sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #include <netinet/udp.h>
  54 #include <netinet/udp_var.h>
  55 #include <machine/in_cksum.h>
  56
  57
  58
  59 #define SCTP_MAX_GAPS_INARRAY 4
  60 struct sack_track {
  61         uint8_t right_edge;     /* mergable on the right edge */
  62         uint8_t left_edge;      /* mergable on the left edge */
  63         uint8_t num_entries;
  64         uint8_t spare;
  65         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  66 };
  67
  68 struct sack_track sack_array[256] = {
  69         {0, 0, 0, 0,            /* 0x00 */
  70                 {{0, 0},
  71                 {0, 0},
  72                 {0, 0},
  73                 {0, 0}
  74                 }
  75         },
  76         {1, 0, 1, 0,            /* 0x01 */
  77                 {{0, 0},
  78                 {0, 0},
  79                 {0, 0},
  80                 {0, 0}
  81                 }
  82         },
  83         {0, 0, 1, 0,            /* 0x02 */
  84                 {{1, 1},
  85                 {0, 0},
  86                 {0, 0},
  87                 {0, 0}
  88                 }
  89         },
  90         {1, 0, 1, 0,            /* 0x03 */
  91                 {{0, 1},
  92                 {0, 0},
  93                 {0, 0},
  94                 {0, 0}
  95                 }
  96         },
  97         {0, 0, 1, 0,            /* 0x04 */
  98                 {{2, 2},
  99                 {0, 0},
 100                 {0, 0},
 101                 {0, 0}
 102                 }
 103         },
 104         {1, 0, 2, 0,            /* 0x05 */
 105                 {{0, 0},
 106                 {2, 2},
 107                 {0, 0},
 108                 {0, 0}
 109                 }
 110         },
 111         {0, 0, 1, 0,            /* 0x06 */
 112                 {{1, 2},
 113                 {0, 0},
 114                 {0, 0},
 115                 {0, 0}
 116                 }
 117         },
 118         {1, 0, 1, 0,            /* 0x07 */
 119                 {{0, 2},
 120                 {0, 0},
 121                 {0, 0},
 122                 {0, 0}
 123                 }
 124         },
 125         {0, 0, 1, 0,            /* 0x08 */
 126                 {{3, 3},
 127                 {0, 0},
 128                 {0, 0},
 129                 {0, 0}
 130                 }
 131         },
 132         {1, 0, 2, 0,            /* 0x09 */
 133                 {{0, 0},
 134                 {3, 3},
 135                 {0, 0},
 136                 {0, 0}
 137                 }
 138         },
 139         {0, 0, 2, 0,            /* 0x0a */
 140                 {{1, 1},
 141                 {3, 3},
 142                 {0, 0},
 143                 {0, 0}
 144                 }
 145         },
 146         {1, 0, 2, 0,            /* 0x0b */
 147                 {{0, 1},
 148                 {3, 3},
 149                 {0, 0},
 150                 {0, 0}
 151                 }
 152         },
 153         {0, 0, 1, 0,            /* 0x0c */
 154                 {{2, 3},
 155                 {0, 0},
 156                 {0, 0},
 157                 {0, 0}
 158                 }
 159         },
 160         {1, 0, 2, 0,            /* 0x0d */
 161                 {{0, 0},
 162                 {2, 3},
 163                 {0, 0},
 164                 {0, 0}
 165                 }
 166         },
 167         {0, 0, 1, 0,            /* 0x0e */
 168                 {{1, 3},
 169                 {0, 0},
 170                 {0, 0},
 171                 {0, 0}
 172                 }
 173         },
 174         {1, 0, 1, 0,            /* 0x0f */
 175                 {{0, 3},
 176                 {0, 0},
 177                 {0, 0},
 178                 {0, 0}
 179                 }
 180         },
 181         {0, 0, 1, 0,            /* 0x10 */
 182                 {{4, 4},
 183                 {0, 0},
 184                 {0, 0},
 185                 {0, 0}
 186                 }
 187         },
 188         {1, 0, 2, 0,            /* 0x11 */
 189                 {{0, 0},
 190                 {4, 4},
 191                 {0, 0},
 192                 {0, 0}
 193                 }
 194         },
 195         {0, 0, 2, 0,            /* 0x12 */
 196                 {{1, 1},
 197                 {4, 4},
 198                 {0, 0},
 199                 {0, 0}
 200                 }
 201         },
 202         {1, 0, 2, 0,            /* 0x13 */
 203                 {{0, 1},
 204                 {4, 4},
 205                 {0, 0},
 206                 {0, 0}
 207                 }
 208         },
 209         {0, 0, 2, 0,            /* 0x14 */
 210                 {{2, 2},
 211                 {4, 4},
 212                 {0, 0},
 213                 {0, 0}
 214                 }
 215         },
 216         {1, 0, 3, 0,            /* 0x15 */
 217                 {{0, 0},
 218                 {2, 2},
 219                 {4, 4},
 220                 {0, 0}
 221                 }
 222         },
 223         {0, 0, 2, 0,            /* 0x16 */
 224                 {{1, 2},
 225                 {4, 4},
 226                 {0, 0},
 227                 {0, 0}
 228                 }
 229         },
 230         {1, 0, 2, 0,            /* 0x17 */
 231                 {{0, 2},
 232                 {4, 4},
 233                 {0, 0},
 234                 {0, 0}
 235                 }
 236         },
 237         {0, 0, 1, 0,            /* 0x18 */
 238                 {{3, 4},
 239                 {0, 0},
 240                 {0, 0},
 241                 {0, 0}
 242                 }
 243         },
 244         {1, 0, 2, 0,            /* 0x19 */
 245                 {{0, 0},
 246                 {3, 4},
 247                 {0, 0},
 248                 {0, 0}
 249                 }
 250         },
 251         {0, 0, 2, 0,            /* 0x1a */
 252                 {{1, 1},
 253                 {3, 4},
 254                 {0, 0},
 255                 {0, 0}
 256                 }
 257         },
 258         {1, 0, 2, 0,            /* 0x1b */
 259                 {{0, 1},
 260                 {3, 4},
 261                 {0, 0},
 262                 {0, 0}
 263                 }
 264         },
 265         {0, 0, 1, 0,            /* 0x1c */
 266                 {{2, 4},
 267                 {0, 0},
 268                 {0, 0},
 269                 {0, 0}
 270                 }
 271         },
 272         {1, 0, 2, 0,            /* 0x1d */
 273                 {{0, 0},
 274                 {2, 4},
 275                 {0, 0},
 276                 {0, 0}
 277                 }
 278         },
 279         {0, 0, 1, 0,            /* 0x1e */
 280                 {{1, 4},
 281                 {0, 0},
 282                 {0, 0},
 283                 {0, 0}
 284                 }
 285         },
 286         {1, 0, 1, 0,            /* 0x1f */
 287                 {{0, 4},
 288                 {0, 0},
 289                 {0, 0},
 290                 {0, 0}
 291                 }
 292         },
 293         {0, 0, 1, 0,            /* 0x20 */
 294                 {{5, 5},
 295                 {0, 0},
 296                 {0, 0},
 297                 {0, 0}
 298                 }
 299         },
 300         {1, 0, 2, 0,            /* 0x21 */
 301                 {{0, 0},
 302                 {5, 5},
 303                 {0, 0},
 304                 {0, 0}
 305                 }
 306         },
 307         {0, 0, 2, 0,            /* 0x22 */
 308                 {{1, 1},
 309                 {5, 5},
 310                 {0, 0},
 311                 {0, 0}
 312                 }
 313         },
 314         {1, 0, 2, 0,            /* 0x23 */
 315                 {{0, 1},
 316                 {5, 5},
 317                 {0, 0},
 318                 {0, 0}
 319                 }
 320         },
 321         {0, 0, 2, 0,            /* 0x24 */
 322                 {{2, 2},
 323                 {5, 5},
 324                 {0, 0},
 325                 {0, 0}
 326                 }
 327         },
 328         {1, 0, 3, 0,            /* 0x25 */
 329                 {{0, 0},
 330                 {2, 2},
 331                 {5, 5},
 332                 {0, 0}
 333                 }
 334         },
 335         {0, 0, 2, 0,            /* 0x26 */
 336                 {{1, 2},
 337                 {5, 5},
 338                 {0, 0},
 339                 {0, 0}
 340                 }
 341         },
 342         {1, 0, 2, 0,            /* 0x27 */
 343                 {{0, 2},
 344                 {5, 5},
 345                 {0, 0},
 346                 {0, 0}
 347                 }
 348         },
 349         {0, 0, 2, 0,            /* 0x28 */
 350                 {{3, 3},
 351                 {5, 5},
 352                 {0, 0},
 353                 {0, 0}
 354                 }
 355         },
 356         {1, 0, 3, 0,            /* 0x29 */
 357                 {{0, 0},
 358                 {3, 3},
 359                 {5, 5},
 360                 {0, 0}
 361                 }
 362         },
 363         {0, 0, 3, 0,            /* 0x2a */
 364                 {{1, 1},
 365                 {3, 3},
 366                 {5, 5},
 367                 {0, 0}
 368                 }
 369         },
 370         {1, 0, 3, 0,            /* 0x2b */
 371                 {{0, 1},
 372                 {3, 3},
 373                 {5, 5},
 374                 {0, 0}
 375                 }
 376         },
 377         {0, 0, 2, 0,            /* 0x2c */
 378                 {{2, 3},
 379                 {5, 5},
 380                 {0, 0},
 381                 {0, 0}
 382                 }
 383         },
 384         {1, 0, 3, 0,            /* 0x2d */
 385                 {{0, 0},
 386                 {2, 3},
 387                 {5, 5},
 388                 {0, 0}
 389                 }
 390         },
 391         {0, 0, 2, 0,            /* 0x2e */
 392                 {{1, 3},
 393                 {5, 5},
 394                 {0, 0},
 395                 {0, 0}
 396                 }
 397         },
 398         {1, 0, 2, 0,            /* 0x2f */
 399                 {{0, 3},
 400                 {5, 5},
 401                 {0, 0},
 402                 {0, 0}
 403                 }
 404         },
 405         {0, 0, 1, 0,            /* 0x30 */
 406                 {{4, 5},
 407                 {0, 0},
 408                 {0, 0},
 409                 {0, 0}
 410                 }
 411         },
 412         {1, 0, 2, 0,            /* 0x31 */
 413                 {{0, 0},
 414                 {4, 5},
 415                 {0, 0},
 416                 {0, 0}
 417                 }
 418         },
 419         {0, 0, 2, 0,            /* 0x32 */
 420                 {{1, 1},
 421                 {4, 5},
 422                 {0, 0},
 423                 {0, 0}
 424                 }
 425         },
 426         {1, 0, 2, 0,            /* 0x33 */
 427                 {{0, 1},
 428                 {4, 5},
 429                 {0, 0},
 430                 {0, 0}
 431                 }
 432         },
 433         {0, 0, 2, 0,            /* 0x34 */
 434                 {{2, 2},
 435                 {4, 5},
 436                 {0, 0},
 437                 {0, 0}
 438                 }
 439         },
 440         {1, 0, 3, 0,            /* 0x35 */
 441                 {{0, 0},
 442                 {2, 2},
 443                 {4, 5},
 444                 {0, 0}
 445                 }
 446         },
 447         {0, 0, 2, 0,            /* 0x36 */
 448                 {{1, 2},
 449                 {4, 5},
 450                 {0, 0},
 451                 {0, 0}
 452                 }
 453         },
 454         {1, 0, 2, 0,            /* 0x37 */
 455                 {{0, 2},
 456                 {4, 5},
 457                 {0, 0},
 458                 {0, 0}
 459                 }
 460         },
 461         {0, 0, 1, 0,            /* 0x38 */
 462                 {{3, 5},
 463                 {0, 0},
 464                 {0, 0},
 465                 {0, 0}
 466                 }
 467         },
 468         {1, 0, 2, 0,            /* 0x39 */
 469                 {{0, 0},
 470                 {3, 5},
 471                 {0, 0},
 472                 {0, 0}
 473                 }
 474         },
 475         {0, 0, 2, 0,            /* 0x3a */
 476                 {{1, 1},
 477                 {3, 5},
 478                 {0, 0},
 479                 {0, 0}
 480                 }
 481         },
 482         {1, 0, 2, 0,            /* 0x3b */
 483                 {{0, 1},
 484                 {3, 5},
 485                 {0, 0},
 486                 {0, 0}
 487                 }
 488         },
 489         {0, 0, 1, 0,            /* 0x3c */
 490                 {{2, 5},
 491                 {0, 0},
 492                 {0, 0},
 493                 {0, 0}
 494                 }
 495         },
 496         {1, 0, 2, 0,            /* 0x3d */
 497                 {{0, 0},
 498                 {2, 5},
 499                 {0, 0},
 500                 {0, 0}
 501                 }
 502         },
 503         {0, 0, 1, 0,            /* 0x3e */
 504                 {{1, 5},
 505                 {0, 0},
 506                 {0, 0},
 507                 {0, 0}
 508                 }
 509         },
 510         {1, 0, 1, 0,            /* 0x3f */
 511                 {{0, 5},
 512                 {0, 0},
 513                 {0, 0},
 514                 {0, 0}
 515                 }
 516         },
 517         {0, 0, 1, 0,            /* 0x40 */
 518                 {{6, 6},
 519                 {0, 0},
 520                 {0, 0},
 521                 {0, 0}
 522                 }
 523         },
 524         {1, 0, 2, 0,            /* 0x41 */
 525                 {{0, 0},
 526                 {6, 6},
 527                 {0, 0},
 528                 {0, 0}
 529                 }
 530         },
 531         {0, 0, 2, 0,            /* 0x42 */
 532                 {{1, 1},
 533                 {6, 6},
 534                 {0, 0},
 535                 {0, 0}
 536                 }
 537         },
 538         {1, 0, 2, 0,            /* 0x43 */
 539                 {{0, 1},
 540                 {6, 6},
 541                 {0, 0},
 542                 {0, 0}
 543                 }
 544         },
 545         {0, 0, 2, 0,            /* 0x44 */
 546                 {{2, 2},
 547                 {6, 6},
 548                 {0, 0},
 549                 {0, 0}
 550                 }
 551         },
 552         {1, 0, 3, 0,            /* 0x45 */
 553                 {{0, 0},
 554                 {2, 2},
 555                 {6, 6},
 556                 {0, 0}
 557                 }
 558         },
 559         {0, 0, 2, 0,            /* 0x46 */
 560                 {{1, 2},
 561                 {6, 6},
 562                 {0, 0},
 563                 {0, 0}
 564                 }
 565         },
 566         {1, 0, 2, 0,            /* 0x47 */
 567                 {{0, 2},
 568                 {6, 6},
 569                 {0, 0},
 570                 {0, 0}
 571                 }
 572         },
 573         {0, 0, 2, 0,            /* 0x48 */
 574                 {{3, 3},
 575                 {6, 6},
 576                 {0, 0},
 577                 {0, 0}
 578                 }
 579         },
 580         {1, 0, 3, 0,            /* 0x49 */
 581                 {{0, 0},
 582                 {3, 3},
 583                 {6, 6},
 584                 {0, 0}
 585                 }
 586         },
 587         {0, 0, 3, 0,            /* 0x4a */
 588                 {{1, 1},
 589                 {3, 3},
 590                 {6, 6},
 591                 {0, 0}
 592                 }
 593         },
 594         {1, 0, 3, 0,            /* 0x4b */
 595                 {{0, 1},
 596                 {3, 3},
 597                 {6, 6},
 598                 {0, 0}
 599                 }
 600         },
 601         {0, 0, 2, 0,            /* 0x4c */
 602                 {{2, 3},
 603                 {6, 6},
 604                 {0, 0},
 605                 {0, 0}
 606                 }
 607         },
 608         {1, 0, 3, 0,            /* 0x4d */
 609                 {{0, 0},
 610                 {2, 3},
 611                 {6, 6},
 612                 {0, 0}
 613                 }
 614         },
 615         {0, 0, 2, 0,            /* 0x4e */
 616                 {{1, 3},
 617                 {6, 6},
 618                 {0, 0},
 619                 {0, 0}
 620                 }
 621         },
 622         {1, 0, 2, 0,            /* 0x4f */
 623                 {{0, 3},
 624                 {6, 6},
 625                 {0, 0},
 626                 {0, 0}
 627                 }
 628         },
 629         {0, 0, 2, 0,            /* 0x50 */
 630                 {{4, 4},
 631                 {6, 6},
 632                 {0, 0},
 633                 {0, 0}
 634                 }
 635         },
 636         {1, 0, 3, 0,            /* 0x51 */
 637                 {{0, 0},
 638                 {4, 4},
 639                 {6, 6},
 640                 {0, 0}
 641                 }
 642         },
 643         {0, 0, 3, 0,            /* 0x52 */
 644                 {{1, 1},
 645                 {4, 4},
 646                 {6, 6},
 647                 {0, 0}
 648                 }
 649         },
 650         {1, 0, 3, 0,            /* 0x53 */
 651                 {{0, 1},
 652                 {4, 4},
 653                 {6, 6},
 654                 {0, 0}
 655                 }
 656         },
 657         {0, 0, 3, 0,            /* 0x54 */
 658                 {{2, 2},
 659                 {4, 4},
 660                 {6, 6},
 661                 {0, 0}
 662                 }
 663         },
 664         {1, 0, 4, 0,            /* 0x55 */
 665                 {{0, 0},
 666                 {2, 2},
 667                 {4, 4},
 668                 {6, 6}
 669                 }
 670         },
 671         {0, 0, 3, 0,            /* 0x56 */
 672                 {{1, 2},
 673                 {4, 4},
 674                 {6, 6},
 675                 {0, 0}
 676                 }
 677         },
 678         {1, 0, 3, 0,            /* 0x57 */
 679                 {{0, 2},
 680                 {4, 4},
 681                 {6, 6},
 682                 {0, 0}
 683                 }
 684         },
 685         {0, 0, 2, 0,            /* 0x58 */
 686                 {{3, 4},
 687                 {6, 6},
 688                 {0, 0},
 689                 {0, 0}
 690                 }
 691         },
 692         {1, 0, 3, 0,            /* 0x59 */
 693                 {{0, 0},
 694                 {3, 4},
 695                 {6, 6},
 696                 {0, 0}
 697                 }
 698         },
 699         {0, 0, 3, 0,            /* 0x5a */
 700                 {{1, 1},
 701                 {3, 4},
 702                 {6, 6},
 703                 {0, 0}
 704                 }
 705         },
 706         {1, 0, 3, 0,            /* 0x5b */
 707                 {{0, 1},
 708                 {3, 4},
 709                 {6, 6},
 710                 {0, 0}
 711                 }
 712         },
 713         {0, 0, 2, 0,            /* 0x5c */
 714                 {{2, 4},
 715                 {6, 6},
 716                 {0, 0},
 717                 {0, 0}
 718                 }
 719         },
 720         {1, 0, 3, 0,            /* 0x5d */
 721                 {{0, 0},
 722                 {2, 4},
 723                 {6, 6},
 724                 {0, 0}
 725                 }
 726         },
 727         {0, 0, 2, 0,            /* 0x5e */
 728                 {{1, 4},
 729                 {6, 6},
 730                 {0, 0},
 731                 {0, 0}
 732                 }
 733         },
 734         {1, 0, 2, 0,            /* 0x5f */
 735                 {{0, 4},
 736                 {6, 6},
 737                 {0, 0},
 738                 {0, 0}
 739                 }
 740         },
 741         {0, 0, 1, 0,            /* 0x60 */
 742                 {{5, 6},
 743                 {0, 0},
 744                 {0, 0},
 745                 {0, 0}
 746                 }
 747         },
 748         {1, 0, 2, 0,            /* 0x61 */
 749                 {{0, 0},
 750                 {5, 6},
 751                 {0, 0},
 752                 {0, 0}
 753                 }
 754         },
 755         {0, 0, 2, 0,            /* 0x62 */
 756                 {{1, 1},
 757                 {5, 6},
 758                 {0, 0},
 759                 {0, 0}
 760                 }
 761         },
 762         {1, 0, 2, 0,            /* 0x63 */
 763                 {{0, 1},
 764                 {5, 6},
 765                 {0, 0},
 766                 {0, 0}
 767                 }
 768         },
 769         {0, 0, 2, 0,            /* 0x64 */
 770                 {{2, 2},
 771                 {5, 6},
 772                 {0, 0},
 773                 {0, 0}
 774                 }
 775         },
 776         {1, 0, 3, 0,            /* 0x65 */
 777                 {{0, 0},
 778                 {2, 2},
 779                 {5, 6},
 780                 {0, 0}
 781                 }
 782         },
 783         {0, 0, 2, 0,            /* 0x66 */
 784                 {{1, 2},
 785                 {5, 6},
 786                 {0, 0},
 787                 {0, 0}
 788                 }
 789         },
 790         {1, 0, 2, 0,            /* 0x67 */
 791                 {{0, 2},
 792                 {5, 6},
 793                 {0, 0},
 794                 {0, 0}
 795                 }
 796         },
 797         {0, 0, 2, 0,            /* 0x68 */
 798                 {{3, 3},
 799                 {5, 6},
 800                 {0, 0},
 801                 {0, 0}
 802                 }
 803         },
 804         {1, 0, 3, 0,            /* 0x69 */
 805                 {{0, 0},
 806                 {3, 3},
 807                 {5, 6},
 808                 {0, 0}
 809                 }
 810         },
 811         {0, 0, 3, 0,            /* 0x6a */
 812                 {{1, 1},
 813                 {3, 3},
 814                 {5, 6},
 815                 {0, 0}
 816                 }
 817         },
 818         {1, 0, 3, 0,            /* 0x6b */
 819                 {{0, 1},
 820                 {3, 3},
 821                 {5, 6},
 822                 {0, 0}
 823                 }
 824         },
 825         {0, 0, 2, 0,            /* 0x6c */
 826                 {{2, 3},
 827                 {5, 6},
