sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #include <netinet/udp.h>
  54 #include <netinet/udp_var.h>
  55 #include <machine/in_cksum.h>
  56
  57
  58
  59 #define SCTP_MAX_GAPS_INARRAY 4
  60 struct sack_track {
  61         uint8_t right_edge;     /* mergable on the right edge */
  62         uint8_t left_edge;      /* mergable on the left edge */
  63         uint8_t num_entries;
  64         uint8_t spare;
  65         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  66 };
  67
  68 struct sack_track sack_array[256] = {
  69         {0, 0, 0, 0,            /* 0x00 */
  70                 {{0, 0},
  71                 {0, 0},
  72                 {0, 0},
  73                 {0, 0}
  74                 }
  75         },
  76         {1, 0, 1, 0,            /* 0x01 */
  77                 {{0, 0},
  78                 {0, 0},
  79                 {0, 0},
  80                 {0, 0}
  81                 }
  82         },
  83         {0, 0, 1, 0,            /* 0x02 */
  84                 {{1, 1},
  85                 {0, 0},
  86                 {0, 0},
  87                 {0, 0}
  88                 }
  89         },
  90         {1, 0, 1, 0,            /* 0x03 */
  91                 {{0, 1},
  92                 {0, 0},
  93                 {0, 0},
  94                 {0, 0}
  95                 }
  96         },
  97         {0, 0, 1, 0,            /* 0x04 */
  98                 {{2, 2},
  99                 {0, 0},
 100                 {0, 0},
 101                 {0, 0}
 102                 }
 103         },
 104         {1, 0, 2, 0,            /* 0x05 */
 105                 {{0, 0},
 106                 {2, 2},
 107                 {0, 0},
 108                 {0, 0}
 109                 }
 110         },
 111         {0, 0, 1, 0,            /* 0x06 */
 112                 {{1, 2},
 113                 {0, 0},
 114                 {0, 0},
 115                 {0, 0}
 116                 }
 117         },
 118         {1, 0, 1, 0,            /* 0x07 */
 119                 {{0, 2},
 120                 {0, 0},
 121                 {0, 0},
 122                 {0, 0}
 123                 }
 124         },
 125         {0, 0, 1, 0,            /* 0x08 */
 126                 {{3, 3},
 127                 {0, 0},
 128                 {0, 0},
 129                 {0, 0}
 130                 }
 131         },
 132         {1, 0, 2, 0,            /* 0x09 */
 133                 {{0, 0},
 134                 {3, 3},
 135                 {0, 0},
 136                 {0, 0}
 137                 }
 138         },
 139         {0, 0, 2, 0,            /* 0x0a */
 140                 {{1, 1},
 141                 {3, 3},
 142                 {0, 0},
 143                 {0, 0}
 144                 }
 145         },
 146         {1, 0, 2, 0,            /* 0x0b */
 147                 {{0, 1},
 148                 {3, 3},
 149                 {0, 0},
 150                 {0, 0}
 151                 }
 152         },
 153         {0, 0, 1, 0,            /* 0x0c */
 154                 {{2, 3},
 155                 {0, 0},
 156                 {0, 0},
 157                 {0, 0}
 158                 }
 159         },
 160         {1, 0, 2, 0,            /* 0x0d */
 161                 {{0, 0},
 162                 {2, 3},
 163                 {0, 0},
 164                 {0, 0}
 165                 }
 166         },
 167         {0, 0, 1, 0,            /* 0x0e */
 168                 {{1, 3},
 169                 {0, 0},
 170                 {0, 0},
 171                 {0, 0}
 172                 }
 173         },
 174         {1, 0, 1, 0,            /* 0x0f */
 175                 {{0, 3},
 176                 {0, 0},
 177                 {0, 0},
 178                 {0, 0}
 179                 }
 180         },
 181         {0, 0, 1, 0,            /* 0x10 */
 182                 {{4, 4},
 183                 {0, 0},
 184                 {0, 0},
 185                 {0, 0}
 186                 }
 187         },
 188         {1, 0, 2, 0,            /* 0x11 */
 189                 {{0, 0},
 190                 {4, 4},
 191                 {0, 0},
 192                 {0, 0}
 193                 }
 194         },
 195         {0, 0, 2, 0,            /* 0x12 */
 196                 {{1, 1},
 197                 {4, 4},
 198                 {0, 0},
 199                 {0, 0}
 200                 }
 201         },
 202         {1, 0, 2, 0,            /* 0x13 */
 203                 {{0, 1},
 204                 {4, 4},
 205                 {0, 0},
 206                 {0, 0}
 207                 }
 208         },
 209         {0, 0, 2, 0,            /* 0x14 */
 210                 {{2, 2},
 211                 {4, 4},
 212                 {0, 0},
 213                 {0, 0}
 214                 }
 215         },
 216         {1, 0, 3, 0,            /* 0x15 */
 217                 {{0, 0},
 218                 {2, 2},
 219                 {4, 4},
 220                 {0, 0}
 221                 }
 222         },
 223         {0, 0, 2, 0,            /* 0x16 */
 224                 {{1, 2},
 225                 {4, 4},
 226                 {0, 0},
 227                 {0, 0}
 228                 }
 229         },
 230         {1, 0, 2, 0,            /* 0x17 */
 231                 {{0, 2},
 232                 {4, 4},
 233                 {0, 0},
 234                 {0, 0}
 235                 }
 236         },
 237         {0, 0, 1, 0,            /* 0x18 */
 238                 {{3, 4},
 239                 {0, 0},
 240                 {0, 0},
 241                 {0, 0}
 242                 }
 243         },
 244         {1, 0, 2, 0,            /* 0x19 */
 245                 {{0, 0},
 246                 {3, 4},
 247                 {0, 0},
 248                 {0, 0}
 249                 }
 250         },
 251         {0, 0, 2, 0,            /* 0x1a */
 252                 {{1, 1},
 253                 {3, 4},
 254                 {0, 0},
 255                 {0, 0}
 256                 }
 257         },
 258         {1, 0, 2, 0,            /* 0x1b */
 259                 {{0, 1},
 260                 {3, 4},
 261                 {0, 0},
 262                 {0, 0}
 263                 }
 264         },
 265         {0, 0, 1, 0,            /* 0x1c */
 266                 {{2, 4},
 267                 {0, 0},
 268                 {0, 0},
 269                 {0, 0}
 270                 }
 271         },
 272         {1, 0, 2, 0,            /* 0x1d */
 273                 {{0, 0},
 274                 {2, 4},
 275                 {0, 0},
 276                 {0, 0}
 277                 }
 278         },
 279         {0, 0, 1, 0,            /* 0x1e */
 280                 {{1, 4},
 281                 {0, 0},
 282                 {0, 0},
 283                 {0, 0}
 284                 }
 285         },
 286         {1, 0, 1, 0,            /* 0x1f */
 287                 {{0, 4},
 288                 {0, 0},
 289                 {0, 0},
 290                 {0, 0}
 291                 }
 292         },
 293         {0, 0, 1, 0,            /* 0x20 */
 294                 {{5, 5},
 295                 {0, 0},
 296                 {0, 0},
 297                 {0, 0}
 298                 }
 299         },
 300         {1, 0, 2, 0,            /* 0x21 */
 301                 {{0, 0},
 302                 {5, 5},
 303                 {0, 0},
 304                 {0, 0}
 305                 }
 306         },
 307         {0, 0, 2, 0,            /* 0x22 */
 308                 {{1, 1},
 309                 {5, 5},
 310                 {0, 0},
 311                 {0, 0}
 312                 }
 313         },
 314         {1, 0, 2, 0,            /* 0x23 */
 315                 {{0, 1},
 316                 {5, 5},
 317                 {0, 0},
 318                 {0, 0}
 319                 }
 320         },
 321         {0, 0, 2, 0,            /* 0x24 */
 322                 {{2, 2},
 323                 {5, 5},
 324                 {0, 0},
 325                 {0, 0}
 326                 }
 327         },
 328         {1, 0, 3, 0,            /* 0x25 */
 329                 {{0, 0},
 330                 {2, 2},
 331                 {5, 5},
 332                 {0, 0}
 333                 }
 334         },
 335         {0, 0, 2, 0,            /* 0x26 */
 336                 {{1, 2},
 337                 {5, 5},
 338                 {0, 0},
 339                 {0, 0}
 340                 }
 341         },
 342         {1, 0, 2, 0,            /* 0x27 */
 343                 {{0, 2},
 344                 {5, 5},
 345                 {0, 0},
 346                 {0, 0}
 347                 }
 348         },
 349         {0, 0, 2, 0,            /* 0x28 */
 350                 {{3, 3},
 351                 {5, 5},
 352                 {0, 0},
 353                 {0, 0}
 354                 }
 355         },
 356         {1, 0, 3, 0,            /* 0x29 */
 357                 {{0, 0},
 358                 {3, 3},
 359                 {5, 5},
 360                 {0, 0}
 361                 }
 362         },
 363         {0, 0, 3, 0,            /* 0x2a */
 364                 {{1, 1},
 365                 {3, 3},
 366                 {5, 5},
 367                 {0, 0}
 368                 }
 369         },
 370         {1, 0, 3, 0,            /* 0x2b */
 371                 {{0, 1},
 372                 {3, 3},
 373                 {5, 5},
 374                 {0, 0}
 375                 }
 376         },
 377         {0, 0, 2, 0,            /* 0x2c */
 378                 {{2, 3},
 379                 {5, 5},
 380                 {0, 0},
 381                 {0, 0}
 382                 }
 383         },
 384         {1, 0, 3, 0,            /* 0x2d */
 385                 {{0, 0},
 386                 {2, 3},
 387                 {5, 5},
 388                 {0, 0}
 389                 }
 390         },
 391         {0, 0, 2, 0,            /* 0x2e */
 392                 {{1, 3},
 393                 {5, 5},
 394                 {0, 0},
 395                 {0, 0}
 396                 }
 397         },
 398         {1, 0, 2, 0,            /* 0x2f */
 399                 {{0, 3},
 400                 {5, 5},
 401                 {0, 0},
 402                 {0, 0}
 403                 }
 404         },
 405         {0, 0, 1, 0,            /* 0x30 */
 406                 {{4, 5},
 407                 {0, 0},
 408                 {0, 0},
 409                 {0, 0}
 410                 }
 411         },
 412         {1, 0, 2, 0,            /* 0x31 */
 413                 {{0, 0},
 414                 {4, 5},
 415                 {0, 0},
 416                 {0, 0}
 417                 }
 418         },
 419         {0, 0, 2, 0,            /* 0x32 */
 420                 {{1, 1},
 421                 {4, 5},
 422                 {0, 0},
 423                 {0, 0}
 424                 }
 425         },
 426         {1, 0, 2, 0,            /* 0x33 */
 427                 {{0, 1},
 428                 {4, 5},
 429                 {0, 0},
 430                 {0, 0}
 431                 }
 432         },
 433         {0, 0, 2, 0,            /* 0x34 */
 434                 {{2, 2},
 435                 {4, 5},
 436                 {0, 0},
 437                 {0, 0}
 438                 }
 439         },
 440         {1, 0, 3, 0,            /* 0x35 */
 441                 {{0, 0},
 442                 {2, 2},
 443                 {4, 5},
 444                 {0, 0}
 445                 }
 446         },
 447         {0, 0, 2, 0,            /* 0x36 */
 448                 {{1, 2},
 449                 {4, 5},
 450                 {0, 0},
 451                 {0, 0}
 452                 }
 453         },
 454         {1, 0, 2, 0,            /* 0x37 */
 455                 {{0, 2},
 456                 {4, 5},
 457                 {0, 0},
 458                 {0, 0}
 459                 }
 460         },
 461         {0, 0, 1, 0,            /* 0x38 */
 462                 {{3, 5},
 463                 {0, 0},
 464                 {0, 0},
 465                 {0, 0}
 466                 }
 467         },
 468         {1, 0, 2, 0,            /* 0x39 */
 469                 {{0, 0},
 470                 {3, 5},
 471                 {0, 0},
 472                 {0, 0}
 473                 }
 474         },
 475         {0, 0, 2, 0,            /* 0x3a */
 476                 {{1, 1},
 477                 {3, 5},
 478                 {0, 0},
 479                 {0, 0}
 480                 }
 481         },
 482         {1, 0, 2, 0,            /* 0x3b */
 483                 {{0, 1},
 484                 {3, 5},
 485                 {0, 0},
 486                 {0, 0}
 487                 }
 488         },
 489         {0, 0, 1, 0,            /* 0x3c */
 490                 {{2, 5},
 491                 {0, 0},
 492                 {0, 0},
 493                 {0, 0}
 494                 }
 495         },
 496         {1, 0, 2, 0,            /* 0x3d */
 497                 {{0, 0},
 498                 {2, 5},
 499                 {0, 0},
 500                 {0, 0}
 501                 }
 502         },
 503         {0, 0, 1, 0,            /* 0x3e */
 504                 {{1, 5},
 505                 {0, 0},
 506                 {0, 0},
 507                 {0, 0}
 508                 }
 509         },
 510         {1, 0, 1, 0,            /* 0x3f */
 511                 {{0, 5},
 512                 {0, 0},
 513                 {0, 0},
 514                 {0, 0}
 515                 }
 516         },
 517         {0, 0, 1, 0,            /* 0x40 */
 518                 {{6, 6},
 519                 {0, 0},
 520                 {0, 0},
 521                 {0, 0}
 522                 }
 523         },
 524         {1, 0, 2, 0,            /* 0x41 */
 525                 {{0, 0},
 526                 {6, 6},
 527                 {0, 0},
 528                 {0, 0}
 529                 }
 530         },
 531         {0, 0, 2, 0,            /* 0x42 */
 532                 {{1, 1},
 533                 {6, 6},
 534                 {0, 0},
 535                 {0, 0}
 536                 }
 537         },
 538         {1, 0, 2, 0,            /* 0x43 */
 539                 {{0, 1},
 540                 {6, 6},
 541                 {0, 0},
 542                 {0, 0}
 543                 }
 544         },
 545         {0, 0, 2, 0,            /* 0x44 */
 546                 {{2, 2},
 547                 {6, 6},
 548                 {0, 0},
 549                 {0, 0}
 550                 }
 551         },
 552         {1, 0, 3, 0,            /* 0x45 */
 553                 {{0, 0},
 554                 {2, 2},
 555                 {6, 6},
 556                 {0, 0}
 557                 }
 558         },
 559         {0, 0, 2, 0,            /* 0x46 */
 560                 {{1, 2},
 561                 {6, 6},
 562                 {0, 0},
 563                 {0, 0}
 564                 }
 565         },
 566         {1, 0, 2, 0,            /* 0x47 */
 567                 {{0, 2},
 568                 {6, 6},
 569                 {0, 0},
 570                 {0, 0}
 571                 }
 572         },
 573         {0, 0, 2, 0,            /* 0x48 */
 574                 {{3, 3},
 575                 {6, 6},
 576                 {0, 0},
 577                 {0, 0}
 578                 }
 579         },
 580         {1, 0, 3, 0,            /* 0x49 */
 581                 {{0, 0},
 582                 {3, 3},
 583                 {6, 6},
 584                 {0, 0}
 585                 }
 586         },
 587         {0, 0, 3, 0,            /* 0x4a */
 588                 {{1, 1},
 589                 {3, 3},
 590                 {6, 6},
 591                 {0, 0}
 592                 }
 593         },
 594         {1, 0, 3, 0,            /* 0x4b */
 595                 {{0, 1},
 596                 {3, 3},
 597                 {6, 6},
 598                 {0, 0}
 599                 }
 600         },
 601         {0, 0, 2, 0,            /* 0x4c */
 602                 {{2, 3},
 603                 {6, 6},
 604                 {0, 0},
 605                 {0, 0}
 606                 }
 607         },
 608         {1, 0, 3, 0,            /* 0x4d */
 609                 {{0, 0},
 610                 {2, 3},
 611                 {6, 6},
 612                 {0, 0}
 613                 }
 614         },
 615         {0, 0, 2, 0,            /* 0x4e */
 616                 {{1, 3},
 617                 {6, 6},
 618                 {0, 0},
 619                 {0, 0}
 620                 }
 621         },
 622         {1, 0, 2, 0,            /* 0x4f */
 623                 {{0, 3},
 624                 {6, 6},
 625                 {0, 0},
 626                 {0, 0}
 627                 }
 628         },
 629         {0, 0, 2, 0,            /* 0x50 */
 630                 {{4, 4},
 631                 {6, 6},
 632                 {0, 0},
 633                 {0, 0}
 634                 }
 635         },
 636         {1, 0, 3, 0,            /* 0x51 */
 637                 {{0, 0},
 638                 {4, 4},
 639                 {6, 6},
 640                 {0, 0}
 641                 }
 642         },
 643         {0, 0, 3, 0,            /* 0x52 */
 644                 {{1, 1},
 645                 {4, 4},
 646                 {6, 6},
 647                 {0, 0}
 648                 }
 649         },
 650         {1, 0, 3, 0,            /* 0x53 */
 651                 {{0, 1},
 652                 {4, 4},
 653                 {6, 6},
 654                 {0, 0}
 655                 }
 656         },
 657         {0, 0, 3, 0,            /* 0x54 */
 658                 {{2, 2},
 659                 {4, 4},
 660                 {6, 6},
 661                 {0, 0}
 662                 }
 663         },
 664         {1, 0, 4, 0,            /* 0x55 */
 665                 {{0, 0},
 666                 {2, 2},
 667                 {4, 4},
 668                 {6, 6}
 669                 }
 670         },
 671         {0, 0, 3, 0,            /* 0x56 */
 672                 {{1, 2},
 673                 {4, 4},
 674                 {6, 6},
 675                 {0, 0}
 676                 }
 677         },
 678         {1, 0, 3, 0,            /* 0x57 */
 679                 {{0, 2},
 680                 {4, 4},
 681                 {6, 6},
 682                 {0, 0}
 683                 }
 684         },
 685         {0, 0, 2, 0,            /* 0x58 */
 686                 {{3, 4},
 687                 {6, 6},
 688                 {0, 0},
 689                 {0, 0}
 690                 }
 691         },
 692         {1, 0, 3, 0,            /* 0x59 */
 693                 {{0, 0},
 694                 {3, 4},
 695                 {6, 6},
 696                 {0, 0}
 697                 }
 698         },
 699         {0, 0, 3, 0,            /* 0x5a */
 700                 {{1, 1},
 701                 {3, 4},
 702                 {6, 6},
 703                 {0, 0}
 704                 }
 705         },
 706         {1, 0, 3, 0,            /* 0x5b */
 707                 {{0, 1},
 708                 {3, 4},
 709                 {6, 6},
 710                 {0, 0}
 711                 }
 712         },
 713         {0, 0, 2, 0,            /* 0x5c */
 714                 {{2, 4},
 715                 {6, 6},
 716                 {0, 0},
 717                 {0, 0}
 718                 }
 719         },
 720         {1, 0, 3, 0,            /* 0x5d */
 721                 {{0, 0},
 722                 {2, 4},
 723                 {6, 6},
 724                 {0, 0}
 725                 }
 726         },
 727         {0, 0, 2, 0,            /* 0x5e */
 728                 {{1, 4},
 729                 {6, 6},
 730                 {0, 0},
 731                 {0, 0}
 732                 }
 733         },
 734         {1, 0, 2, 0,            /* 0x5f */
 735                 {{0, 4},
 736                 {6, 6},
 737                 {0, 0},
 738                 {0, 0}
 739                 }
 740         },
 741         {0, 0, 1, 0,            /* 0x60 */
 742                 {{5, 6},
 743                 {0, 0},
 744                 {0, 0},
 745                 {0, 0}
 746                 }
 747         },
 748         {1, 0, 2, 0,            /* 0x61 */
 749                 {{0, 0},
 750                 {5, 6},
 751                 {0, 0},
 752                 {0, 0}
 753                 }
 754         },
 755         {0, 0, 2, 0,            /* 0x62 */
 756                 {{1, 1},
 757                 {5, 6},
 758                 {0, 0},
 759                 {0, 0}
 760                 }
 761         },
 762         {1, 0, 2, 0,            /* 0x63 */
 763                 {{0, 1},
 764                 {5, 6},
 765                 {0, 0},
 766                 {0, 0}
 767                 }
 768         },
 769         {0, 0, 2, 0,            /* 0x64 */
 770                 {{2, 2},
 771                 {5, 6},
 772                 {0, 0},
 773                 {0, 0}
 774                 }
 775         },
 776         {1, 0, 3, 0,            /* 0x65 */
 777                 {{0, 0},
 778                 {2, 2},
 779                 {5, 6},
 780                 {0, 0}
 781                 }
 782         },
 783         {0, 0, 2, 0,            /* 0x66 */
 784                 {{1, 2},
 785                 {5, 6},
 786                 {0, 0},
 787                 {0, 0}
 788                 }
 789         },
 790         {1, 0, 2, 0,            /* 0x67 */
 791                 {{0, 2},
 792                 {5, 6},
 793                 {0, 0},
 794                 {0, 0}
 795                 }
 796         },
 797         {0, 0, 2, 0,            /* 0x68 */
 798                 {{3, 3},
 799                 {5, 6},
 800                 {0, 0},
 801                 {0, 0}
 802                 }
 803         },
 804         {1, 0, 3, 0,            /* 0x69 */
 805                 {{0, 0},
 806                 {3, 3},
 807                 {5, 6},
 808                 {0, 0}
 809                 }
 810         },
 811         {0, 0, 3, 0,            /* 0x6a */
 812                 {{1, 1},
 813                 {3, 3},
 814                 {5, 6},
 815                 {0, 0}
 816                 }
 817         },
 818         {1, 0, 3, 0,            /* 0x6b */
 819                 {{0, 1},
 820                 {3, 3},
 821                 {5, 6},
 822                 {0, 0}
 823                 }
 824         },
 825         {0, 0, 2, 0,            /* 0x6c */
 826                 {{2, 3},
 827                 {5, 6},
 828                 {0, 0},
 829                 {0, 0}
 830                 }
 831         },
 832         {1, 0, 3, 0,            /* 0x6d */
 833                 {{0, 0},
 834                 {2, 3},
 835                 {5, 6},
 836                 {0, 0}
 837                 }
 838         },
 839         {0, 0, 2, 0,            /* 0x6e */
 840                 {{1, 3},
 841                 {5, 6},
 842                 {0, 0},
 843                 {0, 0}
 844                 }
 845         },
 846         {1, 0, 2, 0,            /* 0x6f */
 847                 {{0, 3},
 848                 {5, 6},
 849                 {0, 0},
 850                 {0, 0}
 851                 }
 852         },
 853         {0, 0, 1, 0,            /* 0x70 */
 854                 {{4, 6},
 855                 {0, 0},
 856                 {0, 0},
 857                 {0, 0}
 858                 }
 859         },
 860         {1, 0, 2, 0,            /* 0x71 */
 861                 {{0, 0},
 862                 {4, 6},
 863                 {0, 0},
 864                 {0, 0}
 865                 }
 866         },
 867         {0, 0, 2, 0,            /* 0x72 */
 868                 {{1, 1},
 869                 {4, 6},
 870                 {0, 0},
 871                 {0, 0}
 872                 }
 873         },
 874         {1, 0, 2, 0,            /* 0x73 */
 875                 {{0, 1},
 876                 {4, 6},
 877                 {0, 0},
 878                 {0, 0}
 879                 }
 880         },
 881         {0, 0, 2, 0,            /* 0x74 */
 882                 {{2, 2},
 883                 {4, 6},
 884                 {0, 0},
 885                 {0, 0}
 886                 }
 887         },
 888         {1, 0, 3, 0,            /* 0x75 */
 889                 {{0, 0},
 890                 {2, 2},
 891                 {4, 6},
 892                 {0, 0}
 893                 }
 894         },
 895         {0, 0, 2, 0,            /* 0x76 */
 896                 {{1, 2},
 897                 {4, 6},
 898                 {0, 0},
 899                 {0, 0}
 900                 }
 901         },
 902         {1, 0, 2, 0,            /* 0x77 */
 903                 {{0, 2},
 904                 {4, 6},
 905                 {0, 0},
 906                 {0, 0}
 907                 }
 908         },
 909         {0, 0, 1, 0,            /* 0x78 */
 910                 {{3, 6},
 911                 {0, 0},
 912                 {0, 0},
 913                 {0, 0}
 914                 }
 915         },
 916         {1, 0, 2, 0,            /* 0x79 */
 917                 {{0, 0},
 918                 {3, 6},
 919                 {0, 0},
 920                 {0, 0}
 921                 }
 922         },
 923         {0, 0, 2, 0,            /* 0x7a */
 924                 {{1, 1},
 925                 {3, 6},
 926                 {0, 0},
 927                 {0, 0}
 928                 }
 929         },
 930         {1, 0, 2, 0,            /* 0x7b */
 931                 {{0, 1},
 932                 {3, 6},
 933                 {0, 0},
 934                 {0, 0}
 935                 }
 936         },
 937         {0, 0, 1, 0,            /* 0x7c */
 938                 {{2, 6},
 939                 {0, 0},
 940                 {0, 0},
 941                 {0, 0}
 942                 }
 943         },
 944         {1, 0, 2, 0,            /* 0x7d */
 945                 {{0, 0},
 946                 {2, 6},
 947                 {0, 0},
 948                 {0, 0}
 949                 }
 950         },
 951         {0, 0, 1, 0,            /* 0x7e */
 952                 {{1, 6},
 953                 {0, 0},
 954                 {0, 0},
 955                 {0, 0}
 956                 }
 957         },
 958         {1, 0, 1, 0,            /* 0x7f */
 959                 {{0, 6},
 960                 {0, 0},
 961                 {0, 0},
 962                 {0, 0}
 963                 }
 964         },
 965         {0, 1, 1, 0,            /* 0x80 */
 966                 {{7, 7},
 967                 {0, 0},
 968                 {0, 0},
 969                 {0, 0}
 970                 }
 971         },
 972         {1, 1, 2, 0,            /* 0x81 */
 973                 {{0, 0},
 974                 {7, 7},
 975                 {0, 0},
 976                 {0, 0}
 977                 }
 978         },
 979         {0, 1, 2, 0,            /* 0x82 */
 980                 {{1, 1},
 981                 {7, 7},
 982                 {0, 0},
 983                 {0, 0}
 984                 }
 985         },
 986         {1, 1, 2, 0,            /* 0x83 */
 987                 {{0, 1},
 988                 {7, 7},
 989                 {0, 0},
 990                 {0, 0}
 991                 }
 992         },
 993         {0, 1, 2, 0,            /* 0x84 */
 994                 {{2, 2},
 995                 {7, 7},
 996                 {0, 0},
 997                 {0, 0}
 998                 }
 999         },
1000         {1, 1, 3, 0,            /* 0x85 */
1001                 {{0, 0},
1002                 {2, 2},
1003                 {7, 7},
1004                 {0, 0}
1005                 }
1006         },
1007         {0, 1, 2, 0,            /* 0x86 */
1008                 {{1, 2},
1009                 {7, 7},
1010                 {0, 0},
1011                 {0, 0}
1012                 }
1013         },
1014         {1, 1, 2, 0,            /* 0x87 */
1015                 {{0, 2},
1016                 {7, 7},
1017                 {0, 0},
1018                 {0, 0}
1019                 }
1020         },
1021         {0, 1, 2, 0,            /* 0x88 */
1022                 {{3, 3},
1023                 {7, 7},
1024                 {0, 0},
1025                 {0, 0}
1026                 }
1027         },
1028         {1, 1, 3, 0,            /* 0x89 */
1029                 {{0, 0},
1030                 {3, 3},
1031                 {7, 7},
1032                 {0, 0}
1033                 }
1034         },
1035         {0, 1, 3, 0,            /* 0x8a */
1036                 {{1, 1},
1037                 {3, 3},
1038                 {7, 7},
1039                 {0, 0}
1040                 }
1041         },
1042         {1, 1, 3, 0,            /* 0x8b */
1043                 {{0, 1},
1044                 {3, 3},
1045                 {7, 7},
1046                 {0, 0}
1047                 }
1048         },
1049         {0, 1, 2, 0,            /* 0x8c */
1050                 {{2, 3},
1051                 {7, 7},
1052                 {0, 0},
1053                 {0, 0}
1054                 }
1055         },
1056         {1, 1, 3, 0,            /* 0x8d */
1057                 {{0, 0},
1058                 {2, 3},
1059                 {7, 7},
1060                 {0, 0}
1061                 }
1062         },
1063         {0, 1, 2, 0,            /* 0x8e */
1064                 {{1, 3},
1065                 {7, 7},
1066                 {0, 0},
1067                 {0, 0}
1068                 }
1069         },
1070         {1, 1, 2, 0,            /* 0x8f */
1071                 {{0, 3},
1072                 {7, 7},
1073                 {0, 0},
1074                 {0, 0}
1075                 }
1076         },
1077         {0, 1, 2, 0,            /* 0x90 */
1078                 {{4, 4},
1079                 {7, 7},
1080                 {0, 0},
1081                 {0, 0}
1082                 }
1083         },
1084         {1, 1, 3, 0,            /* 0x91 */
1085                 {{0, 0},
1086                 {4, 4},
1087                 {7, 7},
1088                 {0, 0}
1089                 }
1090         },
1091         {0, 1, 3, 0,            /* 0x92 */
1092                 {{1, 1},
1093                 {4, 4},
1094                 {7, 7},
1095                 {0, 0}
1096                 }
1097         },
1098         {1, 1, 3, 0,            /* 0x93 */
1099                 {{0, 1},
1100                 {4, 4},
1101                 {7, 7},
1102                 {0, 0}
1103                 }
1104         },
1105         {0, 1, 3, 0,            /* 0x94 */
1106                 {{2, 2},
1107                 {4, 4},
1108                 {7, 7},
1109                 {0, 0}
1110                 }
1111         },
1112         {1, 1, 4, 0,            /* 0x95 */
1113                 {{0, 0},
1114                 {2, 2},
1115                 {4, 4},
1116                 {7, 7}
1117                 }
1118         },
1119         {0, 1, 3, 0,            /* 0x96 */
1120                 {{1, 2},
1121                 {4, 4},
1122                 {7, 7},
1123                 {0, 0}
1124                 }
1125         },
1126         {1, 1, 3, 0,            /* 0x97 */
1127                 {{0, 2},
1128                 {4, 4},
1129                 {7, 7},
1130                 {0, 0}
1131                 }
1132         },
1133         {0, 1, 2, 0,            /* 0x98 */
1134                 {{3, 4},
1135                 {7, 7},
1136                 {0, 0},
1137                 {0, 0}
1138                 }
1139         },
1140         {1, 1, 3, 0,            /* 0x99 */
1141                 {{0, 0},
1142                 {3, 4},
1143                 {7, 7},
1144                 {0, 0}
1145                 }
1146         },
1147         {0, 1, 3, 0,            /* 0x9a */
1148                 {{1, 1},
1149                 {3, 4},
1150                 {7, 7},
1151                 {0, 0}
1152                 }
1153         },
1154         {1, 1, 3, 0,            /* 0x9b */
1155                 {{0, 1},
1156                 {3, 4},
1157                 {7, 7},
1158                 {0, 0}
1159                 }
1160         },
1161         {0, 1, 2, 0,            /* 0x9c */
1162                 {{2, 4},
1163                 {7, 7},
1164                 {0, 0},
1165                 {0, 0}
1166                 }
1167         },
1168         {1, 1, 3, 0,            /* 0x9d */
1169                 {{0, 0},
1170                 {2, 4},
1171                 {7, 7},
1172                 {0, 0}
1173                 }
1174         },
1175         {0, 1, 2, 0,            /* 0x9e */
1176                 {{1, 4},
1177                 {7, 7},
1178                 {0, 0},
1179                 {0, 0}
1180                 }
1181         },
1182         {1, 1, 2, 0,            /* 0x9f */
1183                 {{0, 4},
1184                 {7, 7},
1185                 {0, 0},
1186                 {0, 0}
1187                 }
1188         },
1189         {0, 1, 2, 0,            /* 0xa0 */
1190                 {{5, 5},
1191                 {7, 7},
1192                 {0, 0},
1193                 {0, 0}
1194                 }
1195         },
1196         {1, 1, 3, 0,            /* 0xa1 */
1197                 {{0, 0},
1198                 {5, 5},
1199                 {7, 7},
1200                 {0, 0}
1201                 }
1202         },
1203         {0, 1, 3, 0,            /* 0xa2 */
1204                 {{1, 1},
1205                 {5, 5},
1206                 {7, 7},
1207                 {0, 0}
1208                 }
1209         },
1210         {1, 1, 3, 0,            /* 0xa3 */
1211                 {{0, 1},
1212                 {5, 5},
1213                 {7, 7},
1214                 {0, 0}
1215                 }
1216         },
1217         {0, 1, 3, 0,            /* 0xa4 */
1218                 {{2, 2},
1219                 {5, 5},
1220                 {7, 7},
1221                 {0, 0}
1222                 }
1223         },
1224         {1, 1, 4, 0,            /* 0xa5 */
1225                 {{0, 0},
1226                 {2, 2},
1227                 {5, 5},
1228                 {7, 7}
1229                 }
1230         },
1231         {0, 1, 3, 0,            /* 0xa6 */
1232                 {{1, 2},
1233                 {5, 5},
1234                 {7, 7},
1235                 {0, 0}
1236                 }
1237         },
1238         {1, 1, 3, 0,            /* 0xa7 */
1239                 {{0, 2},
1240                 {5, 5},
1241                 {7, 7},
1242                 {0, 0}
1243                 }
1244         },
1245         {0, 1, 3, 0,            /* 0xa8 */
1246                 {{3, 3},
1247                 {5, 5},
1248                 {7, 7},
1249                 {0, 0}
1250                 }
1251         },
1252         {1, 1, 4, 0,            /* 0xa9 */
1253                 {{0, 0},
1254                 {3, 3},
1255                 {5, 5},
1256                 {7, 7}
1257                 }
1258         },
1259         {0, 1, 4, 0,            /* 0xaa */
1260                 {{1, 1},
1261                 {3, 3},
1262                 {5, 5},
1263                 {7, 7}
1264                 }
1265         },
1266         {1, 1, 4, 0,            /* 0xab */
1267                 {{0, 1},
1268                 {3, 3},
1269                 {5, 5},
1270                 {7, 7}
1271                 }
1272         },
1273         {0, 1, 3, 0,            /* 0xac */
1274                 {{2, 3},
1275                 {5, 5},
1276                 {7, 7},
1277                 {0, 0}
1278                 }
1279         },
1280         {1, 1, 4, 0,            /* 0xad */
1281                 {{0, 0},
1282                 {2, 3},
1283                 {5, 5},
1284                 {7, 7}
1285                 }
1286         },
1287         {0, 1, 3, 0,            /* 0xae */
1288                 {{1, 3},
1289                 {5, 5},
1290                 {7, 7},
1291                 {0, 0}
1292                 }
1293         },
1294         {1, 1, 3, 0,            /* 0xaf */
1295                 {{0, 3},
1296                 {5, 5},
1297                 {7, 7},
1298                 {0, 0}
1299                 }
1300         },
1301         {0, 1, 2, 0,            /* 0xb0 */
1302                 {{4, 5},
1303                 {7, 7},
1304                 {0, 0},
1305                 {0, 0}
1306                 }
1307         },
1308         {1, 1, 3, 0,            /* 0xb1 */
1309                 {{0, 0},
1310                 {4, 5},
1311                 {7, 7},
1312                 {0, 0}
1313                 }
1314         },
1315         {0, 1, 3, 0,            /* 0xb2 */
1316                 {{1, 1},
1317                 {4, 5},
1318                 {7, 7},
1319                 {0, 0}
1320                 }
1321         },
1322         {1, 1, 3, 0,            /* 0xb3 */
1323                 {{0, 1},
1324                 {4, 5},
1325                 {7, 7},
1326                 {0, 0}
1327                 }
1328         },
1329         {0, 1, 3, 0,            /* 0xb4 */
1330                 {{2, 2},
1331                 {4, 5},
1332                 {7, 7},
1333                 {0, 0}
1334                 }
1335         },
1336         {1, 1, 4, 0,            /* 0xb5 */
1337                 {{0, 0},
1338                 {2, 2},
1339                 {4, 5},
1340                 {7, 7}
1341                 }
1342         },
1343         {0, 1, 3, 0,            /* 0xb6 */
1344                 {{1, 2},
1345                 {4, 5},
1346                 {7, 7},
1347                 {0, 0}
1348                 }
1349         },
1350         {1, 1, 3, 0,            /* 0xb7 */
1351                 {{0, 2},
1352                 {4, 5},
1353                 {7, 7},
1354                 {0, 0}
1355                 }
1356         },
1357         {0, 1, 2, 0,            /* 0xb8 */
1358                 {{3, 5},
1359                 {7, 7},
1360                 {0, 0},
1361                 {0, 0}
1362                 }
1363         },
1364         {1, 1, 3, 0,            /* 0xb9 */
1365                 {{0, 0},
1366                 {3, 5},
1367                 {7, 7},
1368                 {0, 0}
1369                 }
1370         },
1371         {0, 1, 3, 0,            /* 0xba */
1372                 {{1, 1},
1373                 {3, 5},
1374                 {7, 7},
1375                 {0, 0}
1376                 }
1377         },
1378         {1, 1, 3, 0,            /* 0xbb */
1379                 {{0, 1},
1380                 {3, 5},
1381                 {7, 7},
1382                 {0, 0}
1383                 }
1384         },
1385         {0, 1, 2, 0,            /* 0xbc */
1386                 {{2, 5},
1387                 {7, 7},
1388                 {0, 0},
1389                 {0, 0}
1390                 }
1391         },
1392         {1, 1, 3, 0,            /* 0xbd */
1393                 {{0, 0},
1394                 {2, 5},
1395                 {7, 7},
1396                 {0, 0}
1397                 }
1398         },
1399         {0, 1, 2, 0,            /* 0xbe */
1400                 {{1, 5},
1401                 {7, 7},
1402                 {0, 0},
1403                 {0, 0}
1404                 }
1405         },
1406         {1, 1, 2, 0,            /* 0xbf */
1407                 {{0, 5},
1408                 {7, 7},
1409                 {0, 0},
1410                 {0, 0}
1411                 }
1412         },
1413         {0, 1, 1, 0,            /* 0xc0 */
1414                 {{6, 7},
1415                 {0, 0},
1416                 {0, 0},
1417                 {0, 0}
1418                 }
1419         },
1420         {1, 1, 2, 0,            /* 0xc1 */
1421                 {{0, 0},
1422                 {6, 7},
1423                 {0, 0},
1424                 {0, 0}
1425                 }
1426         },
1427         {0, 1, 2, 0,            /* 0xc2 */
1428                 {{1, 1},
1429                 {6, 7},
1430                 {0, 0},
1431                 {0, 0}
1432                 }
1433         },
1434         {1, 1, 2, 0,            /* 0xc3 */
1435                 {{0, 1},
1436                 {6, 7},
1437                 {0, 0},
1438                 {0, 0}
1439                 }
1440         },
1441         {0, 1, 2, 0,            /* 0xc4 */
1442                 {{2, 2},
1443                 {6, 7},
1444                 {0, 0},
1445                 {0, 0}
1446                 }
1447         },
1448         {1, 1, 3, 0,            /* 0xc5 */
1449                 {{0, 0},
1450                 {2, 2},
1451                 {6, 7},
1452                 {0, 0}
1453                 }
1454         },
1455         {0, 1, 2, 0,            /* 0xc6 */
1456                 {{1, 2},
1457                 {6, 7},
1458                 {0, 0},
1459                 {0, 0}
1460                 }
1461         },
1462         {1, 1, 2, 0,            /* 0xc7 */
1463                 {{0, 2},
1464                 {6, 7},
1465                 {0, 0},
1466                 {0, 0}
1467                 }
1468         },
1469         {0, 1, 2, 0,            /* 0xc8 */
1470                 {{3, 3},
1471                 {6, 7},
1472                 {0, 0},
1473                 {0, 0}
1474                 }
1475         },
1476         {1, 1, 3, 0,            /* 0xc9 */
1477                 {{0, 0},
1478                 {3, 3},
1479                 {6, 7},
1480                 {0, 0}
1481                 }
1482         },
1483         {0, 1, 3, 0,            /* 0xca */
1484                 {{1, 1},
1485                 {3, 3},
1486                 {6, 7},
1487                 {0, 0}
1488                 }
1489         },
1490         {1, 1, 3, 0,            /* 0xcb */
1491                 {{0, 1},
1492                 {3, 3},
1493                 {6, 7},
1494                 {0, 0}
1495                 }
1496         },
1497         {0, 1, 2, 0,            /* 0xcc */
1498                 {{2, 3},
1499                 {6, 7},
1500                 {0, 0},
1501                 {0, 0}
1502                 }
1503         },
1504         {1, 1, 3, 0,            /* 0xcd */
1505                 {{0, 0},
1506                 {2, 3},
1507                 {6, 7},
1508                 {0, 0}
1509                 }
1510         },
1511         {0, 1, 2, 0,            /* 0xce */
1512                 {{1, 3},
1513                 {6, 7},
1514                 {0, 0},
1515                 {0, 0}
1516                 }
1517         },
1518         {1, 1, 2, 0,            /* 0xcf */
1519                 {{0, 3},
1520                 {6, 7},
1521                 {0, 0},
1522                 {0, 0}
1523                 }
1524         },
1525         {0, 1, 2, 0,            /* 0xd0 */
1526                 {{4, 4},
1527                 {6, 7},
1528                 {0, 0},
1529                 {0, 0}
1530                 }
1531         },
1532         {1, 1, 3, 0,            /* 0xd1 */
1533                 {{0, 0},
1534                 {4, 4},
1535                 {6, 7},
1536                 {0, 0}
1537                 }
1538         },
1539         {0, 1, 3, 0,            /* 0xd2 */
1540                 {{1, 1},
1541                 {4, 4},
1542                 {6, 7},
1543                 {0, 0}
1544                 }
1545         },
1546         {1, 1, 3, 0,            /* 0xd3 */
1547                 {{0, 1},
1548                 {4, 4},
1549                 {6, 7},
1550                 {0, 0}
1551                 }
1552         },
1553         {0, 1, 3, 0,            /* 0xd4 */
1554                 {{2, 2},
1555                 {4, 4},
1556                 {6, 7},
1557                 {0, 0}
1558                 }
1559         },
1560         {1, 1, 4, 0,            /* 0xd5 */
1561                 {{0, 0},
1562                 {2, 2},
1563                 {4, 4},
1564                 {6, 7}
1565                 }
1566         },
1567         {0, 1, 3, 0,            /* 0xd6 */
1568                 {{1, 2},
1569                 {4, 4},
1570                 {6, 7},
1571                 {0, 0}
1572                 }
1573         },
1574         {1, 1, 3, 0,            /* 0xd7 */
1575                 {{0, 2},
1576                 {4, 4},
1577                 {6, 7},
1578                 {0, 0}
1579                 }
1580         },
1581         {0, 1, 2, 0,            /* 0xd8 */
1582                 {{3, 4},
1583                 {6, 7},
1584                 {0, 0},
1585                 {0, 0}
1586                 }
1587         },
1588         {1, 1, 3, 0,            /* 0xd9 */
1589                 {{0, 0},
1590                 {3, 4},
1591                 {6, 7},
1592                 {0, 0}
1593                 }
1594         },
1595         {0, 1, 3, 0,            /* 0xda */
1596                 {{1, 1},
1597                 {3, 4},
1598                 {6, 7},
1599                 {0, 0}
1600                 }
1601         },
1602         {1, 1, 3, 0,            /* 0xdb */
1603                 {{0, 1},
1604                 {3, 4},
1605                 {6, 7},
1606                 {0, 0}
1607                 }
1608         },
1609         {0, 1, 2, 0,            /* 0xdc */
1610                 {{2, 4},
1611                 {6, 7},
1612                 {0, 0},
1613                 {0, 0}
1614                 }
1615         },
1616         {1, 1, 3, 0,            /* 0xdd */
1617                 {{0, 0},
1618                 {2, 4},
1619                 {6, 7},
1620                 {0, 0}
1621                 }
1622         },
1623         {0, 1, 2, 0,            /* 0xde */
1624                 {{1, 4},
1625                 {6, 7},
1626                 {0, 0},
1627                 {0, 0}
1628                 }
1629         },
1630         {1, 1, 2, 0,            /* 0xdf */
1631                 {{0, 4},
1632                 {6, 7},
1633                 {0, 0},
1634                 {0, 0}
1635                 }
1636         },
1637         {0, 1, 1, 0,            /* 0xe0 */
1638                 {{5, 7},
1639                 {0, 0},
1640                 {0, 0},
1641                 {0, 0}
1642                 }
1643         },
1644         {1, 1, 2, 0,            /* 0xe1 */
1645                 {{0, 0},
1646                 {5, 7},
1647                 {0, 0},
1648                 {0, 0}
1649                 }
1650         },
1651         {0, 1, 2, 0,            /* 0xe2 */
1652                 {{1, 1},
1653                 {5, 7},
1654                 {0, 0},
1655                 {0, 0}
1656                 }
1657         },
1658         {1, 1, 2, 0,            /* 0xe3 */
1659                 {{0, 1},
1660                 {5, 7},
1661                 {0, 0},
1662                 {0, 0}
1663                 }
1664         },
1665         {0, 1, 2, 0,            /* 0xe4 */
1666                 {{2, 2},
1667                 {5, 7},
1668                 {0, 0},
1669                 {0, 0}
1670                 }
1671         },
1672         {1, 1, 3, 0,            /* 0xe5 */
1673                 {{0, 0},
1674                 {2, 2},
1675                 {5, 7},
1676                 {0, 0}
1677                 }
1678         },
1679         {0, 1, 2, 0,            /* 0xe6 */
1680                 {{1, 2},
1681                 {5, 7},
1682                 {0, 0},
1683                 {0, 0}
1684                 }
1685         },
1686         {1, 1, 2, 0,            /* 0xe7 */
1687                 {{0, 2},
1688                 {5, 7},
1689                 {0, 0},
1690                 {0, 0}
1691                 }
1692         },
1693         {0, 1, 2, 0,            /* 0xe8 */
1694                 {{3, 3},
1695                 {5, 7},
1696                 {0, 0},
1697                 {0, 0}
1698                 }
1699         },
1700         {1, 1, 3, 0,            /* 0xe9 */
1701                 {{0, 0},
1702                 {3, 3},
1703                 {5, 7},
1704                 {0, 0}
1705                 }
1706         },
1707         {0, 1, 3, 0,            /* 0xea */
1708                 {{1, 1},
1709                 {3, 3},
1710                 {5, 7},
1711                 {0, 0}
1712                 }
1713         },
1714         {1, 1, 3, 0,            /* 0xeb */
1715                 {{0, 1},
1716                 {3, 3},
1717                 {5, 7},
1718                 {0, 0}
1719                 }
1720         },
1721         {0, 1, 2, 0,            /* 0xec */
1722                 {{2, 3},
1723                 {5, 7},
1724                 {0, 0},
1725                 {0, 0}
1726                 }
1727         },
1728         {1, 1, 3, 0,            /* 0xed */
1729                 {{0, 0},
1730                 {2, 3},
1731                 {5, 7},
1732                 {0, 0}
1733                 }
1734         },
1735         {0, 1, 2, 0,            /* 0xee */
1736                 {{1, 3},
1737                 {5, 7},
1738                 {0, 0},
1739                 {0, 0}
1740                 }
1741         },
1742         {1, 1, 2, 0,            /* 0xef */
1743                 {{0, 3},
1744                 {5, 7},
1745                 {0, 0},
1746                 {0, 0}
1747                 }
1748         },
1749         {0, 1, 1, 0,            /* 0xf0 */
1750                 {{4, 7},
1751                 {0, 0},
1752                 {0, 0},
1753                 {0, 0}
1754                 }
1755         },
1756         {1, 1, 2, 0,            /* 0xf1 */
1757                 {{0, 0},
1758                 {4, 7},
1759                 {0, 0},
1760                 {0, 0}
1761                 }
1762         },
1763         {0, 1, 2, 0,            /* 0xf2 */
1764                 {{1, 1},
1765                 {4, 7},
1766                 {0, 0},
1767                 {0, 0}
1768                 }
1769         },
1770         {1, 1, 2, 0,            /* 0xf3 */
1771                 {{0, 1},
1772                 {4, 7},
1773                 {0, 0},
1774                 {0, 0}
1775                 }
1776         },
1777         {0, 1, 2, 0,            /* 0xf4 */
1778                 {{2, 2},
1779                 {4, 7},
1780                 {0, 0},
1781                 {0, 0}
1782                 }
1783         },
1784         {1, 1, 3, 0,            /* 0xf5 */
1785                 {{0, 0},
1786                 {2, 2},
1787                 {4, 7},
1788                 {0, 0}
1789                 }
1790         },
1791         {0, 1, 2, 0,            /* 0xf6 */
1792                 {{1, 2},
1793                 {4, 7},
1794                 {0, 0},
1795                 {0, 0}
1796                 }
1797         },
1798         {1, 1, 2, 0,            /* 0xf7 */
1799                 {{0, 2},
1800                 {4, 7},
1801                 {0, 0},
1802                 {0, 0}
1803                 }
1804         },
1805         {0, 1, 1, 0,            /* 0xf8 */
1806                 {{3, 7},
1807                 {0, 0},
1808                 {0, 0},
1809                 {0, 0}
1810                 }
1811         },
1812         {1, 1, 2, 0,            /* 0xf9 */
1813                 {{0, 0},
1814                 {3, 7},
1815                 {0, 0},
1816                 {0, 0}
1817                 }
1818         },
1819         {0, 1, 2, 0,            /* 0xfa */
1820                 {{1, 1},
1821                 {3, 7},
1822                 {0, 0},
1823                 {0, 0}
1824                 }
1825         },
1826         {1, 1, 2, 0,            /* 0xfb */
1827                 {{0, 1},
1828                 {3, 7},
1829                 {0, 0},
1830                 {0, 0}
1831                 }
1832         },
1833         {0, 1, 1, 0,            /* 0xfc */
1834                 {{2, 7},
1835                 {0, 0},
1836                 {0, 0},
1837                 {0, 0}
1838                 }
1839         },
1840         {1, 1, 2, 0,            /* 0xfd */
1841                 {{0, 0},
1842                 {2, 7},
1843                 {0, 0},
1844                 {0, 0}
1845                 }
1846         },
1847         {0, 1, 1, 0,            /* 0xfe */
1848                 {{1, 7},
1849                 {0, 0},
1850                 {0, 0},
1851                 {0, 0}
1852                 }
1853         },
1854         {1, 1, 1, 0,            /* 0xff */
1855                 {{0, 7},
1856                 {0, 0},
1857                 {0, 0},
1858                 {0, 0}
1859                 }
1860         }
1861 };
1862
1863
1864 int
1865 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1866     struct sctp_scoping *scope,
1867     int do_update)
1868 {
1869         if ((scope->loopback_scope == 0) &&
1870             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1871                 /*
1872                  * skip loopback if not in scope *
1873                  */
1874                 return (0);
1875         }
1876         switch (ifa->address.sa.sa_family) {
1877 #ifdef INET
1878         case AF_INET:
1879                 if (scope->ipv4_addr_legal) {
1880                         struct sockaddr_in *sin;
1881
1882                         sin = (struct sockaddr_in *)&ifa->address.sin;
1883                         if (sin->sin_addr.s_addr == 0) {
1884                                 /* not in scope , unspecified */
1885                                 return (0);
1886                         }
1887                         if ((scope->ipv4_local_scope == 0) &&
1888                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1889                                 /* private address not in scope */
1890                                 return (0);
1891                         }
1892                 } else {
1893                         return (0);
1894                 }
1895                 break;
1896 #endif
1897 #ifdef INET6
1898         case AF_INET6:
1899                 if (scope->ipv6_addr_legal) {
1900                         struct sockaddr_in6 *sin6;
1901
1902                         /*
1903                          * Must update the flags,  bummer, which means any
1904                          * IFA locks must now be applied HERE <->
1905                          */
1906                         if (do_update) {
1907                                 sctp_gather_internal_ifa_flags(ifa);
1908                         }
1909                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1910                                 return (0);
1911                         }
1912                         /* ok to use deprecated addresses? */
1913                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1914                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1915                                 /* skip unspecifed addresses */
1916                                 return (0);
1917                         }
1918                         if (    /* (local_scope == 0) && */
1919                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1920                                 return (0);
1921                         }
1922                         if ((scope->site_scope == 0) &&
1923                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1924                                 return (0);
1925                         }
1926                 } else {
1927                         return (0);
1928                 }
1929                 break;
1930 #endif
1931         default:
1932                 return (0);
1933         }
1934         return (1);
1935 }
1936
1937 static struct mbuf *
1938 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1939 {
1940         struct sctp_paramhdr *parmh;
1941         struct mbuf *mret;
1942         uint16_t plen;
1943
1944         switch (ifa->address.sa.sa_family) {
1945 #ifdef INET
1946         case AF_INET:
1947                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1948                 break;
1949 #endif
1950 #ifdef INET6
1951         case AF_INET6:
1952                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1953                 break;
1954 #endif
1955         default:
1956                 return (m);
1957         }
1958         if (M_TRAILINGSPACE(m) >= plen) {
1959                 /* easy side we just drop it on the end */
1960                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1961                 mret = m;
1962         } else {
1963                 /* Need more space */
1964                 mret = m;
1965                 while (SCTP_BUF_NEXT(mret) != NULL) {
1966                         mret = SCTP_BUF_NEXT(mret);
1967                 }
1968                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_DONTWAIT, 1, MT_DATA);
1969                 if (SCTP_BUF_NEXT(mret) == NULL) {
1970                         /* We are hosed, can't add more addresses */
1971                         return (m);
1972                 }
1973                 mret = SCTP_BUF_NEXT(mret);
1974                 parmh = mtod(mret, struct sctp_paramhdr *);
1975         }
1976         /* now add the parameter */
1977         switch (ifa->address.sa.sa_family) {
1978 #ifdef INET
1979         case AF_INET:
1980                 {
1981                         struct sctp_ipv4addr_param *ipv4p;
1982                         struct sockaddr_in *sin;
1983
1984                         sin = (struct sockaddr_in *)&ifa->address.sin;
1985                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1986                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1987                         parmh->param_length = htons(plen);
1988                         ipv4p->addr = sin->sin_addr.s_addr;
1989                         SCTP_BUF_LEN(mret) += plen;
1990                         break;
1991                 }
1992 #endif
1993 #ifdef INET6
1994         case AF_INET6:
1995                 {
1996                         struct sctp_ipv6addr_param *ipv6p;
1997                         struct sockaddr_in6 *sin6;
1998
1999                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2000                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2001                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2002                         parmh->param_length = htons(plen);
2003                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2004                             sizeof(ipv6p->addr));
2005                         /* clear embedded scope in the address */
2006                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2007                         SCTP_BUF_LEN(mret) += plen;
2008                         break;
2009                 }
2010 #endif
2011         default:
2012                 return (m);
2013         }
2014         if (len != NULL) {
2015                 *len += plen;
2016         }
2017         return (mret);
2018 }
2019
2020
2021 struct mbuf *
2022 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2023     struct sctp_scoping *scope,
2024     struct mbuf *m_at, int cnt_inits_to,
2025     uint16_t * padding_len, uint16_t * chunk_len)
2026 {
2027         struct sctp_vrf *vrf = NULL;
2028         int cnt, limit_out = 0, total_count;
2029         uint32_t vrf_id;
2030
2031         vrf_id = inp->def_vrf_id;
2032         SCTP_IPI_ADDR_RLOCK();
2033         vrf = sctp_find_vrf(vrf_id);
2034         if (vrf == NULL) {
2035                 SCTP_IPI_ADDR_RUNLOCK();
2036                 return (m_at);
2037         }
2038         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2039                 struct sctp_ifa *sctp_ifap;
2040                 struct sctp_ifn *sctp_ifnp;
2041
2042                 cnt = cnt_inits_to;
2043                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2044                         limit_out = 1;
2045                         cnt = SCTP_ADDRESS_LIMIT;
2046                         goto skip_count;
2047                 }
2048                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2049                         if ((scope->loopback_scope == 0) &&
2050                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2051                                 /*
2052                                  * Skip loopback devices if loopback_scope
2053                                  * not set
2054                                  */
2055                                 continue;
2056                         }
2057                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2058                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2059                                         continue;
2060                                 }
2061                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
2062                                         continue;
2063                                 }
2064                                 cnt++;
2065                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2066                                         break;
2067                                 }
2068                         }
2069                         if (cnt > SCTP_ADDRESS_LIMIT) {
2070                                 break;
2071                         }
2072                 }
2073 skip_count:
2074                 if (cnt > 1) {
2075                         total_count = 0;
2076                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2077                                 cnt = 0;
2078                                 if ((scope->loopback_scope == 0) &&
2079                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2080                                         /*
2081                                          * Skip loopback devices if
2082                                          * loopback_scope not set
2083                                          */
2084                                         continue;
2085                                 }
2086                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2087                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2088                                                 continue;
2089                                         }
2090                                         if (sctp_is_address_in_scope(sctp_ifap,
2091                                             scope, 0) == 0) {
2092                                                 continue;
2093                                         }
2094                                         if ((chunk_len != NULL) &&
2095                                             (padding_len != NULL) &&
2096                                             (*padding_len > 0)) {
2097                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2098                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2099                                                 *chunk_len += *padding_len;
2100                                                 *padding_len = 0;
2101                                         }
2102                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2103                                         if (limit_out) {
2104                                                 cnt++;
2105                                                 total_count++;
2106                                                 if (cnt >= 2) {
2107                                                         /*
2108                                                          * two from each
2109                                                          * address
2110                                                          */
2111                                                         break;
2112                                                 }
2113                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2114                                                         /* No more addresses */
2115                                                         break;
2116                                                 }
2117                                         }
2118                                 }
2119                         }
2120                 }
2121         } else {
2122                 struct sctp_laddr *laddr;
2123
2124                 cnt = cnt_inits_to;
2125                 /* First, how many ? */
2126                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2127                         if (laddr->ifa == NULL) {
2128                                 continue;
2129                         }
2130                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2131                                 /*
2132                                  * Address being deleted by the system, dont
2133                                  * list.
