, 3},
 359                 {5, 5},
 360                 {0, 0}
 361                 }
 362         },
 363         {0, 0, 3, 0,            /* 0x2a */
 364                 {{1, 1},
 365                 {3, 3},
 366                 {5, 5},
 367                 {0, 0}
 368                 }
 369         },
 370         {1, 0, 3, 0,            /* 0x2b */
 371                 {{0, 1},
 372                 {3, 3},
 373                 {5, 5},
 374                 {0, 0}
 375                 }
 376         },
 377         {0, 0, 2, 0,            /* 0x2c */
 378                 {{2, 3},
 379                 {5, 5},
 380                 {0, 0},
 381                 {0, 0}
 382                 }
 383         },
 384         {1, 0, 3, 0,            /* 0x2d */
 385                 {{0, 0},
 386                 {2, 3},
 387                 {5, 5},
 388                 {0, 0}
 389                 }
 390         },
 391         {0, 0, 2, 0,            /* 0x2e */
 392                 {{1, 3},
 393                 {5, 5},
 394                 {0, 0},
 395                 {0, 0}
 396                 }
 397         },
 398         {1, 0, 2, 0,            /* 0x2f */
 399                 {{0, 3},
 400                 {5, 5},
 401                 {0, 0},
 402                 {0, 0}
 403                 }
 404         },
 405         {0, 0, 1, 0,            /* 0x30 */
 406                 {{4, 5},
 407                 {0, 0},
 408                 {0, 0},
 409                 {0, 0}
 410                 }
 411         },
 412         {1, 0, 2, 0,            /* 0x31 */
 413                 {{0, 0},
 414                 {4, 5},
 415                 {0, 0},
 416                 {0, 0}
 417                 }
 418         },
 419         {0, 0, 2, 0,            /* 0x32 */
 420                 {{1, 1},
 421                 {4, 5},
 422                 {0, 0},
 423                 {0, 0}
 424                 }
 425         },
 426         {1, 0, 2, 0,            /* 0x33 */
 427                 {{0, 1},
 428                 {4, 5},
 429                 {0, 0},
 430                 {0, 0}
 431                 }
 432         },
 433         {0, 0, 2, 0,            /* 0x34 */
 434                 {{2, 2},
 435                 {4, 5},
 436                 {0, 0},
 437                 {0, 0}
 438                 }
 439         },
 440         {1, 0, 3, 0,            /* 0x35 */
 441                 {{0, 0},
 442                 {2, 2},
 443                 {4, 5},
 444                 {0, 0}
 445                 }
 446         },
 447         {0, 0, 2, 0,            /* 0x36 */
 448                 {{1, 2},
 449                 {4, 5},
 450                 {0, 0},
 451                 {0, 0}
 452                 }
 453         },
 454         {1, 0, 2, 0,            /* 0x37 */
 455                 {{0, 2},
 456                 {4, 5},
 457                 {0, 0},
 458                 {0, 0}
 459                 }
 460         },
 461         {0, 0, 1, 0,            /* 0x38 */
 462                 {{3, 5},
 463                 {0, 0},
 464                 {0, 0},
 465                 {0, 0}
 466                 }
 467         },
 468         {1, 0, 2, 0,            /* 0x39 */
 469                 {{0, 0},
 470                 {3, 5},
 471                 {0, 0},
 472                 {0, 0}
 473                 }
 474         },
 475         {0, 0, 2, 0,            /* 0x3a */
 476                 {{1, 1},
 477                 {3, 5},
 478                 {0, 0},
 479                 {0, 0}
 480                 }
 481         },
 482         {1, 0, 2, 0,            /* 0x3b */
 483                 {{0, 1},
 484                 {3, 5},
 485                 {0, 0},
 486                 {0, 0}
 487                 }
 488         },
 489         {0, 0, 1, 0,            /* 0x3c */
 490                 {{2, 5},
 491                 {0, 0},
 492                 {0, 0},
 493                 {0, 0}
 494                 }
 495         },
 496         {1, 0, 2, 0,            /* 0x3d */
 497                 {{0, 0},
 498                 {2, 5},
 499                 {0, 0},
 500                 {0, 0}
 501                 }
 502         },
 503         {0, 0, 1, 0,            /* 0x3e */
 504                 {{1, 5},
 505                 {0, 0},
 506                 {0, 0},
 507                 {0, 0}
 508                 }
 509         },
 510         {1, 0, 1, 0,            /* 0x3f */
 511                 {{0, 5},
 512                 {0, 0},
 513                 {0, 0},
 514                 {0, 0}
 515                 }
 516         },
 517         {0, 0, 1, 0,            /* 0x40 */
 518                 {{6, 6},
 519                 {0, 0},
 520                 {0, 0},
 521                 {0, 0}
 522                 }
 523         },
 524         {1, 0, 2, 0,            /* 0x41 */
 525                 {{0, 0},
 526                 {6, 6},
 527                 {0, 0},
 528                 {0, 0}
 529                 }
 530         },
 531         {0, 0, 2, 0,            /* 0x42 */
 532                 {{1, 1},
 533                 {6, 6},
 534                 {0, 0},
 535                 {0, 0}
 536                 }
 537         },
 538         {1, 0, 2, 0,            /* 0x43 */
 539                 {{0, 1},
 540                 {6, 6},
 541                 {0, 0},
 542                 {0, 0}
 543                 }
 544         },
 545         {0, 0, 2, 0,            /* 0x44 */
 546                 {{2, 2},
 547                 {6, 6},
 548                 {0, 0},
 549                 {0, 0}
 550                 }
 551         },
 552         {1, 0, 3, 0,            /* 0x45 */
 553                 {{0, 0},
 554                 {2, 2},
 555                 {6, 6},
 556                 {0, 0}
 557                 }
 558         },
 559         {0, 0, 2, 0,            /* 0x46 */
 560                 {{1, 2},
 561                 {6, 6},
 562                 {0, 0},
 563                 {0, 0}
 564                 }
 565         },
 566         {1, 0, 2, 0,            /* 0x47 */
 567                 {{0, 2},
 568                 {6, 6},
 569                 {0, 0},
 570                 {0, 0}
 571                 }
 572         },
 573         {0, 0, 2, 0,            /* 0x48 */
 574                 {{3, 3},
 575                 {6, 6},
 576                 {0, 0},
 577                 {0, 0}
 578                 }
 579         },
 580         {1, 0, 3, 0,            /* 0x49 */
 581                 {{0, 0},
 582                 {3, 3},
 583                 {6, 6},
 584                 {0, 0}
 585                 }
 586         },
 587         {0, 0, 3, 0,            /* 0x4a */
 588                 {{1, 1},
 589                 {3, 3},
 590                 {6, 6},
 591                 {0, 0}
 592                 }
 593         },
 594         {1, 0, 3, 0,            /* 0x4b */
 595                 {{0, 1},
 596                 {3, 3},
 597                 {6, 6},
 598                 {0, 0}
 599                 }
 600         },
 601         {0, 0, 2, 0,            /* 0x4c */
 602                 {{2, 3},
 603                 {6, 6},
 604                 {0, 0},
 605                 {0, 0}
 606                 }
 607         },
 608         {1, 0, 3, 0,            /* 0x4d */
 609                 {{0, 0},
 610                 {2, 3},
 611                 {6, 6},
 612                 {0, 0}
 613                 }
 614         },
 615         {0, 0, 2, 0,            /* 0x4e */
 616                 {{1, 3},
 617                 {6, 6},
 618                 {0, 0},
 619                 {0, 0}
 620                 }
 621         },
 622         {1, 0, 2, 0,            /* 0x4f */
 623                 {{0, 3},
 624                 {6, 6},
 625                 {0, 0},
 626                 {0, 0}
 627                 }
 628         },
 629         {0, 0, 2, 0,            /* 0x50 */
 630                 {{4, 4},
 631                 {6, 6},
 632                 {0, 0},
 633                 {0, 0}
 634                 }
 635         },
 636         {1, 0, 3, 0,            /* 0x51 */
 637                 {{0, 0},
 638                 {4, 4},
 639                 {6, 6},
 640                 {0, 0}
 641                 }
 642         },
 643         {0, 0, 3, 0,            /* 0x52 */
 644                 {{1, 1},
 645                 {4, 4},
 646                 {6, 6},
 647                 {0, 0}
 648                 }
 649         },
 650         {1, 0, 3, 0,            /* 0x53 */
 651                 {{0, 1},
 652                 {4, 4},
 653                 {6, 6},
 654                 {0, 0}
 655                 }
 656         },
 657         {0, 0, 3, 0,            /* 0x54 */
 658                 {{2, 2},
 659                 {4, 4},
 660                 {6, 6},
 661                 {0, 0}
 662                 }
 663         },
 664         {1, 0, 4, 0,            /* 0x55 */
 665                 {{0, 0},
 666                 {2, 2},
 667                 {4, 4},
 668                 {6, 6}
 669                 }
 670         },
 671         {0, 0, 3, 0,            /* 0x56 */
 672                 {{1, 2},
 673                 {4, 4},
 674                 {6, 6},
 675                 {0, 0}
 676                 }
 677         },
 678         {1, 0, 3, 0,            /* 0x57 */
 679                 {{0, 2},
 680                 {4, 4},
 681                 {6, 6},
 682                 {0, 0}
 683                 }
 684         },
 685         {0, 0, 2, 0,            /* 0x58 */
 686                 {{3, 4},
 687                 {6, 6},
 688                 {0, 0},
 689                 {0, 0}
 690                 }
 691         },
 692         {1, 0, 3, 0,            /* 0x59 */
 693                 {{0, 0},
 694                 {3, 4},
 695                 {6, 6},
 696                 {0, 0}
 697                 }
 698         },
 699         {0, 0, 3, 0,            /* 0x5a */
 700                 {{1, 1},
 701                 {3, 4},
 702                 {6, 6},
 703                 {0, 0}
 704                 }
 705         },
 706         {1, 0, 3, 0,            /* 0x5b */
 707                 {{0, 1},
 708                 {3, 4},
 709                 {6, 6},
 710                 {0, 0}
 711                 }
 712         },
 713         {0, 0, 2, 0,            /* 0x5c */
 714                 {{2, 4},
 715                 {6, 6},
 716                 {0, 0},
 717                 {0, 0}
 718                 }
 719         },
 720         {1, 0, 3, 0,            /* 0x5d */
 721                 {{0, 0},
 722                 {2, 4},
 723                 {6, 6},
 724                 {0, 0}
 725                 }
 726         },
 727         {0, 0, 2, 0,            /* 0x5e */
 728                 {{1, 4},
 729                 {6, 6},
 730                 {0, 0},
 731                 {0, 0}
 732                 }
 733         },
 734         {1, 0, 2, 0,            /* 0x5f */
 735                 {{0, 4},
 736                 {6, 6},
 737                 {0, 0},
 738                 {0, 0}
 739                 }
 740         },
 741         {0, 0, 1, 0,            /* 0x60 */
 742                 {{5, 6},
 743                 {0, 0},
 744                 {0, 0},
 745                 {0, 0}
 746                 }
 747         },
 748         {1, 0, 2, 0,            /* 0x61 */
 749                 {{0, 0},
 750                 {5, 6},
 751                 {0, 0},
 752                 {0, 0}
 753                 }
 754         },
 755         {0, 0, 2, 0,            /* 0x62 */
 756                 {{1, 1},
 757                 {5, 6},
 758                 {0, 0},
 759                 {0, 0}
 760                 }
 761         },
 762         {1, 0, 2, 0,            /* 0x63 */
 763                 {{0, 1},
 764                 {5, 6},
 765                 {0, 0},
 766                 {0, 0}
 767                 }
 768         },
 769         {0, 0, 2, 0,            /* 0x64 */
 770                 {{2, 2},
 771                 {5, 6},
 772                 {0, 0},
 773                 {0, 0}
 774                 }
 775         },
 776         {1, 0, 3, 0,            /* 0x65 */
 777                 {{0, 0},
 778                 {2, 2},
 779                 {5, 6},
 780                 {0, 0}
 781                 }
 782         },
 783         {0, 0, 2, 0,            /* 0x66 */
 784                 {{1, 2},
 785                 {5, 6},
 786                 {0, 0},
 787                 {0, 0}
 788                 }
 789         },
 790         {1, 0, 2, 0,            /* 0x67 */
 791                 {{0, 2},
 792                 {5, 6},
 793                 {0, 0},
 794                 {0, 0}
 795                 }
 796         },
 797         {0, 0, 2, 0,            /* 0x68 */
 798                 {{3, 3},
 799                 {5, 6},
 800                 {0, 0},
 801                 {0, 0}
 802                 }
 803         },
 804         {1, 0, 3, 0,            /* 0x69 */
 805                 {{0, 0},
 806                 {3, 3},
 807                 {5, 6},
 808                 {0, 0}
 809                 }
 810         },
 811         {0, 0, 3, 0,            /* 0x6a */
 812                 {{1, 1},
 813                 {3, 3},
 814                 {5, 6},
 815                 {0, 0}
 816                 }
 817         },
 818         {1, 0, 3, 0,            /* 0x6b */
 819                 {{0, 1},
 820                 {3, 3},
 821                 {5, 6},
 822                 {0, 0}
 823                 }
 824         },
 825         {0, 0, 2, 0,            /* 0x6c */
 826                 {{2, 3},
 827                 {5, 6},
 828                 {0, 0},
 829                 {0, 0}
 830                 }
 831         },
 832         {1, 0, 3, 0,            /* 0x6d */
 833                 {{0, 0},
 834                 {2, 3},
 835                 {5, 6},
 836                 {0, 0}
 837                 }
 838         },
 839         {0, 0, 2, 0,            /* 0x6e */
 840                 {{1, 3},
 841                 {5, 6},
 842                 {0, 0},
 843                 {0, 0}
 844                 }
 845         },
 846         {1, 0, 2, 0,            /* 0x6f */
 847                 {{0, 3},
 848                 {5, 6},
 849                 {0, 0},
 850                 {0, 0}
 851                 }
 852         },
 853         {0, 0, 1, 0,            /* 0x70 */
 854                 {{4, 6},
 855                 {0, 0},
 856                 {0, 0},
 857                 {0, 0}
 858                 }
 859         },
 860         {1, 0, 2, 0,            /* 0x71 */
 861                 {{0, 0},
 862                 {4, 6},
 863                 {0, 0},
 864                 {0, 0}
 865                 }
 866         },
 867         {0, 0, 2, 0,            /* 0x72 */
 868                 {{1, 1},
 869                 {4, 6},
 870                 {0, 0},
 871                 {0, 0}
 872                 }
 873         },
 874         {1, 0, 2, 0,            /* 0x73 */
 875                 {{0, 1},
 876                 {4, 6},
 877                 {0, 0},
 878                 {0, 0}
 879                 }
 880         },
 881         {0, 0, 2, 0,            /* 0x74 */
 882                 {{2, 2},
 883                 {4, 6},
 884                 {0, 0},
 885                 {0, 0}
 886                 }
 887         },
 888         {1, 0, 3, 0,            /* 0x75 */
 889                 {{0, 0},
 890                 {2, 2},
 891                 {4, 6},
 892                 {0, 0}
 893                 }
 894         },
 895         {0, 0, 2, 0,            /* 0x76 */
 896                 {{1, 2},
 897                 {4, 6},
 898                 {0, 0},
 899                 {0, 0}
 900                 }
 901         },
 902         {1, 0, 2, 0,            /* 0x77 */
 903                 {{0, 2},
 904                 {4, 6},
 905                 {0, 0},
 906                 {0, 0}
 907                 }
 908         },
 909         {0, 0, 1, 0,            /* 0x78 */
 910                 {{3, 6},
 911                 {0, 0},
 912                 {0, 0},
 913                 {0, 0}
 914                 }
 915         },
 916         {1, 0, 2, 0,            /* 0x79 */
 917                 {{0, 0},
 918                 {3, 6},
 919                 {0, 0},
 920                 {0, 0}
 921                 }
 922         },
 923         {0, 0, 2, 0,            /* 0x7a */
 924                 {{1, 1},
 925                 {3, 6},
 926                 {0, 0},
 927                 {0, 0}
 928                 }
 929         },
 930         {1, 0, 2, 0,            /* 0x7b */
 931                 {{0, 1},
 932                 {3, 6},
 933                 {0, 0},
 934                 {0, 0}
 935                 }
 936         },
 937         {0, 0, 1, 0,            /* 0x7c */
 938                 {{2, 6},
 939                 {0, 0},
 940                 {0, 0},
 941                 {0, 0}
 942                 }
 943         },
 944         {1, 0, 2, 0,            /* 0x7d */
 945                 {{0, 0},
 946                 {2, 6},
 947                 {0, 0},
 948                 {0, 0}
 949                 }
 950         },
 951         {0, 0, 1, 0,            /* 0x7e */
 952                 {{1, 6},
 953                 {0, 0},
 954                 {0, 0},
 955                 {0, 0}
 956                 }
 957         },
 958         {1, 0, 1, 0,            /* 0x7f */
 959                 {{0, 6},
 960                 {0, 0},
 961                 {0, 0},
 962                 {0, 0}
 963                 }
 964         },
 965         {0, 1, 1, 0,            /* 0x80 */
 966                 {{7, 7},
 967                 {0, 0},
 968                 {0, 0},
 969                 {0, 0}
 970                 }
 971         },
 972         {1, 1, 2, 0,            /* 0x81 */
 973                 {{0, 0},
 974                 {7, 7},
 975                 {0, 0},
 976                 {0, 0}
 977                 }
 978         },
 979         {0, 1, 2, 0,            /* 0x82 */
 980                 {{1, 1},
 981                 {7, 7},
 982                 {0, 0},
 983                 {0, 0}
 984                 }
 985         },
 986         {1, 1, 2, 0,            /* 0x83 */
 987                 {{0, 1},
 988                 {7, 7},
 989                 {0, 0},
 990                 {0, 0}
 991                 }
 992         },
 993         {0, 1, 2, 0,            /* 0x84 */
 994                 {{2, 2},
 995                 {7, 7},
 996                 {0, 0},
 997                 {0, 0}
 998                 }
 999         },
1000         {1, 1, 3, 0,            /* 0x85 */
1001                 {{0, 0},
1002                 {2, 2},
1003                 {7, 7},
1004                 {0, 0}
1005                 }
1006         },
1007         {0, 1, 2, 0,            /* 0x86 */
1008                 {{1, 2},
1009                 {7, 7},
1010                 {0, 0},
1011                 {0, 0}
1012                 }
1013         },
1014         {1, 1, 2, 0,            /* 0x87 */
1015                 {{0, 2},
1016                 {7, 7},
1017                 {0, 0},
1018                 {0, 0}
1019                 }
1020         },
1021         {0, 1, 2, 0,            /* 0x88 */
1022                 {{3, 3},
1023                 {7, 7},
1024                 {0, 0},
1025                 {0, 0}
1026                 }
1027         },
1028         {1, 1, 3, 0,            /* 0x89 */
1029                 {{0, 0},
1030                 {3, 3},
1031                 {7, 7},
1032                 {0, 0}
1033                 }
1034         },
1035         {0, 1, 3, 0,            /* 0x8a */
1036                 {{1, 1},
1037                 {3, 3},
1038                 {7, 7},
1039                 {0, 0}
1040                 }
1041         },
1042         {1, 1, 3, 0,            /* 0x8b */
1043                 {{0, 1},
1044                 {3, 3},
1045                 {7, 7},
1046                 {0, 0}
1047                 }
1048         },
1049         {0, 1, 2, 0,            /* 0x8c */
1050                 {{2, 3},
1051                 {7, 7},
1052                 {0, 0},
1053                 {0, 0}
1054                 }
1055         },
1056         {1, 1, 3, 0,            /* 0x8d */
1057                 {{0, 0},
1058                 {2, 3},
1059                 {7, 7},
1060                 {0, 0}
1061                 }
1062         },
1063         {0, 1, 2, 0,            /* 0x8e */
1064                 {{1, 3},
1065                 {7, 7},
1066                 {0, 0},
1067                 {0, 0}
1068                 }
1069         },
1070         {1, 1, 2, 0,            /* 0x8f */
1071                 {{0, 3},
1072                 {7, 7},
1073                 {0, 0},
1074                 {0, 0}
1075                 }
1076         },
1077         {0, 1, 2, 0,            /* 0x90 */
1078                 {{4, 4},
1079                 {7, 7},
1080                 {0, 0},
1081                 {0, 0}
1082                 }
1083         },
1084         {1, 1, 3, 0,            /* 0x91 */
1085                 {{0, 0},
1086                 {4, 4},
1087                 {7, 7},
1088                 {0, 0}
1089                 }
1090         },
1091         {0, 1, 3, 0,            /* 0x92 */
1092                 {{1, 1},
1093                 {4, 4},
1094                 {7, 7},
1095                 {0, 0}
1096                 }
1097         },
1098         {1, 1, 3, 0,            /* 0x93 */
1099                 {{0, 1},
1100                 {4, 4},
1101                 {7, 7},
1102                 {0, 0}
1103                 }
1104         },
1105         {0, 1, 3, 0,            /* 0x94 */
1106                 {{2, 2},
1107                 {4, 4},
1108                 {7, 7},
1109                 {0, 0}
1110                 }
1111         },
1112         {1, 1, 4, 0,            /* 0x95 */
1113                 {{0, 0},
1114                 {2, 2},
1115                 {4, 4},
1116                 {7, 7}
1117                 }
1118         },
1119         {0, 1, 3, 0,            /* 0x96 */
1120                 {{1, 2},
1121                 {4, 4},
1122                 {7, 7},
1123                 {0, 0}
1124                 }
1125         },
1126         {1, 1, 3, 0,            /* 0x97 */
1127                 {{0, 2},
1128                 {4, 4},
1129                 {7, 7},
1130                 {0, 0}
1131                 }
1132         },
1133         {0, 1, 2, 0,            /* 0x98 */
1134                 {{3, 4},
1135                 {7, 7},
1136                 {0, 0},
1137                 {0, 0}
1138                 }
1139         },
1140         {1, 1, 3, 0,            /* 0x99 */
1141                 {{0, 0},
1142                 {3, 4},
1143                 {7, 7},
1144                 {0, 0}
1145                 }
1146         },
1147         {0, 1, 3, 0,            /* 0x9a */
1148                 {{1, 1},
1149                 {3, 4},
1150                 {7, 7},
1151                 {0, 0}
1152                 }
1153         },
1154         {1, 1, 3, 0,            /* 0x9b */
1155                 {{0, 1},
1156                 {3, 4},
1157                 {7, 7},
1158                 {0, 0}
1159                 }
1160         },
1161         {0, 1, 2, 0,            /* 0x9c */
1162                 {{2, 4},
1163                 {7, 7},
1164                 {0, 0},
1165                 {0, 0}
1166                 }
1167         },
1168         {1, 1, 3, 0,            /* 0x9d */
1169                 {{0, 0},
1170                 {2, 4},
1171                 {7, 7},
1172                 {0, 0}
1173                 }
1174         },
1175         {0, 1, 2, 0,            /* 0x9e */
1176                 {{1, 4},
1177                 {7, 7},
1178                 {0, 0},
1179                 {0, 0}
1180                 }
1181         },
1182         {1, 1, 2, 0,            /* 0x9f */
1183                 {{0, 4},
1184                 {7, 7},
1185                 {0, 0},
1186                 {0, 0}
1187                 }
1188         },
1189         {0, 1, 2, 0,            /* 0xa0 */
1190                 {{5, 5},
1191                 {7, 7},
1192                 {0, 0},
1193                 {0, 0}
1194                 }
1195         },
1196         {1, 1, 3, 0,            /* 0xa1 */
1197                 {{0, 0},
1198                 {5, 5},
1199                 {7, 7},
1200                 {0, 0}
1201                 }
1202         },
1203         {0, 1, 3, 0,            /* 0xa2 */
1204                 {{1, 1},
1205                 {5, 5},
1206                 {7, 7},
1207                 {0, 0}
1208                 }
1209         },
1210         {1, 1, 3, 0,            /* 0xa3 */
1211                 {{0, 1},
1212                 {5, 5},
1213                 {7, 7},
1214                 {0, 0}
1215                 }
1216         },
1217         {0, 1, 3, 0,            /* 0xa4 */
1218                 {{2, 2},
1219                 {5, 5},
1220                 {7, 7},
1221                 {0, 0}
1222                 }
1223         },
1224         {1, 1, 4, 0,            /* 0xa5 */
1225                 {{0, 0},
1226                 {2, 2},
1227                 {5, 5},
1228                 {7, 7}
1229                 }
1230         },
1231         {0, 1, 3, 0,            /* 0xa6 */
1232                 {{1, 2},
1233                 {5, 5},
1234                 {7, 7},
1235                 {0, 0}
1236                 }
1237         },
1238         {1, 1, 3, 0,            /* 0xa7 */
1239                 {{0, 2},
1240                 {5, 5},
1241                 {7, 7},
1242                 {0, 0}
1243                 }
1244         },
1245         {0, 1, 3, 0,            /* 0xa8 */
1246                 {{3, 3},
1247                 {5, 5},
1248                 {7, 7},
1249                 {0, 0}
1250                 }
1251         },
1252         {1, 1, 4, 0,            /* 0xa9 */
1253                 {{0, 0},
1254                 {3, 3},
1255                 {5, 5},
1256                 {7, 7}
1257                 }
1258         },
1259         {0, 1, 4, 0,            /* 0xaa */
1260                 {{1, 1},
1261                 {3, 3},
1262                 {5, 5},
1263                 {7, 7}
1264                 }
1265         },
1266         {1, 1, 4, 0,            /* 0xab */
1267                 {{0, 1},
1268                 {3, 3},
1269                 {5, 5},
1270                 {7, 7}
1271                 }
1272         },
1273         {0, 1, 3, 0,            /* 0xac */
1274                 {{2, 3},
1275                 {5, 5},
1276                 {7, 7},
1277                 {0, 0}
1278                 }
1279         },
1280         {1, 1, 4, 0,            /* 0xad */
1281                 {{0, 0},
1282                 {2, 3},
1283                 {5, 5},
1284                 {7, 7}
1285                 }
1286         },
1287         {0, 1, 3, 0,            /* 0xae */
1288                 {{1, 3},
1289                 {5, 5},
1290                 {7, 7},
1291                 {0, 0}
1292                 }
1293         },
1294         {1, 1, 3, 0,            /* 0xaf */
1295                 {{0, 3},
1296                 {5, 5},
1297                 {7, 7},
1298                 {0, 0}
1299                 }
1300         },
1301         {0, 1, 2, 0,            /* 0xb0 */
1302                 {{4, 5},
1303                 {7, 7},
1304                 {0, 0},
1305                 {0, 0}
1306                 }
1307         },
1308         {1, 1, 3, 0,            /* 0xb1 */
1309                 {{0, 0},
1310                 {4, 5},
1311                 {7, 7},
1312                 {0, 0}
1313                 }
1314         },
1315         {0, 1, 3, 0,            /* 0xb2 */
1316                 {{1, 1},
1317                 {4, 5},
1318                 {7, 7},
1319                 {0, 0}
1320                 }
1321         },
1322         {1, 1, 3, 0,            /* 0xb3 */
1323                 {{0, 1},
1324                 {4, 5},
1325                 {7, 7},
1326                 {0, 0}
1327                 }
1328         },
1329         {0, 1, 3, 0,            /* 0xb4 */
1330                 {{2, 2},
1331                 {4, 5},
1332                 {7, 7},
1333                 {0, 0}
1334                 }
1335         },
1336         {1, 1, 4, 0,            /* 0xb5 */
1337                 {{0, 0},
1338                 {2, 2},
1339                 {4, 5},
1340                 {7, 7}
1341                 }
1342         },
1343         {0, 1, 3, 0,            /* 0xb6 */
1344                 {{1, 2},
1345                 {4, 5},
1346                 {7, 7},
1347                 {0, 0}
1348                 }
1349         },
1350         {1, 1, 3, 0,            /* 0xb7 */
1351                 {{0, 2},
1352                 {4, 5},
1353                 {7, 7},
1354                 {0, 0}
1355                 }
1356         },
1357         {0, 1, 2, 0,            /* 0xb8 */
1358                 {{3, 5},
1359                 {7, 7},
1360                 {0, 0},
1361                 {0, 0}
1362                 }
1363         },
1364         {1, 1, 3, 0,            /* 0xb9 */
1365                 {{0, 0},
1366                 {3, 5},
1367                 {7, 7},
1368                 {0, 0}
1369                 }
1370         },
1371         {0, 1, 3, 0,            /* 0xba */
1372                 {{1, 1},
1373                 {3, 5},
1374                 {7, 7},
1375                 {0, 0}
1376                 }
1377         },
1378         {1, 1, 3, 0,            /* 0xbb */
1379                 {{0, 1},
1380                 {3, 5},
1381                 {7, 7},
1382                 {0, 0}
1383                 }
1384         },
1385         {0, 1, 2, 0,            /* 0xbc */
1386                 {{2, 5},
1387                 {7, 7},
1388                 {0, 0},
1389                 {0, 0}
1390                 }
1391         },
1392         {1, 1, 3, 0,            /* 0xbd */
1393                 {{0, 0},
1394                 {2, 5},
1395                 {7, 7},
1396                 {0, 0}
1397                 }
1398         },
1399         {0, 1, 2, 0,            /* 0xbe */
1400                 {{1, 5},
1401                 {7, 7},
1402                 {0, 0},
1403                 {0, 0}
1404                 }
1405         },
1406         {1, 1, 2, 0,            /* 0xbf */
1407                 {{0, 5},
1408                 {7, 7},
1409                 {0, 0},
1410                 {0, 0}
1411                 }
1412         },
1413         {0, 1, 1, 0,            /* 0xc0 */
1414                 {{6, 7},
1415                 {0, 0},
1416                 {0, 0},
1417                 {0, 0}
1418                 }
1419         },
1420         {1, 1, 2, 0,            /* 0xc1 */
1421                 {{0, 0},
1422                 {6, 7},
1423                 {0, 0},
1424                 {0, 0}
1425                 }
1426         },
1427         {0, 1, 2, 0,            /* 0xc2 */
1428                 {{1, 1},
1429                 {6, 7},
1430                 {0, 0},
1431                 {0, 0}
1432                 }
1433         },
1434         {1, 1, 2, 0,            /* 0xc3 */
1435                 {{0, 1},
1436                 {6, 7},
1437                 {0, 0},
1438                 {0, 0}
1439                 }
1440         },
1441         {0, 1, 2, 0,            /* 0xc4 */
1442                 {{2, 2},
1443                 {6, 7},
1444                 {0, 0},
1445                 {0, 0}
1446                 }
1447         },
1448         {1, 1, 3, 0,            /* 0xc5 */
1449                 {{0, 0},
1450                 {2, 2},
1451                 {6, 7},
1452                 {0, 0}
1453                 }
1454         },
1455         {0, 1, 2, 0,            /* 0xc6 */
1456                 {{1, 2},
1457                 {6, 7},
1458                 {0, 0},
1459                 {0, 0}
1460                 }
1461         },
1462         {1, 1, 2, 0,            /* 0xc7 */
1463                 {{0, 2},
1464                 {6, 7},
1465                 {0, 0},
1466                 {0, 0}
1467                 }
1468         },
1469         {0, 1, 2, 0,            /* 0xc8 */
1470                 {{3, 3},
1471                 {6, 7},
1472                 {0, 0},
1473                 {0, 0}
1474                 }
1475         },
1476         {1, 1, 3, 0,            /* 0xc9 */
1477                 {{0, 0},
1478                 {3, 3},
1479                 {6, 7},
1480                 {0, 0}
1481                 }
1482         },
1483         {0, 1, 3, 0,            /* 0xca */
1484                 {{1, 1},
1485                 {3, 3},
1486                 {6, 7},
1487                 {0, 0}
1488                 }
1489         },
1490         {1, 1, 3, 0,            /* 0xcb */
1491                 {{0, 1},
1492                 {3, 3},
1493                 {6, 7},
1494                 {0, 0}
1495                 }
1496         },
1497         {0, 1, 2, 0,            /* 0xcc */
1498                 {{2, 3},
1499                 {6, 7},
1500                 {0, 0},
1501                 {0, 0}
1502                 }
1503         },
1504         {1, 1, 3, 0,            /* 0xcd */
1505                 {{0, 0},
1506                 {2, 3},
1507                 {6, 7},
1508                 {0, 0}
1509                 }
1510         },
1511         {0, 1, 2, 0,            /* 0xce */
1512                 {{1, 3},
1513                 {6, 7},
1514                 {0, 0},
1515                 {0, 0}
1516                 }
1517         },
1518         {1, 1, 2, 0,            /* 0xcf */
1519                 {{0, 3},
1520                 {6, 7},
1521                 {0, 0},
1522                 {0, 0}
1523                 }
1524         },
1525         {0, 1, 2, 0,            /* 0xd0 */
1526                 {{4, 4},
1527                 {6, 7},
1528                 {0, 0},
1529                 {0, 0}
1530                 }
1531         },
1532         {1, 1, 3, 0,            /* 0xd1 */
1533                 {{0, 0},
1534                 {4, 4},
1535                 {6, 7},
1536                 {0, 0}
1537                 }
1538         },
1539         {0, 1, 3, 0,            /* 0xd2 */
1540                 {{1, 1},
1541                 {4, 4},
1542                 {6, 7},
1543                 {0, 0}
1544                 }
1545         },
1546         {1, 1, 3, 0,            /* 0xd3 */
1547                 {{0, 1},
1548                 {4, 4},
1549                 {6, 7},
1550                 {0, 0}
1551                 }
1552         },
1553         {0, 1, 3, 0,            /* 0xd4 */
1554                 {{2, 2},
1555                 {4, 4},
1556                 {6, 7},
1557                 {0, 0}
1558                 }
1559         },
1560         {1, 1, 4, 0,            /* 0xd5 */
1561                 {{0, 0},
1562                 {2, 2},
1563                 {4, 4},
1564                 {6, 7}
1565                 }
1566         },
1567         {0, 1, 3, 0,            /* 0xd6 */
1568                 {{1, 2},
1569                 {4, 4},
1570                 {6, 7},
1571                 {0, 0}
1572                 }
1573         },
1574         {1, 1, 3, 0,            /* 0xd7 */
1575                 {{0, 2},
1576                 {4, 4},
1577                 {6, 7},
1578                 {0, 0}
1579                 }
1580         },
1581         {0, 1, 2, 0,            /* 0xd8 */
1582                 {{3, 4},
1583                 {6, 7},
1584                 {0, 0},
1585                 {0, 0}
1586                 }
1587         },
1588         {1, 1, 3, 0,            /* 0xd9 */
1589                 {{0, 0},
1590                 {3, 4},
1591                 {6, 7},
1592                 {0, 0}
1593                 }
1594         },
1595         {0, 1, 3, 0,            /* 0xda */
1596                 {{1, 1},
1597                 {3, 4},
1598                 {6, 7},
1599                 {0, 0}
1600                 }
1601         },
1602         {1, 1, 3, 0,            /* 0xdb */
1603                 {{0, 1},
1604                 {3, 4},
1605                 {6, 7},
1606                 {0, 0}
1607                 }
1608         },
1609         {0, 1, 2, 0,            /* 0xdc */
1610                 {{2, 4},
1611                 {6, 7},
1612                 {0, 0},
1613                 {0, 0}
1614                 }
1615         },
1616         {1, 1, 3, 0,            /* 0xdd */
1617                 {{0, 0},
1618                 {2, 4},
1619                 {6, 7},
1620                 {0, 0}
1621                 }
1622         },
1623         {0, 1, 2, 0,            /* 0xde */
1624                 {{1, 4},
1625                 {6, 7},
1626                 {0, 0},
1627                 {0, 0}
1628                 }
1629         },
1630         {1, 1, 2, 0,            /* 0xdf */
1631                 {{0, 4},
1632                 {6, 7},
1633                 {0, 0},
1634                 {0, 0}
1635                 }
1636         },
1637         {0, 1, 1, 0,            /* 0xe0 */
1638                 {{5, 7},
1639                 {0, 0},
1640                 {0, 0},
1641                 {0, 0}
1642                 }
1643         },
1644         {1, 1, 2, 0,            /* 0xe1 */
1645                 {{0, 0},
1646                 {5, 7},
1647                 {0, 0},
1648                 {0, 0}
1649                 }
1650         },
1651         {0, 1, 2, 0,            /* 0xe2 */
1652                 {{1, 1},
1653                 {5, 7},
1654                 {0, 0},
1655                 {0, 0}
1656                 }
1657         },
1658         {1, 1, 2, 0,            /* 0xe3 */
1659                 {{0, 1},
1660                 {5, 7},
1661                 {0, 0},
1662                 {0, 0}
1663                 }
1664         },
1665         {0, 1, 2, 0,            /* 0xe4 */
1666                 {{2, 2},
1667                 {5, 7},
1668                 {0, 0},
1669                 {0, 0}
1670                 }
1671         },
1672         {1, 1, 3, 0,            /* 0xe5 */
1673                 {{0, 0},
1674                 {2, 2},
1675                 {5, 7},
1676                 {0, 0}
1677                 }
1678         },
1679         {0, 1, 2, 0,            /* 0xe6 */
1680                 {{1, 2},
1681                 {5, 7},
1682                 {0, 0},
1683                 {0, 0}
1684                 }
1685         },
1686         {1, 1, 2, 0,            /* 0xe7 */
1687                 {{0, 2},
1688                 {5, 7},
1689                 {0, 0},
1690                 {0, 0}
1691                 }
1692         },
1693         {0, 1, 2, 0,            /* 0xe8 */
1694                 {{3, 3},
1695                 {5, 7},
1696                 {0, 0},
1697                 {0, 0}
1698                 }
1699         },
1700         {1, 1, 3, 0,            /* 0xe9 */
1701                 {{0, 0},
1702                 {3, 3},
1703                 {5, 7},
1704                 {0, 0}
1705                 }
1706         },
1707         {0, 1, 3, 0,            /* 0xea */
1708                 {{1, 1},
1709                 {3, 3},
1710                 {5, 7},
1711                 {0, 0}
1712                 }
1713         },
1714         {1, 1, 3, 0,            /* 0xeb */
1715                 {{0, 1},
1716                 {3, 3},
1717                 {5, 7},
1718                 {0, 0}
1719                 }
1720         },
1721         {0, 1, 2, 0,            /* 0xec */
1722                 {{2, 3},
1723                 {5, 7},
1724                 {0, 0},
1725                 {0, 0}
1726                 }
1727         },
1728         {1, 1, 3, 0,            /* 0xed */
1729                 {{0, 0},
1730                 {2, 3},
1731                 {5, 7},
1732                 {0, 0}
1733                 }
1734         },
1735         {0, 1, 2, 0,            /* 0xee */
1736                 {{1, 3},
1737                 {5, 7},
1738                 {0, 0},
1739                 {0, 0}
1740                 }
1741         },
1742         {1, 1, 2, 0,            /* 0xef */
1743                 {{0, 3},
1744                 {5, 7},
1745                 {0, 0},
1746                 {0, 0}
1747                 }
1748         },
1749         {0, 1, 1, 0,            /* 0xf0 */
1750                 {{4, 7},
1751                 {0, 0},
1752                 {0, 0},
1753                 {0, 0}
1754                 }
1755         },
1756         {1, 1, 2, 0,            /* 0xf1 */
1757                 {{0, 0},
1758                 {4, 7},
1759                 {0, 0},
1760                 {0, 0}
1761                 }
1762         },
1763         {0, 1, 2, 0,            /* 0xf2 */
1764                 {{1, 1},
1765                 {4, 7},
1766                 {0, 0},
1767                 {0, 0}
1768                 }
1769         },
1770         {1, 1, 2, 0,            /* 0xf3 */
1771                 {{0, 1},
1772                 {4, 7},
1773                 {0, 0},
1774                 {0, 0}
1775                 }
1776         },
1777         {0, 1, 2, 0,            /* 0xf4 */
1778                 {{2, 2},
1779                 {4, 7},
1780                 {0, 0},
1781                 {0, 0}
1782                 }
1783         },
1784         {1, 1, 3, 0,            /* 0xf5 */
1785                 {{0, 0},
1786                 {2, 2},
1787                 {4, 7},
1788                 {0, 0}
1789                 }
1790         },
1791         {0, 1, 2, 0,            /* 0xf6 */
1792                 {{1, 2},
1793                 {4, 7},
1794                 {0, 0},
1795                 {0, 0}
1796                 }
1797         },
1798         {1, 1, 2, 0,            /* 0xf7 */
1799                 {{0, 2},
1800                 {4, 7},
1801                 {0, 0},
1802                 {0, 0}
1803                 }
1804         },
1805         {0, 1, 1, 0,            /* 0xf8 */
1806                 {{3, 7},
1807                 {0, 0},
1808                 {0, 0},
1809                 {0, 0}
1810                 }
1811         },
1812         {1, 1, 2, 0,            /* 0xf9 */
1813                 {{0, 0},
1814                 {3, 7},
1815                 {0, 0},
1816                 {0, 0}
1817                 }
1818         },
1819         {0, 1, 2, 0,            /* 0xfa */
1820                 {{1, 1},
1821                 {3, 7},
1822                 {0, 0},
1823                 {0, 0}
1824                 }
1825         },
1826         {1, 1, 2, 0,            /* 0xfb */
1827                 {{0, 1},
1828                 {3, 7},
1829                 {0, 0},
1830                 {0, 0}
1831                 }
1832         },
1833         {0, 1, 1, 0,            /* 0xfc */
1834                 {{2, 7},
1835                 {0, 0},
1836                 {0, 0},
1837                 {0, 0}
1838                 }
1839         },
1840         {1, 1, 2, 0,            /* 0xfd */
1841                 {{0, 0},
1842                 {2, 7},
1843                 {0, 0},
1844                 {0, 0}
1845                 }
1846         },
1847         {0, 1, 1, 0,            /* 0xfe */
1848                 {{1, 7},
1849                 {0, 0},
1850                 {0, 0},
1851                 {0, 0}
1852                 }
1853         },
1854         {1, 1, 1, 0,            /* 0xff */
1855                 {{0, 7},
1856                 {0, 0},
1857                 {0, 0},
1858                 {0, 0}
1859                 }
1860         }
1861 };
1862
1863
1864 int
1865 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1866     int ipv4_addr_legal,
1867     int ipv6_addr_legal,
1868     int loopback_scope,
1869     int ipv4_local_scope,
1870     int local_scope SCTP_UNUSED,/* XXX */
1871     int site_scope,
1872     int do_update)
1873 {
1874         if ((loopback_scope == 0) &&
1875             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876                 /*
1877                  * skip loopback if not in scope *
1878                  */
1879                 return (0);
1880         }
1881         switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883         case AF_INET:
1884                 if (ipv4_addr_legal) {
1885                         struct sockaddr_in *sin;
1886
1887                         sin = (struct sockaddr_in *)&ifa->address.sin;
1888                         if (sin->sin_addr.s_addr == 0) {
1889                                 /* not in scope , unspecified */
1890                                 return (0);
1891                         }
1892                         if ((ipv4_local_scope == 0) &&
1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894                                 /* private address not in scope */
1895                                 return (0);
1896                         }
1897                 } else {
1898                         return (0);
1899                 }
1900                 break;
1901 #endif
1902 #ifdef INET6
1903         case AF_INET6:
1904                 if (ipv6_addr_legal) {
1905                         struct sockaddr_in6 *sin6;
1906
1907                         /*
1908                          * Must update the flags,  bummer, which means any
1909                          * IFA locks must now be applied HERE <->
1910                          */
1911                         if (do_update) {
1912                                 sctp_gather_internal_ifa_flags(ifa);
1913                         }
1914                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915                                 return (0);
1916                         }
1917                         /* ok to use deprecated addresses? */
1918                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1919                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920                                 /* skip unspecifed addresses */
1921                                 return (0);
1922                         }
1923                         if (    /* (local_scope == 0) && */
1924                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925                                 return (0);
1926                         }
1927                         if ((site_scope == 0) &&
1928                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929                                 return (0);
1930                         }
1931                 } else {
1932                         return (0);
1933                 }
1934                 break;
1935 #endif
1936         default:
1937                 return (0);
1938         }
1939         return (1);
1940 }
1941
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1944 {
1945         struct sctp_paramhdr *parmh;
1946         struct mbuf *mret;
1947         int len;
1948
1949         switch (ifa->address.sa.sa_family) {
1950 #ifdef INET
1951         case AF_INET:
1952                 len = sizeof(struct sctp_ipv4addr_param);
1953                 break;
1954 #endif
1955 #ifdef INET6
1956         case AF_INET6:
1957                 len = sizeof(struct sctp_ipv6addr_param);
1958                 break;
1959 #endif
1960         default:
1961                 return (m);
1962         }
1963         if (M_TRAILINGSPACE(m) >= len) {
1964                 /* easy side we just drop it on the end */
1965                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 parmh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = (struct sockaddr_in *)&ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1991                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         parmh->param_length = htons(len);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += len;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2006                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         parmh->param_length = htons(len);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += len;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         return (mret);
2020 }
2021
2022
2023 struct mbuf *
2024 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2025     struct sctp_scoping *scope,
2026     struct mbuf *m_at, int cnt_inits_to)
2027 {
2028         struct sctp_vrf *vrf = NULL;
2029         int cnt, limit_out = 0, total_count;
2030         uint32_t vrf_id;
2031
2032         vrf_id = inp->def_vrf_id;
2033         SCTP_IPI_ADDR_RLOCK();
2034         vrf = sctp_find_vrf(vrf_id);
2035         if (vrf == NULL) {
2036                 SCTP_IPI_ADDR_RUNLOCK();
2037                 return (m_at);
2038         }
2039         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2040                 struct sctp_ifa *sctp_ifap;
2041                 struct sctp_ifn *sctp_ifnp;
2042
2043                 cnt = cnt_inits_to;
2044                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2045                         limit_out = 1;
2046                         cnt = SCTP_ADDRESS_LIMIT;
2047                         goto skip_count;
2048                 }
2049                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2050                         if ((scope->loopback_scope == 0) &&
2051                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2052                                 /*
2053                                  * Skip loopback devices if loopback_scope
2054                                  * not set
2055                                  */
2056                                 continue;
2057                         }
2058                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2059                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2060                                         continue;
2061                                 }
2062                                 if (sctp_is_address_in_scope(sctp_ifap,
2063                                     scope->ipv4_addr_legal,
2064                                     scope->ipv6_addr_legal,
2065                                     scope->loopback_scope,
2066                                     scope->ipv4_local_scope,
2067                                     scope->local_scope,
2068                                     scope->site_scope, 1) == 0) {
2069                                         continue;
2070                                 }
2071                                 cnt++;
2072                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2073                                         break;
2074                                 }
2075                         }
2076                         if (cnt > SCTP_ADDRESS_LIMIT) {
2077                                 break;
2078                         }
2079                 }
2080 skip_count:
2081                 if (cnt > 1) {
2082                         total_count = 0;
2083                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2084                                 cnt = 0;
2085                                 if ((scope->loopback_scope == 0) &&
2086                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2087                                         /*
2088                                          * Skip loopback devices if
2089                                          * loopback_scope not set
2090                                          */
2091                                         continue;
2092                                 }
2093                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2094                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2095                                                 continue;
2096                                         }
2097                                         if (sctp_is_address_in_scope(sctp_ifap,
2098                                             scope->ipv4_addr_legal,
2099                                             scope->ipv6_addr_legal,
2100                                             scope->loopback_scope,
2101                                             scope->ipv4_local_scope,
2102                                             scope->local_scope,
2103                                             scope->site_scope, 0) == 0) {
2104                                                 continue;
2105                                         }
2106                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2107                                         if (limit_out) {
2108                                                 cnt++;
2109                                                 total_count++;
2110                                                 if (cnt >= 2) {
2111                                                         /*
2112                                                          * two from each
2113                                                          * address
2114                                                          */
2115                                                         break;
2116                                                 }
2117                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2118                                                         /* No more addresses */
2119                                                         break;
2120                                                 }
2121                                         }
2122                                 }
2123                         }
2124                 }
2125         } else {
2126                 struct sctp_laddr *laddr;
2127
2128                 cnt = cnt_inits_to;
2129                 /* First, how many ? */
2130                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2131                         if (laddr->ifa == NULL) {
2132                                 continue;
2133                         }
2134                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2135                                 /*
2136                                  * Address being deleted by the system, dont
2137                                  * list.
2138                                  */
2139                                 continue;
2140                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2141                                 /*
2142                                  * Address being deleted on this ep don't
2143                                  * list.