 828                 {0, 0},
 829                 {0, 0}
 830                 }
 831         },
 832         {1, 0, 3, 0,            /* 0x6d */
 833                 {{0, 0},
 834                 {2, 3},
 835                 {5, 6},
 836                 {0, 0}
 837                 }
 838         },
 839         {0, 0, 2, 0,            /* 0x6e */
 840                 {{1, 3},
 841                 {5, 6},
 842                 {0, 0},
 843                 {0, 0}
 844                 }
 845         },
 846         {1, 0, 2, 0,            /* 0x6f */
 847                 {{0, 3},
 848                 {5, 6},
 849                 {0, 0},
 850                 {0, 0}
 851                 }
 852         },
 853         {0, 0, 1, 0,            /* 0x70 */
 854                 {{4, 6},
 855                 {0, 0},
 856                 {0, 0},
 857                 {0, 0}
 858                 }
 859         },
 860         {1, 0, 2, 0,            /* 0x71 */
 861                 {{0, 0},
 862                 {4, 6},
 863                 {0, 0},
 864                 {0, 0}
 865                 }
 866         },
 867         {0, 0, 2, 0,            /* 0x72 */
 868                 {{1, 1},
 869                 {4, 6},
 870                 {0, 0},
 871                 {0, 0}
 872                 }
 873         },
 874         {1, 0, 2, 0,            /* 0x73 */
 875                 {{0, 1},
 876                 {4, 6},
 877                 {0, 0},
 878                 {0, 0}
 879                 }
 880         },
 881         {0, 0, 2, 0,            /* 0x74 */
 882                 {{2, 2},
 883                 {4, 6},
 884                 {0, 0},
 885                 {0, 0}
 886                 }
 887         },
 888         {1, 0, 3, 0,            /* 0x75 */
 889                 {{0, 0},
 890                 {2, 2},
 891                 {4, 6},
 892                 {0, 0}
 893                 }
 894         },
 895         {0, 0, 2, 0,            /* 0x76 */
 896                 {{1, 2},
 897                 {4, 6},
 898                 {0, 0},
 899                 {0, 0}
 900                 }
 901         },
 902         {1, 0, 2, 0,            /* 0x77 */
 903                 {{0, 2},
 904                 {4, 6},
 905                 {0, 0},
 906                 {0, 0}
 907                 }
 908         },
 909         {0, 0, 1, 0,            /* 0x78 */
 910                 {{3, 6},
 911                 {0, 0},
 912                 {0, 0},
 913                 {0, 0}
 914                 }
 915         },
 916         {1, 0, 2, 0,            /* 0x79 */
 917                 {{0, 0},
 918                 {3, 6},
 919                 {0, 0},
 920                 {0, 0}
 921                 }
 922         },
 923         {0, 0, 2, 0,            /* 0x7a */
 924                 {{1, 1},
 925                 {3, 6},
 926                 {0, 0},
 927                 {0, 0}
 928                 }
 929         },
 930         {1, 0, 2, 0,            /* 0x7b */
 931                 {{0, 1},
 932                 {3, 6},
 933                 {0, 0},
 934                 {0, 0}
 935                 }
 936         },
 937         {0, 0, 1, 0,            /* 0x7c */
 938                 {{2, 6},
 939                 {0, 0},
 940                 {0, 0},
 941                 {0, 0}
 942                 }
 943         },
 944         {1, 0, 2, 0,            /* 0x7d */
 945                 {{0, 0},
 946                 {2, 6},
 947                 {0, 0},
 948                 {0, 0}
 949                 }
 950         },
 951         {0, 0, 1, 0,            /* 0x7e */
 952                 {{1, 6},
 953                 {0, 0},
 954                 {0, 0},
 955                 {0, 0}
 956                 }
 957         },
 958         {1, 0, 1, 0,            /* 0x7f */
 959                 {{0, 6},
 960                 {0, 0},
 961                 {0, 0},
 962                 {0, 0}
 963                 }
 964         },
 965         {0, 1, 1, 0,            /* 0x80 */
 966                 {{7, 7},
 967                 {0, 0},
 968                 {0, 0},
 969                 {0, 0}
 970                 }
 971         },
 972         {1, 1, 2, 0,            /* 0x81 */
 973                 {{0, 0},
 974                 {7, 7},
 975                 {0, 0},
 976                 {0, 0}
 977                 }
 978         },
 979         {0, 1, 2, 0,            /* 0x82 */
 980                 {{1, 1},
 981                 {7, 7},
 982                 {0, 0},
 983                 {0, 0}
 984                 }
 985         },
 986         {1, 1, 2, 0,            /* 0x83 */
 987                 {{0, 1},
 988                 {7, 7},
 989                 {0, 0},
 990                 {0, 0}
 991                 }
 992         },
 993         {0, 1, 2, 0,            /* 0x84 */
 994                 {{2, 2},
 995                 {7, 7},
 996                 {0, 0},
 997                 {0, 0}
 998                 }
 999         },
1000         {1, 1, 3, 0,            /* 0x85 */
1001                 {{0, 0},
1002                 {2, 2},
1003                 {7, 7},
1004                 {0, 0}
1005                 }
1006         },
1007         {0, 1, 2, 0,            /* 0x86 */
1008                 {{1, 2},
1009                 {7, 7},
1010                 {0, 0},
1011                 {0, 0}
1012                 }
1013         },
1014         {1, 1, 2, 0,            /* 0x87 */
1015                 {{0, 2},
1016                 {7, 7},
1017                 {0, 0},
1018                 {0, 0}
1019                 }
1020         },
1021         {0, 1, 2, 0,            /* 0x88 */
1022                 {{3, 3},
1023                 {7, 7},
1024                 {0, 0},
1025                 {0, 0}
1026                 }
1027         },
1028         {1, 1, 3, 0,            /* 0x89 */
1029                 {{0, 0},
1030                 {3, 3},
1031                 {7, 7},
1032                 {0, 0}
1033                 }
1034         },
1035         {0, 1, 3, 0,            /* 0x8a */
1036                 {{1, 1},
1037                 {3, 3},
1038                 {7, 7},
1039                 {0, 0}
1040                 }
1041         },
1042         {1, 1, 3, 0,            /* 0x8b */
1043                 {{0, 1},
1044                 {3, 3},
1045                 {7, 7},
1046                 {0, 0}
1047                 }
1048         },
1049         {0, 1, 2, 0,            /* 0x8c */
1050                 {{2, 3},
1051                 {7, 7},
1052                 {0, 0},
1053                 {0, 0}
1054                 }
1055         },
1056         {1, 1, 3, 0,            /* 0x8d */
1057                 {{0, 0},
1058                 {2, 3},
1059                 {7, 7},
1060                 {0, 0}
1061                 }
1062         },
1063         {0, 1, 2, 0,            /* 0x8e */
1064                 {{1, 3},
1065                 {7, 7},
1066                 {0, 0},
1067                 {0, 0}
1068                 }
1069         },
1070         {1, 1, 2, 0,            /* 0x8f */
1071                 {{0, 3},
1072                 {7, 7},
1073                 {0, 0},
1074                 {0, 0}
1075                 }
1076         },
1077         {0, 1, 2, 0,            /* 0x90 */
1078                 {{4, 4},
1079                 {7, 7},
1080                 {0, 0},
1081                 {0, 0}
1082                 }
1083         },
1084         {1, 1, 3, 0,            /* 0x91 */
1085                 {{0, 0},
1086                 {4, 4},
1087                 {7, 7},
1088                 {0, 0}
1089                 }
1090         },
1091         {0, 1, 3, 0,            /* 0x92 */
1092                 {{1, 1},
1093                 {4, 4},
1094                 {7, 7},
1095                 {0, 0}
1096                 }
1097         },
1098         {1, 1, 3, 0,            /* 0x93 */
1099                 {{0, 1},
1100                 {4, 4},
1101                 {7, 7},
1102                 {0, 0}
1103                 }
1104         },
1105         {0, 1, 3, 0,            /* 0x94 */
1106                 {{2, 2},
1107                 {4, 4},
1108                 {7, 7},
1109                 {0, 0}
1110                 }
1111         },
1112         {1, 1, 4, 0,            /* 0x95 */
1113                 {{0, 0},
1114                 {2, 2},
1115                 {4, 4},
1116                 {7, 7}
1117                 }
1118         },
1119         {0, 1, 3, 0,            /* 0x96 */
1120                 {{1, 2},
1121                 {4, 4},
1122                 {7, 7},
1123                 {0, 0}
1124                 }
1125         },
1126         {1, 1, 3, 0,            /* 0x97 */
1127                 {{0, 2},
1128                 {4, 4},
1129                 {7, 7},
1130                 {0, 0}
1131                 }
1132         },
1133         {0, 1, 2, 0,            /* 0x98 */
1134                 {{3, 4},
1135                 {7, 7},
1136                 {0, 0},
1137                 {0, 0}
1138                 }
1139         },
1140         {1, 1, 3, 0,            /* 0x99 */
1141                 {{0, 0},
1142                 {3, 4},
1143                 {7, 7},
1144                 {0, 0}
1145                 }
1146         },
1147         {0, 1, 3, 0,            /* 0x9a */
1148                 {{1, 1},
1149                 {3, 4},
1150                 {7, 7},
1151                 {0, 0}
1152                 }
1153         },
1154         {1, 1, 3, 0,            /* 0x9b */
1155                 {{0, 1},
1156                 {3, 4},
1157                 {7, 7},
1158                 {0, 0}
1159                 }
1160         },
1161         {0, 1, 2, 0,            /* 0x9c */
1162                 {{2, 4},
1163                 {7, 7},
1164                 {0, 0},
1165                 {0, 0}
1166                 }
1167         },
1168         {1, 1, 3, 0,            /* 0x9d */
1169                 {{0, 0},
1170                 {2, 4},
1171                 {7, 7},
1172                 {0, 0}
1173                 }
1174         },
1175         {0, 1, 2, 0,            /* 0x9e */
1176                 {{1, 4},
1177                 {7, 7},
1178                 {0, 0},
1179                 {0, 0}
1180                 }
1181         },
1182         {1, 1, 2, 0,            /* 0x9f */
1183                 {{0, 4},
1184                 {7, 7},
1185                 {0, 0},
1186                 {0, 0}
1187                 }
1188         },
1189         {0, 1, 2, 0,            /* 0xa0 */
1190                 {{5, 5},
1191                 {7, 7},
1192                 {0, 0},
1193                 {0, 0}
1194                 }
1195         },
1196         {1, 1, 3, 0,            /* 0xa1 */
1197                 {{0, 0},
1198                 {5, 5},
1199                 {7, 7},
1200                 {0, 0}
1201                 }
1202         },
1203         {0, 1, 3, 0,            /* 0xa2 */
1204                 {{1, 1},
1205                 {5, 5},
1206                 {7, 7},
1207                 {0, 0}
1208                 }
1209         },
1210         {1, 1, 3, 0,            /* 0xa3 */
1211                 {{0, 1},
1212                 {5, 5},
1213                 {7, 7},
1214                 {0, 0}
1215                 }
1216         },
1217         {0, 1, 3, 0,            /* 0xa4 */
1218                 {{2, 2},
1219                 {5, 5},
1220                 {7, 7},
1221                 {0, 0}
1222                 }
1223         },
1224         {1, 1, 4, 0,            /* 0xa5 */
1225                 {{0, 0},
1226                 {2, 2},
1227                 {5, 5},
1228                 {7, 7}
1229                 }
1230         },
1231         {0, 1, 3, 0,            /* 0xa6 */
1232                 {{1, 2},
1233                 {5, 5},
1234                 {7, 7},
1235                 {0, 0}
1236                 }
1237         },
1238         {1, 1, 3, 0,            /* 0xa7 */
1239                 {{0, 2},
1240                 {5, 5},
1241                 {7, 7},
1242                 {0, 0}
1243                 }
1244         },
1245         {0, 1, 3, 0,            /* 0xa8 */
1246                 {{3, 3},
1247                 {5, 5},
1248                 {7, 7},
1249                 {0, 0}
1250                 }
1251         },
1252         {1, 1, 4, 0,            /* 0xa9 */
1253                 {{0, 0},
1254                 {3, 3},
1255                 {5, 5},
1256                 {7, 7}
1257                 }
1258         },
1259         {0, 1, 4, 0,            /* 0xaa */
1260                 {{1, 1},
1261                 {3, 3},
1262                 {5, 5},
1263                 {7, 7}
1264                 }
1265         },
1266         {1, 1, 4, 0,            /* 0xab */
1267                 {{0, 1},
1268                 {3, 3},
1269                 {5, 5},
1270                 {7, 7}
1271                 }
1272         },
1273         {0, 1, 3, 0,            /* 0xac */
1274                 {{2, 3},
1275                 {5, 5},
1276                 {7, 7},
1277                 {0, 0}
1278                 }
1279         },
1280         {1, 1, 4, 0,            /* 0xad */
1281                 {{0, 0},
1282                 {2, 3},
1283                 {5, 5},
1284                 {7, 7}
1285                 }
1286         },
1287         {0, 1, 3, 0,            /* 0xae */
1288                 {{1, 3},
1289                 {5, 5},
1290                 {7, 7},
1291                 {0, 0}
1292                 }
1293         },
1294         {1, 1, 3, 0,            /* 0xaf */
1295                 {{0, 3},
1296                 {5, 5},
1297                 {7, 7},
1298                 {0, 0}
1299                 }
1300         },
1301         {0, 1, 2, 0,            /* 0xb0 */
1302                 {{4, 5},
1303                 {7, 7},
1304                 {0, 0},
1305                 {0, 0}
1306                 }
1307         },
1308         {1, 1, 3, 0,            /* 0xb1 */
1309                 {{0, 0},
1310                 {4, 5},
1311                 {7, 7},
1312                 {0, 0}
1313                 }
1314         },
1315         {0, 1, 3, 0,            /* 0xb2 */
1316                 {{1, 1},
1317                 {4, 5},
1318                 {7, 7},
1319                 {0, 0}
1320                 }
1321         },
1322         {1, 1, 3, 0,            /* 0xb3 */
1323                 {{0, 1},
1324                 {4, 5},
1325                 {7, 7},
1326                 {0, 0}
1327                 }
1328         },
1329         {0, 1, 3, 0,            /* 0xb4 */
1330                 {{2, 2},
1331                 {4, 5},
1332                 {7, 7},
1333                 {0, 0}
1334                 }
1335         },
1336         {1, 1, 4, 0,            /* 0xb5 */
1337                 {{0, 0},
1338                 {2, 2},
1339                 {4, 5},
1340                 {7, 7}
1341                 }
1342         },
1343         {0, 1, 3, 0,            /* 0xb6 */
1344                 {{1, 2},
1345                 {4, 5},
1346                 {7, 7},
1347                 {0, 0}
1348                 }
1349         },
1350         {1, 1, 3, 0,            /* 0xb7 */
1351                 {{0, 2},
1352                 {4, 5},
1353                 {7, 7},
1354                 {0, 0}
1355                 }
1356         },
1357         {0, 1, 2, 0,            /* 0xb8 */
1358                 {{3, 5},
1359                 {7, 7},
1360                 {0, 0},
1361                 {0, 0}
1362                 }
1363         },
1364         {1, 1, 3, 0,            /* 0xb9 */
1365                 {{0, 0},
1366                 {3, 5},
1367                 {7, 7},
1368                 {0, 0}
1369                 }
1370         },
1371         {0, 1, 3, 0,            /* 0xba */
1372                 {{1, 1},
1373                 {3, 5},
1374                 {7, 7},
1375                 {0, 0}
1376                 }
1377         },
1378         {1, 1, 3, 0,            /* 0xbb */
1379                 {{0, 1},
1380                 {3, 5},
1381                 {7, 7},
1382                 {0, 0}
1383                 }
1384         },
1385         {0, 1, 2, 0,            /* 0xbc */
1386                 {{2, 5},
1387                 {7, 7},
1388                 {0, 0},
1389                 {0, 0}
1390                 }
1391         },
1392         {1, 1, 3, 0,            /* 0xbd */
1393                 {{0, 0},
1394                 {2, 5},
1395                 {7, 7},
1396                 {0, 0}
1397                 }
1398         },
1399         {0, 1, 2, 0,            /* 0xbe */
1400                 {{1, 5},
1401                 {7, 7},
1402                 {0, 0},
1403                 {0, 0}
1404                 }
1405         },
1406         {1, 1, 2, 0,            /* 0xbf */
1407                 {{0, 5},
1408                 {7, 7},
1409                 {0, 0},
1410                 {0, 0}
1411                 }
1412         },
1413         {0, 1, 1, 0,            /* 0xc0 */
1414                 {{6, 7},
1415                 {0, 0},
1416                 {0, 0},
1417                 {0, 0}
1418                 }
1419         },
1420         {1, 1, 2, 0,            /* 0xc1 */
1421                 {{0, 0},
1422                 {6, 7},
1423                 {0, 0},
1424                 {0, 0}
1425                 }
1426         },
1427         {0, 1, 2, 0,            /* 0xc2 */
1428                 {{1, 1},
1429                 {6, 7},
1430                 {0, 0},
1431                 {0, 0}
1432                 }
1433         },
1434         {1, 1, 2, 0,            /* 0xc3 */
1435                 {{0, 1},
1436                 {6, 7},
1437                 {0, 0},
1438                 {0, 0}
1439                 }
1440         },
1441         {0, 1, 2, 0,            /* 0xc4 */
1442                 {{2, 2},
1443                 {6, 7},
1444                 {0, 0},
1445                 {0, 0}
1446                 }
1447         },
1448         {1, 1, 3, 0,            /* 0xc5 */
1449                 {{0, 0},
1450                 {2, 2},
1451                 {6, 7},
1452                 {0, 0}
1453                 }
1454         },
1455         {0, 1, 2, 0,            /* 0xc6 */
1456                 {{1, 2},
1457                 {6, 7},
1458                 {0, 0},
1459                 {0, 0}
1460                 }
1461         },
1462         {1, 1, 2, 0,            /* 0xc7 */
1463                 {{0, 2},
1464                 {6, 7},
1465                 {0, 0},
1466                 {0, 0}
1467                 }
1468         },
1469         {0, 1, 2, 0,            /* 0xc8 */
1470                 {{3, 3},
1471                 {6, 7},
1472                 {0, 0},
1473                 {0, 0}
1474                 }
1475         },
1476         {1, 1, 3, 0,            /* 0xc9 */
1477                 {{0, 0},
1478                 {3, 3},
1479                 {6, 7},
1480                 {0, 0}
1481                 }
1482         },
1483         {0, 1, 3, 0,            /* 0xca */
1484                 {{1, 1},
1485                 {3, 3},
1486                 {6, 7},
1487                 {0, 0}
1488                 }
1489         },
1490         {1, 1, 3, 0,            /* 0xcb */
1491                 {{0, 1},
1492                 {3, 3},
1493                 {6, 7},
1494                 {0, 0}
1495                 }
1496         },
1497         {0, 1, 2, 0,            /* 0xcc */
1498                 {{2, 3},
1499                 {6, 7},
1500                 {0, 0},
1501                 {0, 0}
1502                 }
1503         },
1504         {1, 1, 3, 0,            /* 0xcd */
1505                 {{0, 0},
1506                 {2, 3},
1507                 {6, 7},
1508                 {0, 0}
1509                 }
1510         },
1511         {0, 1, 2, 0,            /* 0xce */
1512                 {{1, 3},
1513                 {6, 7},
1514                 {0, 0},
1515                 {0, 0}
1516                 }
1517         },
1518         {1, 1, 2, 0,            /* 0xcf */
1519                 {{0, 3},
1520                 {6, 7},
1521                 {0, 0},
1522                 {0, 0}
1523                 }
1524         },
1525         {0, 1, 2, 0,            /* 0xd0 */
1526                 {{4, 4},
1527                 {6, 7},
1528                 {0, 0},
1529                 {0, 0}
1530                 }
1531         },
1532         {1, 1, 3, 0,            /* 0xd1 */
1533                 {{0, 0},
1534                 {4, 4},
1535                 {6, 7},
1536                 {0, 0}
1537                 }
1538         },
1539         {0, 1, 3, 0,            /* 0xd2 */
1540                 {{1, 1},
1541                 {4, 4},
1542                 {6, 7},
1543                 {0, 0}
1544                 }
1545         },
1546         {1, 1, 3, 0,            /* 0xd3 */
1547                 {{0, 1},
1548                 {4, 4},
1549                 {6, 7},
1550                 {0, 0}
1551                 }
1552         },
1553         {0, 1, 3, 0,            /* 0xd4 */
1554                 {{2, 2},
1555                 {4, 4},
1556                 {6, 7},
1557                 {0, 0}
1558                 }
1559         },
1560         {1, 1, 4, 0,            /* 0xd5 */
1561                 {{0, 0},
1562                 {2, 2},
1563                 {4, 4},
1564                 {6, 7}
1565                 }
1566         },
1567         {0, 1, 3, 0,            /* 0xd6 */
1568                 {{1, 2},
1569                 {4, 4},
1570                 {6, 7},
1571                 {0, 0}
1572                 }
1573         },
1574         {1, 1, 3, 0,            /* 0xd7 */
1575                 {{0, 2},
1576                 {4, 4},
1577                 {6, 7},
1578                 {0, 0}
1579                 }
1580         },
1581         {0, 1, 2, 0,            /* 0xd8 */
1582                 {{3, 4},
1583                 {6, 7},
1584                 {0, 0},
1585                 {0, 0}
1586                 }
1587         },
1588         {1, 1, 3, 0,            /* 0xd9 */
1589                 {{0, 0},
1590                 {3, 4},
1591                 {6, 7},
1592                 {0, 0}
1593                 }
1594         },
1595         {0, 1, 3, 0,            /* 0xda */
1596                 {{1, 1},
1597                 {3, 4},
1598                 {6, 7},
1599                 {0, 0}
1600                 }
1601         },
1602         {1, 1, 3, 0,            /* 0xdb */
1603                 {{0, 1},
1604                 {3, 4},
1605                 {6, 7},