2134                                  */
2135                                 continue;
2136                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2137                                 /*
2138                                  * Address being deleted on this ep don't
2139                                  * list.
2140                                  */
2141                                 continue;
2142                         }
2143                         if (sctp_is_address_in_scope(laddr->ifa,
2144                             scope, 1) == 0) {
2145                                 continue;
2146                         }
2147                         cnt++;
2148                 }
2149                 /*
2150                  * To get through a NAT we only list addresses if we have
2151                  * more than one. That way if you just bind a single address
2152                  * we let the source of the init dictate our address.
2153                  */
2154                 if (cnt > 1) {
2155                         cnt = cnt_inits_to;
2156                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2157                                 if (laddr->ifa == NULL) {
2158                                         continue;
2159                                 }
2160                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2161                                         continue;
2162                                 }
2163                                 if (sctp_is_address_in_scope(laddr->ifa,
2164                                     scope, 0) == 0) {
2165                                         continue;
2166                                 }
2167                                 if ((chunk_len != NULL) &&
2168                                     (padding_len != NULL) &&
2169                                     (*padding_len > 0)) {
2170                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2171                                         SCTP_BUF_LEN(m_at) += *padding_len;
2172                                         *chunk_len += *padding_len;
2173                                         *padding_len = 0;
2174                                 }
2175                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2176                                 cnt++;
2177                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2178                                         break;
2179                                 }
2180                         }
2181                 }
2182         }
2183         SCTP_IPI_ADDR_RUNLOCK();
2184         return (m_at);
2185 }
2186
2187 static struct sctp_ifa *
2188 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2189     uint8_t dest_is_loop,
2190     uint8_t dest_is_priv,
2191     sa_family_t fam)
2192 {
2193         uint8_t dest_is_global = 0;
2194
2195         /* dest_is_priv is true if destination is a private address */
2196         /* dest_is_loop is true if destination is a loopback addresses */
2197
2198         /**
2199          * Here we determine if its a preferred address. A preferred address
2200          * means it is the same scope or higher scope then the destination.
2201          * L = loopback, P = private, G = global
2202          * -----------------------------------------
2203          *    src    |  dest | result
2204          *  ----------------------------------------
2205          *     L     |    L  |    yes
2206          *  -----------------------------------------
2207          *     P     |    L  |    yes-v4 no-v6
2208          *  -----------------------------------------
2209          *     G     |    L  |    yes-v4 no-v6
2210          *  -----------------------------------------
2211          *     L     |    P  |    no
2212          *  -----------------------------------------
2213          *     P     |    P  |    yes
2214          *  -----------------------------------------
2215          *     G     |    P  |    no
2216          *   -----------------------------------------
2217          *     L     |    G  |    no
2218          *   -----------------------------------------
2219          *     P     |    G  |    no
2220          *    -----------------------------------------
2221          *     G     |    G  |    yes
2222          *    -----------------------------------------
2223          */
2224
2225         if (ifa->address.sa.sa_family != fam) {
2226                 /* forget mis-matched family */
2227                 return (NULL);
2228         }
2229         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2230                 dest_is_global = 1;
2231         }
2232         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2233         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2234         /* Ok the address may be ok */
2235 #ifdef INET6
2236         if (fam == AF_INET6) {
2237                 /* ok to use deprecated addresses? no lets not! */
2238                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2239                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2240                         return (NULL);
2241                 }
2242                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2243                         if (dest_is_loop) {
2244                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2245                                 return (NULL);
2246                         }
2247                 }
2248                 if (ifa->src_is_glob) {
2249                         if (dest_is_loop) {
2250                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2251                                 return (NULL);
2252                         }
2253                 }
2254         }
2255 #endif
2256         /*
2257          * Now that we know what is what, implement or table this could in
2258          * theory be done slicker (it used to be), but this is
2259          * straightforward and easier to validate :-)
2260          */
2261         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2262             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2263         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2264             dest_is_loop, dest_is_priv, dest_is_global);
2265
2266         if ((ifa->src_is_loop) && (dest_is_priv)) {
2267                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2268                 return (NULL);
2269         }
2270         if ((ifa->src_is_glob) && (dest_is_priv)) {
2271                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2272                 return (NULL);
2273         }
2274         if ((ifa->src_is_loop) && (dest_is_global)) {
2275                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2276                 return (NULL);
2277         }
2278         if ((ifa->src_is_priv) && (dest_is_global)) {
2279                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2280                 return (NULL);
2281         }
2282         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2283         /* its a preferred address */
2284         return (ifa);
2285 }
2286
2287 static struct sctp_ifa *
2288 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2289     uint8_t dest_is_loop,
2290     uint8_t dest_is_priv,
2291     sa_family_t fam)
2292 {
2293         uint8_t dest_is_global = 0;
2294
2295         /**
2296          * Here we determine if its a acceptable address. A acceptable
2297          * address means it is the same scope or higher scope but we can
2298          * allow for NAT which means its ok to have a global dest and a
2299          * private src.
2300          *
2301          * L = loopback, P = private, G = global
2302          * -----------------------------------------
2303          *  src    |  dest | result
2304          * -----------------------------------------
2305          *   L     |   L   |    yes
2306          *  -----------------------------------------
2307          *   P     |   L   |    yes-v4 no-v6
2308          *  -----------------------------------------
2309          *   G     |   L   |    yes
2310          * -----------------------------------------
2311          *   L     |   P   |    no
2312          * -----------------------------------------
2313          *   P     |   P   |    yes
2314          * -----------------------------------------
2315          *   G     |   P   |    yes - May not work
2316          * -----------------------------------------
2317          *   L     |   G   |    no
2318          * -----------------------------------------
2319          *   P     |   G   |    yes - May not work
2320          * -----------------------------------------
2321          *   G     |   G   |    yes
2322          * -----------------------------------------
2323          */
2324
2325         if (ifa->address.sa.sa_family != fam) {
2326                 /* forget non matching family */
2327                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2328                     ifa->address.sa.sa_family, fam);
2329                 return (NULL);
2330         }
2331         /* Ok the address may be ok */
2332         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2333         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2334             dest_is_loop, dest_is_priv);
2335         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2336                 dest_is_global = 1;
2337         }
2338 #ifdef INET6
2339         if (fam == AF_INET6) {
2340                 /* ok to use deprecated addresses? */
2341                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2342                         return (NULL);
2343                 }
2344                 if (ifa->src_is_priv) {
2345                         /* Special case, linklocal to loop */
2346                         if (dest_is_loop)
2347                                 return (NULL);
2348                 }
2349         }
2350 #endif
2351         /*
2352          * Now that we know what is what, implement our table. This could in
2353          * theory be done slicker (it used to be), but this is
2354          * straightforward and easier to validate :-)
2355          */
2356         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2357             ifa->src_is_loop,
2358             dest_is_priv);
2359         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2360                 return (NULL);
2361         }
2362         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2363             ifa->src_is_loop,
2364             dest_is_global);
2365         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2366                 return (NULL);
2367         }
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2369         /* its an acceptable address */
2370         return (ifa);
2371 }
2372
2373 int
2374 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2375 {
2376         struct sctp_laddr *laddr;
2377
2378         if (stcb == NULL) {
2379                 /* There are no restrictions, no TCB :-) */
2380                 return (0);
2381         }
2382         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2383                 if (laddr->ifa == NULL) {
2384                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2385                             __FUNCTION__);
2386                         continue;
2387                 }
2388                 if (laddr->ifa == ifa) {
2389                         /* Yes it is on the list */
2390                         return (1);
2391                 }
2392         }
2393         return (0);
2394 }
2395
2396
2397 int
2398 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2399 {
2400         struct sctp_laddr *laddr;
2401
2402         if (ifa == NULL)
2403                 return (0);
2404         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2405                 if (laddr->ifa == NULL) {
2406                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2407                             __FUNCTION__);
2408                         continue;
2409                 }
2410                 if ((laddr->ifa == ifa) && laddr->action == 0)
2411                         /* same pointer */
2412                         return (1);
2413         }
2414         return (0);
2415 }
2416
2417
2418
2419 static struct sctp_ifa *
2420 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2421     sctp_route_t * ro,
2422     uint32_t vrf_id,
2423     int non_asoc_addr_ok,
2424     uint8_t dest_is_priv,
2425     uint8_t dest_is_loop,
2426     sa_family_t fam)
2427 {
2428         struct sctp_laddr *laddr, *starting_point;
2429         void *ifn;
2430         int resettotop = 0;
2431         struct sctp_ifn *sctp_ifn;
2432         struct sctp_ifa *sctp_ifa, *sifa;
2433         struct sctp_vrf *vrf;
2434         uint32_t ifn_index;
2435
2436         vrf = sctp_find_vrf(vrf_id);
2437         if (vrf == NULL)
2438                 return (NULL);
2439
2440         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2441         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2442         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2443         /*
2444          * first question, is the ifn we will emit on in our list, if so, we
2445          * want such an address. Note that we first looked for a preferred
2446          * address.
2447          */
2448         if (sctp_ifn) {
2449                 /* is a preferred one on the interface we route out? */
2450                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2451                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2452                             (non_asoc_addr_ok == 0))
2453                                 continue;
2454                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2455                             dest_is_loop,
2456                             dest_is_priv, fam);
2457                         if (sifa == NULL)
2458                                 continue;
2459                         if (sctp_is_addr_in_ep(inp, sifa)) {
2460                                 atomic_add_int(&sifa->refcount, 1);
2461                                 return (sifa);
2462                         }
2463                 }
2464         }
2465         /*
2466          * ok, now we now need to find one on the list of the addresses. We
2467          * can't get one on the emitting interface so let's find first a
2468          * preferred one. If not that an acceptable one otherwise... we
2469          * return NULL.
2470          */
2471         starting_point = inp->next_addr_touse;
2472 once_again:
2473         if (inp->next_addr_touse == NULL) {
2474                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2475                 resettotop = 1;
2476         }
2477         for (laddr = inp->next_addr_touse; laddr;
2478             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2479                 if (laddr->ifa == NULL) {
2480                         /* address has been removed */
2481                         continue;
2482                 }
2483                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2484                         /* address is being deleted */
2485                         continue;
2486                 }
2487                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2488                     dest_is_priv, fam);
2489                 if (sifa == NULL)
2490                         continue;
2491                 atomic_add_int(&sifa->refcount, 1);
2492                 return (sifa);
2493         }
2494         if (resettotop == 0) {
2495                 inp->next_addr_touse = NULL;
2496                 goto once_again;
2497         }
2498         inp->next_addr_touse = starting_point;
2499         resettotop = 0;
2500 once_again_too:
2501         if (inp->next_addr_touse == NULL) {
2502                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2503                 resettotop = 1;
2504         }
2505         /* ok, what about an acceptable address in the inp */
2506         for (laddr = inp->next_addr_touse; laddr;
2507             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2508                 if (laddr->ifa == NULL) {
2509                         /* address has been removed */
2510                         continue;
2511                 }
2512                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2513                         /* address is being deleted */
2514                         continue;
2515                 }
2516                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2517                     dest_is_priv, fam);
2518                 if (sifa == NULL)
2519                         continue;
2520                 atomic_add_int(&sifa->refcount, 1);
2521                 return (sifa);
2522         }
2523         if (resettotop == 0) {
2524                 inp->next_addr_touse = NULL;
2525                 goto once_again_too;
2526         }
2527         /*
2528          * no address bound can be a source for the destination we are in
2529          * trouble
2530          */
2531         return (NULL);
2532 }
2533
2534
2535
2536 static struct sctp_ifa *
2537 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2538     struct sctp_tcb *stcb,
2539     sctp_route_t * ro,
2540     uint32_t vrf_id,
2541     uint8_t dest_is_priv,
2542     uint8_t dest_is_loop,
2543     int non_asoc_addr_ok,
2544     sa_family_t fam)
2545 {
2546         struct sctp_laddr *laddr, *starting_point;
2547         void *ifn;
2548         struct sctp_ifn *sctp_ifn;
2549         struct sctp_ifa *sctp_ifa, *sifa;
2550         uint8_t start_at_beginning = 0;
2551         struct sctp_vrf *vrf;
2552         uint32_t ifn_index;
2553
2554         /*
2555          * first question, is the ifn we will emit on in our list, if so, we
2556          * want that one.
2557          */
2558         vrf = sctp_find_vrf(vrf_id);
2559         if (vrf == NULL)
2560                 return (NULL);
2561
2562         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2563         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2564         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2565
2566         /*
2567          * first question, is the ifn we will emit on in our list?  If so,
2568          * we want that one. First we look for a preferred. Second, we go
2569          * for an acceptable.
2570          */
2571         if (sctp_ifn) {
2572                 /* first try for a preferred address on the ep */
2573                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2574                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2575                                 continue;
2576                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2577                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2578                                 if (sifa == NULL)
2579                                         continue;
2580                                 if (((non_asoc_addr_ok == 0) &&
2581                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2582                                     (non_asoc_addr_ok &&
2583                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2584                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2585                                         /* on the no-no list */
2586                                         continue;
2587                                 }
2588                                 atomic_add_int(&sifa->refcount, 1);
2589                                 return (sifa);
2590                         }
2591                 }
2592                 /* next try for an acceptable address on the ep */
2593                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2594                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2595                                 continue;
2596                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2597                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2598                                 if (sifa == NULL)
2599                                         continue;
2600                                 if (((non_asoc_addr_ok == 0) &&
2601                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2602                                     (non_asoc_addr_ok &&
2603                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2604                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2605                                         /* on the no-no list */
2606                                         continue;
2607                                 }
2608                                 atomic_add_int(&sifa->refcount, 1);
2609                                 return (sifa);
2610                         }
2611                 }
2612
2613         }
2614         /*
2615          * if we can't find one like that then we must look at all addresses
2616          * bound to pick one at first preferable then secondly acceptable.
2617          */
2618         starting_point = stcb->asoc.last_used_address;
2619 sctp_from_the_top:
2620         if (stcb->asoc.last_used_address == NULL) {
2621                 start_at_beginning = 1;
2622                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2623         }
2624         /* search beginning with the last used address */
2625         for (laddr = stcb->asoc.last_used_address; laddr;
2626             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2627                 if (laddr->ifa == NULL) {
2628                         /* address has been removed */
2629                         continue;
2630                 }
2631                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2632                         /* address is being deleted */
2633                         continue;
2634                 }
2635                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2636                 if (sifa == NULL)
2637                         continue;
2638                 if (((non_asoc_addr_ok == 0) &&
2639                     (sctp_is_addr_restricted(stcb, sifa))) ||
2640                     (non_asoc_addr_ok &&
2641                     (sctp_is_addr_restricted(stcb, sifa)) &&
2642                     (!sctp_is_addr_pending(stcb, sifa)))) {
2643                         /* on the no-no list */
2644                         continue;
2645                 }
2646                 stcb->asoc.last_used_address = laddr;
2647                 atomic_add_int(&sifa->refcount, 1);
2648                 return (sifa);
2649         }
2650         if (start_at_beginning == 0) {
2651                 stcb->asoc.last_used_address = NULL;
2652                 goto sctp_from_the_top;
2653         }
2654         /* now try for any higher scope than the destination */
2655         stcb->asoc.last_used_address = starting_point;
2656         start_at_beginning = 0;
2657 sctp_from_the_top2:
2658         if (stcb->asoc.last_used_address == NULL) {
2659                 start_at_beginning = 1;
2660                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2661         }
2662         /* search beginning with the last used address */
2663         for (laddr = stcb->asoc.last_used_address; laddr;
2664             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2665                 if (laddr->ifa == NULL) {
2666                         /* address has been removed */
2667                         continue;
2668                 }
2669                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2670                         /* address is being deleted */
2671                         continue;
2672                 }
2673                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2674                     dest_is_priv, fam);
2675                 if (sifa == NULL)
2676                         continue;
2677                 if (((non_asoc_addr_ok == 0) &&
2678                     (sctp_is_addr_restricted(stcb, sifa))) ||
2679                     (non_asoc_addr_ok &&
2680                     (sctp_is_addr_restricted(stcb, sifa)) &&
2681                     (!sctp_is_addr_pending(stcb, sifa)))) {
2682                         /* on the no-no list */
2683                         continue;
2684                 }
2685                 stcb->asoc.last_used_address = laddr;
2686                 atomic_add_int(&sifa->refcount, 1);
2687                 return (sifa);
2688         }
2689         if (start_at_beginning == 0) {
2690                 stcb->asoc.last_used_address = NULL;
2691                 goto sctp_from_the_top2;
2692         }
2693         return (NULL);
2694 }
2695
2696 static struct sctp_ifa *
2697 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2698     struct sctp_tcb *stcb,
2699     int non_asoc_addr_ok,
2700     uint8_t dest_is_loop,
2701     uint8_t dest_is_priv,
2702     int addr_wanted,
2703     sa_family_t fam,
2704     sctp_route_t * ro
2705 )
2706 {
2707         struct sctp_ifa *ifa, *sifa;
2708         int num_eligible_addr = 0;
2709
2710 #ifdef INET6
2711         struct sockaddr_in6 sin6, lsa6;
2712
2713         if (fam == AF_INET6) {
2714                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2715                 (void)sa6_recoverscope(&sin6);
2716         }
2717 #endif                          /* INET6 */
2718         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2719                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2720                     (non_asoc_addr_ok == 0))
2721                         continue;
2722                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2723                     dest_is_priv, fam);
2724                 if (sifa == NULL)
2725                         continue;
2726 #ifdef INET6
2727                 if (fam == AF_INET6 &&
2728                     dest_is_loop &&
2729                     sifa->src_is_loop && sifa->src_is_priv) {
2730                         /*
2731                          * don't allow fe80::1 to be a src on loop ::1, we
2732                          * don't list it to the peer so we will get an
2733                          * abort.
2734                          */
2735                         continue;
2736                 }
2737                 if (fam == AF_INET6 &&
2738                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2739                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2740                         /*
2741                          * link-local <-> link-local must belong to the same
2742                          * scope.
2743                          */
2744                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2745                         (void)sa6_recoverscope(&lsa6);
2746                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2747                                 continue;
2748                         }
2749                 }
2750 #endif                          /* INET6 */
2751
2752                 /*
2753                  * Check if the IPv6 address matches to next-hop. In the
2754                  * mobile case, old IPv6 address may be not deleted from the
2755                  * interface. Then, the interface has previous and new
2756                  * addresses.  We should use one corresponding to the
2757                  * next-hop.  (by micchie)
2758                  */
2759 #ifdef INET6
2760                 if (stcb && fam == AF_INET6 &&
2761                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2762                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2763                             == 0) {
2764                                 continue;
2765                         }
2766                 }
2767 #endif
2768 #ifdef INET
2769                 /* Avoid topologically incorrect IPv4 address */
2770                 if (stcb && fam == AF_INET &&
2771                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2772                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2773                                 continue;
2774                         }
2775                 }
2776 #endif
2777                 if (stcb) {
2778                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2779                                 continue;
2780                         }
2781                         if (((non_asoc_addr_ok == 0) &&
2782                             (sctp_is_addr_restricted(stcb, sifa))) ||
2783                             (non_asoc_addr_ok &&
2784                             (sctp_is_addr_restricted(stcb, sifa)) &&
2785                             (!sctp_is_addr_pending(stcb, sifa)))) {
2786                                 /*
2787                                  * It is restricted for some reason..
2788                                  * probably not yet added.
2789                                  */
2790                                 continue;
2791                         }
2792                 }
2793                 if (num_eligible_addr >= addr_wanted) {
2794                         return (sifa);
2795                 }
2796                 num_eligible_addr++;
2797         }
2798         return (NULL);
2799 }
2800
2801
2802 static int
2803 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2804     struct sctp_tcb *stcb,
2805     int non_asoc_addr_ok,
2806     uint8_t dest_is_loop,
2807     uint8_t dest_is_priv,
2808     sa_family_t fam)
2809 {
2810         struct sctp_ifa *ifa, *sifa;
2811         int num_eligible_addr = 0;
2812
2813         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2814                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2815                     (non_asoc_addr_ok == 0)) {
2816                         continue;
2817                 }
2818                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2819                     dest_is_priv, fam);
2820                 if (sifa == NULL) {
2821                         continue;
2822                 }
2823                 if (stcb) {
2824                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
2825                                 continue;
2826                         }
2827                         if (((non_asoc_addr_ok == 0) &&
2828                             (sctp_is_addr_restricted(stcb, sifa))) ||
2829                             (non_asoc_addr_ok &&
2830                             (sctp_is_addr_restricted(stcb, sifa)) &&
2831                             (!sctp_is_addr_pending(stcb, sifa)))) {
2832                                 /*
2833                                  * It is restricted for some reason..
2834                                  * probably not yet added.
2835                                  */
2836                                 continue;
2837                         }
2838                 }
2839                 num_eligible_addr++;
2840         }
2841         return (num_eligible_addr);
2842 }
2843
2844 static struct sctp_ifa *
2845 sctp_choose_boundall(struct sctp_tcb *stcb,
2846     struct sctp_nets *net,
2847     sctp_route_t * ro,
2848     uint32_t vrf_id,
2849     uint8_t dest_is_priv,
2850     uint8_t dest_is_loop,
2851     int non_asoc_addr_ok,
2852     sa_family_t fam)
2853 {
2854         int cur_addr_num = 0, num_preferred = 0;
2855         void *ifn;
2856         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2857         struct sctp_ifa *sctp_ifa, *sifa;
2858         uint32_t ifn_index;
2859         struct sctp_vrf *vrf;
2860
2861 #ifdef INET
2862         int retried = 0;
2863
2864 #endif
2865
2866         /*-
2867          * For boundall we can use any address in the association.
2868          * If non_asoc_addr_ok is set we can use any address (at least in
2869          * theory). So we look for preferred addresses first. If we find one,
2870          * we use it. Otherwise we next try to get an address on the
2871          * interface, which we should be able to do (unless non_asoc_addr_ok
2872          * is false and we are routed out that way). In these cases where we
2873          * can't use the address of the interface we go through all the
2874          * ifn's looking for an address we can use and fill that in. Punting
2875          * means we send back address 0, which will probably cause problems
2876          * actually since then IP will fill in the address of the route ifn,
2877          * which means we probably already rejected it.. i.e. here comes an
2878          * abort :-<.
2879          */
2880         vrf = sctp_find_vrf(vrf_id);
2881         if (vrf == NULL)
2882                 return (NULL);
2883
2884         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2885         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2886         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2887         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2888         if (sctp_ifn == NULL) {
2889                 /* ?? We don't have this guy ?? */
2890                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2891                 goto bound_all_plan_b;
2892         }
2893         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2894             ifn_index, sctp_ifn->ifn_name);
2895
2896         if (net) {
2897                 cur_addr_num = net->indx_of_eligible_next_to_use;
2898         }
2899         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2900             stcb,
2901             non_asoc_addr_ok,
2902             dest_is_loop,
2903             dest_is_priv, fam);
2904         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2905             num_preferred, sctp_ifn->ifn_name);
2906         if (num_preferred == 0) {
2907                 /*
2908                  * no eligible addresses, we must use some other interface
2909                  * address if we can find one.
2910                  */
2911                 goto bound_all_plan_b;
2912         }
2913         /*
2914          * Ok we have num_eligible_addr set with how many we can use, this
2915          * may vary from call to call due to addresses being deprecated
2916          * etc..
2917          */
2918         if (cur_addr_num >= num_preferred) {
2919                 cur_addr_num = 0;
2920         }
2921         /*
2922          * select the nth address from the list (where cur_addr_num is the
2923          * nth) and 0 is the first one, 1 is the second one etc...
2924          */
2925         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2926
2927         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2928             dest_is_priv, cur_addr_num, fam, ro);
2929
2930         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2931         if (sctp_ifa) {
2932                 atomic_add_int(&sctp_ifa->refcount, 1);
2933                 if (net) {
2934                         /* save off where the next one we will want */
2935                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2936                 }
2937                 return (sctp_ifa);
2938         }
2939         /*
2940          * plan_b: Look at all interfaces and find a preferred address. If
2941          * no preferred fall through to plan_c.
2942          */
2943 bound_all_plan_b:
2944         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2945         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2946                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2947                     sctp_ifn->ifn_name);
2948                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2949                         /* wrong base scope */
2950                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2951                         continue;
2952                 }
2953                 if ((sctp_ifn == looked_at) && looked_at) {
2954                         /* already looked at this guy */
2955                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2956                         continue;
2957                 }
2958                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2959                     dest_is_loop, dest_is_priv, fam);
2960                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2961                     "Found ifn:%p %d preferred source addresses\n",
2962                     ifn, num_preferred);
2963                 if (num_preferred == 0) {
2964                         /* None on this interface. */
2965                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2966                         continue;
2967                 }
2968                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2969                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2970                     num_preferred, (void *)sctp_ifn, cur_addr_num);
2971
2972                 /*
2973                  * Ok we have num_eligible_addr set with how many we can
2974                  * use, this may vary from call to call due to addresses
2975                  * being deprecated etc..
2976                  */
2977                 if (cur_addr_num >= num_preferred) {
2978                         cur_addr_num = 0;
2979                 }
2980                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2981                     dest_is_priv, cur_addr_num, fam, ro);
2982                 if (sifa == NULL)
2983                         continue;
2984                 if (net) {
2985                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2986                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
2987                             cur_addr_num);
2988                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
2989                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
2990                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
2991                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
2992                 }
2993                 atomic_add_int(&sifa->refcount, 1);
2994                 return (sifa);
2995         }
2996 #ifdef INET
2997 again_with_private_addresses_allowed:
2998 #endif
2999         /* plan_c: do we have an acceptable address on the emit interface */
3000         sifa = NULL;
3001         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3002         if (emit_ifn == NULL) {
3003                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3004                 goto plan_d;
3005         }
3006         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3007                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3008                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3009                     (non_asoc_addr_ok == 0)) {
3010                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3011                         continue;
3012                 }
3013                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3014                     dest_is_priv, fam);
3015                 if (sifa == NULL) {
3016                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3017                         continue;
3018                 }
3019                 if (stcb) {
3020                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3021                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3022                                 sifa = NULL;
3023                                 continue;
3024                         }
3025                         if (((non_asoc_addr_ok == 0) &&
3026                             (sctp_is_addr_restricted(stcb, sifa))) ||
3027                             (non_asoc_addr_ok &&
3028                             (sctp_is_addr_restricted(stcb, sifa)) &&
3029                             (!sctp_is_addr_pending(stcb, sifa)))) {
3030                                 /*
3031                                  * It is restricted for some reason..
3032                                  * probably not yet added.
3033                                  */
3034                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3035                                 sifa = NULL;
3036                                 continue;
3037                         }
3038                 } else {
3039                         SCTP_PRINTF("Stcb is null - no print\n");
3040                 }
3041                 atomic_add_int(&sifa->refcount, 1);
3042                 goto out;
3043         }
3044 plan_d:
3045         /*
3046          * plan_d: We are in trouble. No preferred address on the emit
3047          * interface. And not even a preferred address on all interfaces. Go
3048          * out and see if we can find an acceptable address somewhere
3049          * amongst all interfaces.
3050          */
3051         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3052         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3053                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3054                         /* wrong base scope */
3055                         continue;
3056                 }
3057                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3058                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3059                             (non_asoc_addr_ok == 0))
3060                                 continue;
3061                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3062                             dest_is_loop,
3063                             dest_is_priv, fam);
3064                         if (sifa == NULL)
3065                                 continue;
3066                         if (stcb) {
3067                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
3068                                         sifa = NULL;
3069                                         continue;
3070                                 }
3071                                 if (((non_asoc_addr_ok == 0) &&
3072                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3073                                     (non_asoc_addr_ok &&
3074                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3075                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3076                                         /*
3077                                          * It is restricted for some
3078                                          * reason.. probably not yet added.
3079                                          */
3080                                         sifa = NULL;
3081                                         continue;
3082                                 }
3083                         }
3084                         goto out;
3085                 }
3086         }
3087 #ifdef INET
3088         if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
3089                 stcb->asoc.scope.ipv4_local_scope = 1;
3090                 retried = 1;
3091                 goto again_with_private_addresses_allowed;
3092         } else if (retried == 1) {
3093                 stcb->asoc.scope.ipv4_local_scope = 0;
3094         }
3095 #endif
3096 out:
3097 #ifdef INET
3098         if (sifa) {
3099                 if (retried == 1) {
3100                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3101                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3102                                         /* wrong base scope */
3103                                         continue;
3104                                 }
3105                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3106                                         struct sctp_ifa *tmp_sifa;
3107
3108                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3109                                             (non_asoc_addr_ok == 0))
3110                                                 continue;
3111                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3112                                             dest_is_loop,
3113                                             dest_is_priv, fam);
3114                                         if (tmp_sifa == NULL) {
3115                                                 continue;
3116                                         }
3117                                         if (tmp_sifa == sifa) {
3118                                                 continue;
3119                                         }
3120                                         if (stcb) {
3121                                                 if (sctp_is_address_in_scope(tmp_sifa,
3122                                                     &stcb->asoc.scope, 0) == 0) {
3123                                                         continue;
3124                                                 }
3125                                                 if (((non_asoc_addr_ok == 0) &&
3126                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3127                                                     (non_asoc_addr_ok &&
3128                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3129                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3130                                                         /*
3131                                                          * It is restricted
3132                                                          * for some reason..
3133                                                          * probably not yet
3134                                                          * added.
3135                                                          */
3136                                                         continue;
3137                                                 }
3138                                         }
3139                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3140                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3141                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3142                                         }
3143                                 }
3144                         }
3145                 }
3146                 atomic_add_int(&sifa->refcount, 1);
3147         }
3148 #endif
3149         return (sifa);
3150 }
3151
3152
3153
3154 /* tcb may be NULL */
3155 struct sctp_ifa *
3156 sctp_source_address_selection(struct sctp_inpcb *inp,
3157     struct sctp_tcb *stcb,
3158     sctp_route_t * ro,
3159     struct sctp_nets *net,
3160     int non_asoc_addr_ok, uint32_t vrf_id)
3161 {
3162         struct sctp_ifa *answer;
3163         uint8_t dest_is_priv, dest_is_loop;
3164         sa_family_t fam;
3165
3166 #ifdef INET
3167         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3168
3169 #endif
3170 #ifdef INET6
3171         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3172
3173 #endif
3174
3175         /**
3176          * Rules: - Find the route if needed, cache if I can. - Look at
3177          * interface address in route, Is it in the bound list. If so we
3178          * have the best source. - If not we must rotate amongst the
3179          * addresses.
3180          *
3181          * Cavets and issues
3182          *
3183          * Do we need to pay attention to scope. We can have a private address
3184          * or a global address we are sourcing or sending to. So if we draw
3185          * it out
3186          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3187          * For V4
3188          * ------------------------------------------
3189          *      source     *      dest  *  result
3190          * -----------------------------------------
3191          * <a>  Private    *    Global  *  NAT
3192          * -----------------------------------------
3193          * <b>  Private    *    Private *  No problem
3194          * -----------------------------------------
3195          * <c>  Global     *    Private *  Huh, How will this work?
3196          * -----------------------------------------
3197          * <d>  Global     *    Global  *  No Problem
3198          *------------------------------------------
3199          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3200          * For V6
3201          *------------------------------------------
3202          *      source     *      dest  *  result
3203          * -----------------------------------------
3204          * <a>  Linklocal  *    Global  *
3205          * -----------------------------------------
3206          * <b>  Linklocal  * Linklocal  *  No problem
3207          * -----------------------------------------
3208          * <c>  Global     * Linklocal  *  Huh, How will this work?
3209          * -----------------------------------------
3210          * <d>  Global     *    Global  *  No Problem
3211          *------------------------------------------
3212          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3213          *
3214          * And then we add to that what happens if there are multiple addresses
3215          * assigned to an interface. Remember the ifa on a ifn is a linked
3216          * list of addresses. So one interface can have more than one IP
3217          * address. What happens if we have both a private and a global
3218          * address? Do we then use context of destination to sort out which
3219          * one is best? And what about NAT's sending P->G may get you a NAT
3220          * translation, or should you select the G thats on the interface in
3221          * preference.
3222          *
3223          * Decisions:
3224          *
3225          * - count the number of addresses on the interface.
3226          * - if it is one, no problem except case <c>.
3227          *   For <a> we will assume a NAT out there.
3228          * - if there are more than one, then we need to worry about scope P
3229          *   or G. We should prefer G -> G and P -> P if possible.
3230          *   Then as a secondary fall back to mixed types G->P being a last
3231          *   ditch one.
3232          * - The above all works for bound all, but bound specific we need to
3233          *   use the same concept but instead only consider the bound
3234          *   addresses. If the bound set is NOT assigned to the interface then
3235          *   we must use rotation amongst the bound addresses..
3236          */
3237         if (ro->ro_rt == NULL) {
3238                 /*
3239                  * Need a route to cache.
3240                  */
3241                 SCTP_RTALLOC(ro, vrf_id);
3242         }
3243         if (ro->ro_rt == NULL) {
3244                 return (NULL);
3245         }
3246         fam = ro->ro_dst.sa_family;
3247         dest_is_priv = dest_is_loop = 0;
3248         /* Setup our scopes for the destination */
3249         switch (fam) {
3250 #ifdef INET
3251         case AF_INET:
3252                 /* Scope based on outbound address */
3253                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3254                         dest_is_loop = 1;
3255                         if (net != NULL) {
3256                                 /* mark it as local */
3257                                 net->addr_is_local = 1;
3258                         }
3259                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3260                         dest_is_priv = 1;
3261                 }
3262                 break;
3263 #endif
3264 #ifdef INET6
3265         case AF_INET6:
3266                 /* Scope based on outbound address */
3267                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3268                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3269                         /*
3270                          * If the address is a loopback address, which
3271                          * consists of "::1" OR "fe80::1%lo0", we are
3272                          * loopback scope. But we don't use dest_is_priv
3273                          * (link local addresses).
3274                          */
3275                         dest_is_loop = 1;
3276                         if (net != NULL) {
3277                                 /* mark it as local */
3278                                 net->addr_is_local = 1;
3279                         }
3280                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3281                         dest_is_priv = 1;
3282                 }
3283                 break;
3284 #endif
3285         }
3286         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3287         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3288         SCTP_IPI_ADDR_RLOCK();
3289         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3290                 /*
3291                  * Bound all case
3292                  */
3293                 answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3294                     dest_is_priv, dest_is_loop,
3295                     non_asoc_addr_ok, fam);
3296                 SCTP_IPI_ADDR_RUNLOCK();
3297                 return (answer);
3298         }
3299         /*
3300          * Subset bound case
3301          */
3302         if (stcb) {
3303                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3304                     vrf_id, dest_is_priv,
3305                     dest_is_loop,
3306                     non_asoc_addr_ok, fam);
3307         } else {
3308                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3309                     non_asoc_addr_ok,
3310                     dest_is_priv,
3311                     dest_is_loop, fam);
3312         }
3313         SCTP_IPI_ADDR_RUNLOCK();
3314         return (answer);
3315 }
3316
3317 static int
3318 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3319 {
3320         struct cmsghdr cmh;
3321         int tlen, at, found;
3322         struct sctp_sndinfo sndinfo;
3323         struct sctp_prinfo prinfo;
3324         struct sctp_authinfo authinfo;
3325
3326         tlen = SCTP_BUF_LEN(control);
3327         at = 0;
3328         found = 0;
3329         /*
3330          * Independent of how many mbufs, find the c_type inside the control
3331          * structure and copy out the data.