2144                                  */
2145                                 continue;
2146                         }
2147                         if (sctp_is_address_in_scope(laddr->ifa,
2148                             scope->ipv4_addr_legal,
2149                             scope->ipv6_addr_legal,
2150                             scope->loopback_scope,
2151                             scope->ipv4_local_scope,
2152                             scope->local_scope,
2153                             scope->site_scope, 1) == 0) {
2154                                 continue;
2155                         }
2156                         cnt++;
2157                 }
2158                 /*
2159                  * To get through a NAT we only list addresses if we have
2160                  * more than one. That way if you just bind a single address
2161                  * we let the source of the init dictate our address.
2162                  */
2163                 if (cnt > 1) {
2164                         cnt = cnt_inits_to;
2165                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2166                                 if (laddr->ifa == NULL) {
2167                                         continue;
2168                                 }
2169                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2170                                         continue;
2171                                 }
2172                                 if (sctp_is_address_in_scope(laddr->ifa,
2173                                     scope->ipv4_addr_legal,
2174                                     scope->ipv6_addr_legal,
2175                                     scope->loopback_scope,
2176                                     scope->ipv4_local_scope,
2177                                     scope->local_scope,
2178                                     scope->site_scope, 0) == 0) {
2179                                         continue;
2180                                 }
2181                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2182                                 cnt++;
2183                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2184                                         break;
2185                                 }
2186                         }
2187                 }
2188         }
2189         SCTP_IPI_ADDR_RUNLOCK();
2190         return (m_at);
2191 }
2192
2193 static struct sctp_ifa *
2194 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2195     uint8_t dest_is_loop,
2196     uint8_t dest_is_priv,
2197     sa_family_t fam)
2198 {
2199         uint8_t dest_is_global = 0;
2200
2201         /* dest_is_priv is true if destination is a private address */
2202         /* dest_is_loop is true if destination is a loopback addresses */
2203
2204         /**
2205          * Here we determine if its a preferred address. A preferred address
2206          * means it is the same scope or higher scope then the destination.
2207          * L = loopback, P = private, G = global
2208          * -----------------------------------------
2209          *    src    |  dest | result
2210          *  ----------------------------------------
2211          *     L     |    L  |    yes
2212          *  -----------------------------------------
2213          *     P     |    L  |    yes-v4 no-v6
2214          *  -----------------------------------------
2215          *     G     |    L  |    yes-v4 no-v6
2216          *  -----------------------------------------
2217          *     L     |    P  |    no
2218          *  -----------------------------------------
2219          *     P     |    P  |    yes
2220          *  -----------------------------------------
2221          *     G     |    P  |    no
2222          *   -----------------------------------------
2223          *     L     |    G  |    no
2224          *   -----------------------------------------
2225          *     P     |    G  |    no
2226          *    -----------------------------------------
2227          *     G     |    G  |    yes
2228          *    -----------------------------------------
2229          */
2230
2231         if (ifa->address.sa.sa_family != fam) {
2232                 /* forget mis-matched family */
2233                 return (NULL);
2234         }
2235         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2236                 dest_is_global = 1;
2237         }
2238         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2239         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2240         /* Ok the address may be ok */
2241 #ifdef INET6
2242         if (fam == AF_INET6) {
2243                 /* ok to use deprecated addresses? no lets not! */
2244                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2245                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2246                         return (NULL);
2247                 }
2248                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2249                         if (dest_is_loop) {
2250                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2251                                 return (NULL);
2252                         }
2253                 }
2254                 if (ifa->src_is_glob) {
2255                         if (dest_is_loop) {
2256                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2257                                 return (NULL);
2258                         }
2259                 }
2260         }
2261 #endif
2262         /*
2263          * Now that we know what is what, implement or table this could in
2264          * theory be done slicker (it used to be), but this is
2265          * straightforward and easier to validate :-)
2266          */
2267         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2268             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2269         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2270             dest_is_loop, dest_is_priv, dest_is_global);
2271
2272         if ((ifa->src_is_loop) && (dest_is_priv)) {
2273                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2274                 return (NULL);
2275         }
2276         if ((ifa->src_is_glob) && (dest_is_priv)) {
2277                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2278                 return (NULL);
2279         }
2280         if ((ifa->src_is_loop) && (dest_is_global)) {
2281                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2282                 return (NULL);
2283         }
2284         if ((ifa->src_is_priv) && (dest_is_global)) {
2285                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2286                 return (NULL);
2287         }
2288         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2289         /* its a preferred address */
2290         return (ifa);
2291 }
2292
2293 static struct sctp_ifa *
2294 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2295     uint8_t dest_is_loop,
2296     uint8_t dest_is_priv,
2297     sa_family_t fam)
2298 {
2299         uint8_t dest_is_global = 0;
2300
2301         /**
2302          * Here we determine if its a acceptable address. A acceptable
2303          * address means it is the same scope or higher scope but we can
2304          * allow for NAT which means its ok to have a global dest and a
2305          * private src.
2306          *
2307          * L = loopback, P = private, G = global
2308          * -----------------------------------------
2309          *  src    |  dest | result
2310          * -----------------------------------------
2311          *   L     |   L   |    yes
2312          *  -----------------------------------------
2313          *   P     |   L   |    yes-v4 no-v6
2314          *  -----------------------------------------
2315          *   G     |   L   |    yes
2316          * -----------------------------------------
2317          *   L     |   P   |    no
2318          * -----------------------------------------
2319          *   P     |   P   |    yes
2320          * -----------------------------------------
2321          *   G     |   P   |    yes - May not work
2322          * -----------------------------------------
2323          *   L     |   G   |    no
2324          * -----------------------------------------
2325          *   P     |   G   |    yes - May not work
2326          * -----------------------------------------
2327          *   G     |   G   |    yes
2328          * -----------------------------------------
2329          */
2330
2331         if (ifa->address.sa.sa_family != fam) {
2332                 /* forget non matching family */
2333                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2334                     ifa->address.sa.sa_family, fam);
2335                 return (NULL);
2336         }
2337         /* Ok the address may be ok */
2338         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2339         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2340             dest_is_loop, dest_is_priv);
2341         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2342                 dest_is_global = 1;
2343         }
2344 #ifdef INET6
2345         if (fam == AF_INET6) {
2346                 /* ok to use deprecated addresses? */
2347                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2348                         return (NULL);
2349                 }
2350                 if (ifa->src_is_priv) {
2351                         /* Special case, linklocal to loop */
2352                         if (dest_is_loop)
2353                                 return (NULL);
2354                 }
2355         }
2356 #endif
2357         /*
2358          * Now that we know what is what, implement our table. This could in
2359          * theory be done slicker (it used to be), but this is
2360          * straightforward and easier to validate :-)
2361          */
2362         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2363             ifa->src_is_loop,
2364             dest_is_priv);
2365         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2366                 return (NULL);
2367         }
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2369             ifa->src_is_loop,
2370             dest_is_global);
2371         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2372                 return (NULL);
2373         }
2374         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2375         /* its an acceptable address */
2376         return (ifa);
2377 }
2378
2379 int
2380 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2381 {
2382         struct sctp_laddr *laddr;
2383
2384         if (stcb == NULL) {
2385                 /* There are no restrictions, no TCB :-) */
2386                 return (0);
2387         }
2388         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2389                 if (laddr->ifa == NULL) {
2390                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2391                             __FUNCTION__);
2392                         continue;
2393                 }
2394                 if (laddr->ifa == ifa) {
2395                         /* Yes it is on the list */
2396                         return (1);
2397                 }
2398         }
2399         return (0);
2400 }
2401
2402
2403 int
2404 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2405 {
2406         struct sctp_laddr *laddr;
2407
2408         if (ifa == NULL)
2409                 return (0);
2410         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2411                 if (laddr->ifa == NULL) {
2412                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2413                             __FUNCTION__);
2414                         continue;
2415                 }
2416                 if ((laddr->ifa == ifa) && laddr->action == 0)
2417                         /* same pointer */
2418                         return (1);
2419         }
2420         return (0);
2421 }
2422
2423
2424
2425 static struct sctp_ifa *
2426 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2427     sctp_route_t * ro,
2428     uint32_t vrf_id,
2429     int non_asoc_addr_ok,
2430     uint8_t dest_is_priv,
2431     uint8_t dest_is_loop,
2432     sa_family_t fam)
2433 {
2434         struct sctp_laddr *laddr, *starting_point;
2435         void *ifn;
2436         int resettotop = 0;
2437         struct sctp_ifn *sctp_ifn;
2438         struct sctp_ifa *sctp_ifa, *sifa;
2439         struct sctp_vrf *vrf;
2440         uint32_t ifn_index;
2441
2442         vrf = sctp_find_vrf(vrf_id);
2443         if (vrf == NULL)
2444                 return (NULL);
2445
2446         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2447         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2448         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2449         /*
2450          * first question, is the ifn we will emit on in our list, if so, we
2451          * want such an address. Note that we first looked for a preferred
2452          * address.
2453          */
2454         if (sctp_ifn) {
2455                 /* is a preferred one on the interface we route out? */
2456                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2457                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2458                             (non_asoc_addr_ok == 0))
2459                                 continue;
2460                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2461                             dest_is_loop,
2462                             dest_is_priv, fam);
2463                         if (sifa == NULL)
2464                                 continue;
2465                         if (sctp_is_addr_in_ep(inp, sifa)) {
2466                                 atomic_add_int(&sifa->refcount, 1);
2467                                 return (sifa);
2468                         }
2469                 }
2470         }
2471         /*
2472          * ok, now we now need to find one on the list of the addresses. We
2473          * can't get one on the emitting interface so let's find first a
2474          * preferred one. If not that an acceptable one otherwise... we
2475          * return NULL.
2476          */
2477         starting_point = inp->next_addr_touse;
2478 once_again:
2479         if (inp->next_addr_touse == NULL) {
2480                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2481                 resettotop = 1;
2482         }
2483         for (laddr = inp->next_addr_touse; laddr;
2484             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2485                 if (laddr->ifa == NULL) {
2486                         /* address has been removed */
2487                         continue;
2488                 }
2489                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2490                         /* address is being deleted */
2491                         continue;
2492                 }
2493                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2494                     dest_is_priv, fam);
2495                 if (sifa == NULL)
2496                         continue;
2497                 atomic_add_int(&sifa->refcount, 1);
2498                 return (sifa);
2499         }
2500         if (resettotop == 0) {
2501                 inp->next_addr_touse = NULL;
2502                 goto once_again;
2503         }
2504         inp->next_addr_touse = starting_point;
2505         resettotop = 0;
2506 once_again_too:
2507         if (inp->next_addr_touse == NULL) {
2508                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2509                 resettotop = 1;
2510         }
2511         /* ok, what about an acceptable address in the inp */
2512         for (laddr = inp->next_addr_touse; laddr;
2513             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2514                 if (laddr->ifa == NULL) {
2515                         /* address has been removed */
2516                         continue;
2517                 }
2518                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2519                         /* address is being deleted */
2520                         continue;
2521                 }
2522                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2523                     dest_is_priv, fam);
2524                 if (sifa == NULL)
2525                         continue;
2526                 atomic_add_int(&sifa->refcount, 1);
2527                 return (sifa);
2528         }
2529         if (resettotop == 0) {
2530                 inp->next_addr_touse = NULL;
2531                 goto once_again_too;
2532         }
2533         /*
2534          * no address bound can be a source for the destination we are in
2535          * trouble
2536          */
2537         return (NULL);
2538 }
2539
2540
2541
2542 static struct sctp_ifa *
2543 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2544     struct sctp_tcb *stcb,
2545     sctp_route_t * ro,
2546     uint32_t vrf_id,
2547     uint8_t dest_is_priv,
2548     uint8_t dest_is_loop,
2549     int non_asoc_addr_ok,
2550     sa_family_t fam)
2551 {
2552         struct sctp_laddr *laddr, *starting_point;
2553         void *ifn;
2554         struct sctp_ifn *sctp_ifn;
2555         struct sctp_ifa *sctp_ifa, *sifa;
2556         uint8_t start_at_beginning = 0;
2557         struct sctp_vrf *vrf;
2558         uint32_t ifn_index;
2559
2560         /*
2561          * first question, is the ifn we will emit on in our list, if so, we
2562          * want that one.
2563          */
2564         vrf = sctp_find_vrf(vrf_id);
2565         if (vrf == NULL)
2566                 return (NULL);
2567
2568         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2569         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2570         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2571
2572         /*
2573          * first question, is the ifn we will emit on in our list?  If so,
2574          * we want that one. First we look for a preferred. Second, we go
2575          * for an acceptable.
2576          */
2577         if (sctp_ifn) {
2578                 /* first try for a preferred address on the ep */
2579                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2580                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2581                                 continue;
2582                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2583                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2584                                 if (sifa == NULL)
2585                                         continue;
2586                                 if (((non_asoc_addr_ok == 0) &&
2587                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2588                                     (non_asoc_addr_ok &&
2589                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2590                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2591                                         /* on the no-no list */
2592                                         continue;
2593                                 }
2594                                 atomic_add_int(&sifa->refcount, 1);
2595                                 return (sifa);
2596                         }
2597                 }
2598                 /* next try for an acceptable address on the ep */
2599                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2600                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2601                                 continue;
2602                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2603                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2604                                 if (sifa == NULL)
2605                                         continue;
2606                                 if (((non_asoc_addr_ok == 0) &&
2607                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2608                                     (non_asoc_addr_ok &&
2609                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2610                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2611                                         /* on the no-no list */
2612                                         continue;
2613                                 }
2614                                 atomic_add_int(&sifa->refcount, 1);
2615                                 return (sifa);
2616                         }
2617                 }
2618
2619         }
2620         /*
2621          * if we can't find one like that then we must look at all addresses
2622          * bound to pick one at first preferable then secondly acceptable.
2623          */
2624         starting_point = stcb->asoc.last_used_address;
2625 sctp_from_the_top:
2626         if (stcb->asoc.last_used_address == NULL) {
2627                 start_at_beginning = 1;
2628                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2629         }
2630         /* search beginning with the last used address */
2631         for (laddr = stcb->asoc.last_used_address; laddr;
2632             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2633                 if (laddr->ifa == NULL) {
2634                         /* address has been removed */
2635                         continue;
2636                 }
2637                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2638                         /* address is being deleted */
2639                         continue;
2640                 }
2641                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2642                 if (sifa == NULL)
2643                         continue;
2644                 if (((non_asoc_addr_ok == 0) &&
2645                     (sctp_is_addr_restricted(stcb, sifa))) ||
2646                     (non_asoc_addr_ok &&
2647                     (sctp_is_addr_restricted(stcb, sifa)) &&
2648                     (!sctp_is_addr_pending(stcb, sifa)))) {
2649                         /* on the no-no list */
2650                         continue;
2651                 }
2652                 stcb->asoc.last_used_address = laddr;
2653                 atomic_add_int(&sifa->refcount, 1);
2654                 return (sifa);
2655         }
2656         if (start_at_beginning == 0) {
2657                 stcb->asoc.last_used_address = NULL;
2658                 goto sctp_from_the_top;
2659         }
2660         /* now try for any higher scope than the destination */
2661         stcb->asoc.last_used_address = starting_point;
2662         start_at_beginning = 0;
2663 sctp_from_the_top2:
2664         if (stcb->asoc.last_used_address == NULL) {
2665                 start_at_beginning = 1;
2666                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2667         }
2668         /* search beginning with the last used address */
2669         for (laddr = stcb->asoc.last_used_address; laddr;
2670             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2671                 if (laddr->ifa == NULL) {
2672                         /* address has been removed */
2673                         continue;
2674                 }
2675                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2676                         /* address is being deleted */
2677                         continue;
2678                 }
2679                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2680                     dest_is_priv, fam);
2681                 if (sifa == NULL)
2682                         continue;
2683                 if (((non_asoc_addr_ok == 0) &&
2684                     (sctp_is_addr_restricted(stcb, sifa))) ||
2685                     (non_asoc_addr_ok &&
2686                     (sctp_is_addr_restricted(stcb, sifa)) &&
2687                     (!sctp_is_addr_pending(stcb, sifa)))) {
2688                         /* on the no-no list */
2689                         continue;
2690                 }
2691                 stcb->asoc.last_used_address = laddr;
2692                 atomic_add_int(&sifa->refcount, 1);
2693                 return (sifa);
2694         }
2695         if (start_at_beginning == 0) {
2696                 stcb->asoc.last_used_address = NULL;
2697                 goto sctp_from_the_top2;
2698         }
2699         return (NULL);
2700 }
2701
2702 static struct sctp_ifa *
2703 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2704     struct sctp_tcb *stcb,
2705     int non_asoc_addr_ok,
2706     uint8_t dest_is_loop,
2707     uint8_t dest_is_priv,
2708     int addr_wanted,
2709     sa_family_t fam,
2710     sctp_route_t * ro
2711 )
2712 {
2713         struct sctp_ifa *ifa, *sifa;
2714         int num_eligible_addr = 0;
2715
2716 #ifdef INET6
2717         struct sockaddr_in6 sin6, lsa6;
2718
2719         if (fam == AF_INET6) {
2720                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2721                 (void)sa6_recoverscope(&sin6);
2722         }
2723 #endif                          /* INET6 */
2724         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2725                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2726                     (non_asoc_addr_ok == 0))
2727                         continue;
2728                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2729                     dest_is_priv, fam);
2730                 if (sifa == NULL)
2731                         continue;
2732 #ifdef INET6
2733                 if (fam == AF_INET6 &&
2734                     dest_is_loop &&
2735                     sifa->src_is_loop && sifa->src_is_priv) {
2736                         /*
2737                          * don't allow fe80::1 to be a src on loop ::1, we
2738                          * don't list it to the peer so we will get an
2739                          * abort.
2740                          */
2741                         continue;
2742                 }
2743                 if (fam == AF_INET6 &&
2744                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2745                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2746                         /*
2747                          * link-local <-> link-local must belong to the same
2748                          * scope.
2749                          */
2750                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2751                         (void)sa6_recoverscope(&lsa6);
2752                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2753                                 continue;
2754                         }
2755                 }
2756 #endif                          /* INET6 */
2757
2758                 /*
2759                  * Check if the IPv6 address matches to next-hop. In the
2760                  * mobile case, old IPv6 address may be not deleted from the
2761                  * interface. Then, the interface has previous and new
2762                  * addresses.  We should use one corresponding to the
2763                  * next-hop.  (by micchie)
2764                  */
2765 #ifdef INET6
2766                 if (stcb && fam == AF_INET6 &&
2767                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2768                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2769                             == 0) {
2770                                 continue;
2771                         }
2772                 }
2773 #endif
2774 #ifdef INET
2775                 /* Avoid topologically incorrect IPv4 address */
2776                 if (stcb && fam == AF_INET &&
2777                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2778                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2779                                 continue;
2780                         }
2781                 }
2782 #endif
2783                 if (stcb) {
2784                         if (sctp_is_address_in_scope(ifa,
2785                             stcb->asoc.ipv4_addr_legal,
2786                             stcb->asoc.ipv6_addr_legal,
2787                             stcb->asoc.loopback_scope,
2788                             stcb->asoc.ipv4_local_scope,
2789                             stcb->asoc.local_scope,
2790                             stcb->asoc.site_scope, 0) == 0) {
2791                                 continue;
2792                         }
2793                         if (((non_asoc_addr_ok == 0) &&
2794                             (sctp_is_addr_restricted(stcb, sifa))) ||
2795                             (non_asoc_addr_ok &&
2796                             (sctp_is_addr_restricted(stcb, sifa)) &&
2797                             (!sctp_is_addr_pending(stcb, sifa)))) {
2798                                 /*
2799                                  * It is restricted for some reason..
2800                                  * probably not yet added.
2801                                  */
2802                                 continue;
2803                         }
2804                 }
2805                 if (num_eligible_addr >= addr_wanted) {
2806                         return (sifa);
2807                 }
2808                 num_eligible_addr++;
2809         }
2810         return (NULL);
2811 }
2812
2813
2814 static int
2815 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2816     struct sctp_tcb *stcb,
2817     int non_asoc_addr_ok,
2818     uint8_t dest_is_loop,
2819     uint8_t dest_is_priv,
2820     sa_family_t fam)
2821 {
2822         struct sctp_ifa *ifa, *sifa;
2823         int num_eligible_addr = 0;
2824
2825         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2826                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2827                     (non_asoc_addr_ok == 0)) {
2828                         continue;
2829                 }
2830                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2831                     dest_is_priv, fam);
2832                 if (sifa == NULL) {
2833                         continue;
2834                 }
2835                 if (stcb) {
2836                         if (sctp_is_address_in_scope(ifa,
2837                             stcb->asoc.ipv4_addr_legal,
2838                             stcb->asoc.ipv6_addr_legal,
2839                             stcb->asoc.loopback_scope,
2840                             stcb->asoc.ipv4_local_scope,
2841                             stcb->asoc.local_scope,
2842                             stcb->asoc.site_scope, 0) == 0) {
2843                                 continue;
2844                         }
2845                         if (((non_asoc_addr_ok == 0) &&
2846                             (sctp_is_addr_restricted(stcb, sifa))) ||
2847                             (non_asoc_addr_ok &&
2848                             (sctp_is_addr_restricted(stcb, sifa)) &&
2849                             (!sctp_is_addr_pending(stcb, sifa)))) {
2850                                 /*
2851                                  * It is restricted for some reason..
2852                                  * probably not yet added.
2853                                  */
2854                                 continue;
2855                         }
2856                 }
2857                 num_eligible_addr++;
2858         }
2859         return (num_eligible_addr);
2860 }
2861
2862 static struct sctp_ifa *
2863 sctp_choose_boundall(struct sctp_tcb *stcb,
2864     struct sctp_nets *net,
2865     sctp_route_t * ro,
2866     uint32_t vrf_id,
2867     uint8_t dest_is_priv,
2868     uint8_t dest_is_loop,
2869     int non_asoc_addr_ok,
2870     sa_family_t fam)
2871 {
2872         int cur_addr_num = 0, num_preferred = 0;
2873         void *ifn;
2874         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2875         struct sctp_ifa *sctp_ifa, *sifa;
2876         uint32_t ifn_index;
2877         struct sctp_vrf *vrf;
2878
2879 #ifdef INET
2880         int retried = 0;
2881
2882 #endif
2883
2884         /*-
2885          * For boundall we can use any address in the association.
2886          * If non_asoc_addr_ok is set we can use any address (at least in
2887          * theory). So we look for preferred addresses first. If we find one,
2888          * we use it. Otherwise we next try to get an address on the
2889          * interface, which we should be able to do (unless non_asoc_addr_ok
2890          * is false and we are routed out that way). In these cases where we
2891          * can't use the address of the interface we go through all the
2892          * ifn's looking for an address we can use and fill that in. Punting
2893          * means we send back address 0, which will probably cause problems
2894          * actually since then IP will fill in the address of the route ifn,
2895          * which means we probably already rejected it.. i.e. here comes an
2896          * abort :-<.
2897          */
2898         vrf = sctp_find_vrf(vrf_id);
2899         if (vrf == NULL)
2900                 return (NULL);
2901
2902         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2903         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2904         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2905         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2906         if (sctp_ifn == NULL) {
2907                 /* ?? We don't have this guy ?? */
2908                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2909                 goto bound_all_plan_b;
2910         }
2911         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2912             ifn_index, sctp_ifn->ifn_name);
2913
2914         if (net) {
2915                 cur_addr_num = net->indx_of_eligible_next_to_use;
2916         }
2917         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2918             stcb,
2919             non_asoc_addr_ok,
2920             dest_is_loop,
2921             dest_is_priv, fam);
2922         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2923             num_preferred, sctp_ifn->ifn_name);
2924         if (num_preferred == 0) {
2925                 /*
2926                  * no eligible addresses, we must use some other interface
2927                  * address if we can find one.
2928                  */
2929                 goto bound_all_plan_b;
2930         }
2931         /*
2932          * Ok we have num_eligible_addr set with how many we can use, this
2933          * may vary from call to call due to addresses being deprecated
2934          * etc..
2935          */
2936         if (cur_addr_num >= num_preferred) {
2937                 cur_addr_num = 0;
2938         }
2939         /*
2940          * select the nth address from the list (where cur_addr_num is the
2941          * nth) and 0 is the first one, 1 is the second one etc...
2942          */
2943         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2944
2945         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2946             dest_is_priv, cur_addr_num, fam, ro);
2947
2948         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2949         if (sctp_ifa) {
2950                 atomic_add_int(&sctp_ifa->refcount, 1);
2951                 if (net) {
2952                         /* save off where the next one we will want */
2953                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2954                 }
2955                 return (sctp_ifa);
2956         }
2957         /*
2958          * plan_b: Look at all interfaces and find a preferred address. If
2959          * no preferred fall through to plan_c.
2960          */
2961 bound_all_plan_b:
2962         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2963         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2964                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2965                     sctp_ifn->ifn_name);
2966                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2967                         /* wrong base scope */
2968                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2969                         continue;
2970                 }
2971                 if ((sctp_ifn == looked_at) && looked_at) {
2972                         /* already looked at this guy */
2973                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2974                         continue;
2975                 }
2976                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2977                     dest_is_loop, dest_is_priv, fam);
2978                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2979                     "Found ifn:%p %d preferred source addresses\n",
2980                     ifn, num_preferred);
2981                 if (num_preferred == 0) {
2982                         /* None on this interface. */
2983                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2984                         continue;
2985                 }
2986                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2987                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2988                     num_preferred, sctp_ifn, cur_addr_num);
2989
2990                 /*
2991                  * Ok we have num_eligible_addr set with how many we can
2992                  * use, this may vary from call to call due to addresses
2993                  * being deprecated etc..
2994                  */
2995                 if (cur_addr_num >= num_preferred) {
2996                         cur_addr_num = 0;
2997                 }
2998                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2999                     dest_is_priv, cur_addr_num, fam, ro);
3000                 if (sifa == NULL)
3001                         continue;
3002                 if (net) {
3003                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3004                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3005                             cur_addr_num);
3006                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3007                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3008                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3009                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3010                 }
3011                 atomic_add_int(&sifa->refcount, 1);
3012                 return (sifa);
3013         }
3014 #ifdef INET
3015 again_with_private_addresses_allowed:
3016 #endif
3017         /* plan_c: do we have an acceptable address on the emit interface */
3018         sifa = NULL;
3019         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3020         if (emit_ifn == NULL) {
3021                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3022                 goto plan_d;
3023         }
3024         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3025                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", sctp_ifa);
3026                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3027                     (non_asoc_addr_ok == 0)) {
3028                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3029                         continue;
3030                 }
3031                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3032                     dest_is_priv, fam);
3033                 if (sifa == NULL) {
3034                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3035                         continue;
3036                 }
3037                 if (stcb) {
3038                         if (sctp_is_address_in_scope(sifa,
3039                             stcb->asoc.ipv4_addr_legal,
3040                             stcb->asoc.ipv6_addr_legal,
3041                             stcb->asoc.loopback_scope,
3042                             stcb->asoc.ipv4_local_scope,
3043                             stcb->asoc.local_scope,
3044                             stcb->asoc.site_scope, 0) == 0) {
3045                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3046                                 sifa = NULL;
3047                                 continue;
3048                         }
3049                         if (((non_asoc_addr_ok == 0) &&
3050                             (sctp_is_addr_restricted(stcb, sifa))) ||
3051                             (non_asoc_addr_ok &&
3052                             (sctp_is_addr_restricted(stcb, sifa)) &&
3053                             (!sctp_is_addr_pending(stcb, sifa)))) {
3054                                 /*
3055                                  * It is restricted for some reason..
3056                                  * probably not yet added.
3057                                  */
3058                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3059                                 sifa = NULL;
3060                                 continue;
3061                         }
3062                 } else {
3063                         SCTP_PRINTF("Stcb is null - no print\n");
3064                 }
3065                 atomic_add_int(&sifa->refcount, 1);
3066                 goto out;
3067         }
3068 plan_d:
3069         /*
3070          * plan_d: We are in trouble. No preferred address on the emit
3071          * interface. And not even a preferred address on all interfaces. Go
3072          * out and see if we can find an acceptable address somewhere
3073          * amongst all interfaces.
3074          */
3075         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", looked_at);
3076         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3077                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3078                         /* wrong base scope */
3079                         continue;
3080                 }
3081                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3082                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3083                             (non_asoc_addr_ok == 0))
3084                                 continue;
3085                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3086                             dest_is_loop,
3087                             dest_is_priv, fam);
3088                         if (sifa == NULL)
3089                                 continue;
3090                         if (stcb) {
3091                                 if (sctp_is_address_in_scope(sifa,
3092                                     stcb->asoc.ipv4_addr_legal,
3093                                     stcb->asoc.ipv6_addr_legal,
3094                                     stcb->asoc.loopback_scope,
3095                                     stcb->asoc.ipv4_local_scope,
3096                                     stcb->asoc.local_scope,
3097                                     stcb->asoc.site_scope, 0) == 0) {
3098                                         sifa = NULL;
3099                                         continue;
3100                                 }
3101                                 if (((non_asoc_addr_ok == 0) &&
3102                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3103                                     (non_asoc_addr_ok &&
3104                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3105                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3106                                         /*
3107                                          * It is restricted for some
3108                                          * reason.. probably not yet added.
3109                                          */
3110                                         sifa = NULL;
3111                                         continue;
3112                                 }
3113                         }
3114                         goto out;
3115                 }
3116         }
3117 #ifdef INET
3118         if ((retried == 0) && (stcb->asoc.ipv4_local_scope == 0)) {
3119                 stcb->asoc.ipv4_local_scope = 1;
3120                 retried = 1;
3121                 goto again_with_private_addresses_allowed;
3122         } else if (retried == 1) {
3123                 stcb->asoc.ipv4_local_scope = 0;
3124         }
3125 #endif
3126 out:
3127 #ifdef INET
3128         if (sifa) {
3129                 if (retried == 1) {
3130                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3131                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3132                                         /* wrong base scope */
3133                                         continue;
3134                                 }
3135                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3136                                         struct sctp_ifa *tmp_sifa;
3137
3138                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3139                                             (non_asoc_addr_ok == 0))
3140                                                 continue;
3141                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3142                                             dest_is_loop,
3143                                             dest_is_priv, fam);
3144                                         if (tmp_sifa == NULL) {
3145                                                 continue;
3146                                         }
3147                                         if (tmp_sifa == sifa) {
3148                                                 continue;
3149                                         }
3150                                         if (stcb) {
3151                                                 if (sctp_is_address_in_scope(tmp_sifa,
3152                                                     stcb->asoc.ipv4_addr_legal,
3153                                                     stcb->asoc.ipv6_addr_legal,
3154                                                     stcb->asoc.loopback_scope,
3155                                                     stcb->asoc.ipv4_local_scope,
3156                                                     stcb->asoc.local_scope,
3157                                                     stcb->asoc.site_scope, 0) == 0) {
3158                                                         continue;
3159                                                 }
3160                                                 if (((non_asoc_addr_ok == 0) &&
3161                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3162                                                     (non_asoc_addr_ok &&
3163                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3164                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3165                                                         /*
3166                                                          * It is restricted
3167                                                          * for some reason..
3168                                                          * probably not yet
3169                                                          * added.
3170                                                          */
3171                                                         continue;
3172                                                 }
3173                                         }
3174                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3175                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3176                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3177                                         }
3178                                 }
3179                         }
3180                 }
3181                 atomic_add_int(&sifa->refcount, 1);
3182         }
3183 #endif
3184         return (sifa);
3185 }
3186
3187
3188
3189 /* tcb may be NULL */
3190 struct sctp_ifa *
3191 sctp_source_address_selection(struct sctp_inpcb *inp,
3192     struct sctp_tcb *stcb,
3193     sctp_route_t * ro,
3194     struct sctp_nets *net,
3195     int non_asoc_addr_ok, uint32_t vrf_id)
3196 {
3197         struct sctp_ifa *answer;
3198         uint8_t dest_is_priv, dest_is_loop;
3199         sa_family_t fam;
3200
3201 #ifdef INET
3202         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3203
3204 #endif
3205 #ifdef INET6
3206         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3207
3208 #endif
3209
3210         /**
3211          * Rules: - Find the route if needed, cache if I can. - Look at
3212          * interface address in route, Is it in the bound list. If so we
3213          * have the best source. - If not we must rotate amongst the
3214          * addresses.
3215          *
3216          * Cavets and issues
3217          *
3218          * Do we need to pay attention to scope. We can have a private address
3219          * or a global address we are sourcing or sending to. So if we draw
3220          * it out
3221          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3222          * For V4
3223          * ------------------------------------------
3224          *      source     *      dest  *  result
3225          * -----------------------------------------
3226          * <a>  Private    *    Global  *  NAT
3227          * -----------------------------------------
3228          * <b>  Private    *    Private *  No problem
3229          * -----------------------------------------
3230          * <c>  Global     *    Private *  Huh, How will this work?
3231          * -----------------------------------------
3232          * <d>  Global     *    Global  *  No Problem
3233          *------------------------------------------
3234          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3235          * For V6
3236          *------------------------------------------
3237          *      source     *      dest  *  result
3238          * -----------------------------------------
3239          * <a>  Linklocal  *    Global  *
3240          * -----------------------------------------
3241          * <b>  Linklocal  * Linklocal  *  No problem
3242          * -----------------------------------------
3243          * <c>  Global     * Linklocal  *  Huh, How will this work?
3244          * -----------------------------------------
3245          * <d>  Global     *    Global  *  No Problem
3246          *------------------------------------------
3247          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3248          *
3249          * And then we add to that what happens if there are multiple addresses
3250          * assigned to an interface. Remember the ifa on a ifn is a linked
3251          * list of addresses. So one interface can have more than one IP
3252          * address. What happens if we have both a private and a global
3253          * address? Do we then use context of destination to sort out which
3254          * one is best? And what about NAT's sending P->G may get you a NAT
3255          * translation, or should you select the G thats on the interface in
3256          * preference.
3257          *
3258          * Decisions:
3259          *
3260          * - count the number of addresses on the interface.
3261          * - if it is one, no problem except case <c>.
3262          *   For <a> we will assume a NAT out there.
3263          * - if there are more than one, then we need to worry about scope P
3264          *   or G. We should prefer G -> G and P -> P if possible.
3265          *   Then as a secondary fall back to mixed types G->P being a last
3266          *   ditch one.
3267          * - The above all works for bound all, but bound specific we need to
3268          *   use the same concept but instead only consider the bound
3269          *   addresses. If the bound set is NOT assigned to the interface then
3270          *   we must use rotation amongst the bound addresses..
3271          */
3272         if (ro->ro_rt == NULL) {
3273                 /*
3274                  * Need a route to cache.
3275                  */
3276                 SCTP_RTALLOC(ro, vrf_id);
3277         }
3278         if (ro->ro_rt == NULL) {
3279                 return (NULL);
3280         }
3281         fam = ro->ro_dst.sa_family;
3282         dest_is_priv = dest_is_loop = 0;
3283         /* Setup our scopes for the destination */
3284         switch (fam) {
3285 #ifdef INET
3286         case AF_INET:
3287                 /* Scope based on outbound address */
3288                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3289                         dest_is_loop = 1;
3290                         if (net != NULL) {
3291                                 /* mark it as local */
3292                                 net->addr_is_local = 1;
3293                         }
3294                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3295                         dest_is_priv = 1;
3296                 }
3297                 break;
3298 #endif
3299 #ifdef INET6
3300         case AF_INET6:
3301                 /* Scope based on outbound address */
3302                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3303                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3304                         /*
3305                          * If the address is a loopback address, which
3306                          * consists of "::1" OR "fe80::1%lo0", we are
3307                          * loopback scope. But we don't use dest_is_priv
3308                          * (link local addresses).
3309                          */
3310                         dest_is_loop = 1;
3311                         if (net != NULL) {
3312                                 /* mark it as local */
3313                                 net->addr_is_local = 1;
3314                         }
3315                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3316                         dest_is_priv = 1;
3317                 }
3318                 break;
3319 #endif
3320         }
3321         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3322         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3323         SCTP_IPI_ADDR_RLOCK();
3324         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3325                 /*
3326                  * Bound all case
3327                  */
3328                 answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3329                     dest_is_priv, dest_is_loop,
3330                     non_asoc_addr_ok, fam);
3331                 SCTP_IPI_ADDR_RUNLOCK();
3332                 return (answer);
3333         }
3334         /*
3335          * Subset bound case
3336          */
3337         if (stcb) {
3338                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3339                     vrf_id, dest_is_priv,
3340                     dest_is_loop,
3341                     non_asoc_addr_ok, fam);
3342         } else {
3343                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3344                     non_asoc_addr_ok,
3345                     dest_is_priv,
3346                     dest_is_loop, fam);
3347         }
3348         SCTP_IPI_ADDR_RUNLOCK();
3349         return (answer);
3350 }
3351
3352 static int
3353 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3354 {
3355         struct cmsghdr cmh;
3356         int tlen, at, found;
3357         struct sctp_sndinfo sndinfo;
3358         struct sctp_prinfo prinfo;
3359         struct sctp_authinfo authinfo;
3360
3361         tlen = SCTP_BUF_LEN(control);
3362         at = 0;
3363         found = 0;
3364         /*
3365          * Independent of how many mbufs, find the c_type inside the control
3366          * structure and copy out the data.
3367          */
3368         while (at < tlen) {
3369                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3370                         /* There is not enough room for one more. */
3371                         return (found);
3372                 }
3373                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3374                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3375                         /* We dont't have a complete CMSG header. */
3376                         return (found);
3377                 }
3378                 if (((int)cmh.cmsg_len + at) > tlen) {
3379                         /* We don't have the complete CMSG. */
3380                         return (found);
3381                 }
3382                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3383                     ((c_type == cmh.cmsg_type) ||
3384                     ((c_type == SCTP_SNDRCV) &&
3385                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3386                     (cmh.cmsg_type == SCTP_PRINFO) ||
3387                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3388                         if (c_type == cmh.cmsg_type) {
3389                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3390                                         return (found);
3391                                 }
3392                                 /* It is exactly what we want. Copy it out. */
3393                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), cpsize, (caddr_t)data);
3394                                 return (1);
3395                         } else {
3396                                 struct sctp_sndrcvinfo *sndrcvinfo;
3397
3398                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3399                                 if (found == 0) {
3400                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3401                                                 return (found);
3402                                         }
3403                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3404                                 }
3405                                 switch (cmh.cmsg_type) {
3406                                 case SCTP_SNDINFO:
3407                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_sndinfo)) {
3408                                                 return (found);
3409                                         }
3410                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3411                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3412                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3413                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3414                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3415                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3416                                         break;
3417                                 case SCTP_PRINFO:
3418                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_prinfo)) {
3419                                                 return (found);
3420                                         }
3421                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3422                                         sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3423                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3424                                         break;
3425                                 case SCTP_AUTHINFO:
3426                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_authinfo)) {
3427                                                 return (found);
3428                                         }
3429                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3430                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3431                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3432                                         break;
3433                                 default:
3434                                         return (found);
3435                                 }
3436                                 found = 1;
3437                         }
3438                 }
3439                 at += CMSG_ALIGN(cmh.cmsg_len);
3440         }
3441         return (found);
3442 }
3443
3444 static int
3445 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3446 {
3447         struct cmsghdr cmh;
3448         int tlen, at;
3449         struct sctp_initmsg initmsg;
3450
3451 #ifdef INET
3452         struct sockaddr_in sin;
3453
3454 #endif
3455 #ifdef INET6
3456         struct sockaddr_in6 sin6;
3457
3458 #endif
3459
3460         tlen = SCTP_BUF_LEN(control);
3461         at = 0;
3462         while (at < tlen) {
3463                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3464                         /* There is not enough room for one more. */
3465                         *error = EINVAL;
3466                         return (1);
3467                 }
3468                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3469                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3470                         /* We dont't have a complete CMSG header. */
3471                         *error = EINVAL;
3472                         return (1);
3473                 }
3474                 if (((int)cmh.cmsg_len + at) > tlen) {
3475                         /* We don't have the complete CMSG. */
3476                         *error = EINVAL;
3477                         return (1);
3478                 }
3479                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3480                         switch (cmh.cmsg_type) {
3481                         case SCTP_INIT:
3482                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_initmsg)) {
3483                                         *error = EINVAL;
3484                                         return (1);
3485                                 }
3486                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3487                                 if (initmsg.sinit_max_attempts)
3488                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3489                                 if (initmsg.sinit_num_ostreams)
3490                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3491                                 if (initmsg.sinit_max_instreams)
3492                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3493                                 if (initmsg.sinit_max_init_timeo)
3494                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3495                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3496                                         struct sctp_stream_out *tmp_str;
3497                                         unsigned int i;
3498
3499                                         /* Default is NOT correct */
3500                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3501                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3502                                         SCTP_TCB_UNLOCK(stcb);
3503                                         SCTP_MALLOC(tmp_str,
3504                                             struct sctp_stream_out *,
3505                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3506                                             SCTP_M_STRMO);
3507                                         SCTP_TCB_LOCK(stcb);
3508                                         if (tmp_str != NULL) {
3509                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3510                                                 stcb->asoc.strmout = tmp_str;
3511                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3512                                         } else {
3513                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3514                                         }
3515                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3516                                                 stcb->asoc.strmout[i].next_sequence_sent = 0;
3517                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3518                                                 stcb->asoc.strmout[i].stream_no = i;
3519                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3520                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3521                                         }
3522                                 }
3523                                 break;
3524 #ifdef INET
3525                         case SCTP_DSTADDRV4:
3526                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3527                                         *error = EINVAL;
3528                                         return (1);
3529                                 }
3530                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3531                                 sin.sin_family = AF_INET;
3532                                 sin.sin_len = sizeof(struct sockaddr_in);
3533                                 sin.sin_port = stcb->rport;
3534                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3535                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3536                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3537                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3538                                         *error = EINVAL;
3539                                         return (1);
3540                                 }
3541                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3542                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3543                                         *error = ENOBUFS;
3544                                         return (1);
3545                                 }
3546                                 break;
3547 #endif
3548 #ifdef INET6
3549                         case SCTP_DSTADDRV6:
3550                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3551                                         *error = EINVAL;
3552                                         return (1);
3553                                 }
3554                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3555                                 sin6.sin6_family = AF_INET6;
3556                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3557                                 sin6.sin6_port = stcb->rport;
3558                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3559                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3560                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3561                                         *error = EINVAL;
3562                                         return (1);
3563                                 }
3564 #ifdef INET
3565                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3566                                         in6_sin6_2_sin(&sin, &sin6);
3567                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3568                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3569                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3570                                                 *error = EINVAL;
3571                                                 return (1);
3572                                         }
3573                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3574                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3575                                                 *error = ENOBUFS;
3576                                                 return (1);
3577                                         }
3578                                 } else
3579 #endif
3580                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3581                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3582                                         *error = ENOBUFS;
3583                                         return (1);
3584                                 }
3585                                 break;
3586 #endif
3587                         default:
3588                                 break;
3589                         }
3590                 }
3591                 at += CMSG_ALIGN(cmh.cmsg_len);
3592         }
3593         return (0);
3594 }
3595
3596 static struct sctp_tcb *
3597 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3598     in_port_t port,
3599     struct mbuf *control,
3600     struct sctp_nets **net_p,
3601     int *error)
3602 {
3603         struct cmsghdr cmh;
3604         int tlen, at;
3605         struct sctp_tcb *stcb;
3606         struct sockaddr *addr;
3607
3608 #ifdef INET
3609         struct sockaddr_in sin;
3610
3611 #endif
3612 #ifdef INET6
3613         struct sockaddr_in6 sin6;
3614
3615 #endif
3616
3617         tlen = SCTP_BUF_LEN(control);
3618         at = 0;
3619         while (at < tlen) {
3620                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3621                         /* There is not enough room for one more. */
3622                         *error = EINVAL;
3623                         return (NULL);
3624                 }
3625                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3626                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3627                         /* We dont't have a complete CMSG header. */
3628                         *error = EINVAL;
3629                         return (NULL);
3630                 }
3631                 if (((int)cmh.cmsg_len + at) > tlen) {
3632                         /* We don't have the complete CMSG. */
3633                         *error = EINVAL;
3634                         return (NULL);
3635                 }
3636                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3637                         switch (cmh.cmsg_type) {
3638 #ifdef INET
3639                         case SCTP_DSTADDRV4:
3640                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3641                                         *error = EINVAL;
3642                                         return (NULL);
3643                                 }
3644                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3645                                 sin.sin_family = AF_INET;
3646                                 sin.sin_len = sizeof(struct sockaddr_in);
3647                                 sin.sin_port = port;
3648                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3649                                 addr = (struct sockaddr *)&sin;
3650                                 break;
3651 #endif
3652 #ifdef INET6
3653                         case SCTP_DSTADDRV6:
3654                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3655                                         *error = EINVAL;
3656                                         return (NULL);
3657                                 }
3658                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3659                                 sin6.sin6_family = AF_INET6;
3660                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3661                                 sin6.sin6_port = port;
3662                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3663 #ifdef INET
3664                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3665                                         in6_sin6_2_sin(&sin, &sin6);
3666                                         addr = (struct sockaddr *)&sin;
3667                                 } else
3668 #endif
3669                                         addr = (struct sockaddr *)&sin6;
3670                                 break;
3671 #endif
3672                         default:
3673                                 addr = NULL;
3674                                 break;
3675                         }
3676                         if (addr) {
3677                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3678                                 if (stcb != NULL) {
3679                                         return (stcb);
3680                                 }
3681                         }
3682                 }
3683                 at += CMSG_ALIGN(cmh.cmsg_len);
3684         }
3685         return (NULL);
3686 }
3687
3688 static struct mbuf *
3689 sctp_add_cookie(struct mbuf *init, int init_offset,
3690     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3691 {
3692         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3693         struct sctp_state_cookie *stc;
3694         struct sctp_paramhdr *ph;
3695         uint8_t *foo;
3696         int sig_offset;
3697         uint16_t cookie_sz;
3698
3699         mret = NULL;
3700         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3701             sizeof(struct sctp_paramhdr)), 0,
3702             M_DONTWAIT, 1, MT_DATA);
3703         if (mret == NULL) {
3704                 return (NULL);
3705         }
3706         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3707         if (copy_init == NULL) {
3708                 sctp_m_freem(mret);
3709                 return (NULL);
3710         }
3711 #ifdef SCTP_MBUF_LOGGING
3712         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3713                 struct mbuf *mat;
3714
3715                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3716                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3717                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3718                         }
3719                 }
3720         }
3721 #endif
3722         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3723             M_DONTWAIT);
3724         if (copy_initack == NULL) {
3725                 sctp_m_freem(mret);
3726                 sctp_m_freem(copy_init);
3727                 return (NULL);
3728         }
3729 #ifdef SCTP_MBUF_LOGGING
3730         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3731                 struct mbuf *mat;
3732
3733                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3734                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3735                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3736                         }
3737                 }
3738         }
3739 #endif
3740         /* easy side we just drop it on the end */
3741         ph = mtod(mret, struct sctp_paramhdr *);
3742         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3743             sizeof(struct sctp_paramhdr);
3744         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3745             sizeof(struct sctp_paramhdr));
3746         ph->param_type = htons(SCTP_STATE_COOKIE);
3747         ph->param_length = 0;   /* fill in at the end */
3748         /* Fill in the stc cookie data */
3749         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3750
3751         /* tack the INIT and then the INIT-ACK onto the chain */
3752         cookie_sz = 0;
3753         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3754                 cookie_sz += SCTP_BUF_LEN(m_at);
3755                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3756                         SCTP_BUF_NEXT(m_at) = copy_init;
3757                         break;
3758                 }
3759         }
3760         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3761                 cookie_sz += SCTP_BUF_LEN(m_at);
3762                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3763                         SCTP_BUF_NEXT(m_at) = copy_initack;
3764                         break;
3765                 }
3766         }
3767         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3768                 cookie_sz += SCTP_BUF_LEN(m_at);
3769                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3770                         break;
3771                 }
3772         }
3773         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3774         if (sig == NULL) {
3775                 /* no space, so free the entire chain */
3776                 sctp_m_freem(mret);
3777                 return (NULL);
3778         }
3779         SCTP_BUF_LEN(sig) = 0;
3780         SCTP_BUF_NEXT(m_at) = sig;
3781         sig_offset = 0;
3782         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3783         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3784         *signature = foo;
3785         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3786         cookie_sz += SCTP_SIGNATURE_SIZE;
3787         ph->param_length = htons(cookie_sz);
3788         return (mret);
3789 }
3790
3791
3792 static uint8_t
3793 sctp_get_ect(struct sctp_tcb *stcb)
3794 {
3795         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3796                 return (SCTP_ECT0_BIT);
3797         } else {
3798                 return (0);
3799         }
3800 }
3801
3802 static void
3803 sctp_handle_no_route(struct sctp_tcb *stcb,
3804     struct sctp_nets *net,
3805     int so_locked)
3806 {
3807         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3808
3809         if (net) {
3810                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3811                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3812                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3813                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3814                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
3815                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3816                                     stcb, 0,
3817                                     (void *)net,
3818                                     so_locked);
3819                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3820                                 net->dest_state &= ~SCTP_ADDR_PF;
3821                         }
3822                 }
3823                 if (stcb) {
3824                         if (net == stcb->asoc.primary_destination) {
3825                                 /* need a new primary */
3826                                 struct sctp_nets *alt;
3827
3828                                 alt = sctp_find_alternate_net(stcb, net, 0);
3829                                 if (alt != net) {
3830                                         if (stcb->asoc.alternate) {
3831                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3832                                         }
3833                                         stcb->asoc.alternate = alt;
3834                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3835                                         if (net->ro._s_addr) {
3836                                                 sctp_free_ifa(net->ro._s_addr);
3837                                                 net->ro._s_addr = NULL;
3838                                         }
3839                                         net->src_addr_selected = 0;
3840                                 }
3841                         }
3842                 }
3843         }
3844 }
3845
3846 static int
3847 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3848     struct sctp_tcb *stcb,      /* may be NULL */
3849     struct sctp_nets *net,
3850     struct sockaddr *to,
3851     struct mbuf *m,
3852     uint32_t auth_offset,
3853     struct sctp_auth_chunk *auth,
3854     uint16_t auth_keyid,
3855     int nofragment_flag,
3856     int ecn_ok,
3857     int out_of_asoc_ok,
3858     uint16_t src_port,
3859     uint16_t dest_port,
3860     uint32_t v_tag,
3861     uint16_t port,
3862     union sctp_sockstore *over_addr,
3863     uint8_t use_mflowid, uint32_t mflowid,
3864 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3865     int so_locked SCTP_UNUSED
3866 #else
3867     int so_locked
3868 #endif
3869 )
3870 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3871 {
3872         /**
3873          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3874          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3875          * - fill in the HMAC digest of any AUTH chunk in the packet.