1606                 {0, 0}
1607                 }
1608         },
1609         {0, 1, 2, 0,            /* 0xdc */
1610                 {{2, 4},
1611                 {6, 7},
1612                 {0, 0},
1613                 {0, 0}
1614                 }
1615         },
1616         {1, 1, 3, 0,            /* 0xdd */
1617                 {{0, 0},
1618                 {2, 4},
1619                 {6, 7},
1620                 {0, 0}
1621                 }
1622         },
1623         {0, 1, 2, 0,            /* 0xde */
1624                 {{1, 4},
1625                 {6, 7},
1626                 {0, 0},
1627                 {0, 0}
1628                 }
1629         },
1630         {1, 1, 2, 0,            /* 0xdf */
1631                 {{0, 4},
1632                 {6, 7},
1633                 {0, 0},
1634                 {0, 0}
1635                 }
1636         },
1637         {0, 1, 1, 0,            /* 0xe0 */
1638                 {{5, 7},
1639                 {0, 0},
1640                 {0, 0},
1641                 {0, 0}
1642                 }
1643         },
1644         {1, 1, 2, 0,            /* 0xe1 */
1645                 {{0, 0},
1646                 {5, 7},
1647                 {0, 0},
1648                 {0, 0}
1649                 }
1650         },
1651         {0, 1, 2, 0,            /* 0xe2 */
1652                 {{1, 1},
1653                 {5, 7},
1654                 {0, 0},
1655                 {0, 0}
1656                 }
1657         },
1658         {1, 1, 2, 0,            /* 0xe3 */
1659                 {{0, 1},
1660                 {5, 7},
1661                 {0, 0},
1662                 {0, 0}
1663                 }
1664         },
1665         {0, 1, 2, 0,            /* 0xe4 */
1666                 {{2, 2},
1667                 {5, 7},
1668                 {0, 0},
1669                 {0, 0}
1670                 }
1671         },
1672         {1, 1, 3, 0,            /* 0xe5 */
1673                 {{0, 0},
1674                 {2, 2},
1675                 {5, 7},
1676                 {0, 0}
1677                 }
1678         },
1679         {0, 1, 2, 0,            /* 0xe6 */
1680                 {{1, 2},
1681                 {5, 7},
1682                 {0, 0},
1683                 {0, 0}
1684                 }
1685         },
1686         {1, 1, 2, 0,            /* 0xe7 */
1687                 {{0, 2},
1688                 {5, 7},
1689                 {0, 0},
1690                 {0, 0}
1691                 }
1692         },
1693         {0, 1, 2, 0,            /* 0xe8 */
1694                 {{3, 3},
1695                 {5, 7},
1696                 {0, 0},
1697                 {0, 0}
1698                 }
1699         },
1700         {1, 1, 3, 0,            /* 0xe9 */
1701                 {{0, 0},
1702                 {3, 3},
1703                 {5, 7},
1704                 {0, 0}
1705                 }
1706         },
1707         {0, 1, 3, 0,            /* 0xea */
1708                 {{1, 1},
1709                 {3, 3},
1710                 {5, 7},
1711                 {0, 0}
1712                 }
1713         },
1714         {1, 1, 3, 0,            /* 0xeb */
1715                 {{0, 1},
1716                 {3, 3},
1717                 {5, 7},
1718                 {0, 0}
1719                 }
1720         },
1721         {0, 1, 2, 0,            /* 0xec */
1722                 {{2, 3},
1723                 {5, 7},
1724                 {0, 0},
1725                 {0, 0}
1726                 }
1727         },
1728         {1, 1, 3, 0,            /* 0xed */
1729                 {{0, 0},
1730                 {2, 3},
1731                 {5, 7},
1732                 {0, 0}
1733                 }
1734         },
1735         {0, 1, 2, 0,            /* 0xee */
1736                 {{1, 3},
1737                 {5, 7},
1738                 {0, 0},
1739                 {0, 0}
1740                 }
1741         },
1742         {1, 1, 2, 0,            /* 0xef */
1743                 {{0, 3},
1744                 {5, 7},
1745                 {0, 0},
1746                 {0, 0}
1747                 }
1748         },
1749         {0, 1, 1, 0,            /* 0xf0 */
1750                 {{4, 7},
1751                 {0, 0},
1752                 {0, 0},
1753                 {0, 0}
1754                 }
1755         },
1756         {1, 1, 2, 0,            /* 0xf1 */
1757                 {{0, 0},
1758                 {4, 7},
1759                 {0, 0},
1760                 {0, 0}
1761                 }
1762         },
1763         {0, 1, 2, 0,            /* 0xf2 */
1764                 {{1, 1},
1765                 {4, 7},
1766                 {0, 0},
1767                 {0, 0}
1768                 }
1769         },
1770         {1, 1, 2, 0,            /* 0xf3 */
1771                 {{0, 1},
1772                 {4, 7},
1773                 {0, 0},
1774                 {0, 0}
1775                 }
1776         },
1777         {0, 1, 2, 0,            /* 0xf4 */
1778                 {{2, 2},
1779                 {4, 7},
1780                 {0, 0},
1781                 {0, 0}
1782                 }
1783         },
1784         {1, 1, 3, 0,            /* 0xf5 */
1785                 {{0, 0},
1786                 {2, 2},
1787                 {4, 7},
1788                 {0, 0}
1789                 }
1790         },
1791         {0, 1, 2, 0,            /* 0xf6 */
1792                 {{1, 2},
1793                 {4, 7},
1794                 {0, 0},
1795                 {0, 0}
1796                 }
1797         },
1798         {1, 1, 2, 0,            /* 0xf7 */
1799                 {{0, 2},
1800                 {4, 7},
1801                 {0, 0},
1802                 {0, 0}
1803                 }
1804         },
1805         {0, 1, 1, 0,            /* 0xf8 */
1806                 {{3, 7},
1807                 {0, 0},
1808                 {0, 0},
1809                 {0, 0}
1810                 }
1811         },
1812         {1, 1, 2, 0,            /* 0xf9 */
1813                 {{0, 0},
1814                 {3, 7},
1815                 {0, 0},
1816                 {0, 0}
1817                 }
1818         },
1819         {0, 1, 2, 0,            /* 0xfa */
1820                 {{1, 1},
1821                 {3, 7},
1822                 {0, 0},
1823                 {0, 0}
1824                 }
1825         },
1826         {1, 1, 2, 0,            /* 0xfb */
1827                 {{0, 1},
1828                 {3, 7},
1829                 {0, 0},
1830                 {0, 0}
1831                 }
1832         },
1833         {0, 1, 1, 0,            /* 0xfc */
1834                 {{2, 7},
1835                 {0, 0},
1836                 {0, 0},
1837                 {0, 0}
1838                 }
1839         },
1840         {1, 1, 2, 0,            /* 0xfd */
1841                 {{0, 0},
1842                 {2, 7},
1843                 {0, 0},
1844                 {0, 0}
1845                 }
1846         },
1847         {0, 1, 1, 0,            /* 0xfe */
1848                 {{1, 7},
1849                 {0, 0},
1850                 {0, 0},
1851                 {0, 0}
1852                 }
1853         },
1854         {1, 1, 1, 0,            /* 0xff */
1855                 {{0, 7},
1856                 {0, 0},
1857                 {0, 0},
1858                 {0, 0}
1859                 }
1860         }
1861 };
1862
1863
1864 int
1865 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1866     int ipv4_addr_legal,
1867     int ipv6_addr_legal,
1868     int loopback_scope,
1869     int ipv4_local_scope,
1870     int local_scope SCTP_UNUSED,/* XXX */
1871     int site_scope,
1872     int do_update)
1873 {
1874         if ((loopback_scope == 0) &&
1875             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876                 /*
1877                  * skip loopback if not in scope *
1878                  */
1879                 return (0);
1880         }
1881         switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883         case AF_INET:
1884                 if (ipv4_addr_legal) {
1885                         struct sockaddr_in *sin;
1886
1887                         sin = (struct sockaddr_in *)&ifa->address.sin;
1888                         if (sin->sin_addr.s_addr == 0) {
1889                                 /* not in scope , unspecified */
1890                                 return (0);
1891                         }
1892                         if ((ipv4_local_scope == 0) &&
1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894                                 /* private address not in scope */
1895                                 return (0);
1896                         }
1897                 } else {
1898                         return (0);
1899                 }
1900                 break;
1901 #endif
1902 #ifdef INET6
1903         case AF_INET6:
1904                 if (ipv6_addr_legal) {
1905                         struct sockaddr_in6 *sin6;
1906
1907                         /*
1908                          * Must update the flags,  bummer, which means any
1909                          * IFA locks must now be applied HERE <->
1910                          */
1911                         if (do_update) {
1912                                 sctp_gather_internal_ifa_flags(ifa);
1913                         }
1914                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915                                 return (0);
1916                         }
1917                         /* ok to use deprecated addresses? */
1918                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1919                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920                                 /* skip unspecifed addresses */
1921                                 return (0);
1922                         }
1923                         if (    /* (local_scope == 0) && */
1924                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925                                 return (0);
1926                         }
1927                         if ((site_scope == 0) &&
1928                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929                                 return (0);
1930                         }
1931                 } else {
1932                         return (0);
1933                 }
1934                 break;
1935 #endif
1936         default:
1937                 return (0);
1938         }
1939         return (1);
1940 }
1941
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
1944 {
1945         struct sctp_paramhdr *parmh;
1946         struct mbuf *mret;
1947         uint16_t plen;
1948
1949         switch (ifa->address.sa.sa_family) {
1950 #ifdef INET
1951         case AF_INET:
1952                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
1953                 break;
1954 #endif
1955 #ifdef INET6
1956         case AF_INET6:
1957                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
1958                 break;
1959 #endif
1960         default:
1961                 return (m);
1962         }
1963         if (M_TRAILINGSPACE(m) >= plen) {
1964                 /* easy side we just drop it on the end */
1965                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 parmh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = (struct sockaddr_in *)&ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1991                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         parmh->param_length = htons(plen);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += plen;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2006                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         parmh->param_length = htons(plen);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += plen;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         if (len != NULL) {
2020                 *len += plen;
2021         }
2022         return (mret);
2023 }
2024
2025
2026 struct mbuf *
2027 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2028     struct sctp_scoping *scope,
2029     struct mbuf *m_at, int cnt_inits_to,
2030     uint16_t * padding_len, uint16_t * chunk_len)
2031 {
2032         struct sctp_vrf *vrf = NULL;
2033         int cnt, limit_out = 0, total_count;
2034         uint32_t vrf_id;
2035
2036         vrf_id = inp->def_vrf_id;
2037         SCTP_IPI_ADDR_RLOCK();
2038         vrf = sctp_find_vrf(vrf_id);
2039         if (vrf == NULL) {
2040                 SCTP_IPI_ADDR_RUNLOCK();
2041                 return (m_at);
2042         }
2043         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2044                 struct sctp_ifa *sctp_ifap;
2045                 struct sctp_ifn *sctp_ifnp;
2046
2047                 cnt = cnt_inits_to;
2048                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2049                         limit_out = 1;
2050                         cnt = SCTP_ADDRESS_LIMIT;
2051                         goto skip_count;
2052                 }
2053                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2054                         if ((scope->loopback_scope == 0) &&
2055                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2056                                 /*
2057                                  * Skip loopback devices if loopback_scope
2058                                  * not set
2059                                  */
2060                                 continue;
2061                         }
2062                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2063                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2064                                         continue;
2065                                 }
2066                                 if (sctp_is_address_in_scope(sctp_ifap,
2067                                     scope->ipv4_addr_legal,
2068                                     scope->ipv6_addr_legal,
2069                                     scope->loopback_scope,
2070                                     scope->ipv4_local_scope,
2071                                     scope->local_scope,
2072                                     scope->site_scope, 1) == 0) {
2073                                         continue;
2074                                 }
2075                                 cnt++;
2076                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2077                                         break;
2078                                 }
2079                         }
2080                         if (cnt > SCTP_ADDRESS_LIMIT) {
2081                                 break;
2082                         }
2083                 }
2084 skip_count:
2085                 if (cnt > 1) {
2086                         total_count = 0;
2087                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2088                                 cnt = 0;
2089                                 if ((scope->loopback_scope == 0) &&
2090                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2091                                         /*
2092                                          * Skip loopback devices if
2093                                          * loopback_scope not set
2094                                          */
2095                                         continue;
2096                                 }
2097                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2098                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2099                                                 continue;
2100                                         }
2101                                         if (sctp_is_address_in_scope(sctp_ifap,
2102                                             scope->ipv4_addr_legal,
2103                                             scope->ipv6_addr_legal,
2104                                             scope->loopback_scope,
2105                                             scope->ipv4_local_scope,
2106                                             scope->local_scope,
2107                                             scope->site_scope, 0) == 0) {
2108                                                 continue;
2109                                         }
2110                                         if ((chunk_len != NULL) &&
2111                                             (padding_len != NULL) &&
2112                                             (*padding_len > 0)) {
2113                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2114                                                 SCTP_BUF_LEN(m_at) += *padding_len;
2115                                                 *chunk_len += *padding_len;
2116                                                 *padding_len = 0;
2117                                         }
2118                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
2119                                         if (limit_out) {
2120                                                 cnt++;
2121                                                 total_count++;
2122                                                 if (cnt >= 2) {
2123                                                         /*
2124                                                          * two from each
2125                                                          * address
2126                                                          */
2127                                                         break;
2128                                                 }
2129                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2130                                                         /* No more addresses */
2131                                                         break;
2132                                                 }
2133                                         }
2134                                 }
2135                         }
2136                 }
2137         } else {
2138                 struct sctp_laddr *laddr;
2139
2140                 cnt = cnt_inits_to;
2141                 /* First, how many ? */
2142                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2143                         if (laddr->ifa == NULL) {
2144                                 continue;
2145                         }
2146                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2147                                 /*
2148                                  * Address being deleted by the system, dont
2149                                  * list.
2150                                  */
2151                                 continue;
2152                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2153                                 /*
2154                                  * Address being deleted on this ep don't
2155                                  * list.
2156                                  */
2157                                 continue;
2158                         }
2159                         if (sctp_is_address_in_scope(laddr->ifa,
2160                             scope->ipv4_addr_legal,
2161                             scope->ipv6_addr_legal,
2162                             scope->loopback_scope,
2163                             scope->ipv4_local_scope,
2164                             scope->local_scope,
2165                             scope->site_scope, 1) == 0) {
2166                                 continue;
2167                         }
2168                         cnt++;
2169                 }
2170                 /*
2171                  * To get through a NAT we only list addresses if we have
2172                  * more than one. That way if you just bind a single address
2173                  * we let the source of the init dictate our address.
2174                  */
2175                 if (cnt > 1) {
2176                         cnt = cnt_inits_to;
2177                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2178                                 if (laddr->ifa == NULL) {
2179                                         continue;
2180                                 }
2181                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2182                                         continue;
2183                                 }
2184                                 if (sctp_is_address_in_scope(laddr->ifa,
2185                                     scope->ipv4_addr_legal,
2186                                     scope->ipv6_addr_legal,
2187                                     scope->loopback_scope,
2188                                     scope->ipv4_local_scope,
2189                                     scope->local_scope,
2190                                     scope->site_scope, 0) == 0) {
2191                                         continue;
2192                                 }
2193                                 if ((chunk_len != NULL) &&
2194                                     (padding_len != NULL) &&
2195                                     (*padding_len > 0)) {
2196                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
2197                                         SCTP_BUF_LEN(m_at) += *padding_len;
2198                                         *chunk_len += *padding_len;
2199                                         *padding_len = 0;
2200                                 }
2201                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
2202                                 cnt++;
2203                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2204                                         break;
2205                                 }
2206                         }
2207                 }
2208         }
2209         SCTP_IPI_ADDR_RUNLOCK();
2210         return (m_at);
2211 }
2212
2213 static struct sctp_ifa *
2214 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2215     uint8_t dest_is_loop,
2216     uint8_t dest_is_priv,
2217     sa_family_t fam)
2218 {
2219         uint8_t dest_is_global = 0;
2220
2221         /* dest_is_priv is true if destination is a private address */
2222         /* dest_is_loop is true if destination is a loopback addresses */
2223
2224         /**
2225          * Here we determine if its a preferred address. A preferred address
2226          * means it is the same scope or higher scope then the destination.