3332          */
3333         while (at < tlen) {
3334                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3335                         /* There is not enough room for one more. */
3336                         return (found);
3337                 }
3338                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3339                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3340                         /* We dont't have a complete CMSG header. */
3341                         return (found);
3342                 }
3343                 if (((int)cmh.cmsg_len + at) > tlen) {
3344                         /* We don't have the complete CMSG. */
3345                         return (found);
3346                 }
3347                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3348                     ((c_type == cmh.cmsg_type) ||
3349                     ((c_type == SCTP_SNDRCV) &&
3350                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3351                     (cmh.cmsg_type == SCTP_PRINFO) ||
3352                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3353                         if (c_type == cmh.cmsg_type) {
3354                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3355                                         return (found);
3356                                 }
3357                                 /* It is exactly what we want. Copy it out. */
3358                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3359                                 return (1);
3360                         } else {
3361                                 struct sctp_sndrcvinfo *sndrcvinfo;
3362
3363                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3364                                 if (found == 0) {
3365                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3366                                                 return (found);
3367                                         }
3368                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3369                                 }
3370                                 switch (cmh.cmsg_type) {
3371                                 case SCTP_SNDINFO:
3372                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3373                                                 return (found);
3374                                         }
3375                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3376                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3377                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3378                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3379                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3380                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3381                                         break;
3382                                 case SCTP_PRINFO:
3383                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3384                                                 return (found);
3385                                         }
3386                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3387                                         sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3388                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3389                                         break;
3390                                 case SCTP_AUTHINFO:
3391                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3392                                                 return (found);
3393                                         }
3394                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3395                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3396                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3397                                         break;
3398                                 default:
3399                                         return (found);
3400                                 }
3401                                 found = 1;
3402                         }
3403                 }
3404                 at += CMSG_ALIGN(cmh.cmsg_len);
3405         }
3406         return (found);
3407 }
3408
3409 static int
3410 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3411 {
3412         struct cmsghdr cmh;
3413         int tlen, at;
3414         struct sctp_initmsg initmsg;
3415
3416 #ifdef INET
3417         struct sockaddr_in sin;
3418
3419 #endif
3420 #ifdef INET6
3421         struct sockaddr_in6 sin6;
3422
3423 #endif
3424
3425         tlen = SCTP_BUF_LEN(control);
3426         at = 0;
3427         while (at < tlen) {
3428                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3429                         /* There is not enough room for one more. */
3430                         *error = EINVAL;
3431                         return (1);
3432                 }
3433                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3434                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3435                         /* We dont't have a complete CMSG header. */
3436                         *error = EINVAL;
3437                         return (1);
3438                 }
3439                 if (((int)cmh.cmsg_len + at) > tlen) {
3440                         /* We don't have the complete CMSG. */
3441                         *error = EINVAL;
3442                         return (1);
3443                 }
3444                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3445                         switch (cmh.cmsg_type) {
3446                         case SCTP_INIT:
3447                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3448                                         *error = EINVAL;
3449                                         return (1);
3450                                 }
3451                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3452                                 if (initmsg.sinit_max_attempts)
3453                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3454                                 if (initmsg.sinit_num_ostreams)
3455                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3456                                 if (initmsg.sinit_max_instreams)
3457                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3458                                 if (initmsg.sinit_max_init_timeo)
3459                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3460                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3461                                         struct sctp_stream_out *tmp_str;
3462                                         unsigned int i;
3463
3464                                         /* Default is NOT correct */
3465                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3466                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3467                                         SCTP_TCB_UNLOCK(stcb);
3468                                         SCTP_MALLOC(tmp_str,
3469                                             struct sctp_stream_out *,
3470                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3471                                             SCTP_M_STRMO);
3472                                         SCTP_TCB_LOCK(stcb);
3473                                         if (tmp_str != NULL) {
3474                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3475                                                 stcb->asoc.strmout = tmp_str;
3476                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3477                                         } else {
3478                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3479                                         }
3480                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3481                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3482                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3483                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3484                                                 stcb->asoc.strmout[i].stream_no = i;
3485                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3486                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3487                                         }
3488                                 }
3489                                 break;
3490 #ifdef INET
3491                         case SCTP_DSTADDRV4:
3492                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3493                                         *error = EINVAL;
3494                                         return (1);
3495                                 }
3496                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3497                                 sin.sin_family = AF_INET;
3498                                 sin.sin_len = sizeof(struct sockaddr_in);
3499                                 sin.sin_port = stcb->rport;
3500                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3501                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3502                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3503                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3504                                         *error = EINVAL;
3505                                         return (1);
3506                                 }
3507                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3508                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3509                                         *error = ENOBUFS;
3510                                         return (1);
3511                                 }
3512                                 break;
3513 #endif
3514 #ifdef INET6
3515                         case SCTP_DSTADDRV6:
3516                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3517                                         *error = EINVAL;
3518                                         return (1);
3519                                 }
3520                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3521                                 sin6.sin6_family = AF_INET6;
3522                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3523                                 sin6.sin6_port = stcb->rport;
3524                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3525                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3526                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3527                                         *error = EINVAL;
3528                                         return (1);
3529                                 }
3530 #ifdef INET
3531                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3532                                         in6_sin6_2_sin(&sin, &sin6);
3533                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3534                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3535                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3536                                                 *error = EINVAL;
3537                                                 return (1);
3538                                         }
3539                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3540                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3541                                                 *error = ENOBUFS;
3542                                                 return (1);
3543                                         }
3544                                 } else
3545 #endif
3546                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3547                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3548                                         *error = ENOBUFS;
3549                                         return (1);
3550                                 }
3551                                 break;
3552 #endif
3553                         default:
3554                                 break;
3555                         }
3556                 }
3557                 at += CMSG_ALIGN(cmh.cmsg_len);
3558         }
3559         return (0);
3560 }
3561
3562 static struct sctp_tcb *
3563 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3564     in_port_t port,
3565     struct mbuf *control,
3566     struct sctp_nets **net_p,
3567     int *error)
3568 {
3569         struct cmsghdr cmh;
3570         int tlen, at;
3571         struct sctp_tcb *stcb;
3572         struct sockaddr *addr;
3573
3574 #ifdef INET
3575         struct sockaddr_in sin;
3576
3577 #endif
3578 #ifdef INET6
3579         struct sockaddr_in6 sin6;
3580
3581 #endif
3582
3583         tlen = SCTP_BUF_LEN(control);
3584         at = 0;
3585         while (at < tlen) {
3586                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3587                         /* There is not enough room for one more. */
3588                         *error = EINVAL;
3589                         return (NULL);
3590                 }
3591                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3592                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3593                         /* We dont't have a complete CMSG header. */
3594                         *error = EINVAL;
3595                         return (NULL);
3596                 }
3597                 if (((int)cmh.cmsg_len + at) > tlen) {
3598                         /* We don't have the complete CMSG. */
3599                         *error = EINVAL;
3600                         return (NULL);
3601                 }
3602                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3603                         switch (cmh.cmsg_type) {
3604 #ifdef INET
3605                         case SCTP_DSTADDRV4:
3606                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3607                                         *error = EINVAL;
3608                                         return (NULL);
3609                                 }
3610                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3611                                 sin.sin_family = AF_INET;
3612                                 sin.sin_len = sizeof(struct sockaddr_in);
3613                                 sin.sin_port = port;
3614                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3615                                 addr = (struct sockaddr *)&sin;
3616                                 break;
3617 #endif
3618 #ifdef INET6
3619                         case SCTP_DSTADDRV6:
3620                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3621                                         *error = EINVAL;
3622                                         return (NULL);
3623                                 }
3624                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3625                                 sin6.sin6_family = AF_INET6;
3626                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3627                                 sin6.sin6_port = port;
3628                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3629 #ifdef INET
3630                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3631                                         in6_sin6_2_sin(&sin, &sin6);
3632                                         addr = (struct sockaddr *)&sin;
3633                                 } else
3634 #endif
3635                                         addr = (struct sockaddr *)&sin6;
3636                                 break;
3637 #endif
3638                         default:
3639                                 addr = NULL;
3640                                 break;
3641                         }
3642                         if (addr) {
3643                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3644                                 if (stcb != NULL) {
3645                                         return (stcb);
3646                                 }
3647                         }
3648                 }
3649                 at += CMSG_ALIGN(cmh.cmsg_len);
3650         }
3651         return (NULL);
3652 }
3653
3654 static struct mbuf *
3655 sctp_add_cookie(struct mbuf *init, int init_offset,
3656     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3657 {
3658         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3659         struct sctp_state_cookie *stc;
3660         struct sctp_paramhdr *ph;
3661         uint8_t *foo;
3662         int sig_offset;
3663         uint16_t cookie_sz;
3664
3665         mret = NULL;
3666         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3667             sizeof(struct sctp_paramhdr)), 0,
3668             M_DONTWAIT, 1, MT_DATA);
3669         if (mret == NULL) {
3670                 return (NULL);
3671         }
3672         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3673         if (copy_init == NULL) {
3674                 sctp_m_freem(mret);
3675                 return (NULL);
3676         }
3677 #ifdef SCTP_MBUF_LOGGING
3678         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3679                 struct mbuf *mat;
3680
3681                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3682                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3683                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3684                         }
3685                 }
3686         }
3687 #endif
3688         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3689             M_DONTWAIT);
3690         if (copy_initack == NULL) {
3691                 sctp_m_freem(mret);
3692                 sctp_m_freem(copy_init);
3693                 return (NULL);
3694         }
3695 #ifdef SCTP_MBUF_LOGGING
3696         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3697                 struct mbuf *mat;
3698
3699                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3700                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3701                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3702                         }
3703                 }
3704         }
3705 #endif
3706         /* easy side we just drop it on the end */
3707         ph = mtod(mret, struct sctp_paramhdr *);
3708         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3709             sizeof(struct sctp_paramhdr);
3710         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3711             sizeof(struct sctp_paramhdr));
3712         ph->param_type = htons(SCTP_STATE_COOKIE);
3713         ph->param_length = 0;   /* fill in at the end */
3714         /* Fill in the stc cookie data */
3715         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3716
3717         /* tack the INIT and then the INIT-ACK onto the chain */
3718         cookie_sz = 0;
3719         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3720                 cookie_sz += SCTP_BUF_LEN(m_at);
3721                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3722                         SCTP_BUF_NEXT(m_at) = copy_init;
3723                         break;
3724                 }
3725         }
3726         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3727                 cookie_sz += SCTP_BUF_LEN(m_at);
3728                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3729                         SCTP_BUF_NEXT(m_at) = copy_initack;
3730                         break;
3731                 }
3732         }
3733         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3734                 cookie_sz += SCTP_BUF_LEN(m_at);
3735                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3736                         break;
3737                 }
3738         }
3739         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3740         if (sig == NULL) {
3741                 /* no space, so free the entire chain */
3742                 sctp_m_freem(mret);
3743                 return (NULL);
3744         }
3745         SCTP_BUF_LEN(sig) = 0;
3746         SCTP_BUF_NEXT(m_at) = sig;
3747         sig_offset = 0;
3748         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3749         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3750         *signature = foo;
3751         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3752         cookie_sz += SCTP_SIGNATURE_SIZE;
3753         ph->param_length = htons(cookie_sz);
3754         return (mret);
3755 }
3756
3757
3758 static uint8_t
3759 sctp_get_ect(struct sctp_tcb *stcb)
3760 {
3761         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3762                 return (SCTP_ECT0_BIT);
3763         } else {
3764                 return (0);
3765         }
3766 }
3767
3768 #if defined(INET) || defined(INET6)
3769 static void
3770 sctp_handle_no_route(struct sctp_tcb *stcb,
3771     struct sctp_nets *net,
3772     int so_locked)
3773 {
3774         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3775
3776         if (net) {
3777                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3778                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3779                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3780                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3781                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3782                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3783                                     stcb, 0,
3784                                     (void *)net,
3785                                     so_locked);
3786                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3787                                 net->dest_state &= ~SCTP_ADDR_PF;
3788                         }
3789                 }
3790                 if (stcb) {
3791                         if (net == stcb->asoc.primary_destination) {
3792                                 /* need a new primary */
3793                                 struct sctp_nets *alt;
3794
3795                                 alt = sctp_find_alternate_net(stcb, net, 0);
3796                                 if (alt != net) {
3797                                         if (stcb->asoc.alternate) {
3798                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3799                                         }
3800                                         stcb->asoc.alternate = alt;
3801                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3802                                         if (net->ro._s_addr) {
3803                                                 sctp_free_ifa(net->ro._s_addr);
3804                                                 net->ro._s_addr = NULL;
3805                                         }
3806                                         net->src_addr_selected = 0;
3807                                 }
3808                         }
3809                 }
3810         }
3811 }
3812
3813 #endif
3814
3815 static int
3816 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3817     struct sctp_tcb *stcb,      /* may be NULL */
3818     struct sctp_nets *net,
3819     struct sockaddr *to,
3820     struct mbuf *m,
3821     uint32_t auth_offset,
3822     struct sctp_auth_chunk *auth,
3823     uint16_t auth_keyid,
3824     int nofragment_flag,
3825     int ecn_ok,
3826     int out_of_asoc_ok,
3827     uint16_t src_port,
3828     uint16_t dest_port,
3829     uint32_t v_tag,
3830     uint16_t port,
3831     union sctp_sockstore *over_addr,
3832     uint8_t use_mflowid, uint32_t mflowid,
3833 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3834     int so_locked SCTP_UNUSED
3835 #else
3836     int so_locked
3837 #endif
3838 )
3839 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3840 {
3841         /**
3842          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3843          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3844          * - fill in the HMAC digest of any AUTH chunk in the packet.
3845          * - calculate and fill in the SCTP checksum.
3846          * - prepend an IP address header.
3847          * - if boundall use INADDR_ANY.
3848          * - if boundspecific do source address selection.
3849          * - set fragmentation option for ipV4.
3850          * - On return from IP output, check/adjust mtu size of output
3851          *   interface and smallest_mtu size as well.
3852          */
3853         /* Will need ifdefs around this */
3854         struct mbuf *newm;
3855         struct sctphdr *sctphdr;
3856         int packet_length;
3857         int ret;
3858         uint32_t vrf_id;
3859
3860 #if defined(INET) || defined(INET6)
3861         struct mbuf *o_pak;
3862         sctp_route_t *ro = NULL;
3863         struct udphdr *udp = NULL;
3864
3865 #endif
3866         uint8_t tos_value;
3867
3868 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3869         struct socket *so = NULL;
3870
3871 #endif
3872
3873         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3874                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3875                 sctp_m_freem(m);
3876                 return (EFAULT);
3877         }
3878         if (stcb) {
3879                 vrf_id = stcb->asoc.vrf_id;
3880         } else {
3881                 vrf_id = inp->def_vrf_id;
3882         }
3883
3884         /* fill in the HMAC digest for any AUTH chunk in the packet */
3885         if ((auth != NULL) && (stcb != NULL)) {
3886                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3887         }
3888         if (net) {
3889                 tos_value = net->dscp;
3890         } else if (stcb) {
3891                 tos_value = stcb->asoc.default_dscp;
3892         } else {
3893                 tos_value = inp->sctp_ep.default_dscp;
3894         }
3895
3896         switch (to->sa_family) {
3897 #ifdef INET
3898         case AF_INET:
3899                 {
3900                         struct ip *ip = NULL;
3901                         sctp_route_t iproute;
3902                         int len;
3903
3904                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3905                         if (port) {
3906                                 len += sizeof(struct udphdr);
3907                         }
3908                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3909                         if (newm == NULL) {
3910                                 sctp_m_freem(m);
3911                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3912                                 return (ENOMEM);
3913                         }
3914                         SCTP_ALIGN_TO_END(newm, len);
3915                         SCTP_BUF_LEN(newm) = len;
3916                         SCTP_BUF_NEXT(newm) = m;
3917                         m = newm;
3918                         if (net != NULL) {
3919 #ifdef INVARIANTS
3920                                 if (net->flowidset == 0) {
3921                                         panic("Flow ID not set");
3922                                 }
3923 #endif
3924                                 m->m_pkthdr.flowid = net->flowid;
3925                                 m->m_flags |= M_FLOWID;
3926                         } else {
3927                                 if (use_mflowid != 0) {
3928                                         m->m_pkthdr.flowid = mflowid;
3929                                         m->m_flags |= M_FLOWID;
3930                                 }
3931                         }
3932                         packet_length = sctp_calculate_len(m);
3933                         ip = mtod(m, struct ip *);
3934                         ip->ip_v = IPVERSION;
3935                         ip->ip_hl = (sizeof(struct ip) >> 2);
3936                         if (tos_value == 0) {
3937                                 /*
3938                                  * This means especially, that it is not set
3939                                  * at the SCTP layer. So use the value from
3940                                  * the IP layer.
3941                                  */
3942                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3943                         }
3944                         tos_value &= 0xfc;
3945                         if (ecn_ok) {
3946                                 tos_value |= sctp_get_ect(stcb);
3947                         }
3948                         if ((nofragment_flag) && (port == 0)) {
3949                                 ip->ip_off = IP_DF;
3950                         } else {
3951                                 ip->ip_off = 0;
3952                         }
3953                         /* FreeBSD has a function for ip_id's */
3954                         ip->ip_id = ip_newid();
3955
3956                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3957                         ip->ip_len = packet_length;
3958                         ip->ip_tos = tos_value;
3959                         if (port) {
3960                                 ip->ip_p = IPPROTO_UDP;
3961                         } else {
3962                                 ip->ip_p = IPPROTO_SCTP;
3963                         }
3964                         ip->ip_sum = 0;
3965                         if (net == NULL) {
3966                                 ro = &iproute;
3967                                 memset(&iproute, 0, sizeof(iproute));
3968                                 memcpy(&ro->ro_dst, to, to->sa_len);
3969                         } else {
3970                                 ro = (sctp_route_t *) & net->ro;
3971                         }
3972                         /* Now the address selection part */
3973                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
3974
3975                         /* call the routine to select the src address */
3976                         if (net && out_of_asoc_ok == 0) {
3977                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
3978                                         sctp_free_ifa(net->ro._s_addr);
3979                                         net->ro._s_addr = NULL;
3980                                         net->src_addr_selected = 0;
3981                                         if (ro->ro_rt) {
3982                                                 RTFREE(ro->ro_rt);
3983                                                 ro->ro_rt = NULL;
3984                                         }
3985                                 }
3986                                 if (net->src_addr_selected == 0) {
3987                                         /* Cache the source address */
3988                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
3989                                             ro, net, 0,
3990                                             vrf_id);
3991                                         net->src_addr_selected = 1;
3992                                 }
3993                                 if (net->ro._s_addr == NULL) {
3994                                         /* No route to host */
3995                                         net->src_addr_selected = 0;
3996                                         sctp_handle_no_route(stcb, net, so_locked);
3997                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
3998                                         sctp_m_freem(m);
3999                                         return (EHOSTUNREACH);
4000                                 }
4001                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4002                         } else {
4003                                 if (over_addr == NULL) {
4004                                         struct sctp_ifa *_lsrc;
4005
4006                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4007                                             net,
4008                                             out_of_asoc_ok,
4009                                             vrf_id);
4010                                         if (_lsrc == NULL) {
4011                                                 sctp_handle_no_route(stcb, net, so_locked);
4012                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4013                                                 sctp_m_freem(m);
4014                                                 return (EHOSTUNREACH);
4015                                         }
4016                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4017                                         sctp_free_ifa(_lsrc);
4018                                 } else {
4019                                         ip->ip_src = over_addr->sin.sin_addr;
4020                                         SCTP_RTALLOC(ro, vrf_id);
4021                                 }
4022                         }
4023                         if (port) {
4024                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4025                                         sctp_handle_no_route(stcb, net, so_locked);
4026                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4027                                         sctp_m_freem(m);
4028                                         return (EHOSTUNREACH);
4029                                 }
4030                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4031                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4032                                 udp->uh_dport = port;
4033                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4034                                 if (V_udp_cksum) {
4035                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4036                                 } else {
4037                                         udp->uh_sum = 0;
4038                                 }
4039                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4040                         } else {
4041                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4042                         }
4043
4044                         sctphdr->src_port = src_port;
4045                         sctphdr->dest_port = dest_port;
4046                         sctphdr->v_tag = v_tag;
4047                         sctphdr->checksum = 0;
4048
4049                         /*
4050                          * If source address selection fails and we find no
4051                          * route then the ip_output should fail as well with
4052                          * a NO_ROUTE_TO_HOST type error. We probably should
4053                          * catch that somewhere and abort the association
4054                          * right away (assuming this is an INIT being sent).
4055                          */
4056                         if (ro->ro_rt == NULL) {
4057                                 /*
4058                                  * src addr selection failed to find a route
4059                                  * (or valid source addr), so we can't get
4060                                  * there from here (yet)!
4061                                  */
4062                                 sctp_handle_no_route(stcb, net, so_locked);
4063                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4064                                 sctp_m_freem(m);
4065                                 return (EHOSTUNREACH);
4066                         }
4067                         if (ro != &iproute) {
4068                                 memcpy(&iproute, ro, sizeof(*ro));
4069                         }
4070                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4071                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4072                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4073                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4074                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4075                             (void *)ro->ro_rt);
4076
4077                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4078                                 /* failed to prepend data, give up */
4079                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4080                                 sctp_m_freem(m);
4081                                 return (ENOMEM);
4082                         }
4083                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4084                         if (port) {
4085 #if defined(SCTP_WITH_NO_CSUM)
4086                                 SCTP_STAT_INCR(sctps_sendnocrc);
4087 #else
4088                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4089                                 SCTP_STAT_INCR(sctps_sendswcrc);
4090 #endif
4091                                 if (V_udp_cksum) {
4092                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4093                                 }
4094                         } else {
4095 #if defined(SCTP_WITH_NO_CSUM)
4096                                 SCTP_STAT_INCR(sctps_sendnocrc);
4097 #else
4098                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4099                                 m->m_pkthdr.csum_data = 0;
4100                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4101 #endif
4102                         }
4103 #ifdef SCTP_PACKET_LOGGING
4104                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4105                                 sctp_packet_log(o_pak);
4106 #endif
4107                         /* send it out.  table id is taken from stcb */
4108 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4109                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4110                                 so = SCTP_INP_SO(inp);
4111                                 SCTP_SOCKET_UNLOCK(so, 0);
4112                         }
4113 #endif
4114                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4115 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4116                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4117                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4118                                 SCTP_TCB_UNLOCK(stcb);
4119                                 SCTP_SOCKET_LOCK(so, 0);
4120                                 SCTP_TCB_LOCK(stcb);
4121                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4122                         }
4123 #endif
4124                         SCTP_STAT_INCR(sctps_sendpackets);
4125                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4126                         if (ret)
4127                                 SCTP_STAT_INCR(sctps_senderrors);
4128
4129                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4130                         if (net == NULL) {
4131                                 /* free tempy routes */
4132                                 RO_RTFREE(ro);
4133                         } else {
4134                                 /*
4135                                  * PMTU check versus smallest asoc MTU goes
4136                                  * here
4137                                  */
4138                                 if ((ro->ro_rt != NULL) &&
4139                                     (net->ro._s_addr)) {
4140                                         uint32_t mtu;
4141
4142                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4143                                         if (net->port) {
4144                                                 mtu -= sizeof(struct udphdr);
4145                                         }
4146                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4147                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4148                                                 net->mtu = mtu;
4149                                         }
4150                                 } else if (ro->ro_rt == NULL) {
4151                                         /* route was freed */
4152                                         if (net->ro._s_addr &&
4153                                             net->src_addr_selected) {
4154                                                 sctp_free_ifa(net->ro._s_addr);
4155                                                 net->ro._s_addr = NULL;
4156                                         }
4157                                         net->src_addr_selected = 0;
4158                                 }
4159                         }
4160                         return (ret);
4161                 }
4162 #endif
4163 #ifdef INET6
4164         case AF_INET6:
4165                 {
4166                         uint32_t flowlabel, flowinfo;
4167                         struct ip6_hdr *ip6h;
4168                         struct route_in6 ip6route;
4169                         struct ifnet *ifp;
4170                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4171                         int prev_scope = 0;
4172                         struct sockaddr_in6 lsa6_storage;
4173                         int error;
4174                         u_short prev_port = 0;
4175                         int len;
4176
4177                         if (net) {
4178                                 flowlabel = net->flowlabel;
4179                         } else if (stcb) {
4180                                 flowlabel = stcb->asoc.default_flowlabel;
4181                         } else {
4182                                 flowlabel = inp->sctp_ep.default_flowlabel;
4183                         }
4184                         if (flowlabel == 0) {
4185                                 /*
4186                                  * This means especially, that it is not set
4187                                  * at the SCTP layer. So use the value from
4188                                  * the IP layer.
4189                                  */
4190                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4191                         }
4192                         flowlabel &= 0x000fffff;
4193                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4194                         if (port) {
4195                                 len += sizeof(struct udphdr);
4196                         }
4197                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4198                         if (newm == NULL) {
4199                                 sctp_m_freem(m);
4200                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4201                                 return (ENOMEM);
4202                         }
4203                         SCTP_ALIGN_TO_END(newm, len);
4204                         SCTP_BUF_LEN(newm) = len;
4205                         SCTP_BUF_NEXT(newm) = m;
4206                         m = newm;
4207                         if (net != NULL) {
4208 #ifdef INVARIANTS
4209                                 if (net->flowidset == 0) {
4210                                         panic("Flow ID not set");
4211                                 }
4212 #endif
4213                                 m->m_pkthdr.flowid = net->flowid;
4214                                 m->m_flags |= M_FLOWID;
4215                         } else {
4216                                 if (use_mflowid != 0) {
4217                                         m->m_pkthdr.flowid = mflowid;
4218                                         m->m_flags |= M_FLOWID;
4219                                 }
4220                         }
4221                         packet_length = sctp_calculate_len(m);
4222
4223                         ip6h = mtod(m, struct ip6_hdr *);
4224                         /* protect *sin6 from overwrite */
4225                         sin6 = (struct sockaddr_in6 *)to;
4226                         tmp = *sin6;
4227                         sin6 = &tmp;
4228
4229                         /* KAME hack: embed scopeid */
4230                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4231                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4232                                 return (EINVAL);
4233                         }
4234                         if (net == NULL) {
4235                                 memset(&ip6route, 0, sizeof(ip6route));
4236                                 ro = (sctp_route_t *) & ip6route;
4237                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4238                         } else {
4239                                 ro = (sctp_route_t *) & net->ro;
4240                         }
4241                         /*
4242                          * We assume here that inp_flow is in host byte
4243                          * order within the TCB!
4244                          */
4245                         if (tos_value == 0) {
4246                                 /*
4247                                  * This means especially, that it is not set
4248                                  * at the SCTP layer. So use the value from
4249                                  * the IP layer.
4250                                  */
4251                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4252                         }
4253                         tos_value &= 0xfc;
4254                         if (ecn_ok) {
4255                                 tos_value |= sctp_get_ect(stcb);
4256                         }
4257                         flowinfo = 0x06;
4258                         flowinfo <<= 8;
4259                         flowinfo |= tos_value;
4260                         flowinfo <<= 20;
4261                         flowinfo |= flowlabel;
4262                         ip6h->ip6_flow = htonl(flowinfo);
4263                         if (port) {
4264                                 ip6h->ip6_nxt = IPPROTO_UDP;
4265                         } else {
4266                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4267                         }
4268                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4269                         ip6h->ip6_dst = sin6->sin6_addr;
4270
4271                         /*
4272                          * Add SRC address selection here: we can only reuse
4273                          * to a limited degree the kame src-addr-sel, since
4274                          * we can try their selection but it may not be
4275                          * bound.
4276                          */
4277                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4278                         lsa6_tmp.sin6_family = AF_INET6;
4279                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4280                         lsa6 = &lsa6_tmp;
4281                         if (net && out_of_asoc_ok == 0) {
4282                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4283                                         sctp_free_ifa(net->ro._s_addr);
4284                                         net->ro._s_addr = NULL;
4285                                         net->src_addr_selected = 0;
4286                                         if (ro->ro_rt) {
4287                                                 RTFREE(ro->ro_rt);
4288                                                 ro->ro_rt = NULL;
4289                                         }
4290                                 }
4291                                 if (net->src_addr_selected == 0) {
4292                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4293                                         /* KAME hack: embed scopeid */
4294                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4295                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4296                                                 return (EINVAL);
4297                                         }
4298                                         /* Cache the source address */
4299                                         net->ro._s_addr = sctp_source_address_selection(inp,
4300                                             stcb,
4301                                             ro,
4302                                             net,
4303                                             0,
4304                                             vrf_id);
4305                                         (void)sa6_recoverscope(sin6);
4306                                         net->src_addr_selected = 1;
4307                                 }
4308                                 if (net->ro._s_addr == NULL) {
4309                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4310                                         net->src_addr_selected = 0;
4311                                         sctp_handle_no_route(stcb, net, so_locked);
4312                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4313                                         sctp_m_freem(m);
4314                                         return (EHOSTUNREACH);
4315                                 }
4316                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4317                         } else {
4318                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4319                                 /* KAME hack: embed scopeid */
4320                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4321                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4322                                         return (EINVAL);
4323                                 }
4324                                 if (over_addr == NULL) {
4325                                         struct sctp_ifa *_lsrc;
4326
4327                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4328                                             net,
4329                                             out_of_asoc_ok,
4330                                             vrf_id);
4331                                         if (_lsrc == NULL) {
4332                                                 sctp_handle_no_route(stcb, net, so_locked);
4333                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4334                                                 sctp_m_freem(m);
4335                                                 return (EHOSTUNREACH);
4336                                         }
4337                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4338                                         sctp_free_ifa(_lsrc);
4339                                 } else {
4340                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4341                                         SCTP_RTALLOC(ro, vrf_id);
4342                                 }
4343                                 (void)sa6_recoverscope(sin6);
4344                         }
4345                         lsa6->sin6_port = inp->sctp_lport;
4346
4347                         if (ro->ro_rt == NULL) {
4348                                 /*
4349                                  * src addr selection failed to find a route
4350                                  * (or valid source addr), so we can't get
4351                                  * there from here!
4352                                  */
4353                                 sctp_handle_no_route(stcb, net, so_locked);
4354                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4355                                 sctp_m_freem(m);
4356                                 return (EHOSTUNREACH);
4357                         }
4358                         /*
4359                          * XXX: sa6 may not have a valid sin6_scope_id in
4360                          * the non-SCOPEDROUTING case.
4361                          */
4362                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4363                         lsa6_storage.sin6_family = AF_INET6;
4364                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4365                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4366                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4367                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4368                                 sctp_m_freem(m);
4369                                 return (error);
4370                         }
4371                         /* XXX */
4372                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4373                         lsa6_storage.sin6_port = inp->sctp_lport;
4374                         lsa6 = &lsa6_storage;
4375                         ip6h->ip6_src = lsa6->sin6_addr;
4376
4377                         if (port) {
4378                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4379                                         sctp_handle_no_route(stcb, net, so_locked);
4380                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4381                                         sctp_m_freem(m);
4382                                         return (EHOSTUNREACH);
4383                                 }
4384                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4385                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4386                                 udp->uh_dport = port;
4387                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4388                                 udp->uh_sum = 0;
4389                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4390                         } else {
4391                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4392                         }
4393
4394                         sctphdr->src_port = src_port;
4395                         sctphdr->dest_port = dest_port;
4396                         sctphdr->v_tag = v_tag;
4397                         sctphdr->checksum = 0;
4398
4399                         /*
4400                          * We set the hop limit now since there is a good
4401                          * chance that our ro pointer is now filled
4402                          */
4403                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4404                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4405
4406 #ifdef SCTP_DEBUG
4407                         /* Copy to be sure something bad is not happening */
4408                         sin6->sin6_addr = ip6h->ip6_dst;
4409                         lsa6->sin6_addr = ip6h->ip6_src;
4410 #endif
4411
4412                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4413                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4414                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4415                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4416                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4417                         if (net) {
4418                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4419                                 /*
4420                                  * preserve the port and scope for link
4421                                  * local send
4422                                  */
4423                                 prev_scope = sin6->sin6_scope_id;
4424                                 prev_port = sin6->sin6_port;
4425                         }
4426                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4427                                 /* failed to prepend data, give up */
4428                                 sctp_m_freem(m);
4429                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4430                                 return (ENOMEM);
4431                         }
4432                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4433                         if (port) {
4434 #if defined(SCTP_WITH_NO_CSUM)
4435                                 SCTP_STAT_INCR(sctps_sendnocrc);
4436 #else
4437                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4438                                 SCTP_STAT_INCR(sctps_sendswcrc);
4439 #endif
4440                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4441                                         udp->uh_sum = 0xffff;
4442                                 }
4443                         } else {
4444 #if defined(SCTP_WITH_NO_CSUM)
4445                                 SCTP_STAT_INCR(sctps_sendnocrc);
4446 #else
4447                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4448                                 m->m_pkthdr.csum_data = 0;
4449                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4450 #endif
4451                         }
4452                         /* send it out. table id is taken from stcb */
4453 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4454                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4455                                 so = SCTP_INP_SO(inp);
4456                                 SCTP_SOCKET_UNLOCK(so, 0);
4457                         }
4458 #endif
4459 #ifdef SCTP_PACKET_LOGGING
4460                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4461                                 sctp_packet_log(o_pak);
4462 #endif
4463                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4464 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4465                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4466                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4467                                 SCTP_TCB_UNLOCK(stcb);
4468                                 SCTP_SOCKET_LOCK(so, 0);
4469                                 SCTP_TCB_LOCK(stcb);
4470                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4471                         }
4472 #endif
4473                         if (net) {
4474                                 /* for link local this must be done */
4475                                 sin6->sin6_scope_id = prev_scope;
4476                                 sin6->sin6_port = prev_port;
4477                         }
4478                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4479                         SCTP_STAT_INCR(sctps_sendpackets);
4480                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4481                         if (ret) {
4482                                 SCTP_STAT_INCR(sctps_senderrors);
4483                         }
4484                         if (net == NULL) {
4485                                 /* Now if we had a temp route free it */
4486                                 RO_RTFREE(ro);
4487                         } else {
4488                                 /*
4489                                  * PMTU check versus smallest asoc MTU goes
4490                                  * here
4491                                  */
4492                                 if (ro->ro_rt == NULL) {
4493                                         /* Route was freed */
4494                                         if (net->ro._s_addr &&
4495                                             net->src_addr_selected) {
4496                                                 sctp_free_ifa(net->ro._s_addr);
4497                                                 net->ro._s_addr = NULL;
4498                                         }
4499                                         net->src_addr_selected = 0;
4500                                 }
4501                                 if ((ro->ro_rt != NULL) &&
4502                                     (net->ro._s_addr)) {
4503                                         uint32_t mtu;
4504
4505                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4506                                         if (mtu &&
4507                                             (stcb->asoc.smallest_mtu > mtu)) {
4508                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4509                                                 net->mtu = mtu;
4510                                                 if (net->port) {
4511                                                         net->mtu -= sizeof(struct udphdr);
4512                                                 }
4513                                         }
4514                                 } else if (ifp) {
4515                                         if (ND_IFINFO(ifp)->linkmtu &&
4516                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4517                                                 sctp_mtu_size_reset(inp,
4518                                                     &stcb->asoc,
4519                                                     ND_IFINFO(ifp)->linkmtu);
4520                                         }
4521                                 }
4522                         }
4523                         return (ret);
4524                 }
4525 #endif
4526         default:
4527                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4528                     ((struct sockaddr *)to)->sa_family);
4529                 sctp_m_freem(m);
4530                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4531                 return (EFAULT);
4532         }
4533 }
4534
4535
4536 void
4537 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4538 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4539     SCTP_UNUSED
4540 #endif
4541 )
4542 {
4543         struct mbuf *m;
4544         struct sctp_nets *net;
4545         struct sctp_init_chunk *init;
4546
4547 #if defined(INET) || defined(INET6)
4548         struct sctp_supported_addr_param *sup_addr;
4549
4550 #endif
4551         struct sctp_adaptation_layer_indication *ali;
4552         struct sctp_supported_chunk_types_param *pr_supported;
4553         struct sctp_paramhdr *ph;
4554         int cnt_inits_to = 0;
4555         int ret;
4556         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4557
4558         /* INIT's always go to the primary (and usually ONLY address) */
4559         net = stcb->asoc.primary_destination;
4560         if (net == NULL) {
4561                 net = TAILQ_FIRST(&stcb->asoc.nets);
4562                 if (net == NULL) {
4563                         /* TSNH */
4564                         return;
4565                 }
4566                 /* we confirm any address we send an INIT to */
4567                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4568                 (void)sctp_set_primary_addr(stcb, NULL, net);
4569         } else {
4570                 /* we confirm any address we send an INIT to */
4571                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4572         }
4573         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4574 #ifdef INET6
4575         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4576                 /*
4577                  * special hook, if we are sending to link local it will not
4578                  * show up in our private address count.
4579                  */
4580                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4581                         cnt_inits_to = 1;
4582         }
4583 #endif
4584         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4585                 /* This case should not happen */
4586                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4587                 return;
4588         }
4589         /* start the INIT timer */
4590         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4591
4592         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4593         if (m == NULL) {
4594                 /* No memory, INIT timer will re-attempt. */
4595                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4596                 return;
4597         }
4598         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4599         padding_len = 0;
4600         /*
4601          * assume peer supports asconf in order to be able to queue local
4602          * address changes while an INIT is in flight and before the assoc
4603          * is established.
4604          */
4605         stcb->asoc.peer_supports_asconf = 1;
4606         /* Now lets put the chunk header in place */
4607         init = mtod(m, struct sctp_init_chunk *);
4608         /* now the chunk header */
4609         init->ch.chunk_type = SCTP_INITIATION;
4610         init->ch.chunk_flags = 0;
4611         /* fill in later from mbuf we build */
4612         init->ch.chunk_length = 0;
4613         /* place in my tag */
4614         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4615         /* set up some of the credits. */
4616         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4617             SCTP_MINIMAL_RWND));
4618         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4619         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4620         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4621
4622         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
4623                 uint8_t i;
4624
4625                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4626                 if (stcb->asoc.scope.ipv4_addr_legal) {
4627                         parameter_len += (uint16_t) sizeof(uint16_t);
4628                 }
4629                 if (stcb->asoc.scope.ipv6_addr_legal) {
4630                         parameter_len += (uint16_t) sizeof(uint16_t);
4631                 }
4632                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4633                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4634                 sup_addr->ph.param_length = htons(parameter_len);
4635                 i = 0;
4636                 if (stcb->asoc.scope.ipv4_addr_legal) {
4637                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
4638                 }
4639                 if (stcb->asoc.scope.ipv6_addr_legal) {
4640                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
4641                 }
4642                 padding_len = 4 - 2 * i;
4643                 chunk_len += parameter_len;
4644         }
4645         /* Adaptation layer indication parameter */
4646         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
4647                 if (padding_len > 0) {
4648                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4649                         chunk_len += padding_len;
4650                         padding_len = 0;
4651                 }
4652                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4653                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4654                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4655                 ali->ph.param_length = htons(parameter_len);
4656                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4657                 chunk_len += parameter_len;
4658         }
4659         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4660                 /* Add NAT friendly parameter. */
4661                 if (padding_len > 0) {
4662                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4663                         chunk_len += padding_len;
4664                         padding_len = 0;
4665                 }
4666                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4667                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4668                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4669                 ph->param_length = htons(parameter_len);
4670                 chunk_len += parameter_len;
4671         }
4672         /* now any cookie time extensions */
4673         if (stcb->asoc.cookie_preserve_req) {
4674                 struct sctp_cookie_perserve_param *cookie_preserve;
4675
4676                 if (padding_len > 0) {
4677                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4678                         chunk_len += padding_len;
4679                         padding_len = 0;
4680                 }
4681                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4682                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4683                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4684                 cookie_preserve->ph.param_length = htons(parameter_len);
4685                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4686                 stcb->asoc.cookie_preserve_req = 0;
4687                 chunk_len += parameter_len;
4688         }
4689         /* ECN parameter */
4690         if (stcb->asoc.ecn_allowed == 1) {
4691                 if (padding_len > 0) {
4692                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4693                         chunk_len += padding_len;
4694                         padding_len = 0;
4695                 }
4696                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4697                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4698                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4699                 ph->param_length = htons(parameter_len);
4700                 chunk_len += parameter_len;
4701         }
4702         /* And now tell the peer we do support PR-SCTP. */
4703         if (padding_len > 0) {
4704                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4705                 chunk_len += padding_len;
4706                 padding_len = 0;
4707         }
4708         parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4709         ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4710         ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4711         ph->param_length = htons(parameter_len);
4712         chunk_len += parameter_len;
4713
4714         /* And now tell the peer we do all the extensions */
4715         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4716         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4717         num_ext = 0;
4718         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4719         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4720         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4721         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4722         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4723         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4724                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4725         }
4726         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4727                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4728         }
4729         parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4730         pr_supported->ph.param_length = htons(parameter_len);
4731         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4732         chunk_len += parameter_len;
4733
4734         /* add authentication parameters */
4735         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4736                 /* attach RANDOM parameter, if available */
4737                 if (stcb->asoc.authinfo.random != NULL) {
4738                         struct sctp_auth_random *randp;
4739
4740                         if (padding_len > 0) {
4741                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4742                                 chunk_len += padding_len;
4743                                 padding_len = 0;
4744                         }
4745                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4746                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4747                         /* random key already contains the header */
4748                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4749                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4750                         chunk_len += parameter_len;
4751                 }
4752                 /* add HMAC_ALGO parameter */
4753                 if ((stcb->asoc.local_hmacs != NULL) &&
4754                     (stcb->asoc.local_hmacs->num_algo > 0)) {
4755                         struct sctp_auth_hmac_algo *hmacs;
4756
4757                         if (padding_len > 0) {
4758                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4759                                 chunk_len += padding_len;
4760                                 padding_len = 0;
4761                         }
4762                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4763                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4764                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4765                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4766                         hmacs->ph.param_length = htons(parameter_len);
4767                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4768                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4769                         chunk_len += parameter_len;
4770                 }
4771                 /* add CHUNKS parameter */
4772                 if (sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks) > 0) {
4773                         struct sctp_auth_chunk_list *chunks;
4774
4775                         if (padding_len > 0) {
4776                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4777                                 chunk_len += padding_len;
4778                                 padding_len = 0;
4779                         }
4780                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4781                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4782                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4783                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4784                         chunks->ph.param_length = htons(parameter_len);
4785                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4786                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4787                         chunk_len += parameter_len;
4788                 }
4789         }
4790         SCTP_BUF_LEN(m) = chunk_len;
4791
4792         /* now the addresses */
4793         /*
4794          * To optimize this we could put the scoping stuff into a structure
4795          * and remove the individual uint8's from the assoc structure. Then
4796          * we could just sifa in the address within the stcb. But for now
4797          * this is a quick hack to get the address stuff teased apart.
4798          */
4799         sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope, m, cnt_inits_to, &padding_len, &chunk_len);
4800
4801         init->ch.chunk_length = htons(chunk_len);
4802         if (padding_len > 0) {
4803                 struct mbuf *m_at, *mp_last;
4804
4805                 mp_last = NULL;
4806                 for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4807                         if (SCTP_BUF_NEXT(m_at) == NULL)
4808                                 mp_last = m_at;
4809                 }
4810                 if ((mp_last == NULL) || sctp_add_pad_tombuf(mp_last, padding_len)) {
4811                         sctp_m_freem(m);
4812                         return;
4813                 }
4814         }
4815         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4816         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4817             (struct sockaddr *)&net->ro._l_addr,
4818             m, 0, NULL, 0, 0, 0, 0,
4819             inp->sctp_lport, stcb->rport, htonl(0),
4820             net->port, NULL,
4821             0, 0,
4822             so_locked);
4823         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4824         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4825         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4826 }
4827
4828 struct mbuf *
4829 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4830     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4831 {
4832         /*
4833          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4834          * being equal to the beginning of the params i.e. (iphlen +
4835          * sizeof(struct sctp_init_msg) parse through the parameters to the
4836          * end of the mbuf verifying that all parameters are known.
4837          *
4838          * For unknown parameters build and return a mbuf with
4839          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4840          * processing this chunk stop, and set *abort_processing to 1.
4841          *
4842          * By having param_offset be pre-set to where parameters begin it is
4843          * hoped that this routine may be reused in the future by new
4844          * features.
4845          */
4846         struct sctp_paramhdr *phdr, params;
4847
4848         struct mbuf *mat, *op_err;
4849         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4850         int at, limit, pad_needed;
4851         uint16_t ptype, plen, padded_size;
4852         int err_at;
4853
4854         *abort_processing = 0;
4855         mat = in_initpkt;
4856         err_at = 0;
4857         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4858         at = param_offset;
4859         op_err = NULL;
4860         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4861         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4862         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4863                 ptype = ntohs(phdr->param_type);
4864                 plen = ntohs(phdr->param_length);
4865                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4866                         /* wacked parameter */
4867                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4868                         goto invalid_size;
4869                 }
4870                 limit -= SCTP_SIZE32(plen);
4871                 /*-
4872                  * All parameters for all chunks that we know/understand are
4873                  * listed here. We process them other places and make
4874                  * appropriate stop actions per the upper bits. However this
4875                  * is the generic routine processor's can call to get back
4876                  * an operr.. to either incorporate (init-ack) or send.
4877                  */
4878                 padded_size = SCTP_SIZE32(plen);
4879                 switch (ptype) {
4880                         /* Param's with variable size */
4881                 case SCTP_HEARTBEAT_INFO:
4882                 case SCTP_STATE_COOKIE:
4883                 case SCTP_UNRECOG_PARAM:
4884                 case SCTP_ERROR_CAUSE_IND:
4885                         /* ok skip fwd */
4886                         at += padded_size;
4887                         break;
4888                         /* Param's with variable size within a range */
4889                 case SCTP_CHUNK_LIST:
4890                 case SCTP_SUPPORTED_CHUNK_EXT:
4891                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4892                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4893                                 goto invalid_size;
4894                         }
4895                         at += padded_size;
4896                         break;
4897                 case SCTP_SUPPORTED_ADDRTYPE:
4898                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4899                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4900                                 goto invalid_size;
4901                         }
4902                         at += padded_size;
4903                         break;
4904                 case SCTP_RANDOM:
4905                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4906                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4907                                 goto invalid_size;
4908                         }
4909                         at += padded_size;
4910                         break;
4911                 case SCTP_SET_PRIM_ADDR:
4912                 case SCTP_DEL_IP_ADDRESS:
4913                 case SCTP_ADD_IP_ADDRESS:
4914                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4915                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4916                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4917                                 goto invalid_size;
4918                         }
4919                         at += padded_size;
4920                         break;
4921                         /* Param's with a fixed size */
4922                 case SCTP_IPV4_ADDRESS:
4923                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4924                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4925                                 goto invalid_size;
4926                         }
4927                         at += padded_size;
4928                         break;
4929                 case SCTP_IPV6_ADDRESS:
4930                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4931                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4932                                 goto invalid_size;
4933                         }
4934                         at += padded_size;
4935                         break;
4936                 case SCTP_COOKIE_PRESERVE:
4937                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4938                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4939                                 goto invalid_size;
4940                         }
4941                         at += padded_size;
4942                         break;
4943                 case SCTP_HAS_NAT_SUPPORT:
4944                         *nat_friendly = 1;
4945                         /* fall through */
4946                 case SCTP_PRSCTP_SUPPORTED:
4947
4948                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4949                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4950                                 goto invalid_size;
4951                         }
4952                         at += padded_size;
4953                         break;
4954                 case SCTP_ECN_CAPABLE:
4955                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4956                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4957                                 goto invalid_size;
4958                         }
4959                         at += padded_size;
4960                         break;
4961                 case SCTP_ULP_ADAPTATION:
4962                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4963                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4964                                 goto invalid_size;
4965                         }
4966                         at += padded_size;
4967                         break;
4968                 case SCTP_SUCCESS_REPORT:
4969                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4970                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4971                                 goto invalid_size;
4972                         }
4973                         at += padded_size;
4974                         break;
4975                 case SCTP_HOSTNAME_ADDRESS:
4976                         {
4977                                 /* We can NOT handle HOST NAME addresses!! */
4978                                 int l_len;
4979
4980                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
4981                                 *abort_processing = 1;
4982                                 if (op_err == NULL) {
4983                                         /* Ok need to try to get a mbuf */
4984 #ifdef INET6
4985                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4986 #else
4987                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
4988 #endif
4989                                         l_len += plen;
4990                                         l_len += sizeof(struct sctp_paramhdr);
4991                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
4992                                         if (op_err) {
4993                                                 SCTP_BUF_LEN(op_err) = 0;
4994                                                 /*
4995                                                  * pre-reserve space for ip
4996                                                  * and sctp header  and
4997                                                  * chunk hdr
4998                                                  */
4999 #ifdef INET6
5000                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5001 #else
5002                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5003 #endif
5004                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5005                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5006                                         }
5007                                 }
5008                                 if (op_err) {
5009                                         /* If we have space */
5010                                         struct sctp_paramhdr s;
5011
5012                                         if (err_at % 4) {
5013                                                 uint32_t cpthis = 0;
5014
5015                                                 pad_needed = 4 - (err_at % 4);
5016                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5017                                                 err_at += pad_needed;
5018                                         }
5019                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5020                                         s.param_length = htons(sizeof(s) + plen);
5021                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5022                                         err_at += sizeof(s);
5023                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5024                                         if (phdr == NULL) {
5025                                                 sctp_m_freem(op_err);
5026                                                 /*
5027                                                  * we are out of memory but
5028                                                  * we still need to have a
5029                                                  * look at what to do (the
5030                                                  * system is in trouble
5031                                                  * though).
5032                                                  */
5033                                                 return (NULL);
5034                                         }
5035                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5036                                 }
5037                                 return (op_err);
5038                                 break;
5039                         }
5040                 default:
5041                         /*
5042                          * we do not recognize the parameter figure out what
5043                          * we do.
5044                          */
5045                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5046                         if ((ptype & 0x4000) == 0x4000) {
5047                                 /* Report bit is set?? */
5048                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5049                                 if (op_err == NULL) {
5050                                         int l_len;
5051
5052                                         /* Ok need to try to get an mbuf */
5053 #ifdef INET6
5054                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5055 #else
5056                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5057 #endif
5058                                         l_len += plen;
5059                                         l_len += sizeof(struct sctp_paramhdr);
5060                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5061                                         if (op_err) {
5062                                                 SCTP_BUF_LEN(op_err) = 0;
5063 #ifdef INET6
5064                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5065 #else
5066                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5067 #endif
5068                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5069                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5070                                         }
5071                                 }
5072                                 if (op_err) {
5073                                         /* If we have space */
5074                                         struct sctp_paramhdr s;
5075
5076                                         if (err_at % 4) {
5077                                                 uint32_t cpthis = 0;
5078
5079                                                 pad_needed = 4 - (err_at % 4);
5080                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5081                                                 err_at += pad_needed;
5082                                         }
5083                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5084                                         s.param_length = htons(sizeof(s) + plen);
5085                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5086                                         err_at += sizeof(s);
5087                                         if (plen > sizeof(tempbuf)) {
5088                                                 plen = sizeof(tempbuf);
5089                                         }
5090                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5091                                         if (phdr == NULL) {
5092                                                 sctp_m_freem(op_err);
5093                                                 /*
5094                                                  * we are out of memory but
5095                                                  * we still need to have a
5096                                                  * look at what to do (the
5097                                                  * system is in trouble
5098                                                  * though).
5099                                                  */
5100                                                 op_err = NULL;
5101                                                 goto more_processing;
5102                                         }
5103                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5104                                         err_at += plen;
5105                                 }
5106                         }
5107         more_processing:
5108                         if ((ptype & 0x8000) == 0x0000) {
5109                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5110                                 return (op_err);
5111                         } else {
5112                                 /* skip this chunk and continue processing */
5113                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5114                                 at += SCTP_SIZE32(plen);
5115                         }
5116                         break;
5117
5118                 }
5119                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5120         }
5121         return (op_err);
5122 invalid_size:
5123         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5124         *abort_processing = 1;
5125         if ((op_err == NULL) && phdr) {
5126                 int l_len;
5127
5128 #ifdef INET6
5129                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5130 #else
5131                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5132 #endif
5133                 l_len += (2 * sizeof(struct sctp_paramhdr));
5134                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5135                 if (op_err) {
5136                         SCTP_BUF_LEN(op_err) = 0;
5137 #ifdef INET6
5138                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5139 #else
5140                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5141 #endif
5142                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5143                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5144                 }
5145         }
5146         if ((op_err) && phdr) {
5147                 struct sctp_paramhdr s;
5148
5149                 if (err_at % 4) {
5150                         uint32_t cpthis = 0;
5151
5152                         pad_needed = 4 - (err_at % 4);
5153                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5154                         err_at += pad_needed;
5155                 }
5156                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5157                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5158                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5159                 err_at += sizeof(s);
5160                 /* Only copy back the p-hdr that caused the issue */
5161                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5162         }
5163         return (op_err);
5164 }
5165
5166 static int
5167 sctp_are_there_new_addresses(struct sctp_association *asoc,
5168     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5169 {
5170         /*
5171          * Given a INIT packet, look through the packet to verify that there
5172          * are NO new addresses. As we go through the parameters add reports
5173          * of any un-understood parameters that require an error.  Also we
5174          * must return (1) to drop the packet if we see a un-understood
5175          * parameter that tells us to drop the chunk.