3876          * - calculate and fill in the SCTP checksum.
3877          * - prepend an IP address header.
3878          * - if boundall use INADDR_ANY.
3879          * - if boundspecific do source address selection.
3880          * - set fragmentation option for ipV4.
3881          * - On return from IP output, check/adjust mtu size of output
3882          *   interface and smallest_mtu size as well.
3883          */
3884         /* Will need ifdefs around this */
3885         struct mbuf *o_pak;
3886         struct mbuf *newm;
3887         struct sctphdr *sctphdr;
3888         int packet_length;
3889         int ret;
3890         uint32_t vrf_id;
3891         sctp_route_t *ro = NULL;
3892         struct udphdr *udp = NULL;
3893         uint8_t tos_value;
3894
3895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3896         struct socket *so = NULL;
3897
3898 #endif
3899
3900         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3901                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3902                 sctp_m_freem(m);
3903                 return (EFAULT);
3904         }
3905         if (stcb) {
3906                 vrf_id = stcb->asoc.vrf_id;
3907         } else {
3908                 vrf_id = inp->def_vrf_id;
3909         }
3910
3911         /* fill in the HMAC digest for any AUTH chunk in the packet */
3912         if ((auth != NULL) && (stcb != NULL)) {
3913                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3914         }
3915         if (net) {
3916                 tos_value = net->dscp;
3917         } else if (stcb) {
3918                 tos_value = stcb->asoc.default_dscp;
3919         } else {
3920                 tos_value = inp->sctp_ep.default_dscp;
3921         }
3922
3923         switch (to->sa_family) {
3924 #ifdef INET
3925         case AF_INET:
3926                 {
3927                         struct ip *ip = NULL;
3928                         sctp_route_t iproute;
3929                         int len;
3930
3931                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3932                         if (port) {
3933                                 len += sizeof(struct udphdr);
3934                         }
3935                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3936                         if (newm == NULL) {
3937                                 sctp_m_freem(m);
3938                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3939                                 return (ENOMEM);
3940                         }
3941                         SCTP_ALIGN_TO_END(newm, len);
3942                         SCTP_BUF_LEN(newm) = len;
3943                         SCTP_BUF_NEXT(newm) = m;
3944                         m = newm;
3945                         if (net != NULL) {
3946 #ifdef INVARIANTS
3947                                 if (net->flowidset == 0) {
3948                                         panic("Flow ID not set");
3949                                 }
3950 #endif
3951                                 m->m_pkthdr.flowid = net->flowid;
3952                                 m->m_flags |= M_FLOWID;
3953                         } else {
3954                                 if (use_mflowid != 0) {
3955                                         m->m_pkthdr.flowid = mflowid;
3956                                         m->m_flags |= M_FLOWID;
3957                                 }
3958                         }
3959                         packet_length = sctp_calculate_len(m);
3960                         ip = mtod(m, struct ip *);
3961                         ip->ip_v = IPVERSION;
3962                         ip->ip_hl = (sizeof(struct ip) >> 2);
3963                         if (tos_value == 0) {
3964                                 /*
3965                                  * This means especially, that it is not set
3966                                  * at the SCTP layer. So use the value from
3967                                  * the IP layer.
3968                                  */
3969                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3970                         }
3971                         tos_value &= 0xfc;
3972                         if (ecn_ok) {
3973                                 tos_value |= sctp_get_ect(stcb);
3974                         }
3975                         if ((nofragment_flag) && (port == 0)) {
3976                                 ip->ip_off = IP_DF;
3977                         } else
3978                                 ip->ip_off = 0;
3979
3980                         /* FreeBSD has a function for ip_id's */
3981                         ip->ip_id = ip_newid();
3982
3983                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3984                         ip->ip_len = packet_length;
3985                         ip->ip_tos = tos_value;
3986                         if (port) {
3987                                 ip->ip_p = IPPROTO_UDP;
3988                         } else {
3989                                 ip->ip_p = IPPROTO_SCTP;
3990                         }
3991                         ip->ip_sum = 0;
3992                         if (net == NULL) {
3993                                 ro = &iproute;
3994                                 memset(&iproute, 0, sizeof(iproute));
3995                                 memcpy(&ro->ro_dst, to, to->sa_len);
3996                         } else {
3997                                 ro = (sctp_route_t *) & net->ro;
3998                         }
3999                         /* Now the address selection part */
4000                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4001
4002                         /* call the routine to select the src address */
4003                         if (net && out_of_asoc_ok == 0) {
4004                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4005                                         sctp_free_ifa(net->ro._s_addr);
4006                                         net->ro._s_addr = NULL;
4007                                         net->src_addr_selected = 0;
4008                                         if (ro->ro_rt) {
4009                                                 RTFREE(ro->ro_rt);
4010                                                 ro->ro_rt = NULL;
4011                                         }
4012                                 }
4013                                 if (net->src_addr_selected == 0) {
4014                                         /* Cache the source address */
4015                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4016                                             ro, net, 0,
4017                                             vrf_id);
4018                                         net->src_addr_selected = 1;
4019                                 }
4020                                 if (net->ro._s_addr == NULL) {
4021                                         /* No route to host */
4022                                         net->src_addr_selected = 0;
4023                                         sctp_handle_no_route(stcb, net, so_locked);
4024                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4025                                         sctp_m_freem(m);
4026                                         return (EHOSTUNREACH);
4027                                 }
4028                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4029                         } else {
4030                                 if (over_addr == NULL) {
4031                                         struct sctp_ifa *_lsrc;
4032
4033                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4034                                             net,
4035                                             out_of_asoc_ok,
4036                                             vrf_id);
4037                                         if (_lsrc == NULL) {
4038                                                 sctp_handle_no_route(stcb, net, so_locked);
4039                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4040                                                 sctp_m_freem(m);
4041                                                 return (EHOSTUNREACH);
4042                                         }
4043                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4044                                         sctp_free_ifa(_lsrc);
4045                                 } else {
4046                                         ip->ip_src = over_addr->sin.sin_addr;
4047                                         SCTP_RTALLOC(ro, vrf_id);
4048                                 }
4049                         }
4050                         if (port) {
4051                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4052                                         sctp_handle_no_route(stcb, net, so_locked);
4053                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4054                                         sctp_m_freem(m);
4055                                         return (EHOSTUNREACH);
4056                                 }
4057                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4058                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4059                                 udp->uh_dport = port;
4060                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4061                                 if (V_udp_cksum) {
4062                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4063                                 } else {
4064                                         udp->uh_sum = 0;
4065                                 }
4066                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4067                         } else {
4068                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4069                         }
4070
4071                         sctphdr->src_port = src_port;
4072                         sctphdr->dest_port = dest_port;
4073                         sctphdr->v_tag = v_tag;
4074                         sctphdr->checksum = 0;
4075
4076                         /*
4077                          * If source address selection fails and we find no
4078                          * route then the ip_output should fail as well with
4079                          * a NO_ROUTE_TO_HOST type error. We probably should
4080                          * catch that somewhere and abort the association
4081                          * right away (assuming this is an INIT being sent).
4082                          */
4083                         if (ro->ro_rt == NULL) {
4084                                 /*
4085                                  * src addr selection failed to find a route
4086                                  * (or valid source addr), so we can't get
4087                                  * there from here (yet)!
4088                                  */
4089                                 sctp_handle_no_route(stcb, net, so_locked);
4090                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4091                                 sctp_m_freem(m);
4092                                 return (EHOSTUNREACH);
4093                         }
4094                         if (ro != &iproute) {
4095                                 memcpy(&iproute, ro, sizeof(*ro));
4096                         }
4097                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4098                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4099                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4100                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4101                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4102                             ro->ro_rt);
4103
4104                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4105                                 /* failed to prepend data, give up */
4106                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4107                                 sctp_m_freem(m);
4108                                 return (ENOMEM);
4109                         }
4110                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4111                         if (port) {
4112 #if defined(SCTP_WITH_NO_CSUM)
4113                                 SCTP_STAT_INCR(sctps_sendnocrc);
4114 #else
4115                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4116                                 SCTP_STAT_INCR(sctps_sendswcrc);
4117 #endif
4118                                 if (V_udp_cksum) {
4119                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4120                                 }
4121                         } else {
4122 #if defined(SCTP_WITH_NO_CSUM)
4123                                 SCTP_STAT_INCR(sctps_sendnocrc);
4124 #else
4125                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4126                                 m->m_pkthdr.csum_data = 0;
4127                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4128 #endif
4129                         }
4130 #ifdef SCTP_PACKET_LOGGING
4131                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4132                                 sctp_packet_log(o_pak);
4133 #endif
4134                         /* send it out.  table id is taken from stcb */
4135 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4136                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4137                                 so = SCTP_INP_SO(inp);
4138                                 SCTP_SOCKET_UNLOCK(so, 0);
4139                         }
4140 #endif
4141                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4142 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4143                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4144                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4145                                 SCTP_TCB_UNLOCK(stcb);
4146                                 SCTP_SOCKET_LOCK(so, 0);
4147                                 SCTP_TCB_LOCK(stcb);
4148                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4149                         }
4150 #endif
4151                         SCTP_STAT_INCR(sctps_sendpackets);
4152                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4153                         if (ret)
4154                                 SCTP_STAT_INCR(sctps_senderrors);
4155
4156                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4157                         if (net == NULL) {
4158                                 /* free tempy routes */
4159                                 if (ro->ro_rt) {
4160                                         RTFREE(ro->ro_rt);
4161                                         ro->ro_rt = NULL;
4162                                 }
4163                         } else {
4164                                 /*
4165                                  * PMTU check versus smallest asoc MTU goes
4166                                  * here
4167                                  */
4168                                 if ((ro->ro_rt != NULL) &&
4169                                     (net->ro._s_addr)) {
4170                                         uint32_t mtu;
4171
4172                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4173                                         if (net->port) {
4174                                                 mtu -= sizeof(struct udphdr);
4175                                         }
4176                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4177                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4178                                                 net->mtu = mtu;
4179                                         }
4180                                 } else if (ro->ro_rt == NULL) {
4181                                         /* route was freed */
4182                                         if (net->ro._s_addr &&
4183                                             net->src_addr_selected) {
4184                                                 sctp_free_ifa(net->ro._s_addr);
4185                                                 net->ro._s_addr = NULL;
4186                                         }
4187                                         net->src_addr_selected = 0;
4188                                 }
4189                         }
4190                         return (ret);
4191                 }
4192 #endif
4193 #ifdef INET6
4194         case AF_INET6:
4195                 {
4196                         uint32_t flowlabel, flowinfo;
4197                         struct ip6_hdr *ip6h;
4198                         struct route_in6 ip6route;
4199                         struct ifnet *ifp;
4200                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4201                         int prev_scope = 0;
4202                         struct sockaddr_in6 lsa6_storage;
4203                         int error;
4204                         u_short prev_port = 0;
4205                         int len;
4206
4207                         if (net) {
4208                                 flowlabel = net->flowlabel;
4209                         } else if (stcb) {
4210                                 flowlabel = stcb->asoc.default_flowlabel;
4211                         } else {
4212                                 flowlabel = inp->sctp_ep.default_flowlabel;
4213                         }
4214                         if (flowlabel == 0) {
4215                                 /*
4216                                  * This means especially, that it is not set
4217                                  * at the SCTP layer. So use the value from
4218                                  * the IP layer.
4219                                  */
4220                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4221                         }
4222                         flowlabel &= 0x000fffff;
4223                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4224                         if (port) {
4225                                 len += sizeof(struct udphdr);
4226                         }
4227                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4228                         if (newm == NULL) {
4229                                 sctp_m_freem(m);
4230                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4231                                 return (ENOMEM);
4232                         }
4233                         SCTP_ALIGN_TO_END(newm, len);
4234                         SCTP_BUF_LEN(newm) = len;
4235                         SCTP_BUF_NEXT(newm) = m;
4236                         m = newm;
4237                         if (net != NULL) {
4238 #ifdef INVARIANTS
4239                                 if (net->flowidset == 0) {
4240                                         panic("Flow ID not set");
4241                                 }
4242 #endif
4243                                 m->m_pkthdr.flowid = net->flowid;
4244                                 m->m_flags |= M_FLOWID;
4245                         } else {
4246                                 if (use_mflowid != 0) {
4247                                         m->m_pkthdr.flowid = mflowid;
4248                                         m->m_flags |= M_FLOWID;
4249                                 }
4250                         }
4251                         packet_length = sctp_calculate_len(m);
4252
4253                         ip6h = mtod(m, struct ip6_hdr *);
4254                         /* protect *sin6 from overwrite */
4255                         sin6 = (struct sockaddr_in6 *)to;
4256                         tmp = *sin6;
4257                         sin6 = &tmp;
4258
4259                         /* KAME hack: embed scopeid */
4260                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4261                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4262                                 return (EINVAL);
4263                         }
4264                         if (net == NULL) {
4265                                 memset(&ip6route, 0, sizeof(ip6route));
4266                                 ro = (sctp_route_t *) & ip6route;
4267                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4268                         } else {
4269                                 ro = (sctp_route_t *) & net->ro;
4270                         }
4271                         /*
4272                          * We assume here that inp_flow is in host byte
4273                          * order within the TCB!
4274                          */
4275                         if (tos_value == 0) {
4276                                 /*
4277                                  * This means especially, that it is not set
4278                                  * at the SCTP layer. So use the value from
4279                                  * the IP layer.
4280                                  */
4281                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4282                         }
4283                         tos_value &= 0xfc;
4284                         if (ecn_ok) {
4285                                 tos_value |= sctp_get_ect(stcb);
4286                         }
4287                         flowinfo = 0x06;
4288                         flowinfo <<= 8;
4289                         flowinfo |= tos_value;
4290                         flowinfo <<= 20;
4291                         flowinfo |= flowlabel;
4292                         ip6h->ip6_flow = htonl(flowinfo);
4293                         if (port) {
4294                                 ip6h->ip6_nxt = IPPROTO_UDP;
4295                         } else {
4296                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4297                         }
4298                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4299                         ip6h->ip6_dst = sin6->sin6_addr;
4300
4301                         /*
4302                          * Add SRC address selection here: we can only reuse
4303                          * to a limited degree the kame src-addr-sel, since
4304                          * we can try their selection but it may not be
4305                          * bound.
4306                          */
4307                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4308                         lsa6_tmp.sin6_family = AF_INET6;
4309                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4310                         lsa6 = &lsa6_tmp;
4311                         if (net && out_of_asoc_ok == 0) {
4312                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4313                                         sctp_free_ifa(net->ro._s_addr);
4314                                         net->ro._s_addr = NULL;
4315                                         net->src_addr_selected = 0;
4316                                         if (ro->ro_rt) {
4317                                                 RTFREE(ro->ro_rt);
4318                                                 ro->ro_rt = NULL;
4319                                         }
4320                                 }
4321                                 if (net->src_addr_selected == 0) {
4322                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4323                                         /* KAME hack: embed scopeid */
4324                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4325                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4326                                                 return (EINVAL);
4327                                         }
4328                                         /* Cache the source address */
4329                                         net->ro._s_addr = sctp_source_address_selection(inp,
4330                                             stcb,
4331                                             ro,
4332                                             net,
4333                                             0,
4334                                             vrf_id);
4335                                         (void)sa6_recoverscope(sin6);
4336                                         net->src_addr_selected = 1;
4337                                 }
4338                                 if (net->ro._s_addr == NULL) {
4339                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4340                                         net->src_addr_selected = 0;
4341                                         sctp_handle_no_route(stcb, net, so_locked);
4342                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4343                                         sctp_m_freem(m);
4344                                         return (EHOSTUNREACH);
4345                                 }
4346                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4347                         } else {
4348                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4349                                 /* KAME hack: embed scopeid */
4350                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4351                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4352                                         return (EINVAL);
4353                                 }
4354                                 if (over_addr == NULL) {
4355                                         struct sctp_ifa *_lsrc;
4356
4357                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4358                                             net,
4359                                             out_of_asoc_ok,
4360                                             vrf_id);
4361                                         if (_lsrc == NULL) {
4362                                                 sctp_handle_no_route(stcb, net, so_locked);
4363                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4364                                                 sctp_m_freem(m);
4365                                                 return (EHOSTUNREACH);
4366                                         }
4367                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4368                                         sctp_free_ifa(_lsrc);
4369                                 } else {
4370                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4371                                         SCTP_RTALLOC(ro, vrf_id);
4372                                 }
4373                                 (void)sa6_recoverscope(sin6);
4374                         }
4375                         lsa6->sin6_port = inp->sctp_lport;
4376
4377                         if (ro->ro_rt == NULL) {
4378                                 /*
4379                                  * src addr selection failed to find a route
4380                                  * (or valid source addr), so we can't get
4381                                  * there from here!
4382                                  */
4383                                 sctp_handle_no_route(stcb, net, so_locked);
4384                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4385                                 sctp_m_freem(m);
4386                                 return (EHOSTUNREACH);
4387                         }
4388                         /*
4389                          * XXX: sa6 may not have a valid sin6_scope_id in
4390                          * the non-SCOPEDROUTING case.
4391                          */
4392                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4393                         lsa6_storage.sin6_family = AF_INET6;
4394                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4395                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4396                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4397                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4398                                 sctp_m_freem(m);
4399                                 return (error);
4400                         }
4401                         /* XXX */
4402                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4403                         lsa6_storage.sin6_port = inp->sctp_lport;
4404                         lsa6 = &lsa6_storage;
4405                         ip6h->ip6_src = lsa6->sin6_addr;
4406
4407                         if (port) {
4408                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4409                                         sctp_handle_no_route(stcb, net, so_locked);
4410                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4411                                         sctp_m_freem(m);
4412                                         return (EHOSTUNREACH);
4413                                 }
4414                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4415                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4416                                 udp->uh_dport = port;
4417                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4418                                 udp->uh_sum = 0;
4419                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4420                         } else {
4421                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4422                         }
4423
4424                         sctphdr->src_port = src_port;
4425                         sctphdr->dest_port = dest_port;
4426                         sctphdr->v_tag = v_tag;
4427                         sctphdr->checksum = 0;
4428
4429                         /*
4430                          * We set the hop limit now since there is a good
4431                          * chance that our ro pointer is now filled
4432                          */
4433                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4434                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4435
4436 #ifdef SCTP_DEBUG
4437                         /* Copy to be sure something bad is not happening */
4438                         sin6->sin6_addr = ip6h->ip6_dst;
4439                         lsa6->sin6_addr = ip6h->ip6_src;
4440 #endif
4441
4442                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4443                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4444                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4445                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4446                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4447                         if (net) {
4448                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4449                                 /*
4450                                  * preserve the port and scope for link
4451                                  * local send
4452                                  */
4453                                 prev_scope = sin6->sin6_scope_id;
4454                                 prev_port = sin6->sin6_port;
4455                         }
4456                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4457                                 /* failed to prepend data, give up */
4458                                 sctp_m_freem(m);
4459                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4460                                 return (ENOMEM);
4461                         }
4462                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4463                         if (port) {
4464 #if defined(SCTP_WITH_NO_CSUM)
4465                                 SCTP_STAT_INCR(sctps_sendnocrc);
4466 #else
4467                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4468                                 SCTP_STAT_INCR(sctps_sendswcrc);
4469 #endif
4470                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4471                                         udp->uh_sum = 0xffff;
4472                                 }
4473                         } else {
4474 #if defined(SCTP_WITH_NO_CSUM)
4475                                 SCTP_STAT_INCR(sctps_sendnocrc);
4476 #else
4477                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4478                                 m->m_pkthdr.csum_data = 0;
4479                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4480 #endif
4481                         }
4482                         /* send it out. table id is taken from stcb */
4483 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4484                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4485                                 so = SCTP_INP_SO(inp);
4486                                 SCTP_SOCKET_UNLOCK(so, 0);
4487                         }
4488 #endif
4489 #ifdef SCTP_PACKET_LOGGING
4490                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4491                                 sctp_packet_log(o_pak);
4492 #endif
4493                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4494 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4495                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4496                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4497                                 SCTP_TCB_UNLOCK(stcb);
4498                                 SCTP_SOCKET_LOCK(so, 0);
4499                                 SCTP_TCB_LOCK(stcb);
4500                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4501                         }
4502 #endif
4503                         if (net) {
4504                                 /* for link local this must be done */
4505                                 sin6->sin6_scope_id = prev_scope;
4506                                 sin6->sin6_port = prev_port;
4507                         }
4508                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4509                         SCTP_STAT_INCR(sctps_sendpackets);
4510                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4511                         if (ret) {
4512                                 SCTP_STAT_INCR(sctps_senderrors);
4513                         }
4514                         if (net == NULL) {
4515                                 /* Now if we had a temp route free it */
4516                                 if (ro->ro_rt) {
4517                                         RTFREE(ro->ro_rt);
4518                                 }
4519                         } else {
4520                                 /*
4521                                  * PMTU check versus smallest asoc MTU goes
4522                                  * here
4523                                  */
4524                                 if (ro->ro_rt == NULL) {
4525                                         /* Route was freed */
4526                                         if (net->ro._s_addr &&
4527                                             net->src_addr_selected) {
4528                                                 sctp_free_ifa(net->ro._s_addr);
4529                                                 net->ro._s_addr = NULL;
4530                                         }
4531                                         net->src_addr_selected = 0;
4532                                 }
4533                                 if ((ro->ro_rt != NULL) &&
4534                                     (net->ro._s_addr)) {
4535                                         uint32_t mtu;
4536
4537                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4538                                         if (mtu &&
4539                                             (stcb->asoc.smallest_mtu > mtu)) {
4540                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4541                                                 net->mtu = mtu;
4542                                                 if (net->port) {
4543                                                         net->mtu -= sizeof(struct udphdr);
4544                                                 }
4545                                         }
4546                                 } else if (ifp) {
4547                                         if (ND_IFINFO(ifp)->linkmtu &&
4548                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4549                                                 sctp_mtu_size_reset(inp,
4550                                                     &stcb->asoc,
4551                                                     ND_IFINFO(ifp)->linkmtu);
4552                                         }
4553                                 }
4554                         }
4555                         return (ret);
4556                 }
4557 #endif
4558         default:
4559                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4560                     ((struct sockaddr *)to)->sa_family);
4561                 sctp_m_freem(m);
4562                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4563                 return (EFAULT);
4564         }
4565 }
4566
4567
4568 void
4569 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4570 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4571     SCTP_UNUSED
4572 #endif
4573 )
4574 {
4575         struct mbuf *m, *m_at, *mp_last;
4576         struct sctp_nets *net;
4577         struct sctp_init_chunk *init;
4578         struct sctp_supported_addr_param *sup_addr;
4579         struct sctp_adaptation_layer_indication *ali;
4580         struct sctp_ecn_supported_param *ecn;
4581         struct sctp_prsctp_supported_param *prsctp;
4582         struct sctp_supported_chunk_types_param *pr_supported;
4583         int cnt_inits_to = 0;
4584         int padval, ret;
4585         int num_ext;
4586         int p_len;
4587
4588         /* INIT's always go to the primary (and usually ONLY address) */
4589         mp_last = NULL;
4590         net = stcb->asoc.primary_destination;
4591         if (net == NULL) {
4592                 net = TAILQ_FIRST(&stcb->asoc.nets);
4593                 if (net == NULL) {
4594                         /* TSNH */
4595                         return;
4596                 }
4597                 /* we confirm any address we send an INIT to */
4598                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4599                 (void)sctp_set_primary_addr(stcb, NULL, net);
4600         } else {
4601                 /* we confirm any address we send an INIT to */
4602                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4603         }
4604         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4605 #ifdef INET6
4606         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4607                 /*
4608                  * special hook, if we are sending to link local it will not
4609                  * show up in our private address count.
4610                  */
4611                 struct sockaddr_in6 *sin6l;
4612
4613                 sin6l = &net->ro._l_addr.sin6;
4614                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4615                         cnt_inits_to = 1;
4616         }
4617 #endif
4618         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4619                 /* This case should not happen */
4620                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4621                 return;
4622         }
4623         /* start the INIT timer */
4624         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4625
4626         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4627         if (m == NULL) {
4628                 /* No memory, INIT timer will re-attempt. */
4629                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4630                 return;
4631         }
4632         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4633         /*
4634          * assume peer supports asconf in order to be able to queue local
4635          * address changes while an INIT is in flight and before the assoc
4636          * is established.
4637          */
4638         stcb->asoc.peer_supports_asconf = 1;
4639         /* Now lets put the SCTP header in place */
4640         init = mtod(m, struct sctp_init_chunk *);
4641         /* now the chunk header */
4642         init->ch.chunk_type = SCTP_INITIATION;
4643         init->ch.chunk_flags = 0;
4644         /* fill in later from mbuf we build */
4645         init->ch.chunk_length = 0;
4646         /* place in my tag */
4647         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4648         /* set up some of the credits. */
4649         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4650             SCTP_MINIMAL_RWND));
4651
4652         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4653         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4654         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4655         /* now the address restriction */
4656         /* XXX Should we take the address family of the socket into account? */
4657         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4658             sizeof(*init));
4659         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4660 #ifdef INET6
4661 #ifdef INET
4662         /* we support 2 types: IPv4/IPv6 */
4663         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4664         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4665         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4666 #else
4667         /* we support 1 type: IPv6 */
4668         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4669         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4670         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4671 #endif
4672 #else
4673         /* we support 1 type: IPv4 */
4674         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4675         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4676         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4677 #endif
4678         SCTP_BUF_LEN(m) += sizeof(struct sctp_supported_addr_param);
4679         /* adaptation layer indication parameter */
4680         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(struct sctp_supported_addr_param));
4681         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4682         ali->ph.param_length = htons(sizeof(*ali));
4683         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4684         SCTP_BUF_LEN(m) += sizeof(*ali);
4685         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4686
4687         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4688                 /* Add NAT friendly parameter */
4689                 struct sctp_paramhdr *ph;
4690
4691                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4692                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4693                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4694                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4695                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4696         }
4697         /* now any cookie time extensions */
4698         if (stcb->asoc.cookie_preserve_req) {
4699                 struct sctp_cookie_perserve_param *cookie_preserve;
4700
4701                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4702                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4703                 cookie_preserve->ph.param_length = htons(
4704                     sizeof(*cookie_preserve));
4705                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4706                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4707                 ecn = (struct sctp_ecn_supported_param *)(
4708                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4709                 stcb->asoc.cookie_preserve_req = 0;
4710         }
4711         /* ECN parameter */
4712         if (stcb->asoc.ecn_allowed == 1) {
4713                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4714                 ecn->ph.param_length = htons(sizeof(*ecn));
4715                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4716                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4717                     sizeof(*ecn));
4718         } else {
4719                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4720         }
4721         /* And now tell the peer we do pr-sctp */
4722         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4723         prsctp->ph.param_length = htons(sizeof(*prsctp));
4724         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4725
4726         /* And now tell the peer we do all the extensions */
4727         pr_supported = (struct sctp_supported_chunk_types_param *)
4728             ((caddr_t)prsctp + sizeof(*prsctp));
4729         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4730         num_ext = 0;
4731         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4732         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4733         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4734         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4735         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4736         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4737                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4738         }
4739         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4740                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4741         }
4742         p_len = sizeof(*pr_supported) + num_ext;
4743         pr_supported->ph.param_length = htons(p_len);
4744         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4745         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4746
4747
4748         /* add authentication parameters */
4749         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4750                 struct sctp_auth_random *randp;
4751                 struct sctp_auth_hmac_algo *hmacs;
4752                 struct sctp_auth_chunk_list *chunks;
4753
4754                 /* attach RANDOM parameter, if available */
4755                 if (stcb->asoc.authinfo.random != NULL) {
4756                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4757                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4758                         /* random key already contains the header */
4759                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4760                         /* zero out any padding required */
4761                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4762                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4763                 }
4764                 /* add HMAC_ALGO parameter */
4765                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4766                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4767                     (uint8_t *) hmacs->hmac_ids);
4768                 if (p_len > 0) {
4769                         p_len += sizeof(*hmacs);
4770                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4771                         hmacs->ph.param_length = htons(p_len);
4772                         /* zero out any padding required */
4773                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4774                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4775                 }
4776                 /* add CHUNKS parameter */
4777                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4778                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4779                     chunks->chunk_types);
4780                 if (p_len > 0) {
4781                         p_len += sizeof(*chunks);
4782                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4783                         chunks->ph.param_length = htons(p_len);
4784                         /* zero out any padding required */
4785                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4786                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4787                 }
4788         }
4789         /* now the addresses */
4790         {
4791                 struct sctp_scoping scp;
4792
4793                 /*
4794                  * To optimize this we could put the scoping stuff into a
4795                  * structure and remove the individual uint8's from the
4796                  * assoc structure. Then we could just sifa in the address
4797                  * within the stcb. But for now this is a quick hack to get
4798                  * the address stuff teased apart.
4799                  */
4800
4801                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4802                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4803                 scp.loopback_scope = stcb->asoc.loopback_scope;
4804                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4805                 scp.local_scope = stcb->asoc.local_scope;
4806                 scp.site_scope = stcb->asoc.site_scope;
4807
4808                 sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to);
4809         }
4810
4811         /* calulate the size and update pkt header and chunk header */
4812         p_len = 0;
4813         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4814                 if (SCTP_BUF_NEXT(m_at) == NULL)
4815                         mp_last = m_at;
4816                 p_len += SCTP_BUF_LEN(m_at);
4817         }
4818         init->ch.chunk_length = htons(p_len);
4819         /*
4820          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4821          * here since the timer will drive a retranmission.
4822          */
4823
4824         /* I don't expect this to execute but we will be safe here */
4825         padval = p_len % 4;
4826         if ((padval) && (mp_last)) {
4827                 /*
4828                  * The compiler worries that mp_last may not be set even
4829                  * though I think it is impossible :-> however we add
4830                  * mp_last here just in case.
4831                  */
4832                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4833                 if (ret) {
4834                         /* Houston we have a problem, no space */
4835                         sctp_m_freem(m);
4836                         return;
4837                 }
4838         }
4839         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4840         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4841             (struct sockaddr *)&net->ro._l_addr,
4842             m, 0, NULL, 0, 0, 0, 0,
4843             inp->sctp_lport, stcb->rport, htonl(0),
4844             net->port, NULL,
4845             0, 0,
4846             so_locked);
4847         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4848         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4849         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4850 }
4851
4852 struct mbuf *
4853 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4854     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4855 {
4856         /*
4857          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4858          * being equal to the beginning of the params i.e. (iphlen +
4859          * sizeof(struct sctp_init_msg) parse through the parameters to the
4860          * end of the mbuf verifying that all parameters are known.
4861          *
4862          * For unknown parameters build and return a mbuf with
4863          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4864          * processing this chunk stop, and set *abort_processing to 1.
4865          *
4866          * By having param_offset be pre-set to where parameters begin it is
4867          * hoped that this routine may be reused in the future by new
4868          * features.
4869          */
4870         struct sctp_paramhdr *phdr, params;
4871
4872         struct mbuf *mat, *op_err;
4873         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4874         int at, limit, pad_needed;
4875         uint16_t ptype, plen, padded_size;
4876         int err_at;
4877
4878         *abort_processing = 0;
4879         mat = in_initpkt;
4880         err_at = 0;
4881         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4882         at = param_offset;
4883         op_err = NULL;
4884         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4885         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4886         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4887                 ptype = ntohs(phdr->param_type);
4888                 plen = ntohs(phdr->param_length);
4889                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4890                         /* wacked parameter */
4891                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4892                         goto invalid_size;
4893                 }
4894                 limit -= SCTP_SIZE32(plen);
4895                 /*-
4896                  * All parameters for all chunks that we know/understand are
4897                  * listed here. We process them other places and make
4898                  * appropriate stop actions per the upper bits. However this
4899                  * is the generic routine processor's can call to get back
4900                  * an operr.. to either incorporate (init-ack) or send.
4901                  */
4902                 padded_size = SCTP_SIZE32(plen);
4903                 switch (ptype) {
4904                         /* Param's with variable size */
4905                 case SCTP_HEARTBEAT_INFO:
4906                 case SCTP_STATE_COOKIE:
4907                 case SCTP_UNRECOG_PARAM:
4908                 case SCTP_ERROR_CAUSE_IND:
4909                         /* ok skip fwd */
4910                         at += padded_size;
4911                         break;
4912                         /* Param's with variable size within a range */
4913                 case SCTP_CHUNK_LIST:
4914                 case SCTP_SUPPORTED_CHUNK_EXT:
4915                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4916                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4917                                 goto invalid_size;
4918                         }
4919                         at += padded_size;
4920                         break;
4921                 case SCTP_SUPPORTED_ADDRTYPE:
4922                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4923                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4924                                 goto invalid_size;
4925                         }
4926                         at += padded_size;
4927                         break;
4928                 case SCTP_RANDOM:
4929                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4930                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4931                                 goto invalid_size;
4932                         }
4933                         at += padded_size;
4934                         break;
4935                 case SCTP_SET_PRIM_ADDR:
4936                 case SCTP_DEL_IP_ADDRESS:
4937                 case SCTP_ADD_IP_ADDRESS:
4938                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4939                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4940                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4941                                 goto invalid_size;
4942                         }
4943                         at += padded_size;
4944                         break;
4945                         /* Param's with a fixed size */
4946                 case SCTP_IPV4_ADDRESS:
4947                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4948                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4949                                 goto invalid_size;
4950                         }
4951                         at += padded_size;
4952                         break;
4953                 case SCTP_IPV6_ADDRESS:
4954                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4955                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4956                                 goto invalid_size;
4957                         }
4958                         at += padded_size;
4959                         break;
4960                 case SCTP_COOKIE_PRESERVE:
4961                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4962                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4963                                 goto invalid_size;
4964                         }
4965                         at += padded_size;
4966                         break;
4967                 case SCTP_HAS_NAT_SUPPORT:
4968                         *nat_friendly = 1;
4969                         /* fall through */
4970                 case SCTP_PRSCTP_SUPPORTED:
4971
4972                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4973                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4974                                 goto invalid_size;
4975                         }
4976                         at += padded_size;
4977                         break;
4978                 case SCTP_ECN_CAPABLE:
4979                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4980                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4981                                 goto invalid_size;
4982                         }
4983                         at += padded_size;
4984                         break;
4985                 case SCTP_ULP_ADAPTATION:
4986                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4987                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4988                                 goto invalid_size;
4989                         }
4990                         at += padded_size;
4991                         break;
4992                 case SCTP_SUCCESS_REPORT:
4993                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4994                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4995                                 goto invalid_size;
4996                         }
4997                         at += padded_size;
4998                         break;
4999                 case SCTP_HOSTNAME_ADDRESS:
5000                         {
5001                                 /* We can NOT handle HOST NAME addresses!! */
5002                                 int l_len;
5003
5004                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5005                                 *abort_processing = 1;
5006                                 if (op_err == NULL) {
5007                                         /* Ok need to try to get a mbuf */
5008 #ifdef INET6
5009                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5010 #else
5011                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5012 #endif
5013                                         l_len += plen;
5014                                         l_len += sizeof(struct sctp_paramhdr);
5015                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5016                                         if (op_err) {
5017                                                 SCTP_BUF_LEN(op_err) = 0;
5018                                                 /*
5019                                                  * pre-reserve space for ip
5020                                                  * and sctp header  and
5021                                                  * chunk hdr
5022                                                  */
5023 #ifdef INET6
5024                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5025 #else
5026                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5027 #endif
5028                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5029                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5030                                         }
5031                                 }
5032                                 if (op_err) {
5033                                         /* If we have space */
5034                                         struct sctp_paramhdr s;
5035
5036                                         if (err_at % 4) {
5037                                                 uint32_t cpthis = 0;
5038
5039                                                 pad_needed = 4 - (err_at % 4);
5040                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5041                                                 err_at += pad_needed;
5042                                         }
5043                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5044                                         s.param_length = htons(sizeof(s) + plen);
5045                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5046                                         err_at += sizeof(s);
5047                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5048                                         if (phdr == NULL) {
5049                                                 sctp_m_freem(op_err);
5050                                                 /*
5051                                                  * we are out of memory but
5052                                                  * we still need to have a
5053                                                  * look at what to do (the
5054                                                  * system is in trouble
5055                                                  * though).
5056                                                  */
5057                                                 return (NULL);
5058                                         }
5059                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5060                                 }
5061                                 return (op_err);
5062                                 break;
5063                         }
5064                 default:
5065                         /*
5066                          * we do not recognize the parameter figure out what
5067                          * we do.
5068                          */
5069                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5070                         if ((ptype & 0x4000) == 0x4000) {
5071                                 /* Report bit is set?? */
5072                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5073                                 if (op_err == NULL) {
5074                                         int l_len;
5075
5076                                         /* Ok need to try to get an mbuf */
5077 #ifdef INET6
5078                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5079 #else
5080                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5081 #endif
5082                                         l_len += plen;
5083                                         l_len += sizeof(struct sctp_paramhdr);
5084                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5085                                         if (op_err) {
5086                                                 SCTP_BUF_LEN(op_err) = 0;
5087 #ifdef INET6
5088                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5089 #else
5090                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5091 #endif
5092                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5093                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5094                                         }
5095                                 }
5096                                 if (op_err) {
5097                                         /* If we have space */
5098                                         struct sctp_paramhdr s;
5099
5100                                         if (err_at % 4) {
5101                                                 uint32_t cpthis = 0;
5102
5103                                                 pad_needed = 4 - (err_at % 4);
5104                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5105                                                 err_at += pad_needed;
5106                                         }
5107                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5108                                         s.param_length = htons(sizeof(s) + plen);
5109                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5110                                         err_at += sizeof(s);
5111                                         if (plen > sizeof(tempbuf)) {
5112                                                 plen = sizeof(tempbuf);
5113                                         }
5114                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5115                                         if (phdr == NULL) {
5116                                                 sctp_m_freem(op_err);
5117                                                 /*
5118                                                  * we are out of memory but
5119                                                  * we still need to have a
5120                                                  * look at what to do (the
5121                                                  * system is in trouble
5122                                                  * though).
5123                                                  */
5124                                                 op_err = NULL;
5125                                                 goto more_processing;
5126                                         }
5127                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5128                                         err_at += plen;
5129                                 }
5130                         }
5131         more_processing:
5132                         if ((ptype & 0x8000) == 0x0000) {
5133                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5134                                 return (op_err);
5135                         } else {
5136                                 /* skip this chunk and continue processing */
5137                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5138                                 at += SCTP_SIZE32(plen);
5139                         }
5140                         break;
5141
5142                 }
5143                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5144         }
5145         return (op_err);
5146 invalid_size:
5147         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5148         *abort_processing = 1;
5149         if ((op_err == NULL) && phdr) {
5150                 int l_len;
5151
5152 #ifdef INET6
5153                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5154 #else
5155                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5156 #endif
5157                 l_len += (2 * sizeof(struct sctp_paramhdr));
5158                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5159                 if (op_err) {
5160                         SCTP_BUF_LEN(op_err) = 0;
5161 #ifdef INET6
5162                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5163 #else
5164                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5165 #endif
5166                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5167                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5168                 }
5169         }
5170         if ((op_err) && phdr) {
5171                 struct sctp_paramhdr s;
5172
5173                 if (err_at % 4) {
5174                         uint32_t cpthis = 0;
5175
5176                         pad_needed = 4 - (err_at % 4);
5177                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5178                         err_at += pad_needed;
5179                 }
5180                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5181                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5182                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5183                 err_at += sizeof(s);
5184                 /* Only copy back the p-hdr that caused the issue */
5185                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5186         }
5187         return (op_err);
5188 }
5189
5190 static int
5191 sctp_are_there_new_addresses(struct sctp_association *asoc,
5192     struct mbuf *in_initpkt, int offset)
5193 {
5194         /*
5195          * Given a INIT packet, look through the packet to verify that there
5196          * are NO new addresses. As we go through the parameters add reports
5197          * of any un-understood parameters that require an error.  Also we
5198          * must return (1) to drop the packet if we see a un-understood
5199          * parameter that tells us to drop the chunk.
5200          */
5201         struct sockaddr *sa_touse;
5202         struct sockaddr *sa;
5203         struct sctp_paramhdr *phdr, params;
5204         uint16_t ptype, plen;
5205         uint8_t fnd;
5206         struct sctp_nets *net;
5207         struct ip *iph;
5208
5209 #ifdef INET
5210         struct sockaddr_in sin4, *sa4;
5211
5212 #endif
5213 #ifdef INET6
5214         struct sockaddr_in6 sin6, *sa6;
5215         struct ip6_hdr *ip6h;
5216
5217 #endif
5218
5219 #ifdef INET
5220         memset(&sin4, 0, sizeof(sin4));
5221         sin4.sin_family = AF_INET;
5222         sin4.sin_len = sizeof(sin4);
5223 #endif
5224 #ifdef INET6
5225         memset(&sin6, 0, sizeof(sin6));
5226         sin6.sin6_family = AF_INET6;
5227         sin6.sin6_len = sizeof(sin6);
5228 #endif
5229         sa_touse = NULL;
5230         /* First what about the src address of the pkt ? */
5231         iph = mtod(in_initpkt, struct ip *);
5232         switch (iph->ip_v) {
5233 #ifdef INET
5234         case IPVERSION:
5235                 /* source addr is IPv4 */
5236                 sin4.sin_addr = iph->ip_src;
5237                 sa_touse = (struct sockaddr *)&sin4;
5238                 break;
5239 #endif
5240 #ifdef INET6
5241         case IPV6_VERSION >> 4:
5242                 /* source addr is IPv6 */
5243                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
5244                 sin6.sin6_addr = ip6h->ip6_src;
5245                 sa_touse = (struct sockaddr *)&sin6;
5246                 break;
5247 #endif
5248         default:
5249                 return (1);
5250         }
5251
5252         fnd = 0;
5253         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5254                 sa = (struct sockaddr *)&net->ro._l_addr;
5255                 if (sa->sa_family == sa_touse->sa_family) {
5256 #ifdef INET
5257                         if (sa->sa_family == AF_INET) {
5258                                 sa4 = (struct sockaddr_in *)sa;
5259                                 if (sa4->sin_addr.s_addr == sin4.sin_addr.s_addr) {
5260                                         fnd = 1;
5261                                         break;
5262                                 }
5263                         }
5264 #endif
5265 #ifdef INET6
5266                         if (sa->sa_family == AF_INET6) {
5267                                 sa6 = (struct sockaddr_in6 *)sa;
5268                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, &sin6)) {
5269                                         fnd = 1;
5270                                         break;
5271                                 }
5272                         }
5273 #endif
5274                 }
5275         }
5276         if (fnd == 0) {
5277                 /* New address added! no need to look futher. */
5278                 return (1);
5279         }
5280         /* Ok so far lets munge through the rest of the packet */
5281         offset += sizeof(struct sctp_init_chunk);
5282         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5283         while (phdr) {
5284                 sa_touse = NULL;
5285                 ptype = ntohs(phdr->param_type);
5286                 plen = ntohs(phdr->param_length);
5287                 switch (ptype) {
5288 #ifdef INET
5289                 case SCTP_IPV4_ADDRESS:
5290                         {
5291                                 struct sctp_ipv4addr_param *p4, p4_buf;
5292
5293                                 phdr = sctp_get_next_param(in_initpkt, offset,
5294                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5295                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5296                                     phdr == NULL) {
5297                                         return (1);
5298                                 }
5299                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5300                                 sin4.sin_addr.s_addr = p4->addr;
5301                                 sa_touse = (struct sockaddr *)&sin4;
5302                                 break;
5303                         }
5304 #endif
5305 #ifdef INET6
5306                 case SCTP_IPV6_ADDRESS:
5307                         {
5308                                 struct sctp_ipv6addr_param *p6, p6_buf;
5309
5310                                 phdr = sctp_get_next_param(in_initpkt, offset,
5311                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5312                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5313                                     phdr == NULL) {
5314                                         return (1);
5315                                 }
5316                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5317                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5318                                     sizeof(p6->addr));
5319                                 sa_touse = (struct sockaddr *)&sin6;
5320                                 break;
5321                         }
5322 #endif
5323                 default:
5324                         sa_touse = NULL;
5325                         break;
5326                 }
5327                 if (sa_touse) {
5328                         /* ok, sa_touse points to one to check */
5329                         fnd = 0;
5330                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5331                                 sa = (struct sockaddr *)&net->ro._l_addr;
5332                                 if (sa->sa_family != sa_touse->sa_family) {
5333                                         continue;
5334                                 }
5335 #ifdef INET
5336                                 if (sa->sa_family == AF_INET) {
5337                                         sa4 = (struct sockaddr_in *)sa;
5338                                         if (sa4->sin_addr.s_addr ==
5339                                             sin4.sin_addr.s_addr) {
5340                                                 fnd = 1;
5341                                                 break;
5342                                         }
5343                                 }
5344 #endif
5345 #ifdef INET6
5346                                 if (sa->sa_family == AF_INET6) {
5347                                         sa6 = (struct sockaddr_in6 *)sa;
5348                                         if (SCTP6_ARE_ADDR_EQUAL(
5349                                             sa6, &sin6)) {
5350                                                 fnd = 1;
5351                                                 break;
5352                                         }
5353                                 }
5354 #endif
5355                         }
5356                         if (!fnd) {
5357                                 /* New addr added! no need to look further */
5358                                 return (1);
5359                         }
5360                 }
5361                 offset += SCTP_SIZE32(plen);
5362                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5363         }
5364         return (0);
5365 }
5366
5367 /*
5368  * Given a MBUF chain that was sent into us containing an INIT. Build a
5369  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5370  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5371  * message (i.e. the struct sctp_init_msg).
5372  */
5373 void
5374 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5375     struct mbuf *init_pkt, int iphlen, int offset,
5376     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5377     uint8_t use_mflowid, uint32_t mflowid,
5378     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5379 {
5380         struct sctp_association *asoc;
5381         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5382         struct sctp_init_ack_chunk *initack;
5383         struct sctp_adaptation_layer_indication *ali;
5384         struct sctp_ecn_supported_param *ecn;
5385         struct sctp_prsctp_supported_param *prsctp;
5386         struct sctp_supported_chunk_types_param *pr_supported;
5387         union sctp_sockstore store, store1, *over_addr;
5388
5389 #ifdef INET
5390         struct sockaddr_in *sin, *to_sin;
5391
5392 #endif
5393 #ifdef INET6
5394         struct sockaddr_in6 *sin6, *to_sin6;
5395
5396 #endif
5397         struct ip *iph;
5398
5399 #ifdef INET6
5400         struct ip6_hdr *ip6;
5401
5402 #endif
5403         struct sockaddr *to;
5404         struct sctp_state_cookie stc;
5405         struct sctp_nets *net = NULL;
5406         uint8_t *signature = NULL;
5407         int cnt_inits_to = 0;
5408         uint16_t his_limit, i_want;
5409         int abort_flag, padval;
5410         int num_ext;
5411         int p_len;
5412         int nat_friendly = 0;
5413         struct socket *so;
5414
5415         if (stcb)
5416                 asoc = &stcb->asoc;
5417         else
5418                 asoc = NULL;
5419         mp_last = NULL;
5420         if ((asoc != NULL) &&
5421             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5422             (sctp_are_there_new_addresses(asoc, init_pkt, offset))) {
5423                 /* new addresses, out of here in non-cookie-wait states */
5424                 /*
5425                  * Send a ABORT, we don't add the new address error clause
5426                  * though we even set the T bit and copy in the 0 tag.. this
5427                  * looks no different than if no listener was present.