2227          * L = loopback, P = private, G = global
2228          * -----------------------------------------
2229          *    src    |  dest | result
2230          *  ----------------------------------------
2231          *     L     |    L  |    yes
2232          *  -----------------------------------------
2233          *     P     |    L  |    yes-v4 no-v6
2234          *  -----------------------------------------
2235          *     G     |    L  |    yes-v4 no-v6
2236          *  -----------------------------------------
2237          *     L     |    P  |    no
2238          *  -----------------------------------------
2239          *     P     |    P  |    yes
2240          *  -----------------------------------------
2241          *     G     |    P  |    no
2242          *   -----------------------------------------
2243          *     L     |    G  |    no
2244          *   -----------------------------------------
2245          *     P     |    G  |    no
2246          *    -----------------------------------------
2247          *     G     |    G  |    yes
2248          *    -----------------------------------------
2249          */
2250
2251         if (ifa->address.sa.sa_family != fam) {
2252                 /* forget mis-matched family */
2253                 return (NULL);
2254         }
2255         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2256                 dest_is_global = 1;
2257         }
2258         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2259         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2260         /* Ok the address may be ok */
2261 #ifdef INET6
2262         if (fam == AF_INET6) {
2263                 /* ok to use deprecated addresses? no lets not! */
2264                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2265                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2266                         return (NULL);
2267                 }
2268                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2269                         if (dest_is_loop) {
2270                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2271                                 return (NULL);
2272                         }
2273                 }
2274                 if (ifa->src_is_glob) {
2275                         if (dest_is_loop) {
2276                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2277                                 return (NULL);
2278                         }
2279                 }
2280         }
2281 #endif
2282         /*
2283          * Now that we know what is what, implement or table this could in
2284          * theory be done slicker (it used to be), but this is
2285          * straightforward and easier to validate :-)
2286          */
2287         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2288             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2289         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2290             dest_is_loop, dest_is_priv, dest_is_global);
2291
2292         if ((ifa->src_is_loop) && (dest_is_priv)) {
2293                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2294                 return (NULL);
2295         }
2296         if ((ifa->src_is_glob) && (dest_is_priv)) {
2297                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2298                 return (NULL);
2299         }
2300         if ((ifa->src_is_loop) && (dest_is_global)) {
2301                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2302                 return (NULL);
2303         }
2304         if ((ifa->src_is_priv) && (dest_is_global)) {
2305                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2306                 return (NULL);
2307         }
2308         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2309         /* its a preferred address */
2310         return (ifa);
2311 }
2312
2313 static struct sctp_ifa *
2314 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2315     uint8_t dest_is_loop,
2316     uint8_t dest_is_priv,
2317     sa_family_t fam)
2318 {
2319         uint8_t dest_is_global = 0;
2320
2321         /**
2322          * Here we determine if its a acceptable address. A acceptable
2323          * address means it is the same scope or higher scope but we can
2324          * allow for NAT which means its ok to have a global dest and a
2325          * private src.
2326          *
2327          * L = loopback, P = private, G = global
2328          * -----------------------------------------
2329          *  src    |  dest | result
2330          * -----------------------------------------
2331          *   L     |   L   |    yes
2332          *  -----------------------------------------
2333          *   P     |   L   |    yes-v4 no-v6
2334          *  -----------------------------------------
2335          *   G     |   L   |    yes
2336          * -----------------------------------------
2337          *   L     |   P   |    no
2338          * -----------------------------------------
2339          *   P     |   P   |    yes
2340          * -----------------------------------------
2341          *   G     |   P   |    yes - May not work
2342          * -----------------------------------------
2343          *   L     |   G   |    no
2344          * -----------------------------------------
2345          *   P     |   G   |    yes - May not work
2346          * -----------------------------------------
2347          *   G     |   G   |    yes
2348          * -----------------------------------------
2349          */
2350
2351         if (ifa->address.sa.sa_family != fam) {
2352                 /* forget non matching family */
2353                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2354                     ifa->address.sa.sa_family, fam);
2355                 return (NULL);
2356         }
2357         /* Ok the address may be ok */
2358         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2359         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2360             dest_is_loop, dest_is_priv);
2361         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2362                 dest_is_global = 1;
2363         }
2364 #ifdef INET6
2365         if (fam == AF_INET6) {
2366                 /* ok to use deprecated addresses? */
2367                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2368                         return (NULL);
2369                 }
2370                 if (ifa->src_is_priv) {
2371                         /* Special case, linklocal to loop */
2372                         if (dest_is_loop)
2373                                 return (NULL);
2374                 }
2375         }
2376 #endif
2377         /*
2378          * Now that we know what is what, implement our table. This could in
2379          * theory be done slicker (it used to be), but this is
2380          * straightforward and easier to validate :-)
2381          */
2382         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2383             ifa->src_is_loop,
2384             dest_is_priv);
2385         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2386                 return (NULL);
2387         }
2388         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2389             ifa->src_is_loop,
2390             dest_is_global);
2391         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2392                 return (NULL);
2393         }
2394         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2395         /* its an acceptable address */
2396         return (ifa);
2397 }
2398
2399 int
2400 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2401 {
2402         struct sctp_laddr *laddr;
2403
2404         if (stcb == NULL) {
2405                 /* There are no restrictions, no TCB :-) */
2406                 return (0);
2407         }
2408         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2409                 if (laddr->ifa == NULL) {
2410                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2411                             __FUNCTION__);
2412                         continue;
2413                 }
2414                 if (laddr->ifa == ifa) {
2415                         /* Yes it is on the list */
2416                         return (1);
2417                 }
2418         }
2419         return (0);
2420 }
2421
2422
2423 int
2424 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2425 {
2426         struct sctp_laddr *laddr;
2427
2428         if (ifa == NULL)
2429                 return (0);
2430         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2431                 if (laddr->ifa == NULL) {
2432                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2433                             __FUNCTION__);
2434                         continue;
2435                 }
2436                 if ((laddr->ifa == ifa) && laddr->action == 0)
2437                         /* same pointer */
2438                         return (1);
2439         }
2440         return (0);
2441 }
2442
2443
2444
2445 static struct sctp_ifa *
2446 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2447     sctp_route_t * ro,
2448     uint32_t vrf_id,
2449     int non_asoc_addr_ok,
2450     uint8_t dest_is_priv,
2451     uint8_t dest_is_loop,
2452     sa_family_t fam)
2453 {
2454         struct sctp_laddr *laddr, *starting_point;
2455         void *ifn;
2456         int resettotop = 0;
2457         struct sctp_ifn *sctp_ifn;
2458         struct sctp_ifa *sctp_ifa, *sifa;
2459         struct sctp_vrf *vrf;
2460         uint32_t ifn_index;
2461
2462         vrf = sctp_find_vrf(vrf_id);
2463         if (vrf == NULL)
2464                 return (NULL);
2465
2466         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2467         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2468         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2469         /*
2470          * first question, is the ifn we will emit on in our list, if so, we
2471          * want such an address. Note that we first looked for a preferred
2472          * address.
2473          */
2474         if (sctp_ifn) {
2475                 /* is a preferred one on the interface we route out? */
2476                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2477                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2478                             (non_asoc_addr_ok == 0))
2479                                 continue;
2480                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2481                             dest_is_loop,
2482                             dest_is_priv, fam);
2483                         if (sifa == NULL)
2484                                 continue;
2485                         if (sctp_is_addr_in_ep(inp, sifa)) {
2486                                 atomic_add_int(&sifa->refcount, 1);
2487                                 return (sifa);
2488                         }
2489                 }
2490         }
2491         /*
2492          * ok, now we now need to find one on the list of the addresses. We
2493          * can't get one on the emitting interface so let's find first a
2494          * preferred one. If not that an acceptable one otherwise... we
2495          * return NULL.
2496          */
2497         starting_point = inp->next_addr_touse;
2498 once_again:
2499         if (inp->next_addr_touse == NULL) {
2500                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2501                 resettotop = 1;
2502         }
2503         for (laddr = inp->next_addr_touse; laddr;
2504             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2505                 if (laddr->ifa == NULL) {
2506                         /* address has been removed */
2507                         continue;
2508                 }
2509                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2510                         /* address is being deleted */
2511                         continue;
2512                 }
2513                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2514                     dest_is_priv, fam);
2515                 if (sifa == NULL)
2516                         continue;
2517                 atomic_add_int(&sifa->refcount, 1);
2518                 return (sifa);
2519         }
2520         if (resettotop == 0) {
2521                 inp->next_addr_touse = NULL;
2522                 goto once_again;
2523         }
2524         inp->next_addr_touse = starting_point;
2525         resettotop = 0;
2526 once_again_too:
2527         if (inp->next_addr_touse == NULL) {
2528                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2529                 resettotop = 1;
2530         }
2531         /* ok, what about an acceptable address in the inp */
2532         for (laddr = inp->next_addr_touse; laddr;
2533             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2534                 if (laddr->ifa == NULL) {
2535                         /* address has been removed */
2536                         continue;
2537                 }
2538                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2539                         /* address is being deleted */
2540                         continue;
2541                 }
2542                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2543                     dest_is_priv, fam);
2544                 if (sifa == NULL)
2545                         continue;
2546                 atomic_add_int(&sifa->refcount, 1);
2547                 return (sifa);
2548         }
2549         if (resettotop == 0) {
2550                 inp->next_addr_touse = NULL;
2551                 goto once_again_too;
2552         }
2553         /*
2554          * no address bound can be a source for the destination we are in
2555          * trouble
2556          */
2557         return (NULL);
2558 }
2559
2560
2561
2562 static struct sctp_ifa *
2563 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2564     struct sctp_tcb *stcb,
2565     sctp_route_t * ro,
2566     uint32_t vrf_id,
2567     uint8_t dest_is_priv,
2568     uint8_t dest_is_loop,
2569     int non_asoc_addr_ok,
2570     sa_family_t fam)
2571 {
2572         struct sctp_laddr *laddr, *starting_point;
2573         void *ifn;
2574         struct sctp_ifn *sctp_ifn;
2575         struct sctp_ifa *sctp_ifa, *sifa;
2576         uint8_t start_at_beginning = 0;
2577         struct sctp_vrf *vrf;
2578         uint32_t ifn_index;
2579
2580         /*
2581          * first question, is the ifn we will emit on in our list, if so, we
2582          * want that one.
2583          */
2584         vrf = sctp_find_vrf(vrf_id);
2585         if (vrf == NULL)
2586                 return (NULL);
2587
2588         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2589         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2590         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2591
2592         /*
2593          * first question, is the ifn we will emit on in our list?  If so,
2594          * we want that one. First we look for a preferred. Second, we go
2595          * for an acceptable.
2596          */
2597         if (sctp_ifn) {
2598                 /* first try for a preferred address on the ep */
2599                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2600                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2601                                 continue;
2602                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2603                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2604                                 if (sifa == NULL)
2605                                         continue;
2606                                 if (((non_asoc_addr_ok == 0) &&
2607                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2608                                     (non_asoc_addr_ok &&
2609                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2610                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2611                                         /* on the no-no list */
2612                                         continue;
2613                                 }
2614                                 atomic_add_int(&sifa->refcount, 1);
2615                                 return (sifa);
2616                         }
2617                 }
2618                 /* next try for an acceptable address on the ep */
2619                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2620                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2621                                 continue;
2622                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2623                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2624                                 if (sifa == NULL)
2625                                         continue;
2626                                 if (((non_asoc_addr_ok == 0) &&
2627                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2628                                     (non_asoc_addr_ok &&
2629                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2630                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2631                                         /* on the no-no list */
2632                                         continue;
2633                                 }
2634                                 atomic_add_int(&sifa->refcount, 1);
2635                                 return (sifa);
2636                         }
2637                 }
2638
2639         }
2640         /*
2641          * if we can't find one like that then we must look at all addresses
2642          * bound to pick one at first preferable then secondly acceptable.
2643          */
2644         starting_point = stcb->asoc.last_used_address;
2645 sctp_from_the_top:
2646         if (stcb->asoc.last_used_address == NULL) {
2647                 start_at_beginning = 1;
2648                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2649         }
2650         /* search beginning with the last used address */
2651         for (laddr = stcb->asoc.last_used_address; laddr;
2652             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2653                 if (laddr->ifa == NULL) {
2654                         /* address has been removed */
2655                         continue;
2656                 }
2657                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2658                         /* address is being deleted */
2659                         continue;
2660                 }
2661                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2662                 if (sifa == NULL)
2663                         continue;
2664                 if (((non_asoc_addr_ok == 0) &&
2665                     (sctp_is_addr_restricted(stcb, sifa))) ||
2666                     (non_asoc_addr_ok &&
2667                     (sctp_is_addr_restricted(stcb, sifa)) &&
2668                     (!sctp_is_addr_pending(stcb, sifa)))) {
2669                         /* on the no-no list */
2670                         continue;
2671                 }
2672                 stcb->asoc.last_used_address = laddr;
2673                 atomic_add_int(&sifa->refcount, 1);
2674                 return (sifa);
2675         }
2676         if (start_at_beginning == 0) {
2677                 stcb->asoc.last_used_address = NULL;
2678                 goto sctp_from_the_top;
2679         }
2680         /* now try for any higher scope than the destination */
2681         stcb->asoc.last_used_address = starting_point;
2682         start_at_beginning = 0;
2683 sctp_from_the_top2:
2684         if (stcb->asoc.last_used_address == NULL) {
2685                 start_at_beginning = 1;
2686                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2687         }
2688         /* search beginning with the last used address */
2689         for (laddr = stcb->asoc.last_used_address; laddr;
2690             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2691                 if (laddr->ifa == NULL) {
2692                         /* address has been removed */
2693                         continue;
2694                 }
2695                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2696                         /* address is being deleted */
2697                         continue;
2698                 }
2699                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2700                     dest_is_priv, fam);
2701                 if (sifa == NULL)
2702                         continue;
2703                 if (((non_asoc_addr_ok == 0) &&
2704                     (sctp_is_addr_restricted(stcb, sifa))) ||
2705                     (non_asoc_addr_ok &&
2706                     (sctp_is_addr_restricted(stcb, sifa)) &&
2707                     (!sctp_is_addr_pending(stcb, sifa)))) {
2708                         /* on the no-no list */
2709                         continue;
2710                 }
2711                 stcb->asoc.last_used_address = laddr;
2712                 atomic_add_int(&sifa->refcount, 1);
2713                 return (sifa);
2714         }
2715         if (start_at_beginning == 0) {
2716                 stcb->asoc.last_used_address = NULL;
2717                 goto sctp_from_the_top2;
2718         }
2719         return (NULL);
2720 }
2721
2722 static struct sctp_ifa *
2723 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2724     struct sctp_tcb *stcb,
2725     int non_asoc_addr_ok,
2726     uint8_t dest_is_loop,
2727     uint8_t dest_is_priv,
2728     int addr_wanted,
2729     sa_family_t fam,
2730     sctp_route_t * ro
2731 )
2732 {
2733         struct sctp_ifa *ifa, *sifa;
2734         int num_eligible_addr = 0;
2735
2736 #ifdef INET6
2737         struct sockaddr_in6 sin6, lsa6;
2738
2739         if (fam == AF_INET6) {
2740                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2741                 (void)sa6_recoverscope(&sin6);
2742         }
2743 #endif                          /* INET6 */
2744         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2745                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2746                     (non_asoc_addr_ok == 0))
2747                         continue;
2748                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2749                     dest_is_priv, fam);
2750                 if (sifa == NULL)
2751                         continue;
2752 #ifdef INET6
2753                 if (fam == AF_INET6 &&
2754                     dest_is_loop &&
2755                     sifa->src_is_loop && sifa->src_is_priv) {
2756                         /*
2757                          * don't allow fe80::1 to be a src on loop ::1, we
2758                          * don't list it to the peer so we will get an
2759                          * abort.
2760                          */
2761                         continue;
2762                 }
2763                 if (fam == AF_INET6 &&
2764                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2765                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2766                         /*
2767                          * link-local <-> link-local must belong to the same
2768                          * scope.
2769                          */
2770                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2771                         (void)sa6_recoverscope(&lsa6);
2772                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2773                                 continue;
2774                         }
2775                 }
2776 #endif                          /* INET6 */
2777
2778                 /*
2779                  * Check if the IPv6 address matches to next-hop. In the
2780                  * mobile case, old IPv6 address may be not deleted from the
2781                  * interface. Then, the interface has previous and new
2782                  * addresses.  We should use one corresponding to the
2783                  * next-hop.  (by micchie)
2784                  */
2785 #ifdef INET6
2786                 if (stcb && fam == AF_INET6 &&
2787                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2788                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2789                             == 0) {
2790                                 continue;
2791                         }
2792                 }
2793 #endif
2794 #ifdef INET
2795                 /* Avoid topologically incorrect IPv4 address */
2796                 if (stcb && fam == AF_INET &&
2797                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2798                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2799                                 continue;
2800                         }
2801                 }
2802 #endif
2803                 if (stcb) {
2804                         if (sctp_is_address_in_scope(ifa,
2805                             stcb->asoc.ipv4_addr_legal,
2806                             stcb->asoc.ipv6_addr_legal,
2807                             stcb->asoc.loopback_scope,
2808                             stcb->asoc.ipv4_local_scope,
2809                             stcb->asoc.local_scope,
2810                             stcb->asoc.site_scope, 0) == 0) {
2811                                 continue;
2812                         }
2813                         if (((non_asoc_addr_ok == 0) &&
2814                             (sctp_is_addr_restricted(stcb, sifa))) ||
2815                             (non_asoc_addr_ok &&
2816                             (sctp_is_addr_restricted(stcb, sifa)) &&
2817                             (!sctp_is_addr_pending(stcb, sifa)))) {
2818                                 /*
2819                                  * It is restricted for some reason..
2820                                  * probably not yet added.
2821                                  */
2822                                 continue;
2823                         }
2824                 }
2825                 if (num_eligible_addr >= addr_wanted) {
2826                         return (sifa);
2827                 }
2828                 num_eligible_addr++;
2829         }
2830         return (NULL);
2831 }
2832
2833
2834 static int
2835 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2836     struct sctp_tcb *stcb,
2837     int non_asoc_addr_ok,
2838     uint8_t dest_is_loop,
2839     uint8_t dest_is_priv,
2840     sa_family_t fam)
2841 {
2842         struct sctp_ifa *ifa, *sifa;
2843         int num_eligible_addr = 0;
2844
2845         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2846                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2847                     (non_asoc_addr_ok == 0)) {
2848                         continue;
2849                 }
2850                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2851                     dest_is_priv, fam);
2852                 if (sifa == NULL) {
2853                         continue;
2854                 }
2855                 if (stcb) {
2856                         if (sctp_is_address_in_scope(ifa,
2857                             stcb->asoc.ipv4_addr_legal,
2858                             stcb->asoc.ipv6_addr_legal,
2859                             stcb->asoc.loopback_scope,
2860                             stcb->asoc.ipv4_local_scope,
2861                             stcb->asoc.local_scope,
2862                             stcb->asoc.site_scope, 0) == 0) {
2863                                 continue;
2864                         }
2865                         if (((non_asoc_addr_ok == 0) &&
2866                             (sctp_is_addr_restricted(stcb, sifa))) ||
2867                             (non_asoc_addr_ok &&
2868                             (sctp_is_addr_restricted(stcb, sifa)) &&
2869                             (!sctp_is_addr_pending(stcb, sifa)))) {
2870                                 /*
2871                                  * It is restricted for some reason..