5176          */
5177         struct sockaddr *sa_touse;
5178         struct sockaddr *sa;
5179         struct sctp_paramhdr *phdr, params;
5180         uint16_t ptype, plen;
5181         uint8_t fnd;
5182         struct sctp_nets *net;
5183
5184 #ifdef INET
5185         struct sockaddr_in sin4, *sa4;
5186
5187 #endif
5188 #ifdef INET6
5189         struct sockaddr_in6 sin6, *sa6;
5190
5191 #endif
5192
5193 #ifdef INET
5194         memset(&sin4, 0, sizeof(sin4));
5195         sin4.sin_family = AF_INET;
5196         sin4.sin_len = sizeof(sin4);
5197 #endif
5198 #ifdef INET6
5199         memset(&sin6, 0, sizeof(sin6));
5200         sin6.sin6_family = AF_INET6;
5201         sin6.sin6_len = sizeof(sin6);
5202 #endif
5203         /* First what about the src address of the pkt ? */
5204         fnd = 0;
5205         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5206                 sa = (struct sockaddr *)&net->ro._l_addr;
5207                 if (sa->sa_family == src->sa_family) {
5208 #ifdef INET
5209                         if (sa->sa_family == AF_INET) {
5210                                 struct sockaddr_in *src4;
5211
5212                                 sa4 = (struct sockaddr_in *)sa;
5213                                 src4 = (struct sockaddr_in *)src;
5214                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5215                                         fnd = 1;
5216                                         break;
5217                                 }
5218                         }
5219 #endif
5220 #ifdef INET6
5221                         if (sa->sa_family == AF_INET6) {
5222                                 struct sockaddr_in6 *src6;
5223
5224                                 sa6 = (struct sockaddr_in6 *)sa;
5225                                 src6 = (struct sockaddr_in6 *)src;
5226                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5227                                         fnd = 1;
5228                                         break;
5229                                 }
5230                         }
5231 #endif
5232                 }
5233         }
5234         if (fnd == 0) {
5235                 /* New address added! no need to look futher. */
5236                 return (1);
5237         }
5238         /* Ok so far lets munge through the rest of the packet */
5239         offset += sizeof(struct sctp_init_chunk);
5240         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5241         while (phdr) {
5242                 sa_touse = NULL;
5243                 ptype = ntohs(phdr->param_type);
5244                 plen = ntohs(phdr->param_length);
5245                 switch (ptype) {
5246 #ifdef INET
5247                 case SCTP_IPV4_ADDRESS:
5248                         {
5249                                 struct sctp_ipv4addr_param *p4, p4_buf;
5250
5251                                 phdr = sctp_get_next_param(in_initpkt, offset,
5252                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5253                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5254                                     phdr == NULL) {
5255                                         return (1);
5256                                 }
5257                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5258                                 sin4.sin_addr.s_addr = p4->addr;
5259                                 sa_touse = (struct sockaddr *)&sin4;
5260                                 break;
5261                         }
5262 #endif
5263 #ifdef INET6
5264                 case SCTP_IPV6_ADDRESS:
5265                         {
5266                                 struct sctp_ipv6addr_param *p6, p6_buf;
5267
5268                                 phdr = sctp_get_next_param(in_initpkt, offset,
5269                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5270                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5271                                     phdr == NULL) {
5272                                         return (1);
5273                                 }
5274                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5275                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5276                                     sizeof(p6->addr));
5277                                 sa_touse = (struct sockaddr *)&sin6;
5278                                 break;
5279                         }
5280 #endif
5281                 default:
5282                         sa_touse = NULL;
5283                         break;
5284                 }
5285                 if (sa_touse) {
5286                         /* ok, sa_touse points to one to check */
5287                         fnd = 0;
5288                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5289                                 sa = (struct sockaddr *)&net->ro._l_addr;
5290                                 if (sa->sa_family != sa_touse->sa_family) {
5291                                         continue;
5292                                 }
5293 #ifdef INET
5294                                 if (sa->sa_family == AF_INET) {
5295                                         sa4 = (struct sockaddr_in *)sa;
5296                                         if (sa4->sin_addr.s_addr ==
5297                                             sin4.sin_addr.s_addr) {
5298                                                 fnd = 1;
5299                                                 break;
5300                                         }
5301                                 }
5302 #endif
5303 #ifdef INET6
5304                                 if (sa->sa_family == AF_INET6) {
5305                                         sa6 = (struct sockaddr_in6 *)sa;
5306                                         if (SCTP6_ARE_ADDR_EQUAL(
5307                                             sa6, &sin6)) {
5308                                                 fnd = 1;
5309                                                 break;
5310                                         }
5311                                 }
5312 #endif
5313                         }
5314                         if (!fnd) {
5315                                 /* New addr added! no need to look further */
5316                                 return (1);
5317                         }
5318                 }
5319                 offset += SCTP_SIZE32(plen);
5320                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5321         }
5322         return (0);
5323 }
5324
5325 /*
5326  * Given a MBUF chain that was sent into us containing an INIT. Build a
5327  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5328  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5329  * message (i.e. the struct sctp_init_msg).
5330  */
5331 void
5332 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5333     struct mbuf *init_pkt, int iphlen, int offset,
5334     struct sockaddr *src, struct sockaddr *dst,
5335     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5336     uint8_t use_mflowid, uint32_t mflowid,
5337     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5338 {
5339         struct sctp_association *asoc;
5340         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5341         struct sctp_init_ack_chunk *initack;
5342         struct sctp_adaptation_layer_indication *ali;
5343         struct sctp_ecn_supported_param *ecn;
5344         struct sctp_prsctp_supported_param *prsctp;
5345         struct sctp_supported_chunk_types_param *pr_supported;
5346         union sctp_sockstore *over_addr;
5347
5348 #ifdef INET
5349         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5350         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5351         struct sockaddr_in *sin;
5352
5353 #endif
5354 #ifdef INET6
5355         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5356         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5357         struct sockaddr_in6 *sin6;
5358
5359 #endif
5360         struct sockaddr *to;
5361         struct sctp_state_cookie stc;
5362         struct sctp_nets *net = NULL;
5363         uint8_t *signature = NULL;
5364         int cnt_inits_to = 0;
5365         uint16_t his_limit, i_want;
5366         int abort_flag, padval;
5367         int num_ext;
5368         int p_len;
5369         int nat_friendly = 0;
5370         struct socket *so;
5371
5372         if (stcb) {
5373                 asoc = &stcb->asoc;
5374         } else {
5375                 asoc = NULL;
5376         }
5377         mp_last = NULL;
5378         if ((asoc != NULL) &&
5379             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5380             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5381                 /* new addresses, out of here in non-cookie-wait states */
5382                 /*
5383                  * Send a ABORT, we don't add the new address error clause
5384                  * though we even set the T bit and copy in the 0 tag.. this
5385                  * looks no different than if no listener was present.
5386                  */
5387                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, NULL,
5388                     use_mflowid, mflowid,
5389                     vrf_id, port);
5390                 return;
5391         }
5392         abort_flag = 0;
5393         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5394             (offset + sizeof(struct sctp_init_chunk)),
5395             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5396         if (abort_flag) {
5397 do_a_abort:
5398                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5399                     init_chk->init.initiate_tag, op_err,
5400                     use_mflowid, mflowid,
5401                     vrf_id, port);
5402                 return;
5403         }
5404         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5405         if (m == NULL) {
5406                 /* No memory, INIT timer will re-attempt. */
5407                 if (op_err)
5408                         sctp_m_freem(op_err);
5409                 return;
5410         }
5411         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5412
5413         /*
5414          * We might not overwrite the identification[] completely and on
5415          * some platforms time_entered will contain some padding. Therefore
5416          * zero out the cookie to avoid putting uninitialized memory on the
5417          * wire.
5418          */
5419         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5420
5421         /* the time I built cookie */
5422         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5423
5424         /* populate any tie tags */
5425         if (asoc != NULL) {
5426                 /* unlock before tag selections */
5427                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5428                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5429                 stc.cookie_life = asoc->cookie_life;
5430                 net = asoc->primary_destination;
5431         } else {
5432                 stc.tie_tag_my_vtag = 0;
5433                 stc.tie_tag_peer_vtag = 0;
5434                 /* life I will award this cookie */
5435                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5436         }
5437
5438         /* copy in the ports for later check */
5439         stc.myport = sh->dest_port;
5440         stc.peerport = sh->src_port;
5441
5442         /*
5443          * If we wanted to honor cookie life extentions, we would add to
5444          * stc.cookie_life. For now we should NOT honor any extension
5445          */
5446         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5447         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5448                 stc.ipv6_addr_legal = 1;
5449                 if (SCTP_IPV6_V6ONLY(inp)) {
5450                         stc.ipv4_addr_legal = 0;
5451                 } else {
5452                         stc.ipv4_addr_legal = 1;
5453                 }
5454         } else {
5455                 stc.ipv6_addr_legal = 0;
5456                 stc.ipv4_addr_legal = 1;
5457         }
5458 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5459         stc.ipv4_scope = 1;
5460 #else
5461         stc.ipv4_scope = 0;
5462 #endif
5463         if (net == NULL) {
5464                 to = src;
5465                 switch (dst->sa_family) {
5466 #ifdef INET
5467                 case AF_INET:
5468                         {
5469                                 /* lookup address */
5470                                 stc.address[0] = src4->sin_addr.s_addr;
5471                                 stc.address[1] = 0;
5472                                 stc.address[2] = 0;
5473                                 stc.address[3] = 0;
5474                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5475                                 /* local from address */
5476                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5477                                 stc.laddress[1] = 0;
5478                                 stc.laddress[2] = 0;
5479                                 stc.laddress[3] = 0;
5480                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5481                                 /* scope_id is only for v6 */
5482                                 stc.scope_id = 0;
5483 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5484                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5485                                         stc.ipv4_scope = 1;
5486                                 }
5487 #else
5488                                 stc.ipv4_scope = 1;
5489 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5490                                 /* Must use the address in this case */
5491                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5492                                         stc.loopback_scope = 1;
5493                                         stc.ipv4_scope = 1;
5494                                         stc.site_scope = 1;
5495                                         stc.local_scope = 0;
5496                                 }
5497                                 break;
5498                         }
5499 #endif
5500 #ifdef INET6
5501                 case AF_INET6:
5502                         {
5503                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5504                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5505                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5506                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5507                                         stc.loopback_scope = 1;
5508                                         stc.local_scope = 0;
5509                                         stc.site_scope = 1;
5510                                         stc.ipv4_scope = 1;
5511                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5512                                         /*
5513                                          * If the new destination is a
5514                                          * LINK_LOCAL we must have common
5515                                          * both site and local scope. Don't
5516                                          * set local scope though since we
5517                                          * must depend on the source to be
5518                                          * added implicitly. We cannot
5519                                          * assure just because we share one
5520                                          * link that all links are common.
5521                                          */
5522                                         stc.local_scope = 0;
5523                                         stc.site_scope = 1;
5524                                         stc.ipv4_scope = 1;
5525                                         /*
5526                                          * we start counting for the private
5527                                          * address stuff at 1. since the
5528                                          * link local we source from won't
5529                                          * show up in our scoped count.
5530                                          */
5531                                         cnt_inits_to = 1;
5532                                         /*
5533                                          * pull out the scope_id from
5534                                          * incoming pkt
5535                                          */
5536                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5537                                         /*
5538                                          * If the new destination is
5539                                          * SITE_LOCAL then we must have site
5540                                          * scope in common.
5541                                          */
5542                                         stc.site_scope = 1;
5543                                 }
5544                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5545                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5546                                 break;
5547                         }
5548 #endif
5549                 default:
5550                         /* TSNH */
5551                         goto do_a_abort;
5552                         break;
5553                 }
5554         } else {
5555                 /* set the scope per the existing tcb */
5556
5557 #ifdef INET6
5558                 struct sctp_nets *lnet;
5559
5560 #endif
5561
5562                 stc.loopback_scope = asoc->scope.loopback_scope;
5563                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
5564                 stc.site_scope = asoc->scope.site_scope;
5565                 stc.local_scope = asoc->scope.local_scope;
5566 #ifdef INET6
5567                 /* Why do we not consider IPv4 LL addresses? */
5568                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5569                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5570                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5571                                         /*
5572                                          * if we have a LL address, start
5573                                          * counting at 1.
5574                                          */
5575                                         cnt_inits_to = 1;
5576                                 }
5577                         }
5578                 }
5579 #endif
5580                 /* use the net pointer */
5581                 to = (struct sockaddr *)&net->ro._l_addr;
5582                 switch (to->sa_family) {
5583 #ifdef INET
5584                 case AF_INET:
5585                         sin = (struct sockaddr_in *)to;
5586                         stc.address[0] = sin->sin_addr.s_addr;
5587                         stc.address[1] = 0;
5588                         stc.address[2] = 0;
5589                         stc.address[3] = 0;
5590                         stc.addr_type = SCTP_IPV4_ADDRESS;
5591                         if (net->src_addr_selected == 0) {
5592                                 /*
5593                                  * strange case here, the INIT should have
5594                                  * did the selection.
5595                                  */
5596                                 net->ro._s_addr = sctp_source_address_selection(inp,
5597                                     stcb, (sctp_route_t *) & net->ro,
5598                                     net, 0, vrf_id);
5599                                 if (net->ro._s_addr == NULL)
5600                                         return;
5601
5602                                 net->src_addr_selected = 1;
5603
5604                         }
5605                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5606                         stc.laddress[1] = 0;
5607                         stc.laddress[2] = 0;
5608                         stc.laddress[3] = 0;
5609                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5610                         /* scope_id is only for v6 */
5611                         stc.scope_id = 0;
5612                         break;
5613 #endif
5614 #ifdef INET6
5615                 case AF_INET6:
5616                         sin6 = (struct sockaddr_in6 *)to;
5617                         memcpy(&stc.address, &sin6->sin6_addr,
5618                             sizeof(struct in6_addr));
5619                         stc.addr_type = SCTP_IPV6_ADDRESS;
5620                         stc.scope_id = sin6->sin6_scope_id;
5621                         if (net->src_addr_selected == 0) {
5622                                 /*
5623                                  * strange case here, the INIT should have
5624                                  * done the selection.
5625                                  */
5626                                 net->ro._s_addr = sctp_source_address_selection(inp,
5627                                     stcb, (sctp_route_t *) & net->ro,
5628                                     net, 0, vrf_id);
5629                                 if (net->ro._s_addr == NULL)
5630                                         return;
5631
5632                                 net->src_addr_selected = 1;
5633                         }
5634                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5635                             sizeof(struct in6_addr));
5636                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5637                         break;
5638 #endif
5639                 }
5640         }
5641         /* Now lets put the SCTP header in place */
5642         initack = mtod(m, struct sctp_init_ack_chunk *);
5643         /* Save it off for quick ref */
5644         stc.peers_vtag = init_chk->init.initiate_tag;
5645         /* who are we */
5646         memcpy(stc.identification, SCTP_VERSION_STRING,
5647             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5648         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5649         /* now the chunk header */
5650         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5651         initack->ch.chunk_flags = 0;
5652         /* fill in later from mbuf we build */
5653         initack->ch.chunk_length = 0;
5654         /* place in my tag */
5655         if ((asoc != NULL) &&
5656             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5657             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5658             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5659                 /* re-use the v-tags and init-seq here */
5660                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5661                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5662         } else {
5663                 uint32_t vtag, itsn;
5664
5665                 if (hold_inp_lock) {
5666                         SCTP_INP_INCR_REF(inp);
5667                         SCTP_INP_RUNLOCK(inp);
5668                 }
5669                 if (asoc) {
5670                         atomic_add_int(&asoc->refcnt, 1);
5671                         SCTP_TCB_UNLOCK(stcb);
5672         new_tag:
5673                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5674                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5675                                 /*
5676                                  * Got a duplicate vtag on some guy behind a
5677                                  * nat make sure we don't use it.
5678                                  */
5679                                 goto new_tag;
5680                         }
5681                         initack->init.initiate_tag = htonl(vtag);
5682                         /* get a TSN to use too */
5683                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5684                         initack->init.initial_tsn = htonl(itsn);
5685                         SCTP_TCB_LOCK(stcb);
5686                         atomic_add_int(&asoc->refcnt, -1);
5687                 } else {
5688                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5689                         initack->init.initiate_tag = htonl(vtag);
5690                         /* get a TSN to use too */
5691                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5692                 }
5693                 if (hold_inp_lock) {
5694                         SCTP_INP_RLOCK(inp);
5695                         SCTP_INP_DECR_REF(inp);
5696                 }
5697         }
5698         /* save away my tag to */
5699         stc.my_vtag = initack->init.initiate_tag;
5700
5701         /* set up some of the credits. */
5702         so = inp->sctp_socket;
5703         if (so == NULL) {
5704                 /* memory problem */
5705                 sctp_m_freem(m);
5706                 return;
5707         } else {
5708                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5709         }
5710         /* set what I want */
5711         his_limit = ntohs(init_chk->init.num_inbound_streams);
5712         /* choose what I want */
5713         if (asoc != NULL) {
5714                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5715                         i_want = asoc->streamoutcnt;
5716                 } else {
5717                         i_want = inp->sctp_ep.pre_open_stream_count;
5718                 }
5719         } else {
5720                 i_want = inp->sctp_ep.pre_open_stream_count;
5721         }
5722         if (his_limit < i_want) {
5723                 /* I Want more :< */
5724                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5725         } else {
5726                 /* I can have what I want :> */
5727                 initack->init.num_outbound_streams = htons(i_want);
5728         }
5729         /* tell him his limit. */
5730         initack->init.num_inbound_streams =
5731             htons(inp->sctp_ep.max_open_streams_intome);
5732
5733         /* adaptation layer indication parameter */
5734         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
5735                 ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5736                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5737                 ali->ph.param_length = htons(sizeof(*ali));
5738                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5739                 SCTP_BUF_LEN(m) += sizeof(*ali);
5740                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5741         } else {
5742                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)initack + sizeof(*initack));
5743         }
5744
5745         /* ECN parameter */
5746         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5747             (inp->sctp_ecn_enable == 1)) {
5748                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5749                 ecn->ph.param_length = htons(sizeof(*ecn));
5750                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5751
5752                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5753                     sizeof(*ecn));
5754         } else {
5755                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5756         }
5757         /* And now tell the peer we do  pr-sctp */
5758         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5759         prsctp->ph.param_length = htons(sizeof(*prsctp));
5760         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5761         if (nat_friendly) {
5762                 /* Add NAT friendly parameter */
5763                 struct sctp_paramhdr *ph;
5764
5765                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5766                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5767                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5768                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5769         }
5770         /* And now tell the peer we do all the extensions */
5771         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5772         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5773         num_ext = 0;
5774         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5775         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5776         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5777         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5778         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5779         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5780                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5781         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5782                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5783         p_len = sizeof(*pr_supported) + num_ext;
5784         pr_supported->ph.param_length = htons(p_len);
5785         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5786         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5787
5788         /* add authentication parameters */
5789         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5790                 struct sctp_auth_random *randp;
5791                 struct sctp_auth_hmac_algo *hmacs;
5792                 struct sctp_auth_chunk_list *chunks;
5793                 uint16_t random_len;
5794
5795                 /* generate and add RANDOM parameter */
5796                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5797                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5798                 randp->ph.param_type = htons(SCTP_RANDOM);
5799                 p_len = sizeof(*randp) + random_len;
5800                 randp->ph.param_length = htons(p_len);
5801                 SCTP_READ_RANDOM(randp->random_data, random_len);
5802                 /* zero out any padding required */
5803                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5804                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5805
5806                 /* add HMAC_ALGO parameter */
5807                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5808                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5809                     (uint8_t *) hmacs->hmac_ids);
5810                 if (p_len > 0) {
5811                         p_len += sizeof(*hmacs);
5812                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5813                         hmacs->ph.param_length = htons(p_len);
5814                         /* zero out any padding required */
5815                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5816                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5817                 }
5818                 /* add CHUNKS parameter */
5819                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5820                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5821                     chunks->chunk_types);
5822                 if (p_len > 0) {
5823                         p_len += sizeof(*chunks);
5824                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5825                         chunks->ph.param_length = htons(p_len);
5826                         /* zero out any padding required */
5827                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5828                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5829                 }
5830         }
5831         m_at = m;
5832         /* now the addresses */
5833         {
5834                 struct sctp_scoping scp;
5835
5836                 /*
5837                  * To optimize this we could put the scoping stuff into a
5838                  * structure and remove the individual uint8's from the stc
5839                  * structure. Then we could just sifa in the address within
5840                  * the stc.. but for now this is a quick hack to get the
5841                  * address stuff teased apart.
5842                  */
5843                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5844                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5845                 scp.loopback_scope = stc.loopback_scope;
5846                 scp.ipv4_local_scope = stc.ipv4_scope;
5847                 scp.local_scope = stc.local_scope;
5848                 scp.site_scope = stc.site_scope;
5849                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to, NULL, NULL);
5850         }
5851
5852         /* tack on the operational error if present */
5853         if (op_err) {
5854                 struct mbuf *ol;
5855                 int llen;
5856
5857                 llen = 0;
5858                 ol = op_err;
5859
5860                 while (ol) {
5861                         llen += SCTP_BUF_LEN(ol);
5862                         ol = SCTP_BUF_NEXT(ol);
5863                 }
5864                 if (llen % 4) {
5865                         /* must add a pad to the param */
5866                         uint32_t cpthis = 0;
5867                         int padlen;
5868
5869                         padlen = 4 - (llen % 4);
5870                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5871                 }
5872                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5873                         m_at = SCTP_BUF_NEXT(m_at);
5874                 }
5875                 SCTP_BUF_NEXT(m_at) = op_err;
5876                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5877                         m_at = SCTP_BUF_NEXT(m_at);
5878                 }
5879         }
5880         /* pre-calulate the size and update pkt header and chunk header */
5881         p_len = 0;
5882         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5883                 p_len += SCTP_BUF_LEN(m_tmp);
5884                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5885                         /* m_tmp should now point to last one */
5886                         break;
5887                 }
5888         }
5889
5890         /* Now we must build a cookie */
5891         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5892         if (m_cookie == NULL) {
5893                 /* memory problem */
5894                 sctp_m_freem(m);
5895                 return;
5896         }
5897         /* Now append the cookie to the end and update the space/size */
5898         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5899
5900         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5901                 p_len += SCTP_BUF_LEN(m_tmp);
5902                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5903                         /* m_tmp should now point to last one */
5904                         mp_last = m_tmp;
5905                         break;
5906                 }
5907         }
5908         /*
5909          * Place in the size, but we don't include the last pad (if any) in
5910          * the INIT-ACK.
5911          */
5912         initack->ch.chunk_length = htons(p_len);
5913
5914         /*
5915          * Time to sign the cookie, we don't sign over the cookie signature
5916          * though thus we set trailer.
5917          */
5918         (void)sctp_hmac_m(SCTP_HMAC,
5919             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5920             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5921             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5922         /*
5923          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5924          * here since the timer will drive a retranmission.
5925          */
5926         padval = p_len % 4;
5927         if ((padval) && (mp_last)) {
5928                 /* see my previous comments on mp_last */
5929                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
5930                         /* Houston we have a problem, no space */
5931                         sctp_m_freem(m);
5932                         return;
5933                 }
5934         }
5935         if (stc.loopback_scope) {
5936                 over_addr = (union sctp_sockstore *)dst;
5937         } else {
5938                 over_addr = NULL;
5939         }
5940
5941         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5942             0, 0,
5943             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5944             port, over_addr,
5945             use_mflowid, mflowid,
5946             SCTP_SO_NOT_LOCKED);
5947         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5948 }
5949
5950
5951 static void
5952 sctp_prune_prsctp(struct sctp_tcb *stcb,
5953     struct sctp_association *asoc,
5954     struct sctp_sndrcvinfo *srcv,
5955     int dataout)
5956 {
5957         int freed_spc = 0;
5958         struct sctp_tmit_chunk *chk, *nchk;
5959
5960         SCTP_TCB_LOCK_ASSERT(stcb);
5961         if ((asoc->peer_supports_prsctp) &&
5962             (asoc->sent_queue_cnt_removeable > 0)) {
5963                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5964                         /*
5965                          * Look for chunks marked with the PR_SCTP flag AND
5966                          * the buffer space flag. If the one being sent is
5967                          * equal or greater priority then purge the old one
5968                          * and free some space.
5969                          */
5970                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5971                                 /*
5972                                  * This one is PR-SCTP AND buffer space
5973                                  * limited type
5974                                  */
5975                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5976                                         /*
5977                                          * Lower numbers equates to higher
5978                                          * priority so if the one we are
5979                                          * looking at has a larger or equal
5980                                          * priority we want to drop the data
5981                                          * and NOT retransmit it.
5982                                          */
5983                                         if (chk->data) {
5984                                                 /*
5985                                                  * We release the book_size
5986                                                  * if the mbuf is here
5987                                                  */
5988                                                 int ret_spc;
5989                                                 uint8_t sent;
5990
5991                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
5992                                                         sent = 1;
5993                                                 else
5994                                                         sent = 0;
5995                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
5996                                                     sent,
5997                                                     SCTP_SO_LOCKED);
5998                                                 freed_spc += ret_spc;
5999                                                 if (freed_spc >= dataout) {
6000                                                         return;
6001                                                 }
6002                                         }       /* if chunk was present */
6003                                 }       /* if of sufficent priority */
6004                         }       /* if chunk has enabled */
6005                 }               /* tailqforeach */
6006
6007                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6008                         /* Here we must move to the sent queue and mark */
6009                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6010                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6011                                         if (chk->data) {
6012                                                 /*
6013                                                  * We release the book_size
6014                                                  * if the mbuf is here
6015                                                  */
6016                                                 int ret_spc;
6017
6018                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6019                                                     0, SCTP_SO_LOCKED);
6020
6021                                                 freed_spc += ret_spc;
6022                                                 if (freed_spc >= dataout) {
6023                                                         return;
6024                                                 }
6025                                         }       /* end if chk->data */
6026                                 }       /* end if right class */
6027                         }       /* end if chk pr-sctp */
6028                 }               /* tailqforeachsafe (chk) */
6029         }                       /* if enabled in asoc */
6030 }
6031
6032 int
6033 sctp_get_frag_point(struct sctp_tcb *stcb,
6034     struct sctp_association *asoc)
6035 {
6036         int siz, ovh;
6037
6038         /*
6039          * For endpoints that have both v6 and v4 addresses we must reserve
6040          * room for the ipv6 header, for those that are only dealing with V4
6041          * we use a larger frag point.
6042          */
6043         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6044                 ovh = SCTP_MED_OVERHEAD;
6045         } else {
6046                 ovh = SCTP_MED_V4_OVERHEAD;
6047         }
6048
6049         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6050                 siz = asoc->smallest_mtu - ovh;
6051         else
6052                 siz = (stcb->asoc.sctp_frag_point - ovh);
6053         /*
6054          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6055          */
6056         /* A data chunk MUST fit in a cluster */
6057         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6058         /* } */
6059
6060         /* adjust for an AUTH chunk if DATA requires auth */
6061         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6062                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6063
6064         if (siz % 4) {
6065                 /* make it an even word boundary please */
6066                 siz -= (siz % 4);
6067         }
6068         return (siz);
6069 }
6070
6071 static void
6072 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6073 {
6074         sp->pr_sctp_on = 0;
6075         /*
6076          * We assume that the user wants PR_SCTP_TTL if the user provides a
6077          * positive lifetime but does not specify any PR_SCTP policy. This
6078          * is a BAD assumption and causes problems at least with the
6079          * U-Vancovers MPI folks. I will change this to be no policy means
6080          * NO PR-SCTP.
6081          */
6082         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6083                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6084                 sp->pr_sctp_on = 1;
6085         } else {
6086                 return;
6087         }
6088         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6089         case CHUNK_FLAGS_PR_SCTP_BUF:
6090                 /*
6091                  * Time to live is a priority stored in tv_sec when doing
6092                  * the buffer drop thing.
6093                  */
6094                 sp->ts.tv_sec = sp->timetolive;
6095                 sp->ts.tv_usec = 0;
6096                 break;
6097         case CHUNK_FLAGS_PR_SCTP_TTL:
6098                 {
6099                         struct timeval tv;
6100
6101                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6102                         tv.tv_sec = sp->timetolive / 1000;
6103                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6104                         /*
6105                          * TODO sctp_constants.h needs alternative time
6106                          * macros when _KERNEL is undefined.
6107                          */
6108                         timevaladd(&sp->ts, &tv);
6109                 }
6110                 break;
6111         case CHUNK_FLAGS_PR_SCTP_RTX:
6112                 /*
6113                  * Time to live is a the number or retransmissions stored in
6114                  * tv_sec.
6115                  */
6116                 sp->ts.tv_sec = sp->timetolive;
6117                 sp->ts.tv_usec = 0;
6118                 break;
6119         default:
6120                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6121                     "Unknown PR_SCTP policy %u.\n",
6122                     PR_SCTP_POLICY(sp->sinfo_flags));
6123                 break;
6124         }
6125 }
6126
6127 static int
6128 sctp_msg_append(struct sctp_tcb *stcb,
6129     struct sctp_nets *net,
6130     struct mbuf *m,
6131     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6132 {
6133         int error = 0;
6134         struct mbuf *at;
6135         struct sctp_stream_queue_pending *sp = NULL;
6136         struct sctp_stream_out *strm;
6137
6138         /*
6139          * Given an mbuf chain, put it into the association send queue and
6140          * place it on the wheel
6141          */
6142         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6143                 /* Invalid stream number */
6144                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6145                 error = EINVAL;
6146                 goto out_now;
6147         }
6148         if ((stcb->asoc.stream_locked) &&
6149             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6150                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6151                 error = EINVAL;
6152                 goto out_now;
6153         }
6154         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6155         /* Now can we send this? */
6156         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6157             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6158             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6159             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6160                 /* got data while shutting down */
6161                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6162                 error = ECONNRESET;
6163                 goto out_now;
6164         }
6165         sctp_alloc_a_strmoq(stcb, sp);
6166         if (sp == NULL) {
6167                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6168                 error = ENOMEM;
6169                 goto out_now;
6170         }
6171         sp->sinfo_flags = srcv->sinfo_flags;
6172         sp->timetolive = srcv->sinfo_timetolive;
6173         sp->ppid = srcv->sinfo_ppid;
6174         sp->context = srcv->sinfo_context;
6175         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6176                 sp->net = net;
6177                 atomic_add_int(&sp->net->ref_count, 1);
6178         } else {
6179                 sp->net = NULL;
6180         }
6181         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6182         sp->stream = srcv->sinfo_stream;
6183         sp->msg_is_complete = 1;
6184         sp->sender_all_done = 1;
6185         sp->some_taken = 0;
6186         sp->data = m;
6187         sp->tail_mbuf = NULL;
6188         sctp_set_prsctp_policy(sp);
6189         /*
6190          * We could in theory (for sendall) sifa the length in, but we would
6191          * still have to hunt through the chain since we need to setup the
6192          * tail_mbuf
6193          */
6194         sp->length = 0;
6195         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6196                 if (SCTP_BUF_NEXT(at) == NULL)
6197                         sp->tail_mbuf = at;
6198                 sp->length += SCTP_BUF_LEN(at);
6199         }
6200         if (srcv->sinfo_keynumber_valid) {
6201                 sp->auth_keyid = srcv->sinfo_keynumber;
6202         } else {
6203                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6204         }
6205         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6206                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6207                 sp->holds_key_ref = 1;
6208         }
6209         if (hold_stcb_lock == 0) {
6210                 SCTP_TCB_SEND_LOCK(stcb);
6211         }
6212         sctp_snd_sb_alloc(stcb, sp->length);
6213         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6214         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6215         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6216         m = NULL;
6217         if (hold_stcb_lock == 0) {
6218                 SCTP_TCB_SEND_UNLOCK(stcb);
6219         }
6220 out_now:
6221         if (m) {
6222                 sctp_m_freem(m);
6223         }
6224         return (error);
6225 }
6226
6227
6228 static struct mbuf *
6229 sctp_copy_mbufchain(struct mbuf *clonechain,
6230     struct mbuf *outchain,
6231     struct mbuf **endofchain,
6232     int can_take_mbuf,
6233     int sizeofcpy,
6234     uint8_t copy_by_ref)
6235 {
6236         struct mbuf *m;
6237         struct mbuf *appendchain;
6238         caddr_t cp;
6239         int len;
6240
6241         if (endofchain == NULL) {
6242                 /* error */
6243 error_out:
6244                 if (outchain)
6245                         sctp_m_freem(outchain);
6246                 return (NULL);
6247         }
6248         if (can_take_mbuf) {
6249                 appendchain = clonechain;
6250         } else {
6251                 if (!copy_by_ref &&
6252                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6253                     ) {
6254                         /* Its not in a cluster */
6255                         if (*endofchain == NULL) {
6256                                 /* lets get a mbuf cluster */
6257                                 if (outchain == NULL) {
6258                                         /* This is the general case */
6259                         new_mbuf:
6260                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6261                                         if (outchain == NULL) {
6262                                                 goto error_out;
6263                                         }
6264                                         SCTP_BUF_LEN(outchain) = 0;
6265                                         *endofchain = outchain;
6266                                         /* get the prepend space */
6267                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6268                                 } else {
6269                                         /*
6270                                          * We really should not get a NULL
6271                                          * in endofchain
6272                                          */
6273                                         /* find end */
6274                                         m = outchain;
6275                                         while (m) {
6276                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6277                                                         *endofchain = m;
6278                                                         break;
6279                                                 }
6280                                                 m = SCTP_BUF_NEXT(m);
6281                                         }
6282                                         /* sanity */
6283                                         if (*endofchain == NULL) {
6284                                                 /*
6285                                                  * huh, TSNH XXX maybe we
6286                                                  * should panic
6287                                                  */
6288                                                 sctp_m_freem(outchain);
6289                                                 goto new_mbuf;
6290                                         }
6291                                 }
6292                                 /* get the new end of length */
6293                                 len = M_TRAILINGSPACE(*endofchain);
6294                         } else {
6295                                 /* how much is left at the end? */
6296                                 len = M_TRAILINGSPACE(*endofchain);
6297                         }
6298                         /* Find the end of the data, for appending */
6299                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6300
6301                         /* Now lets copy it out */
6302                         if (len >= sizeofcpy) {
6303                                 /* It all fits, copy it in */
6304                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6305                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6306                         } else {
6307                                 /* fill up the end of the chain */
6308                                 if (len > 0) {
6309                                         m_copydata(clonechain, 0, len, cp);
6310                                         SCTP_BUF_LEN((*endofchain)) += len;
6311                                         /* now we need another one */
6312                                         sizeofcpy -= len;
6313                                 }
6314                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6315                                 if (m == NULL) {
6316                                         /* We failed */
6317                                         goto error_out;
6318                                 }
6319                                 SCTP_BUF_NEXT((*endofchain)) = m;
6320                                 *endofchain = m;
6321                                 cp = mtod((*endofchain), caddr_t);
6322                                 m_copydata(clonechain, len, sizeofcpy, cp);
6323                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6324                         }
6325                         return (outchain);
6326                 } else {
6327                         /* copy the old fashion way */
6328                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6329 #ifdef SCTP_MBUF_LOGGING
6330                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6331                                 struct mbuf *mat;
6332
6333                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6334                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6335                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6336                                         }
6337                                 }
6338                         }
6339 #endif
6340                 }
6341         }
6342         if (appendchain == NULL) {
6343                 /* error */
6344                 if (outchain)
6345                         sctp_m_freem(outchain);
6346                 return (NULL);
6347         }
6348         if (outchain) {
6349                 /* tack on to the end */
6350                 if (*endofchain != NULL) {
6351                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6352                 } else {
6353                         m = outchain;
6354                         while (m) {
6355                                 if (SCTP_BUF_NEXT(m) == NULL) {
6356                                         SCTP_BUF_NEXT(m) = appendchain;
6357                                         break;
6358                                 }
6359                                 m = SCTP_BUF_NEXT(m);
6360                         }
6361                 }
6362                 /*
6363                  * save off the end and update the end-chain postion
6364                  */
6365                 m = appendchain;
6366                 while (m) {
6367                         if (SCTP_BUF_NEXT(m) == NULL) {
6368                                 *endofchain = m;
6369                                 break;
6370                         }
6371                         m = SCTP_BUF_NEXT(m);
6372                 }
6373                 return (outchain);
6374         } else {
6375                 /* save off the end and update the end-chain postion */
6376                 m = appendchain;
6377                 while (m) {
6378                         if (SCTP_BUF_NEXT(m) == NULL) {
6379                                 *endofchain = m;
6380                                 break;
6381                         }
6382                         m = SCTP_BUF_NEXT(m);
6383                 }
6384                 return (appendchain);
6385         }
6386 }
6387
6388 static int
6389 sctp_med_chunk_output(struct sctp_inpcb *inp,
6390     struct sctp_tcb *stcb,
6391     struct sctp_association *asoc,
6392     int *num_out,
6393     int *reason_code,
6394     int control_only, int from_where,
6395     struct timeval *now, int *now_filled, int frag_point, int so_locked
6396 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6397     SCTP_UNUSED
6398 #endif
6399 );
6400
6401 static void
6402 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6403     uint32_t val SCTP_UNUSED)
6404 {
6405         struct sctp_copy_all *ca;
6406         struct mbuf *m;
6407         int ret = 0;
6408         int added_control = 0;
6409         int un_sent, do_chunk_output = 1;
6410         struct sctp_association *asoc;
6411         struct sctp_nets *net;
6412
6413         ca = (struct sctp_copy_all *)ptr;
6414         if (ca->m == NULL) {
6415                 return;
6416         }
6417         if (ca->inp != inp) {
6418                 /* TSNH */
6419                 return;
6420         }
6421         if ((ca->m) && ca->sndlen) {
6422                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6423                 if (m == NULL) {
6424                         /* can't copy so we are done */
6425                         ca->cnt_failed++;
6426                         return;
6427                 }
6428 #ifdef SCTP_MBUF_LOGGING
6429                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6430                         struct mbuf *mat;
6431
6432                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6433                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6434                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6435                                 }
6436                         }
6437                 }
6438 #endif
6439         } else {
6440                 m = NULL;
6441         }
6442         SCTP_TCB_LOCK_ASSERT(stcb);
6443         if (stcb->asoc.alternate) {
6444                 net = stcb->asoc.alternate;
6445         } else {
6446                 net = stcb->asoc.primary_destination;
6447         }
6448         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6449                 /* Abort this assoc with m as the user defined reason */
6450                 if (m) {
6451                         struct sctp_paramhdr *ph;
6452
6453                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6454                         if (m) {
6455                                 ph = mtod(m, struct sctp_paramhdr *);
6456                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6457                                 ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
6458                         }
6459                         /*
6460                          * We add one here to keep the assoc from
6461                          * dis-appearing on us.
6462                          */
6463                         atomic_add_int(&stcb->asoc.refcnt, 1);
6464                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6465                         /*
6466                          * sctp_abort_an_association calls sctp_free_asoc()
6467                          * free association will NOT free it since we
6468                          * incremented the refcnt .. we do this to prevent
6469                          * it being freed and things getting tricky since we
6470                          * could end up (from free_asoc) calling inpcb_free
6471                          * which would get a recursive lock call to the
6472                          * iterator lock.. But as a consequence of that the
6473                          * stcb will return to us un-locked.. since
6474                          * free_asoc returns with either no TCB or the TCB
6475                          * unlocked, we must relock.. to unlock in the
6476                          * iterator timer :-0
6477                          */
6478                         SCTP_TCB_LOCK(stcb);
6479                         atomic_add_int(&stcb->asoc.refcnt, -1);
6480                         goto no_chunk_output;
6481                 }
6482         } else {
6483                 if (m) {
6484                         ret = sctp_msg_append(stcb, net, m,
6485                             &ca->sndrcv, 1);
6486                 }
6487                 asoc = &stcb->asoc;
6488                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6489                         /* shutdown this assoc */
6490                         int cnt;
6491
6492                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6493
6494                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6495                             TAILQ_EMPTY(&asoc->sent_queue) &&
6496                             (cnt == 0)) {
6497                                 if (asoc->locked_on_sending) {
6498                                         goto abort_anyway;
6499                                 }
6500                                 /*
6501                                  * there is nothing queued to send, so I'm
6502                                  * done...
6503                                  */
6504                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6505                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6506                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6507                                         /*
6508                                          * only send SHUTDOWN the first time
6509                                          * through
6510                                          */
6511                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6512                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6513                                         }
6514                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6515                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6516                                         sctp_stop_timers_for_shutdown(stcb);
6517                                         sctp_send_shutdown(stcb, net);
6518                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6519                                             net);
6520                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6521                                             asoc->primary_destination);
6522                                         added_control = 1;
6523                                         do_chunk_output = 0;
6524                                 }
6525                         } else {
6526                                 /*
6527                                  * we still got (or just got) data to send,
6528                                  * so set SHUTDOWN_PENDING
6529                                  */
6530                                 /*
6531                                  * XXX sockets draft says that SCTP_EOF
6532                                  * should be sent with no data.  currently,
6533                                  * we will allow user data to be sent first
6534                                  * and move to SHUTDOWN-PENDING
6535                                  */
6536                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6537                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6538                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6539                                         if (asoc->locked_on_sending) {
6540                                                 /*
6541                                                  * Locked to send out the
6542                                                  * data
6543                                                  */
6544                                                 struct sctp_stream_queue_pending *sp;
6545
6546                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6547                                                 if (sp) {
6548                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6549                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6550                                                 }
6551                                         }
6552                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6553                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6554                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6555                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6556                                 abort_anyway:
6557                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6558                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6559                                                     NULL, SCTP_SO_NOT_LOCKED);
6560                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6561                                                 goto no_chunk_output;
6562                                         }
6563                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6564                                             asoc->primary_destination);
6565                                 }
6566                         }
6567
6568                 }
6569         }
6570         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6571             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6572
6573         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6574             (stcb->asoc.total_flight > 0) &&
6575             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6576             ) {
6577                 do_chunk_output = 0;
6578         }
6579         if (do_chunk_output)
6580                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6581         else if (added_control) {
6582                 int num_out = 0, reason = 0, now_filled = 0;
6583                 struct timeval now;
6584                 int frag_point;
6585
6586                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6587                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6588                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6589         }
6590 no_chunk_output:
6591         if (ret) {
6592                 ca->cnt_failed++;
6593         } else {
6594                 ca->cnt_sent++;
6595         }
6596 }
6597
6598 static void
6599 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6600 {
6601         struct sctp_copy_all *ca;
6602
6603         ca = (struct sctp_copy_all *)ptr;
6604         /*
6605          * Do a notify here? Kacheong suggests that the notify be done at
6606          * the send time.. so you would push up a notification if any send
6607          * failed. Don't know if this is feasable since the only failures we
6608          * have is "memory" related and if you cannot get an mbuf to send
6609          * the data you surely can't get an mbuf to send up to notify the
6610          * user you can't send the data :->
6611          */
6612
6613         /* now free everything */
6614         sctp_m_freem(ca->m);
6615         SCTP_FREE(ca, SCTP_M_COPYAL);
6616 }
6617
6618
6619 #define MC_ALIGN(m, len) do {                                           \
6620         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6621 } while (0)
6622
6623
6624
6625 static struct mbuf *
6626 sctp_copy_out_all(struct uio *uio, int len)
6627 {
6628         struct mbuf *ret, *at;
6629         int left, willcpy, cancpy, error;
6630
6631         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6632         if (ret == NULL) {
6633                 /* TSNH */
6634                 return (NULL);
6635         }
6636         left = len;
6637         SCTP_BUF_LEN(ret) = 0;
6638         /* save space for the data chunk header */
6639         cancpy = M_TRAILINGSPACE(ret);
6640         willcpy = min(cancpy, left);
6641         at = ret;
6642         while (left > 0) {
6643                 /* Align data to the end */
6644                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6645                 if (error) {
6646         err_out_now:
6647                         sctp_m_freem(at);
6648                         return (NULL);
6649                 }
6650                 SCTP_BUF_LEN(at) = willcpy;
6651                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6652                 left -= willcpy;
6653                 if (left > 0) {
6654                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6655                         if (SCTP_BUF_NEXT(at) == NULL) {
6656                                 goto err_out_now;
6657                         }
6658                         at = SCTP_BUF_NEXT(at);
6659                         SCTP_BUF_LEN(at) = 0;
6660                         cancpy = M_TRAILINGSPACE(at);
6661                         willcpy = min(cancpy, left);
6662                 }
6663         }
6664         return (ret);
6665 }
6666
6667 static int
6668 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6669     struct sctp_sndrcvinfo *srcv)
6670 {
6671         int ret;
6672         struct sctp_copy_all *ca;
6673
6674         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6675             SCTP_M_COPYAL);
6676         if (ca == NULL) {
6677                 sctp_m_freem(m);
6678                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6679                 return (ENOMEM);
6680         }
6681         memset(ca, 0, sizeof(struct sctp_copy_all));
6682
6683         ca->inp = inp;
6684         if (srcv) {
6685                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6686         }
6687         /*
6688          * take off the sendall flag, it would be bad if we failed to do
6689          * this :-0
6690          */
6691         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6692         /* get length and mbuf chain */
6693         if (uio) {
6694                 ca->sndlen = uio->uio_resid;
6695                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6696                 if (ca->m == NULL) {
6697                         SCTP_FREE(ca, SCTP_M_COPYAL);
6698                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6699                         return (ENOMEM);
6700                 }
6701         } else {
6702                 /* Gather the length of the send */
6703                 struct mbuf *mat;
6704
6705                 mat = m;
6706                 ca->sndlen = 0;
6707                 while (m) {
6708                         ca->sndlen += SCTP_BUF_LEN(m);
6709                         m = SCTP_BUF_NEXT(m);
6710                 }
6711                 ca->m = mat;
6712         }
6713         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6714             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6715             SCTP_ASOC_ANY_STATE,
6716             (void *)ca, 0,
6717             sctp_sendall_completes, inp, 1);
6718         if (ret) {
6719                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6720                 SCTP_FREE(ca, SCTP_M_COPYAL);
6721                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6722                 return (EFAULT);
6723         }
6724         return (0);
6725 }
6726
6727
6728 void
6729 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6730 {
6731         struct sctp_tmit_chunk *chk, *nchk;
6732
6733         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6734                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6735                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6736                         if (chk->data) {
6737                                 sctp_m_freem(chk->data);
6738                                 chk->data = NULL;
6739                         }
6740                         asoc->ctrl_queue_cnt--;
6741                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6742                 }
6743         }
6744 }
6745
6746 void
6747 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6748 {
6749         struct sctp_association *asoc;
6750         struct sctp_tmit_chunk *chk, *nchk;
6751         struct sctp_asconf_chunk *acp;
6752
6753         asoc = &stcb->asoc;
6754         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6755                 /* find SCTP_ASCONF chunk in queue */
6756                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6757                         if (chk->data) {
6758                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6759                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6760                                         /* Not Acked yet */
6761                                         break;
6762                                 }
6763                         }
6764                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6765                         if (chk->data) {
6766                                 sctp_m_freem(chk->data);
6767                                 chk->data = NULL;
6768                         }
6769                         asoc->ctrl_queue_cnt--;
6770                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6771                 }
6772         }
6773 }
6774
6775
6776 static void
6777 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6778     struct sctp_association *asoc,
6779     struct sctp_tmit_chunk **data_list,
6780     int bundle_at,
6781     struct sctp_nets *net)
6782 {
6783         int i;
6784         struct sctp_tmit_chunk *tp1;
6785
6786         for (i = 0; i < bundle_at; i++) {
6787                 /* off of the send queue */
6788                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6789                 asoc->send_queue_cnt--;
6790                 if (i > 0) {
6791                         /*
6792                          * Any chunk NOT 0 you zap the time chunk 0 gets
6793                          * zapped or set based on if a RTO measurment is
6794                          * needed.
6795                          */
6796                         data_list[i]->do_rtt = 0;
6797                 }
6798                 /* record time */
6799                 data_list[i]->sent_rcv_time = net->last_sent_time;
6800                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6801                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6802                 if (data_list[i]->whoTo == NULL) {
6803                         data_list[i]->whoTo = net;
6804                         atomic_add_int(&net->ref_count, 1);
6805                 }
6806                 /* on to the sent queue */
6807                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6808                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6809                         struct sctp_tmit_chunk *tpp;
6810
6811                         /* need to move back */
6812         back_up_more:
6813                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6814                         if (tpp == NULL) {
6815                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6816                                 goto all_done;
6817                         }
6818                         tp1 = tpp;
6819                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6820                                 goto back_up_more;
6821                         }
6822                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6823                 } else {
6824                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6825                             data_list[i],
6826                             sctp_next);
6827                 }
6828 all_done:
6829                 /* This does not lower until the cum-ack passes it */
6830                 asoc->sent_queue_cnt++;
6831                 if ((asoc->peers_rwnd <= 0) &&
6832                     (asoc->total_flight == 0) &&
6833                     (bundle_at == 1)) {
6834                         /* Mark the chunk as being a window probe */
6835                         SCTP_STAT_INCR(sctps_windowprobed);
6836                 }
6837 #ifdef SCTP_AUDITING_ENABLED
6838                 sctp_audit_log(0xC2, 3);
6839 #endif
6840                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6841                 data_list[i]->snd_count = 1;
6842                 data_list[i]->rec.data.chunk_was_revoked = 0;
6843                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6844                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6845                             data_list[i]->whoTo->flight_size,
6846                             data_list[i]->book_size,
6847                             (uintptr_t) data_list[i]->whoTo,
6848                             data_list[i]->rec.data.TSN_seq);
6849                 }
6850                 sctp_flight_size_increase(data_list[i]);
6851                 sctp_total_flight_increase(stcb, data_list[i]);
6852                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6853                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6854                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6855                 }
6856                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6857                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6858                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6859                         /* SWS sender side engages */
6860                         asoc->peers_rwnd = 0;
6861                 }
6862         }
6863         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6864                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6865         }
6866 }
6867
6868 static void
6869 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6870 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6871     SCTP_UNUSED
6872 #endif
6873 )
6874 {
6875         struct sctp_tmit_chunk *chk, *nchk;
6876
6877         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6878                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6879                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6880                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6881                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6882                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6883                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6884                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6885                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6886                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6887                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6888                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6889                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6890                         /* Stray chunks must be cleaned up */
6891         clean_up_anyway:
6892                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6893                         if (chk->data) {
6894                                 sctp_m_freem(chk->data);
6895                                 chk->data = NULL;
6896                         }
6897                         asoc->ctrl_queue_cnt--;
6898                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6899                                 asoc->fwd_tsn_cnt--;
6900                         sctp_free_a_chunk(stcb, chk, so_locked);
6901                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6902                         /* special handling, we must look into the param */
6903                         if (chk != asoc->str_reset) {
6904                                 goto clean_up_anyway;
6905                         }
6906                 }
6907         }
6908 }
6909
6910
6911 static int
6912 sctp_can_we_split_this(struct sctp_tcb *stcb,
6913     uint32_t length,
6914     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6915 {
6916         /*
6917          * Make a decision on if I should split a msg into multiple parts.