5428                  */
5429                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL,
5430                     use_mflowid, mflowid,
5431                     vrf_id, port);
5432                 return;
5433         }
5434         abort_flag = 0;
5435         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5436             (offset + sizeof(struct sctp_init_chunk)),
5437             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5438         if (abort_flag) {
5439 do_a_abort:
5440                 sctp_send_abort(init_pkt, iphlen, sh,
5441                     init_chk->init.initiate_tag, op_err,
5442                     use_mflowid, mflowid,
5443                     vrf_id, port);
5444                 return;
5445         }
5446         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5447         if (m == NULL) {
5448                 /* No memory, INIT timer will re-attempt. */
5449                 if (op_err)
5450                         sctp_m_freem(op_err);
5451                 return;
5452         }
5453         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5454
5455         /* the time I built cookie */
5456         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5457
5458         /* populate any tie tags */
5459         if (asoc != NULL) {
5460                 /* unlock before tag selections */
5461                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5462                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5463                 stc.cookie_life = asoc->cookie_life;
5464                 net = asoc->primary_destination;
5465         } else {
5466                 stc.tie_tag_my_vtag = 0;
5467                 stc.tie_tag_peer_vtag = 0;
5468                 /* life I will award this cookie */
5469                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5470         }
5471
5472         /* copy in the ports for later check */
5473         stc.myport = sh->dest_port;
5474         stc.peerport = sh->src_port;
5475
5476         /*
5477          * If we wanted to honor cookie life extentions, we would add to
5478          * stc.cookie_life. For now we should NOT honor any extension
5479          */
5480         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5481         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5482                 struct inpcb *in_inp;
5483
5484                 /* Its a V6 socket */
5485                 in_inp = (struct inpcb *)inp;
5486                 stc.ipv6_addr_legal = 1;
5487                 /* Now look at the binding flag to see if V4 will be legal */
5488                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5489                         stc.ipv4_addr_legal = 1;
5490                 } else {
5491                         /* V4 addresses are NOT legal on the association */
5492                         stc.ipv4_addr_legal = 0;
5493                 }
5494         } else {
5495                 /* Its a V4 socket, no - V6 */
5496                 stc.ipv4_addr_legal = 1;
5497                 stc.ipv6_addr_legal = 0;
5498         }
5499
5500 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5501         stc.ipv4_scope = 1;
5502 #else
5503         stc.ipv4_scope = 0;
5504 #endif
5505         /* now for scope setup */
5506         memset((caddr_t)&store, 0, sizeof(store));
5507         memset((caddr_t)&store1, 0, sizeof(store1));
5508 #ifdef INET
5509         sin = &store.sin;
5510         to_sin = &store1.sin;
5511 #endif
5512 #ifdef INET6
5513         sin6 = &store.sin6;
5514         to_sin6 = &store1.sin6;
5515 #endif
5516         iph = mtod(init_pkt, struct ip *);
5517         /* establish the to_addr's */
5518         switch (iph->ip_v) {
5519 #ifdef INET
5520         case IPVERSION:
5521                 to_sin->sin_port = sh->dest_port;
5522                 to_sin->sin_family = AF_INET;
5523                 to_sin->sin_len = sizeof(struct sockaddr_in);
5524                 to_sin->sin_addr = iph->ip_dst;
5525                 break;
5526 #endif
5527 #ifdef INET6
5528         case IPV6_VERSION >> 4:
5529                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5530                 to_sin6->sin6_addr = ip6->ip6_dst;
5531                 to_sin6->sin6_scope_id = 0;
5532                 to_sin6->sin6_port = sh->dest_port;
5533                 to_sin6->sin6_family = AF_INET6;
5534                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5535                 break;
5536 #endif
5537         default:
5538                 goto do_a_abort;
5539                 break;
5540         }
5541
5542         if (net == NULL) {
5543                 to = (struct sockaddr *)&store;
5544                 switch (iph->ip_v) {
5545 #ifdef INET
5546                 case IPVERSION:
5547                         {
5548                                 sin->sin_family = AF_INET;
5549                                 sin->sin_len = sizeof(struct sockaddr_in);
5550                                 sin->sin_port = sh->src_port;
5551                                 sin->sin_addr = iph->ip_src;
5552                                 /* lookup address */
5553                                 stc.address[0] = sin->sin_addr.s_addr;
5554                                 stc.address[1] = 0;
5555                                 stc.address[2] = 0;
5556                                 stc.address[3] = 0;
5557                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5558                                 /* local from address */
5559                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5560                                 stc.laddress[1] = 0;
5561                                 stc.laddress[2] = 0;
5562                                 stc.laddress[3] = 0;
5563                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5564                                 /* scope_id is only for v6 */
5565                                 stc.scope_id = 0;
5566 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5567                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5568                                         stc.ipv4_scope = 1;
5569                                 }
5570 #else
5571                                 stc.ipv4_scope = 1;
5572 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5573                                 /* Must use the address in this case */
5574                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5575                                         stc.loopback_scope = 1;
5576                                         stc.ipv4_scope = 1;
5577                                         stc.site_scope = 1;
5578                                         stc.local_scope = 0;
5579                                 }
5580                                 break;
5581                         }
5582 #endif
5583 #ifdef INET6
5584                 case IPV6_VERSION >> 4:
5585                         {
5586                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5587                                 sin6->sin6_family = AF_INET6;
5588                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5589                                 sin6->sin6_port = sh->src_port;
5590                                 sin6->sin6_addr = ip6->ip6_src;
5591                                 /* lookup address */
5592                                 memcpy(&stc.address, &sin6->sin6_addr,
5593                                     sizeof(struct in6_addr));
5594                                 sin6->sin6_scope_id = 0;
5595                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5596                                 stc.scope_id = 0;
5597                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5598                                         /*
5599                                          * FIX ME: does this have scope from
5600                                          * rcvif?
5601                                          */
5602                                         (void)sa6_recoverscope(sin6);
5603                                         stc.scope_id = sin6->sin6_scope_id;
5604                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5605                                         stc.loopback_scope = 1;
5606                                         stc.local_scope = 0;
5607                                         stc.site_scope = 1;
5608                                         stc.ipv4_scope = 1;
5609                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5610                                         /*
5611                                          * If the new destination is a
5612                                          * LINK_LOCAL we must have common
5613                                          * both site and local scope. Don't
5614                                          * set local scope though since we
5615                                          * must depend on the source to be
5616                                          * added implicitly. We cannot
5617                                          * assure just because we share one
5618                                          * link that all links are common.
5619                                          */
5620                                         stc.local_scope = 0;
5621                                         stc.site_scope = 1;
5622                                         stc.ipv4_scope = 1;
5623                                         /*
5624                                          * we start counting for the private
5625                                          * address stuff at 1. since the
5626                                          * link local we source from won't
5627                                          * show up in our scoped count.
5628                                          */
5629                                         cnt_inits_to = 1;
5630                                         /*
5631                                          * pull out the scope_id from
5632                                          * incoming pkt
5633                                          */
5634                                         /*
5635                                          * FIX ME: does this have scope from
5636                                          * rcvif?
5637                                          */
5638                                         (void)sa6_recoverscope(sin6);
5639                                         stc.scope_id = sin6->sin6_scope_id;
5640                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5641                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5642                                         /*
5643                                          * If the new destination is
5644                                          * SITE_LOCAL then we must have site
5645                                          * scope in common.
5646                                          */
5647                                         stc.site_scope = 1;
5648                                 }
5649                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5650                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5651                                 break;
5652                         }
5653 #endif
5654                 default:
5655                         /* TSNH */
5656                         goto do_a_abort;
5657                         break;
5658                 }
5659         } else {
5660                 /* set the scope per the existing tcb */
5661
5662 #ifdef INET6
5663                 struct sctp_nets *lnet;
5664
5665 #endif
5666
5667                 stc.loopback_scope = asoc->loopback_scope;
5668                 stc.ipv4_scope = asoc->ipv4_local_scope;
5669                 stc.site_scope = asoc->site_scope;
5670                 stc.local_scope = asoc->local_scope;
5671 #ifdef INET6
5672                 /* Why do we not consider IPv4 LL addresses? */
5673                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5674                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5675                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5676                                         /*
5677                                          * if we have a LL address, start
5678                                          * counting at 1.
5679                                          */
5680                                         cnt_inits_to = 1;
5681                                 }
5682                         }
5683                 }
5684 #endif
5685                 /* use the net pointer */
5686                 to = (struct sockaddr *)&net->ro._l_addr;
5687                 switch (to->sa_family) {
5688 #ifdef INET
5689                 case AF_INET:
5690                         sin = (struct sockaddr_in *)to;
5691                         stc.address[0] = sin->sin_addr.s_addr;
5692                         stc.address[1] = 0;
5693                         stc.address[2] = 0;
5694                         stc.address[3] = 0;
5695                         stc.addr_type = SCTP_IPV4_ADDRESS;
5696                         if (net->src_addr_selected == 0) {
5697                                 /*
5698                                  * strange case here, the INIT should have
5699                                  * did the selection.
5700                                  */
5701                                 net->ro._s_addr = sctp_source_address_selection(inp,
5702                                     stcb, (sctp_route_t *) & net->ro,
5703                                     net, 0, vrf_id);
5704                                 if (net->ro._s_addr == NULL)
5705                                         return;
5706
5707                                 net->src_addr_selected = 1;
5708
5709                         }
5710                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5711                         stc.laddress[1] = 0;
5712                         stc.laddress[2] = 0;
5713                         stc.laddress[3] = 0;
5714                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5715                         /* scope_id is only for v6 */
5716                         stc.scope_id = 0;
5717                         break;
5718 #endif
5719 #ifdef INET6
5720                 case AF_INET6:
5721                         sin6 = (struct sockaddr_in6 *)to;
5722                         memcpy(&stc.address, &sin6->sin6_addr,
5723                             sizeof(struct in6_addr));
5724                         stc.addr_type = SCTP_IPV6_ADDRESS;
5725                         stc.scope_id = sin6->sin6_scope_id;
5726                         if (net->src_addr_selected == 0) {
5727                                 /*
5728                                  * strange case here, the INIT should have
5729                                  * did the selection.
5730                                  */
5731                                 net->ro._s_addr = sctp_source_address_selection(inp,
5732                                     stcb, (sctp_route_t *) & net->ro,
5733                                     net, 0, vrf_id);
5734                                 if (net->ro._s_addr == NULL)
5735                                         return;
5736
5737                                 net->src_addr_selected = 1;
5738                         }
5739                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5740                             sizeof(struct in6_addr));
5741                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5742                         break;
5743 #endif
5744                 }
5745         }
5746         /* Now lets put the SCTP header in place */
5747         initack = mtod(m, struct sctp_init_ack_chunk *);
5748         /* Save it off for quick ref */
5749         stc.peers_vtag = init_chk->init.initiate_tag;
5750         /* who are we */
5751         memcpy(stc.identification, SCTP_VERSION_STRING,
5752             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5753         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5754         /* now the chunk header */
5755         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5756         initack->ch.chunk_flags = 0;
5757         /* fill in later from mbuf we build */
5758         initack->ch.chunk_length = 0;
5759         /* place in my tag */
5760         if ((asoc != NULL) &&
5761             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5762             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5763             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5764                 /* re-use the v-tags and init-seq here */
5765                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5766                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5767         } else {
5768                 uint32_t vtag, itsn;
5769
5770                 if (hold_inp_lock) {
5771                         SCTP_INP_INCR_REF(inp);
5772                         SCTP_INP_RUNLOCK(inp);
5773                 }
5774                 if (asoc) {
5775                         atomic_add_int(&asoc->refcnt, 1);
5776                         SCTP_TCB_UNLOCK(stcb);
5777         new_tag:
5778                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5779                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5780                                 /*
5781                                  * Got a duplicate vtag on some guy behind a
5782                                  * nat make sure we don't use it.
5783                                  */
5784                                 goto new_tag;
5785                         }
5786                         initack->init.initiate_tag = htonl(vtag);
5787                         /* get a TSN to use too */
5788                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5789                         initack->init.initial_tsn = htonl(itsn);
5790                         SCTP_TCB_LOCK(stcb);
5791                         atomic_add_int(&asoc->refcnt, -1);
5792                 } else {
5793                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5794                         initack->init.initiate_tag = htonl(vtag);
5795                         /* get a TSN to use too */
5796                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5797                 }
5798                 if (hold_inp_lock) {
5799                         SCTP_INP_RLOCK(inp);
5800                         SCTP_INP_DECR_REF(inp);
5801                 }
5802         }
5803         /* save away my tag to */
5804         stc.my_vtag = initack->init.initiate_tag;
5805
5806         /* set up some of the credits. */
5807         so = inp->sctp_socket;
5808         if (so == NULL) {
5809                 /* memory problem */
5810                 sctp_m_freem(m);
5811                 return;
5812         } else {
5813                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5814         }
5815         /* set what I want */
5816         his_limit = ntohs(init_chk->init.num_inbound_streams);
5817         /* choose what I want */
5818         if (asoc != NULL) {
5819                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5820                         i_want = asoc->streamoutcnt;
5821                 } else {
5822                         i_want = inp->sctp_ep.pre_open_stream_count;
5823                 }
5824         } else {
5825                 i_want = inp->sctp_ep.pre_open_stream_count;
5826         }
5827         if (his_limit < i_want) {
5828                 /* I Want more :< */
5829                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5830         } else {
5831                 /* I can have what I want :> */
5832                 initack->init.num_outbound_streams = htons(i_want);
5833         }
5834         /* tell him his limt. */
5835         initack->init.num_inbound_streams =
5836             htons(inp->sctp_ep.max_open_streams_intome);
5837
5838         /* adaptation layer indication parameter */
5839         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5840         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5841         ali->ph.param_length = htons(sizeof(*ali));
5842         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5843         SCTP_BUF_LEN(m) += sizeof(*ali);
5844         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5845
5846         /* ECN parameter */
5847         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5848             (inp->sctp_ecn_enable == 1)) {
5849                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5850                 ecn->ph.param_length = htons(sizeof(*ecn));
5851                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5852
5853                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5854                     sizeof(*ecn));
5855         } else {
5856                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5857         }
5858         /* And now tell the peer we do  pr-sctp */
5859         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5860         prsctp->ph.param_length = htons(sizeof(*prsctp));
5861         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5862         if (nat_friendly) {
5863                 /* Add NAT friendly parameter */
5864                 struct sctp_paramhdr *ph;
5865
5866                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5867                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5868                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5869                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5870         }
5871         /* And now tell the peer we do all the extensions */
5872         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5873         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5874         num_ext = 0;
5875         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5876         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5877         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5878         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5879         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5880         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5881                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5882         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5883                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5884         p_len = sizeof(*pr_supported) + num_ext;
5885         pr_supported->ph.param_length = htons(p_len);
5886         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5887         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5888
5889         /* add authentication parameters */
5890         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5891                 struct sctp_auth_random *randp;
5892                 struct sctp_auth_hmac_algo *hmacs;
5893                 struct sctp_auth_chunk_list *chunks;
5894                 uint16_t random_len;
5895
5896                 /* generate and add RANDOM parameter */
5897                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5898                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5899                 randp->ph.param_type = htons(SCTP_RANDOM);
5900                 p_len = sizeof(*randp) + random_len;
5901                 randp->ph.param_length = htons(p_len);
5902                 SCTP_READ_RANDOM(randp->random_data, random_len);
5903                 /* zero out any padding required */
5904                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5905                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5906
5907                 /* add HMAC_ALGO parameter */
5908                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5909                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5910                     (uint8_t *) hmacs->hmac_ids);
5911                 if (p_len > 0) {
5912                         p_len += sizeof(*hmacs);
5913                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5914                         hmacs->ph.param_length = htons(p_len);
5915                         /* zero out any padding required */
5916                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5917                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5918                 }
5919                 /* add CHUNKS parameter */
5920                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5921                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5922                     chunks->chunk_types);
5923                 if (p_len > 0) {
5924                         p_len += sizeof(*chunks);
5925                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5926                         chunks->ph.param_length = htons(p_len);
5927                         /* zero out any padding required */
5928                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5929                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5930                 }
5931         }
5932         m_at = m;
5933         /* now the addresses */
5934         {
5935                 struct sctp_scoping scp;
5936
5937                 /*
5938                  * To optimize this we could put the scoping stuff into a
5939                  * structure and remove the individual uint8's from the stc
5940                  * structure. Then we could just sifa in the address within
5941                  * the stc.. but for now this is a quick hack to get the
5942                  * address stuff teased apart.
5943                  */
5944                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5945                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5946                 scp.loopback_scope = stc.loopback_scope;
5947                 scp.ipv4_local_scope = stc.ipv4_scope;
5948                 scp.local_scope = stc.local_scope;
5949                 scp.site_scope = stc.site_scope;
5950                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5951         }
5952
5953         /* tack on the operational error if present */
5954         if (op_err) {
5955                 struct mbuf *ol;
5956                 int llen;
5957
5958                 llen = 0;
5959                 ol = op_err;
5960
5961                 while (ol) {
5962                         llen += SCTP_BUF_LEN(ol);
5963                         ol = SCTP_BUF_NEXT(ol);
5964                 }
5965                 if (llen % 4) {
5966                         /* must add a pad to the param */
5967                         uint32_t cpthis = 0;
5968                         int padlen;
5969
5970                         padlen = 4 - (llen % 4);
5971                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5972                 }
5973                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5974                         m_at = SCTP_BUF_NEXT(m_at);
5975                 }
5976                 SCTP_BUF_NEXT(m_at) = op_err;
5977                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5978                         m_at = SCTP_BUF_NEXT(m_at);
5979                 }
5980         }
5981         /* pre-calulate the size and update pkt header and chunk header */
5982         p_len = 0;
5983         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5984                 p_len += SCTP_BUF_LEN(m_tmp);
5985                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5986                         /* m_tmp should now point to last one */
5987                         break;
5988                 }
5989         }
5990
5991         /* Now we must build a cookie */
5992         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5993         if (m_cookie == NULL) {
5994                 /* memory problem */
5995                 sctp_m_freem(m);
5996                 return;
5997         }
5998         /* Now append the cookie to the end and update the space/size */
5999         SCTP_BUF_NEXT(m_tmp) = m_cookie;
6000
6001         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6002                 p_len += SCTP_BUF_LEN(m_tmp);
6003                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6004                         /* m_tmp should now point to last one */
6005                         mp_last = m_tmp;
6006                         break;
6007                 }
6008         }
6009         /*
6010          * Place in the size, but we don't include the last pad (if any) in
6011          * the INIT-ACK.
6012          */
6013         initack->ch.chunk_length = htons(p_len);
6014
6015         /*
6016          * Time to sign the cookie, we don't sign over the cookie signature
6017          * though thus we set trailer.
6018          */
6019         (void)sctp_hmac_m(SCTP_HMAC,
6020             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6021             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6022             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6023         /*
6024          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6025          * here since the timer will drive a retranmission.
6026          */
6027         padval = p_len % 4;
6028         if ((padval) && (mp_last)) {
6029                 /* see my previous comments on mp_last */
6030                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
6031                         /* Houston we have a problem, no space */
6032                         sctp_m_freem(m);
6033                         return;
6034                 }
6035         }
6036         if (stc.loopback_scope) {
6037                 over_addr = &store1;
6038         } else {
6039                 over_addr = NULL;
6040         }
6041
6042         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6043             0, 0,
6044             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6045             port, over_addr,
6046             use_mflowid, mflowid,
6047             SCTP_SO_NOT_LOCKED);
6048         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6049 }
6050
6051
6052 static void
6053 sctp_prune_prsctp(struct sctp_tcb *stcb,
6054     struct sctp_association *asoc,
6055     struct sctp_sndrcvinfo *srcv,
6056     int dataout)
6057 {
6058         int freed_spc = 0;
6059         struct sctp_tmit_chunk *chk, *nchk;
6060
6061         SCTP_TCB_LOCK_ASSERT(stcb);
6062         if ((asoc->peer_supports_prsctp) &&
6063             (asoc->sent_queue_cnt_removeable > 0)) {
6064                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6065                         /*
6066                          * Look for chunks marked with the PR_SCTP flag AND
6067                          * the buffer space flag. If the one being sent is
6068                          * equal or greater priority then purge the old one
6069                          * and free some space.
6070                          */
6071                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6072                                 /*
6073                                  * This one is PR-SCTP AND buffer space
6074                                  * limited type
6075                                  */
6076                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6077                                         /*
6078                                          * Lower numbers equates to higher
6079                                          * priority so if the one we are
6080                                          * looking at has a larger or equal
6081                                          * priority we want to drop the data
6082                                          * and NOT retransmit it.
6083                                          */
6084                                         if (chk->data) {
6085                                                 /*
6086                                                  * We release the book_size
6087                                                  * if the mbuf is here
6088                                                  */
6089                                                 int ret_spc;
6090                                                 uint8_t sent;
6091
6092                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6093                                                         sent = 1;
6094                                                 else
6095                                                         sent = 0;
6096                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6097                                                     sent,
6098                                                     SCTP_SO_LOCKED);
6099                                                 freed_spc += ret_spc;
6100                                                 if (freed_spc >= dataout) {
6101                                                         return;
6102                                                 }
6103                                         }       /* if chunk was present */
6104                                 }       /* if of sufficent priority */
6105                         }       /* if chunk has enabled */
6106                 }               /* tailqforeach */
6107
6108                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6109                         /* Here we must move to the sent queue and mark */
6110                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6111                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6112                                         if (chk->data) {
6113                                                 /*
6114                                                  * We release the book_size
6115                                                  * if the mbuf is here
6116                                                  */
6117                                                 int ret_spc;
6118
6119                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6120                                                     0, SCTP_SO_LOCKED);
6121
6122                                                 freed_spc += ret_spc;
6123                                                 if (freed_spc >= dataout) {
6124                                                         return;
6125                                                 }
6126                                         }       /* end if chk->data */
6127                                 }       /* end if right class */
6128                         }       /* end if chk pr-sctp */
6129                 }               /* tailqforeachsafe (chk) */
6130         }                       /* if enabled in asoc */
6131 }
6132
6133 int
6134 sctp_get_frag_point(struct sctp_tcb *stcb,
6135     struct sctp_association *asoc)
6136 {
6137         int siz, ovh;
6138
6139         /*
6140          * For endpoints that have both v6 and v4 addresses we must reserve
6141          * room for the ipv6 header, for those that are only dealing with V4
6142          * we use a larger frag point.
6143          */
6144         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6145                 ovh = SCTP_MED_OVERHEAD;
6146         } else {
6147                 ovh = SCTP_MED_V4_OVERHEAD;
6148         }
6149
6150         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6151                 siz = asoc->smallest_mtu - ovh;
6152         else
6153                 siz = (stcb->asoc.sctp_frag_point - ovh);
6154         /*
6155          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6156          */
6157         /* A data chunk MUST fit in a cluster */
6158         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6159         /* } */
6160
6161         /* adjust for an AUTH chunk if DATA requires auth */
6162         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6163                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6164
6165         if (siz % 4) {
6166                 /* make it an even word boundary please */
6167                 siz -= (siz % 4);
6168         }
6169         return (siz);
6170 }
6171
6172 static void
6173 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6174 {
6175         sp->pr_sctp_on = 0;
6176         /*
6177          * We assume that the user wants PR_SCTP_TTL if the user provides a
6178          * positive lifetime but does not specify any PR_SCTP policy. This
6179          * is a BAD assumption and causes problems at least with the
6180          * U-Vancovers MPI folks. I will change this to be no policy means
6181          * NO PR-SCTP.
6182          */
6183         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6184                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6185                 sp->pr_sctp_on = 1;
6186         } else {
6187                 return;
6188         }
6189         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6190         case CHUNK_FLAGS_PR_SCTP_BUF:
6191                 /*
6192                  * Time to live is a priority stored in tv_sec when doing
6193                  * the buffer drop thing.
6194                  */
6195                 sp->ts.tv_sec = sp->timetolive;
6196                 sp->ts.tv_usec = 0;
6197                 break;
6198         case CHUNK_FLAGS_PR_SCTP_TTL:
6199                 {
6200                         struct timeval tv;
6201
6202                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6203                         tv.tv_sec = sp->timetolive / 1000;
6204                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6205                         /*
6206                          * TODO sctp_constants.h needs alternative time
6207                          * macros when _KERNEL is undefined.
6208                          */
6209                         timevaladd(&sp->ts, &tv);
6210                 }
6211                 break;
6212         case CHUNK_FLAGS_PR_SCTP_RTX:
6213                 /*
6214                  * Time to live is a the number or retransmissions stored in
6215                  * tv_sec.
6216                  */
6217                 sp->ts.tv_sec = sp->timetolive;
6218                 sp->ts.tv_usec = 0;
6219                 break;
6220         default:
6221                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6222                     "Unknown PR_SCTP policy %u.\n",
6223                     PR_SCTP_POLICY(sp->sinfo_flags));
6224                 break;
6225         }
6226 }
6227
6228 static int
6229 sctp_msg_append(struct sctp_tcb *stcb,
6230     struct sctp_nets *net,
6231     struct mbuf *m,
6232     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6233 {
6234         int error = 0;
6235         struct mbuf *at;
6236         struct sctp_stream_queue_pending *sp = NULL;
6237         struct sctp_stream_out *strm;
6238
6239         /*
6240          * Given an mbuf chain, put it into the association send queue and
6241          * place it on the wheel
6242          */
6243         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6244                 /* Invalid stream number */
6245                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6246                 error = EINVAL;
6247                 goto out_now;
6248         }
6249         if ((stcb->asoc.stream_locked) &&
6250             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6251                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6252                 error = EINVAL;
6253                 goto out_now;
6254         }
6255         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6256         /* Now can we send this? */
6257         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6258             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6259             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6260             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6261                 /* got data while shutting down */
6262                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6263                 error = ECONNRESET;
6264                 goto out_now;
6265         }
6266         sctp_alloc_a_strmoq(stcb, sp);
6267         if (sp == NULL) {
6268                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6269                 error = ENOMEM;
6270                 goto out_now;
6271         }
6272         sp->sinfo_flags = srcv->sinfo_flags;
6273         sp->timetolive = srcv->sinfo_timetolive;
6274         sp->ppid = srcv->sinfo_ppid;
6275         sp->context = srcv->sinfo_context;
6276         sp->strseq = 0;
6277         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6278                 sp->net = net;
6279                 atomic_add_int(&sp->net->ref_count, 1);
6280         } else {
6281                 sp->net = NULL;
6282         }
6283         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6284         sp->stream = srcv->sinfo_stream;
6285         sp->msg_is_complete = 1;
6286         sp->sender_all_done = 1;
6287         sp->some_taken = 0;
6288         sp->data = m;
6289         sp->tail_mbuf = NULL;
6290         sctp_set_prsctp_policy(sp);
6291         /*
6292          * We could in theory (for sendall) sifa the length in, but we would
6293          * still have to hunt through the chain since we need to setup the
6294          * tail_mbuf
6295          */
6296         sp->length = 0;
6297         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6298                 if (SCTP_BUF_NEXT(at) == NULL)
6299                         sp->tail_mbuf = at;
6300                 sp->length += SCTP_BUF_LEN(at);
6301         }
6302         if (srcv->sinfo_keynumber_valid) {
6303                 sp->auth_keyid = srcv->sinfo_keynumber;
6304         } else {
6305                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6306         }
6307         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6308                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6309                 sp->holds_key_ref = 1;
6310         }
6311         if (hold_stcb_lock == 0) {
6312                 SCTP_TCB_SEND_LOCK(stcb);
6313         }
6314         sctp_snd_sb_alloc(stcb, sp->length);
6315         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6316         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6317         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6318                 sp->strseq = strm->next_sequence_sent;
6319                 strm->next_sequence_sent++;
6320         }
6321         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6322         m = NULL;
6323         if (hold_stcb_lock == 0) {
6324                 SCTP_TCB_SEND_UNLOCK(stcb);
6325         }
6326 out_now:
6327         if (m) {
6328                 sctp_m_freem(m);
6329         }
6330         return (error);
6331 }
6332
6333
6334 static struct mbuf *
6335 sctp_copy_mbufchain(struct mbuf *clonechain,
6336     struct mbuf *outchain,
6337     struct mbuf **endofchain,
6338     int can_take_mbuf,
6339     int sizeofcpy,
6340     uint8_t copy_by_ref)
6341 {
6342         struct mbuf *m;
6343         struct mbuf *appendchain;
6344         caddr_t cp;
6345         int len;
6346
6347         if (endofchain == NULL) {
6348                 /* error */
6349 error_out:
6350                 if (outchain)
6351                         sctp_m_freem(outchain);
6352                 return (NULL);
6353         }
6354         if (can_take_mbuf) {
6355                 appendchain = clonechain;
6356         } else {
6357                 if (!copy_by_ref &&
6358                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6359                     ) {
6360                         /* Its not in a cluster */
6361                         if (*endofchain == NULL) {
6362                                 /* lets get a mbuf cluster */
6363                                 if (outchain == NULL) {
6364                                         /* This is the general case */
6365                         new_mbuf:
6366                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6367                                         if (outchain == NULL) {
6368                                                 goto error_out;
6369                                         }
6370                                         SCTP_BUF_LEN(outchain) = 0;
6371                                         *endofchain = outchain;
6372                                         /* get the prepend space */
6373                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6374                                 } else {
6375                                         /*
6376                                          * We really should not get a NULL
6377                                          * in endofchain
6378                                          */
6379                                         /* find end */
6380                                         m = outchain;
6381                                         while (m) {
6382                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6383                                                         *endofchain = m;
6384                                                         break;
6385                                                 }
6386                                                 m = SCTP_BUF_NEXT(m);
6387                                         }
6388                                         /* sanity */
6389                                         if (*endofchain == NULL) {
6390                                                 /*
6391                                                  * huh, TSNH XXX maybe we
6392                                                  * should panic
6393                                                  */
6394                                                 sctp_m_freem(outchain);
6395                                                 goto new_mbuf;
6396                                         }
6397                                 }
6398                                 /* get the new end of length */
6399                                 len = M_TRAILINGSPACE(*endofchain);
6400                         } else {
6401                                 /* how much is left at the end? */
6402                                 len = M_TRAILINGSPACE(*endofchain);
6403                         }
6404                         /* Find the end of the data, for appending */
6405                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6406
6407                         /* Now lets copy it out */
6408                         if (len >= sizeofcpy) {
6409                                 /* It all fits, copy it in */
6410                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6411                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6412                         } else {
6413                                 /* fill up the end of the chain */
6414                                 if (len > 0) {
6415                                         m_copydata(clonechain, 0, len, cp);
6416                                         SCTP_BUF_LEN((*endofchain)) += len;
6417                                         /* now we need another one */
6418                                         sizeofcpy -= len;
6419                                 }
6420                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6421                                 if (m == NULL) {
6422                                         /* We failed */
6423                                         goto error_out;
6424                                 }
6425                                 SCTP_BUF_NEXT((*endofchain)) = m;
6426                                 *endofchain = m;
6427                                 cp = mtod((*endofchain), caddr_t);
6428                                 m_copydata(clonechain, len, sizeofcpy, cp);
6429                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6430                         }
6431                         return (outchain);
6432                 } else {
6433                         /* copy the old fashion way */
6434                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6435 #ifdef SCTP_MBUF_LOGGING
6436                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6437                                 struct mbuf *mat;
6438
6439                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6440                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6441                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6442                                         }
6443                                 }
6444                         }
6445 #endif
6446                 }
6447         }
6448         if (appendchain == NULL) {
6449                 /* error */
6450                 if (outchain)
6451                         sctp_m_freem(outchain);
6452                 return (NULL);
6453         }
6454         if (outchain) {
6455                 /* tack on to the end */
6456                 if (*endofchain != NULL) {
6457                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6458                 } else {
6459                         m = outchain;
6460                         while (m) {
6461                                 if (SCTP_BUF_NEXT(m) == NULL) {
6462                                         SCTP_BUF_NEXT(m) = appendchain;
6463                                         break;
6464                                 }
6465                                 m = SCTP_BUF_NEXT(m);
6466                         }
6467                 }
6468                 /*
6469                  * save off the end and update the end-chain postion
6470                  */
6471                 m = appendchain;
6472                 while (m) {
6473                         if (SCTP_BUF_NEXT(m) == NULL) {
6474                                 *endofchain = m;
6475                                 break;
6476                         }
6477                         m = SCTP_BUF_NEXT(m);
6478                 }
6479                 return (outchain);
6480         } else {
6481                 /* save off the end and update the end-chain postion */
6482                 m = appendchain;
6483                 while (m) {
6484                         if (SCTP_BUF_NEXT(m) == NULL) {
6485                                 *endofchain = m;
6486                                 break;
6487                         }
6488                         m = SCTP_BUF_NEXT(m);
6489                 }
6490                 return (appendchain);
6491         }
6492 }
6493
6494 int
6495 sctp_med_chunk_output(struct sctp_inpcb *inp,
6496     struct sctp_tcb *stcb,
6497     struct sctp_association *asoc,
6498     int *num_out,
6499     int *reason_code,
6500     int control_only, int from_where,
6501     struct timeval *now, int *now_filled, int frag_point, int so_locked
6502 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6503     SCTP_UNUSED
6504 #endif
6505 );
6506
6507 static void
6508 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6509     uint32_t val SCTP_UNUSED)
6510 {
6511         struct sctp_copy_all *ca;
6512         struct mbuf *m;
6513         int ret = 0;
6514         int added_control = 0;
6515         int un_sent, do_chunk_output = 1;
6516         struct sctp_association *asoc;
6517         struct sctp_nets *net;
6518
6519         ca = (struct sctp_copy_all *)ptr;
6520         if (ca->m == NULL) {
6521                 return;
6522         }
6523         if (ca->inp != inp) {
6524                 /* TSNH */
6525                 return;
6526         }
6527         if ((ca->m) && ca->sndlen) {
6528                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6529                 if (m == NULL) {
6530                         /* can't copy so we are done */
6531                         ca->cnt_failed++;
6532                         return;
6533                 }
6534 #ifdef SCTP_MBUF_LOGGING
6535                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6536                         struct mbuf *mat;
6537
6538                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6539                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6540                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6541                                 }
6542                         }
6543                 }
6544 #endif
6545         } else {
6546                 m = NULL;
6547         }
6548         SCTP_TCB_LOCK_ASSERT(stcb);
6549         if (stcb->asoc.alternate) {
6550                 net = stcb->asoc.alternate;
6551         } else {
6552                 net = stcb->asoc.primary_destination;
6553         }
6554         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6555                 /* Abort this assoc with m as the user defined reason */
6556                 if (m) {
6557                         struct sctp_paramhdr *ph;
6558
6559                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6560                         if (m) {
6561                                 ph = mtod(m, struct sctp_paramhdr *);
6562                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6563                                 ph->param_length = htons(ca->sndlen);
6564                         }
6565                         /*
6566                          * We add one here to keep the assoc from
6567                          * dis-appearing on us.
6568                          */
6569                         atomic_add_int(&stcb->asoc.refcnt, 1);
6570                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6571                         /*
6572                          * sctp_abort_an_association calls sctp_free_asoc()
6573                          * free association will NOT free it since we
6574                          * incremented the refcnt .. we do this to prevent
6575                          * it being freed and things getting tricky since we
6576                          * could end up (from free_asoc) calling inpcb_free
6577                          * which would get a recursive lock call to the
6578                          * iterator lock.. But as a consequence of that the
6579                          * stcb will return to us un-locked.. since
6580                          * free_asoc returns with either no TCB or the TCB
6581                          * unlocked, we must relock.. to unlock in the
6582                          * iterator timer :-0
6583                          */
6584                         SCTP_TCB_LOCK(stcb);
6585                         atomic_add_int(&stcb->asoc.refcnt, -1);
6586                         goto no_chunk_output;
6587                 }
6588         } else {
6589                 if (m) {
6590                         ret = sctp_msg_append(stcb, net, m,
6591                             &ca->sndrcv, 1);
6592                 }
6593                 asoc = &stcb->asoc;
6594                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6595                         /* shutdown this assoc */
6596                         int cnt;
6597
6598                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6599
6600                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6601                             TAILQ_EMPTY(&asoc->sent_queue) &&
6602                             (cnt == 0)) {
6603                                 if (asoc->locked_on_sending) {
6604                                         goto abort_anyway;
6605                                 }
6606                                 /*
6607                                  * there is nothing queued to send, so I'm
6608                                  * done...
6609                                  */
6610                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6611                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6612                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6613                                         /*
6614                                          * only send SHUTDOWN the first time
6615                                          * through
6616                                          */
6617                                         sctp_send_shutdown(stcb, net);
6618                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6619                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6620                                         }
6621                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6622                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6623                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6624                                             net);
6625                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6626                                             asoc->primary_destination);
6627                                         added_control = 1;
6628                                         do_chunk_output = 0;
6629                                 }
6630                         } else {
6631                                 /*
6632                                  * we still got (or just got) data to send,
6633                                  * so set SHUTDOWN_PENDING
6634                                  */
6635                                 /*
6636                                  * XXX sockets draft says that SCTP_EOF
6637                                  * should be sent with no data.  currently,
6638                                  * we will allow user data to be sent first
6639                                  * and move to SHUTDOWN-PENDING
6640                                  */
6641                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6642                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6643                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6644                                         if (asoc->locked_on_sending) {
6645                                                 /*
6646                                                  * Locked to send out the
6647                                                  * data
6648                                                  */
6649                                                 struct sctp_stream_queue_pending *sp;
6650
6651                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6652                                                 if (sp) {
6653                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6654                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6655                                                 }
6656                                         }
6657                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6658                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6659                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6660                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6661                                 abort_anyway:
6662                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6663                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6664                                                     NULL, SCTP_SO_NOT_LOCKED);
6665                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6666                                                 goto no_chunk_output;
6667                                         }
6668                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6669                                             asoc->primary_destination);
6670                                 }
6671                         }
6672
6673                 }
6674         }
6675         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6676             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6677
6678         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6679             (stcb->asoc.total_flight > 0) &&
6680             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6681             ) {
6682                 do_chunk_output = 0;
6683         }
6684         if (do_chunk_output)
6685                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6686         else if (added_control) {
6687                 int num_out = 0, reason = 0, now_filled = 0;
6688                 struct timeval now;
6689                 int frag_point;
6690
6691                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6692                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6693                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6694         }
6695 no_chunk_output:
6696         if (ret) {
6697                 ca->cnt_failed++;
6698         } else {
6699                 ca->cnt_sent++;
6700         }
6701 }
6702
6703 static void
6704 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6705 {
6706         struct sctp_copy_all *ca;
6707
6708         ca = (struct sctp_copy_all *)ptr;
6709         /*
6710          * Do a notify here? Kacheong suggests that the notify be done at
6711          * the send time.. so you would push up a notification if any send
6712          * failed. Don't know if this is feasable since the only failures we
6713          * have is "memory" related and if you cannot get an mbuf to send
6714          * the data you surely can't get an mbuf to send up to notify the
6715          * user you can't send the data :->
6716          */
6717
6718         /* now free everything */
6719         sctp_m_freem(ca->m);
6720         SCTP_FREE(ca, SCTP_M_COPYAL);
6721 }
6722
6723
6724 #define MC_ALIGN(m, len) do {                                           \
6725         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6726 } while (0)
6727
6728
6729
6730 static struct mbuf *
6731 sctp_copy_out_all(struct uio *uio, int len)
6732 {
6733         struct mbuf *ret, *at;
6734         int left, willcpy, cancpy, error;
6735
6736         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6737         if (ret == NULL) {
6738                 /* TSNH */
6739                 return (NULL);
6740         }
6741         left = len;
6742         SCTP_BUF_LEN(ret) = 0;
6743         /* save space for the data chunk header */
6744         cancpy = M_TRAILINGSPACE(ret);
6745         willcpy = min(cancpy, left);
6746         at = ret;
6747         while (left > 0) {
6748                 /* Align data to the end */
6749                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6750                 if (error) {
6751         err_out_now:
6752                         sctp_m_freem(at);
6753                         return (NULL);
6754                 }
6755                 SCTP_BUF_LEN(at) = willcpy;
6756                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6757                 left -= willcpy;
6758                 if (left > 0) {
6759                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6760                         if (SCTP_BUF_NEXT(at) == NULL) {
6761                                 goto err_out_now;
6762                         }
6763                         at = SCTP_BUF_NEXT(at);
6764                         SCTP_BUF_LEN(at) = 0;
6765                         cancpy = M_TRAILINGSPACE(at);
6766                         willcpy = min(cancpy, left);
6767                 }
6768         }
6769         return (ret);
6770 }
6771
6772 static int
6773 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6774     struct sctp_sndrcvinfo *srcv)
6775 {
6776         int ret;
6777         struct sctp_copy_all *ca;
6778
6779         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6780             SCTP_M_COPYAL);
6781         if (ca == NULL) {
6782                 sctp_m_freem(m);
6783                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6784                 return (ENOMEM);
6785         }
6786         memset(ca, 0, sizeof(struct sctp_copy_all));
6787
6788         ca->inp = inp;
6789         if (srcv) {
6790                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6791         }
6792         /*
6793          * take off the sendall flag, it would be bad if we failed to do
6794          * this :-0
6795          */
6796         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6797         /* get length and mbuf chain */
6798         if (uio) {
6799                 ca->sndlen = uio->uio_resid;
6800                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6801                 if (ca->m == NULL) {
6802                         SCTP_FREE(ca, SCTP_M_COPYAL);
6803                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6804                         return (ENOMEM);
6805                 }
6806         } else {
6807                 /* Gather the length of the send */
6808                 struct mbuf *mat;
6809
6810                 mat = m;
6811                 ca->sndlen = 0;
6812                 while (m) {
6813                         ca->sndlen += SCTP_BUF_LEN(m);
6814                         m = SCTP_BUF_NEXT(m);
6815                 }
6816                 ca->m = mat;
6817         }
6818         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6819             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6820             SCTP_ASOC_ANY_STATE,
6821             (void *)ca, 0,
6822             sctp_sendall_completes, inp, 1);
6823         if (ret) {
6824                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6825                 SCTP_FREE(ca, SCTP_M_COPYAL);
6826                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6827                 return (EFAULT);
6828         }
6829         return (0);
6830 }
6831
6832
6833 void
6834 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6835 {
6836         struct sctp_tmit_chunk *chk, *nchk;
6837
6838         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6839                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6840                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6841                         if (chk->data) {
6842                                 sctp_m_freem(chk->data);
6843                                 chk->data = NULL;
6844                         }
6845                         asoc->ctrl_queue_cnt--;
6846                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6847                 }
6848         }
6849 }
6850
6851 void
6852 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6853 {
6854         struct sctp_association *asoc;
6855         struct sctp_tmit_chunk *chk, *nchk;
6856         struct sctp_asconf_chunk *acp;
6857
6858         asoc = &stcb->asoc;
6859         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6860                 /* find SCTP_ASCONF chunk in queue */
6861                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6862                         if (chk->data) {
6863                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6864                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6865                                         /* Not Acked yet */
6866                                         break;
6867                                 }
6868                         }
6869                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6870                         if (chk->data) {
6871                                 sctp_m_freem(chk->data);
6872                                 chk->data = NULL;
6873                         }
6874                         asoc->ctrl_queue_cnt--;
6875                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6876                 }
6877         }
6878 }
6879
6880
6881 static void
6882 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6883     struct sctp_association *asoc,
6884     struct sctp_tmit_chunk **data_list,
6885     int bundle_at,
6886     struct sctp_nets *net)
6887 {
6888         int i;
6889         struct sctp_tmit_chunk *tp1;
6890
6891         for (i = 0; i < bundle_at; i++) {
6892                 /* off of the send queue */
6893                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6894                 asoc->send_queue_cnt--;
6895                 if (i > 0) {
6896                         /*
6897                          * Any chunk NOT 0 you zap the time chunk 0 gets
6898                          * zapped or set based on if a RTO measurment is
6899                          * needed.
6900                          */
6901                         data_list[i]->do_rtt = 0;
6902                 }
6903                 /* record time */
6904                 data_list[i]->sent_rcv_time = net->last_sent_time;
6905                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6906                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6907                 if (data_list[i]->whoTo == NULL) {
6908                         data_list[i]->whoTo = net;
6909                         atomic_add_int(&net->ref_count, 1);
6910                 }
6911                 /* on to the sent queue */
6912                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6913                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6914                         struct sctp_tmit_chunk *tpp;
6915
6916                         /* need to move back */
6917         back_up_more:
6918                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6919                         if (tpp == NULL) {
6920                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6921                                 goto all_done;
6922                         }
6923                         tp1 = tpp;
6924                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6925                                 goto back_up_more;
6926                         }
6927                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6928                 } else {
6929                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6930                             data_list[i],
6931                             sctp_next);
6932                 }
6933 all_done:
6934                 /* This does not lower until the cum-ack passes it */
6935                 asoc->sent_queue_cnt++;
6936                 if ((asoc->peers_rwnd <= 0) &&
6937                     (asoc->total_flight == 0) &&
6938                     (bundle_at == 1)) {
6939                         /* Mark the chunk as being a window probe */
6940                         SCTP_STAT_INCR(sctps_windowprobed);
6941                 }
6942 #ifdef SCTP_AUDITING_ENABLED
6943                 sctp_audit_log(0xC2, 3);
6944 #endif
6945                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6946                 data_list[i]->snd_count = 1;
6947                 data_list[i]->rec.data.chunk_was_revoked = 0;
6948                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6949                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6950                             data_list[i]->whoTo->flight_size,
6951                             data_list[i]->book_size,
6952                             (uintptr_t) data_list[i]->whoTo,
6953                             data_list[i]->rec.data.TSN_seq);
6954                 }
6955                 sctp_flight_size_increase(data_list[i]);
6956                 sctp_total_flight_increase(stcb, data_list[i]);
6957                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6958                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6959                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6960                 }
6961                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6962                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6963                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6964                         /* SWS sender side engages */
6965                         asoc->peers_rwnd = 0;
6966                 }
6967         }
6968         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6969                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6970         }
6971 }
6972
6973 static void
6974 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6975 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6976     SCTP_UNUSED
6977 #endif
6978 )
6979 {
6980         struct sctp_tmit_chunk *chk, *nchk;
6981
6982         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6983                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6984                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6985                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6986                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6987                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6988                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6989                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6990                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6991                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6992                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6993                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6994                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6995                         /* Stray chunks must be cleaned up */
6996         clean_up_anyway:
6997                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6998                         if (chk->data) {
6999                                 sctp_m_freem(chk->data);
7000                                 chk->data = NULL;
7001                         }
7002                         asoc->ctrl_queue_cnt--;
7003                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7004                                 asoc->fwd_tsn_cnt--;
7005                         sctp_free_a_chunk(stcb, chk, so_locked);
7006                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7007                         /* special handling, we must look into the param */
7008                         if (chk != asoc->str_reset) {
7009                                 goto clean_up_anyway;
7010                         }
7011                 }
7012         }
7013 }
7014
7015
7016 static int
7017 sctp_can_we_split_this(struct sctp_tcb *stcb,
7018     uint32_t length,
7019     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7020 {
7021         /*
7022          * Make a decision on if I should split a msg into multiple parts.
7023          * This is only asked of incomplete messages.
7024          */
7025         if (eeor_on) {
7026                 /*
7027                  * If we are doing EEOR we need to always send it if its the
7028                  * entire thing, since it might be all the guy is putting in
7029                  * the hopper.
7030                  */
7031                 if (goal_mtu >= length) {
7032                         /*-
7033                          * If we have data outstanding,
7034                          * we get another chance when the sack
7035                          * arrives to transmit - wait for more data
7036                          */
7037                         if (stcb->asoc.total_flight == 0) {
7038                                 /*
7039                                  * If nothing is in flight, we zero the
7040                                  * packet counter.
7041                                  */
7042                                 return (length);
7043                         }
7044                         return (0);
7045
7046                 } else {
7047                         /* You can fill the rest */
7048                         return (goal_mtu);
7049                 }
7050         }
7051         /*-
7052          * For those strange folk that make the send buffer
7053          * smaller than our fragmentation point, we can't
7054          * get a full msg in so we have to allow splitting.