2872                                  * probably not yet added.
2873                                  */
2874                                 continue;
2875                         }
2876                 }
2877                 num_eligible_addr++;
2878         }
2879         return (num_eligible_addr);
2880 }
2881
2882 static struct sctp_ifa *
2883 sctp_choose_boundall(struct sctp_tcb *stcb,
2884     struct sctp_nets *net,
2885     sctp_route_t * ro,
2886     uint32_t vrf_id,
2887     uint8_t dest_is_priv,
2888     uint8_t dest_is_loop,
2889     int non_asoc_addr_ok,
2890     sa_family_t fam)
2891 {
2892         int cur_addr_num = 0, num_preferred = 0;
2893         void *ifn;
2894         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2895         struct sctp_ifa *sctp_ifa, *sifa;
2896         uint32_t ifn_index;
2897         struct sctp_vrf *vrf;
2898
2899 #ifdef INET
2900         int retried = 0;
2901
2902 #endif
2903
2904         /*-
2905          * For boundall we can use any address in the association.
2906          * If non_asoc_addr_ok is set we can use any address (at least in
2907          * theory). So we look for preferred addresses first. If we find one,
2908          * we use it. Otherwise we next try to get an address on the
2909          * interface, which we should be able to do (unless non_asoc_addr_ok
2910          * is false and we are routed out that way). In these cases where we
2911          * can't use the address of the interface we go through all the
2912          * ifn's looking for an address we can use and fill that in. Punting
2913          * means we send back address 0, which will probably cause problems
2914          * actually since then IP will fill in the address of the route ifn,
2915          * which means we probably already rejected it.. i.e. here comes an
2916          * abort :-<.
2917          */
2918         vrf = sctp_find_vrf(vrf_id);
2919         if (vrf == NULL)
2920                 return (NULL);
2921
2922         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2923         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2924         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2925         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2926         if (sctp_ifn == NULL) {
2927                 /* ?? We don't have this guy ?? */
2928                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2929                 goto bound_all_plan_b;
2930         }
2931         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2932             ifn_index, sctp_ifn->ifn_name);
2933
2934         if (net) {
2935                 cur_addr_num = net->indx_of_eligible_next_to_use;
2936         }
2937         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2938             stcb,
2939             non_asoc_addr_ok,
2940             dest_is_loop,
2941             dest_is_priv, fam);
2942         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2943             num_preferred, sctp_ifn->ifn_name);
2944         if (num_preferred == 0) {
2945                 /*
2946                  * no eligible addresses, we must use some other interface
2947                  * address if we can find one.
2948                  */
2949                 goto bound_all_plan_b;
2950         }
2951         /*
2952          * Ok we have num_eligible_addr set with how many we can use, this
2953          * may vary from call to call due to addresses being deprecated
2954          * etc..
2955          */
2956         if (cur_addr_num >= num_preferred) {
2957                 cur_addr_num = 0;
2958         }
2959         /*
2960          * select the nth address from the list (where cur_addr_num is the
2961          * nth) and 0 is the first one, 1 is the second one etc...
2962          */
2963         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2964
2965         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2966             dest_is_priv, cur_addr_num, fam, ro);
2967
2968         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2969         if (sctp_ifa) {
2970                 atomic_add_int(&sctp_ifa->refcount, 1);
2971                 if (net) {
2972                         /* save off where the next one we will want */
2973                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2974                 }
2975                 return (sctp_ifa);
2976         }
2977         /*
2978          * plan_b: Look at all interfaces and find a preferred address. If
2979          * no preferred fall through to plan_c.
2980          */
2981 bound_all_plan_b:
2982         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2983         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2984                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2985                     sctp_ifn->ifn_name);
2986                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2987                         /* wrong base scope */
2988                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2989                         continue;
2990                 }
2991                 if ((sctp_ifn == looked_at) && looked_at) {
2992                         /* already looked at this guy */
2993                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2994                         continue;
2995                 }
2996                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2997                     dest_is_loop, dest_is_priv, fam);
2998                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2999                     "Found ifn:%p %d preferred source addresses\n",
3000                     ifn, num_preferred);
3001                 if (num_preferred == 0) {
3002                         /* None on this interface. */
3003                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
3004                         continue;
3005                 }
3006                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
3007                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
3008                     num_preferred, (void *)sctp_ifn, cur_addr_num);
3009
3010                 /*
3011                  * Ok we have num_eligible_addr set with how many we can
3012                  * use, this may vary from call to call due to addresses
3013                  * being deprecated etc..
3014                  */
3015                 if (cur_addr_num >= num_preferred) {
3016                         cur_addr_num = 0;
3017                 }
3018                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
3019                     dest_is_priv, cur_addr_num, fam, ro);
3020                 if (sifa == NULL)
3021                         continue;
3022                 if (net) {
3023                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3024                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3025                             cur_addr_num);
3026                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3027                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3028                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3029                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3030                 }
3031                 atomic_add_int(&sifa->refcount, 1);
3032                 return (sifa);
3033         }
3034 #ifdef INET
3035 again_with_private_addresses_allowed:
3036 #endif
3037         /* plan_c: do we have an acceptable address on the emit interface */
3038         sifa = NULL;
3039         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3040         if (emit_ifn == NULL) {
3041                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3042                 goto plan_d;
3043         }
3044         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3045                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3046                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3047                     (non_asoc_addr_ok == 0)) {
3048                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3049                         continue;
3050                 }
3051                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3052                     dest_is_priv, fam);
3053                 if (sifa == NULL) {
3054                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3055                         continue;
3056                 }
3057                 if (stcb) {
3058                         if (sctp_is_address_in_scope(sifa,
3059                             stcb->asoc.ipv4_addr_legal,
3060                             stcb->asoc.ipv6_addr_legal,
3061                             stcb->asoc.loopback_scope,
3062                             stcb->asoc.ipv4_local_scope,
3063                             stcb->asoc.local_scope,
3064                             stcb->asoc.site_scope, 0) == 0) {
3065                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3066                                 sifa = NULL;
3067                                 continue;
3068                         }
3069                         if (((non_asoc_addr_ok == 0) &&
3070                             (sctp_is_addr_restricted(stcb, sifa))) ||
3071                             (non_asoc_addr_ok &&
3072                             (sctp_is_addr_restricted(stcb, sifa)) &&
3073                             (!sctp_is_addr_pending(stcb, sifa)))) {
3074                                 /*
3075                                  * It is restricted for some reason..
3076                                  * probably not yet added.
3077                                  */
3078                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3079                                 sifa = NULL;
3080                                 continue;
3081                         }
3082                 } else {
3083                         SCTP_PRINTF("Stcb is null - no print\n");
3084                 }
3085                 atomic_add_int(&sifa->refcount, 1);
3086                 goto out;
3087         }
3088 plan_d:
3089         /*
3090          * plan_d: We are in trouble. No preferred address on the emit
3091          * interface. And not even a preferred address on all interfaces. Go
3092          * out and see if we can find an acceptable address somewhere
3093          * amongst all interfaces.
3094          */
3095         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3096         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3097                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3098                         /* wrong base scope */
3099                         continue;
3100                 }
3101                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3102                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3103                             (non_asoc_addr_ok == 0))
3104                                 continue;
3105                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3106                             dest_is_loop,
3107                             dest_is_priv, fam);
3108                         if (sifa == NULL)
3109                                 continue;
3110                         if (stcb) {
3111                                 if (sctp_is_address_in_scope(sifa,
3112                                     stcb->asoc.ipv4_addr_legal,
3113                                     stcb->asoc.ipv6_addr_legal,
3114                                     stcb->asoc.loopback_scope,
3115                                     stcb->asoc.ipv4_local_scope,
3116                                     stcb->asoc.local_scope,
3117                                     stcb->asoc.site_scope, 0) == 0) {
3118                                         sifa = NULL;
3119                                         continue;
3120                                 }
3121                                 if (((non_asoc_addr_ok == 0) &&
3122                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3123                                     (non_asoc_addr_ok &&
3124                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3125                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3126                                         /*
3127                                          * It is restricted for some
3128                                          * reason.. probably not yet added.
3129                                          */
3130                                         sifa = NULL;
3131                                         continue;
3132                                 }
3133                         }
3134                         goto out;
3135                 }
3136         }
3137 #ifdef INET
3138         if ((retried == 0) && (stcb->asoc.ipv4_local_scope == 0)) {
3139                 stcb->asoc.ipv4_local_scope = 1;
3140                 retried = 1;
3141                 goto again_with_private_addresses_allowed;
3142         } else if (retried == 1) {
3143                 stcb->asoc.ipv4_local_scope = 0;
3144         }
3145 #endif
3146 out:
3147 #ifdef INET
3148         if (sifa) {
3149                 if (retried == 1) {
3150                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3151                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3152                                         /* wrong base scope */
3153                                         continue;
3154                                 }
3155                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3156                                         struct sctp_ifa *tmp_sifa;
3157
3158                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3159                                             (non_asoc_addr_ok == 0))
3160                                                 continue;
3161                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3162                                             dest_is_loop,
3163                                             dest_is_priv, fam);
3164                                         if (tmp_sifa == NULL) {
3165                                                 continue;
3166                                         }
3167                                         if (tmp_sifa == sifa) {
3168                                                 continue;
3169                                         }
3170                                         if (stcb) {
3171                                                 if (sctp_is_address_in_scope(tmp_sifa,
3172                                                     stcb->asoc.ipv4_addr_legal,
3173                                                     stcb->asoc.ipv6_addr_legal,
3174                                                     stcb->asoc.loopback_scope,
3175                                                     stcb->asoc.ipv4_local_scope,
3176                                                     stcb->asoc.local_scope,
3177                                                     stcb->asoc.site_scope, 0) == 0) {
3178                                                         continue;
3179                                                 }
3180                                                 if (((non_asoc_addr_ok == 0) &&
3181                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3182                                                     (non_asoc_addr_ok &&
3183                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3184                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3185                                                         /*
3186                                                          * It is restricted
3187                                                          * for some reason..
3188                                                          * probably not yet
3189                                                          * added.
3190                                                          */
3191                                                         continue;
3192                                                 }
3193                                         }
3194                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3195                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3196                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3197                                         }
3198                                 }
3199                         }
3200                 }
3201                 atomic_add_int(&sifa->refcount, 1);
3202         }
3203 #endif
3204         return (sifa);
3205 }
3206
3207
3208
3209 /* tcb may be NULL */
3210 struct sctp_ifa *
3211 sctp_source_address_selection(struct sctp_inpcb *inp,
3212     struct sctp_tcb *stcb,
3213     sctp_route_t * ro,
3214     struct sctp_nets *net,
3215     int non_asoc_addr_ok, uint32_t vrf_id)
3216 {
3217         struct sctp_ifa *answer;
3218         uint8_t dest_is_priv, dest_is_loop;
3219         sa_family_t fam;
3220
3221 #ifdef INET
3222         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3223
3224 #endif
3225 #ifdef INET6
3226         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3227
3228 #endif
3229
3230         /**
3231          * Rules: - Find the route if needed, cache if I can. - Look at
3232          * interface address in route, Is it in the bound list. If so we
3233          * have the best source. - If not we must rotate amongst the
3234          * addresses.
3235          *
3236          * Cavets and issues
3237          *
3238          * Do we need to pay attention to scope. We can have a private address
3239          * or a global address we are sourcing or sending to. So if we draw
3240          * it out
3241          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3242          * For V4
3243          * ------------------------------------------
3244          *      source     *      dest  *  result
3245          * -----------------------------------------
3246          * <a>  Private    *    Global  *  NAT
3247          * -----------------------------------------
3248          * <b>  Private    *    Private *  No problem
3249          * -----------------------------------------
3250          * <c>  Global     *    Private *  Huh, How will this work?
3251          * -----------------------------------------
3252          * <d>  Global     *    Global  *  No Problem
3253          *------------------------------------------
3254          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3255          * For V6
3256          *------------------------------------------
3257          *      source     *      dest  *  result
3258          * -----------------------------------------
3259          * <a>  Linklocal  *    Global  *
3260          * -----------------------------------------
3261          * <b>  Linklocal  * Linklocal  *  No problem
3262          * -----------------------------------------
3263          * <c>  Global     * Linklocal  *  Huh, How will this work?
3264          * -----------------------------------------
3265          * <d>  Global     *    Global  *  No Problem
3266          *------------------------------------------
3267          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3268          *
3269          * And then we add to that what happens if there are multiple addresses
3270          * assigned to an interface. Remember the ifa on a ifn is a linked
3271          * list of addresses. So one interface can have more than one IP
3272          * address. What happens if we have both a private and a global
3273          * address? Do we then use context of destination to sort out which
3274          * one is best? And what about NAT's sending P->G may get you a NAT
3275          * translation, or should you select the G thats on the interface in
3276          * preference.
3277          *
3278          * Decisions:
3279          *
3280          * - count the number of addresses on the interface.
3281          * - if it is one, no problem except case <c>.
3282          *   For <a> we will assume a NAT out there.
3283          * - if there are more than one, then we need to worry about scope P
3284          *   or G. We should prefer G -> G and P -> P if possible.
3285          *   Then as a secondary fall back to mixed types G->P being a last
3286          *   ditch one.
3287          * - The above all works for bound all, but bound specific we need to
3288          *   use the same concept but instead only consider the bound
3289          *   addresses. If the bound set is NOT assigned to the interface then
3290          *   we must use rotation amongst the bound addresses..
3291          */
3292         if (ro->ro_rt == NULL) {
3293                 /*
3294                  * Need a route to cache.
3295                  */
3296                 SCTP_RTALLOC(ro, vrf_id);
3297         }
3298         if (ro->ro_rt == NULL) {
3299                 return (NULL);
3300         }
3301         fam = ro->ro_dst.sa_family;
3302         dest_is_priv = dest_is_loop = 0;
3303         /* Setup our scopes for the destination */
3304         switch (fam) {
3305 #ifdef INET
3306         case AF_INET:
3307                 /* Scope based on outbound address */
3308                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3309                         dest_is_loop = 1;
3310                         if (net != NULL) {
3311                                 /* mark it as local */
3312                                 net->addr_is_local = 1;
3313                         }
3314                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3315                         dest_is_priv = 1;
3316                 }
3317                 break;
3318 #endif
3319 #ifdef INET6
3320         case AF_INET6:
3321                 /* Scope based on outbound address */
3322                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3323                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3324                         /*
3325                          * If the address is a loopback address, which
3326                          * consists of "::1" OR "fe80::1%lo0", we are
3327                          * loopback scope. But we don't use dest_is_priv
3328                          * (link local addresses).
3329                          */
3330                         dest_is_loop = 1;
3331                         if (net != NULL) {
3332                                 /* mark it as local */
3333                                 net->addr_is_local = 1;
3334                         }
3335                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3336                         dest_is_priv = 1;
3337                 }
3338                 break;
3339 #endif
3340         }
3341         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3342         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3343         SCTP_IPI_ADDR_RLOCK();
3344         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3345                 /*
3346                  * Bound all case
3347                  */
3348                 answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3349                     dest_is_priv, dest_is_loop,
3350                     non_asoc_addr_ok, fam);
3351                 SCTP_IPI_ADDR_RUNLOCK();
3352                 return (answer);
3353         }
3354         /*
3355          * Subset bound case
3356          */
3357         if (stcb) {
3358                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3359                     vrf_id, dest_is_priv,
3360                     dest_is_loop,
3361                     non_asoc_addr_ok, fam);
3362         } else {
3363                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3364                     non_asoc_addr_ok,
3365                     dest_is_priv,
3366                     dest_is_loop, fam);
3367         }
3368         SCTP_IPI_ADDR_RUNLOCK();
3369         return (answer);
3370 }
3371
3372 static int
3373 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3374 {
3375         struct cmsghdr cmh;
3376         int tlen, at, found;
3377         struct sctp_sndinfo sndinfo;
3378         struct sctp_prinfo prinfo;
3379         struct sctp_authinfo authinfo;
3380
3381         tlen = SCTP_BUF_LEN(control);
3382         at = 0;
3383         found = 0;
3384         /*
3385          * Independent of how many mbufs, find the c_type inside the control
3386          * structure and copy out the data.