6918          * This is only asked of incomplete messages.
6919          */
6920         if (eeor_on) {
6921                 /*
6922                  * If we are doing EEOR we need to always send it if its the
6923                  * entire thing, since it might be all the guy is putting in
6924                  * the hopper.
6925                  */
6926                 if (goal_mtu >= length) {
6927                         /*-
6928                          * If we have data outstanding,
6929                          * we get another chance when the sack
6930                          * arrives to transmit - wait for more data
6931                          */
6932                         if (stcb->asoc.total_flight == 0) {
6933                                 /*
6934                                  * If nothing is in flight, we zero the
6935                                  * packet counter.
6936                                  */
6937                                 return (length);
6938                         }
6939                         return (0);
6940
6941                 } else {
6942                         /* You can fill the rest */
6943                         return (goal_mtu);
6944                 }
6945         }
6946         /*-
6947          * For those strange folk that make the send buffer
6948          * smaller than our fragmentation point, we can't
6949          * get a full msg in so we have to allow splitting.
6950          */
6951         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6952                 return (length);
6953         }
6954         if ((length <= goal_mtu) ||
6955             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6956                 /* Sub-optimial residual don't split in non-eeor mode. */
6957                 return (0);
6958         }
6959         /*
6960          * If we reach here length is larger than the goal_mtu. Do we wish
6961          * to split it for the sake of packet putting together?
6962          */
6963         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6964                 /* Its ok to split it */
6965                 return (min(goal_mtu, frag_point));
6966         }
6967         /* Nope, can't split */
6968         return (0);
6969
6970 }
6971
6972 static uint32_t
6973 sctp_move_to_outqueue(struct sctp_tcb *stcb,
6974     struct sctp_stream_out *strq,
6975     uint32_t goal_mtu,
6976     uint32_t frag_point,
6977     int *locked,
6978     int *giveup,
6979     int eeor_mode,
6980     int *bail,
6981     int so_locked
6982 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6983     SCTP_UNUSED
6984 #endif
6985 )
6986 {
6987         /* Move from the stream to the send_queue keeping track of the total */
6988         struct sctp_association *asoc;
6989         struct sctp_stream_queue_pending *sp;
6990         struct sctp_tmit_chunk *chk;
6991         struct sctp_data_chunk *dchkh;
6992         uint32_t to_move, length;
6993         uint8_t rcv_flags = 0;
6994         uint8_t some_taken;
6995         uint8_t send_lock_up = 0;
6996
6997         SCTP_TCB_LOCK_ASSERT(stcb);
6998         asoc = &stcb->asoc;
6999 one_more_time:
7000         /* sa_ignore FREED_MEMORY */
7001         sp = TAILQ_FIRST(&strq->outqueue);
7002         if (sp == NULL) {
7003                 *locked = 0;
7004                 if (send_lock_up == 0) {
7005                         SCTP_TCB_SEND_LOCK(stcb);
7006                         send_lock_up = 1;
7007                 }
7008                 sp = TAILQ_FIRST(&strq->outqueue);
7009                 if (sp) {
7010                         goto one_more_time;
7011                 }
7012                 if (strq->last_msg_incomplete) {
7013                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7014                             strq->stream_no,
7015                             strq->last_msg_incomplete);
7016                         strq->last_msg_incomplete = 0;
7017                 }
7018                 to_move = 0;
7019                 if (send_lock_up) {
7020                         SCTP_TCB_SEND_UNLOCK(stcb);
7021                         send_lock_up = 0;
7022                 }
7023                 goto out_of;
7024         }
7025         if ((sp->msg_is_complete) && (sp->length == 0)) {
7026                 if (sp->sender_all_done) {
7027                         /*
7028                          * We are doing differed cleanup. Last time through
7029                          * when we took all the data the sender_all_done was
7030                          * not set.
7031                          */
7032                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7033                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7034                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7035                                     sp->sender_all_done,
7036                                     sp->length,
7037                                     sp->msg_is_complete,
7038                                     sp->put_last_out,
7039                                     send_lock_up);
7040                         }
7041                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7042                                 SCTP_TCB_SEND_LOCK(stcb);
7043                                 send_lock_up = 1;
7044                         }
7045                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7046                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7047                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7048                         if (sp->net) {
7049                                 sctp_free_remote_addr(sp->net);
7050                                 sp->net = NULL;
7051                         }
7052                         if (sp->data) {
7053                                 sctp_m_freem(sp->data);
7054                                 sp->data = NULL;
7055                         }
7056                         sctp_free_a_strmoq(stcb, sp, so_locked);
7057                         /* we can't be locked to it */
7058                         *locked = 0;
7059                         stcb->asoc.locked_on_sending = NULL;
7060                         if (send_lock_up) {
7061                                 SCTP_TCB_SEND_UNLOCK(stcb);
7062                                 send_lock_up = 0;
7063                         }
7064                         /* back to get the next msg */
7065                         goto one_more_time;
7066                 } else {
7067                         /*
7068                          * sender just finished this but still holds a
7069                          * reference
7070                          */
7071                         *locked = 1;
7072                         *giveup = 1;
7073                         to_move = 0;
7074                         goto out_of;
7075                 }
7076         } else {
7077                 /* is there some to get */
7078                 if (sp->length == 0) {
7079                         /* no */
7080                         *locked = 1;
7081                         *giveup = 1;
7082                         to_move = 0;
7083                         goto out_of;
7084                 } else if (sp->discard_rest) {
7085                         if (send_lock_up == 0) {
7086                                 SCTP_TCB_SEND_LOCK(stcb);
7087                                 send_lock_up = 1;
7088                         }
7089                         /* Whack down the size */
7090                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7091                         if ((stcb->sctp_socket != NULL) && \
7092                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7093                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7094                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7095                         }
7096                         if (sp->data) {
7097                                 sctp_m_freem(sp->data);
7098                                 sp->data = NULL;
7099                                 sp->tail_mbuf = NULL;
7100                         }
7101                         sp->length = 0;
7102                         sp->some_taken = 1;
7103                         *locked = 1;
7104                         *giveup = 1;
7105                         to_move = 0;
7106                         goto out_of;
7107                 }
7108         }
7109         some_taken = sp->some_taken;
7110         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7111                 sp->msg_is_complete = 1;
7112         }
7113 re_look:
7114         length = sp->length;
7115         if (sp->msg_is_complete) {
7116                 /* The message is complete */
7117                 to_move = min(length, frag_point);
7118                 if (to_move == length) {
7119                         /* All of it fits in the MTU */
7120                         if (sp->some_taken) {
7121                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7122                                 sp->put_last_out = 1;
7123                         } else {
7124                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7125                                 sp->put_last_out = 1;
7126                         }
7127                 } else {
7128                         /* Not all of it fits, we fragment */
7129                         if (sp->some_taken == 0) {
7130                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7131                         }
7132                         sp->some_taken = 1;
7133                 }
7134         } else {
7135                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7136                 if (to_move) {
7137                         /*-
7138                          * We use a snapshot of length in case it
7139                          * is expanding during the compare.
7140                          */
7141                         uint32_t llen;
7142
7143                         llen = length;
7144                         if (to_move >= llen) {
7145                                 to_move = llen;
7146                                 if (send_lock_up == 0) {
7147                                         /*-
7148                                          * We are taking all of an incomplete msg
7149                                          * thus we need a send lock.
7150                                          */
7151                                         SCTP_TCB_SEND_LOCK(stcb);
7152                                         send_lock_up = 1;
7153                                         if (sp->msg_is_complete) {
7154                                                 /*
7155                                                  * the sender finished the
7156                                                  * msg
7157                                                  */
7158                                                 goto re_look;
7159                                         }
7160                                 }
7161                         }
7162                         if (sp->some_taken == 0) {
7163                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7164                                 sp->some_taken = 1;
7165                         }
7166                 } else {
7167                         /* Nothing to take. */
7168                         if (sp->some_taken) {
7169                                 *locked = 1;
7170                         }
7171                         *giveup = 1;
7172                         to_move = 0;
7173                         goto out_of;
7174                 }
7175         }
7176
7177         /* If we reach here, we can copy out a chunk */
7178         sctp_alloc_a_chunk(stcb, chk);
7179         if (chk == NULL) {
7180                 /* No chunk memory */
7181                 *giveup = 1;
7182                 to_move = 0;
7183                 goto out_of;
7184         }
7185         /*
7186          * Setup for unordered if needed by looking at the user sent info
7187          * flags.
7188          */
7189         if (sp->sinfo_flags & SCTP_UNORDERED) {
7190                 rcv_flags |= SCTP_DATA_UNORDERED;
7191         }
7192         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7193             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7194                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7195         }
7196         /* clear out the chunk before setting up */
7197         memset(chk, 0, sizeof(*chk));
7198         chk->rec.data.rcv_flags = rcv_flags;
7199
7200         if (to_move >= length) {
7201                 /* we think we can steal the whole thing */
7202                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7203                         SCTP_TCB_SEND_LOCK(stcb);
7204                         send_lock_up = 1;
7205                 }
7206                 if (to_move < sp->length) {
7207                         /* bail, it changed */
7208                         goto dont_do_it;
7209                 }
7210                 chk->data = sp->data;
7211                 chk->last_mbuf = sp->tail_mbuf;
7212                 /* register the stealing */
7213                 sp->data = sp->tail_mbuf = NULL;
7214         } else {
7215                 struct mbuf *m;
7216
7217 dont_do_it:
7218                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7219                 chk->last_mbuf = NULL;
7220                 if (chk->data == NULL) {
7221                         sp->some_taken = some_taken;
7222                         sctp_free_a_chunk(stcb, chk, so_locked);
7223                         *bail = 1;
7224                         to_move = 0;
7225                         goto out_of;
7226                 }
7227 #ifdef SCTP_MBUF_LOGGING
7228                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7229                         struct mbuf *mat;
7230
7231                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7232                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7233                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7234                                 }
7235                         }
7236                 }
7237 #endif
7238                 /* Pull off the data */
7239                 m_adj(sp->data, to_move);
7240                 /* Now lets work our way down and compact it */
7241                 m = sp->data;
7242                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7243                         sp->data = SCTP_BUF_NEXT(m);
7244                         SCTP_BUF_NEXT(m) = NULL;
7245                         if (sp->tail_mbuf == m) {
7246                                 /*-
7247                                  * Freeing tail? TSNH since
7248                                  * we supposedly were taking less
7249                                  * than the sp->length.
7250                                  */
7251 #ifdef INVARIANTS
7252                                 panic("Huh, freing tail? - TSNH");
7253 #else
7254                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7255                                 sp->tail_mbuf = sp->data = NULL;
7256                                 sp->length = 0;
7257 #endif
7258
7259                         }
7260                         sctp_m_free(m);
7261                         m = sp->data;
7262                 }
7263         }
7264         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7265                 chk->copy_by_ref = 1;
7266         } else {
7267                 chk->copy_by_ref = 0;
7268         }
7269         /*
7270          * get last_mbuf and counts of mb useage This is ugly but hopefully
7271          * its only one mbuf.
7272          */
7273         if (chk->last_mbuf == NULL) {
7274                 chk->last_mbuf = chk->data;
7275                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7276                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7277                 }
7278         }
7279         if (to_move > length) {
7280                 /*- This should not happen either
7281                  * since we always lower to_move to the size
7282                  * of sp->length if its larger.
7283                  */
7284 #ifdef INVARIANTS
7285                 panic("Huh, how can to_move be larger?");
7286 #else
7287                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7288                 sp->length = 0;
7289 #endif
7290         } else {
7291                 atomic_subtract_int(&sp->length, to_move);
7292         }
7293         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7294                 /* Not enough room for a chunk header, get some */
7295                 struct mbuf *m;
7296
7297                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7298                 if (m == NULL) {
7299                         /*
7300                          * we're in trouble here. _PREPEND below will free
7301                          * all the data if there is no leading space, so we
7302                          * must put the data back and restore.
7303                          */
7304                         if (send_lock_up == 0) {
7305                                 SCTP_TCB_SEND_LOCK(stcb);
7306                                 send_lock_up = 1;
7307                         }
7308                         if (chk->data == NULL) {
7309                                 /* unsteal the data */
7310                                 sp->data = chk->data;
7311                                 sp->tail_mbuf = chk->last_mbuf;
7312                         } else {
7313                                 struct mbuf *m_tmp;
7314
7315                                 /* reassemble the data */
7316                                 m_tmp = sp->data;
7317                                 sp->data = chk->data;
7318                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7319                         }
7320                         sp->some_taken = some_taken;
7321                         atomic_add_int(&sp->length, to_move);
7322                         chk->data = NULL;
7323                         *bail = 1;
7324                         sctp_free_a_chunk(stcb, chk, so_locked);
7325                         to_move = 0;
7326                         goto out_of;
7327                 } else {
7328                         SCTP_BUF_LEN(m) = 0;
7329                         SCTP_BUF_NEXT(m) = chk->data;
7330                         chk->data = m;
7331                         M_ALIGN(chk->data, 4);
7332                 }
7333         }
7334         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7335         if (chk->data == NULL) {
7336                 /* HELP, TSNH since we assured it would not above? */
7337 #ifdef INVARIANTS
7338                 panic("prepend failes HELP?");
7339 #else
7340                 SCTP_PRINTF("prepend fails HELP?\n");
7341                 sctp_free_a_chunk(stcb, chk, so_locked);
7342 #endif
7343                 *bail = 1;
7344                 to_move = 0;
7345                 goto out_of;
7346         }
7347         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7348         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7349         chk->book_size_scale = 0;
7350         chk->sent = SCTP_DATAGRAM_UNSENT;
7351
7352         chk->flags = 0;
7353         chk->asoc = &stcb->asoc;
7354         chk->pad_inplace = 0;
7355         chk->no_fr_allowed = 0;
7356         chk->rec.data.stream_seq = strq->next_sequence_send;
7357         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7358                 strq->next_sequence_send++;
7359         }
7360         chk->rec.data.stream_number = sp->stream;
7361         chk->rec.data.payloadtype = sp->ppid;
7362         chk->rec.data.context = sp->context;
7363         chk->rec.data.doing_fast_retransmit = 0;
7364
7365         chk->rec.data.timetodrop = sp->ts;
7366         chk->flags = sp->act_flags;
7367
7368         if (sp->net) {
7369                 chk->whoTo = sp->net;
7370                 atomic_add_int(&chk->whoTo->ref_count, 1);
7371         } else
7372                 chk->whoTo = NULL;
7373
7374         if (sp->holds_key_ref) {
7375                 chk->auth_keyid = sp->auth_keyid;
7376                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7377                 chk->holds_key_ref = 1;
7378         }
7379         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7380         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7381                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7382                     (uintptr_t) stcb, sp->length,
7383                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7384                     chk->rec.data.TSN_seq);
7385         }
7386         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7387         /*
7388          * Put the rest of the things in place now. Size was done earlier in
7389          * previous loop prior to padding.
7390          */
7391
7392 #ifdef SCTP_ASOCLOG_OF_TSNS
7393         SCTP_TCB_LOCK_ASSERT(stcb);
7394         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7395                 asoc->tsn_out_at = 0;
7396                 asoc->tsn_out_wrapped = 1;
7397         }
7398         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7399         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7400         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7401         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7402         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7403         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7404         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7405         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7406         asoc->tsn_out_at++;
7407 #endif
7408
7409         dchkh->ch.chunk_type = SCTP_DATA;
7410         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7411         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7412         dchkh->dp.stream_id = htons(strq->stream_no);
7413         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7414         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7415         dchkh->ch.chunk_length = htons(chk->send_size);
7416         /* Now advance the chk->send_size by the actual pad needed. */
7417         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7418                 /* need a pad */
7419                 struct mbuf *lm;
7420                 int pads;
7421
7422                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7423                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7424                         chk->pad_inplace = 1;
7425                 }
7426                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7427                         /* pad added an mbuf */
7428                         chk->last_mbuf = lm;
7429                 }
7430                 chk->send_size += pads;
7431         }
7432         /* We only re-set the policy if it is on */
7433         if (sp->pr_sctp_on) {
7434                 sctp_set_prsctp_policy(sp);
7435                 asoc->pr_sctp_cnt++;
7436                 chk->pr_sctp_on = 1;
7437         } else {
7438                 chk->pr_sctp_on = 0;
7439         }
7440         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7441                 /* All done pull and kill the message */
7442                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7443                 if (sp->put_last_out == 0) {
7444                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7445                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7446                             sp->sender_all_done,
7447                             sp->length,
7448                             sp->msg_is_complete,
7449                             sp->put_last_out,
7450                             send_lock_up);
7451                 }
7452                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7453                         SCTP_TCB_SEND_LOCK(stcb);
7454                         send_lock_up = 1;
7455                 }
7456                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7457                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7458                 if (sp->net) {
7459                         sctp_free_remote_addr(sp->net);
7460                         sp->net = NULL;
7461                 }
7462                 if (sp->data) {
7463                         sctp_m_freem(sp->data);
7464                         sp->data = NULL;
7465                 }
7466                 sctp_free_a_strmoq(stcb, sp, so_locked);
7467
7468                 /* we can't be locked to it */
7469                 *locked = 0;
7470                 stcb->asoc.locked_on_sending = NULL;
7471         } else {
7472                 /* more to go, we are locked */
7473                 *locked = 1;
7474         }
7475         asoc->chunks_on_out_queue++;
7476         strq->chunks_on_queues++;
7477         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7478         asoc->send_queue_cnt++;
7479 out_of:
7480         if (send_lock_up) {
7481                 SCTP_TCB_SEND_UNLOCK(stcb);
7482         }
7483         return (to_move);
7484 }
7485
7486
7487 static void
7488 sctp_fill_outqueue(struct sctp_tcb *stcb,
7489     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7490 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7491     SCTP_UNUSED
7492 #endif
7493 )
7494 {
7495         struct sctp_association *asoc;
7496         struct sctp_stream_out *strq;
7497         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7498         int locked, giveup;
7499
7500         SCTP_TCB_LOCK_ASSERT(stcb);
7501         asoc = &stcb->asoc;
7502         switch (net->ro._l_addr.sa.sa_family) {
7503 #ifdef INET
7504         case AF_INET:
7505                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7506                 break;
7507 #endif
7508 #ifdef INET6
7509         case AF_INET6:
7510                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7511                 break;
7512 #endif
7513         default:
7514                 /* TSNH */
7515                 goal_mtu = net->mtu;
7516                 break;
7517         }
7518         /* Need an allowance for the data chunk header too */
7519         goal_mtu -= sizeof(struct sctp_data_chunk);
7520
7521         /* must make even word boundary */
7522         goal_mtu &= 0xfffffffc;
7523         if (asoc->locked_on_sending) {
7524                 /* We are stuck on one stream until the message completes. */
7525                 strq = asoc->locked_on_sending;
7526                 locked = 1;
7527         } else {
7528                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7529                 locked = 0;
7530         }
7531         while ((goal_mtu > 0) && strq) {
7532                 giveup = 0;
7533                 bail = 0;
7534                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7535                     &giveup, eeor_mode, &bail, so_locked);
7536                 if (moved_how_much)
7537                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7538
7539                 if (locked) {
7540                         asoc->locked_on_sending = strq;
7541                         if ((moved_how_much == 0) || (giveup) || bail)
7542                                 /* no more to move for now */
7543                                 break;
7544                 } else {
7545                         asoc->locked_on_sending = NULL;
7546                         if ((giveup) || bail) {
7547                                 break;
7548                         }
7549                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7550                         if (strq == NULL) {
7551                                 break;
7552                         }
7553                 }
7554                 total_moved += moved_how_much;
7555                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7556                 goal_mtu &= 0xfffffffc;
7557         }
7558         if (bail)
7559                 *quit_now = 1;
7560
7561         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7562
7563         if (total_moved == 0) {
7564                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7565                     (net == stcb->asoc.primary_destination)) {
7566                         /* ran dry for primary network net */
7567                         SCTP_STAT_INCR(sctps_primary_randry);
7568                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7569                         /* ran dry with CMT on */
7570                         SCTP_STAT_INCR(sctps_cmt_randry);
7571                 }
7572         }
7573 }
7574
7575 void
7576 sctp_fix_ecn_echo(struct sctp_association *asoc)
7577 {
7578         struct sctp_tmit_chunk *chk;
7579
7580         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7581                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7582                         chk->sent = SCTP_DATAGRAM_UNSENT;
7583                 }
7584         }
7585 }
7586
7587 void
7588 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7589 {
7590         struct sctp_association *asoc;
7591         struct sctp_tmit_chunk *chk;
7592         struct sctp_stream_queue_pending *sp;
7593         unsigned int i;
7594
7595         if (net == NULL) {
7596                 return;
7597         }
7598         asoc = &stcb->asoc;
7599         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7600                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7601                         if (sp->net == net) {
7602                                 sctp_free_remote_addr(sp->net);
7603                                 sp->net = NULL;
7604                         }
7605                 }
7606         }
7607         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7608                 if (chk->whoTo == net) {
7609                         sctp_free_remote_addr(chk->whoTo);
7610                         chk->whoTo = NULL;
7611                 }
7612         }
7613 }
7614
7615 int
7616 sctp_med_chunk_output(struct sctp_inpcb *inp,
7617     struct sctp_tcb *stcb,
7618     struct sctp_association *asoc,
7619     int *num_out,
7620     int *reason_code,
7621     int control_only, int from_where,
7622     struct timeval *now, int *now_filled, int frag_point, int so_locked
7623 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7624     SCTP_UNUSED
7625 #endif
7626 )
7627 {
7628         /*
7629          * Ok this is the generic chunk service queue. we must do the
7630          * following: - Service the stream queue that is next, moving any
7631          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7632          * LAST to the out queue in one pass) and assigning TSN's - Check to
7633          * see if the cwnd/rwnd allows any output, if so we go ahead and
7634          * fomulate and send the low level chunks. Making sure to combine
7635          * any control in the control chunk queue also.
7636          */
7637         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7638         struct mbuf *outchain, *endoutchain;
7639         struct sctp_tmit_chunk *chk, *nchk;
7640
7641         /* temp arrays for unlinking */
7642         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7643         int no_fragmentflg, error;
7644         unsigned int max_rwnd_per_dest, max_send_per_dest;
7645         int one_chunk, hbflag, skip_data_for_this_net;
7646         int asconf, cookie, no_out_cnt;
7647         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7648         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7649         int tsns_sent = 0;
7650         uint32_t auth_offset = 0;
7651         struct sctp_auth_chunk *auth = NULL;
7652         uint16_t auth_keyid;
7653         int override_ok = 1;
7654         int skip_fill_up = 0;
7655         int data_auth_reqd = 0;
7656
7657         /*
7658          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7659          * destination.
7660          */
7661         int quit_now = 0;
7662
7663         *num_out = 0;
7664         auth_keyid = stcb->asoc.authinfo.active_keyid;
7665
7666         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7667             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7668             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7669                 eeor_mode = 1;
7670         } else {
7671                 eeor_mode = 0;
7672         }
7673         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7674         /*
7675          * First lets prime the pump. For each destination, if there is room
7676          * in the flight size, attempt to pull an MTU's worth out of the
7677          * stream queues into the general send_queue
7678          */
7679 #ifdef SCTP_AUDITING_ENABLED
7680         sctp_audit_log(0xC2, 2);
7681 #endif
7682         SCTP_TCB_LOCK_ASSERT(stcb);
7683         hbflag = 0;
7684         if ((control_only) || (asoc->stream_reset_outstanding))
7685                 no_data_chunks = 1;
7686         else
7687                 no_data_chunks = 0;
7688
7689         /* Nothing to possible to send? */
7690         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7691             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7692             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7693             TAILQ_EMPTY(&asoc->send_queue) &&
7694             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7695 nothing_to_send:
7696                 *reason_code = 9;
7697                 return (0);
7698         }
7699         if (asoc->peers_rwnd == 0) {
7700                 /* No room in peers rwnd */
7701                 *reason_code = 1;
7702                 if (asoc->total_flight > 0) {
7703                         /* we are allowed one chunk in flight */
7704                         no_data_chunks = 1;
7705                 }
7706         }
7707         if (stcb->asoc.ecn_echo_cnt_onq) {
7708                 /* Record where a sack goes, if any */
7709                 if (no_data_chunks &&
7710                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7711                         /* Nothing but ECNe to send - we don't do that */
7712                         goto nothing_to_send;
7713                 }
7714                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7715                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7716                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7717                                 sack_goes_to = chk->whoTo;
7718                                 break;
7719                         }
7720                 }
7721         }
7722         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7723         if (stcb->sctp_socket)
7724                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7725         else
7726                 max_send_per_dest = 0;
7727         if (no_data_chunks == 0) {
7728                 /* How many non-directed chunks are there? */
7729                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7730                         if (chk->whoTo == NULL) {
7731                                 /*
7732                                  * We already have non-directed chunks on
7733                                  * the queue, no need to do a fill-up.
7734                                  */
7735                                 skip_fill_up = 1;
7736                                 break;
7737                         }
7738                 }
7739
7740         }
7741         if ((no_data_chunks == 0) &&
7742             (skip_fill_up == 0) &&
7743             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7744                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7745                         /*
7746                          * This for loop we are in takes in each net, if
7747                          * its's got space in cwnd and has data sent to it
7748                          * (when CMT is off) then it calls
7749                          * sctp_fill_outqueue for the net. This gets data on
7750                          * the send queue for that network.
7751                          *
7752                          * In sctp_fill_outqueue TSN's are assigned and data is
7753                          * copied out of the stream buffers. Note mostly
7754                          * copy by reference (we hope).
7755                          */
7756                         net->window_probe = 0;
7757                         if ((net != stcb->asoc.alternate) &&
7758                             ((net->dest_state & SCTP_ADDR_PF) ||
7759                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7760                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7761                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7762                                         sctp_log_cwnd(stcb, net, 1,
7763                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7764                                 }
7765                                 continue;
7766                         }
7767                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7768                             (net->flight_size == 0)) {
7769                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7770                         }
7771                         if (net->flight_size >= net->cwnd) {
7772                                 /* skip this network, no room - can't fill */
7773                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7774                                         sctp_log_cwnd(stcb, net, 3,
7775                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7776                                 }
7777                                 continue;
7778                         }
7779                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7780                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7781                         }
7782                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7783                         if (quit_now) {
7784                                 /* memory alloc failure */
7785                                 no_data_chunks = 1;
7786                                 break;
7787                         }
7788                 }
7789         }
7790         /* now service each destination and send out what we can for it */
7791         /* Nothing to send? */
7792         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7793             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7794             TAILQ_EMPTY(&asoc->send_queue)) {
7795                 *reason_code = 8;
7796                 return (0);
7797         }
7798         if (asoc->sctp_cmt_on_off > 0) {
7799                 /* get the last start point */
7800                 start_at = asoc->last_net_cmt_send_started;
7801                 if (start_at == NULL) {
7802                         /* null so to beginning */
7803                         start_at = TAILQ_FIRST(&asoc->nets);
7804                 } else {
7805                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7806                         if (start_at == NULL) {
7807                                 start_at = TAILQ_FIRST(&asoc->nets);
7808                         }
7809                 }
7810                 asoc->last_net_cmt_send_started = start_at;
7811         } else {
7812                 start_at = TAILQ_FIRST(&asoc->nets);
7813         }
7814         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7815                 if (chk->whoTo == NULL) {
7816                         if (asoc->alternate) {
7817                                 chk->whoTo = asoc->alternate;
7818                         } else {
7819                                 chk->whoTo = asoc->primary_destination;
7820                         }
7821                         atomic_add_int(&chk->whoTo->ref_count, 1);
7822                 }
7823         }
7824         old_start_at = NULL;
7825 again_one_more_time:
7826         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7827                 /* how much can we send? */
7828                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7829                 if (old_start_at && (old_start_at == net)) {
7830                         /* through list ocmpletely. */
7831                         break;
7832                 }
7833                 tsns_sent = 0xa;
7834                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7835                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7836                     (net->flight_size >= net->cwnd)) {
7837                         /*
7838                          * Nothing on control or asconf and flight is full,
7839                          * we can skip even in the CMT case.
7840                          */
7841                         continue;
7842                 }
7843                 bundle_at = 0;
7844                 endoutchain = outchain = NULL;
7845                 no_fragmentflg = 1;
7846                 one_chunk = 0;
7847                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7848                         skip_data_for_this_net = 1;
7849                 } else {
7850                         skip_data_for_this_net = 0;
7851                 }
7852                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7853                         /*
7854                          * if we have a route and an ifp check to see if we
7855                          * have room to send to this guy
7856                          */
7857                         struct ifnet *ifp;
7858
7859                         ifp = net->ro.ro_rt->rt_ifp;
7860                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7861                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7862                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7863                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7864                                 }
7865                                 continue;
7866                         }
7867                 }
7868                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7869 #ifdef INET
7870                 case AF_INET:
7871                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7872                         break;
7873 #endif
7874 #ifdef INET6
7875                 case AF_INET6:
7876                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7877                         break;
7878 #endif
7879                 default:
7880                         /* TSNH */
7881                         mtu = net->mtu;
7882                         break;
7883                 }
7884                 mx_mtu = mtu;
7885                 to_out = 0;
7886                 if (mtu > asoc->peers_rwnd) {
7887                         if (asoc->total_flight > 0) {
7888                                 /* We have a packet in flight somewhere */
7889                                 r_mtu = asoc->peers_rwnd;
7890                         } else {
7891                                 /* We are always allowed to send one MTU out */
7892                                 one_chunk = 1;
7893                                 r_mtu = mtu;
7894                         }
7895                 } else {
7896                         r_mtu = mtu;
7897                 }
7898                 /************************/
7899                 /* ASCONF transmission */
7900                 /************************/
7901                 /* Now first lets go through the asconf queue */
7902                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7903                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7904                                 continue;
7905                         }
7906                         if (chk->whoTo == NULL) {
7907                                 if (asoc->alternate == NULL) {
7908                                         if (asoc->primary_destination != net) {
7909                                                 break;
7910                                         }
7911                                 } else {
7912                                         if (asoc->alternate != net) {
7913                                                 break;
7914                                         }
7915                                 }
7916                         } else {
7917                                 if (chk->whoTo != net) {
7918                                         break;
7919                                 }
7920                         }
7921                         if (chk->data == NULL) {
7922                                 break;
7923                         }
7924                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7925                             chk->sent != SCTP_DATAGRAM_RESEND) {
7926                                 break;
7927                         }
7928                         /*
7929                          * if no AUTH is yet included and this chunk
7930                          * requires it, make sure to account for it.  We
7931                          * don't apply the size until the AUTH chunk is
7932                          * actually added below in case there is no room for
7933                          * this chunk. NOTE: we overload the use of "omtu"
7934                          * here
7935                          */
7936                         if ((auth == NULL) &&
7937                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7938                             stcb->asoc.peer_auth_chunks)) {
7939                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7940                         } else
7941                                 omtu = 0;
7942                         /* Here we do NOT factor the r_mtu */
7943                         if ((chk->send_size < (int)(mtu - omtu)) ||
7944                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7945                                 /*
7946                                  * We probably should glom the mbuf chain
7947                                  * from the chk->data for control but the
7948                                  * problem is it becomes yet one more level
7949                                  * of tracking to do if for some reason
7950                                  * output fails. Then I have got to
7951                                  * reconstruct the merged control chain.. el
7952                                  * yucko.. for now we take the easy way and
7953                                  * do the copy
7954                                  */
7955                                 /*
7956                                  * Add an AUTH chunk, if chunk requires it
7957                                  * save the offset into the chain for AUTH
7958                                  */
7959                                 if ((auth == NULL) &&
7960                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7961                                     stcb->asoc.peer_auth_chunks))) {
7962                                         outchain = sctp_add_auth_chunk(outchain,
7963                                             &endoutchain,
7964                                             &auth,
7965                                             &auth_offset,
7966                                             stcb,
7967                                             chk->rec.chunk_id.id);
7968                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7969                                 }
7970                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7971                                     (int)chk->rec.chunk_id.can_take_data,
7972                                     chk->send_size, chk->copy_by_ref);
7973                                 if (outchain == NULL) {
7974                                         *reason_code = 8;
7975                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7976                                         return (ENOMEM);
7977                                 }
7978                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7979                                 /* update our MTU size */
7980                                 if (mtu > (chk->send_size + omtu))
7981                                         mtu -= (chk->send_size + omtu);
7982                                 else
7983                                         mtu = 0;
7984                                 to_out += (chk->send_size + omtu);
7985                                 /* Do clear IP_DF ? */
7986                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
7987                                         no_fragmentflg = 0;
7988                                 }
7989                                 if (chk->rec.chunk_id.can_take_data)
7990                                         chk->data = NULL;
7991                                 /*
7992                                  * set hb flag since we can use these for
7993                                  * RTO
7994                                  */
7995                                 hbflag = 1;
7996                                 asconf = 1;
7997                                 /*
7998                                  * should sysctl this: don't bundle data
7999                                  * with ASCONF since it requires AUTH
8000                                  */
8001                                 no_data_chunks = 1;
8002                                 chk->sent = SCTP_DATAGRAM_SENT;
8003                                 if (chk->whoTo == NULL) {
8004                                         chk->whoTo = net;
8005                                         atomic_add_int(&net->ref_count, 1);
8006                                 }
8007                                 chk->snd_count++;
8008                                 if (mtu == 0) {
8009                                         /*
8010                                          * Ok we are out of room but we can
8011                                          * output without effecting the
8012                                          * flight size since this little guy
8013                                          * is a control only packet.
8014                                          */
8015                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8016                                         /*
8017                                          * do NOT clear the asconf flag as
8018                                          * it is used to do appropriate
8019                                          * source address selection.
8020                                          */
8021                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8022                                             (struct sockaddr *)&net->ro._l_addr,
8023                                             outchain, auth_offset, auth,
8024                                             stcb->asoc.authinfo.active_keyid,
8025                                             no_fragmentflg, 0, asconf,
8026                                             inp->sctp_lport, stcb->rport,
8027                                             htonl(stcb->asoc.peer_vtag),
8028                                             net->port, NULL,
8029                                             0, 0,
8030                                             so_locked))) {
8031                                                 if (error == ENOBUFS) {
8032                                                         asoc->ifp_had_enobuf = 1;
8033                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8034                                                 }
8035                                                 if (from_where == 0) {
8036                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8037                                                 }
8038                                                 if (*now_filled == 0) {
8039                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8040                                                         *now_filled = 1;
8041                                                         *now = net->last_sent_time;
8042                                                 } else {
8043                                                         net->last_sent_time = *now;
8044                                                 }
8045                                                 hbflag = 0;
8046                                                 /* error, could not output */
8047                                                 if (error == EHOSTUNREACH) {
8048                                                         /*
8049                                                          * Destination went
8050                                                          * unreachable
8051                                                          * during this send
8052                                                          */
8053                                                         sctp_move_chunks_from_net(stcb, net);
8054                                                 }
8055                                                 *reason_code = 7;
8056                                                 continue;
8057                                         } else
8058                                                 asoc->ifp_had_enobuf = 0;
8059                                         if (*now_filled == 0) {
8060                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8061                                                 *now_filled = 1;
8062                                                 *now = net->last_sent_time;
8063                                         } else {
8064                                                 net->last_sent_time = *now;
8065                                         }
8066                                         hbflag = 0;
8067                                         /*
8068                                          * increase the number we sent, if a
8069                                          * cookie is sent we don't tell them
8070                                          * any was sent out.
8071                                          */
8072                                         outchain = endoutchain = NULL;
8073                                         auth = NULL;
8074                                         auth_offset = 0;
8075                                         if (!no_out_cnt)
8076                                                 *num_out += ctl_cnt;
8077                                         /* recalc a clean slate and setup */
8078                                         switch (net->ro._l_addr.sa.sa_family) {
8079 #ifdef INET
8080                                         case AF_INET:
8081                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8082                                                 break;
8083 #endif
8084 #ifdef INET6
8085                                         case AF_INET6:
8086                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8087                                                 break;
8088 #endif
8089                                         default:
8090                                                 /* TSNH */
8091                                                 mtu = net->mtu;
8092                                                 break;
8093                                         }
8094                                         to_out = 0;
8095                                         no_fragmentflg = 1;
8096                                 }
8097                         }
8098                 }
8099                 /************************/
8100                 /* Control transmission */
8101                 /************************/
8102                 /* Now first lets go through the control queue */
8103                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8104                         if ((sack_goes_to) &&
8105                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8106                             (chk->whoTo != sack_goes_to)) {
8107                                 /*
8108                                  * if we have a sack in queue, and we are
8109                                  * looking at an ecn echo that is NOT queued
8110                                  * to where the sack is going..
8111                                  */
8112                                 if (chk->whoTo == net) {
8113                                         /*
8114                                          * Don't transmit it to where its
8115                                          * going (current net)
8116                                          */
8117                                         continue;
8118                                 } else if (sack_goes_to == net) {
8119                                         /*
8120                                          * But do transmit it to this
8121                                          * address
8122                                          */
8123                                         goto skip_net_check;
8124                                 }
8125                         }
8126                         if (chk->whoTo == NULL) {
8127                                 if (asoc->alternate == NULL) {
8128                                         if (asoc->primary_destination != net) {
8129                                                 continue;
8130                                         }
8131                                 } else {
8132                                         if (asoc->alternate != net) {
8133                                                 continue;
8134                                         }
8135                                 }
8136                         } else {
8137                                 if (chk->whoTo != net) {
8138                                         continue;
8139                                 }
8140                         }
8141         skip_net_check:
8142                         if (chk->data == NULL) {
8143                                 continue;
8144                         }
8145                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8146                                 /*
8147                                  * It must be unsent. Cookies and ASCONF's
8148                                  * hang around but there timers will force
8149                                  * when marked for resend.
8150                                  */
8151                                 continue;
8152                         }
8153                         /*
8154                          * if no AUTH is yet included and this chunk
8155                          * requires it, make sure to account for it.  We
8156                          * don't apply the size until the AUTH chunk is
8157                          * actually added below in case there is no room for
8158                          * this chunk. NOTE: we overload the use of "omtu"
8159                          * here
8160                          */
8161                         if ((auth == NULL) &&
8162                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8163                             stcb->asoc.peer_auth_chunks)) {
8164                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8165                         } else
8166                                 omtu = 0;
8167                         /* Here we do NOT factor the r_mtu */
8168                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8169                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8170                                 /*
8171                                  * We probably should glom the mbuf chain
8172                                  * from the chk->data for control but the
8173                                  * problem is it becomes yet one more level
8174                                  * of tracking to do if for some reason
8175                                  * output fails. Then I have got to
8176                                  * reconstruct the merged control chain.. el
8177                                  * yucko.. for now we take the easy way and
8178                                  * do the copy
8179                                  */
8180                                 /*
8181                                  * Add an AUTH chunk, if chunk requires it
8182                                  * save the offset into the chain for AUTH
8183                                  */
8184                                 if ((auth == NULL) &&
8185                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8186                                     stcb->asoc.peer_auth_chunks))) {
8187                                         outchain = sctp_add_auth_chunk(outchain,
8188                                             &endoutchain,
8189                                             &auth,
8190                                             &auth_offset,
8191                                             stcb,
8192                                             chk->rec.chunk_id.id);
8193                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8194                                 }
8195                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8196                                     (int)chk->rec.chunk_id.can_take_data,
8197                                     chk->send_size, chk->copy_by_ref);
8198                                 if (outchain == NULL) {
8199                                         *reason_code = 8;
8200                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8201                                         return (ENOMEM);
8202                                 }
8203                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8204                                 /* update our MTU size */
8205                                 if (mtu > (chk->send_size + omtu))
8206                                         mtu -= (chk->send_size + omtu);
8207                                 else
8208                                         mtu = 0;
8209                                 to_out += (chk->send_size + omtu);
8210                                 /* Do clear IP_DF ? */
8211                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8212                                         no_fragmentflg = 0;
8213                                 }
8214                                 if (chk->rec.chunk_id.can_take_data)
8215                                         chk->data = NULL;
8216                                 /* Mark things to be removed, if needed */
8217                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8218                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8219                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8220                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8221                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8222                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8223                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8224                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8225                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8226                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8227                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8228                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8229                                                 hbflag = 1;
8230                                         }
8231                                         /* remove these chunks at the end */
8232                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8233                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8234                                                 /* turn off the timer */
8235                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8236                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8237                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8238                                                 }
8239                                         }
8240                                         ctl_cnt++;
8241                                 } else {
8242                                         /*
8243                                          * Other chunks, since they have
8244                                          * timers running (i.e. COOKIE) we
8245                                          * just "trust" that it gets sent or
8246                                          * retransmitted.
8247                                          */
8248                                         ctl_cnt++;
8249                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8250                                                 cookie = 1;
8251                                                 no_out_cnt = 1;
8252                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8253                                                 /*
8254                                                  * Increment ecne send count
8255                                                  * here this means we may be
8256                                                  * over-zealous in our
8257                                                  * counting if the send
8258                                                  * fails, but its the best
8259                                                  * place to do it (we used
8260                                                  * to do it in the queue of
8261                                                  * the chunk, but that did
8262                                                  * not tell how many times
8263                                                  * it was sent.
8264                                                  */
8265                                                 SCTP_STAT_INCR(sctps_sendecne);
8266                                         }
8267                                         chk->sent = SCTP_DATAGRAM_SENT;
8268                                         if (chk->whoTo == NULL) {
8269                                                 chk->whoTo = net;
8270                                                 atomic_add_int(&net->ref_count, 1);
8271                                         }
8272                                         chk->snd_count++;
8273                                 }
8274                                 if (mtu == 0) {
8275                                         /*
8276                                          * Ok we are out of room but we can
8277                                          * output without effecting the
8278                                          * flight size since this little guy
8279                                          * is a control only packet.
8280                                          */
8281                                         if (asconf) {
8282                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8283                                                 /*
8284                                                  * do NOT clear the asconf
8285                                                  * flag as it is used to do
8286                                                  * appropriate source
8287                                                  * address selection.
8288                                                  */
8289                                         }
8290                                         if (cookie) {
8291                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8292                                                 cookie = 0;
8293                                         }
8294                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8295                                             (struct sockaddr *)&net->ro._l_addr,
8296                                             outchain,
8297                                             auth_offset, auth,
8298                                             stcb->asoc.authinfo.active_keyid,
8299                                             no_fragmentflg, 0, asconf,
8300                                             inp->sctp_lport, stcb->rport,
8301                                             htonl(stcb->asoc.peer_vtag),
8302                                             net->port, NULL,
8303                                             0, 0,
8304                                             so_locked))) {
8305                                                 if (error == ENOBUFS) {
8306                                                         asoc->ifp_had_enobuf = 1;
8307                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8308                                                 }
8309                                                 if (from_where == 0) {
8310                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8311                                                 }
8312                                                 /* error, could not output */
8313                                                 if (hbflag) {
8314                                                         if (*now_filled == 0) {
8315                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8316                                                                 *now_filled = 1;
8317                                                                 *now = net->last_sent_time;
8318                                                         } else {
8319                                                                 net->last_sent_time = *now;
8320                                                         }
8321                                                         hbflag = 0;
8322                                                 }
8323                                                 if (error == EHOSTUNREACH) {
8324                                                         /*
8325                                                          * Destination went
8326                                                          * unreachable
8327                                                          * during this send
8328                                                          */
8329                                                         sctp_move_chunks_from_net(stcb, net);
8330                                                 }
8331                                                 *reason_code = 7;
8332                                                 continue;
8333                                         } else
8334                                                 asoc->ifp_had_enobuf = 0;
8335                                         /* Only HB or ASCONF advances time */
8336                                         if (hbflag) {
8337                                                 if (*now_filled == 0) {
8338                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8339                                                         *now_filled = 1;
8340                                                         *now = net->last_sent_time;
8341                                                 } else {
8342                                                         net->last_sent_time = *now;
8343                                                 }
8344                                                 hbflag = 0;
8345                                         }
8346                                         /*
8347                                          * increase the number we sent, if a
8348                                          * cookie is sent we don't tell them
8349                                          * any was sent out.
8350                                          */
8351                                         outchain = endoutchain = NULL;
8352                                         auth = NULL;
8353                                         auth_offset = 0;
8354                                         if (!no_out_cnt)
8355                                                 *num_out += ctl_cnt;
8356                                         /* recalc a clean slate and setup */
8357                                         switch (net->ro._l_addr.sa.sa_family) {
8358 #ifdef INET
8359                                         case AF_INET:
8360                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8361                                                 break;
8362 #endif
8363 #ifdef INET6
8364                                         case AF_INET6:
8365                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8366                                                 break;
8367 #endif
8368                                         default:
8369                                                 /* TSNH */
8370                                                 mtu = net->mtu;
8371                                                 break;
8372                                         }
8373                                         to_out = 0;
8374                                         no_fragmentflg = 1;
8375                                 }
8376                         }
8377                 }
8378                 /* JRI: if dest is in PF state, do not send data to it */
8379                 if ((asoc->sctp_cmt_on_off > 0) &&
8380                     (net != stcb->asoc.alternate) &&
8381                     (net->dest_state & SCTP_ADDR_PF)) {
8382                         goto no_data_fill;
8383                 }
8384                 if (net->flight_size >= net->cwnd) {
8385                         goto no_data_fill;
8386                 }
8387                 if ((asoc->sctp_cmt_on_off > 0) &&
8388                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8389                     (net->flight_size > max_rwnd_per_dest)) {
8390                         goto no_data_fill;
8391                 }
8392                 /*
8393                  * We need a specific accounting for the usage of the send
8394                  * buffer. We also need to check the number of messages per
8395                  * net. For now, this is better than nothing and it disabled
8396                  * by default...
8397                  */
8398                 if ((asoc->sctp_cmt_on_off > 0) &&
8399                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8400                     (max_send_per_dest > 0) &&
8401                     (net->flight_size > max_send_per_dest)) {
8402                         goto no_data_fill;
8403                 }
8404                 /*********************/
8405                 /* Data transmission */
8406                 /*********************/
8407                 /*
8408                  * if AUTH for DATA is required and no AUTH has been added
8409                  * yet, account for this in the mtu now... if no data can be
8410                  * bundled, this adjustment won't matter anyways since the
8411                  * packet will be going out...
8412                  */
8413                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8414                     stcb->asoc.peer_auth_chunks);
8415                 if (data_auth_reqd && (auth == NULL)) {
8416                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8417                 }
8418                 /* now lets add any data within the MTU constraints */
8419                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8420 #ifdef INET
8421                 case AF_INET:
8422                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8423                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8424                         else
8425                                 omtu = 0;
8426                         break;
8427 #endif
8428 #ifdef INET6
8429                 case AF_INET6:
8430                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8431                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8432                         else
8433                                 omtu = 0;
8434                         break;
8435 #endif
8436                 default:
8437                         /* TSNH */
8438                         omtu = 0;
8439                         break;
8440                 }
8441                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8442                     (skip_data_for_this_net == 0)) ||
8443                     (cookie)) {
8444                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8445                                 if (no_data_chunks) {
8446                                         /* let only control go out */
8447                                         *reason_code = 1;
8448                                         break;
8449                                 }
8450                                 if (net->flight_size >= net->cwnd) {
8451                                         /* skip this net, no room for data */
8452                                         *reason_code = 2;
8453                                         break;
8454                                 }
8455                                 if ((chk->whoTo != NULL) &&
8456                                     (chk->whoTo != net)) {
8457                                         /* Don't send the chunk on this net */
8458                                         continue;
8459                                 }
8460                                 if (asoc->sctp_cmt_on_off == 0) {
8461                                         if ((asoc->alternate) &&
8462                                             (asoc->alternate != net) &&
8463                                             (chk->whoTo == NULL)) {
8464                                                 continue;
8465                                         } else if ((net != asoc->primary_destination) &&
8466                                                     (asoc->alternate == NULL) &&
8467                                             (chk->whoTo == NULL)) {
8468                                                 continue;
8469                                         }
8470                                 }
8471                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8472                                         /*-
8473                                          * strange, we have a chunk that is
8474                                          * to big for its destination and
8475                                          * yet no fragment ok flag.