7055          */
7056         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7057                 return (length);
7058         }
7059         if ((length <= goal_mtu) ||
7060             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7061                 /* Sub-optimial residual don't split in non-eeor mode. */
7062                 return (0);
7063         }
7064         /*
7065          * If we reach here length is larger than the goal_mtu. Do we wish
7066          * to split it for the sake of packet putting together?
7067          */
7068         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7069                 /* Its ok to split it */
7070                 return (min(goal_mtu, frag_point));
7071         }
7072         /* Nope, can't split */
7073         return (0);
7074
7075 }
7076
7077 static uint32_t
7078 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7079     struct sctp_stream_out *strq,
7080     uint32_t goal_mtu,
7081     uint32_t frag_point,
7082     int *locked,
7083     int *giveup,
7084     int eeor_mode,
7085     int *bail,
7086     int so_locked
7087 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7088     SCTP_UNUSED
7089 #endif
7090 )
7091 {
7092         /* Move from the stream to the send_queue keeping track of the total */
7093         struct sctp_association *asoc;
7094         struct sctp_stream_queue_pending *sp;
7095         struct sctp_tmit_chunk *chk;
7096         struct sctp_data_chunk *dchkh;
7097         uint32_t to_move, length;
7098         uint8_t rcv_flags = 0;
7099         uint8_t some_taken;
7100         uint8_t send_lock_up = 0;
7101
7102         SCTP_TCB_LOCK_ASSERT(stcb);
7103         asoc = &stcb->asoc;
7104 one_more_time:
7105         /* sa_ignore FREED_MEMORY */
7106         sp = TAILQ_FIRST(&strq->outqueue);
7107         if (sp == NULL) {
7108                 *locked = 0;
7109                 if (send_lock_up == 0) {
7110                         SCTP_TCB_SEND_LOCK(stcb);
7111                         send_lock_up = 1;
7112                 }
7113                 sp = TAILQ_FIRST(&strq->outqueue);
7114                 if (sp) {
7115                         goto one_more_time;
7116                 }
7117                 if (strq->last_msg_incomplete) {
7118                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7119                             strq->stream_no,
7120                             strq->last_msg_incomplete);
7121                         strq->last_msg_incomplete = 0;
7122                 }
7123                 to_move = 0;
7124                 if (send_lock_up) {
7125                         SCTP_TCB_SEND_UNLOCK(stcb);
7126                         send_lock_up = 0;
7127                 }
7128                 goto out_of;
7129         }
7130         if ((sp->msg_is_complete) && (sp->length == 0)) {
7131                 if (sp->sender_all_done) {
7132                         /*
7133                          * We are doing differed cleanup. Last time through
7134                          * when we took all the data the sender_all_done was
7135                          * not set.
7136                          */
7137                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7138                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7139                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7140                                     sp->sender_all_done,
7141                                     sp->length,
7142                                     sp->msg_is_complete,
7143                                     sp->put_last_out,
7144                                     send_lock_up);
7145                         }
7146                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7147                                 SCTP_TCB_SEND_LOCK(stcb);
7148                                 send_lock_up = 1;
7149                         }
7150                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7151                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7152                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7153                         if (sp->net) {
7154                                 sctp_free_remote_addr(sp->net);
7155                                 sp->net = NULL;
7156                         }
7157                         if (sp->data) {
7158                                 sctp_m_freem(sp->data);
7159                                 sp->data = NULL;
7160                         }
7161                         sctp_free_a_strmoq(stcb, sp, so_locked);
7162                         /* we can't be locked to it */
7163                         *locked = 0;
7164                         stcb->asoc.locked_on_sending = NULL;
7165                         if (send_lock_up) {
7166                                 SCTP_TCB_SEND_UNLOCK(stcb);
7167                                 send_lock_up = 0;
7168                         }
7169                         /* back to get the next msg */
7170                         goto one_more_time;
7171                 } else {
7172                         /*
7173                          * sender just finished this but still holds a
7174                          * reference
7175                          */
7176                         *locked = 1;
7177                         *giveup = 1;
7178                         to_move = 0;
7179                         goto out_of;
7180                 }
7181         } else {
7182                 /* is there some to get */
7183                 if (sp->length == 0) {
7184                         /* no */
7185                         *locked = 1;
7186                         *giveup = 1;
7187                         to_move = 0;
7188                         goto out_of;
7189                 } else if (sp->discard_rest) {
7190                         if (send_lock_up == 0) {
7191                                 SCTP_TCB_SEND_LOCK(stcb);
7192                                 send_lock_up = 1;
7193                         }
7194                         /* Whack down the size */
7195                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7196                         if ((stcb->sctp_socket != NULL) && \
7197                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7198                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7199                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7200                         }
7201                         if (sp->data) {
7202                                 sctp_m_freem(sp->data);
7203                                 sp->data = NULL;
7204                                 sp->tail_mbuf = NULL;
7205                         }
7206                         sp->length = 0;
7207                         sp->some_taken = 1;
7208                         *locked = 1;
7209                         *giveup = 1;
7210                         to_move = 0;
7211                         goto out_of;
7212                 }
7213         }
7214         some_taken = sp->some_taken;
7215         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7216                 sp->msg_is_complete = 1;
7217         }
7218 re_look:
7219         length = sp->length;
7220         if (sp->msg_is_complete) {
7221                 /* The message is complete */
7222                 to_move = min(length, frag_point);
7223                 if (to_move == length) {
7224                         /* All of it fits in the MTU */
7225                         if (sp->some_taken) {
7226                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7227                                 sp->put_last_out = 1;
7228                         } else {
7229                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7230                                 sp->put_last_out = 1;
7231                         }
7232                 } else {
7233                         /* Not all of it fits, we fragment */
7234                         if (sp->some_taken == 0) {
7235                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7236                         }
7237                         sp->some_taken = 1;
7238                 }
7239         } else {
7240                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7241                 if (to_move) {
7242                         /*-
7243                          * We use a snapshot of length in case it
7244                          * is expanding during the compare.
7245                          */
7246                         uint32_t llen;
7247
7248                         llen = length;
7249                         if (to_move >= llen) {
7250                                 to_move = llen;
7251                                 if (send_lock_up == 0) {
7252                                         /*-
7253                                          * We are taking all of an incomplete msg
7254                                          * thus we need a send lock.
7255                                          */
7256                                         SCTP_TCB_SEND_LOCK(stcb);
7257                                         send_lock_up = 1;
7258                                         if (sp->msg_is_complete) {
7259                                                 /*
7260                                                  * the sender finished the
7261                                                  * msg
7262                                                  */
7263                                                 goto re_look;
7264                                         }
7265                                 }
7266                         }
7267                         if (sp->some_taken == 0) {
7268                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7269                                 sp->some_taken = 1;
7270                         }
7271                 } else {
7272                         /* Nothing to take. */
7273                         if (sp->some_taken) {
7274                                 *locked = 1;
7275                         }
7276                         *giveup = 1;
7277                         to_move = 0;
7278                         goto out_of;
7279                 }
7280         }
7281
7282         /* If we reach here, we can copy out a chunk */
7283         sctp_alloc_a_chunk(stcb, chk);
7284         if (chk == NULL) {
7285                 /* No chunk memory */
7286                 *giveup = 1;
7287                 to_move = 0;
7288                 goto out_of;
7289         }
7290         /*
7291          * Setup for unordered if needed by looking at the user sent info
7292          * flags.
7293          */
7294         if (sp->sinfo_flags & SCTP_UNORDERED) {
7295                 rcv_flags |= SCTP_DATA_UNORDERED;
7296         }
7297         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7298             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7299                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7300         }
7301         /* clear out the chunk before setting up */
7302         memset(chk, 0, sizeof(*chk));
7303         chk->rec.data.rcv_flags = rcv_flags;
7304
7305         if (to_move >= length) {
7306                 /* we think we can steal the whole thing */
7307                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7308                         SCTP_TCB_SEND_LOCK(stcb);
7309                         send_lock_up = 1;
7310                 }
7311                 if (to_move < sp->length) {
7312                         /* bail, it changed */
7313                         goto dont_do_it;
7314                 }
7315                 chk->data = sp->data;
7316                 chk->last_mbuf = sp->tail_mbuf;
7317                 /* register the stealing */
7318                 sp->data = sp->tail_mbuf = NULL;
7319         } else {
7320                 struct mbuf *m;
7321
7322 dont_do_it:
7323                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7324                 chk->last_mbuf = NULL;
7325                 if (chk->data == NULL) {
7326                         sp->some_taken = some_taken;
7327                         sctp_free_a_chunk(stcb, chk, so_locked);
7328                         *bail = 1;
7329                         to_move = 0;
7330                         goto out_of;
7331                 }
7332 #ifdef SCTP_MBUF_LOGGING
7333                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7334                         struct mbuf *mat;
7335
7336                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7337                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7338                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7339                                 }
7340                         }
7341                 }
7342 #endif
7343                 /* Pull off the data */
7344                 m_adj(sp->data, to_move);
7345                 /* Now lets work our way down and compact it */
7346                 m = sp->data;
7347                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7348                         sp->data = SCTP_BUF_NEXT(m);
7349                         SCTP_BUF_NEXT(m) = NULL;
7350                         if (sp->tail_mbuf == m) {
7351                                 /*-
7352                                  * Freeing tail? TSNH since
7353                                  * we supposedly were taking less
7354                                  * than the sp->length.
7355                                  */
7356 #ifdef INVARIANTS
7357                                 panic("Huh, freing tail? - TSNH");
7358 #else
7359                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7360                                 sp->tail_mbuf = sp->data = NULL;
7361                                 sp->length = 0;
7362 #endif
7363
7364                         }
7365                         sctp_m_free(m);
7366                         m = sp->data;
7367                 }
7368         }
7369         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7370                 chk->copy_by_ref = 1;
7371         } else {
7372                 chk->copy_by_ref = 0;
7373         }
7374         /*
7375          * get last_mbuf and counts of mb useage This is ugly but hopefully
7376          * its only one mbuf.
7377          */
7378         if (chk->last_mbuf == NULL) {
7379                 chk->last_mbuf = chk->data;
7380                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7381                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7382                 }
7383         }
7384         if (to_move > length) {
7385                 /*- This should not happen either
7386                  * since we always lower to_move to the size
7387                  * of sp->length if its larger.
7388                  */
7389 #ifdef INVARIANTS
7390                 panic("Huh, how can to_move be larger?");
7391 #else
7392                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7393                 sp->length = 0;
7394 #endif
7395         } else {
7396                 atomic_subtract_int(&sp->length, to_move);
7397         }
7398         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7399                 /* Not enough room for a chunk header, get some */
7400                 struct mbuf *m;
7401
7402                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7403                 if (m == NULL) {
7404                         /*
7405                          * we're in trouble here. _PREPEND below will free
7406                          * all the data if there is no leading space, so we
7407                          * must put the data back and restore.
7408                          */
7409                         if (send_lock_up == 0) {
7410                                 SCTP_TCB_SEND_LOCK(stcb);
7411                                 send_lock_up = 1;
7412                         }
7413                         if (chk->data == NULL) {
7414                                 /* unsteal the data */
7415                                 sp->data = chk->data;
7416                                 sp->tail_mbuf = chk->last_mbuf;
7417                         } else {
7418                                 struct mbuf *m_tmp;
7419
7420                                 /* reassemble the data */
7421                                 m_tmp = sp->data;
7422                                 sp->data = chk->data;
7423                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7424                         }
7425                         sp->some_taken = some_taken;
7426                         atomic_add_int(&sp->length, to_move);
7427                         chk->data = NULL;
7428                         *bail = 1;
7429                         sctp_free_a_chunk(stcb, chk, so_locked);
7430                         to_move = 0;
7431                         goto out_of;
7432                 } else {
7433                         SCTP_BUF_LEN(m) = 0;
7434                         SCTP_BUF_NEXT(m) = chk->data;
7435                         chk->data = m;
7436                         M_ALIGN(chk->data, 4);
7437                 }
7438         }
7439         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7440         if (chk->data == NULL) {
7441                 /* HELP, TSNH since we assured it would not above? */
7442 #ifdef INVARIANTS
7443                 panic("prepend failes HELP?");
7444 #else
7445                 SCTP_PRINTF("prepend fails HELP?\n");
7446                 sctp_free_a_chunk(stcb, chk, so_locked);
7447 #endif
7448                 *bail = 1;
7449                 to_move = 0;
7450                 goto out_of;
7451         }
7452         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7453         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7454         chk->book_size_scale = 0;
7455         chk->sent = SCTP_DATAGRAM_UNSENT;
7456
7457         chk->flags = 0;
7458         chk->asoc = &stcb->asoc;
7459         chk->pad_inplace = 0;
7460         chk->no_fr_allowed = 0;
7461         chk->rec.data.stream_seq = sp->strseq;
7462         chk->rec.data.stream_number = sp->stream;
7463         chk->rec.data.payloadtype = sp->ppid;
7464         chk->rec.data.context = sp->context;
7465         chk->rec.data.doing_fast_retransmit = 0;
7466
7467         chk->rec.data.timetodrop = sp->ts;
7468         chk->flags = sp->act_flags;
7469
7470         if (sp->net) {
7471                 chk->whoTo = sp->net;
7472                 atomic_add_int(&chk->whoTo->ref_count, 1);
7473         } else
7474                 chk->whoTo = NULL;
7475
7476         if (sp->holds_key_ref) {
7477                 chk->auth_keyid = sp->auth_keyid;
7478                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7479                 chk->holds_key_ref = 1;
7480         }
7481         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7482         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7483                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7484                     (uintptr_t) stcb, sp->length,
7485                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7486                     chk->rec.data.TSN_seq);
7487         }
7488         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7489         /*
7490          * Put the rest of the things in place now. Size was done earlier in
7491          * previous loop prior to padding.
7492          */
7493
7494 #ifdef SCTP_ASOCLOG_OF_TSNS
7495         SCTP_TCB_LOCK_ASSERT(stcb);
7496         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7497                 asoc->tsn_out_at = 0;
7498                 asoc->tsn_out_wrapped = 1;
7499         }
7500         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7501         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7502         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7503         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7504         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7505         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7506         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7507         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7508         asoc->tsn_out_at++;
7509 #endif
7510
7511         dchkh->ch.chunk_type = SCTP_DATA;
7512         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7513         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7514         dchkh->dp.stream_id = htons(strq->stream_no);
7515         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7516         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7517         dchkh->ch.chunk_length = htons(chk->send_size);
7518         /* Now advance the chk->send_size by the actual pad needed. */
7519         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7520                 /* need a pad */
7521                 struct mbuf *lm;
7522                 int pads;
7523
7524                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7525                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7526                         chk->pad_inplace = 1;
7527                 }
7528                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7529                         /* pad added an mbuf */
7530                         chk->last_mbuf = lm;
7531                 }
7532                 chk->send_size += pads;
7533         }
7534         /* We only re-set the policy if it is on */
7535         if (sp->pr_sctp_on) {
7536                 sctp_set_prsctp_policy(sp);
7537                 asoc->pr_sctp_cnt++;
7538                 chk->pr_sctp_on = 1;
7539         } else {
7540                 chk->pr_sctp_on = 0;
7541         }
7542         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7543                 /* All done pull and kill the message */
7544                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7545                 if (sp->put_last_out == 0) {
7546                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7547                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7548                             sp->sender_all_done,
7549                             sp->length,
7550                             sp->msg_is_complete,
7551                             sp->put_last_out,
7552                             send_lock_up);
7553                 }
7554                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7555                         SCTP_TCB_SEND_LOCK(stcb);
7556                         send_lock_up = 1;
7557                 }
7558                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7559                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7560                 if (sp->net) {
7561                         sctp_free_remote_addr(sp->net);
7562                         sp->net = NULL;
7563                 }
7564                 if (sp->data) {
7565                         sctp_m_freem(sp->data);
7566                         sp->data = NULL;
7567                 }
7568                 sctp_free_a_strmoq(stcb, sp, so_locked);
7569
7570                 /* we can't be locked to it */
7571                 *locked = 0;
7572                 stcb->asoc.locked_on_sending = NULL;
7573         } else {
7574                 /* more to go, we are locked */
7575                 *locked = 1;
7576         }
7577         asoc->chunks_on_out_queue++;
7578         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7579         asoc->send_queue_cnt++;
7580 out_of:
7581         if (send_lock_up) {
7582                 SCTP_TCB_SEND_UNLOCK(stcb);
7583         }
7584         return (to_move);
7585 }
7586
7587
7588 static void
7589 sctp_fill_outqueue(struct sctp_tcb *stcb,
7590     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7591 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7592     SCTP_UNUSED
7593 #endif
7594 )
7595 {
7596         struct sctp_association *asoc;
7597         struct sctp_stream_out *strq;
7598         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7599         int locked, giveup;
7600
7601         SCTP_TCB_LOCK_ASSERT(stcb);
7602         asoc = &stcb->asoc;
7603         switch (net->ro._l_addr.sa.sa_family) {
7604 #ifdef INET
7605         case AF_INET:
7606                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7607                 break;
7608 #endif
7609 #ifdef INET6
7610         case AF_INET6:
7611                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7612                 break;
7613 #endif
7614         default:
7615                 /* TSNH */
7616                 goal_mtu = net->mtu;
7617                 break;
7618         }
7619         /* Need an allowance for the data chunk header too */
7620         goal_mtu -= sizeof(struct sctp_data_chunk);
7621
7622         /* must make even word boundary */
7623         goal_mtu &= 0xfffffffc;
7624         if (asoc->locked_on_sending) {
7625                 /* We are stuck on one stream until the message completes. */
7626                 strq = asoc->locked_on_sending;
7627                 locked = 1;
7628         } else {
7629                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7630                 locked = 0;
7631         }
7632         while ((goal_mtu > 0) && strq) {
7633                 giveup = 0;
7634                 bail = 0;
7635                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7636                     &giveup, eeor_mode, &bail, so_locked);
7637                 if (moved_how_much)
7638                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7639
7640                 if (locked) {
7641                         asoc->locked_on_sending = strq;
7642                         if ((moved_how_much == 0) || (giveup) || bail)
7643                                 /* no more to move for now */
7644                                 break;
7645                 } else {
7646                         asoc->locked_on_sending = NULL;
7647                         if ((giveup) || bail) {
7648                                 break;
7649                         }
7650                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7651                         if (strq == NULL) {
7652                                 break;
7653                         }
7654                 }
7655                 total_moved += moved_how_much;
7656                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7657                 goal_mtu &= 0xfffffffc;
7658         }
7659         if (bail)
7660                 *quit_now = 1;
7661
7662         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7663
7664         if (total_moved == 0) {
7665                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7666                     (net == stcb->asoc.primary_destination)) {
7667                         /* ran dry for primary network net */
7668                         SCTP_STAT_INCR(sctps_primary_randry);
7669                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7670                         /* ran dry with CMT on */
7671                         SCTP_STAT_INCR(sctps_cmt_randry);
7672                 }
7673         }
7674 }
7675
7676 void
7677 sctp_fix_ecn_echo(struct sctp_association *asoc)
7678 {
7679         struct sctp_tmit_chunk *chk;
7680
7681         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7682                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7683                         chk->sent = SCTP_DATAGRAM_UNSENT;
7684                 }
7685         }
7686 }
7687
7688 void
7689 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7690 {
7691         struct sctp_association *asoc;
7692         struct sctp_tmit_chunk *chk;
7693         struct sctp_stream_queue_pending *sp;
7694         unsigned int i;
7695
7696         if (net == NULL) {
7697                 return;
7698         }
7699         asoc = &stcb->asoc;
7700         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7701                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7702                         if (sp->net == net) {
7703                                 sctp_free_remote_addr(sp->net);
7704                                 sp->net = NULL;
7705                         }
7706                 }
7707         }
7708         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7709                 if (chk->whoTo == net) {
7710                         sctp_free_remote_addr(chk->whoTo);
7711                         chk->whoTo = NULL;
7712                 }
7713         }
7714 }
7715
7716 int
7717 sctp_med_chunk_output(struct sctp_inpcb *inp,
7718     struct sctp_tcb *stcb,
7719     struct sctp_association *asoc,
7720     int *num_out,
7721     int *reason_code,
7722     int control_only, int from_where,
7723     struct timeval *now, int *now_filled, int frag_point, int so_locked
7724 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7725     SCTP_UNUSED
7726 #endif
7727 )
7728 {
7729         /*
7730          * Ok this is the generic chunk service queue. we must do the
7731          * following: - Service the stream queue that is next, moving any
7732          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7733          * LAST to the out queue in one pass) and assigning TSN's - Check to
7734          * see if the cwnd/rwnd allows any output, if so we go ahead and
7735          * fomulate and send the low level chunks. Making sure to combine
7736          * any control in the control chunk queue also.
7737          */
7738         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7739         struct mbuf *outchain, *endoutchain;
7740         struct sctp_tmit_chunk *chk, *nchk;
7741
7742         /* temp arrays for unlinking */
7743         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7744         int no_fragmentflg, error;
7745         unsigned int max_rwnd_per_dest, max_send_per_dest;
7746         int one_chunk, hbflag, skip_data_for_this_net;
7747         int asconf, cookie, no_out_cnt;
7748         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7749         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7750         int tsns_sent = 0;
7751         uint32_t auth_offset = 0;
7752         struct sctp_auth_chunk *auth = NULL;
7753         uint16_t auth_keyid;
7754         int override_ok = 1;
7755         int skip_fill_up = 0;
7756         int data_auth_reqd = 0;
7757
7758         /*
7759          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7760          * destination.
7761          */
7762         int quit_now = 0;
7763
7764         *num_out = 0;
7765         auth_keyid = stcb->asoc.authinfo.active_keyid;
7766
7767         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7768             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7769             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7770                 eeor_mode = 1;
7771         } else {
7772                 eeor_mode = 0;
7773         }
7774         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7775         /*
7776          * First lets prime the pump. For each destination, if there is room
7777          * in the flight size, attempt to pull an MTU's worth out of the
7778          * stream queues into the general send_queue
7779          */
7780 #ifdef SCTP_AUDITING_ENABLED
7781         sctp_audit_log(0xC2, 2);
7782 #endif
7783         SCTP_TCB_LOCK_ASSERT(stcb);
7784         hbflag = 0;
7785         if ((control_only) || (asoc->stream_reset_outstanding))
7786                 no_data_chunks = 1;
7787         else
7788                 no_data_chunks = 0;
7789
7790         /* Nothing to possible to send? */
7791         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7792             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7793             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7794             TAILQ_EMPTY(&asoc->send_queue) &&
7795             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7796 nothing_to_send:
7797                 *reason_code = 9;
7798                 return (0);
7799         }
7800         if (asoc->peers_rwnd == 0) {
7801                 /* No room in peers rwnd */
7802                 *reason_code = 1;
7803                 if (asoc->total_flight > 0) {
7804                         /* we are allowed one chunk in flight */
7805                         no_data_chunks = 1;
7806                 }
7807         }
7808         if (stcb->asoc.ecn_echo_cnt_onq) {
7809                 /* Record where a sack goes, if any */
7810                 if (no_data_chunks &&
7811                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7812                         /* Nothing but ECNe to send - we don't do that */
7813                         goto nothing_to_send;
7814                 }
7815                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7816                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7817                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7818                                 sack_goes_to = chk->whoTo;
7819                                 break;
7820                         }
7821                 }
7822         }
7823         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7824         if (stcb->sctp_socket)
7825                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7826         else
7827                 max_send_per_dest = 0;
7828         if (no_data_chunks == 0) {
7829                 /* How many non-directed chunks are there? */
7830                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7831                         if (chk->whoTo == NULL) {
7832                                 /*
7833                                  * We already have non-directed chunks on
7834                                  * the queue, no need to do a fill-up.
7835                                  */
7836                                 skip_fill_up = 1;
7837                                 break;
7838                         }
7839                 }
7840
7841         }
7842         if ((no_data_chunks == 0) &&
7843             (skip_fill_up == 0) &&
7844             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7845                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7846                         /*
7847                          * This for loop we are in takes in each net, if
7848                          * its's got space in cwnd and has data sent to it
7849                          * (when CMT is off) then it calls
7850                          * sctp_fill_outqueue for the net. This gets data on
7851                          * the send queue for that network.
7852                          *
7853                          * In sctp_fill_outqueue TSN's are assigned and data is
7854                          * copied out of the stream buffers. Note mostly
7855                          * copy by reference (we hope).
7856                          */
7857                         net->window_probe = 0;
7858                         if ((net != stcb->asoc.alternate) &&
7859                             ((net->dest_state & SCTP_ADDR_PF) ||
7860                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7861                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7862                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7863                                         sctp_log_cwnd(stcb, net, 1,
7864                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7865                                 }
7866                                 continue;
7867                         }
7868                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7869                             (net->flight_size == 0)) {
7870                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7871                         }
7872                         if (net->flight_size >= net->cwnd) {
7873                                 /* skip this network, no room - can't fill */
7874                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7875                                         sctp_log_cwnd(stcb, net, 3,
7876                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7877                                 }
7878                                 continue;
7879                         }
7880                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7881                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7882                         }
7883                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7884                         if (quit_now) {
7885                                 /* memory alloc failure */
7886                                 no_data_chunks = 1;
7887                                 break;
7888                         }
7889                 }
7890         }
7891         /* now service each destination and send out what we can for it */
7892         /* Nothing to send? */
7893         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7894             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7895             TAILQ_EMPTY(&asoc->send_queue)) {
7896                 *reason_code = 8;
7897                 return (0);
7898         }
7899         if (asoc->sctp_cmt_on_off > 0) {
7900                 /* get the last start point */
7901                 start_at = asoc->last_net_cmt_send_started;
7902                 if (start_at == NULL) {
7903                         /* null so to beginning */
7904                         start_at = TAILQ_FIRST(&asoc->nets);
7905                 } else {
7906                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7907                         if (start_at == NULL) {
7908                                 start_at = TAILQ_FIRST(&asoc->nets);
7909                         }
7910                 }
7911                 asoc->last_net_cmt_send_started = start_at;
7912         } else {
7913                 start_at = TAILQ_FIRST(&asoc->nets);
7914         }
7915         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7916                 if (chk->whoTo == NULL) {
7917                         if (asoc->alternate) {
7918                                 chk->whoTo = asoc->alternate;
7919                         } else {
7920                                 chk->whoTo = asoc->primary_destination;
7921                         }
7922                         atomic_add_int(&chk->whoTo->ref_count, 1);
7923                 }
7924         }
7925         old_start_at = NULL;
7926 again_one_more_time:
7927         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7928                 /* how much can we send? */
7929                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7930                 if (old_start_at && (old_start_at == net)) {
7931                         /* through list ocmpletely. */
7932                         break;
7933                 }
7934                 tsns_sent = 0xa;
7935                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7936                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7937                     (net->flight_size >= net->cwnd)) {
7938                         /*
7939                          * Nothing on control or asconf and flight is full,
7940                          * we can skip even in the CMT case.
7941                          */
7942                         continue;
7943                 }
7944                 bundle_at = 0;
7945                 endoutchain = outchain = NULL;
7946                 no_fragmentflg = 1;
7947                 one_chunk = 0;
7948                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7949                         skip_data_for_this_net = 1;
7950                 } else {
7951                         skip_data_for_this_net = 0;
7952                 }
7953                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7954                         /*
7955                          * if we have a route and an ifp check to see if we
7956                          * have room to send to this guy
7957                          */
7958                         struct ifnet *ifp;
7959
7960                         ifp = net->ro.ro_rt->rt_ifp;
7961                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7962                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7963                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7964                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7965                                 }
7966                                 continue;
7967                         }
7968                 }
7969                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7970 #ifdef INET
7971                 case AF_INET:
7972                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7973                         break;
7974 #endif
7975 #ifdef INET6
7976                 case AF_INET6:
7977                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7978                         break;
7979 #endif
7980                 default:
7981                         /* TSNH */
7982                         mtu = net->mtu;
7983                         break;
7984                 }
7985                 mx_mtu = mtu;
7986                 to_out = 0;
7987                 if (mtu > asoc->peers_rwnd) {
7988                         if (asoc->total_flight > 0) {
7989                                 /* We have a packet in flight somewhere */
7990                                 r_mtu = asoc->peers_rwnd;
7991                         } else {
7992                                 /* We are always allowed to send one MTU out */
7993                                 one_chunk = 1;
7994                                 r_mtu = mtu;
7995                         }
7996                 } else {
7997                         r_mtu = mtu;
7998                 }
7999                 /************************/
8000                 /* ASCONF transmission */
8001                 /************************/
8002                 /* Now first lets go through the asconf queue */
8003                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8004                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8005                                 continue;
8006                         }
8007                         if (chk->whoTo == NULL) {
8008                                 if (asoc->alternate == NULL) {
8009                                         if (asoc->primary_destination != net) {
8010                                                 break;
8011                                         }
8012                                 } else {
8013                                         if (asoc->alternate != net) {
8014                                                 break;
8015                                         }
8016                                 }
8017                         } else {
8018                                 if (chk->whoTo != net) {
8019                                         break;
8020                                 }
8021                         }
8022                         if (chk->data == NULL) {
8023                                 break;
8024                         }
8025                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8026                             chk->sent != SCTP_DATAGRAM_RESEND) {
8027                                 break;
8028                         }
8029                         /*
8030                          * if no AUTH is yet included and this chunk
8031                          * requires it, make sure to account for it.  We
8032                          * don't apply the size until the AUTH chunk is
8033                          * actually added below in case there is no room for
8034                          * this chunk. NOTE: we overload the use of "omtu"
8035                          * here
8036                          */
8037                         if ((auth == NULL) &&
8038                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8039                             stcb->asoc.peer_auth_chunks)) {
8040                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8041                         } else
8042                                 omtu = 0;
8043                         /* Here we do NOT factor the r_mtu */
8044                         if ((chk->send_size < (int)(mtu - omtu)) ||
8045                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8046                                 /*
8047                                  * We probably should glom the mbuf chain
8048                                  * from the chk->data for control but the
8049                                  * problem is it becomes yet one more level
8050                                  * of tracking to do if for some reason
8051                                  * output fails. Then I have got to
8052                                  * reconstruct the merged control chain.. el
8053                                  * yucko.. for now we take the easy way and
8054                                  * do the copy
8055                                  */
8056                                 /*
8057                                  * Add an AUTH chunk, if chunk requires it
8058                                  * save the offset into the chain for AUTH
8059                                  */
8060                                 if ((auth == NULL) &&
8061                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8062                                     stcb->asoc.peer_auth_chunks))) {
8063                                         outchain = sctp_add_auth_chunk(outchain,
8064                                             &endoutchain,
8065                                             &auth,
8066                                             &auth_offset,
8067                                             stcb,
8068                                             chk->rec.chunk_id.id);
8069                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8070                                 }
8071                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8072                                     (int)chk->rec.chunk_id.can_take_data,
8073                                     chk->send_size, chk->copy_by_ref);
8074                                 if (outchain == NULL) {
8075                                         *reason_code = 8;
8076                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8077                                         return (ENOMEM);
8078                                 }
8079                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8080                                 /* update our MTU size */
8081                                 if (mtu > (chk->send_size + omtu))
8082                                         mtu -= (chk->send_size + omtu);
8083                                 else
8084                                         mtu = 0;
8085                                 to_out += (chk->send_size + omtu);
8086                                 /* Do clear IP_DF ? */
8087                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8088                                         no_fragmentflg = 0;
8089                                 }
8090                                 if (chk->rec.chunk_id.can_take_data)
8091                                         chk->data = NULL;
8092                                 /*
8093                                  * set hb flag since we can use these for
8094                                  * RTO
8095                                  */
8096                                 hbflag = 1;
8097                                 asconf = 1;
8098                                 /*
8099                                  * should sysctl this: don't bundle data
8100                                  * with ASCONF since it requires AUTH
8101                                  */
8102                                 no_data_chunks = 1;
8103                                 chk->sent = SCTP_DATAGRAM_SENT;
8104                                 if (chk->whoTo == NULL) {
8105                                         chk->whoTo = net;
8106                                         atomic_add_int(&net->ref_count, 1);
8107                                 }
8108                                 chk->snd_count++;
8109                                 if (mtu == 0) {
8110                                         /*
8111                                          * Ok we are out of room but we can
8112                                          * output without effecting the
8113                                          * flight size since this little guy
8114                                          * is a control only packet.
8115                                          */
8116                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8117                                         /*
8118                                          * do NOT clear the asconf flag as
8119                                          * it is used to do appropriate
8120                                          * source address selection.
8121                                          */
8122                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8123                                             (struct sockaddr *)&net->ro._l_addr,
8124                                             outchain, auth_offset, auth,
8125                                             stcb->asoc.authinfo.active_keyid,
8126                                             no_fragmentflg, 0, asconf,
8127                                             inp->sctp_lport, stcb->rport,
8128                                             htonl(stcb->asoc.peer_vtag),
8129                                             net->port, NULL,
8130                                             0, 0,
8131                                             so_locked))) {
8132                                                 if (error == ENOBUFS) {
8133                                                         asoc->ifp_had_enobuf = 1;
8134                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8135                                                 }
8136                                                 if (from_where == 0) {
8137                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8138                                                 }
8139                                                 if (*now_filled == 0) {
8140                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8141                                                         *now_filled = 1;
8142                                                         *now = net->last_sent_time;
8143                                                 } else {
8144                                                         net->last_sent_time = *now;
8145                                                 }
8146                                                 hbflag = 0;
8147                                                 /* error, could not output */
8148                                                 if (error == EHOSTUNREACH) {
8149                                                         /*
8150                                                          * Destination went
8151                                                          * unreachable
8152                                                          * during this send
8153                                                          */
8154                                                         sctp_move_chunks_from_net(stcb, net);
8155                                                 }
8156                                                 *reason_code = 7;
8157                                                 continue;
8158                                         } else
8159                                                 asoc->ifp_had_enobuf = 0;
8160                                         if (*now_filled == 0) {
8161                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8162                                                 *now_filled = 1;
8163                                                 *now = net->last_sent_time;
8164                                         } else {
8165                                                 net->last_sent_time = *now;
8166                                         }
8167                                         hbflag = 0;
8168                                         /*
8169                                          * increase the number we sent, if a
8170                                          * cookie is sent we don't tell them
8171                                          * any was sent out.
8172                                          */
8173                                         outchain = endoutchain = NULL;
8174                                         auth = NULL;
8175                                         auth_offset = 0;
8176                                         if (!no_out_cnt)
8177                                                 *num_out += ctl_cnt;
8178                                         /* recalc a clean slate and setup */
8179                                         switch (net->ro._l_addr.sa.sa_family) {
8180 #ifdef INET
8181                                         case AF_INET:
8182                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8183                                                 break;
8184 #endif
8185 #ifdef INET6
8186                                         case AF_INET6:
8187                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8188                                                 break;
8189 #endif
8190                                         default:
8191                                                 /* TSNH */
8192                                                 mtu = net->mtu;
8193                                                 break;
8194                                         }
8195                                         to_out = 0;
8196                                         no_fragmentflg = 1;
8197                                 }
8198                         }
8199                 }
8200                 /************************/
8201                 /* Control transmission */
8202                 /************************/
8203                 /* Now first lets go through the control queue */
8204                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8205                         if ((sack_goes_to) &&
8206                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8207                             (chk->whoTo != sack_goes_to)) {
8208                                 /*
8209                                  * if we have a sack in queue, and we are
8210                                  * looking at an ecn echo that is NOT queued
8211                                  * to where the sack is going..
8212                                  */
8213                                 if (chk->whoTo == net) {
8214                                         /*
8215                                          * Don't transmit it to where its
8216                                          * going (current net)
8217                                          */
8218                                         continue;
8219                                 } else if (sack_goes_to == net) {
8220                                         /*
8221                                          * But do transmit it to this
8222                                          * address
8223                                          */
8224                                         goto skip_net_check;
8225                                 }
8226                         }
8227                         if (chk->whoTo == NULL) {
8228                                 if (asoc->alternate == NULL) {
8229                                         if (asoc->primary_destination != net) {
8230                                                 continue;
8231                                         }
8232                                 } else {
8233                                         if (asoc->alternate != net) {
8234                                                 continue;
8235                                         }
8236                                 }
8237                         } else {
8238                                 if (chk->whoTo != net) {
8239                                         continue;
8240                                 }
8241                         }
8242         skip_net_check:
8243                         if (chk->data == NULL) {
8244                                 continue;
8245                         }
8246                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8247                                 /*
8248                                  * It must be unsent. Cookies and ASCONF's
8249                                  * hang around but there timers will force
8250                                  * when marked for resend.
8251                                  */
8252                                 continue;
8253                         }
8254                         /*
8255                          * if no AUTH is yet included and this chunk
8256                          * requires it, make sure to account for it.  We
8257                          * don't apply the size until the AUTH chunk is
8258                          * actually added below in case there is no room for
8259                          * this chunk. NOTE: we overload the use of "omtu"
8260                          * here
8261                          */
8262                         if ((auth == NULL) &&
8263                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8264                             stcb->asoc.peer_auth_chunks)) {
8265                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8266                         } else
8267                                 omtu = 0;
8268                         /* Here we do NOT factor the r_mtu */
8269                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8270                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8271                                 /*
8272                                  * We probably should glom the mbuf chain
8273                                  * from the chk->data for control but the
8274                                  * problem is it becomes yet one more level
8275                                  * of tracking to do if for some reason
8276                                  * output fails. Then I have got to
8277                                  * reconstruct the merged control chain.. el
8278                                  * yucko.. for now we take the easy way and
8279                                  * do the copy
8280                                  */
8281                                 /*
8282                                  * Add an AUTH chunk, if chunk requires it
8283                                  * save the offset into the chain for AUTH
8284                                  */
8285                                 if ((auth == NULL) &&
8286                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8287                                     stcb->asoc.peer_auth_chunks))) {
8288                                         outchain = sctp_add_auth_chunk(outchain,
8289                                             &endoutchain,
8290                                             &auth,
8291                                             &auth_offset,
8292                                             stcb,
8293                                             chk->rec.chunk_id.id);
8294                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8295                                 }
8296                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8297                                     (int)chk->rec.chunk_id.can_take_data,
8298                                     chk->send_size, chk->copy_by_ref);
8299                                 if (outchain == NULL) {
8300                                         *reason_code = 8;
8301                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8302                                         return (ENOMEM);
8303                                 }
8304                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8305                                 /* update our MTU size */
8306                                 if (mtu > (chk->send_size + omtu))
8307                                         mtu -= (chk->send_size + omtu);
8308                                 else
8309                                         mtu = 0;
8310                                 to_out += (chk->send_size + omtu);
8311                                 /* Do clear IP_DF ? */
8312                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8313                                         no_fragmentflg = 0;
8314                                 }
8315                                 if (chk->rec.chunk_id.can_take_data)
8316                                         chk->data = NULL;
8317                                 /* Mark things to be removed, if needed */
8318                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8319                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8320                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8321                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8322                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8323                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8324                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8325                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8326                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8327                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8328                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8329                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8330                                                 hbflag = 1;
8331                                         }
8332                                         /* remove these chunks at the end */
8333                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8334                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8335                                                 /* turn off the timer */
8336                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8337                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8338                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8339                                                 }
8340                                         }
8341                                         ctl_cnt++;
8342                                 } else {
8343                                         /*
8344                                          * Other chunks, since they have
8345                                          * timers running (i.e. COOKIE) we
8346                                          * just "trust" that it gets sent or
8347                                          * retransmitted.
8348                                          */
8349                                         ctl_cnt++;
8350                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8351                                                 cookie = 1;
8352                                                 no_out_cnt = 1;
8353                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8354                                                 /*
8355                                                  * Increment ecne send count
8356                                                  * here this means we may be
8357                                                  * over-zealous in our
8358                                                  * counting if the send
8359                                                  * fails, but its the best
8360                                                  * place to do it (we used
8361                                                  * to do it in the queue of
8362                                                  * the chunk, but that did
8363                                                  * not tell how many times
8364                                                  * it was sent.
8365                                                  */
8366                                                 SCTP_STAT_INCR(sctps_sendecne);
8367                                         }
8368                                         chk->sent = SCTP_DATAGRAM_SENT;
8369                                         if (chk->whoTo == NULL) {
8370                                                 chk->whoTo = net;
8371                                                 atomic_add_int(&net->ref_count, 1);
8372                                         }
8373                                         chk->snd_count++;
8374                                 }
8375                                 if (mtu == 0) {
8376                                         /*
8377                                          * Ok we are out of room but we can
8378                                          * output without effecting the
8379                                          * flight size since this little guy
8380                                          * is a control only packet.
8381                                          */
8382                                         if (asconf) {
8383                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8384                                                 /*
8385                                                  * do NOT clear the asconf
8386                                                  * flag as it is used to do
8387                                                  * appropriate source
8388                                                  * address selection.
8389                                                  */
8390                                         }
8391                                         if (cookie) {
8392                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8393                                                 cookie = 0;
8394                                         }
8395                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8396                                             (struct sockaddr *)&net->ro._l_addr,
8397                                             outchain,
8398                                             auth_offset, auth,
8399                                             stcb->asoc.authinfo.active_keyid,
8400                                             no_fragmentflg, 0, asconf,
8401                                             inp->sctp_lport, stcb->rport,
8402                                             htonl(stcb->asoc.peer_vtag),
8403                                             net->port, NULL,
8404                                             0, 0,
8405                                             so_locked))) {
8406                                                 if (error == ENOBUFS) {
8407                                                         asoc->ifp_had_enobuf = 1;
8408                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8409                                                 }
8410                                                 if (from_where == 0) {
8411                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8412                                                 }
8413                                                 /* error, could not output */
8414                                                 if (hbflag) {
8415                                                         if (*now_filled == 0) {
8416                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8417                                                                 *now_filled = 1;
8418                                                                 *now = net->last_sent_time;
8419                                                         } else {
8420                                                                 net->last_sent_time = *now;
8421                                                         }
8422                                                         hbflag = 0;
8423                                                 }
8424                                                 if (error == EHOSTUNREACH) {
8425                                                         /*
8426                                                          * Destination went
8427                                                          * unreachable
8428                                                          * during this send
8429                                                          */
8430                                                         sctp_move_chunks_from_net(stcb, net);
8431                                                 }
8432                                                 *reason_code = 7;
8433                                                 continue;
8434                                         } else
8435                                                 asoc->ifp_had_enobuf = 0;
8436                                         /* Only HB or ASCONF advances time */
8437                                         if (hbflag) {
8438                                                 if (*now_filled == 0) {
8439                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8440                                                         *now_filled = 1;
8441                                                         *now = net->last_sent_time;
8442                                                 } else {
8443                                                         net->last_sent_time = *now;
8444                                                 }
8445                                                 hbflag = 0;
8446                                         }
8447                                         /*
8448                                          * increase the number we sent, if a
8449                                          * cookie is sent we don't tell them
8450                                          * any was sent out.
8451                                          */
8452                                         outchain = endoutchain = NULL;
8453                                         auth = NULL;
8454                                         auth_offset = 0;
8455                                         if (!no_out_cnt)
8456                                                 *num_out += ctl_cnt;
8457                                         /* recalc a clean slate and setup */
8458                                         switch (net->ro._l_addr.sa.sa_family) {
8459 #ifdef INET
8460                                         case AF_INET:
8461                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8462                                                 break;
8463 #endif
8464 #ifdef INET6
8465                                         case AF_INET6:
8466                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8467                                                 break;
8468 #endif
8469                                         default:
8470                                                 /* TSNH */
8471                                                 mtu = net->mtu;
8472                                                 break;
8473                                         }
8474                                         to_out = 0;
8475                                         no_fragmentflg = 1;
8476                                 }
8477                         }
8478                 }
8479                 /* JRI: if dest is in PF state, do not send data to it */
8480                 if ((asoc->sctp_cmt_on_off > 0) &&
8481                     (net != stcb->asoc.alternate) &&
8482                     (net->dest_state & SCTP_ADDR_PF)) {
8483                         goto no_data_fill;
8484                 }
8485                 if (net->flight_size >= net->cwnd) {
8486                         goto no_data_fill;
8487                 }
8488                 if ((asoc->sctp_cmt_on_off > 0) &&
8489                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8490                     (net->flight_size > max_rwnd_per_dest)) {
8491                         goto no_data_fill;
8492                 }
8493                 /*
8494                  * We need a specific accounting for the usage of the send
8495                  * buffer. We also need to check the number of messages per
8496                  * net. For now, this is better than nothing and it disabled
8497                  * by default...
8498                  */
8499                 if ((asoc->sctp_cmt_on_off > 0) &&
8500                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8501                     (max_send_per_dest > 0) &&
8502                     (net->flight_size > max_send_per_dest)) {
8503                         goto no_data_fill;
8504                 }
8505                 /*********************/
8506                 /* Data transmission */
8507                 /*********************/
8508                 /*
8509                  * if AUTH for DATA is required and no AUTH has been added
8510                  * yet, account for this in the mtu now... if no data can be
8511                  * bundled, this adjustment won't matter anyways since the
8512                  * packet will be going out...
8513                  */
8514                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8515                     stcb->asoc.peer_auth_chunks);
8516                 if (data_auth_reqd && (auth == NULL)) {
8517                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8518                 }
8519                 /* now lets add any data within the MTU constraints */
8520                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8521                 case AF_INET:
8522                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8523                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8524                         else
8525                                 omtu = 0;
8526                         break;
8527 #ifdef INET6
8528                 case AF_INET6:
8529                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8530                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8531                         else
8532                                 omtu = 0;
8533                         break;
8534 #endif
8535                 default:
8536                         /* TSNH */
8537                         omtu = 0;
8538                         break;
8539                 }
8540                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8541                     (skip_data_for_this_net == 0)) ||
8542                     (cookie)) {
8543                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8544                                 if (no_data_chunks) {
8545                                         /* let only control go out */
8546                                         *reason_code = 1;
8547                                         break;
8548                                 }
8549                                 if (net->flight_size >= net->cwnd) {
8550                                         /* skip this net, no room for data */
8551                                         *reason_code = 2;
8552                                         break;
8553                                 }
8554                                 if ((chk->whoTo != NULL) &&
8555                                     (chk->whoTo != net)) {
8556                                         /* Don't send the chunk on this net */
8557                                         continue;
8558                                 }
8559                                 if (asoc->sctp_cmt_on_off == 0) {
8560                                         if ((asoc->alternate) &&
8561                                             (asoc->alternate != net) &&
8562                                             (chk->whoTo == NULL)) {
8563                                                 continue;
8564                                         } else if ((net != asoc->primary_destination) &&
8565                                                     (asoc->alternate == NULL) &&
8566                                             (chk->whoTo == NULL)) {
8567                                                 continue;
8568                                         }
8569                                 }
8570                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8571                                         /*-
8572                                          * strange, we have a chunk that is
8573                                          * to big for its destination and
8574                                          * yet no fragment ok flag.
8575                                          * Something went wrong when the
8576                                          * PMTU changed...we did not mark
8577                                          * this chunk for some reason?? I
8578                                          * will fix it here by letting IP
8579                                          * fragment it for now and printing
8580                                          * a warning. This really should not
8581                                          * happen ...
8582                                          */
8583                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8584                                             chk->send_size, mtu);
8585                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8586                                 }
8587                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8588                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8589                                         struct sctp_data_chunk *dchkh;
8590
8591                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8592                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8593                                 }
8594                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8595                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8596                                         /* ok we will add this one */
8597
8598                                         /*
8599                                          * Add an AUTH chunk, if chunk
8600                                          * requires it, save the offset into
8601                                          * the chain for AUTH
8602                                          */
8603                                         if (data_auth_reqd) {
8604                                                 if (auth == NULL) {
8605                                                         outchain = sctp_add_auth_chunk(outchain,
8606                                                             &endoutchain,
8607                                                             &auth,
8608                                                             &auth_offset,
8609                                                             stcb,
8610                                                             SCTP_DATA);
8611                                                         auth_keyid = chk->auth_keyid;
8612                                                         override_ok = 0;
8613                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8614                                                 } else if (override_ok) {
8615                                                         /*
8616                                                          * use this data's
8617                                                          * keyid
8618                                                          */
8619                                                         auth_keyid = chk->auth_keyid;
8620                                                         override_ok = 0;
8621                                                 } else if (auth_keyid != chk->auth_keyid) {
8622                                                         /*
8623                                                          * different keyid,
8624                                                          * so done bundling
8625                                                          */
8626                                                         break;
8627                                                 }
8628                                         }
8629                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8630                                             chk->send_size, chk->copy_by_ref);
8631                                         if (outchain == NULL) {
8632                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8633                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8634                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8635                                                 }
8636                                                 *reason_code = 3;
8637                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8638                                                 return (ENOMEM);
8639                                         }
8640                                         /* upate our MTU size */
8641                                         /* Do clear IP_DF ? */
8642                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8643                                                 no_fragmentflg = 0;
8644                                         }
8645                                         /* unsigned subtraction of mtu */
8646                                         if (mtu > chk->send_size)
8647                                                 mtu -= chk->send_size;
8648                                         else
8649                                                 mtu = 0;
8650                                         /* unsigned subtraction of r_mtu */
8651                                         if (r_mtu > chk->send_size)
8652                                                 r_mtu -= chk->send_size;
8653                                         else
8654                                                 r_mtu = 0;
8655
8656                                         to_out += chk->send_size;
8657                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8658 #ifdef INVARIANTS
8659                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8660 #else
8661                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8662                                                     mx_mtu, to_out);
8663 #endif
8664                                         }
8665                                         chk->window_probe = 0;
8666                                         data_list[bundle_at++] = chk;
8667                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8668                                                 break;
8669                                         }
8670                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8671                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8672                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8673                                                 } else {
8674                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8675                                                 }
8676                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8677                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8678                                                         /*
8679                                                          * Count number of
8680                                                          * user msg's that
8681                                                          * were fragmented
8682                                                          * we do this by
8683                                                          * counting when we
8684                                                          * see a LAST
8685                                                          * fragment only.