3387          */
3388         while (at < tlen) {
3389                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3390                         /* There is not enough room for one more. */
3391                         return (found);
3392                 }
3393                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3394                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3395                         /* We dont't have a complete CMSG header. */
3396                         return (found);
3397                 }
3398                 if (((int)cmh.cmsg_len + at) > tlen) {
3399                         /* We don't have the complete CMSG. */
3400                         return (found);
3401                 }
3402                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3403                     ((c_type == cmh.cmsg_type) ||
3404                     ((c_type == SCTP_SNDRCV) &&
3405                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3406                     (cmh.cmsg_type == SCTP_PRINFO) ||
3407                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3408                         if (c_type == cmh.cmsg_type) {
3409                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3410                                         return (found);
3411                                 }
3412                                 /* It is exactly what we want. Copy it out. */
3413                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3414                                 return (1);
3415                         } else {
3416                                 struct sctp_sndrcvinfo *sndrcvinfo;
3417
3418                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3419                                 if (found == 0) {
3420                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3421                                                 return (found);
3422                                         }
3423                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3424                                 }
3425                                 switch (cmh.cmsg_type) {
3426                                 case SCTP_SNDINFO:
3427                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3428                                                 return (found);
3429                                         }
3430                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3431                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3432                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3433                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3434                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3435                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3436                                         break;
3437                                 case SCTP_PRINFO:
3438                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3439                                                 return (found);
3440                                         }
3441                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3442                                         sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3443                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3444                                         break;
3445                                 case SCTP_AUTHINFO:
3446                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3447                                                 return (found);
3448                                         }
3449                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3450                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3451                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3452                                         break;
3453                                 default:
3454                                         return (found);
3455                                 }
3456                                 found = 1;
3457                         }
3458                 }
3459                 at += CMSG_ALIGN(cmh.cmsg_len);
3460         }
3461         return (found);
3462 }
3463
3464 static int
3465 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3466 {
3467         struct cmsghdr cmh;
3468         int tlen, at;
3469         struct sctp_initmsg initmsg;
3470
3471 #ifdef INET
3472         struct sockaddr_in sin;
3473
3474 #endif
3475 #ifdef INET6
3476         struct sockaddr_in6 sin6;
3477
3478 #endif
3479
3480         tlen = SCTP_BUF_LEN(control);
3481         at = 0;
3482         while (at < tlen) {
3483                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3484                         /* There is not enough room for one more. */
3485                         *error = EINVAL;
3486                         return (1);
3487                 }
3488                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3489                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3490                         /* We dont't have a complete CMSG header. */
3491                         *error = EINVAL;
3492                         return (1);
3493                 }
3494                 if (((int)cmh.cmsg_len + at) > tlen) {
3495                         /* We don't have the complete CMSG. */
3496                         *error = EINVAL;
3497                         return (1);
3498                 }
3499                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3500                         switch (cmh.cmsg_type) {
3501                         case SCTP_INIT:
3502                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3503                                         *error = EINVAL;
3504                                         return (1);
3505                                 }
3506                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3507                                 if (initmsg.sinit_max_attempts)
3508                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3509                                 if (initmsg.sinit_num_ostreams)
3510                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3511                                 if (initmsg.sinit_max_instreams)
3512                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3513                                 if (initmsg.sinit_max_init_timeo)
3514                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3515                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3516                                         struct sctp_stream_out *tmp_str;
3517                                         unsigned int i;
3518
3519                                         /* Default is NOT correct */
3520                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3521                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3522                                         SCTP_TCB_UNLOCK(stcb);
3523                                         SCTP_MALLOC(tmp_str,
3524                                             struct sctp_stream_out *,
3525                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3526                                             SCTP_M_STRMO);
3527                                         SCTP_TCB_LOCK(stcb);
3528                                         if (tmp_str != NULL) {
3529                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3530                                                 stcb->asoc.strmout = tmp_str;
3531                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3532                                         } else {
3533                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3534                                         }
3535                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3536                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3537                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
3538                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
3539                                                 stcb->asoc.strmout[i].stream_no = i;
3540                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3541                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3542                                         }
3543                                 }
3544                                 break;
3545 #ifdef INET
3546                         case SCTP_DSTADDRV4:
3547                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3548                                         *error = EINVAL;
3549                                         return (1);
3550                                 }
3551                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3552                                 sin.sin_family = AF_INET;
3553                                 sin.sin_len = sizeof(struct sockaddr_in);
3554                                 sin.sin_port = stcb->rport;
3555                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3556                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3557                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3558                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3559                                         *error = EINVAL;
3560                                         return (1);
3561                                 }
3562                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3563                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3564                                         *error = ENOBUFS;
3565                                         return (1);
3566                                 }
3567                                 break;
3568 #endif
3569 #ifdef INET6
3570                         case SCTP_DSTADDRV6:
3571                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3572                                         *error = EINVAL;
3573                                         return (1);
3574                                 }
3575                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3576                                 sin6.sin6_family = AF_INET6;
3577                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3578                                 sin6.sin6_port = stcb->rport;
3579                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3580                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3581                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3582                                         *error = EINVAL;
3583                                         return (1);
3584                                 }
3585 #ifdef INET
3586                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3587                                         in6_sin6_2_sin(&sin, &sin6);
3588                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3589                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3590                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3591                                                 *error = EINVAL;
3592                                                 return (1);
3593                                         }
3594                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3595                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3596                                                 *error = ENOBUFS;
3597                                                 return (1);
3598                                         }
3599                                 } else
3600 #endif
3601                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3602                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3603                                         *error = ENOBUFS;
3604                                         return (1);
3605                                 }
3606                                 break;
3607 #endif
3608                         default:
3609                                 break;
3610                         }
3611                 }
3612                 at += CMSG_ALIGN(cmh.cmsg_len);
3613         }
3614         return (0);
3615 }
3616
3617 static struct sctp_tcb *
3618 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3619     in_port_t port,
3620     struct mbuf *control,
3621     struct sctp_nets **net_p,
3622     int *error)
3623 {
3624         struct cmsghdr cmh;
3625         int tlen, at;
3626         struct sctp_tcb *stcb;
3627         struct sockaddr *addr;
3628
3629 #ifdef INET
3630         struct sockaddr_in sin;
3631
3632 #endif
3633 #ifdef INET6
3634         struct sockaddr_in6 sin6;
3635
3636 #endif
3637
3638         tlen = SCTP_BUF_LEN(control);
3639         at = 0;
3640         while (at < tlen) {
3641                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3642                         /* There is not enough room for one more. */
3643                         *error = EINVAL;
3644                         return (NULL);
3645                 }
3646                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3647                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3648                         /* We dont't have a complete CMSG header. */
3649                         *error = EINVAL;
3650                         return (NULL);
3651                 }
3652                 if (((int)cmh.cmsg_len + at) > tlen) {
3653                         /* We don't have the complete CMSG. */
3654                         *error = EINVAL;
3655                         return (NULL);
3656                 }
3657                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3658                         switch (cmh.cmsg_type) {
3659 #ifdef INET
3660                         case SCTP_DSTADDRV4:
3661                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3662                                         *error = EINVAL;
3663                                         return (NULL);
3664                                 }
3665                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3666                                 sin.sin_family = AF_INET;
3667                                 sin.sin_len = sizeof(struct sockaddr_in);
3668                                 sin.sin_port = port;
3669                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3670                                 addr = (struct sockaddr *)&sin;
3671                                 break;
3672 #endif
3673 #ifdef INET6
3674                         case SCTP_DSTADDRV6:
3675                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3676                                         *error = EINVAL;
3677                                         return (NULL);
3678                                 }
3679                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3680                                 sin6.sin6_family = AF_INET6;
3681                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3682                                 sin6.sin6_port = port;
3683                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3684 #ifdef INET
3685                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3686                                         in6_sin6_2_sin(&sin, &sin6);
3687                                         addr = (struct sockaddr *)&sin;
3688                                 } else
3689 #endif
3690                                         addr = (struct sockaddr *)&sin6;
3691                                 break;
3692 #endif
3693                         default:
3694                                 addr = NULL;
3695                                 break;
3696                         }
3697                         if (addr) {
3698                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3699                                 if (stcb != NULL) {
3700                                         return (stcb);
3701                                 }
3702                         }
3703                 }
3704                 at += CMSG_ALIGN(cmh.cmsg_len);
3705         }
3706         return (NULL);
3707 }
3708
3709 static struct mbuf *
3710 sctp_add_cookie(struct mbuf *init, int init_offset,
3711     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3712 {
3713         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3714         struct sctp_state_cookie *stc;
3715         struct sctp_paramhdr *ph;
3716         uint8_t *foo;
3717         int sig_offset;
3718         uint16_t cookie_sz;
3719
3720         mret = NULL;
3721         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3722             sizeof(struct sctp_paramhdr)), 0,
3723             M_DONTWAIT, 1, MT_DATA);
3724         if (mret == NULL) {
3725                 return (NULL);
3726         }
3727         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3728         if (copy_init == NULL) {
3729                 sctp_m_freem(mret);
3730                 return (NULL);
3731         }
3732 #ifdef SCTP_MBUF_LOGGING
3733         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3734                 struct mbuf *mat;
3735
3736                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3737                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3738                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3739                         }
3740                 }
3741         }
3742 #endif
3743         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3744             M_DONTWAIT);
3745         if (copy_initack == NULL) {
3746                 sctp_m_freem(mret);
3747                 sctp_m_freem(copy_init);
3748                 return (NULL);
3749         }
3750 #ifdef SCTP_MBUF_LOGGING
3751         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3752                 struct mbuf *mat;
3753
3754                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3755                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3756                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3757                         }
3758                 }
3759         }
3760 #endif
3761         /* easy side we just drop it on the end */
3762         ph = mtod(mret, struct sctp_paramhdr *);
3763         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3764             sizeof(struct sctp_paramhdr);
3765         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3766             sizeof(struct sctp_paramhdr));
3767         ph->param_type = htons(SCTP_STATE_COOKIE);
3768         ph->param_length = 0;   /* fill in at the end */
3769         /* Fill in the stc cookie data */
3770         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3771
3772         /* tack the INIT and then the INIT-ACK onto the chain */
3773         cookie_sz = 0;
3774         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3775                 cookie_sz += SCTP_BUF_LEN(m_at);
3776                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3777                         SCTP_BUF_NEXT(m_at) = copy_init;
3778                         break;
3779                 }
3780         }
3781         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3782                 cookie_sz += SCTP_BUF_LEN(m_at);
3783                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3784                         SCTP_BUF_NEXT(m_at) = copy_initack;
3785                         break;
3786                 }
3787         }
3788         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3789                 cookie_sz += SCTP_BUF_LEN(m_at);
3790                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3791                         break;
3792                 }
3793         }
3794         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3795         if (sig == NULL) {
3796                 /* no space, so free the entire chain */
3797                 sctp_m_freem(mret);
3798                 return (NULL);
3799         }
3800         SCTP_BUF_LEN(sig) = 0;
3801         SCTP_BUF_NEXT(m_at) = sig;
3802         sig_offset = 0;
3803         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3804         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3805         *signature = foo;
3806         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3807         cookie_sz += SCTP_SIGNATURE_SIZE;
3808         ph->param_length = htons(cookie_sz);
3809         return (mret);
3810 }
3811
3812
3813 static uint8_t
3814 sctp_get_ect(struct sctp_tcb *stcb)
3815 {
3816         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3817                 return (SCTP_ECT0_BIT);
3818         } else {
3819                 return (0);
3820         }
3821 }
3822
3823 #if defined(INET) || defined(INET6)
3824 static void
3825 sctp_handle_no_route(struct sctp_tcb *stcb,
3826     struct sctp_nets *net,
3827     int so_locked)
3828 {
3829         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3830
3831         if (net) {
3832                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3833                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3834                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3835                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3836                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3837                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3838                                     stcb, 0,
3839                                     (void *)net,
3840                                     so_locked);
3841                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3842                                 net->dest_state &= ~SCTP_ADDR_PF;
3843                         }
3844                 }
3845                 if (stcb) {
3846                         if (net == stcb->asoc.primary_destination) {
3847                                 /* need a new primary */
3848                                 struct sctp_nets *alt;
3849
3850                                 alt = sctp_find_alternate_net(stcb, net, 0);
3851                                 if (alt != net) {
3852                                         if (stcb->asoc.alternate) {
3853                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3854                                         }
3855                                         stcb->asoc.alternate = alt;
3856                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3857                                         if (net->ro._s_addr) {
3858                                                 sctp_free_ifa(net->ro._s_addr);
3859                                                 net->ro._s_addr = NULL;
3860                                         }
3861                                         net->src_addr_selected = 0;
3862                                 }
3863                         }
3864                 }
3865         }
3866 }
3867
3868 #endif
3869
3870 static int
3871 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3872     struct sctp_tcb *stcb,      /* may be NULL */
3873     struct sctp_nets *net,
3874     struct sockaddr *to,
3875     struct mbuf *m,
3876     uint32_t auth_offset,
3877     struct sctp_auth_chunk *auth,
3878     uint16_t auth_keyid,
3879     int nofragment_flag,
3880     int ecn_ok,
3881     int out_of_asoc_ok,
3882     uint16_t src_port,
3883     uint16_t dest_port,
3884     uint32_t v_tag,
3885     uint16_t port,
3886     union sctp_sockstore *over_addr,
3887     uint8_t use_mflowid, uint32_t mflowid,
3888 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3889     int so_locked SCTP_UNUSED
3890 #else
3891     int so_locked
3892 #endif
3893 )
3894 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3895 {
3896         /**
3897          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3898          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3899          * - fill in the HMAC digest of any AUTH chunk in the packet.
3900          * - calculate and fill in the SCTP checksum.
3901          * - prepend an IP address header.
3902          * - if boundall use INADDR_ANY.
3903          * - if boundspecific do source address selection.
3904          * - set fragmentation option for ipV4.
3905          * - On return from IP output, check/adjust mtu size of output
3906          *   interface and smallest_mtu size as well.
3907          */
3908         /* Will need ifdefs around this */
3909         struct mbuf *newm;
3910         struct sctphdr *sctphdr;
3911         int packet_length;
3912         int ret;
3913         uint32_t vrf_id;
3914
3915 #if defined(INET) || defined(INET6)
3916         struct mbuf *o_pak;
3917         sctp_route_t *ro = NULL;
3918         struct udphdr *udp = NULL;
3919
3920 #endif
3921         uint8_t tos_value;
3922
3923 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3924         struct socket *so = NULL;
3925
3926 #endif
3927
3928         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3929                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3930                 sctp_m_freem(m);
3931                 return (EFAULT);
3932         }
3933         if (stcb) {
3934                 vrf_id = stcb->asoc.vrf_id;
3935         } else {
3936                 vrf_id = inp->def_vrf_id;
3937         }
3938
3939         /* fill in the HMAC digest for any AUTH chunk in the packet */
3940         if ((auth != NULL) && (stcb != NULL)) {
3941                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3942         }
3943         if (net) {
3944                 tos_value = net->dscp;
3945         } else if (stcb) {
3946                 tos_value = stcb->asoc.default_dscp;
3947         } else {
3948                 tos_value = inp->sctp_ep.default_dscp;
3949         }
3950
3951         switch (to->sa_family) {
3952 #ifdef INET
3953         case AF_INET:
3954                 {
3955                         struct ip *ip = NULL;
3956                         sctp_route_t iproute;
3957                         int len;
3958
3959                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3960                         if (port) {
3961                                 len += sizeof(struct udphdr);
3962                         }
3963                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3964                         if (newm == NULL) {
3965                                 sctp_m_freem(m);
3966                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3967                                 return (ENOMEM);
3968                         }
3969                         SCTP_ALIGN_TO_END(newm, len);
3970                         SCTP_BUF_LEN(newm) = len;
3971                         SCTP_BUF_NEXT(newm) = m;
3972                         m = newm;
3973                         if (net != NULL) {
3974 #ifdef INVARIANTS
3975                                 if (net->flowidset == 0) {
3976                                         panic("Flow ID not set");
3977                                 }
3978 #endif
3979                                 m->m_pkthdr.flowid = net->flowid;
3980                                 m->m_flags |= M_FLOWID;
3981                         } else {
3982                                 if (use_mflowid != 0) {
3983                                         m->m_pkthdr.flowid = mflowid;
3984                                         m->m_flags |= M_FLOWID;
3985                                 }
3986                         }
3987                         packet_length = sctp_calculate_len(m);
3988                         ip = mtod(m, struct ip *);
3989                         ip->ip_v = IPVERSION;
3990                         ip->ip_hl = (sizeof(struct ip) >> 2);
3991                         if (tos_value == 0) {
3992                                 /*
3993                                  * This means especially, that it is not set
3994                                  * at the SCTP layer. So use the value from
3995                                  * the IP layer.
3996                                  */
3997                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3998                         }
3999                         tos_value &= 0xfc;
4000                         if (ecn_ok) {
4001                                 tos_value |= sctp_get_ect(stcb);
4002                         }
4003                         if ((nofragment_flag) && (port == 0)) {
4004                                 ip->ip_off = IP_DF;
4005                         } else {
4006                                 ip->ip_off = 0;
4007                         }
4008                         /* FreeBSD has a function for ip_id's */
4009                         ip->ip_id = ip_newid();
4010
4011                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
4012                         ip->ip_len = packet_length;
4013                         ip->ip_tos = tos_value;
4014                         if (port) {
4015                                 ip->ip_p = IPPROTO_UDP;
4016                         } else {
4017                                 ip->ip_p = IPPROTO_SCTP;
4018                         }
4019                         ip->ip_sum = 0;
4020                         if (net == NULL) {
4021                                 ro = &iproute;
4022                                 memset(&iproute, 0, sizeof(iproute));
4023                                 memcpy(&ro->ro_dst, to, to->sa_len);
4024                         } else {
4025                                 ro = (sctp_route_t *) & net->ro;
4026                         }
4027                         /* Now the address selection part */
4028                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4029
4030                         /* call the routine to select the src address */
4031                         if (net && out_of_asoc_ok == 0) {
4032                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4033                                         sctp_free_ifa(net->ro._s_addr);
4034                                         net->ro._s_addr = NULL;
4035                                         net->src_addr_selected = 0;
4036                                         if (ro->ro_rt) {
4037                                                 RTFREE(ro->ro_rt);
4038                                                 ro->ro_rt = NULL;
4039                                         }
4040                                 }
4041                                 if (net->src_addr_selected == 0) {
4042                                         /* Cache the source address */
4043                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4044                                             ro, net, 0,
4045                                             vrf_id);
4046                                         net->src_addr_selected = 1;
4047                                 }
4048                                 if (net->ro._s_addr == NULL) {
4049                                         /* No route to host */
4050                                         net->src_addr_selected = 0;
4051                                         sctp_handle_no_route(stcb, net, so_locked);
4052                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4053                                         sctp_m_freem(m);
4054                                         return (EHOSTUNREACH);
4055                                 }
4056                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4057                         } else {
4058                                 if (over_addr == NULL) {
4059                                         struct sctp_ifa *_lsrc;
4060
4061                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4062                                             net,
4063                                             out_of_asoc_ok,
4064                                             vrf_id);
4065                                         if (_lsrc == NULL) {
4066                                                 sctp_handle_no_route(stcb, net, so_locked);
4067                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4068                                                 sctp_m_freem(m);
4069                                                 return (EHOSTUNREACH);
4070                                         }
4071                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4072                                         sctp_free_ifa(_lsrc);
4073                                 } else {
4074                                         ip->ip_src = over_addr->sin.sin_addr;
4075                                         SCTP_RTALLOC(ro, vrf_id);
4076                                 }
4077                         }
4078                         if (port) {
4079                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4080                                         sctp_handle_no_route(stcb, net, so_locked);
4081                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4082                                         sctp_m_freem(m);
4083                                         return (EHOSTUNREACH);
4084                                 }
4085                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4086                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4087                                 udp->uh_dport = port;
4088                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4089                                 if (V_udp_cksum) {
4090                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4091                                 } else {
4092                                         udp->uh_sum = 0;
4093                                 }
4094                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4095                         } else {
4096                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4097                         }
4098
4099                         sctphdr->src_port = src_port;
4100                         sctphdr->dest_port = dest_port;
4101                         sctphdr->v_tag = v_tag;
4102                         sctphdr->checksum = 0;
4103
4104                         /*
4105                          * If source address selection fails and we find no
4106                          * route then the ip_output should fail as well with
4107                          * a NO_ROUTE_TO_HOST type error. We probably should
4108                          * catch that somewhere and abort the association
4109                          * right away (assuming this is an INIT being sent).
4110                          */
4111                         if (ro->ro_rt == NULL) {
4112                                 /*
4113                                  * src addr selection failed to find a route
4114                                  * (or valid source addr), so we can't get
4115                                  * there from here (yet)!
4116                                  */
4117                                 sctp_handle_no_route(stcb, net, so_locked);
4118                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4119                                 sctp_m_freem(m);
4120                                 return (EHOSTUNREACH);
4121                         }
4122                         if (ro != &iproute) {
4123                                 memcpy(&iproute, ro, sizeof(*ro));
4124                         }
4125                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4126                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4127                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4128                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4129                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4130                             (void *)ro->ro_rt);
4131
4132                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4133                                 /* failed to prepend data, give up */
4134                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4135                                 sctp_m_freem(m);
4136                                 return (ENOMEM);
4137                         }
4138                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4139                         if (port) {
4140 #if defined(SCTP_WITH_NO_CSUM)
4141                                 SCTP_STAT_INCR(sctps_sendnocrc);
4142 #else
4143                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4144                                 SCTP_STAT_INCR(sctps_sendswcrc);
4145 #endif
4146                                 if (V_udp_cksum) {
4147                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4148                                 }
4149                         } else {
4150 #if defined(SCTP_WITH_NO_CSUM)
4151                                 SCTP_STAT_INCR(sctps_sendnocrc);
4152 #else
4153                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4154                                 m->m_pkthdr.csum_data = 0;
4155                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4156 #endif
4157                         }
4158 #ifdef SCTP_PACKET_LOGGING
4159                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4160                                 sctp_packet_log(o_pak);
4161 #endif
4162                         /* send it out.  table id is taken from stcb */
4163 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4164                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4165                                 so = SCTP_INP_SO(inp);
4166                                 SCTP_SOCKET_UNLOCK(so, 0);
4167                         }
4168 #endif
4169                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4170 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4171                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4172                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4173                                 SCTP_TCB_UNLOCK(stcb);
4174                                 SCTP_SOCKET_LOCK(so, 0);
4175                                 SCTP_TCB_LOCK(stcb);
4176                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4177                         }
4178 #endif
4179                         SCTP_STAT_INCR(sctps_sendpackets);
4180                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4181                         if (ret)
4182                                 SCTP_STAT_INCR(sctps_senderrors);
4183
4184                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4185                         if (net == NULL) {
4186                                 /* free tempy routes */
4187                                 if (ro->ro_rt) {
4188                                         RTFREE(ro->ro_rt);
4189                                         ro->ro_rt = NULL;
4190                                 }
4191                         } else {
4192                                 /*
4193                                  * PMTU check versus smallest asoc MTU goes
4194                                  * here
4195                                  */
4196                                 if ((ro->ro_rt != NULL) &&
4197                                     (net->ro._s_addr)) {
4198                                         uint32_t mtu;
4199
4200                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4201                                         if (net->port) {
4202                                                 mtu -= sizeof(struct udphdr);
4203                                         }
4204                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4205                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4206                                                 net->mtu = mtu;
4207                                         }
4208                                 } else if (ro->ro_rt == NULL) {
4209                                         /* route was freed */
4210                                         if (net->ro._s_addr &&
4211                                             net->src_addr_selected) {
4212                                                 sctp_free_ifa(net->ro._s_addr);
4213                                                 net->ro._s_addr = NULL;
4214                                         }
4215                                         net->src_addr_selected = 0;
4216                                 }
4217                         }
4218                         return (ret);
4219                 }
4220 #endif
4221 #ifdef INET6
4222         case AF_INET6:
4223                 {
4224                         uint32_t flowlabel, flowinfo;
4225                         struct ip6_hdr *ip6h;
4226                         struct route_in6 ip6route;
4227                         struct ifnet *ifp;
4228                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4229                         int prev_scope = 0;
4230                         struct sockaddr_in6 lsa6_storage;
4231                         int error;
4232                         u_short prev_port = 0;
4233                         int len;
4234
4235                         if (net) {
4236                                 flowlabel = net->flowlabel;
4237                         } else if (stcb) {
4238                                 flowlabel = stcb->asoc.default_flowlabel;
4239                         } else {
4240                                 flowlabel = inp->sctp_ep.default_flowlabel;
4241                         }
4242                         if (flowlabel == 0) {
4243                                 /*
4244                                  * This means especially, that it is not set
4245                                  * at the SCTP layer. So use the value from
4246                                  * the IP layer.