8476                                          * Something went wrong when the
8477                                          * PMTU changed...we did not mark
8478                                          * this chunk for some reason?? I
8479                                          * will fix it here by letting IP
8480                                          * fragment it for now and printing
8481                                          * a warning. This really should not
8482                                          * happen ...
8483                                          */
8484                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8485                                             chk->send_size, mtu);
8486                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8487                                 }
8488                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8489                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8490                                         struct sctp_data_chunk *dchkh;
8491
8492                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8493                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8494                                 }
8495                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8496                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8497                                         /* ok we will add this one */
8498
8499                                         /*
8500                                          * Add an AUTH chunk, if chunk
8501                                          * requires it, save the offset into
8502                                          * the chain for AUTH
8503                                          */
8504                                         if (data_auth_reqd) {
8505                                                 if (auth == NULL) {
8506                                                         outchain = sctp_add_auth_chunk(outchain,
8507                                                             &endoutchain,
8508                                                             &auth,
8509                                                             &auth_offset,
8510                                                             stcb,
8511                                                             SCTP_DATA);
8512                                                         auth_keyid = chk->auth_keyid;
8513                                                         override_ok = 0;
8514                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8515                                                 } else if (override_ok) {
8516                                                         /*
8517                                                          * use this data's
8518                                                          * keyid
8519                                                          */
8520                                                         auth_keyid = chk->auth_keyid;
8521                                                         override_ok = 0;
8522                                                 } else if (auth_keyid != chk->auth_keyid) {
8523                                                         /*
8524                                                          * different keyid,
8525                                                          * so done bundling
8526                                                          */
8527                                                         break;
8528                                                 }
8529                                         }
8530                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8531                                             chk->send_size, chk->copy_by_ref);
8532                                         if (outchain == NULL) {
8533                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8534                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8535                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8536                                                 }
8537                                                 *reason_code = 3;
8538                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8539                                                 return (ENOMEM);
8540                                         }
8541                                         /* upate our MTU size */
8542                                         /* Do clear IP_DF ? */
8543                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8544                                                 no_fragmentflg = 0;
8545                                         }
8546                                         /* unsigned subtraction of mtu */
8547                                         if (mtu > chk->send_size)
8548                                                 mtu -= chk->send_size;
8549                                         else
8550                                                 mtu = 0;
8551                                         /* unsigned subtraction of r_mtu */
8552                                         if (r_mtu > chk->send_size)
8553                                                 r_mtu -= chk->send_size;
8554                                         else
8555                                                 r_mtu = 0;
8556
8557                                         to_out += chk->send_size;
8558                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8559 #ifdef INVARIANTS
8560                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8561 #else
8562                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8563                                                     mx_mtu, to_out);
8564 #endif
8565                                         }
8566                                         chk->window_probe = 0;
8567                                         data_list[bundle_at++] = chk;
8568                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8569                                                 break;
8570                                         }
8571                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8572                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8573                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8574                                                 } else {
8575                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8576                                                 }
8577                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8578                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8579                                                         /*
8580                                                          * Count number of
8581                                                          * user msg's that
8582                                                          * were fragmented
8583                                                          * we do this by
8584                                                          * counting when we
8585                                                          * see a LAST
8586                                                          * fragment only.
8587                                                          */
8588                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8589                                         }
8590                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8591                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8592                                                         data_list[0]->window_probe = 1;
8593                                                         net->window_probe = 1;
8594                                                 }
8595                                                 break;
8596                                         }
8597                                 } else {
8598                                         /*
8599                                          * Must be sent in order of the
8600                                          * TSN's (on a network)
8601                                          */
8602                                         break;
8603                                 }
8604                         }       /* for (chunk gather loop for this net) */
8605                 }               /* if asoc.state OPEN */
8606 no_data_fill:
8607                 /* Is there something to send for this destination? */
8608                 if (outchain) {
8609                         /* We may need to start a control timer or two */
8610                         if (asconf) {
8611                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8612                                     stcb, net);
8613                                 /*
8614                                  * do NOT clear the asconf flag as it is
8615                                  * used to do appropriate source address
8616                                  * selection.
8617                                  */
8618                         }
8619                         if (cookie) {
8620                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8621                                 cookie = 0;
8622                         }
8623                         /* must start a send timer if data is being sent */
8624                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8625                                 /*
8626                                  * no timer running on this destination
8627                                  * restart it.
8628                                  */
8629                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8630                         }
8631                         /* Now send it, if there is anything to send :> */
8632                         if ((error = sctp_lowlevel_chunk_output(inp,
8633                             stcb,
8634                             net,
8635                             (struct sockaddr *)&net->ro._l_addr,
8636                             outchain,
8637                             auth_offset,
8638                             auth,
8639                             auth_keyid,
8640                             no_fragmentflg,
8641                             bundle_at,
8642                             asconf,
8643                             inp->sctp_lport, stcb->rport,
8644                             htonl(stcb->asoc.peer_vtag),
8645                             net->port, NULL,
8646                             0, 0,
8647                             so_locked))) {
8648                                 /* error, we could not output */
8649                                 if (error == ENOBUFS) {
8650                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8651                                         asoc->ifp_had_enobuf = 1;
8652                                 }
8653                                 if (from_where == 0) {
8654                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8655                                 }
8656                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8657                                 if (hbflag) {
8658                                         if (*now_filled == 0) {
8659                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8660                                                 *now_filled = 1;
8661                                                 *now = net->last_sent_time;
8662                                         } else {
8663                                                 net->last_sent_time = *now;
8664                                         }
8665                                         hbflag = 0;
8666                                 }
8667                                 if (error == EHOSTUNREACH) {
8668                                         /*
8669                                          * Destination went unreachable
8670                                          * during this send
8671                                          */
8672                                         sctp_move_chunks_from_net(stcb, net);
8673                                 }
8674                                 *reason_code = 6;
8675                                 /*-
8676                                  * I add this line to be paranoid. As far as
8677                                  * I can tell the continue, takes us back to
8678                                  * the top of the for, but just to make sure
8679                                  * I will reset these again here.
8680                                  */
8681                                 ctl_cnt = bundle_at = 0;
8682                                 continue;       /* This takes us back to the
8683                                                  * for() for the nets. */
8684                         } else {
8685                                 asoc->ifp_had_enobuf = 0;
8686                         }
8687                         endoutchain = NULL;
8688                         auth = NULL;
8689                         auth_offset = 0;
8690                         if (bundle_at || hbflag) {
8691                                 /* For data/asconf and hb set time */
8692                                 if (*now_filled == 0) {
8693                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8694                                         *now_filled = 1;
8695                                         *now = net->last_sent_time;
8696                                 } else {
8697                                         net->last_sent_time = *now;
8698                                 }
8699                         }
8700                         if (!no_out_cnt) {
8701                                 *num_out += (ctl_cnt + bundle_at);
8702                         }
8703                         if (bundle_at) {
8704                                 /* setup for a RTO measurement */
8705                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8706                                 /* fill time if not already filled */
8707                                 if (*now_filled == 0) {
8708                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8709                                         *now_filled = 1;
8710                                         *now = asoc->time_last_sent;
8711                                 } else {
8712                                         asoc->time_last_sent = *now;
8713                                 }
8714                                 if (net->rto_needed) {
8715                                         data_list[0]->do_rtt = 1;
8716                                         net->rto_needed = 0;
8717                                 }
8718                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8719                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8720                         }
8721                         if (one_chunk) {
8722                                 break;
8723                         }
8724                 }
8725                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8726                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8727                 }
8728         }
8729         if (old_start_at == NULL) {
8730                 old_start_at = start_at;
8731                 start_at = TAILQ_FIRST(&asoc->nets);
8732                 if (old_start_at)
8733                         goto again_one_more_time;
8734         }
8735         /*
8736          * At the end there should be no NON timed chunks hanging on this
8737          * queue.
8738          */
8739         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8740                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8741         }
8742         if ((*num_out == 0) && (*reason_code == 0)) {
8743                 *reason_code = 4;
8744         } else {
8745                 *reason_code = 5;
8746         }
8747         sctp_clean_up_ctl(stcb, asoc, so_locked);
8748         return (0);
8749 }
8750
8751 void
8752 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8753 {
8754         /*-
8755          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8756          * the control chunk queue.
8757          */
8758         struct sctp_chunkhdr *hdr;
8759         struct sctp_tmit_chunk *chk;
8760         struct mbuf *mat;
8761
8762         SCTP_TCB_LOCK_ASSERT(stcb);
8763         sctp_alloc_a_chunk(stcb, chk);
8764         if (chk == NULL) {
8765                 /* no memory */
8766                 sctp_m_freem(op_err);
8767                 return;
8768         }
8769         chk->copy_by_ref = 0;
8770         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8771         if (op_err == NULL) {
8772                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8773                 return;
8774         }
8775         chk->send_size = 0;
8776         mat = op_err;
8777         while (mat != NULL) {
8778                 chk->send_size += SCTP_BUF_LEN(mat);
8779                 mat = SCTP_BUF_NEXT(mat);
8780         }
8781         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8782         chk->rec.chunk_id.can_take_data = 1;
8783         chk->sent = SCTP_DATAGRAM_UNSENT;
8784         chk->snd_count = 0;
8785         chk->flags = 0;
8786         chk->asoc = &stcb->asoc;
8787         chk->data = op_err;
8788         chk->whoTo = NULL;
8789         hdr = mtod(op_err, struct sctp_chunkhdr *);
8790         hdr->chunk_type = SCTP_OPERATION_ERROR;
8791         hdr->chunk_flags = 0;
8792         hdr->chunk_length = htons(chk->send_size);
8793         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8794             chk,
8795             sctp_next);
8796         chk->asoc->ctrl_queue_cnt++;
8797 }
8798
8799 int
8800 sctp_send_cookie_echo(struct mbuf *m,
8801     int offset,
8802     struct sctp_tcb *stcb,
8803     struct sctp_nets *net)
8804 {
8805         /*-
8806          * pull out the cookie and put it at the front of the control chunk
8807          * queue.
8808          */
8809         int at;
8810         struct mbuf *cookie;
8811         struct sctp_paramhdr parm, *phdr;
8812         struct sctp_chunkhdr *hdr;
8813         struct sctp_tmit_chunk *chk;
8814         uint16_t ptype, plen;
8815
8816         /* First find the cookie in the param area */
8817         cookie = NULL;
8818         at = offset + sizeof(struct sctp_init_chunk);
8819
8820         SCTP_TCB_LOCK_ASSERT(stcb);
8821         do {
8822                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8823                 if (phdr == NULL) {
8824                         return (-3);
8825                 }
8826                 ptype = ntohs(phdr->param_type);
8827                 plen = ntohs(phdr->param_length);
8828                 if (ptype == SCTP_STATE_COOKIE) {
8829                         int pad;
8830
8831                         /* found the cookie */
8832                         if ((pad = (plen % 4))) {
8833                                 plen += 4 - pad;
8834                         }
8835                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8836                         if (cookie == NULL) {
8837                                 /* No memory */
8838                                 return (-2);
8839                         }
8840 #ifdef SCTP_MBUF_LOGGING
8841                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8842                                 struct mbuf *mat;
8843
8844                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8845                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8846                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8847                                         }
8848                                 }
8849                         }
8850 #endif
8851                         break;
8852                 }
8853                 at += SCTP_SIZE32(plen);
8854         } while (phdr);
8855         if (cookie == NULL) {
8856                 /* Did not find the cookie */
8857                 return (-3);
8858         }
8859         /* ok, we got the cookie lets change it into a cookie echo chunk */
8860
8861         /* first the change from param to cookie */
8862         hdr = mtod(cookie, struct sctp_chunkhdr *);
8863         hdr->chunk_type = SCTP_COOKIE_ECHO;
8864         hdr->chunk_flags = 0;
8865         /* get the chunk stuff now and place it in the FRONT of the queue */
8866         sctp_alloc_a_chunk(stcb, chk);
8867         if (chk == NULL) {
8868                 /* no memory */
8869                 sctp_m_freem(cookie);
8870                 return (-5);
8871         }
8872         chk->copy_by_ref = 0;
8873         chk->send_size = plen;
8874         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8875         chk->rec.chunk_id.can_take_data = 0;
8876         chk->sent = SCTP_DATAGRAM_UNSENT;
8877         chk->snd_count = 0;
8878         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8879         chk->asoc = &stcb->asoc;
8880         chk->data = cookie;
8881         chk->whoTo = net;
8882         atomic_add_int(&chk->whoTo->ref_count, 1);
8883         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8884         chk->asoc->ctrl_queue_cnt++;
8885         return (0);
8886 }
8887
8888 void
8889 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8890     struct mbuf *m,
8891     int offset,
8892     int chk_length,
8893     struct sctp_nets *net)
8894 {
8895         /*
8896          * take a HB request and make it into a HB ack and send it.
8897          */
8898         struct mbuf *outchain;
8899         struct sctp_chunkhdr *chdr;
8900         struct sctp_tmit_chunk *chk;
8901
8902
8903         if (net == NULL)
8904                 /* must have a net pointer */
8905                 return;
8906
8907         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8908         if (outchain == NULL) {
8909                 /* gak out of memory */
8910                 return;
8911         }
8912 #ifdef SCTP_MBUF_LOGGING
8913         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8914                 struct mbuf *mat;
8915
8916                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
8917                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8918                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8919                         }
8920                 }
8921         }
8922 #endif
8923         chdr = mtod(outchain, struct sctp_chunkhdr *);
8924         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8925         chdr->chunk_flags = 0;
8926         if (chk_length % 4) {
8927                 /* need pad */
8928                 uint32_t cpthis = 0;
8929                 int padlen;
8930
8931                 padlen = 4 - (chk_length % 4);
8932                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8933         }
8934         sctp_alloc_a_chunk(stcb, chk);
8935         if (chk == NULL) {
8936                 /* no memory */
8937                 sctp_m_freem(outchain);
8938                 return;
8939         }
8940         chk->copy_by_ref = 0;
8941         chk->send_size = chk_length;
8942         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8943         chk->rec.chunk_id.can_take_data = 1;
8944         chk->sent = SCTP_DATAGRAM_UNSENT;
8945         chk->snd_count = 0;
8946         chk->flags = 0;
8947         chk->asoc = &stcb->asoc;
8948         chk->data = outchain;
8949         chk->whoTo = net;
8950         atomic_add_int(&chk->whoTo->ref_count, 1);
8951         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8952         chk->asoc->ctrl_queue_cnt++;
8953 }
8954
8955 void
8956 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8957 {
8958         /* formulate and queue a cookie-ack back to sender */
8959         struct mbuf *cookie_ack;
8960         struct sctp_chunkhdr *hdr;
8961         struct sctp_tmit_chunk *chk;
8962
8963         cookie_ack = NULL;
8964         SCTP_TCB_LOCK_ASSERT(stcb);
8965
8966         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8967         if (cookie_ack == NULL) {
8968                 /* no mbuf's */
8969                 return;
8970         }
8971         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8972         sctp_alloc_a_chunk(stcb, chk);
8973         if (chk == NULL) {
8974                 /* no memory */
8975                 sctp_m_freem(cookie_ack);
8976                 return;
8977         }
8978         chk->copy_by_ref = 0;
8979         chk->send_size = sizeof(struct sctp_chunkhdr);
8980         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
8981         chk->rec.chunk_id.can_take_data = 1;
8982         chk->sent = SCTP_DATAGRAM_UNSENT;
8983         chk->snd_count = 0;
8984         chk->flags = 0;
8985         chk->asoc = &stcb->asoc;
8986         chk->data = cookie_ack;
8987         if (chk->asoc->last_control_chunk_from != NULL) {
8988                 chk->whoTo = chk->asoc->last_control_chunk_from;
8989                 atomic_add_int(&chk->whoTo->ref_count, 1);
8990         } else {
8991                 chk->whoTo = NULL;
8992         }
8993         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
8994         hdr->chunk_type = SCTP_COOKIE_ACK;
8995         hdr->chunk_flags = 0;
8996         hdr->chunk_length = htons(chk->send_size);
8997         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
8998         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8999         chk->asoc->ctrl_queue_cnt++;
9000         return;
9001 }
9002
9003
9004 void
9005 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9006 {
9007         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9008         struct mbuf *m_shutdown_ack;
9009         struct sctp_shutdown_ack_chunk *ack_cp;
9010         struct sctp_tmit_chunk *chk;
9011
9012         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9013         if (m_shutdown_ack == NULL) {
9014                 /* no mbuf's */
9015                 return;
9016         }
9017         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9018         sctp_alloc_a_chunk(stcb, chk);
9019         if (chk == NULL) {
9020                 /* no memory */
9021                 sctp_m_freem(m_shutdown_ack);
9022                 return;
9023         }
9024         chk->copy_by_ref = 0;
9025         chk->send_size = sizeof(struct sctp_chunkhdr);
9026         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9027         chk->rec.chunk_id.can_take_data = 1;
9028         chk->sent = SCTP_DATAGRAM_UNSENT;
9029         chk->snd_count = 0;
9030         chk->flags = 0;
9031         chk->asoc = &stcb->asoc;
9032         chk->data = m_shutdown_ack;
9033         chk->whoTo = net;
9034         if (chk->whoTo) {
9035                 atomic_add_int(&chk->whoTo->ref_count, 1);
9036         }
9037         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9038         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9039         ack_cp->ch.chunk_flags = 0;
9040         ack_cp->ch.chunk_length = htons(chk->send_size);
9041         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9042         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9043         chk->asoc->ctrl_queue_cnt++;
9044         return;
9045 }
9046
9047 void
9048 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9049 {
9050         /* formulate and queue a SHUTDOWN to the sender */
9051         struct mbuf *m_shutdown;
9052         struct sctp_shutdown_chunk *shutdown_cp;
9053         struct sctp_tmit_chunk *chk;
9054
9055         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9056         if (m_shutdown == NULL) {
9057                 /* no mbuf's */
9058                 return;
9059         }
9060         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9061         sctp_alloc_a_chunk(stcb, chk);
9062         if (chk == NULL) {
9063                 /* no memory */
9064                 sctp_m_freem(m_shutdown);
9065                 return;
9066         }
9067         chk->copy_by_ref = 0;
9068         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9069         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9070         chk->rec.chunk_id.can_take_data = 1;
9071         chk->sent = SCTP_DATAGRAM_UNSENT;
9072         chk->snd_count = 0;
9073         chk->flags = 0;
9074         chk->asoc = &stcb->asoc;
9075         chk->data = m_shutdown;
9076         chk->whoTo = net;
9077         if (chk->whoTo) {
9078                 atomic_add_int(&chk->whoTo->ref_count, 1);
9079         }
9080         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9081         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9082         shutdown_cp->ch.chunk_flags = 0;
9083         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9084         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9085         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9086         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9087         chk->asoc->ctrl_queue_cnt++;
9088         return;
9089 }
9090
9091 void
9092 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9093 {
9094         /*
9095          * formulate and queue an ASCONF to the peer. ASCONF parameters
9096          * should be queued on the assoc queue.
9097          */
9098         struct sctp_tmit_chunk *chk;
9099         struct mbuf *m_asconf;
9100         int len;
9101
9102         SCTP_TCB_LOCK_ASSERT(stcb);
9103
9104         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9105             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9106                 /* can't send a new one if there is one in flight already */
9107                 return;
9108         }
9109         /* compose an ASCONF chunk, maximum length is PMTU */
9110         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9111         if (m_asconf == NULL) {
9112                 return;
9113         }
9114         sctp_alloc_a_chunk(stcb, chk);
9115         if (chk == NULL) {
9116                 /* no memory */
9117                 sctp_m_freem(m_asconf);
9118                 return;
9119         }
9120         chk->copy_by_ref = 0;
9121         chk->data = m_asconf;
9122         chk->send_size = len;
9123         chk->rec.chunk_id.id = SCTP_ASCONF;
9124         chk->rec.chunk_id.can_take_data = 0;
9125         chk->sent = SCTP_DATAGRAM_UNSENT;
9126         chk->snd_count = 0;
9127         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9128         chk->asoc = &stcb->asoc;
9129         chk->whoTo = net;
9130         if (chk->whoTo) {
9131                 atomic_add_int(&chk->whoTo->ref_count, 1);
9132         }
9133         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9134         chk->asoc->ctrl_queue_cnt++;
9135         return;
9136 }
9137
9138 void
9139 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9140 {
9141         /*
9142          * formulate and queue a asconf-ack back to sender. the asconf-ack
9143          * must be stored in the tcb.
9144          */
9145         struct sctp_tmit_chunk *chk;
9146         struct sctp_asconf_ack *ack, *latest_ack;
9147         struct mbuf *m_ack;
9148         struct sctp_nets *net = NULL;
9149
9150         SCTP_TCB_LOCK_ASSERT(stcb);
9151         /* Get the latest ASCONF-ACK */
9152         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9153         if (latest_ack == NULL) {
9154                 return;
9155         }
9156         if (latest_ack->last_sent_to != NULL &&
9157             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9158                 /* we're doing a retransmission */
9159                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9160                 if (net == NULL) {
9161                         /* no alternate */
9162                         if (stcb->asoc.last_control_chunk_from == NULL) {
9163                                 if (stcb->asoc.alternate) {
9164                                         net = stcb->asoc.alternate;
9165                                 } else {
9166                                         net = stcb->asoc.primary_destination;
9167                                 }
9168                         } else {
9169                                 net = stcb->asoc.last_control_chunk_from;
9170                         }
9171                 }
9172         } else {
9173                 /* normal case */
9174                 if (stcb->asoc.last_control_chunk_from == NULL) {
9175                         if (stcb->asoc.alternate) {
9176                                 net = stcb->asoc.alternate;
9177                         } else {
9178                                 net = stcb->asoc.primary_destination;
9179                         }
9180                 } else {
9181                         net = stcb->asoc.last_control_chunk_from;
9182                 }
9183         }
9184         latest_ack->last_sent_to = net;
9185
9186         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9187                 if (ack->data == NULL) {
9188                         continue;
9189                 }
9190                 /* copy the asconf_ack */
9191                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9192                 if (m_ack == NULL) {
9193                         /* couldn't copy it */
9194                         return;
9195                 }
9196 #ifdef SCTP_MBUF_LOGGING
9197                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9198                         struct mbuf *mat;
9199
9200                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9201                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9202                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9203                                 }
9204                         }
9205                 }
9206 #endif
9207
9208                 sctp_alloc_a_chunk(stcb, chk);
9209                 if (chk == NULL) {
9210                         /* no memory */
9211                         if (m_ack)
9212                                 sctp_m_freem(m_ack);
9213                         return;
9214                 }
9215                 chk->copy_by_ref = 0;
9216
9217                 chk->whoTo = net;
9218                 if (chk->whoTo) {
9219                         atomic_add_int(&chk->whoTo->ref_count, 1);
9220                 }
9221                 chk->data = m_ack;
9222                 chk->send_size = 0;
9223                 /* Get size */
9224                 chk->send_size = ack->len;
9225                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9226                 chk->rec.chunk_id.can_take_data = 1;
9227                 chk->sent = SCTP_DATAGRAM_UNSENT;
9228                 chk->snd_count = 0;
9229                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9230                 chk->asoc = &stcb->asoc;
9231
9232                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9233                 chk->asoc->ctrl_queue_cnt++;
9234         }
9235         return;
9236 }
9237
9238
9239 static int
9240 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9241     struct sctp_tcb *stcb,
9242     struct sctp_association *asoc,
9243     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9244 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9245     SCTP_UNUSED
9246 #endif
9247 )
9248 {
9249         /*-
9250          * send out one MTU of retransmission. If fast_retransmit is
9251          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9252          * rwnd. For a Cookie or Asconf in the control chunk queue we
9253          * retransmit them by themselves.
9254          *
9255          * For data chunks we will pick out the lowest TSN's in the sent_queue
9256          * marked for resend and bundle them all together (up to a MTU of
9257          * destination). The address to send to should have been
9258          * selected/changed where the retransmission was marked (i.e. in FR
9259          * or t3-timeout routines).
9260          */
9261         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9262         struct sctp_tmit_chunk *chk, *fwd;
9263         struct mbuf *m, *endofchain;
9264         struct sctp_nets *net = NULL;
9265         uint32_t tsns_sent = 0;
9266         int no_fragmentflg, bundle_at, cnt_thru;
9267         unsigned int mtu;
9268         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9269         struct sctp_auth_chunk *auth = NULL;
9270         uint32_t auth_offset = 0;
9271         uint16_t auth_keyid;
9272         int override_ok = 1;
9273         int data_auth_reqd = 0;
9274         uint32_t dmtu = 0;
9275
9276         SCTP_TCB_LOCK_ASSERT(stcb);
9277         tmr_started = ctl_cnt = bundle_at = error = 0;
9278         no_fragmentflg = 1;
9279         fwd_tsn = 0;
9280         *cnt_out = 0;
9281         fwd = NULL;
9282         endofchain = m = NULL;
9283         auth_keyid = stcb->asoc.authinfo.active_keyid;
9284 #ifdef SCTP_AUDITING_ENABLED
9285         sctp_audit_log(0xC3, 1);
9286 #endif
9287         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9288             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9289                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9290                     asoc->sent_queue_retran_cnt);
9291                 asoc->sent_queue_cnt = 0;
9292                 asoc->sent_queue_cnt_removeable = 0;
9293                 /* send back 0/0 so we enter normal transmission */
9294                 *cnt_out = 0;
9295                 return (0);
9296         }
9297         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9298                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9299                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9300                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9301                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9302                                 continue;
9303                         }
9304                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9305                                 if (chk != asoc->str_reset) {
9306                                         /*
9307                                          * not eligible for retran if its
9308                                          * not ours
9309                                          */
9310                                         continue;
9311                                 }
9312                         }
9313                         ctl_cnt++;
9314                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9315                                 fwd_tsn = 1;
9316                         }
9317                         /*
9318                          * Add an AUTH chunk, if chunk requires it save the
9319                          * offset into the chain for AUTH
9320                          */
9321                         if ((auth == NULL) &&
9322                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9323                             stcb->asoc.peer_auth_chunks))) {
9324                                 m = sctp_add_auth_chunk(m, &endofchain,
9325                                     &auth, &auth_offset,
9326                                     stcb,
9327                                     chk->rec.chunk_id.id);
9328                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9329                         }
9330                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9331                         break;
9332                 }
9333         }
9334         one_chunk = 0;
9335         cnt_thru = 0;
9336         /* do we have control chunks to retransmit? */
9337         if (m != NULL) {
9338                 /* Start a timer no matter if we suceed or fail */
9339                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9340                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9341                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9342                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9343                 chk->snd_count++;       /* update our count */
9344                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9345                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9346                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9347                     no_fragmentflg, 0, 0,
9348                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9349                     chk->whoTo->port, NULL,
9350                     0, 0,
9351                     so_locked))) {
9352                         SCTP_STAT_INCR(sctps_lowlevelerr);
9353                         return (error);
9354                 }
9355                 endofchain = NULL;
9356                 auth = NULL;
9357                 auth_offset = 0;
9358                 /*
9359                  * We don't want to mark the net->sent time here since this
9360                  * we use this for HB and retrans cannot measure RTT
9361                  */
9362                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9363                 *cnt_out += 1;
9364                 chk->sent = SCTP_DATAGRAM_SENT;
9365                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9366                 if (fwd_tsn == 0) {
9367                         return (0);
9368                 } else {
9369                         /* Clean up the fwd-tsn list */
9370                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9371                         return (0);
9372                 }
9373         }
9374         /*
9375          * Ok, it is just data retransmission we need to do or that and a
9376          * fwd-tsn with it all.
9377          */
9378         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9379                 return (SCTP_RETRAN_DONE);
9380         }
9381         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9382             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9383                 /* not yet open, resend the cookie and that is it */
9384                 return (1);
9385         }
9386 #ifdef SCTP_AUDITING_ENABLED
9387         sctp_auditing(20, inp, stcb, NULL);
9388 #endif
9389         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9390         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9391                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9392                         /* No, not sent to this net or not ready for rtx */
9393                         continue;
9394                 }
9395                 if (chk->data == NULL) {
9396                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9397                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9398                         continue;
9399                 }
9400                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9401                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9402                         /* Gak, we have exceeded max unlucky retran, abort! */
9403                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9404                             chk->snd_count,
9405                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9406                         atomic_add_int(&stcb->asoc.refcnt, 1);
9407                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9408                         SCTP_TCB_LOCK(stcb);
9409                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9410                         return (SCTP_RETRAN_EXIT);
9411                 }
9412                 /* pick up the net */
9413                 net = chk->whoTo;
9414                 switch (net->ro._l_addr.sa.sa_family) {
9415 #ifdef INET
9416                 case AF_INET:
9417                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9418                         break;
9419 #endif
9420 #ifdef INET6
9421                 case AF_INET6:
9422                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9423                         break;
9424 #endif
9425                 default:
9426                         /* TSNH */
9427                         mtu = net->mtu;
9428                         break;
9429                 }
9430
9431                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9432                         /* No room in peers rwnd */
9433                         uint32_t tsn;
9434
9435                         tsn = asoc->last_acked_seq + 1;
9436                         if (tsn == chk->rec.data.TSN_seq) {
9437                                 /*
9438                                  * we make a special exception for this
9439                                  * case. The peer has no rwnd but is missing
9440                                  * the lowest chunk.. which is probably what
9441                                  * is holding up the rwnd.
9442                                  */
9443                                 goto one_chunk_around;
9444                         }
9445                         return (1);
9446                 }
9447 one_chunk_around:
9448                 if (asoc->peers_rwnd < mtu) {
9449                         one_chunk = 1;
9450                         if ((asoc->peers_rwnd == 0) &&
9451                             (asoc->total_flight == 0)) {
9452                                 chk->window_probe = 1;
9453                                 chk->whoTo->window_probe = 1;
9454                         }
9455                 }
9456 #ifdef SCTP_AUDITING_ENABLED
9457                 sctp_audit_log(0xC3, 2);
9458 #endif
9459                 bundle_at = 0;
9460                 m = NULL;
9461                 net->fast_retran_ip = 0;
9462                 if (chk->rec.data.doing_fast_retransmit == 0) {
9463                         /*
9464                          * if no FR in progress skip destination that have
9465                          * flight_size > cwnd.
9466                          */
9467                         if (net->flight_size >= net->cwnd) {
9468                                 continue;
9469                         }
9470                 } else {
9471                         /*
9472                          * Mark the destination net to have FR recovery
9473                          * limits put on it.
9474                          */
9475                         *fr_done = 1;
9476                         net->fast_retran_ip = 1;
9477                 }
9478
9479                 /*
9480                  * if no AUTH is yet included and this chunk requires it,
9481                  * make sure to account for it.  We don't apply the size
9482                  * until the AUTH chunk is actually added below in case
9483                  * there is no room for this chunk.
9484                  */
9485                 if (data_auth_reqd && (auth == NULL)) {
9486                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9487                 } else
9488                         dmtu = 0;
9489
9490                 if ((chk->send_size <= (mtu - dmtu)) ||
9491                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9492                         /* ok we will add this one */
9493                         if (data_auth_reqd) {
9494                                 if (auth == NULL) {
9495                                         m = sctp_add_auth_chunk(m,
9496                                             &endofchain,
9497                                             &auth,
9498                                             &auth_offset,
9499                                             stcb,
9500                                             SCTP_DATA);
9501                                         auth_keyid = chk->auth_keyid;
9502                                         override_ok = 0;
9503                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9504                                 } else if (override_ok) {
9505                                         auth_keyid = chk->auth_keyid;
9506                                         override_ok = 0;
9507                                 } else if (chk->auth_keyid != auth_keyid) {
9508                                         /* different keyid, so done bundling */
9509                                         break;
9510                                 }
9511                         }
9512                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9513                         if (m == NULL) {
9514                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9515                                 return (ENOMEM);
9516                         }
9517                         /* Do clear IP_DF ? */
9518                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9519                                 no_fragmentflg = 0;
9520                         }
9521                         /* upate our MTU size */
9522                         if (mtu > (chk->send_size + dmtu))
9523                                 mtu -= (chk->send_size + dmtu);
9524                         else
9525                                 mtu = 0;
9526                         data_list[bundle_at++] = chk;
9527                         if (one_chunk && (asoc->total_flight <= 0)) {
9528                                 SCTP_STAT_INCR(sctps_windowprobed);
9529                         }
9530                 }
9531                 if (one_chunk == 0) {
9532                         /*
9533                          * now are there anymore forward from chk to pick
9534                          * up?
9535                          */
9536                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9537                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9538                                         /* Nope, not for retran */
9539                                         continue;
9540                                 }
9541                                 if (fwd->whoTo != net) {
9542                                         /* Nope, not the net in question */
9543                                         continue;
9544                                 }
9545                                 if (data_auth_reqd && (auth == NULL)) {
9546                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9547                                 } else
9548                                         dmtu = 0;
9549                                 if (fwd->send_size <= (mtu - dmtu)) {
9550                                         if (data_auth_reqd) {
9551                                                 if (auth == NULL) {
9552                                                         m = sctp_add_auth_chunk(m,
9553                                                             &endofchain,
9554                                                             &auth,
9555                                                             &auth_offset,
9556                                                             stcb,
9557                                                             SCTP_DATA);
9558                                                         auth_keyid = fwd->auth_keyid;
9559                                                         override_ok = 0;
9560                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9561                                                 } else if (override_ok) {
9562                                                         auth_keyid = fwd->auth_keyid;
9563                                                         override_ok = 0;
9564                                                 } else if (fwd->auth_keyid != auth_keyid) {
9565                                                         /*
9566                                                          * different keyid,
9567                                                          * so done bundling
9568                                                          */
9569                                                         break;
9570                                                 }
9571                                         }
9572                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9573                                         if (m == NULL) {
9574                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9575                                                 return (ENOMEM);
9576                                         }
9577                                         /* Do clear IP_DF ? */
9578                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9579                                                 no_fragmentflg = 0;
9580                                         }
9581                                         /* upate our MTU size */
9582                                         if (mtu > (fwd->send_size + dmtu))
9583                                                 mtu -= (fwd->send_size + dmtu);
9584                                         else
9585                                                 mtu = 0;
9586                                         data_list[bundle_at++] = fwd;
9587                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9588                                                 break;
9589                                         }
9590                                 } else {
9591                                         /* can't fit so we are done */
9592                                         break;
9593                                 }
9594                         }
9595                 }
9596                 /* Is there something to send for this destination? */
9597                 if (m) {
9598                         /*
9599                          * No matter if we fail/or suceed we should start a
9600                          * timer. A failure is like a lost IP packet :-)
9601                          */
9602                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9603                                 /*
9604                                  * no timer running on this destination
9605                                  * restart it.
9606                                  */
9607                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9608                                 tmr_started = 1;
9609                         }
9610                         /* Now lets send it, if there is anything to send :> */
9611                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9612                             (struct sockaddr *)&net->ro._l_addr, m,
9613                             auth_offset, auth, auth_keyid,
9614                             no_fragmentflg, 0, 0,
9615                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9616                             net->port, NULL,
9617                             0, 0,
9618                             so_locked))) {
9619                                 /* error, we could not output */
9620                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9621                                 return (error);
9622                         }
9623                         endofchain = NULL;
9624                         auth = NULL;
9625                         auth_offset = 0;
9626                         /* For HB's */
9627                         /*
9628                          * We don't want to mark the net->sent time here
9629                          * since this we use this for HB and retrans cannot
9630                          * measure RTT
9631                          */
9632                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9633
9634                         /* For auto-close */
9635                         cnt_thru++;
9636                         if (*now_filled == 0) {
9637                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9638                                 *now = asoc->time_last_sent;
9639                                 *now_filled = 1;
9640                         } else {
9641                                 asoc->time_last_sent = *now;
9642                         }
9643                         *cnt_out += bundle_at;
9644 #ifdef SCTP_AUDITING_ENABLED
9645                         sctp_audit_log(0xC4, bundle_at);
9646 #endif
9647                         if (bundle_at) {
9648                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9649                         }
9650                         for (i = 0; i < bundle_at; i++) {
9651                                 SCTP_STAT_INCR(sctps_sendretransdata);
9652                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9653                                 /*
9654                                  * When we have a revoked data, and we
9655                                  * retransmit it, then we clear the revoked
9656                                  * flag since this flag dictates if we
9657                                  * subtracted from the fs
9658                                  */
9659                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9660                                         /* Deflate the cwnd */
9661                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9662                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9663                                 }
9664                                 data_list[i]->snd_count++;
9665                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9666                                 /* record the time */
9667                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9668                                 if (data_list[i]->book_size_scale) {
9669                                         /*
9670                                          * need to double the book size on
9671                                          * this one
9672                                          */
9673                                         data_list[i]->book_size_scale = 0;
9674                                         /*
9675                                          * Since we double the booksize, we
9676                                          * must also double the output queue
9677                                          * size, since this get shrunk when
9678                                          * we free by this amount.
9679                                          */
9680                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9681                                         data_list[i]->book_size *= 2;
9682
9683
9684                                 } else {
9685                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9686                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9687                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9688                                         }
9689                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9690                                             (uint32_t) (data_list[i]->send_size +
9691                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9692                                 }
9693                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9694                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9695                                             data_list[i]->whoTo->flight_size,
9696                                             data_list[i]->book_size,
9697                                             (uintptr_t) data_list[i]->whoTo,
9698                                             data_list[i]->rec.data.TSN_seq);
9699                                 }
9700                                 sctp_flight_size_increase(data_list[i]);
9701                                 sctp_total_flight_increase(stcb, data_list[i]);
9702                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9703                                         /* SWS sender side engages */
9704                                         asoc->peers_rwnd = 0;
9705                                 }
9706                                 if ((i == 0) &&
9707                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9708                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9709                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9710                                             (tmr_started == 0)) {
9711                                                 /*-
9712                                                  * ok we just fast-retrans'd
9713                                                  * the lowest TSN, i.e the
9714                                                  * first on the list. In
9715                                                  * this case we want to give
9716                                                  * some more time to get a
9717                                                  * SACK back without a
9718                                                  * t3-expiring.
9719                                                  */
9720                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9721                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9722                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9723                                         }
9724                                 }
9725                         }
9726                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9727                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9728                         }
9729 #ifdef SCTP_AUDITING_ENABLED
9730                         sctp_auditing(21, inp, stcb, NULL);
9731 #endif
9732                 } else {
9733                         /* None will fit */
9734                         return (1);
9735                 }
9736                 if (asoc->sent_queue_retran_cnt <= 0) {
9737                         /* all done we have no more to retran */
9738                         asoc->sent_queue_retran_cnt = 0;
9739                         break;
9740                 }
9741                 if (one_chunk) {
9742                         /* No more room in rwnd */
9743                         return (1);
9744                 }
9745                 /* stop the for loop here. we sent out a packet */
9746                 break;
9747         }
9748         return (0);
9749 }
9750
9751 static void
9752 sctp_timer_validation(struct sctp_inpcb *inp,
9753     struct sctp_tcb *stcb,
9754     struct sctp_association *asoc)
9755 {
9756         struct sctp_nets *net;
9757
9758         /* Validate that a timer is running somewhere */
9759         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9760                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9761                         /* Here is a timer */
9762                         return;
9763                 }
9764         }
9765         SCTP_TCB_LOCK_ASSERT(stcb);
9766         /* Gak, we did not have a timer somewhere */
9767         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9768         if (asoc->alternate) {
9769                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9770         } else {
9771                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9772         }
9773         return;
9774 }
9775
9776 void
9777 sctp_chunk_output(struct sctp_inpcb *inp,
9778     struct sctp_tcb *stcb,
9779     int from_where,
9780     int so_locked
9781 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9782     SCTP_UNUSED
9783 #endif
9784 )
9785 {
9786         /*-
9787          * Ok this is the generic chunk service queue. we must do the
9788          * following:
9789          * - See if there are retransmits pending, if so we must
9790          *   do these first.
9791          * - Service the stream queue that is next, moving any
9792          *   message (note I must get a complete message i.e.
9793          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9794          *   TSN's
9795          * - Check to see if the cwnd/rwnd allows any output, if so we
9796          *   go ahead and fomulate and send the low level chunks. Making sure
9797          *   to combine any control in the control chunk queue also.
9798          */
9799         struct sctp_association *asoc;
9800         struct sctp_nets *net;
9801         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9802         unsigned int burst_cnt = 0;
9803         struct timeval now;
9804         int now_filled = 0;
9805         int nagle_on;
9806         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9807         int un_sent = 0;
9808         int fr_done;
9809         unsigned int tot_frs = 0;
9810
9811         asoc = &stcb->asoc;
9812         /* The Nagle algorithm is only applied when handling a send call. */
9813         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9814                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9815                         nagle_on = 0;
9816                 } else {
9817                         nagle_on = 1;
9818                 }
9819         } else {
9820                 nagle_on = 0;
9821         }
9822         SCTP_TCB_LOCK_ASSERT(stcb);
9823
9824         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9825
9826         if ((un_sent <= 0) &&
9827             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9828             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9829             (asoc->sent_queue_retran_cnt == 0)) {
9830                 /* Nothing to do unless there is something to be sent left */
9831                 return;
9832         }
9833         /*
9834          * Do we have something to send, data or control AND a sack timer
9835          * running, if so piggy-back the sack.
9836          */
9837         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9838                 sctp_send_sack(stcb, so_locked);
9839                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9840         }
9841         while (asoc->sent_queue_retran_cnt) {
9842                 /*-
9843                  * Ok, it is retransmission time only, we send out only ONE
9844                  * packet with a single call off to the retran code.
9845                  */
9846                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9847                         /*-
9848                          * Special hook for handling cookiess discarded
9849                          * by peer that carried data. Send cookie-ack only
9850                          * and then the next call with get the retran's.
9851                          */
9852                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9853                             from_where,
9854                             &now, &now_filled, frag_point, so_locked);
9855                         return;
9856                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9857                         /* if its not from a HB then do it */
9858                         fr_done = 0;
9859                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9860                         if (fr_done) {
9861                                 tot_frs++;
9862                         }
9863                 } else {
9864                         /*
9865                          * its from any other place, we don't allow retran
9866                          * output (only control)
9867                          */
9868                         ret = 1;
9869                 }
9870                 if (ret > 0) {
9871                         /* Can't send anymore */
9872                         /*-
9873                          * now lets push out control by calling med-level
9874                          * output once. this assures that we WILL send HB's
9875                          * if queued too.
9876                          */
9877                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9878                             from_where,
9879                             &now, &now_filled, frag_point, so_locked);
9880 #ifdef SCTP_AUDITING_ENABLED
9881                         sctp_auditing(8, inp, stcb, NULL);
9882 #endif
9883                         sctp_timer_validation(inp, stcb, asoc);
9884                         return;
9885                 }
9886                 if (ret < 0) {
9887                         /*-
9888                          * The count was off.. retran is not happening so do
9889                          * the normal retransmission.
9890                          */
9891 #ifdef SCTP_AUDITING_ENABLED
9892                         sctp_auditing(9, inp, stcb, NULL);
9893 #endif
9894                         if (ret == SCTP_RETRAN_EXIT) {
9895                                 return;
9896                         }
9897                         break;
9898                 }
9899                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9900                         /* Only one transmission allowed out of a timeout */
9901 #ifdef SCTP_AUDITING_ENABLED
9902                         sctp_auditing(10, inp, stcb, NULL);
9903 #endif
9904                         /* Push out any control */
9905                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9906                             &now, &now_filled, frag_point, so_locked);
9907                         return;
9908                 }
9909                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9910                         /* Hit FR burst limit */
9911                         return;
9912                 }
9913                 if ((num_out == 0) && (ret == 0)) {
9914                         /* No more retrans to send */
9915                         break;
9916                 }
9917         }
9918 #ifdef SCTP_AUDITING_ENABLED
9919         sctp_auditing(12, inp, stcb, NULL);
9920 #endif
9921         /* Check for bad destinations, if they exist move chunks around. */
9922         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9923                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9924                         /*-
9925                          * if possible move things off of this address we
9926                          * still may send below due to the dormant state but
9927                          * we try to find an alternate address to send to
9928                          * and if we have one we move all queued data on the
9929                          * out wheel to this alternate address.
9930                          */
9931                         if (net->ref_count > 1)
9932                                 sctp_move_chunks_from_net(stcb, net);
9933                 } else {
9934                         /*-
9935                          * if ((asoc->sat_network) || (net->addr_is_local))
9936                          * { burst_limit = asoc->max_burst *
9937                          * SCTP_SAT_NETWORK_BURST_INCR; }
9938                          */
9939                         if (asoc->max_burst > 0) {
9940                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9941                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9942                                                 /*
9943                                                  * JRS - Use the congestion
9944                                                  * control given in the
9945                                                  * congestion control module
9946                                                  */
9947                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9948                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9949                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9950                                                 }
9951                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9952                                         }
9953                                         net->fast_retran_ip = 0;
9954                                 } else {
9955                                         if (net->flight_size == 0) {
9956                                                 /*
9957                                                  * Should be decaying the
9958                                                  * cwnd here
9959                                                  */
9960                                                 ;
9961                                         }
9962                                 }
9963                         }
9964                 }
9965
9966         }
9967         burst_cnt = 0;
9968         do {
9969                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9970                     &reason_code, 0, from_where,
9971                     &now, &now_filled, frag_point, so_locked);
9972                 if (error) {
9973                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9974                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9975                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9976                         }
9977                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9978                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
9979                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
9980                         }
9981                         break;
9982                 }
9983                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
9984
9985                 tot_out += num_out;
9986                 burst_cnt++;
9987                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9988                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
9989                         if (num_out == 0) {
9990                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
9991                         }
9992                 }
9993                 if (nagle_on) {
9994                         /*
9995                          * When the Nagle algorithm is used, look at how
9996                          * much is unsent, then if its smaller than an MTU
9997                          * and we have data in flight we stop, except if we
9998                          * are handling a fragmented user message.
9999                          */
10000                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10001                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10002                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10003                             (stcb->asoc.total_flight > 0) &&
10004                             ((stcb->asoc.locked_on_sending == NULL) ||
10005                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10006                                 break;
10007                         }
10008                 }
10009                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10010                     TAILQ_EMPTY(&asoc->send_queue) &&
10011                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10012                         /* Nothing left to send */
10013                         break;
10014                 }
10015                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10016                         /* Nothing left to send */
10017                         break;
10018                 }
10019         } while (num_out &&
10020             ((asoc->max_burst == 0) ||
10021             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10022             (burst_cnt < asoc->max_burst)));
10023
10024         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10025                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10026                         SCTP_STAT_INCR(sctps_maxburstqueued);
10027                         asoc->burst_limit_applied = 1;
10028                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10029                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10030                         }
10031                 } else {
10032                         asoc->burst_limit_applied = 0;
10033                 }
10034         }
10035         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10036                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10037         }
10038         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10039             tot_out);
10040
10041         /*-
10042          * Now we need to clean up the control chunk chain if a ECNE is on
10043          * it. It must be marked as UNSENT again so next call will continue
10044          * to send it until such time that we get a CWR, to remove it.
10045          */
10046         if (stcb->asoc.ecn_echo_cnt_onq)
10047                 sctp_fix_ecn_echo(asoc);
10048         return;
10049 }
10050
10051
10052 int
10053 sctp_output(
10054     struct sctp_inpcb *inp,
10055     struct mbuf *m,
10056     struct sockaddr *addr,
10057     struct mbuf *control,
10058     struct thread *p,
10059     int flags)
10060 {
10061         if (inp == NULL) {
10062                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10063                 return (EINVAL);
10064         }
10065         if (inp->sctp_socket == NULL) {
10066                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10067                 return (EINVAL);
10068         }
10069         return (sctp_sosend(inp->sctp_socket,
10070             addr,
10071             (struct uio *)NULL,
10072             m,
10073             control,
10074             flags, p
10075             ));
10076 }
10077
10078 void
10079 send_forward_tsn(struct sctp_tcb *stcb,
10080     struct sctp_association *asoc)
10081 {
10082         struct sctp_tmit_chunk *chk;
10083         struct sctp_forward_tsn_chunk *fwdtsn;
10084         uint32_t advance_peer_ack_point;
10085
10086         SCTP_TCB_LOCK_ASSERT(stcb);
10087         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10088                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10089                         /* mark it to unsent */
10090                         chk->sent = SCTP_DATAGRAM_UNSENT;
10091                         chk->snd_count = 0;
10092                         /* Do we correct its output location? */
10093                         if (chk->whoTo) {
10094                                 sctp_free_remote_addr(chk->whoTo);
10095                                 chk->whoTo = NULL;
10096                         }
10097                         goto sctp_fill_in_rest;
10098                 }
10099         }
10100         /* Ok if we reach here we must build one */
10101         sctp_alloc_a_chunk(stcb, chk);
10102         if (chk == NULL) {
10103                 return;
10104         }
10105         asoc->fwd_tsn_cnt++;
10106         chk->copy_by_ref = 0;
10107         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10108         chk->rec.chunk_id.can_take_data = 0;
10109         chk->asoc = asoc;
10110         chk->whoTo = NULL;
10111         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10112         if (chk->data == NULL) {
10113                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10114                 return;
10115         }
10116         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10117         chk->sent = SCTP_DATAGRAM_UNSENT;
10118         chk->snd_count = 0;
10119         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10120         asoc->ctrl_queue_cnt++;
10121 sctp_fill_in_rest:
10122         /*-
10123          * Here we go through and fill out the part that deals with
10124          * stream/seq of the ones we skip.