8686                                                          */
8687                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8688                                         }
8689                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8690                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8691                                                         data_list[0]->window_probe = 1;
8692                                                         net->window_probe = 1;
8693                                                 }
8694                                                 break;
8695                                         }
8696                                 } else {
8697                                         /*
8698                                          * Must be sent in order of the
8699                                          * TSN's (on a network)
8700                                          */
8701                                         break;
8702                                 }
8703                         }       /* for (chunk gather loop for this net) */
8704                 }               /* if asoc.state OPEN */
8705 no_data_fill:
8706                 /* Is there something to send for this destination? */
8707                 if (outchain) {
8708                         /* We may need to start a control timer or two */
8709                         if (asconf) {
8710                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8711                                     stcb, net);
8712                                 /*
8713                                  * do NOT clear the asconf flag as it is
8714                                  * used to do appropriate source address
8715                                  * selection.
8716                                  */
8717                         }
8718                         if (cookie) {
8719                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8720                                 cookie = 0;
8721                         }
8722                         /* must start a send timer if data is being sent */
8723                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8724                                 /*
8725                                  * no timer running on this destination
8726                                  * restart it.
8727                                  */
8728                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8729                         }
8730                         /* Now send it, if there is anything to send :> */
8731                         if ((error = sctp_lowlevel_chunk_output(inp,
8732                             stcb,
8733                             net,
8734                             (struct sockaddr *)&net->ro._l_addr,
8735                             outchain,
8736                             auth_offset,
8737                             auth,
8738                             auth_keyid,
8739                             no_fragmentflg,
8740                             bundle_at,
8741                             asconf,
8742                             inp->sctp_lport, stcb->rport,
8743                             htonl(stcb->asoc.peer_vtag),
8744                             net->port, NULL,
8745                             0, 0,
8746                             so_locked))) {
8747                                 /* error, we could not output */
8748                                 if (error == ENOBUFS) {
8749                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8750                                         asoc->ifp_had_enobuf = 1;
8751                                 }
8752                                 if (from_where == 0) {
8753                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8754                                 }
8755                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8756                                 if (hbflag) {
8757                                         if (*now_filled == 0) {
8758                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8759                                                 *now_filled = 1;
8760                                                 *now = net->last_sent_time;
8761                                         } else {
8762                                                 net->last_sent_time = *now;
8763                                         }
8764                                         hbflag = 0;
8765                                 }
8766                                 if (error == EHOSTUNREACH) {
8767                                         /*
8768                                          * Destination went unreachable
8769                                          * during this send
8770                                          */
8771                                         sctp_move_chunks_from_net(stcb, net);
8772                                 }
8773                                 *reason_code = 6;
8774                                 /*-
8775                                  * I add this line to be paranoid. As far as
8776                                  * I can tell the continue, takes us back to
8777                                  * the top of the for, but just to make sure
8778                                  * I will reset these again here.
8779                                  */
8780                                 ctl_cnt = bundle_at = 0;
8781                                 continue;       /* This takes us back to the
8782                                                  * for() for the nets. */
8783                         } else {
8784                                 asoc->ifp_had_enobuf = 0;
8785                         }
8786                         endoutchain = NULL;
8787                         auth = NULL;
8788                         auth_offset = 0;
8789                         if (bundle_at || hbflag) {
8790                                 /* For data/asconf and hb set time */
8791                                 if (*now_filled == 0) {
8792                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8793                                         *now_filled = 1;
8794                                         *now = net->last_sent_time;
8795                                 } else {
8796                                         net->last_sent_time = *now;
8797                                 }
8798                         }
8799                         if (!no_out_cnt) {
8800                                 *num_out += (ctl_cnt + bundle_at);
8801                         }
8802                         if (bundle_at) {
8803                                 /* setup for a RTO measurement */
8804                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8805                                 /* fill time if not already filled */
8806                                 if (*now_filled == 0) {
8807                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8808                                         *now_filled = 1;
8809                                         *now = asoc->time_last_sent;
8810                                 } else {
8811                                         asoc->time_last_sent = *now;
8812                                 }
8813                                 if (net->rto_needed) {
8814                                         data_list[0]->do_rtt = 1;
8815                                         net->rto_needed = 0;
8816                                 }
8817                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8818                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8819                         }
8820                         if (one_chunk) {
8821                                 break;
8822                         }
8823                 }
8824                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8825                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8826                 }
8827         }
8828         if (old_start_at == NULL) {
8829                 old_start_at = start_at;
8830                 start_at = TAILQ_FIRST(&asoc->nets);
8831                 if (old_start_at)
8832                         goto again_one_more_time;
8833         }
8834         /*
8835          * At the end there should be no NON timed chunks hanging on this
8836          * queue.
8837          */
8838         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8839                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8840         }
8841         if ((*num_out == 0) && (*reason_code == 0)) {
8842                 *reason_code = 4;
8843         } else {
8844                 *reason_code = 5;
8845         }
8846         sctp_clean_up_ctl(stcb, asoc, so_locked);
8847         return (0);
8848 }
8849
8850 void
8851 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8852 {
8853         /*-
8854          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8855          * the control chunk queue.
8856          */
8857         struct sctp_chunkhdr *hdr;
8858         struct sctp_tmit_chunk *chk;
8859         struct mbuf *mat;
8860
8861         SCTP_TCB_LOCK_ASSERT(stcb);
8862         sctp_alloc_a_chunk(stcb, chk);
8863         if (chk == NULL) {
8864                 /* no memory */
8865                 sctp_m_freem(op_err);
8866                 return;
8867         }
8868         chk->copy_by_ref = 0;
8869         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8870         if (op_err == NULL) {
8871                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8872                 return;
8873         }
8874         chk->send_size = 0;
8875         mat = op_err;
8876         while (mat != NULL) {
8877                 chk->send_size += SCTP_BUF_LEN(mat);
8878                 mat = SCTP_BUF_NEXT(mat);
8879         }
8880         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8881         chk->rec.chunk_id.can_take_data = 1;
8882         chk->sent = SCTP_DATAGRAM_UNSENT;
8883         chk->snd_count = 0;
8884         chk->flags = 0;
8885         chk->asoc = &stcb->asoc;
8886         chk->data = op_err;
8887         chk->whoTo = NULL;
8888         hdr = mtod(op_err, struct sctp_chunkhdr *);
8889         hdr->chunk_type = SCTP_OPERATION_ERROR;
8890         hdr->chunk_flags = 0;
8891         hdr->chunk_length = htons(chk->send_size);
8892         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8893             chk,
8894             sctp_next);
8895         chk->asoc->ctrl_queue_cnt++;
8896 }
8897
8898 int
8899 sctp_send_cookie_echo(struct mbuf *m,
8900     int offset,
8901     struct sctp_tcb *stcb,
8902     struct sctp_nets *net)
8903 {
8904         /*-
8905          * pull out the cookie and put it at the front of the control chunk
8906          * queue.
8907          */
8908         int at;
8909         struct mbuf *cookie;
8910         struct sctp_paramhdr parm, *phdr;
8911         struct sctp_chunkhdr *hdr;
8912         struct sctp_tmit_chunk *chk;
8913         uint16_t ptype, plen;
8914
8915         /* First find the cookie in the param area */
8916         cookie = NULL;
8917         at = offset + sizeof(struct sctp_init_chunk);
8918
8919         SCTP_TCB_LOCK_ASSERT(stcb);
8920         do {
8921                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8922                 if (phdr == NULL) {
8923                         return (-3);
8924                 }
8925                 ptype = ntohs(phdr->param_type);
8926                 plen = ntohs(phdr->param_length);
8927                 if (ptype == SCTP_STATE_COOKIE) {
8928                         int pad;
8929
8930                         /* found the cookie */
8931                         if ((pad = (plen % 4))) {
8932                                 plen += 4 - pad;
8933                         }
8934                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8935                         if (cookie == NULL) {
8936                                 /* No memory */
8937                                 return (-2);
8938                         }
8939 #ifdef SCTP_MBUF_LOGGING
8940                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8941                                 struct mbuf *mat;
8942
8943                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8944                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8945                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8946                                         }
8947                                 }
8948                         }
8949 #endif
8950                         break;
8951                 }
8952                 at += SCTP_SIZE32(plen);
8953         } while (phdr);
8954         if (cookie == NULL) {
8955                 /* Did not find the cookie */
8956                 return (-3);
8957         }
8958         /* ok, we got the cookie lets change it into a cookie echo chunk */
8959
8960         /* first the change from param to cookie */
8961         hdr = mtod(cookie, struct sctp_chunkhdr *);
8962         hdr->chunk_type = SCTP_COOKIE_ECHO;
8963         hdr->chunk_flags = 0;
8964         /* get the chunk stuff now and place it in the FRONT of the queue */
8965         sctp_alloc_a_chunk(stcb, chk);
8966         if (chk == NULL) {
8967                 /* no memory */
8968                 sctp_m_freem(cookie);
8969                 return (-5);
8970         }
8971         chk->copy_by_ref = 0;
8972         chk->send_size = plen;
8973         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8974         chk->rec.chunk_id.can_take_data = 0;
8975         chk->sent = SCTP_DATAGRAM_UNSENT;
8976         chk->snd_count = 0;
8977         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8978         chk->asoc = &stcb->asoc;
8979         chk->data = cookie;
8980         chk->whoTo = net;
8981         atomic_add_int(&chk->whoTo->ref_count, 1);
8982         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8983         chk->asoc->ctrl_queue_cnt++;
8984         return (0);
8985 }
8986
8987 void
8988 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8989     struct mbuf *m,
8990     int offset,
8991     int chk_length,
8992     struct sctp_nets *net)
8993 {
8994         /*
8995          * take a HB request and make it into a HB ack and send it.
8996          */
8997         struct mbuf *outchain;
8998         struct sctp_chunkhdr *chdr;
8999         struct sctp_tmit_chunk *chk;
9000
9001
9002         if (net == NULL)
9003                 /* must have a net pointer */
9004                 return;
9005
9006         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
9007         if (outchain == NULL) {
9008                 /* gak out of memory */
9009                 return;
9010         }
9011 #ifdef SCTP_MBUF_LOGGING
9012         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9013                 struct mbuf *mat;
9014
9015                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9016                         if (SCTP_BUF_IS_EXTENDED(mat)) {
9017                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9018                         }
9019                 }
9020         }
9021 #endif
9022         chdr = mtod(outchain, struct sctp_chunkhdr *);
9023         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9024         chdr->chunk_flags = 0;
9025         if (chk_length % 4) {
9026                 /* need pad */
9027                 uint32_t cpthis = 0;
9028                 int padlen;
9029
9030                 padlen = 4 - (chk_length % 4);
9031                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9032         }
9033         sctp_alloc_a_chunk(stcb, chk);
9034         if (chk == NULL) {
9035                 /* no memory */
9036                 sctp_m_freem(outchain);
9037                 return;
9038         }
9039         chk->copy_by_ref = 0;
9040         chk->send_size = chk_length;
9041         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9042         chk->rec.chunk_id.can_take_data = 1;
9043         chk->sent = SCTP_DATAGRAM_UNSENT;
9044         chk->snd_count = 0;
9045         chk->flags = 0;
9046         chk->asoc = &stcb->asoc;
9047         chk->data = outchain;
9048         chk->whoTo = net;
9049         atomic_add_int(&chk->whoTo->ref_count, 1);
9050         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9051         chk->asoc->ctrl_queue_cnt++;
9052 }
9053
9054 void
9055 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9056 {
9057         /* formulate and queue a cookie-ack back to sender */
9058         struct mbuf *cookie_ack;
9059         struct sctp_chunkhdr *hdr;
9060         struct sctp_tmit_chunk *chk;
9061
9062         cookie_ack = NULL;
9063         SCTP_TCB_LOCK_ASSERT(stcb);
9064
9065         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9066         if (cookie_ack == NULL) {
9067                 /* no mbuf's */
9068                 return;
9069         }
9070         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9071         sctp_alloc_a_chunk(stcb, chk);
9072         if (chk == NULL) {
9073                 /* no memory */
9074                 sctp_m_freem(cookie_ack);
9075                 return;
9076         }
9077         chk->copy_by_ref = 0;
9078         chk->send_size = sizeof(struct sctp_chunkhdr);
9079         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9080         chk->rec.chunk_id.can_take_data = 1;
9081         chk->sent = SCTP_DATAGRAM_UNSENT;
9082         chk->snd_count = 0;
9083         chk->flags = 0;
9084         chk->asoc = &stcb->asoc;
9085         chk->data = cookie_ack;
9086         if (chk->asoc->last_control_chunk_from != NULL) {
9087                 chk->whoTo = chk->asoc->last_control_chunk_from;
9088                 atomic_add_int(&chk->whoTo->ref_count, 1);
9089         } else {
9090                 chk->whoTo = NULL;
9091         }
9092         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9093         hdr->chunk_type = SCTP_COOKIE_ACK;
9094         hdr->chunk_flags = 0;
9095         hdr->chunk_length = htons(chk->send_size);
9096         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9097         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9098         chk->asoc->ctrl_queue_cnt++;
9099         return;
9100 }
9101
9102
9103 void
9104 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9105 {
9106         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9107         struct mbuf *m_shutdown_ack;
9108         struct sctp_shutdown_ack_chunk *ack_cp;
9109         struct sctp_tmit_chunk *chk;
9110
9111         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9112         if (m_shutdown_ack == NULL) {
9113                 /* no mbuf's */
9114                 return;
9115         }
9116         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9117         sctp_alloc_a_chunk(stcb, chk);
9118         if (chk == NULL) {
9119                 /* no memory */
9120                 sctp_m_freem(m_shutdown_ack);
9121                 return;
9122         }
9123         chk->copy_by_ref = 0;
9124         chk->send_size = sizeof(struct sctp_chunkhdr);
9125         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9126         chk->rec.chunk_id.can_take_data = 1;
9127         chk->sent = SCTP_DATAGRAM_UNSENT;
9128         chk->snd_count = 0;
9129         chk->flags = 0;
9130         chk->asoc = &stcb->asoc;
9131         chk->data = m_shutdown_ack;
9132         chk->whoTo = net;
9133         if (chk->whoTo) {
9134                 atomic_add_int(&chk->whoTo->ref_count, 1);
9135         }
9136         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9137         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9138         ack_cp->ch.chunk_flags = 0;
9139         ack_cp->ch.chunk_length = htons(chk->send_size);
9140         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9141         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9142         chk->asoc->ctrl_queue_cnt++;
9143         return;
9144 }
9145
9146 void
9147 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9148 {
9149         /* formulate and queue a SHUTDOWN to the sender */
9150         struct mbuf *m_shutdown;
9151         struct sctp_shutdown_chunk *shutdown_cp;
9152         struct sctp_tmit_chunk *chk;
9153
9154         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9155         if (m_shutdown == NULL) {
9156                 /* no mbuf's */
9157                 return;
9158         }
9159         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9160         sctp_alloc_a_chunk(stcb, chk);
9161         if (chk == NULL) {
9162                 /* no memory */
9163                 sctp_m_freem(m_shutdown);
9164                 return;
9165         }
9166         chk->copy_by_ref = 0;
9167         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9168         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9169         chk->rec.chunk_id.can_take_data = 1;
9170         chk->sent = SCTP_DATAGRAM_UNSENT;
9171         chk->snd_count = 0;
9172         chk->flags = 0;
9173         chk->asoc = &stcb->asoc;
9174         chk->data = m_shutdown;
9175         chk->whoTo = net;
9176         if (chk->whoTo) {
9177                 atomic_add_int(&chk->whoTo->ref_count, 1);
9178         }
9179         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9180         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9181         shutdown_cp->ch.chunk_flags = 0;
9182         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9183         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9184         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9185         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9186         chk->asoc->ctrl_queue_cnt++;
9187         return;
9188 }
9189
9190 void
9191 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9192 {
9193         /*
9194          * formulate and queue an ASCONF to the peer. ASCONF parameters
9195          * should be queued on the assoc queue.
9196          */
9197         struct sctp_tmit_chunk *chk;
9198         struct mbuf *m_asconf;
9199         int len;
9200
9201         SCTP_TCB_LOCK_ASSERT(stcb);
9202
9203         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9204             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9205                 /* can't send a new one if there is one in flight already */
9206                 return;
9207         }
9208         /* compose an ASCONF chunk, maximum length is PMTU */
9209         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9210         if (m_asconf == NULL) {
9211                 return;
9212         }
9213         sctp_alloc_a_chunk(stcb, chk);
9214         if (chk == NULL) {
9215                 /* no memory */
9216                 sctp_m_freem(m_asconf);
9217                 return;
9218         }
9219         chk->copy_by_ref = 0;
9220         chk->data = m_asconf;
9221         chk->send_size = len;
9222         chk->rec.chunk_id.id = SCTP_ASCONF;
9223         chk->rec.chunk_id.can_take_data = 0;
9224         chk->sent = SCTP_DATAGRAM_UNSENT;
9225         chk->snd_count = 0;
9226         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9227         chk->asoc = &stcb->asoc;
9228         chk->whoTo = net;
9229         if (chk->whoTo) {
9230                 atomic_add_int(&chk->whoTo->ref_count, 1);
9231         }
9232         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9233         chk->asoc->ctrl_queue_cnt++;
9234         return;
9235 }
9236
9237 void
9238 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9239 {
9240         /*
9241          * formulate and queue a asconf-ack back to sender. the asconf-ack
9242          * must be stored in the tcb.
9243          */
9244         struct sctp_tmit_chunk *chk;
9245         struct sctp_asconf_ack *ack, *latest_ack;
9246         struct mbuf *m_ack;
9247         struct sctp_nets *net = NULL;
9248
9249         SCTP_TCB_LOCK_ASSERT(stcb);
9250         /* Get the latest ASCONF-ACK */
9251         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9252         if (latest_ack == NULL) {
9253                 return;
9254         }
9255         if (latest_ack->last_sent_to != NULL &&
9256             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9257                 /* we're doing a retransmission */
9258                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9259                 if (net == NULL) {
9260                         /* no alternate */
9261                         if (stcb->asoc.last_control_chunk_from == NULL) {
9262                                 if (stcb->asoc.alternate) {
9263                                         net = stcb->asoc.alternate;
9264                                 } else {
9265                                         net = stcb->asoc.primary_destination;
9266                                 }
9267                         } else {
9268                                 net = stcb->asoc.last_control_chunk_from;
9269                         }
9270                 }
9271         } else {
9272                 /* normal case */
9273                 if (stcb->asoc.last_control_chunk_from == NULL) {
9274                         if (stcb->asoc.alternate) {
9275                                 net = stcb->asoc.alternate;
9276                         } else {
9277                                 net = stcb->asoc.primary_destination;
9278                         }
9279                 } else {
9280                         net = stcb->asoc.last_control_chunk_from;
9281                 }
9282         }
9283         latest_ack->last_sent_to = net;
9284
9285         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9286                 if (ack->data == NULL) {
9287                         continue;
9288                 }
9289                 /* copy the asconf_ack */
9290                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9291                 if (m_ack == NULL) {
9292                         /* couldn't copy it */
9293                         return;
9294                 }
9295 #ifdef SCTP_MBUF_LOGGING
9296                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9297                         struct mbuf *mat;
9298
9299                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9300                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9301                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9302                                 }
9303                         }
9304                 }
9305 #endif
9306
9307                 sctp_alloc_a_chunk(stcb, chk);
9308                 if (chk == NULL) {
9309                         /* no memory */
9310                         if (m_ack)
9311                                 sctp_m_freem(m_ack);
9312                         return;
9313                 }
9314                 chk->copy_by_ref = 0;
9315
9316                 chk->whoTo = net;
9317                 if (chk->whoTo) {
9318                         atomic_add_int(&chk->whoTo->ref_count, 1);
9319                 }
9320                 chk->data = m_ack;
9321                 chk->send_size = 0;
9322                 /* Get size */
9323                 chk->send_size = ack->len;
9324                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9325                 chk->rec.chunk_id.can_take_data = 1;
9326                 chk->sent = SCTP_DATAGRAM_UNSENT;
9327                 chk->snd_count = 0;
9328                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9329                 chk->asoc = &stcb->asoc;
9330
9331                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9332                 chk->asoc->ctrl_queue_cnt++;
9333         }
9334         return;
9335 }
9336
9337
9338 static int
9339 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9340     struct sctp_tcb *stcb,
9341     struct sctp_association *asoc,
9342     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9343 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9344     SCTP_UNUSED
9345 #endif
9346 )
9347 {
9348         /*-
9349          * send out one MTU of retransmission. If fast_retransmit is
9350          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9351          * rwnd. For a Cookie or Asconf in the control chunk queue we
9352          * retransmit them by themselves.
9353          *
9354          * For data chunks we will pick out the lowest TSN's in the sent_queue
9355          * marked for resend and bundle them all together (up to a MTU of
9356          * destination). The address to send to should have been
9357          * selected/changed where the retransmission was marked (i.e. in FR
9358          * or t3-timeout routines).
9359          */
9360         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9361         struct sctp_tmit_chunk *chk, *fwd;
9362         struct mbuf *m, *endofchain;
9363         struct sctp_nets *net = NULL;
9364         uint32_t tsns_sent = 0;
9365         int no_fragmentflg, bundle_at, cnt_thru;
9366         unsigned int mtu;
9367         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9368         struct sctp_auth_chunk *auth = NULL;
9369         uint32_t auth_offset = 0;
9370         uint16_t auth_keyid;
9371         int override_ok = 1;
9372         int data_auth_reqd = 0;
9373         uint32_t dmtu = 0;
9374
9375         SCTP_TCB_LOCK_ASSERT(stcb);
9376         tmr_started = ctl_cnt = bundle_at = error = 0;
9377         no_fragmentflg = 1;
9378         fwd_tsn = 0;
9379         *cnt_out = 0;
9380         fwd = NULL;
9381         endofchain = m = NULL;
9382         auth_keyid = stcb->asoc.authinfo.active_keyid;
9383 #ifdef SCTP_AUDITING_ENABLED
9384         sctp_audit_log(0xC3, 1);
9385 #endif
9386         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9387             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9388                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9389                     asoc->sent_queue_retran_cnt);
9390                 asoc->sent_queue_cnt = 0;
9391                 asoc->sent_queue_cnt_removeable = 0;
9392                 /* send back 0/0 so we enter normal transmission */
9393                 *cnt_out = 0;
9394                 return (0);
9395         }
9396         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9397                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9398                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9399                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9400                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9401                                 continue;
9402                         }
9403                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9404                                 if (chk != asoc->str_reset) {
9405                                         /*
9406                                          * not eligible for retran if its
9407                                          * not ours
9408                                          */
9409                                         continue;
9410                                 }
9411                         }
9412                         ctl_cnt++;
9413                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9414                                 fwd_tsn = 1;
9415                         }
9416                         /*
9417                          * Add an AUTH chunk, if chunk requires it save the
9418                          * offset into the chain for AUTH
9419                          */
9420                         if ((auth == NULL) &&
9421                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9422                             stcb->asoc.peer_auth_chunks))) {
9423                                 m = sctp_add_auth_chunk(m, &endofchain,
9424                                     &auth, &auth_offset,
9425                                     stcb,
9426                                     chk->rec.chunk_id.id);
9427                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9428                         }
9429                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9430                         break;
9431                 }
9432         }
9433         one_chunk = 0;
9434         cnt_thru = 0;
9435         /* do we have control chunks to retransmit? */
9436         if (m != NULL) {
9437                 /* Start a timer no matter if we suceed or fail */
9438                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9439                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9440                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9441                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9442                 chk->snd_count++;       /* update our count */
9443                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9444                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9445                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9446                     no_fragmentflg, 0, 0,
9447                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9448                     chk->whoTo->port, NULL,
9449                     0, 0,
9450                     so_locked))) {
9451                         SCTP_STAT_INCR(sctps_lowlevelerr);
9452                         return (error);
9453                 }
9454                 endofchain = NULL;
9455                 auth = NULL;
9456                 auth_offset = 0;
9457                 /*
9458                  * We don't want to mark the net->sent time here since this
9459                  * we use this for HB and retrans cannot measure RTT
9460                  */
9461                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9462                 *cnt_out += 1;
9463                 chk->sent = SCTP_DATAGRAM_SENT;
9464                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9465                 if (fwd_tsn == 0) {
9466                         return (0);
9467                 } else {
9468                         /* Clean up the fwd-tsn list */
9469                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9470                         return (0);
9471                 }
9472         }
9473         /*
9474          * Ok, it is just data retransmission we need to do or that and a
9475          * fwd-tsn with it all.
9476          */
9477         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9478                 return (SCTP_RETRAN_DONE);
9479         }
9480         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9481             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9482                 /* not yet open, resend the cookie and that is it */
9483                 return (1);
9484         }
9485 #ifdef SCTP_AUDITING_ENABLED
9486         sctp_auditing(20, inp, stcb, NULL);
9487 #endif
9488         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9489         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9490                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9491                         /* No, not sent to this net or not ready for rtx */
9492                         continue;
9493                 }
9494                 if (chk->data == NULL) {
9495                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9496                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9497                         continue;
9498                 }
9499                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9500                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9501                         /* Gak, we have exceeded max unlucky retran, abort! */
9502                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9503                             chk->snd_count,
9504                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9505                         atomic_add_int(&stcb->asoc.refcnt, 1);
9506                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9507                         SCTP_TCB_LOCK(stcb);
9508                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9509                         return (SCTP_RETRAN_EXIT);
9510                 }
9511                 /* pick up the net */
9512                 net = chk->whoTo;
9513                 switch (net->ro._l_addr.sa.sa_family) {
9514 #ifdef INET
9515                 case AF_INET:
9516                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9517                         break;
9518 #endif
9519 #ifdef INET6
9520                 case AF_INET6:
9521                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9522                         break;
9523 #endif
9524                 default:
9525                         /* TSNH */
9526                         mtu = net->mtu;
9527                         break;
9528                 }
9529
9530                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9531                         /* No room in peers rwnd */
9532                         uint32_t tsn;
9533
9534                         tsn = asoc->last_acked_seq + 1;
9535                         if (tsn == chk->rec.data.TSN_seq) {
9536                                 /*
9537                                  * we make a special exception for this
9538                                  * case. The peer has no rwnd but is missing
9539                                  * the lowest chunk.. which is probably what
9540                                  * is holding up the rwnd.
9541                                  */
9542                                 goto one_chunk_around;
9543                         }
9544                         return (1);
9545                 }
9546 one_chunk_around:
9547                 if (asoc->peers_rwnd < mtu) {
9548                         one_chunk = 1;
9549                         if ((asoc->peers_rwnd == 0) &&
9550                             (asoc->total_flight == 0)) {
9551                                 chk->window_probe = 1;
9552                                 chk->whoTo->window_probe = 1;
9553                         }
9554                 }
9555 #ifdef SCTP_AUDITING_ENABLED
9556                 sctp_audit_log(0xC3, 2);
9557 #endif
9558                 bundle_at = 0;
9559                 m = NULL;
9560                 net->fast_retran_ip = 0;
9561                 if (chk->rec.data.doing_fast_retransmit == 0) {
9562                         /*
9563                          * if no FR in progress skip destination that have
9564                          * flight_size > cwnd.
9565                          */
9566                         if (net->flight_size >= net->cwnd) {
9567                                 continue;
9568                         }
9569                 } else {
9570                         /*
9571                          * Mark the destination net to have FR recovery
9572                          * limits put on it.
9573                          */
9574                         *fr_done = 1;
9575                         net->fast_retran_ip = 1;
9576                 }
9577
9578                 /*
9579                  * if no AUTH is yet included and this chunk requires it,
9580                  * make sure to account for it.  We don't apply the size
9581                  * until the AUTH chunk is actually added below in case
9582                  * there is no room for this chunk.
9583                  */
9584                 if (data_auth_reqd && (auth == NULL)) {
9585                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9586                 } else
9587                         dmtu = 0;
9588
9589                 if ((chk->send_size <= (mtu - dmtu)) ||
9590                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9591                         /* ok we will add this one */
9592                         if (data_auth_reqd) {
9593                                 if (auth == NULL) {
9594                                         m = sctp_add_auth_chunk(m,
9595                                             &endofchain,
9596                                             &auth,
9597                                             &auth_offset,
9598                                             stcb,
9599                                             SCTP_DATA);
9600                                         auth_keyid = chk->auth_keyid;
9601                                         override_ok = 0;
9602                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9603                                 } else if (override_ok) {
9604                                         auth_keyid = chk->auth_keyid;
9605                                         override_ok = 0;
9606                                 } else if (chk->auth_keyid != auth_keyid) {
9607                                         /* different keyid, so done bundling */
9608                                         break;
9609                                 }
9610                         }
9611                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9612                         if (m == NULL) {
9613                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9614                                 return (ENOMEM);
9615                         }
9616                         /* Do clear IP_DF ? */
9617                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9618                                 no_fragmentflg = 0;
9619                         }
9620                         /* upate our MTU size */
9621                         if (mtu > (chk->send_size + dmtu))
9622                                 mtu -= (chk->send_size + dmtu);
9623                         else
9624                                 mtu = 0;
9625                         data_list[bundle_at++] = chk;
9626                         if (one_chunk && (asoc->total_flight <= 0)) {
9627                                 SCTP_STAT_INCR(sctps_windowprobed);
9628                         }
9629                 }
9630                 if (one_chunk == 0) {
9631                         /*
9632                          * now are there anymore forward from chk to pick
9633                          * up?
9634                          */
9635                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9636                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9637                                         /* Nope, not for retran */
9638                                         continue;
9639                                 }
9640                                 if (fwd->whoTo != net) {
9641                                         /* Nope, not the net in question */
9642                                         continue;
9643                                 }
9644                                 if (data_auth_reqd && (auth == NULL)) {
9645                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9646                                 } else
9647                                         dmtu = 0;
9648                                 if (fwd->send_size <= (mtu - dmtu)) {
9649                                         if (data_auth_reqd) {
9650                                                 if (auth == NULL) {
9651                                                         m = sctp_add_auth_chunk(m,
9652                                                             &endofchain,
9653                                                             &auth,
9654                                                             &auth_offset,
9655                                                             stcb,
9656                                                             SCTP_DATA);
9657                                                         auth_keyid = fwd->auth_keyid;
9658                                                         override_ok = 0;
9659                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9660                                                 } else if (override_ok) {
9661                                                         auth_keyid = fwd->auth_keyid;
9662                                                         override_ok = 0;
9663                                                 } else if (fwd->auth_keyid != auth_keyid) {
9664                                                         /*
9665                                                          * different keyid,
9666                                                          * so done bundling
9667                                                          */
9668                                                         break;
9669                                                 }
9670                                         }
9671                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9672                                         if (m == NULL) {
9673                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9674                                                 return (ENOMEM);
9675                                         }
9676                                         /* Do clear IP_DF ? */
9677                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9678                                                 no_fragmentflg = 0;
9679                                         }
9680                                         /* upate our MTU size */
9681                                         if (mtu > (fwd->send_size + dmtu))
9682                                                 mtu -= (fwd->send_size + dmtu);
9683                                         else
9684                                                 mtu = 0;
9685                                         data_list[bundle_at++] = fwd;
9686                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9687                                                 break;
9688                                         }
9689                                 } else {
9690                                         /* can't fit so we are done */
9691                                         break;
9692                                 }
9693                         }
9694                 }
9695                 /* Is there something to send for this destination? */
9696                 if (m) {
9697                         /*
9698                          * No matter if we fail/or suceed we should start a
9699                          * timer. A failure is like a lost IP packet :-)
9700                          */
9701                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9702                                 /*
9703                                  * no timer running on this destination
9704                                  * restart it.
9705                                  */
9706                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9707                                 tmr_started = 1;
9708                         }
9709                         /* Now lets send it, if there is anything to send :> */
9710                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9711                             (struct sockaddr *)&net->ro._l_addr, m,
9712                             auth_offset, auth, auth_keyid,
9713                             no_fragmentflg, 0, 0,
9714                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9715                             net->port, NULL,
9716                             0, 0,
9717                             so_locked))) {
9718                                 /* error, we could not output */
9719                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9720                                 return (error);
9721                         }
9722                         endofchain = NULL;
9723                         auth = NULL;
9724                         auth_offset = 0;
9725                         /* For HB's */
9726                         /*
9727                          * We don't want to mark the net->sent time here
9728                          * since this we use this for HB and retrans cannot
9729                          * measure RTT
9730                          */
9731                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9732
9733                         /* For auto-close */
9734                         cnt_thru++;
9735                         if (*now_filled == 0) {
9736                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9737                                 *now = asoc->time_last_sent;
9738                                 *now_filled = 1;
9739                         } else {
9740                                 asoc->time_last_sent = *now;
9741                         }
9742                         *cnt_out += bundle_at;
9743 #ifdef SCTP_AUDITING_ENABLED
9744                         sctp_audit_log(0xC4, bundle_at);
9745 #endif
9746                         if (bundle_at) {
9747                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9748                         }
9749                         for (i = 0; i < bundle_at; i++) {
9750                                 SCTP_STAT_INCR(sctps_sendretransdata);
9751                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9752                                 /*
9753                                  * When we have a revoked data, and we
9754                                  * retransmit it, then we clear the revoked
9755                                  * flag since this flag dictates if we
9756                                  * subtracted from the fs
9757                                  */
9758                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9759                                         /* Deflate the cwnd */
9760                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9761                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9762                                 }
9763                                 data_list[i]->snd_count++;
9764                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9765                                 /* record the time */
9766                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9767                                 if (data_list[i]->book_size_scale) {
9768                                         /*
9769                                          * need to double the book size on
9770                                          * this one
9771                                          */
9772                                         data_list[i]->book_size_scale = 0;
9773                                         /*
9774                                          * Since we double the booksize, we
9775                                          * must also double the output queue
9776                                          * size, since this get shrunk when
9777                                          * we free by this amount.
9778                                          */
9779                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9780                                         data_list[i]->book_size *= 2;
9781
9782
9783                                 } else {
9784                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9785                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9786                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9787                                         }
9788                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9789                                             (uint32_t) (data_list[i]->send_size +
9790                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9791                                 }
9792                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9793                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9794                                             data_list[i]->whoTo->flight_size,
9795                                             data_list[i]->book_size,
9796                                             (uintptr_t) data_list[i]->whoTo,
9797                                             data_list[i]->rec.data.TSN_seq);
9798                                 }
9799                                 sctp_flight_size_increase(data_list[i]);
9800                                 sctp_total_flight_increase(stcb, data_list[i]);
9801                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9802                                         /* SWS sender side engages */
9803                                         asoc->peers_rwnd = 0;
9804                                 }
9805                                 if ((i == 0) &&
9806                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9807                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9808                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9809                                             (tmr_started == 0)) {
9810                                                 /*-
9811                                                  * ok we just fast-retrans'd
9812                                                  * the lowest TSN, i.e the
9813                                                  * first on the list. In
9814                                                  * this case we want to give
9815                                                  * some more time to get a
9816                                                  * SACK back without a
9817                                                  * t3-expiring.
9818                                                  */
9819                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9820                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9821                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9822                                         }
9823                                 }
9824                         }
9825                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9826                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9827                         }
9828 #ifdef SCTP_AUDITING_ENABLED
9829                         sctp_auditing(21, inp, stcb, NULL);
9830 #endif
9831                 } else {
9832                         /* None will fit */
9833                         return (1);
9834                 }
9835                 if (asoc->sent_queue_retran_cnt <= 0) {
9836                         /* all done we have no more to retran */
9837                         asoc->sent_queue_retran_cnt = 0;
9838                         break;
9839                 }
9840                 if (one_chunk) {
9841                         /* No more room in rwnd */
9842                         return (1);
9843                 }
9844                 /* stop the for loop here. we sent out a packet */
9845                 break;
9846         }
9847         return (0);
9848 }
9849
9850 static void
9851 sctp_timer_validation(struct sctp_inpcb *inp,
9852     struct sctp_tcb *stcb,
9853     struct sctp_association *asoc)
9854 {
9855         struct sctp_nets *net;
9856
9857         /* Validate that a timer is running somewhere */
9858         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9859                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9860                         /* Here is a timer */
9861                         return;
9862                 }
9863         }
9864         SCTP_TCB_LOCK_ASSERT(stcb);
9865         /* Gak, we did not have a timer somewhere */
9866         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9867         if (asoc->alternate) {
9868                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9869         } else {
9870                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9871         }
9872         return;
9873 }
9874
9875 void
9876 sctp_chunk_output(struct sctp_inpcb *inp,
9877     struct sctp_tcb *stcb,
9878     int from_where,
9879     int so_locked
9880 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9881     SCTP_UNUSED
9882 #endif
9883 )
9884 {
9885         /*-
9886          * Ok this is the generic chunk service queue. we must do the
9887          * following:
9888          * - See if there are retransmits pending, if so we must
9889          *   do these first.
9890          * - Service the stream queue that is next, moving any
9891          *   message (note I must get a complete message i.e.
9892          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9893          *   TSN's
9894          * - Check to see if the cwnd/rwnd allows any output, if so we
9895          *   go ahead and fomulate and send the low level chunks. Making sure
9896          *   to combine any control in the control chunk queue also.
9897          */
9898         struct sctp_association *asoc;
9899         struct sctp_nets *net;
9900         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9901         unsigned int burst_cnt = 0;
9902         struct timeval now;
9903         int now_filled = 0;
9904         int nagle_on;
9905         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9906         int un_sent = 0;
9907         int fr_done;
9908         unsigned int tot_frs = 0;
9909
9910         asoc = &stcb->asoc;
9911         /* The Nagle algorithm is only applied when handling a send call. */
9912         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9913                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9914                         nagle_on = 0;
9915                 } else {
9916                         nagle_on = 1;
9917                 }
9918         } else {
9919                 nagle_on = 0;
9920         }
9921         SCTP_TCB_LOCK_ASSERT(stcb);
9922
9923         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9924
9925         if ((un_sent <= 0) &&
9926             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9927             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9928             (asoc->sent_queue_retran_cnt == 0)) {
9929                 /* Nothing to do unless there is something to be sent left */
9930                 return;
9931         }
9932         /*
9933          * Do we have something to send, data or control AND a sack timer
9934          * running, if so piggy-back the sack.
9935          */
9936         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9937                 sctp_send_sack(stcb, so_locked);
9938                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9939         }
9940         while (asoc->sent_queue_retran_cnt) {
9941                 /*-
9942                  * Ok, it is retransmission time only, we send out only ONE
9943                  * packet with a single call off to the retran code.
9944                  */
9945                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9946                         /*-
9947                          * Special hook for handling cookiess discarded
9948                          * by peer that carried data. Send cookie-ack only
9949                          * and then the next call with get the retran's.
9950                          */
9951                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9952                             from_where,
9953                             &now, &now_filled, frag_point, so_locked);
9954                         return;
9955                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9956                         /* if its not from a HB then do it */
9957                         fr_done = 0;
9958                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9959                         if (fr_done) {
9960                                 tot_frs++;
9961                         }
9962                 } else {
9963                         /*
9964                          * its from any other place, we don't allow retran
9965                          * output (only control)
9966                          */
9967                         ret = 1;
9968                 }
9969                 if (ret > 0) {
9970                         /* Can't send anymore */
9971                         /*-
9972                          * now lets push out control by calling med-level
9973                          * output once. this assures that we WILL send HB's
9974                          * if queued too.
9975                          */
9976                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9977                             from_where,
9978                             &now, &now_filled, frag_point, so_locked);
9979 #ifdef SCTP_AUDITING_ENABLED
9980                         sctp_auditing(8, inp, stcb, NULL);
9981 #endif
9982                         sctp_timer_validation(inp, stcb, asoc);
9983                         return;
9984                 }
9985                 if (ret < 0) {
9986                         /*-
9987                          * The count was off.. retran is not happening so do
9988                          * the normal retransmission.
9989                          */
9990 #ifdef SCTP_AUDITING_ENABLED
9991                         sctp_auditing(9, inp, stcb, NULL);
9992 #endif
9993                         if (ret == SCTP_RETRAN_EXIT) {
9994                                 return;
9995                         }
9996                         break;
9997                 }
9998                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9999                         /* Only one transmission allowed out of a timeout */
10000 #ifdef SCTP_AUDITING_ENABLED
10001                         sctp_auditing(10, inp, stcb, NULL);
10002 #endif
10003                         /* Push out any control */
10004                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10005                             &now, &now_filled, frag_point, so_locked);
10006                         return;
10007                 }
10008                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10009                         /* Hit FR burst limit */
10010                         return;
10011                 }
10012                 if ((num_out == 0) && (ret == 0)) {
10013                         /* No more retrans to send */
10014                         break;
10015                 }
10016         }
10017 #ifdef SCTP_AUDITING_ENABLED
10018         sctp_auditing(12, inp, stcb, NULL);
10019 #endif
10020         /* Check for bad destinations, if they exist move chunks around. */
10021         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10022                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10023                         /*-
10024                          * if possible move things off of this address we
10025                          * still may send below due to the dormant state but
10026                          * we try to find an alternate address to send to
10027                          * and if we have one we move all queued data on the
10028                          * out wheel to this alternate address.
10029                          */
10030                         if (net->ref_count > 1)
10031                                 sctp_move_chunks_from_net(stcb, net);
10032                 } else {
10033                         /*-
10034                          * if ((asoc->sat_network) || (net->addr_is_local))
10035                          * { burst_limit = asoc->max_burst *
10036                          * SCTP_SAT_NETWORK_BURST_INCR; }
10037                          */
10038                         if (asoc->max_burst > 0) {
10039                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10040                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10041                                                 /*
10042                                                  * JRS - Use the congestion
10043                                                  * control given in the
10044                                                  * congestion control module
10045                                                  */
10046                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10047                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10048                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10049                                                 }
10050                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10051                                         }
10052                                         net->fast_retran_ip = 0;
10053                                 } else {
10054                                         if (net->flight_size == 0) {
10055                                                 /*
10056                                                  * Should be decaying the
10057                                                  * cwnd here
10058                                                  */
10059                                                 ;
10060                                         }
10061                                 }
10062                         }
10063                 }
10064
10065         }
10066         burst_cnt = 0;
10067         do {
10068                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10069                     &reason_code, 0, from_where,
10070                     &now, &now_filled, frag_point, so_locked);
10071                 if (error) {
10072                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10073                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10074                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10075                         }
10076                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10077                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10078                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10079                         }
10080                         break;
10081                 }
10082                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10083
10084                 tot_out += num_out;
10085                 burst_cnt++;
10086                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10087                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10088                         if (num_out == 0) {
10089                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10090                         }
10091                 }
10092                 if (nagle_on) {
10093                         /*
10094                          * When the Nagle algorithm is used, look at how
10095                          * much is unsent, then if its smaller than an MTU
10096                          * and we have data in flight we stop, except if we
10097                          * are handling a fragmented user message.
10098                          */
10099                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10100                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10101                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10102                             (stcb->asoc.total_flight > 0) &&
10103                             ((stcb->asoc.locked_on_sending == NULL) ||
10104                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10105                                 break;
10106                         }
10107                 }
10108                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10109                     TAILQ_EMPTY(&asoc->send_queue) &&
10110                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10111                         /* Nothing left to send */
10112                         break;
10113                 }
10114                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10115                         /* Nothing left to send */
10116                         break;
10117                 }
10118         } while (num_out &&
10119             ((asoc->max_burst == 0) ||
10120             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10121             (burst_cnt < asoc->max_burst)));
10122
10123         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10124                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10125                         SCTP_STAT_INCR(sctps_maxburstqueued);
10126                         asoc->burst_limit_applied = 1;
10127                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10128                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10129                         }
10130                 } else {
10131                         asoc->burst_limit_applied = 0;
10132                 }
10133         }
10134         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10135                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10136         }
10137         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10138             tot_out);
10139
10140         /*-
10141          * Now we need to clean up the control chunk chain if a ECNE is on
10142          * it. It must be marked as UNSENT again so next call will continue
10143          * to send it until such time that we get a CWR, to remove it.
10144          */
10145         if (stcb->asoc.ecn_echo_cnt_onq)
10146                 sctp_fix_ecn_echo(asoc);
10147         return;
10148 }
10149
10150
10151 int
10152 sctp_output(
10153     struct sctp_inpcb *inp,
10154     struct mbuf *m,
10155     struct sockaddr *addr,
10156     struct mbuf *control,
10157     struct thread *p,
10158     int flags)
10159 {
10160         if (inp == NULL) {
10161                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10162                 return (EINVAL);
10163         }
10164         if (inp->sctp_socket == NULL) {
10165                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10166                 return (EINVAL);
10167         }
10168         return (sctp_sosend(inp->sctp_socket,
10169             addr,
10170             (struct uio *)NULL,
10171             m,
10172             control,
10173             flags, p
10174             ));
10175 }
10176
10177 void
10178 send_forward_tsn(struct sctp_tcb *stcb,
10179     struct sctp_association *asoc)
10180 {
10181         struct sctp_tmit_chunk *chk;
10182         struct sctp_forward_tsn_chunk *fwdtsn;
10183         uint32_t advance_peer_ack_point;
10184
10185         SCTP_TCB_LOCK_ASSERT(stcb);
10186         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10187                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10188                         /* mark it to unsent */
10189                         chk->sent = SCTP_DATAGRAM_UNSENT;
10190                         chk->snd_count = 0;
10191                         /* Do we correct its output location? */
10192                         if (chk->whoTo) {
10193                                 sctp_free_remote_addr(chk->whoTo);
10194                                 chk->whoTo = NULL;
10195                         }
10196                         goto sctp_fill_in_rest;
10197                 }
10198         }
10199         /* Ok if we reach here we must build one */
10200         sctp_alloc_a_chunk(stcb, chk);
10201         if (chk == NULL) {
10202                 return;
10203         }
10204         asoc->fwd_tsn_cnt++;
10205         chk->copy_by_ref = 0;
10206         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10207         chk->rec.chunk_id.can_take_data = 0;
10208         chk->asoc = asoc;
10209         chk->whoTo = NULL;
10210         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10211         if (chk->data == NULL) {
10212                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10213                 return;
10214         }
10215         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10216         chk->sent = SCTP_DATAGRAM_UNSENT;
10217         chk->snd_count = 0;
10218         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10219         asoc->ctrl_queue_cnt++;
10220 sctp_fill_in_rest:
10221         /*-
10222          * Here we go through and fill out the part that deals with
10223          * stream/seq of the ones we skip.
10224          */
10225         SCTP_BUF_LEN(chk->data) = 0;
10226         {
10227                 struct sctp_tmit_chunk *at, *tp1, *last;
10228                 struct sctp_strseq *strseq;
10229                 unsigned int cnt_of_space, i, ovh;
10230                 unsigned int space_needed;
10231                 unsigned int cnt_of_skipped = 0;
10232
10233                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10234                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10235                                 /* no more to look at */
10236                                 break;
10237                         }
10238                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10239                                 /* We don't report these */
10240                                 continue;
10241                         }
10242                         cnt_of_skipped++;
10243                 }
10244                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10245                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10246
10247                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10248
10249                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10250                         ovh = SCTP_MIN_OVERHEAD;
10251                 } else {
10252                         ovh = SCTP_MIN_V4_OVERHEAD;
10253                 }
10254                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10255                         /* trim to a mtu size */
10256                         cnt_of_space = asoc->smallest_mtu - ovh;
10257                 }
10258                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10259                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10260                             0xff, 0, cnt_of_skipped,
10261                             asoc->advanced_peer_ack_point);
10262
10263                 }
10264                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10265                 if (cnt_of_space < space_needed) {
10266                         /*-
10267                          * ok we must trim down the chunk by lowering the
10268                          * advance peer ack point.