4247                                  */
4248                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4249                         }
4250                         flowlabel &= 0x000fffff;
4251                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4252                         if (port) {
4253                                 len += sizeof(struct udphdr);
4254                         }
4255                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4256                         if (newm == NULL) {
4257                                 sctp_m_freem(m);
4258                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4259                                 return (ENOMEM);
4260                         }
4261                         SCTP_ALIGN_TO_END(newm, len);
4262                         SCTP_BUF_LEN(newm) = len;
4263                         SCTP_BUF_NEXT(newm) = m;
4264                         m = newm;
4265                         if (net != NULL) {
4266 #ifdef INVARIANTS
4267                                 if (net->flowidset == 0) {
4268                                         panic("Flow ID not set");
4269                                 }
4270 #endif
4271                                 m->m_pkthdr.flowid = net->flowid;
4272                                 m->m_flags |= M_FLOWID;
4273                         } else {
4274                                 if (use_mflowid != 0) {
4275                                         m->m_pkthdr.flowid = mflowid;
4276                                         m->m_flags |= M_FLOWID;
4277                                 }
4278                         }
4279                         packet_length = sctp_calculate_len(m);
4280
4281                         ip6h = mtod(m, struct ip6_hdr *);
4282                         /* protect *sin6 from overwrite */
4283                         sin6 = (struct sockaddr_in6 *)to;
4284                         tmp = *sin6;
4285                         sin6 = &tmp;
4286
4287                         /* KAME hack: embed scopeid */
4288                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4289                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4290                                 return (EINVAL);
4291                         }
4292                         if (net == NULL) {
4293                                 memset(&ip6route, 0, sizeof(ip6route));
4294                                 ro = (sctp_route_t *) & ip6route;
4295                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4296                         } else {
4297                                 ro = (sctp_route_t *) & net->ro;
4298                         }
4299                         /*
4300                          * We assume here that inp_flow is in host byte
4301                          * order within the TCB!
4302                          */
4303                         if (tos_value == 0) {
4304                                 /*
4305                                  * This means especially, that it is not set
4306                                  * at the SCTP layer. So use the value from
4307                                  * the IP layer.
4308                                  */
4309                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4310                         }
4311                         tos_value &= 0xfc;
4312                         if (ecn_ok) {
4313                                 tos_value |= sctp_get_ect(stcb);
4314                         }
4315                         flowinfo = 0x06;
4316                         flowinfo <<= 8;
4317                         flowinfo |= tos_value;
4318                         flowinfo <<= 20;
4319                         flowinfo |= flowlabel;
4320                         ip6h->ip6_flow = htonl(flowinfo);
4321                         if (port) {
4322                                 ip6h->ip6_nxt = IPPROTO_UDP;
4323                         } else {
4324                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4325                         }
4326                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4327                         ip6h->ip6_dst = sin6->sin6_addr;
4328
4329                         /*
4330                          * Add SRC address selection here: we can only reuse
4331                          * to a limited degree the kame src-addr-sel, since
4332                          * we can try their selection but it may not be
4333                          * bound.
4334                          */
4335                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4336                         lsa6_tmp.sin6_family = AF_INET6;
4337                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4338                         lsa6 = &lsa6_tmp;
4339                         if (net && out_of_asoc_ok == 0) {
4340                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4341                                         sctp_free_ifa(net->ro._s_addr);
4342                                         net->ro._s_addr = NULL;
4343                                         net->src_addr_selected = 0;
4344                                         if (ro->ro_rt) {
4345                                                 RTFREE(ro->ro_rt);
4346                                                 ro->ro_rt = NULL;
4347                                         }
4348                                 }
4349                                 if (net->src_addr_selected == 0) {
4350                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4351                                         /* KAME hack: embed scopeid */
4352                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4353                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4354                                                 return (EINVAL);
4355                                         }
4356                                         /* Cache the source address */
4357                                         net->ro._s_addr = sctp_source_address_selection(inp,
4358                                             stcb,
4359                                             ro,
4360                                             net,
4361                                             0,
4362                                             vrf_id);
4363                                         (void)sa6_recoverscope(sin6);
4364                                         net->src_addr_selected = 1;
4365                                 }
4366                                 if (net->ro._s_addr == NULL) {
4367                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4368                                         net->src_addr_selected = 0;
4369                                         sctp_handle_no_route(stcb, net, so_locked);
4370                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4371                                         sctp_m_freem(m);
4372                                         return (EHOSTUNREACH);
4373                                 }
4374                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4375                         } else {
4376                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4377                                 /* KAME hack: embed scopeid */
4378                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4379                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4380                                         return (EINVAL);
4381                                 }
4382                                 if (over_addr == NULL) {
4383                                         struct sctp_ifa *_lsrc;
4384
4385                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4386                                             net,
4387                                             out_of_asoc_ok,
4388                                             vrf_id);
4389                                         if (_lsrc == NULL) {
4390                                                 sctp_handle_no_route(stcb, net, so_locked);
4391                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4392                                                 sctp_m_freem(m);
4393                                                 return (EHOSTUNREACH);
4394                                         }
4395                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4396                                         sctp_free_ifa(_lsrc);
4397                                 } else {
4398                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4399                                         SCTP_RTALLOC(ro, vrf_id);
4400                                 }
4401                                 (void)sa6_recoverscope(sin6);
4402                         }
4403                         lsa6->sin6_port = inp->sctp_lport;
4404
4405                         if (ro->ro_rt == NULL) {
4406                                 /*
4407                                  * src addr selection failed to find a route
4408                                  * (or valid source addr), so we can't get
4409                                  * there from here!
4410                                  */
4411                                 sctp_handle_no_route(stcb, net, so_locked);
4412                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4413                                 sctp_m_freem(m);
4414                                 return (EHOSTUNREACH);
4415                         }
4416                         /*
4417                          * XXX: sa6 may not have a valid sin6_scope_id in
4418                          * the non-SCOPEDROUTING case.
4419                          */
4420                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4421                         lsa6_storage.sin6_family = AF_INET6;
4422                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4423                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4424                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4425                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4426                                 sctp_m_freem(m);
4427                                 return (error);
4428                         }
4429                         /* XXX */
4430                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4431                         lsa6_storage.sin6_port = inp->sctp_lport;
4432                         lsa6 = &lsa6_storage;
4433                         ip6h->ip6_src = lsa6->sin6_addr;
4434
4435                         if (port) {
4436                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4437                                         sctp_handle_no_route(stcb, net, so_locked);
4438                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4439                                         sctp_m_freem(m);
4440                                         return (EHOSTUNREACH);
4441                                 }
4442                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4443                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4444                                 udp->uh_dport = port;
4445                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4446                                 udp->uh_sum = 0;
4447                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4448                         } else {
4449                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4450                         }
4451
4452                         sctphdr->src_port = src_port;
4453                         sctphdr->dest_port = dest_port;
4454                         sctphdr->v_tag = v_tag;
4455                         sctphdr->checksum = 0;
4456
4457                         /*
4458                          * We set the hop limit now since there is a good
4459                          * chance that our ro pointer is now filled
4460                          */
4461                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4462                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4463
4464 #ifdef SCTP_DEBUG
4465                         /* Copy to be sure something bad is not happening */
4466                         sin6->sin6_addr = ip6h->ip6_dst;
4467                         lsa6->sin6_addr = ip6h->ip6_src;
4468 #endif
4469
4470                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4471                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4472                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4473                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4474                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4475                         if (net) {
4476                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4477                                 /*
4478                                  * preserve the port and scope for link
4479                                  * local send
4480                                  */
4481                                 prev_scope = sin6->sin6_scope_id;
4482                                 prev_port = sin6->sin6_port;
4483                         }
4484                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4485                                 /* failed to prepend data, give up */
4486                                 sctp_m_freem(m);
4487                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4488                                 return (ENOMEM);
4489                         }
4490                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4491                         if (port) {
4492 #if defined(SCTP_WITH_NO_CSUM)
4493                                 SCTP_STAT_INCR(sctps_sendnocrc);
4494 #else
4495                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4496                                 SCTP_STAT_INCR(sctps_sendswcrc);
4497 #endif
4498                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4499                                         udp->uh_sum = 0xffff;
4500                                 }
4501                         } else {
4502 #if defined(SCTP_WITH_NO_CSUM)
4503                                 SCTP_STAT_INCR(sctps_sendnocrc);
4504 #else
4505                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4506                                 m->m_pkthdr.csum_data = 0;
4507                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4508 #endif
4509                         }
4510                         /* send it out. table id is taken from stcb */
4511 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4512                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4513                                 so = SCTP_INP_SO(inp);
4514                                 SCTP_SOCKET_UNLOCK(so, 0);
4515                         }
4516 #endif
4517 #ifdef SCTP_PACKET_LOGGING
4518                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4519                                 sctp_packet_log(o_pak);
4520 #endif
4521                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4522 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4523                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4524                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4525                                 SCTP_TCB_UNLOCK(stcb);
4526                                 SCTP_SOCKET_LOCK(so, 0);
4527                                 SCTP_TCB_LOCK(stcb);
4528                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4529                         }
4530 #endif
4531                         if (net) {
4532                                 /* for link local this must be done */
4533                                 sin6->sin6_scope_id = prev_scope;
4534                                 sin6->sin6_port = prev_port;
4535                         }
4536                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4537                         SCTP_STAT_INCR(sctps_sendpackets);
4538                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4539                         if (ret) {
4540                                 SCTP_STAT_INCR(sctps_senderrors);
4541                         }
4542                         if (net == NULL) {
4543                                 /* Now if we had a temp route free it */
4544                                 if (ro->ro_rt) {
4545                                         RTFREE(ro->ro_rt);
4546                                 }
4547                         } else {
4548                                 /*
4549                                  * PMTU check versus smallest asoc MTU goes
4550                                  * here
4551                                  */
4552                                 if (ro->ro_rt == NULL) {
4553                                         /* Route was freed */
4554                                         if (net->ro._s_addr &&
4555                                             net->src_addr_selected) {
4556                                                 sctp_free_ifa(net->ro._s_addr);
4557                                                 net->ro._s_addr = NULL;
4558                                         }
4559                                         net->src_addr_selected = 0;
4560                                 }
4561                                 if ((ro->ro_rt != NULL) &&
4562                                     (net->ro._s_addr)) {
4563                                         uint32_t mtu;
4564
4565                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4566                                         if (mtu &&
4567                                             (stcb->asoc.smallest_mtu > mtu)) {
4568                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4569                                                 net->mtu = mtu;
4570                                                 if (net->port) {
4571                                                         net->mtu -= sizeof(struct udphdr);
4572                                                 }
4573                                         }
4574                                 } else if (ifp) {
4575                                         if (ND_IFINFO(ifp)->linkmtu &&
4576                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4577                                                 sctp_mtu_size_reset(inp,
4578                                                     &stcb->asoc,
4579                                                     ND_IFINFO(ifp)->linkmtu);
4580                                         }
4581                                 }
4582                         }
4583                         return (ret);
4584                 }
4585 #endif
4586         default:
4587                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4588                     ((struct sockaddr *)to)->sa_family);
4589                 sctp_m_freem(m);
4590                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4591                 return (EFAULT);
4592         }
4593 }
4594
4595
4596 void
4597 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4598 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4599     SCTP_UNUSED
4600 #endif
4601 )
4602 {
4603         struct sctp_scoping scp;
4604         struct mbuf *m;
4605         struct sctp_nets *net;
4606         struct sctp_init_chunk *init;
4607         struct sctp_supported_addr_param *sup_addr;
4608         struct sctp_adaptation_layer_indication *ali;
4609         struct sctp_supported_chunk_types_param *pr_supported;
4610         struct sctp_paramhdr *ph;
4611         int cnt_inits_to = 0;
4612         int ret;
4613         uint16_t num_ext, chunk_len, padding_len, parameter_len;
4614
4615         /* INIT's always go to the primary (and usually ONLY address) */
4616         net = stcb->asoc.primary_destination;
4617         if (net == NULL) {
4618                 net = TAILQ_FIRST(&stcb->asoc.nets);
4619                 if (net == NULL) {
4620                         /* TSNH */
4621                         return;
4622                 }
4623                 /* we confirm any address we send an INIT to */
4624                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4625                 (void)sctp_set_primary_addr(stcb, NULL, net);
4626         } else {
4627                 /* we confirm any address we send an INIT to */
4628                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4629         }
4630         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4631 #ifdef INET6
4632         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
4633                 /*
4634                  * special hook, if we are sending to link local it will not
4635                  * show up in our private address count.
4636                  */
4637                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
4638                         cnt_inits_to = 1;
4639         }
4640 #endif
4641         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4642                 /* This case should not happen */
4643                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4644                 return;
4645         }
4646         /* start the INIT timer */
4647         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4648
4649         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4650         if (m == NULL) {
4651                 /* No memory, INIT timer will re-attempt. */
4652                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4653                 return;
4654         }
4655         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
4656         padding_len = 0;
4657         /*
4658          * assume peer supports asconf in order to be able to queue local
4659          * address changes while an INIT is in flight and before the assoc
4660          * is established.
4661          */
4662         stcb->asoc.peer_supports_asconf = 1;
4663         /* Now lets put the chunk header in place */
4664         init = mtod(m, struct sctp_init_chunk *);
4665         /* now the chunk header */
4666         init->ch.chunk_type = SCTP_INITIATION;
4667         init->ch.chunk_flags = 0;
4668         /* fill in later from mbuf we build */
4669         init->ch.chunk_length = 0;
4670         /* place in my tag */
4671         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4672         /* set up some of the credits. */
4673         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4674             SCTP_MINIMAL_RWND));
4675         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4676         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4677         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4678
4679 #if defined(INET) || defined(INET6)
4680         /* now the address restriction */
4681         /* XXX Should we take the address family of the socket into account? */
4682         sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
4683         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4684 #ifdef INET6
4685 #ifdef INET
4686         /* we support 2 types: IPv4/IPv6 */
4687         parameter_len = (uint16_t) (sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4688         sup_addr->ph.param_length = htons(parameter_len);
4689         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4690         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4691         padding_len = 0;
4692 #else
4693         /* we support 1 type: IPv6 */
4694         parameter_len = (uint16_t) (sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4695         sup_addr->ph.param_length = htons(parameter_len);
4696         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4697         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4698         padding_len = (uint16_t) sizeof(uint16_t);
4699 #endif
4700 #else
4701         /* we support 1 type: IPv4 */
4702         parameter_len = (uint16_t) (sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4703         sup_addr->ph.param_length = htons(parameter_len);
4704         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4705         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4706         padding_len = (uint16_t) sizeof(uint16_t);
4707 #endif
4708         chunk_len += parameter_len;
4709 #endif
4710         /* Adaptation layer indication parameter */
4711         /* XXX: Should we include this always? */
4712         if (padding_len > 0) {
4713                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4714                 chunk_len += padding_len;
4715                 padding_len = 0;
4716         }
4717         parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
4718         ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
4719         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4720         ali->ph.param_length = htons(parameter_len);
4721         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4722         chunk_len += parameter_len;
4723
4724         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4725                 /* Add NAT friendly parameter. */
4726                 if (padding_len > 0) {
4727                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4728                         chunk_len += padding_len;
4729                         padding_len = 0;
4730                 }
4731                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4732                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4733                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4734                 ph->param_length = htons(parameter_len);
4735                 chunk_len += parameter_len;
4736         }
4737         /* now any cookie time extensions */
4738         if (stcb->asoc.cookie_preserve_req) {
4739                 struct sctp_cookie_perserve_param *cookie_preserve;
4740
4741                 if (padding_len > 0) {
4742                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4743                         chunk_len += padding_len;
4744                         padding_len = 0;
4745                 }
4746                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
4747                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
4748                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4749                 cookie_preserve->ph.param_length = htons(parameter_len);
4750                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4751                 stcb->asoc.cookie_preserve_req = 0;
4752                 chunk_len += parameter_len;
4753         }
4754         /* ECN parameter */
4755         if (stcb->asoc.ecn_allowed == 1) {
4756                 if (padding_len > 0) {
4757                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4758                         chunk_len += padding_len;
4759                         padding_len = 0;
4760                 }
4761                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4762                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4763                 ph->param_type = htons(SCTP_ECN_CAPABLE);
4764                 ph->param_length = htons(parameter_len);
4765                 chunk_len += parameter_len;
4766         }
4767         /* And now tell the peer we do support PR-SCTP. */
4768         if (padding_len > 0) {
4769                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4770                 chunk_len += padding_len;
4771                 padding_len = 0;
4772         }
4773         parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
4774         ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
4775         ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
4776         ph->param_length = htons(parameter_len);
4777         chunk_len += parameter_len;
4778
4779         /* And now tell the peer we do all the extensions */
4780         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
4781         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4782         num_ext = 0;
4783         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4784         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4785         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4786         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4787         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4788         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4789                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4790         }
4791         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4792                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4793         }
4794         parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
4795         pr_supported->ph.param_length = htons(parameter_len);
4796         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4797         chunk_len += parameter_len;
4798
4799         /* add authentication parameters */
4800         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4801                 /* attach RANDOM parameter, if available */
4802                 if (stcb->asoc.authinfo.random != NULL) {
4803                         struct sctp_auth_random *randp;
4804
4805                         if (padding_len > 0) {
4806                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4807                                 chunk_len += padding_len;
4808                                 padding_len = 0;
4809                         }
4810                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
4811                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
4812                         /* random key already contains the header */
4813                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
4814                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4815                         chunk_len += parameter_len;
4816                 }
4817                 /* add HMAC_ALGO parameter */
4818                 if ((stcb->asoc.local_hmacs != NULL) &&
4819                     (stcb->asoc.local_hmacs->num_algo > 0)) {
4820                         struct sctp_auth_hmac_algo *hmacs;
4821
4822                         if (padding_len > 0) {
4823                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4824                                 chunk_len += padding_len;
4825                                 padding_len = 0;
4826                         }
4827                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
4828                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
4829                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
4830                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4831                         hmacs->ph.param_length = htons(parameter_len);
4832                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
4833                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4834                         chunk_len += parameter_len;
4835                 }
4836                 /* add CHUNKS parameter */
4837                 if (sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks) > 0) {
4838                         struct sctp_auth_chunk_list *chunks;
4839
4840                         if (padding_len > 0) {
4841                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
4842                                 chunk_len += padding_len;
4843                                 padding_len = 0;
4844                         }
4845                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
4846                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
4847                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
4848                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4849                         chunks->ph.param_length = htons(parameter_len);
4850                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
4851                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
4852                         chunk_len += parameter_len;
4853                 }
4854         }
4855         SCTP_BUF_LEN(m) = chunk_len;
4856
4857         /* now the addresses */
4858         /*
4859          * To optimize this we could put the scoping stuff into a structure
4860          * and remove the individual uint8's from the assoc structure. Then
4861          * we could just sifa in the address within the stcb. But for now
4862          * this is a quick hack to get the address stuff teased apart.