10125          */
10126         SCTP_BUF_LEN(chk->data) = 0;
10127         {
10128                 struct sctp_tmit_chunk *at, *tp1, *last;
10129                 struct sctp_strseq *strseq;
10130                 unsigned int cnt_of_space, i, ovh;
10131                 unsigned int space_needed;
10132                 unsigned int cnt_of_skipped = 0;
10133
10134                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10135                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10136                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10137                                 /* no more to look at */
10138                                 break;
10139                         }
10140                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10141                                 /* We don't report these */
10142                                 continue;
10143                         }
10144                         cnt_of_skipped++;
10145                 }
10146                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10147                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10148
10149                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10150
10151                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10152                         ovh = SCTP_MIN_OVERHEAD;
10153                 } else {
10154                         ovh = SCTP_MIN_V4_OVERHEAD;
10155                 }
10156                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10157                         /* trim to a mtu size */
10158                         cnt_of_space = asoc->smallest_mtu - ovh;
10159                 }
10160                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10161                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10162                             0xff, 0, cnt_of_skipped,
10163                             asoc->advanced_peer_ack_point);
10164
10165                 }
10166                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10167                 if (cnt_of_space < space_needed) {
10168                         /*-
10169                          * ok we must trim down the chunk by lowering the
10170                          * advance peer ack point.
10171                          */
10172                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10173                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10174                                     0xff, 0xff, cnt_of_space,
10175                                     space_needed);
10176                         }
10177                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10178                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10179                         /*-
10180                          * Go through and find the TSN that will be the one
10181                          * we report.
10182                          */
10183                         at = TAILQ_FIRST(&asoc->sent_queue);
10184                         if (at != NULL) {
10185                                 for (i = 0; i < cnt_of_skipped; i++) {
10186                                         tp1 = TAILQ_NEXT(at, sctp_next);
10187                                         if (tp1 == NULL) {
10188                                                 break;
10189                                         }
10190                                         at = tp1;
10191                                 }
10192                         }
10193                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10194                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10195                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10196                                     asoc->advanced_peer_ack_point);
10197                         }
10198                         last = at;
10199                         /*-
10200                          * last now points to last one I can report, update
10201                          * peer ack point
10202                          */
10203                         if (last)
10204                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10205                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10206                             cnt_of_skipped * sizeof(struct sctp_strseq);
10207                 }
10208                 chk->send_size = space_needed;
10209                 /* Setup the chunk */
10210                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10211                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10212                 fwdtsn->ch.chunk_flags = 0;
10213                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10214                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10215                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10216                 fwdtsn++;
10217                 /*-
10218                  * Move pointer to after the fwdtsn and transfer to the
10219                  * strseq pointer.
10220                  */
10221                 strseq = (struct sctp_strseq *)fwdtsn;
10222                 /*-
10223                  * Now populate the strseq list. This is done blindly
10224                  * without pulling out duplicate stream info. This is
10225                  * inefficent but won't harm the process since the peer will
10226                  * look at these in sequence and will thus release anything.
10227                  * It could mean we exceed the PMTU and chop off some that
10228                  * we could have included.. but this is unlikely (aka 1432/4
10229                  * would mean 300+ stream seq's would have to be reported in
10230                  * one FWD-TSN. With a bit of work we can later FIX this to
10231                  * optimize and pull out duplcates.. but it does add more
10232                  * overhead. So for now... not!
10233                  */
10234                 at = TAILQ_FIRST(&asoc->sent_queue);
10235                 for (i = 0; i < cnt_of_skipped; i++) {
10236                         tp1 = TAILQ_NEXT(at, sctp_next);
10237                         if (tp1 == NULL)
10238                                 break;
10239                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10240                                 /* We don't report these */
10241                                 i--;
10242                                 at = tp1;
10243                                 continue;
10244                         }
10245                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10246                                 at->rec.data.fwd_tsn_cnt = 0;
10247                         }
10248                         strseq->stream = ntohs(at->rec.data.stream_number);
10249                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10250                         strseq++;
10251                         at = tp1;
10252                 }
10253         }
10254         return;
10255 }
10256
10257 void
10258 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10259 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10260     SCTP_UNUSED
10261 #endif
10262 )
10263 {
10264         /*-
10265          * Queue up a SACK or NR-SACK in the control queue.
10266          * We must first check to see if a SACK or NR-SACK is
10267          * somehow on the control queue.
10268          * If so, we will take and and remove the old one.
10269          */
10270         struct sctp_association *asoc;
10271         struct sctp_tmit_chunk *chk, *a_chk;
10272         struct sctp_sack_chunk *sack;
10273         struct sctp_nr_sack_chunk *nr_sack;
10274         struct sctp_gap_ack_block *gap_descriptor;
10275         struct sack_track *selector;
10276         int mergeable = 0;
10277         int offset;
10278         caddr_t limit;
10279         uint32_t *dup;
10280         int limit_reached = 0;
10281         unsigned int i, siz, j;
10282         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10283         int num_dups = 0;
10284         int space_req;
10285         uint32_t highest_tsn;
10286         uint8_t flags;
10287         uint8_t type;
10288         uint8_t tsn_map;
10289
10290         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10291             (stcb->asoc.peer_supports_nr_sack == 1)) {
10292                 type = SCTP_NR_SELECTIVE_ACK;
10293         } else {
10294                 type = SCTP_SELECTIVE_ACK;
10295         }
10296         a_chk = NULL;
10297         asoc = &stcb->asoc;
10298         SCTP_TCB_LOCK_ASSERT(stcb);
10299         if (asoc->last_data_chunk_from == NULL) {
10300                 /* Hmm we never received anything */
10301                 return;
10302         }
10303         sctp_slide_mapping_arrays(stcb);
10304         sctp_set_rwnd(stcb, asoc);
10305         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10306                 if (chk->rec.chunk_id.id == type) {
10307                         /* Hmm, found a sack already on queue, remove it */
10308                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10309                         asoc->ctrl_queue_cnt--;
10310                         a_chk = chk;
10311                         if (a_chk->data) {
10312                                 sctp_m_freem(a_chk->data);
10313                                 a_chk->data = NULL;
10314                         }
10315                         if (a_chk->whoTo) {
10316                                 sctp_free_remote_addr(a_chk->whoTo);
10317                                 a_chk->whoTo = NULL;
10318                         }
10319                         break;
10320                 }
10321         }
10322         if (a_chk == NULL) {
10323                 sctp_alloc_a_chunk(stcb, a_chk);
10324                 if (a_chk == NULL) {
10325                         /* No memory so we drop the idea, and set a timer */
10326                         if (stcb->asoc.delayed_ack) {
10327                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10328                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10329                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10330                                     stcb->sctp_ep, stcb, NULL);
10331                         } else {
10332                                 stcb->asoc.send_sack = 1;
10333                         }
10334                         return;
10335                 }
10336                 a_chk->copy_by_ref = 0;
10337                 a_chk->rec.chunk_id.id = type;
10338                 a_chk->rec.chunk_id.can_take_data = 1;
10339         }
10340         /* Clear our pkt counts */
10341         asoc->data_pkts_seen = 0;
10342
10343         a_chk->asoc = asoc;
10344         a_chk->snd_count = 0;
10345         a_chk->send_size = 0;   /* fill in later */
10346         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10347         a_chk->whoTo = NULL;
10348
10349         if ((asoc->numduptsns) ||
10350             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10351                 /*-
10352                  * Ok, we have some duplicates or the destination for the
10353                  * sack is unreachable, lets see if we can select an
10354                  * alternate than asoc->last_data_chunk_from
10355                  */
10356                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10357                     (asoc->used_alt_onsack > asoc->numnets)) {
10358                         /* We used an alt last time, don't this time */
10359                         a_chk->whoTo = NULL;
10360                 } else {
10361                         asoc->used_alt_onsack++;
10362                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10363                 }
10364                 if (a_chk->whoTo == NULL) {
10365                         /* Nope, no alternate */
10366                         a_chk->whoTo = asoc->last_data_chunk_from;
10367                         asoc->used_alt_onsack = 0;
10368                 }
10369         } else {
10370                 /*
10371                  * No duplicates so we use the last place we received data
10372                  * from.
10373                  */
10374                 asoc->used_alt_onsack = 0;
10375                 a_chk->whoTo = asoc->last_data_chunk_from;
10376         }
10377         if (a_chk->whoTo) {
10378                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10379         }
10380         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10381                 highest_tsn = asoc->highest_tsn_inside_map;
10382         } else {
10383                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10384         }
10385         if (highest_tsn == asoc->cumulative_tsn) {
10386                 /* no gaps */
10387                 if (type == SCTP_SELECTIVE_ACK) {
10388                         space_req = sizeof(struct sctp_sack_chunk);
10389                 } else {
10390                         space_req = sizeof(struct sctp_nr_sack_chunk);
10391                 }
10392         } else {
10393                 /* gaps get a cluster */
10394                 space_req = MCLBYTES;
10395         }
10396         /* Ok now lets formulate a MBUF with our sack */
10397         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10398         if ((a_chk->data == NULL) ||
10399             (a_chk->whoTo == NULL)) {
10400                 /* rats, no mbuf memory */
10401                 if (a_chk->data) {
10402                         /* was a problem with the destination */
10403                         sctp_m_freem(a_chk->data);
10404                         a_chk->data = NULL;
10405                 }
10406                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10407                 /* sa_ignore NO_NULL_CHK */
10408                 if (stcb->asoc.delayed_ack) {
10409                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10410                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10411                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10412                             stcb->sctp_ep, stcb, NULL);
10413                 } else {
10414                         stcb->asoc.send_sack = 1;
10415                 }
10416                 return;
10417         }
10418         /* ok, lets go through and fill it in */
10419         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10420         space = M_TRAILINGSPACE(a_chk->data);
10421         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10422                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10423         }
10424         limit = mtod(a_chk->data, caddr_t);
10425         limit += space;
10426
10427         flags = 0;
10428
10429         if ((asoc->sctp_cmt_on_off > 0) &&
10430             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10431                 /*-
10432                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10433                  * received, then set high bit to 1, else 0. Reset
10434                  * pkts_rcvd.
10435                  */
10436                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10437                 asoc->cmt_dac_pkts_rcvd = 0;
10438         }
10439 #ifdef SCTP_ASOCLOG_OF_TSNS
10440         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10441         stcb->asoc.cumack_log_atsnt++;
10442         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10443                 stcb->asoc.cumack_log_atsnt = 0;
10444         }
10445 #endif
10446         /* reset the readers interpretation */
10447         stcb->freed_by_sorcv_sincelast = 0;
10448
10449         if (type == SCTP_SELECTIVE_ACK) {
10450                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10451                 nr_sack = NULL;
10452                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10453                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10454                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10455                 } else {
10456                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10457                 }
10458         } else {
10459                 sack = NULL;
10460                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10461                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10462                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10463                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10464                 } else {
10465                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10466                 }
10467         }
10468
10469         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10470                 offset = 1;
10471         } else {
10472                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10473         }
10474         if (((type == SCTP_SELECTIVE_ACK) &&
10475             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10476             ((type == SCTP_NR_SELECTIVE_ACK) &&
10477             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10478                 /* we have a gap .. maybe */
10479                 for (i = 0; i < siz; i++) {
10480                         tsn_map = asoc->mapping_array[i];
10481                         if (type == SCTP_SELECTIVE_ACK) {
10482                                 tsn_map |= asoc->nr_mapping_array[i];
10483                         }
10484                         if (i == 0) {
10485                                 /*
10486                                  * Clear all bits corresponding to TSNs
10487                                  * smaller or equal to the cumulative TSN.
10488                                  */
10489                                 tsn_map &= (~0 << (1 - offset));
10490                         }
10491                         selector = &sack_array[tsn_map];
10492                         if (mergeable && selector->right_edge) {
10493                                 /*
10494                                  * Backup, left and right edges were ok to
10495                                  * merge.
10496                                  */
10497                                 num_gap_blocks--;
10498                                 gap_descriptor--;
10499                         }
10500                         if (selector->num_entries == 0)
10501                                 mergeable = 0;
10502                         else {
10503                                 for (j = 0; j < selector->num_entries; j++) {
10504                                         if (mergeable && selector->right_edge) {
10505                                                 /*
10506                                                  * do a merge by NOT setting
10507                                                  * the left side
10508                                                  */
10509                                                 mergeable = 0;
10510                                         } else {
10511                                                 /*
10512                                                  * no merge, set the left
10513                                                  * side
10514                                                  */
10515                                                 mergeable = 0;
10516                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10517                                         }
10518                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10519                                         num_gap_blocks++;
10520                                         gap_descriptor++;
10521                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10522                                                 /* no more room */
10523                                                 limit_reached = 1;
10524                                                 break;
10525                                         }
10526                                 }
10527                                 if (selector->left_edge) {
10528                                         mergeable = 1;
10529                                 }
10530                         }
10531                         if (limit_reached) {
10532                                 /* Reached the limit stop */
10533                                 break;
10534                         }
10535                         offset += 8;
10536                 }
10537         }
10538         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10539             (limit_reached == 0)) {
10540
10541                 mergeable = 0;
10542
10543                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10544                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10545                 } else {
10546                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10547                 }
10548
10549                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10550                         offset = 1;
10551                 } else {
10552                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10553                 }
10554                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10555                         /* we have a gap .. maybe */
10556                         for (i = 0; i < siz; i++) {
10557                                 tsn_map = asoc->nr_mapping_array[i];
10558                                 if (i == 0) {
10559                                         /*
10560                                          * Clear all bits corresponding to
10561                                          * TSNs smaller or equal to the
10562                                          * cumulative TSN.
10563                                          */
10564                                         tsn_map &= (~0 << (1 - offset));
10565                                 }
10566                                 selector = &sack_array[tsn_map];
10567                                 if (mergeable && selector->right_edge) {
10568                                         /*
10569                                          * Backup, left and right edges were
10570                                          * ok to merge.
10571                                          */
10572                                         num_nr_gap_blocks--;
10573                                         gap_descriptor--;
10574                                 }
10575                                 if (selector->num_entries == 0)
10576                                         mergeable = 0;
10577                                 else {
10578                                         for (j = 0; j < selector->num_entries; j++) {
10579                                                 if (mergeable && selector->right_edge) {
10580                                                         /*
10581                                                          * do a merge by NOT
10582                                                          * setting the left
10583                                                          * side
10584                                                          */
10585                                                         mergeable = 0;
10586                                                 } else {
10587                                                         /*
10588                                                          * no merge, set the
10589                                                          * left side
10590                                                          */
10591                                                         mergeable = 0;
10592                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10593                                                 }
10594                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10595                                                 num_nr_gap_blocks++;
10596                                                 gap_descriptor++;
10597                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10598                                                         /* no more room */
10599                                                         limit_reached = 1;
10600                                                         break;
10601                                                 }
10602                                         }
10603                                         if (selector->left_edge) {
10604                                                 mergeable = 1;
10605                                         }
10606                                 }
10607                                 if (limit_reached) {
10608                                         /* Reached the limit stop */
10609                                         break;
10610                                 }
10611                                 offset += 8;
10612                         }
10613                 }
10614         }
10615         /* now we must add any dups we are going to report. */
10616         if ((limit_reached == 0) && (asoc->numduptsns)) {
10617                 dup = (uint32_t *) gap_descriptor;
10618                 for (i = 0; i < asoc->numduptsns; i++) {
10619                         *dup = htonl(asoc->dup_tsns[i]);
10620                         dup++;
10621                         num_dups++;
10622                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10623                                 /* no more room */
10624                                 break;
10625                         }
10626                 }
10627                 asoc->numduptsns = 0;
10628         }
10629         /*
10630          * now that the chunk is prepared queue it to the control chunk
10631          * queue.
10632          */
10633         if (type == SCTP_SELECTIVE_ACK) {
10634                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10635                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10636                     num_dups * sizeof(int32_t);
10637                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10638                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10639                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10640                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10641                 sack->sack.num_dup_tsns = htons(num_dups);
10642                 sack->ch.chunk_type = type;
10643                 sack->ch.chunk_flags = flags;
10644                 sack->ch.chunk_length = htons(a_chk->send_size);
10645         } else {
10646                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10647                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10648                     num_dups * sizeof(int32_t);
10649                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10650                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10651                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10652                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10653                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10654                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10655                 nr_sack->nr_sack.reserved = 0;
10656                 nr_sack->ch.chunk_type = type;
10657                 nr_sack->ch.chunk_flags = flags;
10658                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10659         }
10660         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10661         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10662         asoc->ctrl_queue_cnt++;
10663         asoc->send_sack = 0;
10664         SCTP_STAT_INCR(sctps_sendsacks);
10665         return;
10666 }
10667
10668 void
10669 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10670 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10671     SCTP_UNUSED
10672 #endif
10673 )
10674 {
10675         struct mbuf *m_abort, *m, *m_last;
10676         struct mbuf *m_out, *m_end = NULL;
10677         struct sctp_abort_chunk *abort;
10678         struct sctp_auth_chunk *auth = NULL;
10679         struct sctp_nets *net;
10680         uint32_t vtag;
10681         uint32_t auth_offset = 0;
10682         uint16_t cause_len, chunk_len, padding_len;
10683
10684         SCTP_TCB_LOCK_ASSERT(stcb);
10685         /*-
10686          * Add an AUTH chunk, if chunk requires it and save the offset into
10687          * the chain for AUTH
10688          */
10689         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10690             stcb->asoc.peer_auth_chunks)) {
10691                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10692                     stcb, SCTP_ABORT_ASSOCIATION);
10693                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10694         } else {
10695                 m_out = NULL;
10696         }
10697         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10698         if (m_abort == NULL) {
10699                 if (m_out) {
10700                         sctp_m_freem(m_out);
10701                 }
10702                 if (operr) {
10703                         sctp_m_freem(operr);
10704                 }
10705                 return;
10706         }
10707         /* link in any error */
10708         SCTP_BUF_NEXT(m_abort) = operr;
10709         cause_len = 0;
10710         m_last = NULL;
10711         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10712                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10713                 if (SCTP_BUF_NEXT(m) == NULL) {
10714                         m_last = m;
10715                 }
10716         }
10717         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10718         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10719         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10720         if (m_out == NULL) {
10721                 /* NO Auth chunk prepended, so reserve space in front */
10722                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10723                 m_out = m_abort;
10724         } else {
10725                 /* Put AUTH chunk at the front of the chain */
10726                 SCTP_BUF_NEXT(m_end) = m_abort;
10727         }
10728         if (stcb->asoc.alternate) {
10729                 net = stcb->asoc.alternate;
10730         } else {
10731                 net = stcb->asoc.primary_destination;
10732         }
10733         /* Fill in the ABORT chunk header. */
10734         abort = mtod(m_abort, struct sctp_abort_chunk *);
10735         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10736         if (stcb->asoc.peer_vtag == 0) {
10737                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10738                 vtag = stcb->asoc.my_vtag;
10739                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10740         } else {
10741                 vtag = stcb->asoc.peer_vtag;
10742                 abort->ch.chunk_flags = 0;
10743         }
10744         abort->ch.chunk_length = htons(chunk_len);
10745         /* Add padding, if necessary. */
10746         if (padding_len > 0) {
10747                 if ((m_last == NULL) || sctp_add_pad_tombuf(m_last, padding_len)) {
10748                         sctp_m_freem(m_out);
10749                         return;
10750                 }
10751         }
10752         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10753             (struct sockaddr *)&net->ro._l_addr,
10754             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10755             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10756             stcb->asoc.primary_destination->port, NULL,
10757             0, 0,
10758             so_locked);
10759         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10760 }
10761
10762 void
10763 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10764     struct sctp_nets *net,
10765     int reflect_vtag)
10766 {
10767         /* formulate and SEND a SHUTDOWN-COMPLETE */
10768         struct mbuf *m_shutdown_comp;
10769         struct sctp_shutdown_complete_chunk *shutdown_complete;
10770         uint32_t vtag;
10771         uint8_t flags;
10772
10773         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10774         if (m_shutdown_comp == NULL) {
10775                 /* no mbuf's */
10776                 return;
10777         }
10778         if (reflect_vtag) {
10779                 flags = SCTP_HAD_NO_TCB;
10780                 vtag = stcb->asoc.my_vtag;
10781         } else {
10782                 flags = 0;
10783                 vtag = stcb->asoc.peer_vtag;
10784         }
10785         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10786         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10787         shutdown_complete->ch.chunk_flags = flags;
10788         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10789         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10790         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10791             (struct sockaddr *)&net->ro._l_addr,
10792             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10793             stcb->sctp_ep->sctp_lport, stcb->rport,
10794             htonl(vtag),
10795             net->port, NULL,
10796             0, 0,
10797             SCTP_SO_NOT_LOCKED);
10798         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10799         return;
10800 }
10801
10802 static void
10803 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10804     struct sctphdr *sh, uint32_t vtag,
10805     uint8_t type, struct mbuf *cause,
10806     uint8_t use_mflowid, uint32_t mflowid,
10807     uint32_t vrf_id, uint16_t port)
10808 {
10809         struct mbuf *o_pak;
10810         struct mbuf *mout;
10811         struct sctphdr *shout;
10812         struct sctp_chunkhdr *ch;
10813         struct udphdr *udp;
10814         int len, cause_len, padding_len, ret;
10815
10816 #ifdef INET
10817         struct sockaddr_in *src_sin, *dst_sin;
10818         struct ip *ip;
10819
10820 #endif
10821 #ifdef INET6
10822         struct sockaddr_in6 *src_sin6, *dst_sin6;
10823         struct ip6_hdr *ip6;
10824
10825 #endif
10826
10827         /* Compute the length of the cause and add final padding. */
10828         cause_len = 0;
10829         if (cause != NULL) {
10830                 struct mbuf *m_at, *m_last = NULL;
10831
10832                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10833                         if (SCTP_BUF_NEXT(m_at) == NULL)
10834                                 m_last = m_at;
10835                         cause_len += SCTP_BUF_LEN(m_at);
10836                 }
10837                 padding_len = cause_len % 4;
10838                 if (padding_len != 0) {
10839                         padding_len = 4 - padding_len;
10840                 }
10841                 if (padding_len != 0) {
10842                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10843                                 sctp_m_freem(cause);
10844                                 return;
10845                         }
10846                 }
10847         } else {
10848                 padding_len = 0;
10849         }
10850         /* Get an mbuf for the header. */
10851         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10852         switch (dst->sa_family) {
10853 #ifdef INET
10854         case AF_INET:
10855                 len += sizeof(struct ip);
10856                 break;
10857 #endif
10858 #ifdef INET6
10859         case AF_INET6:
10860                 len += sizeof(struct ip6_hdr);
10861                 break;
10862 #endif
10863         default:
10864                 break;
10865         }
10866         if (port) {
10867                 len += sizeof(struct udphdr);
10868         }
10869         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10870         if (mout == NULL) {
10871                 if (cause) {
10872                         sctp_m_freem(cause);
10873                 }
10874                 return;
10875         }
10876         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10877         SCTP_BUF_LEN(mout) = len;
10878         SCTP_BUF_NEXT(mout) = cause;
10879         if (use_mflowid != 0) {
10880                 mout->m_pkthdr.flowid = mflowid;
10881                 mout->m_flags |= M_FLOWID;
10882         }
10883 #ifdef INET
10884         ip = NULL;
10885 #endif
10886 #ifdef INET6
10887         ip6 = NULL;
10888 #endif
10889         switch (dst->sa_family) {
10890 #ifdef INET
10891         case AF_INET:
10892                 src_sin = (struct sockaddr_in *)src;
10893                 dst_sin = (struct sockaddr_in *)dst;
10894                 ip = mtod(mout, struct ip *);
10895                 ip->ip_v = IPVERSION;
10896                 ip->ip_hl = (sizeof(struct ip) >> 2);
10897                 ip->ip_tos = 0;
10898                 ip->ip_id = ip_newid();
10899                 ip->ip_off = 0;
10900                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10901                 if (port) {
10902                         ip->ip_p = IPPROTO_UDP;
10903                 } else {
10904                         ip->ip_p = IPPROTO_SCTP;
10905                 }
10906                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10907                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10908                 ip->ip_sum = 0;
10909                 len = sizeof(struct ip);
10910                 shout = (struct sctphdr *)((caddr_t)ip + len);
10911                 break;
10912 #endif
10913 #ifdef INET6
10914         case AF_INET6:
10915                 src_sin6 = (struct sockaddr_in6 *)src;
10916                 dst_sin6 = (struct sockaddr_in6 *)dst;
10917                 ip6 = mtod(mout, struct ip6_hdr *);
10918                 ip6->ip6_flow = htonl(0x60000000);
10919                 if (V_ip6_auto_flowlabel) {
10920                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10921                 }
10922                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10923                 if (port) {
10924                         ip6->ip6_nxt = IPPROTO_UDP;
10925                 } else {
10926                         ip6->ip6_nxt = IPPROTO_SCTP;
10927                 }
10928                 ip6->ip6_src = dst_sin6->sin6_addr;
10929                 ip6->ip6_dst = src_sin6->sin6_addr;
10930                 len = sizeof(struct ip6_hdr);
10931                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
10932                 break;
10933 #endif
10934         default:
10935                 len = 0;
10936                 shout = mtod(mout, struct sctphdr *);
10937                 break;
10938         }
10939         if (port) {
10940                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10941                         sctp_m_freem(mout);
10942                         return;
10943                 }
10944                 udp = (struct udphdr *)shout;
10945                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10946                 udp->uh_dport = port;
10947                 udp->uh_sum = 0;
10948                 udp->uh_ulen = htons(sizeof(struct udphdr) +
10949                     sizeof(struct sctphdr) +
10950                     sizeof(struct sctp_chunkhdr) +
10951                     cause_len + padding_len);
10952                 len += sizeof(struct udphdr);
10953                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
10954         } else {
10955                 udp = NULL;
10956         }
10957         shout->src_port = sh->dest_port;
10958         shout->dest_port = sh->src_port;
10959         shout->checksum = 0;
10960         if (vtag) {
10961                 shout->v_tag = htonl(vtag);
10962         } else {
10963                 shout->v_tag = sh->v_tag;
10964         }
10965         len += sizeof(struct sctphdr);
10966         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
10967         ch->chunk_type = type;
10968         if (vtag) {
10969                 ch->chunk_flags = 0;
10970         } else {
10971                 ch->chunk_flags = SCTP_HAD_NO_TCB;
10972         }
10973         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
10974         len += sizeof(struct sctp_chunkhdr);
10975         len += cause_len + padding_len;
10976
10977         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10978                 sctp_m_freem(mout);
10979                 return;
10980         }
10981         SCTP_ATTACH_CHAIN(o_pak, mout, len);
10982         switch (dst->sa_family) {
10983 #ifdef INET
10984         case AF_INET:
10985                 if (port) {
10986                         if (V_udp_cksum) {
10987                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10988                         } else {
10989                                 udp->uh_sum = 0;
10990                         }
10991                 }
10992                 ip->ip_len = len;
10993                 if (port) {
10994 #if defined(SCTP_WITH_NO_CSUM)
10995                         SCTP_STAT_INCR(sctps_sendnocrc);
10996 #else
10997                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
10998                         SCTP_STAT_INCR(sctps_sendswcrc);
10999 #endif
11000                         if (V_udp_cksum) {
11001                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11002                         }
11003                 } else {
11004 #if defined(SCTP_WITH_NO_CSUM)
11005                         SCTP_STAT_INCR(sctps_sendnocrc);
11006 #else
11007                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11008                         mout->m_pkthdr.csum_data = 0;
11009                         SCTP_STAT_INCR(sctps_sendhwcrc);
11010 #endif
11011                 }
11012 #ifdef SCTP_PACKET_LOGGING
11013                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11014                         sctp_packet_log(o_pak);
11015                 }
11016 #endif
11017                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11018                 break;
11019 #endif
11020 #ifdef INET6
11021         case AF_INET6:
11022                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11023                 if (port) {
11024 #if defined(SCTP_WITH_NO_CSUM)
11025                         SCTP_STAT_INCR(sctps_sendnocrc);
11026 #else
11027                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11028                         SCTP_STAT_INCR(sctps_sendswcrc);
11029 #endif
11030                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11031                                 udp->uh_sum = 0xffff;
11032                         }
11033                 } else {
11034 #if defined(SCTP_WITH_NO_CSUM)
11035                         SCTP_STAT_INCR(sctps_sendnocrc);
11036 #else
11037                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11038                         mout->m_pkthdr.csum_data = 0;
11039                         SCTP_STAT_INCR(sctps_sendhwcrc);
11040 #endif
11041                 }
11042 #ifdef SCTP_PACKET_LOGGING
11043                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11044                         sctp_packet_log(o_pak);
11045                 }
11046 #endif
11047                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11048                 break;
11049 #endif
11050         default:
11051                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11052                     dst->sa_family);
11053                 sctp_m_freem(mout);
11054                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11055                 return;
11056         }
11057         SCTP_STAT_INCR(sctps_sendpackets);
11058         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11059         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11060         return;
11061 }
11062
11063 void
11064 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11065     struct sctphdr *sh,
11066     uint8_t use_mflowid, uint32_t mflowid,
11067     uint32_t vrf_id, uint16_t port)
11068 {
11069         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11070             use_mflowid, mflowid,
11071             vrf_id, port);
11072 }
11073
11074 void
11075 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11076 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11077     SCTP_UNUSED
11078 #endif
11079 )
11080 {
11081         struct sctp_tmit_chunk *chk;
11082         struct sctp_heartbeat_chunk *hb;
11083         struct timeval now;
11084
11085         SCTP_TCB_LOCK_ASSERT(stcb);
11086         if (net == NULL) {
11087                 return;
11088         }
11089         (void)SCTP_GETTIME_TIMEVAL(&now);
11090         switch (net->ro._l_addr.sa.sa_family) {
11091 #ifdef INET
11092         case AF_INET:
11093                 break;
11094 #endif
11095 #ifdef INET6
11096         case AF_INET6:
11097                 break;
11098 #endif
11099         default:
11100                 return;
11101         }
11102         sctp_alloc_a_chunk(stcb, chk);
11103         if (chk == NULL) {
11104                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11105                 return;
11106         }
11107         chk->copy_by_ref = 0;
11108         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11109         chk->rec.chunk_id.can_take_data = 1;
11110         chk->asoc = &stcb->asoc;
11111         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11112
11113         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11114         if (chk->data == NULL) {
11115                 sctp_free_a_chunk(stcb, chk, so_locked);
11116                 return;
11117         }
11118         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11119         SCTP_BUF_LEN(chk->data) = chk->send_size;
11120         chk->sent = SCTP_DATAGRAM_UNSENT;
11121         chk->snd_count = 0;
11122         chk->whoTo = net;
11123         atomic_add_int(&chk->whoTo->ref_count, 1);
11124         /* Now we have a mbuf that we can fill in with the details */
11125         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11126         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11127         /* fill out chunk header */
11128         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11129         hb->ch.chunk_flags = 0;
11130         hb->ch.chunk_length = htons(chk->send_size);
11131         /* Fill out hb parameter */
11132         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11133         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11134         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11135         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11136         /* Did our user request this one, put it in */
11137         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11138         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11139         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11140                 /*
11141                  * we only take from the entropy pool if the address is not
11142                  * confirmed.
11143                  */
11144                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11145                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11146         } else {
11147                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11148                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11149         }
11150         switch (net->ro._l_addr.sa.sa_family) {
11151 #ifdef INET
11152         case AF_INET:
11153                 memcpy(hb->heartbeat.hb_info.address,
11154                     &net->ro._l_addr.sin.sin_addr,
11155                     sizeof(net->ro._l_addr.sin.sin_addr));
11156                 break;
11157 #endif
11158 #ifdef INET6
11159         case AF_INET6:
11160                 memcpy(hb->heartbeat.hb_info.address,
11161                     &net->ro._l_addr.sin6.sin6_addr,
11162                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11163                 break;
11164 #endif
11165         default:
11166                 return;
11167                 break;
11168         }
11169         net->hb_responded = 0;
11170         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11171         stcb->asoc.ctrl_queue_cnt++;
11172         SCTP_STAT_INCR(sctps_sendheartbeat);
11173         return;
11174 }
11175
11176 void
11177 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11178     uint32_t high_tsn)
11179 {
11180         struct sctp_association *asoc;
11181         struct sctp_ecne_chunk *ecne;
11182         struct sctp_tmit_chunk *chk;
11183
11184         if (net == NULL) {
11185                 return;
11186         }
11187         asoc = &stcb->asoc;
11188         SCTP_TCB_LOCK_ASSERT(stcb);
11189         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11190                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11191                         /* found a previous ECN_ECHO update it if needed */
11192                         uint32_t cnt, ctsn;
11193
11194                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11195                         ctsn = ntohl(ecne->tsn);
11196                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11197                                 ecne->tsn = htonl(high_tsn);
11198                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11199                         }
11200                         cnt = ntohl(ecne->num_pkts_since_cwr);
11201                         cnt++;
11202                         ecne->num_pkts_since_cwr = htonl(cnt);
11203                         return;
11204                 }
11205         }
11206         /* nope could not find one to update so we must build one */
11207         sctp_alloc_a_chunk(stcb, chk);
11208         if (chk == NULL) {
11209                 return;
11210         }
11211         chk->copy_by_ref = 0;
11212         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11213         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11214         chk->rec.chunk_id.can_take_data = 0;
11215         chk->asoc = &stcb->asoc;
11216         chk->send_size = sizeof(struct sctp_ecne_chunk);
11217         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11218         if (chk->data == NULL) {
11219                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11220                 return;
11221         }
11222         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11223         SCTP_BUF_LEN(chk->data) = chk->send_size;
11224         chk->sent = SCTP_DATAGRAM_UNSENT;
11225         chk->snd_count = 0;
11226         chk->whoTo = net;
11227         atomic_add_int(&chk->whoTo->ref_count, 1);
11228
11229         stcb->asoc.ecn_echo_cnt_onq++;
11230         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11231         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11232         ecne->ch.chunk_flags = 0;
11233         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11234         ecne->tsn = htonl(high_tsn);
11235         ecne->num_pkts_since_cwr = htonl(1);
11236         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11237         asoc->ctrl_queue_cnt++;
11238 }
11239
11240 void
11241 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11242     struct mbuf *m, int len, int iphlen, int bad_crc)
11243 {
11244         struct sctp_association *asoc;
11245         struct sctp_pktdrop_chunk *drp;
11246         struct sctp_tmit_chunk *chk;
11247         uint8_t *datap;
11248         int was_trunc = 0;
11249         int fullsz = 0;
11250         long spc;
11251         int offset;
11252         struct sctp_chunkhdr *ch, chunk_buf;
11253         unsigned int chk_length;
11254
11255         if (!stcb) {
11256                 return;
11257         }
11258         asoc = &stcb->asoc;
11259         SCTP_TCB_LOCK_ASSERT(stcb);
11260         if (asoc->peer_supports_pktdrop == 0) {
11261                 /*-
11262                  * peer must declare support before I send one.
11263                  */
11264                 return;
11265         }
11266         if (stcb->sctp_socket == NULL) {
11267                 return;
11268         }
11269         sctp_alloc_a_chunk(stcb, chk);
11270         if (chk == NULL) {
11271                 return;
11272         }
11273         chk->copy_by_ref = 0;
11274         len -= iphlen;
11275         chk->send_size = len;
11276         /* Validate that we do not have an ABORT in here. */
11277         offset = iphlen + sizeof(struct sctphdr);
11278         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11279             sizeof(*ch), (uint8_t *) & chunk_buf);
11280         while (ch != NULL) {
11281                 chk_length = ntohs(ch->chunk_length);
11282                 if (chk_length < sizeof(*ch)) {
11283                         /* break to abort land */
11284                         break;
11285                 }
11286                 switch (ch->chunk_type) {
11287                 case SCTP_PACKET_DROPPED:
11288                 case SCTP_ABORT_ASSOCIATION:
11289                 case SCTP_INITIATION_ACK:
11290                         /**
11291                          * We don't respond with an PKT-DROP to an ABORT
11292                          * or PKT-DROP. We also do not respond to an
11293                          * INIT-ACK, because we can't know if the initiation
11294                          * tag is correct or not.
11295                          */
11296                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11297                         return;
11298                 default:
11299                         break;
11300                 }
11301                 offset += SCTP_SIZE32(chk_length);
11302                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11303                     sizeof(*ch), (uint8_t *) & chunk_buf);
11304         }
11305
11306         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11307             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11308                 /*
11309                  * only send 1 mtu worth, trim off the excess on the end.
11310                  */
11311                 fullsz = len;
11312                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11313                 was_trunc = 1;
11314         }
11315         chk->asoc = &stcb->asoc;
11316         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11317         if (chk->data == NULL) {
11318 jump_out:
11319                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11320                 return;
11321         }
11322         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11323         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11324         if (drp == NULL) {
11325                 sctp_m_freem(chk->data);
11326                 chk->data = NULL;
11327                 goto jump_out;
11328         }
11329         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11330             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11331         chk->book_size_scale = 0;
11332         if (was_trunc) {
11333                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11334                 drp->trunc_len = htons(fullsz);
11335                 /*
11336                  * Len is already adjusted to size minus overhead above take
11337                  * out the pkt_drop chunk itself from it.
11338                  */
11339                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11340                 len = chk->send_size;
11341         } else {
11342                 /* no truncation needed */
11343                 drp->ch.chunk_flags = 0;
11344                 drp->trunc_len = htons(0);
11345         }
11346         if (bad_crc) {
11347                 drp->ch.chunk_flags |= SCTP_BADCRC;
11348         }
11349         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11350         SCTP_BUF_LEN(chk->data) = chk->send_size;
11351         chk->sent = SCTP_DATAGRAM_UNSENT;
11352         chk->snd_count = 0;
11353         if (net) {
11354                 /* we should hit here */
11355                 chk->whoTo = net;
11356                 atomic_add_int(&chk->whoTo->ref_count, 1);
11357         } else {
11358                 chk->whoTo = NULL;
11359         }
11360         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11361         chk->rec.chunk_id.can_take_data = 1;
11362         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11363         drp->ch.chunk_length = htons(chk->send_size);
11364         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11365         if (spc < 0) {
11366                 spc = 0;
11367         }
11368         drp->bottle_bw = htonl(spc);
11369         if (asoc->my_rwnd) {
11370                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11371                     asoc->size_on_all_streams +
11372                     asoc->my_rwnd_control_len +
11373                     stcb->sctp_socket->so_rcv.sb_cc);
11374         } else {
11375                 /*-
11376                  * If my rwnd is 0, possibly from mbuf depletion as well as
11377                  * space used, tell the peer there is NO space aka onq == bw
11378                  */
11379                 drp->current_onq = htonl(spc);
11380         }
11381         drp->reserved = 0;
11382         datap = drp->data;
11383         m_copydata(m, iphlen, len, (caddr_t)datap);
11384         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11385         asoc->ctrl_queue_cnt++;
11386 }
11387
11388 void
11389 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11390 {
11391         struct sctp_association *asoc;
11392         struct sctp_cwr_chunk *cwr;
11393         struct sctp_tmit_chunk *chk;
11394
11395         SCTP_TCB_LOCK_ASSERT(stcb);
11396         if (net == NULL) {
11397                 return;
11398         }
11399         asoc = &stcb->asoc;
11400         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11401                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11402                         /*
11403                          * found a previous CWR queued to same destination
11404                          * update it if needed
11405                          */
11406                         uint32_t ctsn;
11407
11408                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11409                         ctsn = ntohl(cwr->tsn);
11410                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11411                                 cwr->tsn = htonl(high_tsn);
11412                         }
11413                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11414                                 /* Make sure override is carried */
11415                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11416                         }
11417                         return;
11418                 }
11419         }
11420         sctp_alloc_a_chunk(stcb, chk);
11421         if (chk == NULL) {
11422                 return;
11423         }
11424         chk->copy_by_ref = 0;
11425         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11426         chk->rec.chunk_id.can_take_data = 1;
11427         chk->asoc = &stcb->asoc;
11428         chk->send_size = sizeof(struct sctp_cwr_chunk);
11429         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11430         if (chk->data == NULL) {
11431                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11432                 return;
11433         }
11434         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11435         SCTP_BUF_LEN(chk->data) = chk->send_size;
11436         chk->sent = SCTP_DATAGRAM_UNSENT;
11437         chk->snd_count = 0;
11438         chk->whoTo = net;
11439         atomic_add_int(&chk->whoTo->ref_count, 1);
11440         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11441         cwr->ch.chunk_type = SCTP_ECN_CWR;
11442         cwr->ch.chunk_flags = override;
11443         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11444         cwr->tsn = htonl(high_tsn);
11445         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11446         asoc->ctrl_queue_cnt++;
11447 }
11448
11449 void
11450 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11451     int number_entries, uint16_t * list,
11452     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11453 {
11454         uint16_t len, old_len, i;
11455         struct sctp_stream_reset_out_request *req_out;
11456         struct sctp_chunkhdr *ch;
11457
11458         ch = mtod(chk->data, struct sctp_chunkhdr *);
11459         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11460
11461         /* get to new offset for the param. */
11462         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11463         /* now how long will this param be? */
11464         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11465         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11466         req_out->ph.param_length = htons(len);
11467         req_out->request_seq = htonl(seq);
11468         req_out->response_seq = htonl(resp_seq);
11469         req_out->send_reset_at_tsn = htonl(last_sent);
11470         if (number_entries) {
11471                 for (i = 0; i < number_entries; i++) {
11472                         req_out->list_of_streams[i] = htons(list[i]);
11473                 }
11474         }
11475         if (SCTP_SIZE32(len) > len) {
11476                 /*-
11477                  * Need to worry about the pad we may end up adding to the
11478                  * end. This is easy since the struct is either aligned to 4
11479                  * bytes or 2 bytes off.
11480                  */
11481                 req_out->list_of_streams[number_entries] = 0;
11482         }
11483         /* now fix the chunk length */
11484         ch->chunk_length = htons(len + old_len);
11485         chk->book_size = len + old_len;
11486         chk->book_size_scale = 0;
11487         chk->send_size = SCTP_SIZE32(chk->book_size);
11488         SCTP_BUF_LEN(chk->data) = chk->send_size;
11489         return;
11490 }
11491
11492 static void
11493 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11494     int number_entries, uint16_t * list,
11495     uint32_t seq)
11496 {
11497         uint16_t len, old_len, i;
11498         struct sctp_stream_reset_in_request *req_in;
11499         struct sctp_chunkhdr *ch;
11500
11501         ch = mtod(chk->data, struct sctp_chunkhdr *);
11502         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11503
11504         /* get to new offset for the param. */
11505         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11506         /* now how long will this param be? */
11507         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11508         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11509         req_in->ph.param_length = htons(len);
11510         req_in->request_seq = htonl(seq);
11511         if (number_entries) {
11512                 for (i = 0; i < number_entries; i++) {
11513                         req_in->list_of_streams[i] = htons(list[i]);
11514                 }
11515         }
11516         if (SCTP_SIZE32(len) > len) {
11517                 /*-
11518                  * Need to worry about the pad we may end up adding to the
11519                  * end. This is easy since the struct is either aligned to 4
11520                  * bytes or 2 bytes off.
11521                  */
11522                 req_in->list_of_streams[number_entries] = 0;
11523         }
11524         /* now fix the chunk length */
11525         ch->chunk_length = htons(len + old_len);
11526         chk->book_size = len + old_len;
11527         chk->book_size_scale = 0;
11528         chk->send_size = SCTP_SIZE32(chk->book_size);
11529         SCTP_BUF_LEN(chk->data) = chk->send_size;
11530         return;
11531 }
11532
11533 static void
11534 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11535     uint32_t seq)
11536 {
11537         uint16_t len, old_len;
11538         struct sctp_stream_reset_tsn_request *req_tsn;
11539         struct sctp_chunkhdr *ch;
11540
11541         ch = mtod(chk->data, struct sctp_chunkhdr *);
11542         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11543
11544         /* get to new offset for the param. */
11545         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11546         /* now how long will this param be? */
11547         len = sizeof(struct sctp_stream_reset_tsn_request);
11548         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11549         req_tsn->ph.param_length = htons(len);
11550         req_tsn->request_seq = htonl(seq);
11551
11552         /* now fix the chunk length */
11553         ch->chunk_length = htons(len + old_len);
11554         chk->send_size = len + old_len;
11555         chk->book_size = SCTP_SIZE32(chk->send_size);
11556         chk->book_size_scale = 0;
11557         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11558         return;
11559 }
11560
11561 void
11562 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11563     uint32_t resp_seq, uint32_t result)
11564 {
11565         uint16_t len, old_len;
11566         struct sctp_stream_reset_response *resp;
11567         struct sctp_chunkhdr *ch;
11568
11569         ch = mtod(chk->data, struct sctp_chunkhdr *);
11570         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11571
11572         /* get to new offset for the param. */
11573         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11574         /* now how long will this param be? */
11575         len = sizeof(struct sctp_stream_reset_response);
11576         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11577         resp->ph.param_length = htons(len);
11578         resp->response_seq = htonl(resp_seq);
11579         resp->result = ntohl(result);
11580
11581         /* now fix the chunk length */
11582         ch->chunk_length = htons(len + old_len);
11583         chk->book_size = len + old_len;
11584         chk->book_size_scale = 0;
11585         chk->send_size = SCTP_SIZE32(chk->book_size);
11586         SCTP_BUF_LEN(chk->data) = chk->send_size;
11587         return;
11588 }
11589
11590 void
11591 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11592     uint32_t resp_seq, uint32_t result,
11593     uint32_t send_una, uint32_t recv_next)
11594 {
11595         uint16_t len, old_len;
11596         struct sctp_stream_reset_response_tsn *resp;
11597         struct sctp_chunkhdr *ch;
11598
11599         ch = mtod(chk->data, struct sctp_chunkhdr *);
11600         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11601
11602         /* get to new offset for the param. */
11603         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11604         /* now how long will this param be? */
11605         len = sizeof(struct sctp_stream_reset_response_tsn);
11606         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11607         resp->ph.param_length = htons(len);
11608         resp->response_seq = htonl(resp_seq);
11609         resp->result = htonl(result);
11610         resp->senders_next_tsn = htonl(send_una);
11611         resp->receivers_next_tsn = htonl(recv_next);
11612
11613         /* now fix the chunk length */
11614         ch->chunk_length = htons(len + old_len);
11615         chk->book_size = len + old_len;
11616         chk->send_size = SCTP_SIZE32(chk->book_size);
11617         chk->book_size_scale = 0;
11618         SCTP_BUF_LEN(chk->data) = chk->send_size;
11619         return;
11620 }
11621
11622 static void
11623 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11624     uint32_t seq,
11625     uint16_t adding)
11626 {
11627         uint16_t len, old_len;
11628         struct sctp_chunkhdr *ch;
11629         struct sctp_stream_reset_add_strm *addstr;
11630
11631         ch = mtod(chk->data, struct sctp_chunkhdr *);
11632         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11633
11634         /* get to new offset for the param. */
11635         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11636         /* now how long will this param be? */
11637         len = sizeof(struct sctp_stream_reset_add_strm);
11638
11639         /* Fill it out. */
11640         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11641         addstr->ph.param_length = htons(len);
11642         addstr->request_seq = htonl(seq);
11643         addstr->number_of_streams = htons(adding);
11644         addstr->reserved = 0;
11645
11646         /* now fix the chunk length */
11647         ch->chunk_length = htons(len + old_len);
11648         chk->send_size = len + old_len;
11649         chk->book_size = SCTP_SIZE32(chk->send_size);
11650         chk->book_size_scale = 0;
11651         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11652         return;
11653 }
11654
11655 static void
11656 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11657     uint32_t seq,
11658     uint16_t adding)
11659 {
11660         uint16_t len, old_len;
11661         struct sctp_chunkhdr *ch;
11662         struct sctp_stream_reset_add_strm *addstr;
11663
11664         ch = mtod(chk->data, struct sctp_chunkhdr *);
11665         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11666
11667         /* get to new offset for the param. */
11668         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11669         /* now how long will this param be? */
11670         len = sizeof(struct sctp_stream_reset_add_strm);
11671         /* Fill it out. */
11672         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11673         addstr->ph.param_length = htons(len);
11674         addstr->request_seq = htonl(seq);
11675         addstr->number_of_streams = htons(adding);
11676         addstr->reserved = 0;
11677
11678         /* now fix the chunk length */
11679         ch->chunk_length = htons(len + old_len);
11680         chk->send_size = len + old_len;
11681         chk->book_size = SCTP_SIZE32(chk->send_size);
11682         chk->book_size_scale = 0;
11683         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11684         return;
11685 }
11686
11687 int
11688 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11689     int number_entries, uint16_t * list,
11690     uint8_t send_out_req,
11691     uint8_t send_in_req,
11692     uint8_t send_tsn_req,
11693     uint8_t add_stream,
11694     uint16_t adding_o,
11695     uint16_t adding_i, uint8_t peer_asked)
11696 {
11697
11698         struct sctp_association *asoc;
11699         struct sctp_tmit_chunk *chk;
11700         struct sctp_chunkhdr *ch;
11701         uint32_t seq;
11702
11703         asoc = &stcb->asoc;
11704         if (asoc->stream_reset_outstanding) {
11705                 /*-
11706                  * Already one pending, must get ACK back to clear the flag.