10269                          */
10270                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10271                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10272                                     0xff, 0xff, cnt_of_space,
10273                                     space_needed);
10274                         }
10275                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10276                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10277                         /*-
10278                          * Go through and find the TSN that will be the one
10279                          * we report.
10280                          */
10281                         at = TAILQ_FIRST(&asoc->sent_queue);
10282                         if (at != NULL) {
10283                                 for (i = 0; i < cnt_of_skipped; i++) {
10284                                         tp1 = TAILQ_NEXT(at, sctp_next);
10285                                         if (tp1 == NULL) {
10286                                                 break;
10287                                         }
10288                                         at = tp1;
10289                                 }
10290                         }
10291                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10292                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10293                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10294                                     asoc->advanced_peer_ack_point);
10295                         }
10296                         last = at;
10297                         /*-
10298                          * last now points to last one I can report, update
10299                          * peer ack point
10300                          */
10301                         if (last)
10302                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10303                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10304                             cnt_of_skipped * sizeof(struct sctp_strseq);
10305                 }
10306                 chk->send_size = space_needed;
10307                 /* Setup the chunk */
10308                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10309                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10310                 fwdtsn->ch.chunk_flags = 0;
10311                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10312                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10313                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10314                 fwdtsn++;
10315                 /*-
10316                  * Move pointer to after the fwdtsn and transfer to the
10317                  * strseq pointer.
10318                  */
10319                 strseq = (struct sctp_strseq *)fwdtsn;
10320                 /*-
10321                  * Now populate the strseq list. This is done blindly
10322                  * without pulling out duplicate stream info. This is
10323                  * inefficent but won't harm the process since the peer will
10324                  * look at these in sequence and will thus release anything.
10325                  * It could mean we exceed the PMTU and chop off some that
10326                  * we could have included.. but this is unlikely (aka 1432/4
10327                  * would mean 300+ stream seq's would have to be reported in
10328                  * one FWD-TSN. With a bit of work we can later FIX this to
10329                  * optimize and pull out duplcates.. but it does add more
10330                  * overhead. So for now... not!
10331                  */
10332                 at = TAILQ_FIRST(&asoc->sent_queue);
10333                 for (i = 0; i < cnt_of_skipped; i++) {
10334                         tp1 = TAILQ_NEXT(at, sctp_next);
10335                         if (tp1 == NULL)
10336                                 break;
10337                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10338                                 /* We don't report these */
10339                                 i--;
10340                                 at = tp1;
10341                                 continue;
10342                         }
10343                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10344                                 at->rec.data.fwd_tsn_cnt = 0;
10345                         }
10346                         strseq->stream = ntohs(at->rec.data.stream_number);
10347                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10348                         strseq++;
10349                         at = tp1;
10350                 }
10351         }
10352         return;
10353 }
10354
10355 void
10356 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10357 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10358     SCTP_UNUSED
10359 #endif
10360 )
10361 {
10362         /*-
10363          * Queue up a SACK or NR-SACK in the control queue.
10364          * We must first check to see if a SACK or NR-SACK is
10365          * somehow on the control queue.
10366          * If so, we will take and and remove the old one.
10367          */
10368         struct sctp_association *asoc;
10369         struct sctp_tmit_chunk *chk, *a_chk;
10370         struct sctp_sack_chunk *sack;
10371         struct sctp_nr_sack_chunk *nr_sack;
10372         struct sctp_gap_ack_block *gap_descriptor;
10373         struct sack_track *selector;
10374         int mergeable = 0;
10375         int offset;
10376         caddr_t limit;
10377         uint32_t *dup;
10378         int limit_reached = 0;
10379         unsigned int i, siz, j;
10380         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10381         int num_dups = 0;
10382         int space_req;
10383         uint32_t highest_tsn;
10384         uint8_t flags;
10385         uint8_t type;
10386         uint8_t tsn_map;
10387
10388         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10389             (stcb->asoc.peer_supports_nr_sack == 1)) {
10390                 type = SCTP_NR_SELECTIVE_ACK;
10391         } else {
10392                 type = SCTP_SELECTIVE_ACK;
10393         }
10394         a_chk = NULL;
10395         asoc = &stcb->asoc;
10396         SCTP_TCB_LOCK_ASSERT(stcb);
10397         if (asoc->last_data_chunk_from == NULL) {
10398                 /* Hmm we never received anything */
10399                 return;
10400         }
10401         sctp_slide_mapping_arrays(stcb);
10402         sctp_set_rwnd(stcb, asoc);
10403         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10404                 if (chk->rec.chunk_id.id == type) {
10405                         /* Hmm, found a sack already on queue, remove it */
10406                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10407                         asoc->ctrl_queue_cnt--;
10408                         a_chk = chk;
10409                         if (a_chk->data) {
10410                                 sctp_m_freem(a_chk->data);
10411                                 a_chk->data = NULL;
10412                         }
10413                         if (a_chk->whoTo) {
10414                                 sctp_free_remote_addr(a_chk->whoTo);
10415                                 a_chk->whoTo = NULL;
10416                         }
10417                         break;
10418                 }
10419         }
10420         if (a_chk == NULL) {
10421                 sctp_alloc_a_chunk(stcb, a_chk);
10422                 if (a_chk == NULL) {
10423                         /* No memory so we drop the idea, and set a timer */
10424                         if (stcb->asoc.delayed_ack) {
10425                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10426                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10427                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10428                                     stcb->sctp_ep, stcb, NULL);
10429                         } else {
10430                                 stcb->asoc.send_sack = 1;
10431                         }
10432                         return;
10433                 }
10434                 a_chk->copy_by_ref = 0;
10435                 a_chk->rec.chunk_id.id = type;
10436                 a_chk->rec.chunk_id.can_take_data = 1;
10437         }
10438         /* Clear our pkt counts */
10439         asoc->data_pkts_seen = 0;
10440
10441         a_chk->asoc = asoc;
10442         a_chk->snd_count = 0;
10443         a_chk->send_size = 0;   /* fill in later */
10444         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10445         a_chk->whoTo = NULL;
10446
10447         if ((asoc->numduptsns) ||
10448             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10449                 /*-
10450                  * Ok, we have some duplicates or the destination for the
10451                  * sack is unreachable, lets see if we can select an
10452                  * alternate than asoc->last_data_chunk_from
10453                  */
10454                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10455                     (asoc->used_alt_onsack > asoc->numnets)) {
10456                         /* We used an alt last time, don't this time */
10457                         a_chk->whoTo = NULL;
10458                 } else {
10459                         asoc->used_alt_onsack++;
10460                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10461                 }
10462                 if (a_chk->whoTo == NULL) {
10463                         /* Nope, no alternate */
10464                         a_chk->whoTo = asoc->last_data_chunk_from;
10465                         asoc->used_alt_onsack = 0;
10466                 }
10467         } else {
10468                 /*
10469                  * No duplicates so we use the last place we received data
10470                  * from.
10471                  */
10472                 asoc->used_alt_onsack = 0;
10473                 a_chk->whoTo = asoc->last_data_chunk_from;
10474         }
10475         if (a_chk->whoTo) {
10476                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10477         }
10478         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10479                 highest_tsn = asoc->highest_tsn_inside_map;
10480         } else {
10481                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10482         }
10483         if (highest_tsn == asoc->cumulative_tsn) {
10484                 /* no gaps */
10485                 if (type == SCTP_SELECTIVE_ACK) {
10486                         space_req = sizeof(struct sctp_sack_chunk);
10487                 } else {
10488                         space_req = sizeof(struct sctp_nr_sack_chunk);
10489                 }
10490         } else {
10491                 /* gaps get a cluster */
10492                 space_req = MCLBYTES;
10493         }
10494         /* Ok now lets formulate a MBUF with our sack */
10495         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10496         if ((a_chk->data == NULL) ||
10497             (a_chk->whoTo == NULL)) {
10498                 /* rats, no mbuf memory */
10499                 if (a_chk->data) {
10500                         /* was a problem with the destination */
10501                         sctp_m_freem(a_chk->data);
10502                         a_chk->data = NULL;
10503                 }
10504                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10505                 /* sa_ignore NO_NULL_CHK */
10506                 if (stcb->asoc.delayed_ack) {
10507                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10508                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10509                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10510                             stcb->sctp_ep, stcb, NULL);
10511                 } else {
10512                         stcb->asoc.send_sack = 1;
10513                 }
10514                 return;
10515         }
10516         /* ok, lets go through and fill it in */
10517         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10518         space = M_TRAILINGSPACE(a_chk->data);
10519         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10520                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10521         }
10522         limit = mtod(a_chk->data, caddr_t);
10523         limit += space;
10524
10525         flags = 0;
10526
10527         if ((asoc->sctp_cmt_on_off > 0) &&
10528             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10529                 /*-
10530                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10531                  * received, then set high bit to 1, else 0. Reset
10532                  * pkts_rcvd.
10533                  */
10534                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10535                 asoc->cmt_dac_pkts_rcvd = 0;
10536         }
10537 #ifdef SCTP_ASOCLOG_OF_TSNS
10538         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10539         stcb->asoc.cumack_log_atsnt++;
10540         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10541                 stcb->asoc.cumack_log_atsnt = 0;
10542         }
10543 #endif
10544         /* reset the readers interpretation */
10545         stcb->freed_by_sorcv_sincelast = 0;
10546
10547         if (type == SCTP_SELECTIVE_ACK) {
10548                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10549                 nr_sack = NULL;
10550                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10551                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10552                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10553                 } else {
10554                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10555                 }
10556         } else {
10557                 sack = NULL;
10558                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10559                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10560                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10561                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10562                 } else {
10563                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10564                 }
10565         }
10566
10567         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10568                 offset = 1;
10569         } else {
10570                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10571         }
10572         if (((type == SCTP_SELECTIVE_ACK) &&
10573             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10574             ((type == SCTP_NR_SELECTIVE_ACK) &&
10575             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10576                 /* we have a gap .. maybe */
10577                 for (i = 0; i < siz; i++) {
10578                         tsn_map = asoc->mapping_array[i];
10579                         if (type == SCTP_SELECTIVE_ACK) {
10580                                 tsn_map |= asoc->nr_mapping_array[i];
10581                         }
10582                         if (i == 0) {
10583                                 /*
10584                                  * Clear all bits corresponding to TSNs
10585                                  * smaller or equal to the cumulative TSN.
10586                                  */
10587                                 tsn_map &= (~0 << (1 - offset));
10588                         }
10589                         selector = &sack_array[tsn_map];
10590                         if (mergeable && selector->right_edge) {
10591                                 /*
10592                                  * Backup, left and right edges were ok to
10593                                  * merge.
10594                                  */
10595                                 num_gap_blocks--;
10596                                 gap_descriptor--;
10597                         }
10598                         if (selector->num_entries == 0)
10599                                 mergeable = 0;
10600                         else {
10601                                 for (j = 0; j < selector->num_entries; j++) {
10602                                         if (mergeable && selector->right_edge) {
10603                                                 /*
10604                                                  * do a merge by NOT setting
10605                                                  * the left side
10606                                                  */
10607                                                 mergeable = 0;
10608                                         } else {
10609                                                 /*
10610                                                  * no merge, set the left
10611                                                  * side
10612                                                  */
10613                                                 mergeable = 0;
10614                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10615                                         }
10616                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10617                                         num_gap_blocks++;
10618                                         gap_descriptor++;
10619                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10620                                                 /* no more room */
10621                                                 limit_reached = 1;
10622                                                 break;
10623                                         }
10624                                 }
10625                                 if (selector->left_edge) {
10626                                         mergeable = 1;
10627                                 }
10628                         }
10629                         if (limit_reached) {
10630                                 /* Reached the limit stop */
10631                                 break;
10632                         }
10633                         offset += 8;
10634                 }
10635         }
10636         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10637             (limit_reached == 0)) {
10638
10639                 mergeable = 0;
10640
10641                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10642                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10643                 } else {
10644                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10645                 }
10646
10647                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10648                         offset = 1;
10649                 } else {
10650                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10651                 }
10652                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10653                         /* we have a gap .. maybe */
10654                         for (i = 0; i < siz; i++) {
10655                                 tsn_map = asoc->nr_mapping_array[i];
10656                                 if (i == 0) {
10657                                         /*
10658                                          * Clear all bits corresponding to
10659                                          * TSNs smaller or equal to the
10660                                          * cumulative TSN.
10661                                          */
10662                                         tsn_map &= (~0 << (1 - offset));
10663                                 }
10664                                 selector = &sack_array[tsn_map];
10665                                 if (mergeable && selector->right_edge) {
10666                                         /*
10667                                          * Backup, left and right edges were
10668                                          * ok to merge.
10669                                          */
10670                                         num_nr_gap_blocks--;
10671                                         gap_descriptor--;
10672                                 }
10673                                 if (selector->num_entries == 0)
10674                                         mergeable = 0;
10675                                 else {
10676                                         for (j = 0; j < selector->num_entries; j++) {
10677                                                 if (mergeable && selector->right_edge) {
10678                                                         /*
10679                                                          * do a merge by NOT
10680                                                          * setting the left
10681                                                          * side
10682                                                          */
10683                                                         mergeable = 0;
10684                                                 } else {
10685                                                         /*
10686                                                          * no merge, set the
10687                                                          * left side
10688                                                          */
10689                                                         mergeable = 0;
10690                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10691                                                 }
10692                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10693                                                 num_nr_gap_blocks++;
10694                                                 gap_descriptor++;
10695                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10696                                                         /* no more room */
10697                                                         limit_reached = 1;
10698                                                         break;
10699                                                 }
10700                                         }
10701                                         if (selector->left_edge) {
10702                                                 mergeable = 1;
10703                                         }
10704                                 }
10705                                 if (limit_reached) {
10706                                         /* Reached the limit stop */
10707                                         break;
10708                                 }
10709                                 offset += 8;
10710                         }
10711                 }
10712         }
10713         /* now we must add any dups we are going to report. */
10714         if ((limit_reached == 0) && (asoc->numduptsns)) {
10715                 dup = (uint32_t *) gap_descriptor;
10716                 for (i = 0; i < asoc->numduptsns; i++) {
10717                         *dup = htonl(asoc->dup_tsns[i]);
10718                         dup++;
10719                         num_dups++;
10720                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10721                                 /* no more room */
10722                                 break;
10723                         }
10724                 }
10725                 asoc->numduptsns = 0;
10726         }
10727         /*
10728          * now that the chunk is prepared queue it to the control chunk
10729          * queue.
10730          */
10731         if (type == SCTP_SELECTIVE_ACK) {
10732                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10733                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10734                     num_dups * sizeof(int32_t);
10735                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10736                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10737                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10738                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10739                 sack->sack.num_dup_tsns = htons(num_dups);
10740                 sack->ch.chunk_type = type;
10741                 sack->ch.chunk_flags = flags;
10742                 sack->ch.chunk_length = htons(a_chk->send_size);
10743         } else {
10744                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10745                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10746                     num_dups * sizeof(int32_t);
10747                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10748                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10749                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10750                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10751                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10752                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10753                 nr_sack->nr_sack.reserved = 0;
10754                 nr_sack->ch.chunk_type = type;
10755                 nr_sack->ch.chunk_flags = flags;
10756                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10757         }
10758         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10759         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10760         asoc->ctrl_queue_cnt++;
10761         asoc->send_sack = 0;
10762         SCTP_STAT_INCR(sctps_sendsacks);
10763         return;
10764 }
10765
10766 void
10767 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10768 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10769     SCTP_UNUSED
10770 #endif
10771 )
10772 {
10773         struct mbuf *m_abort;
10774         struct mbuf *m_out = NULL, *m_end = NULL;
10775         struct sctp_abort_chunk *abort = NULL;
10776         int sz;
10777         uint32_t auth_offset = 0;
10778         struct sctp_auth_chunk *auth = NULL;
10779         struct sctp_nets *net;
10780
10781         /*-
10782          * Add an AUTH chunk, if chunk requires it and save the offset into
10783          * the chain for AUTH
10784          */
10785         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10786             stcb->asoc.peer_auth_chunks)) {
10787                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10788                     stcb, SCTP_ABORT_ASSOCIATION);
10789                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10790         }
10791         SCTP_TCB_LOCK_ASSERT(stcb);
10792         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10793         if (m_abort == NULL) {
10794                 /* no mbuf's */
10795                 if (m_out)
10796                         sctp_m_freem(m_out);
10797                 return;
10798         }
10799         /* link in any error */
10800         SCTP_BUF_NEXT(m_abort) = operr;
10801         sz = 0;
10802         if (operr) {
10803                 struct mbuf *n;
10804
10805                 n = operr;
10806                 while (n) {
10807                         sz += SCTP_BUF_LEN(n);
10808                         n = SCTP_BUF_NEXT(n);
10809                 }
10810         }
10811         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10812         if (m_out == NULL) {
10813                 /* NO Auth chunk prepended, so reserve space in front */
10814                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10815                 m_out = m_abort;
10816         } else {
10817                 /* Put AUTH chunk at the front of the chain */
10818                 SCTP_BUF_NEXT(m_end) = m_abort;
10819         }
10820         if (stcb->asoc.alternate) {
10821                 net = stcb->asoc.alternate;
10822         } else {
10823                 net = stcb->asoc.primary_destination;
10824         }
10825         /* fill in the ABORT chunk */
10826         abort = mtod(m_abort, struct sctp_abort_chunk *);
10827         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10828         abort->ch.chunk_flags = 0;
10829         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10830
10831         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10832             (struct sockaddr *)&net->ro._l_addr,
10833             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10834             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10835             stcb->asoc.primary_destination->port, NULL,
10836             0, 0,
10837             so_locked);
10838         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10839 }
10840
10841 void
10842 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10843     struct sctp_nets *net,
10844     int reflect_vtag)
10845 {
10846         /* formulate and SEND a SHUTDOWN-COMPLETE */
10847         struct mbuf *m_shutdown_comp;
10848         struct sctp_shutdown_complete_chunk *shutdown_complete;
10849         uint32_t vtag;
10850         uint8_t flags;
10851
10852         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10853         if (m_shutdown_comp == NULL) {
10854                 /* no mbuf's */
10855                 return;
10856         }
10857         if (reflect_vtag) {
10858                 flags = SCTP_HAD_NO_TCB;
10859                 vtag = stcb->asoc.my_vtag;
10860         } else {
10861                 flags = 0;
10862                 vtag = stcb->asoc.peer_vtag;
10863         }
10864         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10865         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10866         shutdown_complete->ch.chunk_flags = flags;
10867         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10868         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10869         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10870             (struct sockaddr *)&net->ro._l_addr,
10871             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10872             stcb->sctp_ep->sctp_lport, stcb->rport,
10873             htonl(vtag),
10874             net->port, NULL,
10875             0, 0,
10876             SCTP_SO_NOT_LOCKED);
10877         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10878         return;
10879 }
10880
10881 static void
10882 sctp_send_resp_msg(struct mbuf *m, struct sctphdr *sh, uint32_t vtag,
10883     uint8_t type, struct mbuf *cause,
10884     uint8_t use_mflowid, uint32_t mflowid,
10885     uint32_t vrf_id, uint16_t port)
10886 {
10887         struct mbuf *o_pak;
10888         struct mbuf *mout;
10889         struct sctphdr *shout;
10890         struct sctp_chunkhdr *ch;
10891         struct ip *iph;
10892         struct udphdr *udp;
10893         int len, cause_len, padding_len, ret;
10894
10895 #ifdef INET
10896         sctp_route_t ro;
10897         struct ip *iph_out;
10898
10899 #endif
10900 #ifdef INET6
10901         struct ip6_hdr *ip6, *ip6_out;
10902
10903 #endif
10904
10905         /* Compute the length of the cause and add final padding. */
10906         cause_len = 0;
10907         if (cause != NULL) {
10908                 struct mbuf *m_at, *m_last = NULL;
10909
10910                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10911                         if (SCTP_BUF_NEXT(m_at) == NULL)
10912                                 m_last = m_at;
10913                         cause_len += SCTP_BUF_LEN(m_at);
10914                 }
10915                 padding_len = cause_len % 4;
10916                 if (padding_len != 0) {
10917                         padding_len = 4 - padding_len;
10918                 }
10919                 if (padding_len != 0) {
10920                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10921                                 sctp_m_freem(cause);
10922                                 return;
10923                         }
10924                 }
10925         } else {
10926                 padding_len = 0;
10927         }
10928         /* Get an mbuf for the header. */
10929         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10930         iph = mtod(m, struct ip *);
10931         switch (iph->ip_v) {
10932 #ifdef INET
10933         case IPVERSION:
10934                 len += sizeof(struct ip);
10935                 break;
10936 #endif
10937 #ifdef INET6
10938         case IPV6_VERSION >> 4:
10939                 len += sizeof(struct ip6_hdr);
10940                 break;
10941 #endif
10942         default:
10943                 break;
10944         }
10945         if (port) {
10946                 len += sizeof(struct udphdr);
10947         }
10948         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10949         if (mout == NULL) {
10950                 if (cause) {
10951                         sctp_m_freem(cause);
10952                 }
10953                 return;
10954         }
10955         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10956         SCTP_BUF_LEN(mout) = len;
10957         SCTP_BUF_NEXT(mout) = cause;
10958         if (use_mflowid != 0) {
10959                 mout->m_pkthdr.flowid = mflowid;
10960                 mout->m_flags |= M_FLOWID;
10961         }
10962 #ifdef INET
10963         iph_out = NULL;
10964 #endif
10965 #ifdef INET6
10966         ip6_out = NULL;
10967 #endif
10968         switch (iph->ip_v) {
10969 #ifdef INET
10970         case IPVERSION:
10971                 iph_out = mtod(mout, struct ip *);
10972                 iph_out->ip_v = IPVERSION;
10973                 iph_out->ip_hl = (sizeof(struct ip) >> 2);
10974                 iph_out->ip_tos = 0;
10975                 iph_out->ip_id = ip_newid();
10976                 iph_out->ip_off = 0;
10977                 iph_out->ip_ttl = MODULE_GLOBAL(ip_defttl);
10978                 if (port) {
10979                         iph_out->ip_p = IPPROTO_UDP;
10980                 } else {
10981                         iph_out->ip_p = IPPROTO_SCTP;
10982                 }
10983                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10984                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10985                 iph_out->ip_sum = 0;
10986                 len = sizeof(struct ip);
10987                 shout = (struct sctphdr *)((caddr_t)iph_out + len);
10988                 break;
10989 #endif
10990 #ifdef INET6
10991         case IPV6_VERSION >> 4:
10992                 ip6 = (struct ip6_hdr *)iph;
10993                 ip6_out = mtod(mout, struct ip6_hdr *);
10994                 ip6_out->ip6_flow = htonl(0x60000000);
10995                 if (V_ip6_auto_flowlabel) {
10996                         ip6_out->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10997                 }
10998                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10999                 if (port) {
11000                         ip6_out->ip6_nxt = IPPROTO_UDP;
11001                 } else {
11002                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11003                 }
11004                 ip6_out->ip6_src = ip6->ip6_dst;
11005                 ip6_out->ip6_dst = ip6->ip6_src;
11006                 len = sizeof(struct ip6_hdr);
11007                 shout = (struct sctphdr *)((caddr_t)ip6_out + len);
11008                 break;
11009 #endif
11010         default:
11011                 len = 0;
11012                 shout = mtod(mout, struct sctphdr *);
11013                 break;
11014         }
11015         if (port) {
11016                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11017                         sctp_m_freem(mout);
11018                         return;
11019                 }
11020                 udp = (struct udphdr *)shout;
11021                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11022                 udp->uh_dport = port;
11023                 udp->uh_sum = 0;
11024                 udp->uh_ulen = htons(sizeof(struct udphdr) +
11025                     sizeof(struct sctphdr) +
11026                     sizeof(struct sctp_chunkhdr) +
11027                     cause_len + padding_len);
11028                 len += sizeof(struct udphdr);
11029                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11030         } else {
11031                 udp = NULL;
11032         }
11033         shout->src_port = sh->dest_port;
11034         shout->dest_port = sh->src_port;
11035         shout->checksum = 0;
11036         if (vtag) {
11037                 shout->v_tag = htonl(vtag);
11038         } else {
11039                 shout->v_tag = sh->v_tag;
11040         }
11041         len += sizeof(struct sctphdr);
11042         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11043         ch->chunk_type = type;
11044         if (vtag) {
11045                 ch->chunk_flags = 0;
11046         } else {
11047                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11048         }
11049         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11050         len += sizeof(struct sctp_chunkhdr);
11051         len += cause_len + padding_len;
11052
11053         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11054                 sctp_m_freem(mout);
11055                 return;
11056         }
11057         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11058 #ifdef INET
11059         if (iph_out != NULL) {
11060                 /* zap the stack pointer to the route */
11061                 bzero(&ro, sizeof(sctp_route_t));
11062                 if (port) {
11063                         if (V_udp_cksum) {
11064                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11065                         } else {
11066                                 udp->uh_sum = 0;
11067                         }
11068                 }
11069                 iph_out->ip_len = len;
11070                 if (port) {
11071 #if defined(SCTP_WITH_NO_CSUM)
11072                         SCTP_STAT_INCR(sctps_sendnocrc);
11073 #else
11074                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11075                         SCTP_STAT_INCR(sctps_sendswcrc);
11076 #endif
11077                         if (V_udp_cksum) {
11078                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11079                         }
11080                 } else {
11081 #if defined(SCTP_WITH_NO_CSUM)
11082                         SCTP_STAT_INCR(sctps_sendnocrc);
11083 #else
11084                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11085                         mout->m_pkthdr.csum_data = 0;
11086                         SCTP_STAT_INCR(sctps_sendhwcrc);
11087 #endif
11088                 }
11089 #ifdef SCTP_PACKET_LOGGING
11090                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11091                         sctp_packet_log(o_pak);
11092                 }
11093 #endif
11094                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11095                 /* Free the route if we got one back */
11096                 if (ro.ro_rt) {
11097                         RTFREE(ro.ro_rt);
11098                 }
11099         }
11100 #endif
11101 #ifdef INET6
11102         if (ip6_out != NULL) {
11103                 ip6_out->ip6_plen = len - sizeof(struct ip6_hdr);
11104                 if (port) {
11105 #if defined(SCTP_WITH_NO_CSUM)
11106                         SCTP_STAT_INCR(sctps_sendnocrc);
11107 #else
11108                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11109                         SCTP_STAT_INCR(sctps_sendswcrc);
11110 #endif
11111                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11112                                 udp->uh_sum = 0xffff;
11113                         }
11114                 } else {
11115 #if defined(SCTP_WITH_NO_CSUM)
11116                         SCTP_STAT_INCR(sctps_sendnocrc);
11117 #else
11118                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11119                         mout->m_pkthdr.csum_data = 0;
11120                         SCTP_STAT_INCR(sctps_sendhwcrc);
11121 #endif
11122                 }
11123 #ifdef SCTP_PACKET_LOGGING
11124                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11125                         sctp_packet_log(o_pak);
11126                 }
11127 #endif
11128                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11129         }
11130 #endif
11131         SCTP_STAT_INCR(sctps_sendpackets);
11132         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11133         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11134         return;
11135 }
11136
11137 void
11138 sctp_send_shutdown_complete2(struct mbuf *m, struct sctphdr *sh,
11139     uint8_t use_mflowid, uint32_t mflowid,
11140     uint32_t vrf_id, uint16_t port)
11141 {
11142         sctp_send_resp_msg(m, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11143             use_mflowid, mflowid,
11144             vrf_id, port);
11145 }
11146
11147 void
11148 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11149 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11150     SCTP_UNUSED
11151 #endif
11152 )
11153 {
11154         struct sctp_tmit_chunk *chk;
11155         struct sctp_heartbeat_chunk *hb;
11156         struct timeval now;
11157
11158         SCTP_TCB_LOCK_ASSERT(stcb);
11159         if (net == NULL) {
11160                 return;
11161         }
11162         (void)SCTP_GETTIME_TIMEVAL(&now);
11163         switch (net->ro._l_addr.sa.sa_family) {
11164 #ifdef INET
11165         case AF_INET:
11166                 break;
11167 #endif
11168 #ifdef INET6
11169         case AF_INET6:
11170                 break;
11171 #endif
11172         default:
11173                 return;
11174         }
11175         sctp_alloc_a_chunk(stcb, chk);
11176         if (chk == NULL) {
11177                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11178                 return;
11179         }
11180         chk->copy_by_ref = 0;
11181         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11182         chk->rec.chunk_id.can_take_data = 1;
11183         chk->asoc = &stcb->asoc;
11184         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11185
11186         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11187         if (chk->data == NULL) {
11188                 sctp_free_a_chunk(stcb, chk, so_locked);
11189                 return;
11190         }
11191         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11192         SCTP_BUF_LEN(chk->data) = chk->send_size;
11193         chk->sent = SCTP_DATAGRAM_UNSENT;
11194         chk->snd_count = 0;
11195         chk->whoTo = net;
11196         atomic_add_int(&chk->whoTo->ref_count, 1);
11197         /* Now we have a mbuf that we can fill in with the details */
11198         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11199         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11200         /* fill out chunk header */
11201         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11202         hb->ch.chunk_flags = 0;
11203         hb->ch.chunk_length = htons(chk->send_size);
11204         /* Fill out hb parameter */
11205         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11206         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11207         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11208         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11209         /* Did our user request this one, put it in */
11210         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11211         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11212         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11213                 /*
11214                  * we only take from the entropy pool if the address is not
11215                  * confirmed.
11216                  */
11217                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11218                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11219         } else {
11220                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11221                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11222         }
11223         switch (net->ro._l_addr.sa.sa_family) {
11224 #ifdef INET
11225         case AF_INET:
11226                 memcpy(hb->heartbeat.hb_info.address,
11227                     &net->ro._l_addr.sin.sin_addr,
11228                     sizeof(net->ro._l_addr.sin.sin_addr));
11229                 break;
11230 #endif
11231 #ifdef INET6
11232         case AF_INET6:
11233                 memcpy(hb->heartbeat.hb_info.address,
11234                     &net->ro._l_addr.sin6.sin6_addr,
11235                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11236                 break;
11237 #endif
11238         default:
11239                 return;
11240                 break;
11241         }
11242         net->hb_responded = 0;
11243         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11244         stcb->asoc.ctrl_queue_cnt++;
11245         SCTP_STAT_INCR(sctps_sendheartbeat);
11246         return;
11247 }
11248
11249 void
11250 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11251     uint32_t high_tsn)
11252 {
11253         struct sctp_association *asoc;
11254         struct sctp_ecne_chunk *ecne;
11255         struct sctp_tmit_chunk *chk;
11256
11257         if (net == NULL) {
11258                 return;
11259         }
11260         asoc = &stcb->asoc;
11261         SCTP_TCB_LOCK_ASSERT(stcb);
11262         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11263                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11264                         /* found a previous ECN_ECHO update it if needed */
11265                         uint32_t cnt, ctsn;
11266
11267                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11268                         ctsn = ntohl(ecne->tsn);
11269                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11270                                 ecne->tsn = htonl(high_tsn);
11271                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11272                         }
11273                         cnt = ntohl(ecne->num_pkts_since_cwr);
11274                         cnt++;
11275                         ecne->num_pkts_since_cwr = htonl(cnt);
11276                         return;
11277                 }
11278         }
11279         /* nope could not find one to update so we must build one */
11280         sctp_alloc_a_chunk(stcb, chk);
11281         if (chk == NULL) {
11282                 return;
11283         }
11284         chk->copy_by_ref = 0;
11285         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11286         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11287         chk->rec.chunk_id.can_take_data = 0;
11288         chk->asoc = &stcb->asoc;
11289         chk->send_size = sizeof(struct sctp_ecne_chunk);
11290         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11291         if (chk->data == NULL) {
11292                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11293                 return;
11294         }
11295         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11296         SCTP_BUF_LEN(chk->data) = chk->send_size;
11297         chk->sent = SCTP_DATAGRAM_UNSENT;
11298         chk->snd_count = 0;
11299         chk->whoTo = net;
11300         atomic_add_int(&chk->whoTo->ref_count, 1);
11301
11302         stcb->asoc.ecn_echo_cnt_onq++;
11303         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11304         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11305         ecne->ch.chunk_flags = 0;
11306         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11307         ecne->tsn = htonl(high_tsn);
11308         ecne->num_pkts_since_cwr = htonl(1);
11309         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11310         asoc->ctrl_queue_cnt++;
11311 }
11312
11313 void
11314 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11315     struct mbuf *m, int len, int iphlen, int bad_crc)
11316 {
11317         struct sctp_association *asoc;
11318         struct sctp_pktdrop_chunk *drp;
11319         struct sctp_tmit_chunk *chk;
11320         uint8_t *datap;
11321         int was_trunc = 0;
11322         struct ip *iph;
11323         int fullsz = 0;
11324         long spc;
11325         int offset;
11326         struct sctp_chunkhdr *ch, chunk_buf;
11327         unsigned int chk_length;
11328
11329         if (!stcb) {
11330                 return;
11331         }
11332         asoc = &stcb->asoc;
11333         SCTP_TCB_LOCK_ASSERT(stcb);
11334         if (asoc->peer_supports_pktdrop == 0) {
11335                 /*-
11336                  * peer must declare support before I send one.
11337                  */
11338                 return;
11339         }
11340         if (stcb->sctp_socket == NULL) {
11341                 return;
11342         }
11343         sctp_alloc_a_chunk(stcb, chk);
11344         if (chk == NULL) {
11345                 return;
11346         }
11347         chk->copy_by_ref = 0;
11348         iph = mtod(m, struct ip *);
11349         if (iph == NULL) {
11350                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11351                 return;
11352         }
11353         len -= iphlen;
11354         chk->send_size = len;
11355         /* Validate that we do not have an ABORT in here. */
11356         offset = iphlen + sizeof(struct sctphdr);
11357         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11358             sizeof(*ch), (uint8_t *) & chunk_buf);
11359         while (ch != NULL) {
11360                 chk_length = ntohs(ch->chunk_length);
11361                 if (chk_length < sizeof(*ch)) {
11362                         /* break to abort land */
11363                         break;
11364                 }
11365                 switch (ch->chunk_type) {
11366                 case SCTP_PACKET_DROPPED:
11367                 case SCTP_ABORT_ASSOCIATION:
11368                 case SCTP_INITIATION_ACK:
11369                         /**
11370                          * We don't respond with an PKT-DROP to an ABORT
11371                          * or PKT-DROP. We also do not respond to an
11372                          * INIT-ACK, because we can't know if the initiation
11373                          * tag is correct or not.
11374                          */
11375                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11376                         return;
11377                 default:
11378                         break;
11379                 }
11380                 offset += SCTP_SIZE32(chk_length);
11381                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11382                     sizeof(*ch), (uint8_t *) & chunk_buf);
11383         }
11384
11385         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11386             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11387                 /*
11388                  * only send 1 mtu worth, trim off the excess on the end.
11389                  */
11390                 fullsz = len;
11391                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11392                 was_trunc = 1;
11393         }
11394         chk->asoc = &stcb->asoc;
11395         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11396         if (chk->data == NULL) {
11397 jump_out:
11398                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11399                 return;
11400         }
11401         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11402         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11403         if (drp == NULL) {
11404                 sctp_m_freem(chk->data);
11405                 chk->data = NULL;
11406                 goto jump_out;
11407         }
11408         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11409             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11410         chk->book_size_scale = 0;
11411         if (was_trunc) {
11412                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11413                 drp->trunc_len = htons(fullsz);
11414                 /*
11415                  * Len is already adjusted to size minus overhead above take
11416                  * out the pkt_drop chunk itself from it.
11417                  */
11418                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11419                 len = chk->send_size;
11420         } else {
11421                 /* no truncation needed */
11422                 drp->ch.chunk_flags = 0;
11423                 drp->trunc_len = htons(0);
11424         }
11425         if (bad_crc) {
11426                 drp->ch.chunk_flags |= SCTP_BADCRC;
11427         }
11428         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11429         SCTP_BUF_LEN(chk->data) = chk->send_size;
11430         chk->sent = SCTP_DATAGRAM_UNSENT;
11431         chk->snd_count = 0;
11432         if (net) {
11433                 /* we should hit here */
11434                 chk->whoTo = net;
11435                 atomic_add_int(&chk->whoTo->ref_count, 1);
11436         } else {
11437                 chk->whoTo = NULL;
11438         }
11439         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11440         chk->rec.chunk_id.can_take_data = 1;
11441         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11442         drp->ch.chunk_length = htons(chk->send_size);
11443         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11444         if (spc < 0) {
11445                 spc = 0;
11446         }
11447         drp->bottle_bw = htonl(spc);
11448         if (asoc->my_rwnd) {
11449                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11450                     asoc->size_on_all_streams +
11451                     asoc->my_rwnd_control_len +
11452                     stcb->sctp_socket->so_rcv.sb_cc);
11453         } else {
11454                 /*-
11455                  * If my rwnd is 0, possibly from mbuf depletion as well as
11456                  * space used, tell the peer there is NO space aka onq == bw
11457                  */
11458                 drp->current_onq = htonl(spc);
11459         }
11460         drp->reserved = 0;
11461         datap = drp->data;
11462         m_copydata(m, iphlen, len, (caddr_t)datap);
11463         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11464         asoc->ctrl_queue_cnt++;
11465 }
11466
11467 void
11468 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11469 {
11470         struct sctp_association *asoc;
11471         struct sctp_cwr_chunk *cwr;
11472         struct sctp_tmit_chunk *chk;
11473
11474         asoc = &stcb->asoc;
11475         SCTP_TCB_LOCK_ASSERT(stcb);
11476         if (net == NULL) {
11477                 return;
11478         }
11479         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11480                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11481                         /*
11482                          * found a previous CWR queued to same destination
11483                          * update it if needed
11484                          */
11485                         uint32_t ctsn;
11486
11487                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11488                         ctsn = ntohl(cwr->tsn);
11489                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11490                                 cwr->tsn = htonl(high_tsn);
11491                         }
11492                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11493                                 /* Make sure override is carried */
11494                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11495                         }
11496                         return;
11497                 }
11498         }
11499         sctp_alloc_a_chunk(stcb, chk);
11500         if (chk == NULL) {
11501                 return;
11502         }
11503         chk->copy_by_ref = 0;
11504         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11505         chk->rec.chunk_id.can_take_data = 1;
11506         chk->asoc = &stcb->asoc;
11507         chk->send_size = sizeof(struct sctp_cwr_chunk);
11508         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11509         if (chk->data == NULL) {
11510                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11511                 return;
11512         }
11513         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11514         SCTP_BUF_LEN(chk->data) = chk->send_size;
11515         chk->sent = SCTP_DATAGRAM_UNSENT;
11516         chk->snd_count = 0;
11517         chk->whoTo = net;
11518         atomic_add_int(&chk->whoTo->ref_count, 1);
11519         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11520         cwr->ch.chunk_type = SCTP_ECN_CWR;
11521         cwr->ch.chunk_flags = override;
11522         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11523         cwr->tsn = htonl(high_tsn);
11524         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11525         asoc->ctrl_queue_cnt++;
11526 }
11527
11528 void
11529 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11530     int number_entries, uint16_t * list,
11531     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11532 {
11533         int len, old_len, i;
11534         struct sctp_stream_reset_out_request *req_out;
11535         struct sctp_chunkhdr *ch;
11536
11537         ch = mtod(chk->data, struct sctp_chunkhdr *);
11538
11539
11540         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11541
11542         /* get to new offset for the param. */
11543         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11544         /* now how long will this param be? */
11545         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11546         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11547         req_out->ph.param_length = htons(len);
11548         req_out->request_seq = htonl(seq);
11549         req_out->response_seq = htonl(resp_seq);
11550         req_out->send_reset_at_tsn = htonl(last_sent);
11551         if (number_entries) {
11552                 for (i = 0; i < number_entries; i++) {
11553                         req_out->list_of_streams[i] = htons(list[i]);
11554                 }
11555         }
11556         if (SCTP_SIZE32(len) > len) {
11557                 /*-
11558                  * Need to worry about the pad we may end up adding to the
11559                  * end. This is easy since the struct is either aligned to 4
11560                  * bytes or 2 bytes off.
11561                  */
11562                 req_out->list_of_streams[number_entries] = 0;
11563         }
11564         /* now fix the chunk length */
11565         ch->chunk_length = htons(len + old_len);
11566         chk->book_size = len + old_len;
11567         chk->book_size_scale = 0;
11568         chk->send_size = SCTP_SIZE32(chk->book_size);
11569         SCTP_BUF_LEN(chk->data) = chk->send_size;
11570         return;
11571 }
11572
11573
11574 void
11575 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11576     int number_entries, uint16_t * list,
11577     uint32_t seq)
11578 {
11579         int len, old_len, i;
11580         struct sctp_stream_reset_in_request *req_in;
11581         struct sctp_chunkhdr *ch;
11582
11583         ch = mtod(chk->data, struct sctp_chunkhdr *);
11584
11585
11586         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11587
11588         /* get to new offset for the param. */
11589         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11590         /* now how long will this param be? */
11591         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11592         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11593         req_in->ph.param_length = htons(len);
11594         req_in->request_seq = htonl(seq);
11595         if (number_entries) {
11596                 for (i = 0; i < number_entries; i++) {
11597                         req_in->list_of_streams[i] = htons(list[i]);
11598                 }
11599         }
11600         if (SCTP_SIZE32(len) > len) {
11601                 /*-
11602                  * Need to worry about the pad we may end up adding to the
11603                  * end. This is easy since the struct is either aligned to 4
11604                  * bytes or 2 bytes off.
11605                  */
11606                 req_in->list_of_streams[number_entries] = 0;
11607         }
11608         /* now fix the chunk length */
11609         ch->chunk_length = htons(len + old_len);
11610         chk->book_size = len + old_len;
11611         chk->book_size_scale = 0;
11612         chk->send_size = SCTP_SIZE32(chk->book_size);
11613         SCTP_BUF_LEN(chk->data) = chk->send_size;
11614         return;
11615 }
11616
11617
11618 void
11619 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11620     uint32_t seq)
11621 {
11622         int len, old_len;
11623         struct sctp_stream_reset_tsn_request *req_tsn;
11624         struct sctp_chunkhdr *ch;
11625
11626         ch = mtod(chk->data, struct sctp_chunkhdr *);
11627
11628
11629         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11630
11631         /* get to new offset for the param. */
11632         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11633         /* now how long will this param be? */
11634         len = sizeof(struct sctp_stream_reset_tsn_request);
11635         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11636         req_tsn->ph.param_length = htons(len);
11637         req_tsn->request_seq = htonl(seq);
11638
11639         /* now fix the chunk length */
11640         ch->chunk_length = htons(len + old_len);
11641         chk->send_size = len + old_len;
11642         chk->book_size = SCTP_SIZE32(chk->send_size);
11643         chk->book_size_scale = 0;
11644         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11645         return;
11646 }
11647
11648 void
11649 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11650     uint32_t resp_seq, uint32_t result)
11651 {
11652         int len, old_len;
11653         struct sctp_stream_reset_response *resp;
11654         struct sctp_chunkhdr *ch;
11655
11656         ch = mtod(chk->data, struct sctp_chunkhdr *);
11657
11658
11659         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11660
11661         /* get to new offset for the param. */
11662         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11663         /* now how long will this param be? */
11664         len = sizeof(struct sctp_stream_reset_response);
11665         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11666         resp->ph.param_length = htons(len);
11667         resp->response_seq = htonl(resp_seq);
11668         resp->result = ntohl(result);
11669
11670         /* now fix the chunk length */
11671         ch->chunk_length = htons(len + old_len);
11672         chk->book_size = len + old_len;
11673         chk->book_size_scale = 0;
11674         chk->send_size = SCTP_SIZE32(chk->book_size);
11675         SCTP_BUF_LEN(chk->data) = chk->send_size;
11676         return;
11677
11678 }
11679
11680
11681 void
11682 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11683     uint32_t resp_seq, uint32_t result,
11684     uint32_t send_una, uint32_t recv_next)
11685 {
11686         int len, old_len;
11687         struct sctp_stream_reset_response_tsn *resp;
11688         struct sctp_chunkhdr *ch;
11689
11690         ch = mtod(chk->data, struct sctp_chunkhdr *);
11691
11692
11693         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11694
11695         /* get to new offset for the param. */
11696         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11697         /* now how long will this param be? */
11698         len = sizeof(struct sctp_stream_reset_response_tsn);
11699         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11700         resp->ph.param_length = htons(len);
11701         resp->response_seq = htonl(resp_seq);
11702         resp->result = htonl(result);
11703         resp->senders_next_tsn = htonl(send_una);
11704         resp->receivers_next_tsn = htonl(recv_next);
11705
11706         /* now fix the chunk length */
11707         ch->chunk_length = htons(len + old_len);
11708         chk->book_size = len + old_len;
11709         chk->send_size = SCTP_SIZE32(chk->book_size);
11710         chk->book_size_scale = 0;
11711         SCTP_BUF_LEN(chk->data) = chk->send_size;
11712         return;
11713 }
11714
11715 static void
11716 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11717     uint32_t seq,
11718     uint16_t adding)
11719 {
11720         int len, old_len;
11721         struct sctp_chunkhdr *ch;
11722         struct sctp_stream_reset_add_strm *addstr;
11723
11724         ch = mtod(chk->data, struct sctp_chunkhdr *);
11725         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11726
11727         /* get to new offset for the param. */
11728         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11729         /* now how long will this param be? */
11730         len = sizeof(struct sctp_stream_reset_add_strm);
11731
11732         /* Fill it out. */
11733         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11734         addstr->ph.param_length = htons(len);
11735         addstr->request_seq = htonl(seq);
11736         addstr->number_of_streams = htons(adding);
11737         addstr->reserved = 0;
11738
11739         /* now fix the chunk length */
11740         ch->chunk_length = htons(len + old_len);
11741         chk->send_size = len + old_len;
11742         chk->book_size = SCTP_SIZE32(chk->send_size);
11743         chk->book_size_scale = 0;
11744         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11745         return;
11746 }
11747
11748 static void
11749 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11750     uint32_t seq,
11751     uint16_t adding)
11752 {
11753         int len, old_len;
11754         struct sctp_chunkhdr *ch;
11755         struct sctp_stream_reset_add_strm *addstr;
11756
11757         ch = mtod(chk->data, struct sctp_chunkhdr *);
11758         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11759
11760         /* get to new offset for the param. */
11761         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11762         /* now how long will this param be? */
11763         len = sizeof(struct sctp_stream_reset_add_strm);
11764         /* Fill it out. */
11765         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11766         addstr->ph.param_length = htons(len);
11767         addstr->request_seq = htonl(seq);
11768         addstr->number_of_streams = htons(adding);
11769         addstr->reserved = 0;
11770
11771         /* now fix the chunk length */
11772         ch->chunk_length = htons(len + old_len);
11773         chk->send_size = len + old_len;
11774         chk->book_size = SCTP_SIZE32(chk->send_size);
11775         chk->book_size_scale = 0;
11776         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11777         return;
11778 }
11779
11780
11781
11782 int
11783 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11784     int number_entries, uint16_t * list,
11785     uint8_t send_out_req,
11786     uint8_t send_in_req,
11787     uint8_t send_tsn_req,
11788     uint8_t add_stream,
11789     uint16_t adding_o,
11790     uint16_t adding_i, uint8_t peer_asked
11791 )
11792 {
11793
11794         struct sctp_association *asoc;
11795         struct sctp_tmit_chunk *chk;
11796         struct sctp_chunkhdr *ch;
11797         uint32_t seq;
11798
11799         asoc = &stcb->asoc;
11800         if (asoc->stream_reset_outstanding) {
11801                 /*-
11802                  * Already one pending, must get ACK back to clear the flag.
11803                  */
11804                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11805                 return (EBUSY);
11806         }
11807         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11808             (add_stream == 0)) {
11809                 /* nothing to do */
11810                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11811                 return (EINVAL);
11812         }
11813         if (send_tsn_req && (send_out_req || send_in_req)) {
11814                 /* error, can't do that */
11815                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11816                 return (EINVAL);
11817         }
11818         sctp_alloc_a_chunk(stcb, chk);
11819         if (chk == NULL) {
11820                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11821                 return (ENOMEM);
11822         }
11823         chk->copy_by_ref = 0;
11824         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11825         chk->rec.chunk_id.can_take_data = 0;
11826         chk->asoc = &stcb->asoc;
11827         chk->book_size = sizeof(struct sctp_chunkhdr);
11828         chk->send_size = SCTP_SIZE32(chk->book_size);
11829         chk->book_size_scale = 0;
11830
11831         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11832         if (chk->data == NULL) {
11833                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11834                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11835                 return (ENOMEM);
11836         }
11837         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11838
11839         /* setup chunk parameters */
11840         chk->sent = SCTP_DATAGRAM_UNSENT;
11841         chk->snd_count = 0;
11842         if (stcb->asoc.alternate) {
11843                 chk->whoTo = stcb->asoc.alternate;
11844         } else {
11845                 chk->whoTo = stcb->asoc.primary_destination;
11846         }
11847         atomic_add_int(&chk->whoTo->ref_count, 1);
11848         ch = mtod(chk->data, struct sctp_chunkhdr *);
11849         ch->chunk_type = SCTP_STREAM_RESET;
11850         ch->chunk_flags = 0;
11851         ch->chunk_length = htons(chk->book_size);
11852         SCTP_BUF_LEN(chk->data) = chk->send_size;
11853
11854         seq = stcb->asoc.str_reset_seq_out;
11855         if (send_out_req) {
11856                 sctp_add_stream_reset_out(chk, number_entries, list,
11857                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11858                 asoc->stream_reset_out_is_outstanding = 1;
11859                 seq++;
11860                 asoc->stream_reset_outstanding++;
11861         }
11862         if ((add_stream & 1) &&
11863             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11864                 /* Need to allocate more */
11865                 struct sctp_stream_out *oldstream;
11866                 struct sctp_stream_queue_pending *sp, *nsp;
11867                 int i;
11868
11869                 oldstream = stcb->asoc.strmout;
11870                 /* get some more */
11871                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11872                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11873                     SCTP_M_STRMO);
11874                 if (stcb->asoc.strmout == NULL) {
11875                         uint8_t x;
11876
11877                         stcb->asoc.strmout = oldstream;
11878                         /* Turn off the bit */
11879                         x = add_stream & 0xfe;
11880                         add_stream = x;
11881                         goto skip_stuff;
11882                 }
11883                 /*
11884                  * Ok now we proceed with copying the old out stuff and
11885                  * initializing the new stuff.
11886                  */
11887                 SCTP_TCB_SEND_LOCK(stcb);
11888                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11889                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11890                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11891                         stcb->asoc.strmout[i].next_sequence_sent = oldstream[i].next_sequence_sent;
11892                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11893                         stcb->asoc.strmout[i].stream_no = i;
11894                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11895                         /* now anything on those queues? */
11896                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11897                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11898                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11899                         }
11900                         /* Now move assoc pointers too */
11901                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11902                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11903                         }
11904                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11905                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11906                         }
11907                 }
11908                 /* now the new streams */
11909                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11910                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11911                         stcb->asoc.strmout[i].next_sequence_sent = 0x0;
11912                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11913                         stcb->asoc.strmout[i].stream_no = i;
11914                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11915                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11916                 }
11917                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11918                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11919                 SCTP_TCB_SEND_UNLOCK(stcb);
11920         }
11921 skip_stuff:
11922         if ((add_stream & 1) && (adding_o > 0)) {
11923                 asoc->strm_pending_add_size = adding_o;
11924                 asoc->peer_req_out = peer_asked;
11925                 sctp_add_an_out_stream(chk, seq, adding_o);
11926                 seq++;
11927                 asoc->stream_reset_outstanding++;
11928         }
11929         if ((add_stream & 2) && (adding_i > 0)) {
11930                 sctp_add_an_in_stream(chk, seq, adding_i);
11931                 seq++;
11932                 asoc->stream_reset_outstanding++;
11933         }
11934         if (send_in_req) {
11935                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11936                 seq++;
11937                 asoc->stream_reset_outstanding++;
11938         }
11939         if (send_tsn_req) {
11940                 sctp_add_stream_reset_tsn(chk, seq);
11941                 asoc->stream_reset_outstanding++;
11942         }
11943         asoc->str_reset = chk;
11944         /* insert the chunk for sending */
11945         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11946             chk,
11947             sctp_next);
11948         asoc->ctrl_queue_cnt++;
11949         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11950         return (0);
11951 }
11952
11953 void
11954 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11955     struct mbuf *cause,
11956     uint8_t use_mflowid, uint32_t mflowid,
11957     uint32_t vrf_id, uint16_t port)
11958 {
11959         /* Don't respond to an ABORT with an ABORT. */
11960         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11961                 if (cause)
11962                         sctp_m_freem(cause);
11963                 return;
11964         }
11965         sctp_send_resp_msg(m, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11966             use_mflowid, mflowid,
11967             vrf_id, port);
11968         return;
11969 }
11970
11971 void
11972 sctp_send_operr_to(struct mbuf *m, struct sctphdr *sh, uint32_t vtag,
11973     struct mbuf *cause,
11974     uint8_t use_mflowid, uint32_t mflowid,
11975     uint32_t vrf_id, uint16_t port)
11976 {
11977         sctp_send_resp_msg(m, sh, vtag, SCTP_OPERATION_ERROR, cause,
11978             use_mflowid, mflowid,
11979             vrf_id, port);
11980         return;
11981 }
11982
11983 static struct mbuf *
11984 sctp_copy_resume(struct uio *uio,
11985     int max_send_len,
11986     int user_marks_eor,
11987     int *error,
11988     uint32_t * sndout,
11989     struct mbuf **new_tail)
11990 {
11991         struct mbuf *m;
11992
11993         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11994             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11995         if (m == NULL) {
11996                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11997                 *error = ENOMEM;
11998         } else {
11999                 *sndout = m_length(m, NULL);
12000                 *new_tail = m_last(m);
12001         }
12002         return (m);
12003 }
12004
12005 static int
12006 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12007     struct uio *uio,
12008     int resv_upfront)
12009 {
12010         int left;
12011
12012         left = sp->length;
12013         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12014             resv_upfront, 0);
12015         if (sp->data == NULL) {
12016                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12017                 return (ENOMEM);
12018         }
12019         sp->tail_mbuf = m_last(sp->data);
12020         return (0);
12021 }
12022
12023
12024
12025 static struct sctp_stream_queue_pending *
12026 sctp_copy_it_in(struct sctp_tcb *stcb,
12027     struct sctp_association *asoc,
12028     struct sctp_sndrcvinfo *srcv,
12029     struct uio *uio,
12030     struct sctp_nets *net,
12031     int max_send_len,
12032     int user_marks_eor,
12033     int *error)
12034 {
12035         /*-
12036          * This routine must be very careful in its work. Protocol
12037          * processing is up and running so care must be taken to spl...()
12038          * when you need to do something that may effect the stcb/asoc. The
12039          * sb is locked however. When data is copied the protocol processing
12040          * should be enabled since this is a slower operation...
12041          */
12042         struct sctp_stream_queue_pending *sp = NULL;
12043         int resv_in_first;
12044
12045         *error = 0;
12046         /* Now can we send this? */
12047         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12048             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12049             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12050             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12051                 /* got data while shutting down */
12052                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12053                 *error = ECONNRESET;
12054                 goto out_now;
12055         }
12056         sctp_alloc_a_strmoq(stcb, sp);
12057         if (sp == NULL) {
12058                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12059                 *error = ENOMEM;
12060                 goto out_now;
12061         }
12062         sp->act_flags = 0;
12063         sp->sender_all_done = 0;
12064         sp->sinfo_flags = srcv->sinfo_flags;
12065         sp->timetolive = srcv->sinfo_timetolive;
12066         sp->ppid = srcv->sinfo_ppid;
12067         sp->context = srcv->sinfo_context;
12068         sp->strseq = 0;
12069         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12070
12071         sp->stream = srcv->sinfo_stream;
12072         sp->length = min(uio->uio_resid, max_send_len);
12073         if ((sp->length == (uint32_t) uio->uio_resid) &&
12074             ((user_marks_eor == 0) ||
12075             (srcv->sinfo_flags & SCTP_EOF) ||
12076             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12077                 sp->msg_is_complete = 1;
12078         } else {
12079                 sp->msg_is_complete = 0;
12080         }
12081         sp->sender_all_done = 0;
12082         sp->some_taken = 0;
12083         sp->put_last_out = 0;
12084         resv_in_first = sizeof(struct sctp_data_chunk);
12085         sp->data = sp->tail_mbuf = NULL;
12086         if (sp->length == 0) {
12087                 *error = 0;
12088                 goto skip_copy;
12089         }
12090         if (srcv->sinfo_keynumber_valid) {
12091                 sp->auth_keyid = srcv->sinfo_keynumber;
12092         } else {
12093                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12094         }
12095         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12096                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12097                 sp->holds_key_ref = 1;
12098         }
12099         *error = sctp_copy_one(sp, uio, resv_in_first);
12100 skip_copy:
12101         if (*error) {
12102                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12103                 sp = NULL;
12104         } else {
12105                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12106                         sp->net = net;
12107                         atomic_add_int(&sp->net->ref_count, 1);
12108                 } else {
12109                         sp->net = NULL;
12110                 }
12111                 sctp_set_prsctp_policy(sp);
12112         }
12113 out_now:
12114         return (sp);
12115 }
12116
12117
12118 int
12119 sctp_sosend(struct socket *so,
12120     struct sockaddr *addr,
12121     struct uio *uio,
12122     struct mbuf *top,
12123     struct mbuf *control,
12124     int flags,
12125     struct thread *p
12126 )
12127 {
12128         int error, use_sndinfo = 0;
12129         struct sctp_sndrcvinfo sndrcvninfo;
12130         struct sockaddr *addr_to_use;
12131
12132 #if defined(INET) && defined(INET6)
12133         struct sockaddr_in sin;
12134
12135 #endif
12136
12137         if (control) {
12138                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12139                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12140                     sizeof(sndrcvninfo))) {
12141                         /* got one */
12142                         use_sndinfo = 1;
12143                 }
12144         }
12145         addr_to_use = addr;
12146 #if defined(INET) && defined(INET6)
12147         if ((addr) && (addr->sa_family == AF_INET6)) {
12148                 struct sockaddr_in6 *sin6;
12149
12150                 sin6 = (struct sockaddr_in6 *)addr;
12151                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12152                         in6_sin6_2_sin(&sin, sin6);
12153                         addr_to_use = (struct sockaddr *)&sin;
12154                 }
12155         }
12156 #endif
12157         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12158             control,
12159             flags,
12160             use_sndinfo ? &sndrcvninfo : NULL
12161             ,p
12162             );
12163         return (error);
12164 }
12165
12166
12167 int
12168 sctp_lower_sosend(struct socket *so,
12169     struct sockaddr *addr,
12170     struct uio *uio,
12171     struct mbuf *i_pak,
12172     struct mbuf *control,
12173     int flags,
12174     struct sctp_sndrcvinfo *srcv
12175     ,
12176     struct thread *p
12177 )
12178 {
12179         unsigned int sndlen = 0, max_len;
12180         int error, len;
12181         struct mbuf *top = NULL;
12182         int queue_only = 0, queue_only_for_init = 0;
12183         int free_cnt_applied = 0;
12184         int un_sent;
12185         int now_filled = 0;
12186         unsigned int inqueue_bytes = 0;
12187         struct sctp_block_entry be;
12188         struct sctp_inpcb *inp;
12189         struct sctp_tcb *stcb = NULL;
12190         struct timeval now;
12191         struct sctp_nets *net;
12192         struct sctp_association *asoc;
12193         struct sctp_inpcb *t_inp;
12194         int user_marks_eor;
12195         int create_lock_applied = 0;
12196         int nagle_applies = 0;
12197         int some_on_control = 0;
12198         int got_all_of_the_send = 0;
12199         int hold_tcblock = 0;
12200         int non_blocking = 0;
12201         uint32_t local_add_more, local_soresv = 0;
12202         uint16_t port;
12203         uint16_t sinfo_flags;
12204         sctp_assoc_t sinfo_assoc_id;
12205
12206         error = 0;
12207         net = NULL;
12208         stcb = NULL;
12209         asoc = NULL;
12210
12211         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12212         if (inp == NULL) {
12213                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12214                 error = EINVAL;
12215                 if (i_pak) {
12216                         SCTP_RELEASE_PKT(i_pak);
12217                 }
12218                 return (error);
12219         }
12220         if ((uio == NULL) && (i_pak == NULL)) {
12221                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12222                 return (EINVAL);
12223         }
12224         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12225         atomic_add_int(&inp->total_sends, 1);
12226         if (uio) {
12227                 if (uio->uio_resid < 0) {
12228                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12229                         return (EINVAL);
12230                 }
12231                 sndlen = uio->uio_resid;
12232         } else {
12233                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12234                 sndlen = SCTP_HEADER_LEN(i_pak);
12235         }
12236         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12237             addr,
12238             sndlen);
12239         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12240             (inp->sctp_socket->so_qlimit)) {
12241                 /* The listener can NOT send */
12242                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12243                 error = ENOTCONN;
12244                 goto out_unlocked;
12245         }
12246         /**
12247          * Pre-screen address, if one is given the sin-len
12248          * must be set correctly!
12249          */
12250         if (addr) {
12251                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12252
12253                 switch (raddr->sa.sa_family) {
12254 #if defined(INET)
12255                 case AF_INET:
12256                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12257                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12258                                 error = EINVAL;
12259                                 goto out_unlocked;
12260                         }
12261                         port = raddr->sin.sin_port;
12262                         break;
12263 #endif
12264 #if defined(INET6)
12265                 case AF_INET6:
12266                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12267                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12268                                 error = EINVAL;
12269                                 goto out_unlocked;
12270                         }
12271                         port = raddr->sin6.sin6_port;
12272                         break;
12273 #endif
12274                 default:
12275                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12276                         error = EAFNOSUPPORT;
12277                         goto out_unlocked;
12278                 }
12279         } else
12280                 port = 0;
12281
12282         if (srcv) {
12283                 sinfo_flags = srcv->sinfo_flags;
12284                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12285                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12286                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12287                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12288                         error = EINVAL;
12289                         goto out_unlocked;
12290                 }
12291                 if (srcv->sinfo_flags)
12292                         SCTP_STAT_INCR(sctps_sends_with_flags);
12293         } else {
12294                 sinfo_flags = inp->def_send.sinfo_flags;
12295                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12296         }
12297         if (sinfo_flags & SCTP_SENDALL) {
12298                 /* its a sendall */
12299                 error = sctp_sendall(inp, uio, top, srcv);
12300                 top = NULL;
12301                 goto out_unlocked;
12302         }
12303         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12304                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12305                 error = EINVAL;
12306                 goto out_unlocked;
12307         }
12308         /* now we must find the assoc */
12309         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12310             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12311                 SCTP_INP_RLOCK(inp);
12312                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12313                 if (stcb) {
12314                         SCTP_TCB_LOCK(stcb);
12315                         hold_tcblock = 1;
12316                 }
12317                 SCTP_INP_RUNLOCK(inp);
12318         } else if (sinfo_assoc_id) {
12319                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12320         } else if (addr) {
12321                 /*-
12322                  * Since we did not use findep we must
12323                  * increment it, and if we don't find a tcb
12324                  * decrement it.
12325                  */
12326                 SCTP_INP_WLOCK(inp);
12327                 SCTP_INP_INCR_REF(inp);
12328                 SCTP_INP_WUNLOCK(inp);
12329                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12330                 if (stcb == NULL) {
12331                         SCTP_INP_WLOCK(inp);
12332                         SCTP_INP_DECR_REF(inp);
12333                         SCTP_INP_WUNLOCK(inp);
12334                 } else {
12335                         hold_tcblock = 1;
12336                 }
12337         }
12338         if ((stcb == NULL) && (addr)) {
12339                 /* Possible implicit send? */
12340                 SCTP_ASOC_CREATE_LOCK(inp);
12341                 create_lock_applied = 1;
12342                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12343                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12344                         /* Should I really unlock ? */
12345                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12346                         error = EINVAL;
12347                         goto out_unlocked;
12348
12349                 }
12350                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12351                     (addr->sa_family == AF_INET6)) {
12352                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12353                         error = EINVAL;
12354                         goto out_unlocked;
12355                 }
12356                 SCTP_INP_WLOCK(inp);
12357                 SCTP_INP_INCR_REF(inp);
12358                 SCTP_INP_WUNLOCK(inp);
12359                 /* With the lock applied look again */
12360                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12361                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12362                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12363                 }
12364                 if (stcb == NULL) {
12365                         SCTP_INP_WLOCK(inp);
12366                         SCTP_INP_DECR_REF(inp);
12367                         SCTP_INP_WUNLOCK(inp);
12368                 } else {
12369                         hold_tcblock = 1;
12370                 }
12371                 if (error) {
12372                         goto out_unlocked;
12373                 }
12374                 if (t_inp != inp) {
12375                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12376                         error = ENOTCONN;
12377                         goto out_unlocked;
12378                 }
12379         }
12380         if (stcb == NULL) {
12381                 if (addr == NULL) {
12382                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12383                         error = ENOENT;
12384                         goto out_unlocked;
12385                 } else {
12386                         /* We must go ahead and start the INIT process */
12387                         uint32_t vrf_id;
12388
12389                         if ((sinfo_flags & SCTP_ABORT) ||
12390                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12391                                 /*-
12392                                  * User asks to abort a non-existant assoc,
12393                                  * or EOF a non-existant assoc with no data
12394                                  */
12395                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12396                                 error = ENOENT;
12397                                 goto out_unlocked;
12398                         }
12399                         /* get an asoc/stcb struct */
12400                         vrf_id = inp->def_vrf_id;
12401 #ifdef INVARIANTS
12402                         if (create_lock_applied == 0) {
12403                                 panic("Error, should hold create lock and I don't?");
12404                         }
12405 #endif
12406                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12407                             p
12408                             );
12409                         if (stcb == NULL) {
12410                                 /* Error is setup for us in the call */
12411                                 goto out_unlocked;
12412                         }
12413                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12414                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12415                                 /*
12416                                  * Set the connected flag so we can queue
12417                                  * data
12418                                  */
12419                                 soisconnecting(so);
12420                         }
12421                         hold_tcblock = 1;
12422                         if (create_lock_applied) {
12423                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12424                                 create_lock_applied = 0;
12425                         } else {
12426                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12427                         }
12428                         /*
12429                          * Turn on queue only flag to prevent data from
12430                          * being sent
12431                          */
12432                         queue_only = 1;
12433                         asoc = &stcb->asoc;
12434                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12435                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12436
12437                         /* initialize authentication params for the assoc */
12438                         sctp_initialize_auth_params(inp, stcb);
12439
12440                         if (control) {
12441                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12442                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12443                                         hold_tcblock = 0;
12444                                         stcb = NULL;
12445                                         goto out_unlocked;
12446                                 }
12447                         }
12448                         /* out with the INIT */
12449                         queue_only_for_init = 1;
12450                         /*-
12451                          * we may want to dig in after this call and adjust the MTU
12452                          * value. It defaulted to 1500 (constant) but the ro
12453                          * structure may now have an update and thus we may need to
12454                          * change it BEFORE we append the message.
12455                          */
12456                 }
12457         } else
12458                 asoc = &stcb->asoc;
12459         if (srcv == NULL)
12460                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12461         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12462                 if (addr)
12463                         net = sctp_findnet(stcb, addr);
12464                 else
12465                         net = NULL;
12466                 if ((net == NULL) ||
12467                     ((port != 0) && (port != stcb->rport))) {
12468                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12469                         error = EINVAL;
12470                         goto out_unlocked;
12471                 }
12472         } else {
12473                 if (stcb->asoc.alternate) {
12474                         net = stcb->asoc.alternate;
12475                 } else {
12476                         net = stcb->asoc.primary_destination;
12477                 }
12478         }
12479         atomic_add_int(&stcb->total_sends, 1);
12480         /* Keep the stcb from being freed under our feet */
12481         atomic_add_int(&asoc->refcnt, 1);
12482         free_cnt_applied = 1;
12483
12484         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12485                 if (sndlen > asoc->smallest_mtu) {
12486                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12487                         error = EMSGSIZE;
12488                         goto out_unlocked;
12489                 }
12490         }
12491         if (SCTP_SO_IS_NBIO(so)
12492             || (flags & MSG_NBIO)
12493             ) {
12494                 non_blocking = 1;
12495         }
12496         /* would we block? */
12497         if (non_blocking) {
12498                 if (hold_tcblock == 0) {
12499                         SCTP_TCB_LOCK(stcb);
12500                         hold_tcblock = 1;
12501                 }
12502                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12503                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12504                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12505                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12506                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12507                                 error = EMSGSIZE;
12508                         else
12509                                 error = EWOULDBLOCK;
12510                         goto out_unlocked;
12511                 }
12512                 stcb->asoc.sb_send_resv += sndlen;
12513                 SCTP_TCB_UNLOCK(stcb);
12514                 hold_tcblock = 0;
12515         } else {
12516                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12517         }
12518         local_soresv = sndlen;
12519         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12520                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12521                 error = ECONNRESET;
12522                 goto out_unlocked;
12523         }
12524         if (create_lock_applied) {
12525                 SCTP_ASOC_CREATE_UNLOCK(inp);
12526                 create_lock_applied = 0;
12527         }
12528         if (asoc->stream_reset_outstanding) {
12529                 /*
12530                  * Can't queue any data while stream reset is underway.
12531                  */
12532                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12533                 error = EAGAIN;
12534                 goto out_unlocked;
12535         }
12536         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12537             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12538                 queue_only = 1;
12539         }
12540         /* we are now done with all control */
12541         if (control) {
12542                 sctp_m_freem(control);
12543                 control = NULL;
12544         }
12545         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12546             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12547             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12548             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12549                 if (srcv->sinfo_flags & SCTP_ABORT) {
12550                         ;
12551                 } else {
12552                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12553                         error = ECONNRESET;
12554                         goto out_unlocked;
12555                 }
12556         }
12557         /* Ok, we will attempt a msgsnd :> */
12558         if (p) {
12559                 p->td_ru.ru_msgsnd++;
12560         }
12561         /* Are we aborting? */
12562         if (srcv->sinfo_flags & SCTP_ABORT) {
12563                 struct mbuf *mm;
12564                 int tot_demand, tot_out = 0, max_out;
12565
12566                 SCTP_STAT_INCR(sctps_sends_with_abort);
12567                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12568                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12569                         /* It has to be up before we abort */
12570                         /* how big is the user initiated abort? */
12571                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12572                         error = EINVAL;
12573                         goto out;
12574                 }
12575                 if (hold_tcblock) {
12576                         SCTP_TCB_UNLOCK(stcb);
12577                         hold_tcblock = 0;
12578                 }
12579                 if (top) {
12580                         struct mbuf *cntm = NULL;
12581
12582                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12583                         if (sndlen != 0) {
12584                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12585                                         tot_out += SCTP_BUF_LEN(cntm);
12586                                 }
12587                         }
12588                 } else {
12589                         /* Must fit in a MTU */
12590                         tot_out = sndlen;
12591                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12592                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12593                                 /* To big */
12594                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12595                                 error = EMSGSIZE;
12596                                 goto out;
12597                         }
12598                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12599                 }
12600                 if (mm == NULL) {
12601                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12602                         error = ENOMEM;
12603                         goto out;
12604                 }
12605                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12606                 max_out -= sizeof(struct sctp_abort_msg);
12607                 if (tot_out > max_out) {
12608                         tot_out = max_out;
12609                 }
12610                 if (mm) {
12611                         struct sctp_paramhdr *ph;
12612
12613                         /* now move forward the data pointer */
12614                         ph = mtod(mm, struct sctp_paramhdr *);
12615                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12616                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12617                         ph++;
12618                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12619                         if (top == NULL) {
12620                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12621                                 if (error) {
12622                                         /*-
12623                                          * Here if we can't get his data we
12624                                          * still abort we just don't get to
12625                                          * send the users note :-0
12626                                          */
12627                                         sctp_m_freem(mm);
12628                                         mm = NULL;
12629                                 }
12630                         } else {
12631                                 if (sndlen != 0) {
12632                                         SCTP_BUF_NEXT(mm) = top;
12633                                 }
12634                         }
12635                 }
12636                 if (hold_tcblock == 0) {
12637                         SCTP_TCB_LOCK(stcb);
12638                 }
12639                 atomic_add_int(&stcb->asoc.refcnt, -1);
12640                 free_cnt_applied = 0;
12641                 /* release this lock, otherwise we hang on ourselves */
12642                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12643                 /* now relock the stcb so everything is sane */
12644                 hold_tcblock = 0;
12645                 stcb = NULL;
12646                 /*
12647                  * In this case top is already chained to mm avoid double
12648                  * free, since we free it below if top != NULL and driver
12649                  * would free it after sending the packet out
12650                  */
12651                 if (sndlen != 0) {
12652                         top = NULL;
12653                 }
12654                 goto out_unlocked;
12655         }
12656         /* Calculate the maximum we can send */
12657         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12658         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12659                 if (non_blocking) {
12660                         /* we already checked for non-blocking above. */
12661                         max_len = sndlen;
12662                 } else {
12663                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12664                 }
12665         } else {
12666                 max_len = 0;
12667         }
12668         if (hold_tcblock) {
12669                 SCTP_TCB_UNLOCK(stcb);
12670                 hold_tcblock = 0;
12671         }
12672         /* Is the stream no. valid? */
12673         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12674                 /* Invalid stream number */
12675                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12676                 error = EINVAL;
12677                 goto out_unlocked;
12678         }
12679         if (asoc->strmout == NULL) {
12680                 /* huh? software error */
12681                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12682                 error = EFAULT;
12683                 goto out_unlocked;
12684         }
12685         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12686         if ((user_marks_eor == 0) &&
12687             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12688                 /* It will NEVER fit */
12689                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12690                 error = EMSGSIZE;
12691                 goto out_unlocked;
12692         }
12693         if ((uio == NULL) && user_marks_eor) {
12694                 /*-
12695                  * We do not support eeor mode for
12696                  * sending with mbuf chains (like sendfile).
12697                  */
12698                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12699                 error = EINVAL;
12700                 goto out_unlocked;
12701         }
12702         if (user_marks_eor) {
12703                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12704         } else {
12705                 /*-
12706                  * For non-eeor the whole message must fit in
12707                  * the socket send buffer.
12708                  */
12709                 local_add_more = sndlen;
12710         }
12711         len = 0;
12712         if (non_blocking) {
12713                 goto skip_preblock;
12714         }
12715         if (((max_len <= local_add_more) &&
12716             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12717             (max_len == 0) ||
12718             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12719                 /* No room right now ! */
12720                 SOCKBUF_LOCK(&so->so_snd);
12721                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12722                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12723                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12724                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12725                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12726                             inqueue_bytes,
12727                             local_add_more,
12728                             stcb->asoc.stream_queue_cnt,
12729                             stcb->asoc.chunks_on_out_queue,
12730                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12731                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12732                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12733                         }
12734                         be.error = 0;
12735                         stcb->block_entry = &be;
12736                         error = sbwait(&so->so_snd);
12737                         stcb->block_entry = NULL;
12738                         if (error || so->so_error || be.error) {
12739                                 if (error == 0) {
12740                                         if (so->so_error)
12741                                                 error = so->so_error;
12742                                         if (be.error) {
12743                                                 error = be.error;
12744                                         }
12745                                 }
12746                                 SOCKBUF_UNLOCK(&so->so_snd);
12747                                 goto out_unlocked;
12748                         }
12749                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12750                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12751                                     asoc, stcb->asoc.total_output_queue_size);
12752                         }
12753                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12754                                 goto out_unlocked;
12755                         }
12756                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12757                 }
12758                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12759                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12760                 } else {
12761                         max_len = 0;
12762                 }
12763                 SOCKBUF_UNLOCK(&so->so_snd);
12764         }
12765 skip_preblock:
12766         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12767                 goto out_unlocked;
12768         }
12769         /*
12770          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12771          * case NOTE: uio will be null when top/mbuf is passed
12772          */
12773         if (sndlen == 0) {
12774                 if (srcv->sinfo_flags & SCTP_EOF) {
12775                         got_all_of_the_send = 1;
12776                         goto dataless_eof;
12777                 } else {
12778                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12779                         error = EINVAL;
12780                         goto out;
12781                 }
12782         }
12783         if (top == NULL) {
12784                 struct sctp_stream_queue_pending *sp;
12785                 struct sctp_stream_out *strm;
12786                 uint32_t sndout;
12787
12788                 SCTP_TCB_SEND_LOCK(stcb);
12789                 if ((asoc->stream_locked) &&
12790                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12791                         SCTP_TCB_SEND_UNLOCK(stcb);
12792                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12793                         error = EINVAL;
12794                         goto out;
12795                 }
12796                 SCTP_TCB_SEND_UNLOCK(stcb);
12797
12798                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12799                 if (strm->last_msg_incomplete == 0) {
12800         do_a_copy_in:
12801                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12802                         if ((sp == NULL) || (error)) {
12803                                 goto out;
12804                         }
12805                         SCTP_TCB_SEND_LOCK(stcb);
12806                         if (sp->msg_is_complete) {
12807                                 strm->last_msg_incomplete = 0;
12808                                 asoc->stream_locked = 0;
12809                         } else {
12810                                 /*
12811                                  * Just got locked to this guy in case of an
12812                                  * interrupt.
12813                                  */
12814                                 strm->last_msg_incomplete = 1;
12815                                 asoc->stream_locked = 1;
12816                                 asoc->stream_locked_on = srcv->sinfo_stream;
12817                                 sp->sender_all_done = 0;
12818                         }
12819                         sctp_snd_sb_alloc(stcb, sp->length);
12820                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12821                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12822                                 sp->strseq = strm->next_sequence_sent;
12823                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12824                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12825                                             (uintptr_t) stcb, sp->length,
12826                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12827                                 }
12828                                 strm->next_sequence_sent++;
12829                         } else {
12830                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12831                         }
12832                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12833                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12834                         SCTP_TCB_SEND_UNLOCK(stcb);
12835                 } else {
12836                         SCTP_TCB_SEND_LOCK(stcb);
12837                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12838                         SCTP_TCB_SEND_UNLOCK(stcb);
12839                         if (sp == NULL) {
12840                                 /* ???? Huh ??? last msg is gone */
12841 #ifdef INVARIANTS
12842                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12843 #else
12844                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12845                                 strm->last_msg_incomplete = 0;
12846 #endif
12847                                 goto do_a_copy_in;
12848
12849                         }
12850                 }
12851                 while (uio->uio_resid > 0) {
12852                         /* How much room do we have? */
12853                         struct mbuf *new_tail, *mm;
12854
12855                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12856                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12857                         else
12858                                 max_len = 0;
12859
12860                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12861                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12862                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12863                                 sndout = 0;
12864                                 new_tail = NULL;
12865                                 if (hold_tcblock) {
12866                                         SCTP_TCB_UNLOCK(stcb);
12867                                         hold_tcblock = 0;
12868                                 }
12869                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12870                                 if ((mm == NULL) || error) {
12871                                         if (mm) {
12872                                                 sctp_m_freem(mm);
12873                                         }
12874                                         goto out;
12875                                 }
12876                                 /* Update the mbuf and count */
12877                                 SCTP_TCB_SEND_LOCK(stcb);
12878                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12879                                         /*
12880                                          * we need to get out. Peer probably
12881                                          * aborted.
12882                                          */
12883                                         sctp_m_freem(mm);
12884                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12885                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12886                                                 error = ECONNRESET;
12887                                         }
12888                                         SCTP_TCB_SEND_UNLOCK(stcb);
12889                                         goto out;
12890                                 }
12891                                 if (sp->tail_mbuf) {
12892                                         /* tack it to the end */
12893                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12894                                         sp->tail_mbuf = new_tail;
12895                                 } else {
12896                                         /* A stolen mbuf */
12897                                         sp->data = mm;
12898                                         sp->tail_mbuf = new_tail;
12899                                 }
12900                                 sctp_snd_sb_alloc(stcb, sndout);
12901                                 atomic_add_int(&sp->length, sndout);
12902                                 len += sndout;
12903
12904                                 /* Did we reach EOR? */
12905                                 if ((uio->uio_resid == 0) &&
12906                                     ((user_marks_eor == 0) ||
12907                                     (srcv->sinfo_flags & SCTP_EOF) ||
12908                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12909                                         sp->msg_is_complete = 1;
12910                                 } else {
12911                                         sp->msg_is_complete = 0;
12912                                 }
12913                                 SCTP_TCB_SEND_UNLOCK(stcb);
12914                         }
12915                         if (uio->uio_resid == 0) {
12916                                 /* got it all? */
12917                                 continue;
12918                         }
12919                         /* PR-SCTP? */
12920                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12921                                 /*
12922                                  * This is ugly but we must assure locking
12923                                  * order
12924                                  */
12925                                 if (hold_tcblock == 0) {
12926                                         SCTP_TCB_LOCK(stcb);
12927                                         hold_tcblock = 1;
12928                                 }
12929                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12930                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12931                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12932                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12933                                 else
12934                                         max_len = 0;
12935                                 if (max_len > 0) {
12936                                         continue;
12937                                 }
12938                                 SCTP_TCB_UNLOCK(stcb);
12939                                 hold_tcblock = 0;
12940                         }
12941                         /* wait for space now */
12942                         if (non_blocking) {
12943                                 /* Non-blocking io in place out */
12944                                 goto skip_out_eof;
12945                         }
12946                         /* What about the INIT, send it maybe */
12947                         if (queue_only_for_init) {
12948                                 if (hold_tcblock == 0) {
12949                                         SCTP_TCB_LOCK(stcb);
12950                                         hold_tcblock = 1;
12951                                 }
12952                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12953                                         /* a collision took us forward? */
12954                                         queue_only = 0;
12955                                 } else {
12956                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12957                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12958                                         queue_only = 1;
12959                                 }
12960                         }
12961                         if ((net->flight_size > net->cwnd) &&
12962                             (asoc->sctp_cmt_on_off == 0)) {
12963                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12964                                 queue_only = 1;
12965                         } else if (asoc->ifp_had_enobuf) {
12966                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12967                                 if (net->flight_size > (2 * net->mtu)) {
12968                                         queue_only = 1;
12969                                 }
12970                                 asoc->ifp_had_enobuf = 0;
12971                         }
12972                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12973                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12974                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12975                             (stcb->asoc.total_flight > 0) &&
12976                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12977                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12978
12979                                 /*-
12980                                  * Ok, Nagle is set on and we have data outstanding.
12981                                  * Don't send anything and let SACKs drive out the
12982                                  * data unless wen have a "full" segment to send.
12983                                  */
12984                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12985                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12986                                 }
12987                                 SCTP_STAT_INCR(sctps_naglequeued);
12988                                 nagle_applies = 1;
12989                         } else {
12990                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12991                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12992                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12993                                 }
12994                                 SCTP_STAT_INCR(sctps_naglesent);
12995                                 nagle_applies = 0;
12996                         }
12997                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12998
12999                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13000                                     nagle_applies, un_sent);
13001                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13002                                     stcb->asoc.total_flight,
13003                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13004                         }
13005                         if (queue_only_for_init)
13006                                 queue_only_for_init = 0;
13007                         if ((queue_only == 0) && (nagle_applies == 0)) {
13008                                 /*-
13009                                  * need to start chunk output
13010                                  * before blocking.. note that if
13011                                  * a lock is already applied, then
13012                                  * the input via the net is happening
13013                                  * and I don't need to start output :-D
13014                                  */
13015                                 if (hold_tcblock == 0) {
13016                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13017                                                 hold_tcblock = 1;
13018                                                 sctp_chunk_output(inp,
13019                                                     stcb,
13020                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13021                                         }
13022                                 } else {
13023                                         sctp_chunk_output(inp,
13024                                             stcb,
13025                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13026                                 }
13027                                 if (hold_tcblock == 1) {
13028                                         SCTP_TCB_UNLOCK(stcb);
13029                                         hold_tcblock = 0;
13030                                 }
13031                         }
13032                         SOCKBUF_LOCK(&so->so_snd);
13033                         /*-
13034                          * This is a bit strange, but I think it will
13035                          * work. The total_output_queue_size is locked and
13036                          * protected by the TCB_LOCK, which we just released.
13037                          * There is a race that can occur between releasing it
13038                          * above, and me getting the socket lock, where sacks
13039                          * come in but we have not put the SB_WAIT on the
13040                          * so_snd buffer to get the wakeup. After the LOCK
13041                          * is applied the sack_processing will also need to
13042                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13043                          * once we have the socket buffer lock if we recheck the
13044                          * size we KNOW we will get to sleep safely with the
13045                          * wakeup flag in place.
13046                          */
13047                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13048                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13049                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13050                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13051                                             asoc, uio->uio_resid);
13052                                 }
13053                                 be.error = 0;
13054                                 stcb->block_entry = &be;
13055                                 error = sbwait(&so->so_snd);
13056                                 stcb->block_entry = NULL;
13057
13058                                 if (error || so->so_error || be.error) {
13059                                         if (error == 0) {
13060                                                 if (so->so_error)
13061                                                         error = so->so_error;
13062                                                 if (be.error) {
13063                                                         error = be.error;
13064                                                 }
13065                                         }
13066                                         SOCKBUF_UNLOCK(&so->so_snd);
13067                                         goto out_unlocked;
13068                                 }
13069                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13070                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13071                                             asoc, stcb->asoc.total_output_queue_size);
13072                                 }
13073                         }
13074                         SOCKBUF_UNLOCK(&so->so_snd);
13075                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13076                                 goto out_unlocked;
13077                         }
13078                 }
13079                 SCTP_TCB_SEND_LOCK(stcb);
13080                 if (sp) {
13081                         if (sp->msg_is_complete == 0) {
13082                                 strm->last_msg_incomplete = 1;
13083                                 asoc->stream_locked = 1;
13084                                 asoc->stream_locked_on = srcv->sinfo_stream;
13085                         } else {
13086                                 sp->sender_all_done = 1;
13087                                 strm->last_msg_incomplete = 0;
13088                                 asoc->stream_locked = 0;
13089                         }
13090                 } else {
13091                         SCTP_PRINTF("Huh no sp TSNH?\n");
13092                         strm->last_msg_incomplete = 0;
13093                         asoc->stream_locked = 0;
13094                 }
13095                 SCTP_TCB_SEND_UNLOCK(stcb);
13096                 if (uio->uio_resid == 0) {
13097                         got_all_of_the_send = 1;
13098                 }
13099         } else {
13100                 /* We send in a 0, since we do NOT have any locks */
13101                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13102                 top = NULL;
13103                 if (srcv->sinfo_flags & SCTP_EOF) {
13104                         /*
13105                          * This should only happen for Panda for the mbuf
13106                          * send case, which does NOT yet support EEOR mode.
13107                          * Thus, we can just set this flag to do the proper
13108                          * EOF handling.
13109                          */
13110                         got_all_of_the_send = 1;
13111                 }
13112         }
13113         if (error) {
13114                 goto out;
13115         }
13116 dataless_eof:
13117         /* EOF thing ? */
13118         if ((srcv->sinfo_flags & SCTP_EOF) &&
13119             (got_all_of_the_send == 1)) {
13120                 int cnt;
13121
13122                 SCTP_STAT_INCR(sctps_sends_with_eof);
13123                 error = 0;
13124                 if (hold_tcblock == 0) {
13125                         SCTP_TCB_LOCK(stcb);
13126                         hold_tcblock = 1;
13127                 }
13128                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13129                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13130                     TAILQ_EMPTY(&asoc->sent_queue) &&
13131                     (cnt == 0)) {
13132                         if (asoc->locked_on_sending) {
13133                                 goto abort_anyway;
13134                         }
13135                         /* there is nothing queued to send, so I'm done... */
13136                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13137                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13138                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13139                                 struct sctp_nets *netp;
13140
13141                                 if (stcb->asoc.alternate) {
13142                                         netp = stcb->asoc.alternate;
13143                                 } else {
13144                                         netp = stcb->asoc.primary_destination;
13145                                 }
13146                                 /* only send SHUTDOWN the first time through */
13147                                 sctp_send_shutdown(stcb, netp);
13148                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13149                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13150                                 }
13151                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13152                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13153                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13154                                     netp);
13155                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13156                                     asoc->primary_destination);
13157                         }
13158                 } else {
13159                         /*-
13160                          * we still got (or just got) data to send, so set
13161                          * SHUTDOWN_PENDING
13162                          */
13163                         /*-
13164                          * XXX sockets draft says that SCTP_EOF should be
13165                          * sent with no data.  currently, we will allow user
13166                          * data to be sent first and move to
13167                          * SHUTDOWN-PENDING
13168                          */
13169                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13170                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13171                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13172                                 if (hold_tcblock == 0) {
13173                                         SCTP_TCB_LOCK(stcb);
13174                                         hold_tcblock = 1;
13175                                 }
13176                                 if (asoc->locked_on_sending) {
13177                                         /* Locked to send out the data */
13178                                         struct sctp_stream_queue_pending *sp;
13179
13180                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13181                                         if (sp) {
13182                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13183                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13184                                         }
13185                                 }
13186                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13187                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13188                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13189                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13190                         abort_anyway:
13191                                         if (free_cnt_applied) {
13192                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13193                                                 free_cnt_applied = 0;
13194                                         }
13195                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13196                                             NULL, SCTP_SO_LOCKED);
13197                                         /*
13198                                          * now relock the stcb so everything
13199                                          * is sane
13200                                          */
13201                                         hold_tcblock = 0;
13202                                         stcb = NULL;
13203                                         goto out;
13204                                 }
13205                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13206                                     asoc->primary_destination);
13207                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13208                         }
13209                 }
13210         }
13211 skip_out_eof:
13212         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13213                 some_on_control = 1;
13214         }
13215         if (queue_only_for_init) {
13216                 if (hold_tcblock == 0) {
13217                         SCTP_TCB_LOCK(stcb);
13218                         hold_tcblock = 1;
13219                 }
13220                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13221                         /* a collision took us forward? */
13222                         queue_only = 0;
13223                 } else {
13224                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13225                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13226                         queue_only = 1;
13227                 }
13228         }
13229         if ((net->flight_size > net->cwnd) &&
13230             (stcb->asoc.sctp_cmt_on_off == 0)) {
13231                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13232                 queue_only = 1;
13233         } else if (asoc->ifp_had_enobuf) {
13234                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13235                 if (net->flight_size > (2 * net->mtu)) {
13236                         queue_only = 1;
13237                 }
13238                 asoc->ifp_had_enobuf = 0;
13239         }
13240         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13241             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13242         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13243             (stcb->asoc.total_flight > 0) &&
13244             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13245             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13246                 /*-
13247                  * Ok, Nagle is set on and we have data outstanding.
13248                  * Don't send anything and let SACKs drive out the
13249                  * data unless wen have a "full" segment to send.
13250                  */
13251                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13252                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13253                 }
13254                 SCTP_STAT_INCR(sctps_naglequeued);
13255                 nagle_applies = 1;
13256         } else {
13257                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13258                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13259                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13260                 }
13261                 SCTP_STAT_INCR(sctps_naglesent);
13262                 nagle_applies = 0;
13263         }
13264         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13265                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13266                     nagle_applies, un_sent);
13267                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13268                     stcb->asoc.total_flight,
13269                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13270         }
13271         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13272                 /* we can attempt to send too. */
13273                 if (hold_tcblock == 0) {
13274                         /*
13275                          * If there is activity recv'ing sacks no need to
13276                          * send
13277                          */
13278                         if (SCTP_TCB_TRYLOCK(stcb)) {
13279                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13280                                 hold_tcblock = 1;
13281                         }
13282                 } else {
13283                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13284                 }
13285         } else if ((queue_only == 0) &&
13286                     (stcb->asoc.peers_rwnd == 0) &&
13287             (stcb->asoc.total_flight == 0)) {
13288                 /* We get to have a probe outstanding */
13289                 if (hold_tcblock == 0) {
13290                         hold_tcblock = 1;
13291                         SCTP_TCB_LOCK(stcb);
13292                 }
13293                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13294         } else if (some_on_control) {
13295                 int num_out, reason, frag_point;
13296
13297                 /* Here we do control only */
13298                 if (hold_tcblock == 0) {
13299                         hold_tcblock = 1;
13300                         SCTP_TCB_LOCK(stcb);
13301                 }
13302                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13303                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13304                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13305         }
13306         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13307             queue_only, stcb->asoc.peers_rwnd, un_sent,
13308             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13309             stcb->asoc.total_output_queue_size, error);
13310
13311 out:
13312 out_unlocked:
13313
13314         if (local_soresv && stcb) {
13315                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13316         }
13317         if (create_lock_applied) {
13318                 SCTP_ASOC_CREATE_UNLOCK(inp);
13319         }
13320         if ((stcb) && hold_tcblock) {
13321                 SCTP_TCB_UNLOCK(stcb);
13322         }
13323         if (stcb && free_cnt_applied) {
13324                 atomic_add_int(&stcb->asoc.refcnt, -1);
13325         }
13326 #ifdef INVARIANTS
13327         if (stcb) {
13328                 if (mtx_owned(&stcb->tcb_mtx)) {
13329                         panic("Leaving with tcb mtx owned?");
13330                 }
13331                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13332                         panic("Leaving with tcb send mtx owned?");
13333                 }
13334         }
13335 #endif
13336 #ifdef INVARIANTS
13337         if (inp) {
13338                 sctp_validate_no_locks(inp);
13339         } else {
13340                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13341         }
13342 #endif
13343         if (top) {
13344                 sctp_m_freem(top);
13345         }
13346         if (control) {
13347                 sctp_m_freem(control);
13348         }
13349         return (error);
13350 }
13351
13352
13353 /*
13354  * generate an AUTHentication chunk, if required
13355  */
13356 struct mbuf *
13357 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13358     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13359     struct sctp_tcb *stcb, uint8_t chunk)
13360 {
13361         struct mbuf *m_auth;
13362         struct sctp_auth_chunk *auth;
13363         int chunk_len;
13364         struct mbuf *cn;
13365
13366         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13367             (stcb == NULL))
13368                 return (m);
13369
13370         /* sysctl disabled auth? */
13371         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13372                 return (m);
13373
13374         /* peer doesn't do auth... */
13375         if (!stcb->asoc.peer_supports_auth) {
13376                 return (m);
13377         }
13378         /* does the requested chunk require auth? */
13379         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13380                 return (m);
13381         }
13382         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13383         if (m_auth == NULL) {
13384                 /* no mbuf's */
13385                 return (m);
13386         }
13387         /* reserve some space if this will be the first mbuf */
13388         if (m == NULL)
13389                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13390         /* fill in the AUTH chunk details */
13391         auth = mtod(m_auth, struct sctp_auth_chunk *);
13392         bzero(auth, sizeof(*auth));
13393         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13394         auth->ch.chunk_flags = 0;
13395         chunk_len = sizeof(*auth) +
13396             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13397         auth->ch.chunk_length = htons(chunk_len);
13398         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13399         /* key id and hmac digest will be computed and filled in upon send */
13400
13401         /* save the offset where the auth was inserted into the chain */
13402         *offset = 0;
13403         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13404                 *offset += SCTP_BUF_LEN(cn);
13405         }
13406
13407         /* update length and return pointer to the auth chunk */
13408         SCTP_BUF_LEN(m_auth) = chunk_len;
13409         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13410         if (auth_ret != NULL)
13411                 *auth_ret = auth;
13412
13413         return (m);
13414 }
13415
13416 #ifdef INET6
13417 int
13418 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13419 {
13420         struct nd_prefix *pfx = NULL;
13421         struct nd_pfxrouter *pfxrtr = NULL;
13422         struct sockaddr_in6 gw6;
13423
13424         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13425                 return (0);
13426
13427         /* get prefix entry of address */
13428         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13429                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13430                         continue;
13431                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13432                     &src6->sin6_addr, &pfx->ndpr_mask))
13433                         break;
13434         }
13435         /* no prefix entry in the prefix list */
13436         if (pfx == NULL) {
13437                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13438                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13439                 return (0);
13440         }
13441         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13442         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13443
13444         /* search installed gateway from prefix entry */
13445         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13446                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13447                 gw6.sin6_family = AF_INET6;
13448                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13449                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13450                     sizeof(struct in6_addr));
13451                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13452                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13453                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13454                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13455                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13456                     ro->ro_rt->rt_gateway)) {
13457                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13458                         return (1);
13459                 }
13460         }
13461         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13462         return (0);
13463 }
13464
13465 #endif
13466
13467 int
13468 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13469 {
13470 #ifdef INET
13471         struct sockaddr_in *sin, *mask;
13472         struct ifaddr *ifa;
13473         struct in_addr srcnetaddr, gwnetaddr;
13474
13475         if (ro == NULL || ro->ro_rt == NULL ||
13476             sifa->address.sa.sa_family != AF_INET) {
13477                 return (0);
13478         }
13479         ifa = (struct ifaddr *)sifa->ifa;
13480         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13481         sin = (struct sockaddr_in *)&sifa->address.sin;
13482         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13483         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13484         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13485         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13486
13487         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13488         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13489         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13490         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13491         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13492         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13493                 return (1);
13494         }
13495 #endif
13496         return (0);
13497 }