11707                  */
11708                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11709                 return (EBUSY);
11710         }
11711         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11712             (add_stream == 0)) {
11713                 /* nothing to do */
11714                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11715                 return (EINVAL);
11716         }
11717         if (send_tsn_req && (send_out_req || send_in_req)) {
11718                 /* error, can't do that */
11719                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11720                 return (EINVAL);
11721         }
11722         sctp_alloc_a_chunk(stcb, chk);
11723         if (chk == NULL) {
11724                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11725                 return (ENOMEM);
11726         }
11727         chk->copy_by_ref = 0;
11728         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11729         chk->rec.chunk_id.can_take_data = 0;
11730         chk->asoc = &stcb->asoc;
11731         chk->book_size = sizeof(struct sctp_chunkhdr);
11732         chk->send_size = SCTP_SIZE32(chk->book_size);
11733         chk->book_size_scale = 0;
11734
11735         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11736         if (chk->data == NULL) {
11737                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11738                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11739                 return (ENOMEM);
11740         }
11741         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11742
11743         /* setup chunk parameters */
11744         chk->sent = SCTP_DATAGRAM_UNSENT;
11745         chk->snd_count = 0;
11746         if (stcb->asoc.alternate) {
11747                 chk->whoTo = stcb->asoc.alternate;
11748         } else {
11749                 chk->whoTo = stcb->asoc.primary_destination;
11750         }
11751         atomic_add_int(&chk->whoTo->ref_count, 1);
11752         ch = mtod(chk->data, struct sctp_chunkhdr *);
11753         ch->chunk_type = SCTP_STREAM_RESET;
11754         ch->chunk_flags = 0;
11755         ch->chunk_length = htons(chk->book_size);
11756         SCTP_BUF_LEN(chk->data) = chk->send_size;
11757
11758         seq = stcb->asoc.str_reset_seq_out;
11759         if (send_out_req) {
11760                 sctp_add_stream_reset_out(chk, number_entries, list,
11761                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11762                 asoc->stream_reset_out_is_outstanding = 1;
11763                 seq++;
11764                 asoc->stream_reset_outstanding++;
11765         }
11766         if ((add_stream & 1) &&
11767             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11768                 /* Need to allocate more */
11769                 struct sctp_stream_out *oldstream;
11770                 struct sctp_stream_queue_pending *sp, *nsp;
11771                 int i;
11772
11773                 oldstream = stcb->asoc.strmout;
11774                 /* get some more */
11775                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11776                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11777                     SCTP_M_STRMO);
11778                 if (stcb->asoc.strmout == NULL) {
11779                         uint8_t x;
11780
11781                         stcb->asoc.strmout = oldstream;
11782                         /* Turn off the bit */
11783                         x = add_stream & 0xfe;
11784                         add_stream = x;
11785                         goto skip_stuff;
11786                 }
11787                 /*
11788                  * Ok now we proceed with copying the old out stuff and
11789                  * initializing the new stuff.
11790                  */
11791                 SCTP_TCB_SEND_LOCK(stcb);
11792                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11793                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11794                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11795                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11796                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11797                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11798                         stcb->asoc.strmout[i].stream_no = i;
11799                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11800                         /* now anything on those queues? */
11801                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11802                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11803                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11804                         }
11805                         /* Now move assoc pointers too */
11806                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11807                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11808                         }
11809                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11810                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11811                         }
11812                 }
11813                 /* now the new streams */
11814                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11815                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11816                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11817                         stcb->asoc.strmout[i].chunks_on_queues = 0;
11818                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
11819                         stcb->asoc.strmout[i].stream_no = i;
11820                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11821                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11822                 }
11823                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11824                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11825                 SCTP_TCB_SEND_UNLOCK(stcb);
11826         }
11827 skip_stuff:
11828         if ((add_stream & 1) && (adding_o > 0)) {
11829                 asoc->strm_pending_add_size = adding_o;
11830                 asoc->peer_req_out = peer_asked;
11831                 sctp_add_an_out_stream(chk, seq, adding_o);
11832                 seq++;
11833                 asoc->stream_reset_outstanding++;
11834         }
11835         if ((add_stream & 2) && (adding_i > 0)) {
11836                 sctp_add_an_in_stream(chk, seq, adding_i);
11837                 seq++;
11838                 asoc->stream_reset_outstanding++;
11839         }
11840         if (send_in_req) {
11841                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11842                 seq++;
11843                 asoc->stream_reset_outstanding++;
11844         }
11845         if (send_tsn_req) {
11846                 sctp_add_stream_reset_tsn(chk, seq);
11847                 asoc->stream_reset_outstanding++;
11848         }
11849         asoc->str_reset = chk;
11850         /* insert the chunk for sending */
11851         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11852             chk,
11853             sctp_next);
11854         asoc->ctrl_queue_cnt++;
11855         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11856         return (0);
11857 }
11858
11859 void
11860 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11861     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11862     uint8_t use_mflowid, uint32_t mflowid,
11863     uint32_t vrf_id, uint16_t port)
11864 {
11865         /* Don't respond to an ABORT with an ABORT. */
11866         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11867                 if (cause)
11868                         sctp_m_freem(cause);
11869                 return;
11870         }
11871         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11872             use_mflowid, mflowid,
11873             vrf_id, port);
11874         return;
11875 }
11876
11877 void
11878 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11879     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11880     uint8_t use_mflowid, uint32_t mflowid,
11881     uint32_t vrf_id, uint16_t port)
11882 {
11883         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11884             use_mflowid, mflowid,
11885             vrf_id, port);
11886         return;
11887 }
11888
11889 static struct mbuf *
11890 sctp_copy_resume(struct uio *uio,
11891     int max_send_len,
11892     int user_marks_eor,
11893     int *error,
11894     uint32_t * sndout,
11895     struct mbuf **new_tail)
11896 {
11897         struct mbuf *m;
11898
11899         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11900             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11901         if (m == NULL) {
11902                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11903                 *error = ENOMEM;
11904         } else {
11905                 *sndout = m_length(m, NULL);
11906                 *new_tail = m_last(m);
11907         }
11908         return (m);
11909 }
11910
11911 static int
11912 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11913     struct uio *uio,
11914     int resv_upfront)
11915 {
11916         int left;
11917
11918         left = sp->length;
11919         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11920             resv_upfront, 0);
11921         if (sp->data == NULL) {
11922                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11923                 return (ENOMEM);
11924         }
11925         sp->tail_mbuf = m_last(sp->data);
11926         return (0);
11927 }
11928
11929
11930
11931 static struct sctp_stream_queue_pending *
11932 sctp_copy_it_in(struct sctp_tcb *stcb,
11933     struct sctp_association *asoc,
11934     struct sctp_sndrcvinfo *srcv,
11935     struct uio *uio,
11936     struct sctp_nets *net,
11937     int max_send_len,
11938     int user_marks_eor,
11939     int *error)
11940 {
11941         /*-
11942          * This routine must be very careful in its work. Protocol
11943          * processing is up and running so care must be taken to spl...()
11944          * when you need to do something that may effect the stcb/asoc. The
11945          * sb is locked however. When data is copied the protocol processing
11946          * should be enabled since this is a slower operation...
11947          */
11948         struct sctp_stream_queue_pending *sp = NULL;
11949         int resv_in_first;
11950
11951         *error = 0;
11952         /* Now can we send this? */
11953         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11954             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11955             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11956             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11957                 /* got data while shutting down */
11958                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11959                 *error = ECONNRESET;
11960                 goto out_now;
11961         }
11962         sctp_alloc_a_strmoq(stcb, sp);
11963         if (sp == NULL) {
11964                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11965                 *error = ENOMEM;
11966                 goto out_now;
11967         }
11968         sp->act_flags = 0;
11969         sp->sender_all_done = 0;
11970         sp->sinfo_flags = srcv->sinfo_flags;
11971         sp->timetolive = srcv->sinfo_timetolive;
11972         sp->ppid = srcv->sinfo_ppid;
11973         sp->context = srcv->sinfo_context;
11974         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11975
11976         sp->stream = srcv->sinfo_stream;
11977         sp->length = min(uio->uio_resid, max_send_len);
11978         if ((sp->length == (uint32_t) uio->uio_resid) &&
11979             ((user_marks_eor == 0) ||
11980             (srcv->sinfo_flags & SCTP_EOF) ||
11981             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11982                 sp->msg_is_complete = 1;
11983         } else {
11984                 sp->msg_is_complete = 0;
11985         }
11986         sp->sender_all_done = 0;
11987         sp->some_taken = 0;
11988         sp->put_last_out = 0;
11989         resv_in_first = sizeof(struct sctp_data_chunk);
11990         sp->data = sp->tail_mbuf = NULL;
11991         if (sp->length == 0) {
11992                 *error = 0;
11993                 goto skip_copy;
11994         }
11995         if (srcv->sinfo_keynumber_valid) {
11996                 sp->auth_keyid = srcv->sinfo_keynumber;
11997         } else {
11998                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
11999         }
12000         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12001                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12002                 sp->holds_key_ref = 1;
12003         }
12004         *error = sctp_copy_one(sp, uio, resv_in_first);
12005 skip_copy:
12006         if (*error) {
12007                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12008                 sp = NULL;
12009         } else {
12010                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12011                         sp->net = net;
12012                         atomic_add_int(&sp->net->ref_count, 1);
12013                 } else {
12014                         sp->net = NULL;
12015                 }
12016                 sctp_set_prsctp_policy(sp);
12017         }
12018 out_now:
12019         return (sp);
12020 }
12021
12022
12023 int
12024 sctp_sosend(struct socket *so,
12025     struct sockaddr *addr,
12026     struct uio *uio,
12027     struct mbuf *top,
12028     struct mbuf *control,
12029     int flags,
12030     struct thread *p
12031 )
12032 {
12033         int error, use_sndinfo = 0;
12034         struct sctp_sndrcvinfo sndrcvninfo;
12035         struct sockaddr *addr_to_use;
12036
12037 #if defined(INET) && defined(INET6)
12038         struct sockaddr_in sin;
12039
12040 #endif
12041
12042         if (control) {
12043                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12044                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12045                     sizeof(sndrcvninfo))) {
12046                         /* got one */
12047                         use_sndinfo = 1;
12048                 }
12049         }
12050         addr_to_use = addr;
12051 #if defined(INET) && defined(INET6)
12052         if ((addr) && (addr->sa_family == AF_INET6)) {
12053                 struct sockaddr_in6 *sin6;
12054
12055                 sin6 = (struct sockaddr_in6 *)addr;
12056                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12057                         in6_sin6_2_sin(&sin, sin6);
12058                         addr_to_use = (struct sockaddr *)&sin;
12059                 }
12060         }
12061 #endif
12062         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12063             control,
12064             flags,
12065             use_sndinfo ? &sndrcvninfo : NULL
12066             ,p
12067             );
12068         return (error);
12069 }
12070
12071
12072 int
12073 sctp_lower_sosend(struct socket *so,
12074     struct sockaddr *addr,
12075     struct uio *uio,
12076     struct mbuf *i_pak,
12077     struct mbuf *control,
12078     int flags,
12079     struct sctp_sndrcvinfo *srcv
12080     ,
12081     struct thread *p
12082 )
12083 {
12084         unsigned int sndlen = 0, max_len;
12085         int error, len;
12086         struct mbuf *top = NULL;
12087         int queue_only = 0, queue_only_for_init = 0;
12088         int free_cnt_applied = 0;
12089         int un_sent;
12090         int now_filled = 0;
12091         unsigned int inqueue_bytes = 0;
12092         struct sctp_block_entry be;
12093         struct sctp_inpcb *inp;
12094         struct sctp_tcb *stcb = NULL;
12095         struct timeval now;
12096         struct sctp_nets *net;
12097         struct sctp_association *asoc;
12098         struct sctp_inpcb *t_inp;
12099         int user_marks_eor;
12100         int create_lock_applied = 0;
12101         int nagle_applies = 0;
12102         int some_on_control = 0;
12103         int got_all_of_the_send = 0;
12104         int hold_tcblock = 0;
12105         int non_blocking = 0;
12106         uint32_t local_add_more, local_soresv = 0;
12107         uint16_t port;
12108         uint16_t sinfo_flags;
12109         sctp_assoc_t sinfo_assoc_id;
12110
12111         error = 0;
12112         net = NULL;
12113         stcb = NULL;
12114         asoc = NULL;
12115
12116         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12117         if (inp == NULL) {
12118                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12119                 error = EINVAL;
12120                 if (i_pak) {
12121                         SCTP_RELEASE_PKT(i_pak);
12122                 }
12123                 return (error);
12124         }
12125         if ((uio == NULL) && (i_pak == NULL)) {
12126                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12127                 return (EINVAL);
12128         }
12129         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12130         atomic_add_int(&inp->total_sends, 1);
12131         if (uio) {
12132                 if (uio->uio_resid < 0) {
12133                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12134                         return (EINVAL);
12135                 }
12136                 sndlen = uio->uio_resid;
12137         } else {
12138                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12139                 sndlen = SCTP_HEADER_LEN(i_pak);
12140         }
12141         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12142             (void *)addr,
12143             sndlen);
12144         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12145             (inp->sctp_socket->so_qlimit)) {
12146                 /* The listener can NOT send */
12147                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12148                 error = ENOTCONN;
12149                 goto out_unlocked;
12150         }
12151         /**
12152          * Pre-screen address, if one is given the sin-len
12153          * must be set correctly!
12154          */
12155         if (addr) {
12156                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12157
12158                 switch (raddr->sa.sa_family) {
12159 #ifdef INET
12160                 case AF_INET:
12161                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12162                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12163                                 error = EINVAL;
12164                                 goto out_unlocked;
12165                         }
12166                         port = raddr->sin.sin_port;
12167                         break;
12168 #endif
12169 #ifdef INET6
12170                 case AF_INET6:
12171                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12172                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12173                                 error = EINVAL;
12174                                 goto out_unlocked;
12175                         }
12176                         port = raddr->sin6.sin6_port;
12177                         break;
12178 #endif
12179                 default:
12180                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12181                         error = EAFNOSUPPORT;
12182                         goto out_unlocked;
12183                 }
12184         } else
12185                 port = 0;
12186
12187         if (srcv) {
12188                 sinfo_flags = srcv->sinfo_flags;
12189                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12190                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12191                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12192                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12193                         error = EINVAL;
12194                         goto out_unlocked;
12195                 }
12196                 if (srcv->sinfo_flags)
12197                         SCTP_STAT_INCR(sctps_sends_with_flags);
12198         } else {
12199                 sinfo_flags = inp->def_send.sinfo_flags;
12200                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12201         }
12202         if (sinfo_flags & SCTP_SENDALL) {
12203                 /* its a sendall */
12204                 error = sctp_sendall(inp, uio, top, srcv);
12205                 top = NULL;
12206                 goto out_unlocked;
12207         }
12208         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12209                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12210                 error = EINVAL;
12211                 goto out_unlocked;
12212         }
12213         /* now we must find the assoc */
12214         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12215             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12216                 SCTP_INP_RLOCK(inp);
12217                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12218                 if (stcb) {
12219                         SCTP_TCB_LOCK(stcb);
12220                         hold_tcblock = 1;
12221                 }
12222                 SCTP_INP_RUNLOCK(inp);
12223         } else if (sinfo_assoc_id) {
12224                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12225         } else if (addr) {
12226                 /*-
12227                  * Since we did not use findep we must
12228                  * increment it, and if we don't find a tcb
12229                  * decrement it.
12230                  */
12231                 SCTP_INP_WLOCK(inp);
12232                 SCTP_INP_INCR_REF(inp);
12233                 SCTP_INP_WUNLOCK(inp);
12234                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12235                 if (stcb == NULL) {
12236                         SCTP_INP_WLOCK(inp);
12237                         SCTP_INP_DECR_REF(inp);
12238                         SCTP_INP_WUNLOCK(inp);
12239                 } else {
12240                         hold_tcblock = 1;
12241                 }
12242         }
12243         if ((stcb == NULL) && (addr)) {
12244                 /* Possible implicit send? */
12245                 SCTP_ASOC_CREATE_LOCK(inp);
12246                 create_lock_applied = 1;
12247                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12248                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12249                         /* Should I really unlock ? */
12250                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12251                         error = EINVAL;
12252                         goto out_unlocked;
12253
12254                 }
12255                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12256                     (addr->sa_family == AF_INET6)) {
12257                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12258                         error = EINVAL;
12259                         goto out_unlocked;
12260                 }
12261                 SCTP_INP_WLOCK(inp);
12262                 SCTP_INP_INCR_REF(inp);
12263                 SCTP_INP_WUNLOCK(inp);
12264                 /* With the lock applied look again */
12265                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12266                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12267                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12268                 }
12269                 if (stcb == NULL) {
12270                         SCTP_INP_WLOCK(inp);
12271                         SCTP_INP_DECR_REF(inp);
12272                         SCTP_INP_WUNLOCK(inp);
12273                 } else {
12274                         hold_tcblock = 1;
12275                 }
12276                 if (error) {
12277                         goto out_unlocked;
12278                 }
12279                 if (t_inp != inp) {
12280                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12281                         error = ENOTCONN;
12282                         goto out_unlocked;
12283                 }
12284         }
12285         if (stcb == NULL) {
12286                 if (addr == NULL) {
12287                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12288                         error = ENOENT;
12289                         goto out_unlocked;
12290                 } else {
12291                         /* We must go ahead and start the INIT process */
12292                         uint32_t vrf_id;
12293
12294                         if ((sinfo_flags & SCTP_ABORT) ||
12295                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12296                                 /*-
12297                                  * User asks to abort a non-existant assoc,
12298                                  * or EOF a non-existant assoc with no data
12299                                  */
12300                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12301                                 error = ENOENT;
12302                                 goto out_unlocked;
12303                         }
12304                         /* get an asoc/stcb struct */
12305                         vrf_id = inp->def_vrf_id;
12306 #ifdef INVARIANTS
12307                         if (create_lock_applied == 0) {
12308                                 panic("Error, should hold create lock and I don't?");
12309                         }
12310 #endif
12311                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12312                             p
12313                             );
12314                         if (stcb == NULL) {
12315                                 /* Error is setup for us in the call */
12316                                 goto out_unlocked;
12317                         }
12318                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12319                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12320                                 /*
12321                                  * Set the connected flag so we can queue
12322                                  * data
12323                                  */
12324                                 soisconnecting(so);
12325                         }
12326                         hold_tcblock = 1;
12327                         if (create_lock_applied) {
12328                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12329                                 create_lock_applied = 0;
12330                         } else {
12331                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12332                         }
12333                         /*
12334                          * Turn on queue only flag to prevent data from
12335                          * being sent
12336                          */
12337                         queue_only = 1;
12338                         asoc = &stcb->asoc;
12339                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12340                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12341
12342                         /* initialize authentication params for the assoc */
12343                         sctp_initialize_auth_params(inp, stcb);
12344
12345                         if (control) {
12346                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12347                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12348                                         hold_tcblock = 0;
12349                                         stcb = NULL;
12350                                         goto out_unlocked;
12351                                 }
12352                         }
12353                         /* out with the INIT */
12354                         queue_only_for_init = 1;
12355                         /*-
12356                          * we may want to dig in after this call and adjust the MTU
12357                          * value. It defaulted to 1500 (constant) but the ro
12358                          * structure may now have an update and thus we may need to
12359                          * change it BEFORE we append the message.
12360                          */
12361                 }
12362         } else
12363                 asoc = &stcb->asoc;
12364         if (srcv == NULL)
12365                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12366         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12367                 if (addr)
12368                         net = sctp_findnet(stcb, addr);
12369                 else
12370                         net = NULL;
12371                 if ((net == NULL) ||
12372                     ((port != 0) && (port != stcb->rport))) {
12373                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12374                         error = EINVAL;
12375                         goto out_unlocked;
12376                 }
12377         } else {
12378                 if (stcb->asoc.alternate) {
12379                         net = stcb->asoc.alternate;
12380                 } else {
12381                         net = stcb->asoc.primary_destination;
12382                 }
12383         }
12384         atomic_add_int(&stcb->total_sends, 1);
12385         /* Keep the stcb from being freed under our feet */
12386         atomic_add_int(&asoc->refcnt, 1);
12387         free_cnt_applied = 1;
12388
12389         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12390                 if (sndlen > asoc->smallest_mtu) {
12391                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12392                         error = EMSGSIZE;
12393                         goto out_unlocked;
12394                 }
12395         }
12396         if (SCTP_SO_IS_NBIO(so)
12397             || (flags & MSG_NBIO)
12398             ) {
12399                 non_blocking = 1;
12400         }
12401         /* would we block? */
12402         if (non_blocking) {
12403                 if (hold_tcblock == 0) {
12404                         SCTP_TCB_LOCK(stcb);
12405                         hold_tcblock = 1;
12406                 }
12407                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12408                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12409                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12410                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12411                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12412                                 error = EMSGSIZE;
12413                         else
12414                                 error = EWOULDBLOCK;
12415                         goto out_unlocked;
12416                 }
12417                 stcb->asoc.sb_send_resv += sndlen;
12418                 SCTP_TCB_UNLOCK(stcb);
12419                 hold_tcblock = 0;
12420         } else {
12421                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12422         }
12423         local_soresv = sndlen;
12424         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12425                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12426                 error = ECONNRESET;
12427                 goto out_unlocked;
12428         }
12429         if (create_lock_applied) {
12430                 SCTP_ASOC_CREATE_UNLOCK(inp);
12431                 create_lock_applied = 0;
12432         }
12433         if (asoc->stream_reset_outstanding) {
12434                 /*
12435                  * Can't queue any data while stream reset is underway.
12436                  */
12437                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12438                 error = EAGAIN;
12439                 goto out_unlocked;
12440         }
12441         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12442             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12443                 queue_only = 1;
12444         }
12445         /* we are now done with all control */
12446         if (control) {
12447                 sctp_m_freem(control);
12448                 control = NULL;
12449         }
12450         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12451             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12452             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12453             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12454                 if (srcv->sinfo_flags & SCTP_ABORT) {
12455                         ;
12456                 } else {
12457                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12458                         error = ECONNRESET;
12459                         goto out_unlocked;
12460                 }
12461         }
12462         /* Ok, we will attempt a msgsnd :> */
12463         if (p) {
12464                 p->td_ru.ru_msgsnd++;
12465         }
12466         /* Are we aborting? */
12467         if (srcv->sinfo_flags & SCTP_ABORT) {
12468                 struct mbuf *mm;
12469                 int tot_demand, tot_out = 0, max_out;
12470
12471                 SCTP_STAT_INCR(sctps_sends_with_abort);
12472                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12473                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12474                         /* It has to be up before we abort */
12475                         /* how big is the user initiated abort? */
12476                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12477                         error = EINVAL;
12478                         goto out;
12479                 }
12480                 if (hold_tcblock) {
12481                         SCTP_TCB_UNLOCK(stcb);
12482                         hold_tcblock = 0;
12483                 }
12484                 if (top) {
12485                         struct mbuf *cntm = NULL;
12486
12487                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12488                         if (sndlen != 0) {
12489                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12490                                         tot_out += SCTP_BUF_LEN(cntm);
12491                                 }
12492                         }
12493                 } else {
12494                         /* Must fit in a MTU */
12495                         tot_out = sndlen;
12496                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12497                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12498                                 /* To big */
12499                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12500                                 error = EMSGSIZE;
12501                                 goto out;
12502                         }
12503                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12504                 }
12505                 if (mm == NULL) {
12506                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12507                         error = ENOMEM;
12508                         goto out;
12509                 }
12510                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12511                 max_out -= sizeof(struct sctp_abort_msg);
12512                 if (tot_out > max_out) {
12513                         tot_out = max_out;
12514                 }
12515                 if (mm) {
12516                         struct sctp_paramhdr *ph;
12517
12518                         /* now move forward the data pointer */
12519                         ph = mtod(mm, struct sctp_paramhdr *);
12520                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12521                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12522                         ph++;
12523                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12524                         if (top == NULL) {
12525                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12526                                 if (error) {
12527                                         /*-
12528                                          * Here if we can't get his data we
12529                                          * still abort we just don't get to
12530                                          * send the users note :-0
12531                                          */
12532                                         sctp_m_freem(mm);
12533                                         mm = NULL;
12534                                 }
12535                         } else {
12536                                 if (sndlen != 0) {
12537                                         SCTP_BUF_NEXT(mm) = top;
12538                                 }
12539                         }
12540                 }
12541                 if (hold_tcblock == 0) {
12542                         SCTP_TCB_LOCK(stcb);
12543                 }
12544                 atomic_add_int(&stcb->asoc.refcnt, -1);
12545                 free_cnt_applied = 0;
12546                 /* release this lock, otherwise we hang on ourselves */
12547                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12548                 /* now relock the stcb so everything is sane */
12549                 hold_tcblock = 0;
12550                 stcb = NULL;
12551                 /*
12552                  * In this case top is already chained to mm avoid double
12553                  * free, since we free it below if top != NULL and driver
12554                  * would free it after sending the packet out
12555                  */
12556                 if (sndlen != 0) {
12557                         top = NULL;
12558                 }
12559                 goto out_unlocked;
12560         }
12561         /* Calculate the maximum we can send */
12562         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12563         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12564                 if (non_blocking) {
12565                         /* we already checked for non-blocking above. */
12566                         max_len = sndlen;
12567                 } else {
12568                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12569                 }
12570         } else {
12571                 max_len = 0;
12572         }
12573         if (hold_tcblock) {
12574                 SCTP_TCB_UNLOCK(stcb);
12575                 hold_tcblock = 0;
12576         }
12577         /* Is the stream no. valid? */
12578         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12579                 /* Invalid stream number */
12580                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12581                 error = EINVAL;
12582                 goto out_unlocked;
12583         }
12584         if (asoc->strmout == NULL) {
12585                 /* huh? software error */
12586                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12587                 error = EFAULT;
12588                 goto out_unlocked;
12589         }
12590         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12591         if ((user_marks_eor == 0) &&
12592             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12593                 /* It will NEVER fit */
12594                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12595                 error = EMSGSIZE;
12596                 goto out_unlocked;
12597         }
12598         if ((uio == NULL) && user_marks_eor) {
12599                 /*-
12600                  * We do not support eeor mode for
12601                  * sending with mbuf chains (like sendfile).
12602                  */
12603                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12604                 error = EINVAL;
12605                 goto out_unlocked;
12606         }
12607         if (user_marks_eor) {
12608                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12609         } else {
12610                 /*-
12611                  * For non-eeor the whole message must fit in
12612                  * the socket send buffer.
12613                  */
12614                 local_add_more = sndlen;
12615         }
12616         len = 0;
12617         if (non_blocking) {
12618                 goto skip_preblock;
12619         }
12620         if (((max_len <= local_add_more) &&
12621             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12622             (max_len == 0) ||
12623             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12624                 /* No room right now ! */
12625                 SOCKBUF_LOCK(&so->so_snd);
12626                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12627                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12628                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12629                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12630                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12631                             inqueue_bytes,
12632                             local_add_more,
12633                             stcb->asoc.stream_queue_cnt,
12634                             stcb->asoc.chunks_on_out_queue,
12635                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12636                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12637                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12638                         }
12639                         be.error = 0;
12640                         stcb->block_entry = &be;
12641                         error = sbwait(&so->so_snd);
12642                         stcb->block_entry = NULL;
12643                         if (error || so->so_error || be.error) {
12644                                 if (error == 0) {
12645                                         if (so->so_error)
12646                                                 error = so->so_error;
12647                                         if (be.error) {
12648                                                 error = be.error;
12649                                         }
12650                                 }
12651                                 SOCKBUF_UNLOCK(&so->so_snd);
12652                                 goto out_unlocked;
12653                         }
12654                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12655                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12656                                     asoc, stcb->asoc.total_output_queue_size);
12657                         }
12658                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12659                                 goto out_unlocked;
12660                         }
12661                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12662                 }
12663                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12664                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12665                 } else {
12666                         max_len = 0;
12667                 }
12668                 SOCKBUF_UNLOCK(&so->so_snd);
12669         }
12670 skip_preblock:
12671         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12672                 goto out_unlocked;
12673         }
12674         /*
12675          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12676          * case NOTE: uio will be null when top/mbuf is passed
12677          */
12678         if (sndlen == 0) {
12679                 if (srcv->sinfo_flags & SCTP_EOF) {
12680                         got_all_of_the_send = 1;
12681                         goto dataless_eof;
12682                 } else {
12683                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12684                         error = EINVAL;
12685                         goto out;
12686                 }
12687         }
12688         if (top == NULL) {
12689                 struct sctp_stream_queue_pending *sp;
12690                 struct sctp_stream_out *strm;
12691                 uint32_t sndout;
12692
12693                 SCTP_TCB_SEND_LOCK(stcb);
12694                 if ((asoc->stream_locked) &&
12695                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12696                         SCTP_TCB_SEND_UNLOCK(stcb);
12697                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12698                         error = EINVAL;
12699                         goto out;
12700                 }
12701                 SCTP_TCB_SEND_UNLOCK(stcb);
12702
12703                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12704                 if (strm->last_msg_incomplete == 0) {
12705         do_a_copy_in:
12706                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12707                         if ((sp == NULL) || (error)) {
12708                                 goto out;
12709                         }
12710                         SCTP_TCB_SEND_LOCK(stcb);
12711                         if (sp->msg_is_complete) {
12712                                 strm->last_msg_incomplete = 0;
12713                                 asoc->stream_locked = 0;
12714                         } else {
12715                                 /*
12716                                  * Just got locked to this guy in case of an
12717                                  * interrupt.
12718                                  */
12719                                 strm->last_msg_incomplete = 1;
12720                                 asoc->stream_locked = 1;
12721                                 asoc->stream_locked_on = srcv->sinfo_stream;
12722                                 sp->sender_all_done = 0;
12723                         }
12724                         sctp_snd_sb_alloc(stcb, sp->length);
12725                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12726                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
12727                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12728                         }
12729                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12730                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12731                         SCTP_TCB_SEND_UNLOCK(stcb);
12732                 } else {
12733                         SCTP_TCB_SEND_LOCK(stcb);
12734                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12735                         SCTP_TCB_SEND_UNLOCK(stcb);
12736                         if (sp == NULL) {
12737                                 /* ???? Huh ??? last msg is gone */
12738 #ifdef INVARIANTS
12739                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12740 #else
12741                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12742                                 strm->last_msg_incomplete = 0;
12743 #endif
12744                                 goto do_a_copy_in;
12745
12746                         }
12747                 }
12748                 while (uio->uio_resid > 0) {
12749                         /* How much room do we have? */
12750                         struct mbuf *new_tail, *mm;
12751
12752                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12753                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12754                         else
12755                                 max_len = 0;
12756
12757                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12758                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12759                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12760                                 sndout = 0;
12761                                 new_tail = NULL;
12762                                 if (hold_tcblock) {
12763                                         SCTP_TCB_UNLOCK(stcb);
12764                                         hold_tcblock = 0;
12765                                 }
12766                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12767                                 if ((mm == NULL) || error) {
12768                                         if (mm) {
12769                                                 sctp_m_freem(mm);
12770                                         }
12771                                         goto out;
12772                                 }
12773                                 /* Update the mbuf and count */
12774                                 SCTP_TCB_SEND_LOCK(stcb);
12775                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12776                                         /*
12777                                          * we need to get out. Peer probably
12778                                          * aborted.
12779                                          */
12780                                         sctp_m_freem(mm);
12781                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12782                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12783                                                 error = ECONNRESET;
12784                                         }
12785                                         SCTP_TCB_SEND_UNLOCK(stcb);
12786                                         goto out;
12787                                 }
12788                                 if (sp->tail_mbuf) {
12789                                         /* tack it to the end */
12790                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12791                                         sp->tail_mbuf = new_tail;
12792                                 } else {
12793                                         /* A stolen mbuf */
12794                                         sp->data = mm;
12795                                         sp->tail_mbuf = new_tail;
12796                                 }
12797                                 sctp_snd_sb_alloc(stcb, sndout);
12798                                 atomic_add_int(&sp->length, sndout);
12799                                 len += sndout;
12800
12801                                 /* Did we reach EOR? */
12802                                 if ((uio->uio_resid == 0) &&
12803                                     ((user_marks_eor == 0) ||
12804                                     (srcv->sinfo_flags & SCTP_EOF) ||
12805                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12806                                         sp->msg_is_complete = 1;
12807                                 } else {
12808                                         sp->msg_is_complete = 0;
12809                                 }
12810                                 SCTP_TCB_SEND_UNLOCK(stcb);
12811                         }
12812                         if (uio->uio_resid == 0) {
12813                                 /* got it all? */
12814                                 continue;
12815                         }
12816                         /* PR-SCTP? */
12817                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12818                                 /*
12819                                  * This is ugly but we must assure locking
12820                                  * order
12821                                  */
12822                                 if (hold_tcblock == 0) {
12823                                         SCTP_TCB_LOCK(stcb);
12824                                         hold_tcblock = 1;
12825                                 }
12826                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12827                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12828                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12829                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12830                                 else
12831                                         max_len = 0;
12832                                 if (max_len > 0) {
12833                                         continue;
12834                                 }
12835                                 SCTP_TCB_UNLOCK(stcb);
12836                                 hold_tcblock = 0;
12837                         }
12838                         /* wait for space now */
12839                         if (non_blocking) {
12840                                 /* Non-blocking io in place out */
12841                                 goto skip_out_eof;
12842                         }
12843                         /* What about the INIT, send it maybe */
12844                         if (queue_only_for_init) {
12845                                 if (hold_tcblock == 0) {
12846                                         SCTP_TCB_LOCK(stcb);
12847                                         hold_tcblock = 1;
12848                                 }
12849                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12850                                         /* a collision took us forward? */
12851                                         queue_only = 0;
12852                                 } else {
12853                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12854                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12855                                         queue_only = 1;
12856                                 }
12857                         }
12858                         if ((net->flight_size > net->cwnd) &&
12859                             (asoc->sctp_cmt_on_off == 0)) {
12860                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12861                                 queue_only = 1;
12862                         } else if (asoc->ifp_had_enobuf) {
12863                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12864                                 if (net->flight_size > (2 * net->mtu)) {
12865                                         queue_only = 1;
12866                                 }
12867                                 asoc->ifp_had_enobuf = 0;
12868                         }
12869                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12870                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12871                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12872                             (stcb->asoc.total_flight > 0) &&
12873                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12874                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12875
12876                                 /*-
12877                                  * Ok, Nagle is set on and we have data outstanding.
12878                                  * Don't send anything and let SACKs drive out the
12879                                  * data unless wen have a "full" segment to send.
12880                                  */
12881                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12882                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12883                                 }
12884                                 SCTP_STAT_INCR(sctps_naglequeued);
12885                                 nagle_applies = 1;
12886                         } else {
12887                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12888                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12889                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12890                                 }
12891                                 SCTP_STAT_INCR(sctps_naglesent);
12892                                 nagle_applies = 0;
12893                         }
12894                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12895
12896                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12897                                     nagle_applies, un_sent);
12898                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12899                                     stcb->asoc.total_flight,
12900                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12901                         }
12902                         if (queue_only_for_init)
12903                                 queue_only_for_init = 0;
12904                         if ((queue_only == 0) && (nagle_applies == 0)) {
12905                                 /*-
12906                                  * need to start chunk output
12907                                  * before blocking.. note that if
12908                                  * a lock is already applied, then
12909                                  * the input via the net is happening
12910                                  * and I don't need to start output :-D
12911                                  */
12912                                 if (hold_tcblock == 0) {
12913                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12914                                                 hold_tcblock = 1;
12915                                                 sctp_chunk_output(inp,
12916                                                     stcb,
12917                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12918                                         }
12919                                 } else {
12920                                         sctp_chunk_output(inp,
12921                                             stcb,
12922                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12923                                 }
12924                                 if (hold_tcblock == 1) {
12925                                         SCTP_TCB_UNLOCK(stcb);
12926                                         hold_tcblock = 0;
12927                                 }
12928                         }
12929                         SOCKBUF_LOCK(&so->so_snd);
12930                         /*-
12931                          * This is a bit strange, but I think it will
12932                          * work. The total_output_queue_size is locked and
12933                          * protected by the TCB_LOCK, which we just released.
12934                          * There is a race that can occur between releasing it
12935                          * above, and me getting the socket lock, where sacks
12936                          * come in but we have not put the SB_WAIT on the
12937                          * so_snd buffer to get the wakeup. After the LOCK
12938                          * is applied the sack_processing will also need to
12939                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12940                          * once we have the socket buffer lock if we recheck the
12941                          * size we KNOW we will get to sleep safely with the
12942                          * wakeup flag in place.
12943                          */
12944                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12945                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
12946                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12947                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12948                                             asoc, uio->uio_resid);
12949                                 }
12950                                 be.error = 0;
12951                                 stcb->block_entry = &be;
12952                                 error = sbwait(&so->so_snd);
12953                                 stcb->block_entry = NULL;
12954
12955                                 if (error || so->so_error || be.error) {
12956                                         if (error == 0) {
12957                                                 if (so->so_error)
12958                                                         error = so->so_error;
12959                                                 if (be.error) {
12960                                                         error = be.error;
12961                                                 }
12962                                         }
12963                                         SOCKBUF_UNLOCK(&so->so_snd);
12964                                         goto out_unlocked;
12965                                 }
12966                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12967                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12968                                             asoc, stcb->asoc.total_output_queue_size);
12969                                 }
12970                         }
12971                         SOCKBUF_UNLOCK(&so->so_snd);
12972                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12973                                 goto out_unlocked;
12974                         }
12975                 }
12976                 SCTP_TCB_SEND_LOCK(stcb);
12977                 if (sp) {
12978                         if (sp->msg_is_complete == 0) {
12979                                 strm->last_msg_incomplete = 1;
12980                                 asoc->stream_locked = 1;
12981                                 asoc->stream_locked_on = srcv->sinfo_stream;
12982                         } else {
12983                                 sp->sender_all_done = 1;
12984                                 strm->last_msg_incomplete = 0;
12985                                 asoc->stream_locked = 0;
12986                         }
12987                 } else {
12988                         SCTP_PRINTF("Huh no sp TSNH?\n");
12989                         strm->last_msg_incomplete = 0;
12990                         asoc->stream_locked = 0;
12991                 }
12992                 SCTP_TCB_SEND_UNLOCK(stcb);
12993                 if (uio->uio_resid == 0) {
12994                         got_all_of_the_send = 1;
12995                 }
12996         } else {
12997                 /* We send in a 0, since we do NOT have any locks */
12998                 error = sctp_msg_append(stcb, net, top, srcv, 0);
12999                 top = NULL;
13000                 if (srcv->sinfo_flags & SCTP_EOF) {
13001                         /*
13002                          * This should only happen for Panda for the mbuf
13003                          * send case, which does NOT yet support EEOR mode.
13004                          * Thus, we can just set this flag to do the proper
13005                          * EOF handling.
13006                          */
13007                         got_all_of_the_send = 1;
13008                 }
13009         }
13010         if (error) {
13011                 goto out;
13012         }
13013 dataless_eof:
13014         /* EOF thing ? */
13015         if ((srcv->sinfo_flags & SCTP_EOF) &&
13016             (got_all_of_the_send == 1)) {
13017                 int cnt;
13018
13019                 SCTP_STAT_INCR(sctps_sends_with_eof);
13020                 error = 0;
13021                 if (hold_tcblock == 0) {
13022                         SCTP_TCB_LOCK(stcb);
13023                         hold_tcblock = 1;
13024                 }
13025                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13026                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13027                     TAILQ_EMPTY(&asoc->sent_queue) &&
13028                     (cnt == 0)) {
13029                         if (asoc->locked_on_sending) {
13030                                 goto abort_anyway;
13031                         }
13032                         /* there is nothing queued to send, so I'm done... */
13033                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13034                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13035                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13036                                 struct sctp_nets *netp;
13037
13038                                 /* only send SHUTDOWN the first time through */
13039                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13040                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13041                                 }
13042                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13043                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13044                                 sctp_stop_timers_for_shutdown(stcb);
13045                                 if (stcb->asoc.alternate) {
13046                                         netp = stcb->asoc.alternate;
13047                                 } else {
13048                                         netp = stcb->asoc.primary_destination;
13049                                 }
13050                                 sctp_send_shutdown(stcb, netp);
13051                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13052                                     netp);
13053                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13054                                     asoc->primary_destination);
13055                         }
13056                 } else {
13057                         /*-
13058                          * we still got (or just got) data to send, so set
13059                          * SHUTDOWN_PENDING
13060                          */
13061                         /*-
13062                          * XXX sockets draft says that SCTP_EOF should be
13063                          * sent with no data.  currently, we will allow user
13064                          * data to be sent first and move to
13065                          * SHUTDOWN-PENDING
13066                          */
13067                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13068                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13069                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13070                                 if (hold_tcblock == 0) {
13071                                         SCTP_TCB_LOCK(stcb);
13072                                         hold_tcblock = 1;
13073                                 }
13074                                 if (asoc->locked_on_sending) {
13075                                         /* Locked to send out the data */
13076                                         struct sctp_stream_queue_pending *sp;
13077
13078                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13079                                         if (sp) {
13080                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13081                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13082                                         }
13083                                 }
13084                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13085                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13086                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13087                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13088                         abort_anyway:
13089                                         if (free_cnt_applied) {
13090                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13091                                                 free_cnt_applied = 0;
13092                                         }
13093                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13094                                             NULL, SCTP_SO_LOCKED);
13095                                         /*
13096                                          * now relock the stcb so everything
13097                                          * is sane
13098                                          */
13099                                         hold_tcblock = 0;
13100                                         stcb = NULL;
13101                                         goto out;
13102                                 }
13103                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13104                                     asoc->primary_destination);
13105                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13106                         }
13107                 }
13108         }
13109 skip_out_eof:
13110         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13111                 some_on_control = 1;
13112         }
13113         if (queue_only_for_init) {
13114                 if (hold_tcblock == 0) {
13115                         SCTP_TCB_LOCK(stcb);
13116                         hold_tcblock = 1;
13117                 }
13118                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13119                         /* a collision took us forward? */
13120                         queue_only = 0;
13121                 } else {
13122                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13123                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13124                         queue_only = 1;
13125                 }
13126         }
13127         if ((net->flight_size > net->cwnd) &&
13128             (stcb->asoc.sctp_cmt_on_off == 0)) {
13129                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13130                 queue_only = 1;
13131         } else if (asoc->ifp_had_enobuf) {
13132                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13133                 if (net->flight_size > (2 * net->mtu)) {
13134                         queue_only = 1;
13135                 }
13136                 asoc->ifp_had_enobuf = 0;
13137         }
13138         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13139             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13140         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13141             (stcb->asoc.total_flight > 0) &&
13142             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13143             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13144                 /*-
13145                  * Ok, Nagle is set on and we have data outstanding.
13146                  * Don't send anything and let SACKs drive out the
13147                  * data unless wen have a "full" segment to send.
13148                  */
13149                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13150                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13151                 }
13152                 SCTP_STAT_INCR(sctps_naglequeued);
13153                 nagle_applies = 1;
13154         } else {
13155                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13156                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13157                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13158                 }
13159                 SCTP_STAT_INCR(sctps_naglesent);
13160                 nagle_applies = 0;
13161         }
13162         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13163                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13164                     nagle_applies, un_sent);
13165                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13166                     stcb->asoc.total_flight,
13167                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13168         }
13169         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13170                 /* we can attempt to send too. */
13171                 if (hold_tcblock == 0) {
13172                         /*
13173                          * If there is activity recv'ing sacks no need to
13174                          * send
13175                          */
13176                         if (SCTP_TCB_TRYLOCK(stcb)) {
13177                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13178                                 hold_tcblock = 1;
13179                         }
13180                 } else {
13181                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13182                 }
13183         } else if ((queue_only == 0) &&
13184                     (stcb->asoc.peers_rwnd == 0) &&
13185             (stcb->asoc.total_flight == 0)) {
13186                 /* We get to have a probe outstanding */
13187                 if (hold_tcblock == 0) {
13188                         hold_tcblock = 1;
13189                         SCTP_TCB_LOCK(stcb);
13190                 }
13191                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13192         } else if (some_on_control) {
13193                 int num_out, reason, frag_point;
13194
13195                 /* Here we do control only */
13196                 if (hold_tcblock == 0) {
13197                         hold_tcblock = 1;
13198                         SCTP_TCB_LOCK(stcb);
13199                 }
13200                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13201                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13202                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13203         }
13204         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13205             queue_only, stcb->asoc.peers_rwnd, un_sent,
13206             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13207             stcb->asoc.total_output_queue_size, error);
13208
13209 out:
13210 out_unlocked:
13211
13212         if (local_soresv && stcb) {
13213                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13214         }
13215         if (create_lock_applied) {
13216                 SCTP_ASOC_CREATE_UNLOCK(inp);
13217         }
13218         if ((stcb) && hold_tcblock) {
13219                 SCTP_TCB_UNLOCK(stcb);
13220         }
13221         if (stcb && free_cnt_applied) {
13222                 atomic_add_int(&stcb->asoc.refcnt, -1);
13223         }
13224 #ifdef INVARIANTS
13225         if (stcb) {
13226                 if (mtx_owned(&stcb->tcb_mtx)) {
13227                         panic("Leaving with tcb mtx owned?");
13228                 }
13229                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13230                         panic("Leaving with tcb send mtx owned?");
13231                 }
13232         }
13233 #endif
13234 #ifdef INVARIANTS
13235         if (inp) {
13236                 sctp_validate_no_locks(inp);
13237         } else {
13238                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13239         }
13240 #endif
13241         if (top) {
13242                 sctp_m_freem(top);
13243         }
13244         if (control) {
13245                 sctp_m_freem(control);
13246         }
13247         return (error);
13248 }
13249
13250
13251 /*
13252  * generate an AUTHentication chunk, if required
13253  */
13254 struct mbuf *
13255 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13256     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13257     struct sctp_tcb *stcb, uint8_t chunk)
13258 {
13259         struct mbuf *m_auth;
13260         struct sctp_auth_chunk *auth;
13261         int chunk_len;
13262         struct mbuf *cn;
13263
13264         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13265             (stcb == NULL))
13266                 return (m);
13267
13268         /* sysctl disabled auth? */
13269         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13270                 return (m);
13271
13272         /* peer doesn't do auth... */
13273         if (!stcb->asoc.peer_supports_auth) {
13274                 return (m);
13275         }
13276         /* does the requested chunk require auth? */
13277         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13278                 return (m);
13279         }
13280         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13281         if (m_auth == NULL) {
13282                 /* no mbuf's */
13283                 return (m);
13284         }
13285         /* reserve some space if this will be the first mbuf */
13286         if (m == NULL)
13287                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13288         /* fill in the AUTH chunk details */
13289         auth = mtod(m_auth, struct sctp_auth_chunk *);
13290         bzero(auth, sizeof(*auth));
13291         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13292         auth->ch.chunk_flags = 0;
13293         chunk_len = sizeof(*auth) +
13294             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13295         auth->ch.chunk_length = htons(chunk_len);
13296         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13297         /* key id and hmac digest will be computed and filled in upon send */
13298
13299         /* save the offset where the auth was inserted into the chain */
13300         *offset = 0;
13301         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13302                 *offset += SCTP_BUF_LEN(cn);
13303         }
13304
13305         /* update length and return pointer to the auth chunk */
13306         SCTP_BUF_LEN(m_auth) = chunk_len;
13307         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13308         if (auth_ret != NULL)
13309                 *auth_ret = auth;
13310
13311         return (m);
13312 }
13313
13314 #ifdef INET6
13315 int
13316 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13317 {
13318         struct nd_prefix *pfx = NULL;
13319         struct nd_pfxrouter *pfxrtr = NULL;
13320         struct sockaddr_in6 gw6;
13321
13322         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13323                 return (0);
13324
13325         /* get prefix entry of address */
13326         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13327                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13328                         continue;
13329                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13330                     &src6->sin6_addr, &pfx->ndpr_mask))
13331                         break;
13332         }
13333         /* no prefix entry in the prefix list */
13334         if (pfx == NULL) {
13335                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13336                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13337                 return (0);
13338         }
13339         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13340         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13341
13342         /* search installed gateway from prefix entry */
13343         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13344                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13345                 gw6.sin6_family = AF_INET6;
13346                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13347                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13348                     sizeof(struct in6_addr));
13349                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13350                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13351                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13352                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13353                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13354                     ro->ro_rt->rt_gateway)) {
13355                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13356                         return (1);
13357                 }
13358         }
13359         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13360         return (0);
13361 }
13362
13363 #endif
13364
13365 int
13366 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13367 {
13368 #ifdef INET
13369         struct sockaddr_in *sin, *mask;
13370         struct ifaddr *ifa;
13371         struct in_addr srcnetaddr, gwnetaddr;
13372
13373         if (ro == NULL || ro->ro_rt == NULL ||
13374             sifa->address.sa.sa_family != AF_INET) {
13375                 return (0);
13376         }
13377         ifa = (struct ifaddr *)sifa->ifa;
13378         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13379         sin = (struct sockaddr_in *)&sifa->address.sin;
13380         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13381         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13382         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13383         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13384
13385         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13386         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13387         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13388         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13389         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13390         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13391                 return (1);
13392         }
13393 #endif
13394         return (0);
13395 }