4863          */
4864         scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4865         scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4866         scp.loopback_scope = stcb->asoc.loopback_scope;
4867         scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4868         scp.local_scope = stcb->asoc.local_scope;
4869         scp.site_scope = stcb->asoc.site_scope;
4870         sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to, &padding_len, &chunk_len);
4871
4872         init->ch.chunk_length = htons(chunk_len);
4873         if (padding_len > 0) {
4874                 struct mbuf *m_at, *mp_last;
4875
4876                 mp_last = NULL;
4877                 for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4878                         if (SCTP_BUF_NEXT(m_at) == NULL)
4879                                 mp_last = m_at;
4880                 }
4881                 if ((mp_last == NULL) || sctp_add_pad_tombuf(mp_last, padding_len)) {
4882                         sctp_m_freem(m);
4883                         return;
4884                 }
4885         }
4886         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4887         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4888             (struct sockaddr *)&net->ro._l_addr,
4889             m, 0, NULL, 0, 0, 0, 0,
4890             inp->sctp_lport, stcb->rport, htonl(0),
4891             net->port, NULL,
4892             0, 0,
4893             so_locked);
4894         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4895         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4896         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4897 }
4898
4899 struct mbuf *
4900 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4901     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4902 {
4903         /*
4904          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4905          * being equal to the beginning of the params i.e. (iphlen +
4906          * sizeof(struct sctp_init_msg) parse through the parameters to the
4907          * end of the mbuf verifying that all parameters are known.
4908          *
4909          * For unknown parameters build and return a mbuf with
4910          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4911          * processing this chunk stop, and set *abort_processing to 1.
4912          *
4913          * By having param_offset be pre-set to where parameters begin it is
4914          * hoped that this routine may be reused in the future by new
4915          * features.
4916          */
4917         struct sctp_paramhdr *phdr, params;
4918
4919         struct mbuf *mat, *op_err;
4920         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4921         int at, limit, pad_needed;
4922         uint16_t ptype, plen, padded_size;
4923         int err_at;
4924
4925         *abort_processing = 0;
4926         mat = in_initpkt;
4927         err_at = 0;
4928         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4929         at = param_offset;
4930         op_err = NULL;
4931         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4932         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4933         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4934                 ptype = ntohs(phdr->param_type);
4935                 plen = ntohs(phdr->param_length);
4936                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4937                         /* wacked parameter */
4938                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4939                         goto invalid_size;
4940                 }
4941                 limit -= SCTP_SIZE32(plen);
4942                 /*-
4943                  * All parameters for all chunks that we know/understand are
4944                  * listed here. We process them other places and make
4945                  * appropriate stop actions per the upper bits. However this
4946                  * is the generic routine processor's can call to get back
4947                  * an operr.. to either incorporate (init-ack) or send.
4948                  */
4949                 padded_size = SCTP_SIZE32(plen);
4950                 switch (ptype) {
4951                         /* Param's with variable size */
4952                 case SCTP_HEARTBEAT_INFO:
4953                 case SCTP_STATE_COOKIE:
4954                 case SCTP_UNRECOG_PARAM:
4955                 case SCTP_ERROR_CAUSE_IND:
4956                         /* ok skip fwd */
4957                         at += padded_size;
4958                         break;
4959                         /* Param's with variable size within a range */
4960                 case SCTP_CHUNK_LIST:
4961                 case SCTP_SUPPORTED_CHUNK_EXT:
4962                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4963                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4964                                 goto invalid_size;
4965                         }
4966                         at += padded_size;
4967                         break;
4968                 case SCTP_SUPPORTED_ADDRTYPE:
4969                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4970                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4971                                 goto invalid_size;
4972                         }
4973                         at += padded_size;
4974                         break;
4975                 case SCTP_RANDOM:
4976                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4977                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4978                                 goto invalid_size;
4979                         }
4980                         at += padded_size;
4981                         break;
4982                 case SCTP_SET_PRIM_ADDR:
4983                 case SCTP_DEL_IP_ADDRESS:
4984                 case SCTP_ADD_IP_ADDRESS:
4985                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4986                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4987                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4988                                 goto invalid_size;
4989                         }
4990                         at += padded_size;
4991                         break;
4992                         /* Param's with a fixed size */
4993                 case SCTP_IPV4_ADDRESS:
4994                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4995                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4996                                 goto invalid_size;
4997                         }
4998                         at += padded_size;
4999                         break;
5000                 case SCTP_IPV6_ADDRESS:
5001                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
5002                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
5003                                 goto invalid_size;
5004                         }
5005                         at += padded_size;
5006                         break;
5007                 case SCTP_COOKIE_PRESERVE:
5008                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
5009                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
5010                                 goto invalid_size;
5011                         }
5012                         at += padded_size;
5013                         break;
5014                 case SCTP_HAS_NAT_SUPPORT:
5015                         *nat_friendly = 1;
5016                         /* fall through */
5017                 case SCTP_PRSCTP_SUPPORTED:
5018
5019                         if (padded_size != sizeof(struct sctp_paramhdr)) {
5020                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
5021                                 goto invalid_size;
5022                         }
5023                         at += padded_size;
5024                         break;
5025                 case SCTP_ECN_CAPABLE:
5026                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
5027                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
5028                                 goto invalid_size;
5029                         }
5030                         at += padded_size;
5031                         break;
5032                 case SCTP_ULP_ADAPTATION:
5033                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
5034                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
5035                                 goto invalid_size;
5036                         }
5037                         at += padded_size;
5038                         break;
5039                 case SCTP_SUCCESS_REPORT:
5040                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5041                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5042                                 goto invalid_size;
5043                         }
5044                         at += padded_size;
5045                         break;
5046                 case SCTP_HOSTNAME_ADDRESS:
5047                         {
5048                                 /* We can NOT handle HOST NAME addresses!! */
5049                                 int l_len;
5050
5051                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5052                                 *abort_processing = 1;
5053                                 if (op_err == NULL) {
5054                                         /* Ok need to try to get a mbuf */
5055 #ifdef INET6
5056                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5057 #else
5058                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5059 #endif
5060                                         l_len += plen;
5061                                         l_len += sizeof(struct sctp_paramhdr);
5062                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5063                                         if (op_err) {
5064                                                 SCTP_BUF_LEN(op_err) = 0;
5065                                                 /*
5066                                                  * pre-reserve space for ip
5067                                                  * and sctp header  and
5068                                                  * chunk hdr
5069                                                  */
5070 #ifdef INET6
5071                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5072 #else
5073                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5074 #endif
5075                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5076                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5077                                         }
5078                                 }
5079                                 if (op_err) {
5080                                         /* If we have space */
5081                                         struct sctp_paramhdr s;
5082
5083                                         if (err_at % 4) {
5084                                                 uint32_t cpthis = 0;
5085
5086                                                 pad_needed = 4 - (err_at % 4);
5087                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5088                                                 err_at += pad_needed;
5089                                         }
5090                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5091                                         s.param_length = htons(sizeof(s) + plen);
5092                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5093                                         err_at += sizeof(s);
5094                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5095                                         if (phdr == NULL) {
5096                                                 sctp_m_freem(op_err);
5097                                                 /*
5098                                                  * we are out of memory but
5099                                                  * we still need to have a
5100                                                  * look at what to do (the
5101                                                  * system is in trouble
5102                                                  * though).
5103                                                  */
5104                                                 return (NULL);
5105                                         }
5106                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5107                                 }
5108                                 return (op_err);
5109                                 break;
5110                         }
5111                 default:
5112                         /*
5113                          * we do not recognize the parameter figure out what
5114                          * we do.
5115                          */
5116                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5117                         if ((ptype & 0x4000) == 0x4000) {
5118                                 /* Report bit is set?? */
5119                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5120                                 if (op_err == NULL) {
5121                                         int l_len;
5122
5123                                         /* Ok need to try to get an mbuf */
5124 #ifdef INET6
5125                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5126 #else
5127                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5128 #endif
5129                                         l_len += plen;
5130                                         l_len += sizeof(struct sctp_paramhdr);
5131                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5132                                         if (op_err) {
5133                                                 SCTP_BUF_LEN(op_err) = 0;
5134 #ifdef INET6
5135                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5136 #else
5137                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5138 #endif
5139                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5140                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5141                                         }
5142                                 }
5143                                 if (op_err) {
5144                                         /* If we have space */
5145                                         struct sctp_paramhdr s;
5146
5147                                         if (err_at % 4) {
5148                                                 uint32_t cpthis = 0;
5149
5150                                                 pad_needed = 4 - (err_at % 4);
5151                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5152                                                 err_at += pad_needed;
5153                                         }
5154                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5155                                         s.param_length = htons(sizeof(s) + plen);
5156                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5157                                         err_at += sizeof(s);
5158                                         if (plen > sizeof(tempbuf)) {
5159                                                 plen = sizeof(tempbuf);
5160                                         }
5161                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5162                                         if (phdr == NULL) {
5163                                                 sctp_m_freem(op_err);
5164                                                 /*
5165                                                  * we are out of memory but
5166                                                  * we still need to have a
5167                                                  * look at what to do (the
5168                                                  * system is in trouble
5169                                                  * though).
5170                                                  */
5171                                                 op_err = NULL;
5172                                                 goto more_processing;
5173                                         }
5174                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5175                                         err_at += plen;
5176                                 }
5177                         }
5178         more_processing:
5179                         if ((ptype & 0x8000) == 0x0000) {
5180                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5181                                 return (op_err);
5182                         } else {
5183                                 /* skip this chunk and continue processing */
5184                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5185                                 at += SCTP_SIZE32(plen);
5186                         }
5187                         break;
5188
5189                 }
5190                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5191         }
5192         return (op_err);
5193 invalid_size:
5194         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5195         *abort_processing = 1;
5196         if ((op_err == NULL) && phdr) {
5197                 int l_len;
5198
5199 #ifdef INET6
5200                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5201 #else
5202                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5203 #endif
5204                 l_len += (2 * sizeof(struct sctp_paramhdr));
5205                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5206                 if (op_err) {
5207                         SCTP_BUF_LEN(op_err) = 0;
5208 #ifdef INET6
5209                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5210 #else
5211                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5212 #endif
5213                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5214                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5215                 }
5216         }
5217         if ((op_err) && phdr) {
5218                 struct sctp_paramhdr s;
5219
5220                 if (err_at % 4) {
5221                         uint32_t cpthis = 0;
5222
5223                         pad_needed = 4 - (err_at % 4);
5224                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5225                         err_at += pad_needed;
5226                 }
5227                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5228                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5229                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5230                 err_at += sizeof(s);
5231                 /* Only copy back the p-hdr that caused the issue */
5232                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5233         }
5234         return (op_err);
5235 }
5236
5237 static int
5238 sctp_are_there_new_addresses(struct sctp_association *asoc,
5239     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5240 {
5241         /*
5242          * Given a INIT packet, look through the packet to verify that there
5243          * are NO new addresses. As we go through the parameters add reports
5244          * of any un-understood parameters that require an error.  Also we
5245          * must return (1) to drop the packet if we see a un-understood
5246          * parameter that tells us to drop the chunk.
5247          */
5248         struct sockaddr *sa_touse;
5249         struct sockaddr *sa;
5250         struct sctp_paramhdr *phdr, params;
5251         uint16_t ptype, plen;
5252         uint8_t fnd;
5253         struct sctp_nets *net;
5254
5255 #ifdef INET
5256         struct sockaddr_in sin4, *sa4;
5257
5258 #endif
5259 #ifdef INET6
5260         struct sockaddr_in6 sin6, *sa6;
5261
5262 #endif
5263
5264 #ifdef INET
5265         memset(&sin4, 0, sizeof(sin4));
5266         sin4.sin_family = AF_INET;
5267         sin4.sin_len = sizeof(sin4);
5268 #endif
5269 #ifdef INET6
5270         memset(&sin6, 0, sizeof(sin6));
5271         sin6.sin6_family = AF_INET6;
5272         sin6.sin6_len = sizeof(sin6);
5273 #endif
5274         /* First what about the src address of the pkt ? */
5275         fnd = 0;
5276         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5277                 sa = (struct sockaddr *)&net->ro._l_addr;
5278                 if (sa->sa_family == src->sa_family) {
5279 #ifdef INET
5280                         if (sa->sa_family == AF_INET) {
5281                                 struct sockaddr_in *src4;
5282
5283                                 sa4 = (struct sockaddr_in *)sa;
5284                                 src4 = (struct sockaddr_in *)src;
5285                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5286                                         fnd = 1;
5287                                         break;
5288                                 }
5289                         }
5290 #endif
5291 #ifdef INET6
5292                         if (sa->sa_family == AF_INET6) {
5293                                 struct sockaddr_in6 *src6;
5294
5295                                 sa6 = (struct sockaddr_in6 *)sa;
5296                                 src6 = (struct sockaddr_in6 *)src;
5297                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5298                                         fnd = 1;
5299                                         break;
5300                                 }
5301                         }
5302 #endif
5303                 }
5304         }
5305         if (fnd == 0) {
5306                 /* New address added! no need to look futher. */
5307                 return (1);
5308         }
5309         /* Ok so far lets munge through the rest of the packet */
5310         offset += sizeof(struct sctp_init_chunk);
5311         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5312         while (phdr) {
5313                 sa_touse = NULL;
5314                 ptype = ntohs(phdr->param_type);
5315                 plen = ntohs(phdr->param_length);
5316                 switch (ptype) {
5317 #ifdef INET
5318                 case SCTP_IPV4_ADDRESS:
5319                         {
5320                                 struct sctp_ipv4addr_param *p4, p4_buf;
5321
5322                                 phdr = sctp_get_next_param(in_initpkt, offset,
5323                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5324                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5325                                     phdr == NULL) {
5326                                         return (1);
5327                                 }
5328                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5329                                 sin4.sin_addr.s_addr = p4->addr;
5330                                 sa_touse = (struct sockaddr *)&sin4;
5331                                 break;
5332                         }
5333 #endif
5334 #ifdef INET6
5335                 case SCTP_IPV6_ADDRESS:
5336                         {
5337                                 struct sctp_ipv6addr_param *p6, p6_buf;
5338
5339                                 phdr = sctp_get_next_param(in_initpkt, offset,
5340                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5341                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5342                                     phdr == NULL) {
5343                                         return (1);
5344                                 }
5345                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5346                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5347                                     sizeof(p6->addr));
5348                                 sa_touse = (struct sockaddr *)&sin6;
5349                                 break;
5350                         }
5351 #endif
5352                 default:
5353                         sa_touse = NULL;
5354                         break;
5355                 }
5356                 if (sa_touse) {
5357                         /* ok, sa_touse points to one to check */
5358                         fnd = 0;
5359                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5360                                 sa = (struct sockaddr *)&net->ro._l_addr;
5361                                 if (sa->sa_family != sa_touse->sa_family) {
5362                                         continue;
5363                                 }
5364 #ifdef INET
5365                                 if (sa->sa_family == AF_INET) {
5366                                         sa4 = (struct sockaddr_in *)sa;
5367                                         if (sa4->sin_addr.s_addr ==
5368                                             sin4.sin_addr.s_addr) {
5369                                                 fnd = 1;
5370                                                 break;
5371                                         }
5372                                 }
5373 #endif
5374 #ifdef INET6
5375                                 if (sa->sa_family == AF_INET6) {
5376                                         sa6 = (struct sockaddr_in6 *)sa;
5377                                         if (SCTP6_ARE_ADDR_EQUAL(
5378                                             sa6, &sin6)) {
5379                                                 fnd = 1;
5380                                                 break;
5381                                         }
5382                                 }
5383 #endif
5384                         }
5385                         if (!fnd) {
5386                                 /* New addr added! no need to look further */
5387                                 return (1);
5388                         }
5389                 }
5390                 offset += SCTP_SIZE32(plen);
5391                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5392         }
5393         return (0);
5394 }
5395
5396 /*
5397  * Given a MBUF chain that was sent into us containing an INIT. Build a
5398  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5399  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5400  * message (i.e. the struct sctp_init_msg).
5401  */
5402 void
5403 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5404     struct mbuf *init_pkt, int iphlen, int offset,
5405     struct sockaddr *src, struct sockaddr *dst,
5406     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5407     uint8_t use_mflowid, uint32_t mflowid,
5408     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5409 {
5410         struct sctp_association *asoc;
5411         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5412         struct sctp_init_ack_chunk *initack;
5413         struct sctp_adaptation_layer_indication *ali;
5414         struct sctp_ecn_supported_param *ecn;
5415         struct sctp_prsctp_supported_param *prsctp;
5416         struct sctp_supported_chunk_types_param *pr_supported;
5417         union sctp_sockstore *over_addr;
5418
5419 #ifdef INET
5420         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5421         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5422         struct sockaddr_in *sin;
5423
5424 #endif
5425 #ifdef INET6
5426         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5427         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5428         struct sockaddr_in6 *sin6;
5429
5430 #endif
5431         struct sockaddr *to;
5432         struct sctp_state_cookie stc;
5433         struct sctp_nets *net = NULL;
5434         uint8_t *signature = NULL;
5435         int cnt_inits_to = 0;
5436         uint16_t his_limit, i_want;
5437         int abort_flag, padval;
5438         int num_ext;
5439         int p_len;
5440         int nat_friendly = 0;
5441         struct socket *so;
5442
5443         if (stcb) {
5444                 asoc = &stcb->asoc;
5445         } else {
5446                 asoc = NULL;
5447         }
5448         mp_last = NULL;
5449         if ((asoc != NULL) &&
5450             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5451             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5452                 /* new addresses, out of here in non-cookie-wait states */
5453                 /*
5454                  * Send a ABORT, we don't add the new address error clause
5455                  * though we even set the T bit and copy in the 0 tag.. this
5456                  * looks no different than if no listener was present.
5457                  */
5458                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, NULL,
5459                     use_mflowid, mflowid,
5460                     vrf_id, port);
5461                 return;
5462         }
5463         abort_flag = 0;
5464         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5465             (offset + sizeof(struct sctp_init_chunk)),
5466             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5467         if (abort_flag) {
5468 do_a_abort:
5469                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5470                     init_chk->init.initiate_tag, op_err,
5471                     use_mflowid, mflowid,
5472                     vrf_id, port);
5473                 return;
5474         }
5475         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5476         if (m == NULL) {
5477                 /* No memory, INIT timer will re-attempt. */
5478                 if (op_err)
5479                         sctp_m_freem(op_err);
5480                 return;
5481         }
5482         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5483
5484         /* the time I built cookie */
5485         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5486
5487         /* populate any tie tags */
5488         if (asoc != NULL) {
5489                 /* unlock before tag selections */
5490                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5491                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5492                 stc.cookie_life = asoc->cookie_life;
5493                 net = asoc->primary_destination;
5494         } else {
5495                 stc.tie_tag_my_vtag = 0;
5496                 stc.tie_tag_peer_vtag = 0;
5497                 /* life I will award this cookie */
5498                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5499         }
5500
5501         /* copy in the ports for later check */
5502         stc.myport = sh->dest_port;
5503         stc.peerport = sh->src_port;
5504
5505         /*
5506          * If we wanted to honor cookie life extentions, we would add to
5507          * stc.cookie_life. For now we should NOT honor any extension
5508          */
5509         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5510         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5511                 struct inpcb *in_inp;
5512
5513                 /* Its a V6 socket */
5514                 in_inp = (struct inpcb *)inp;
5515                 stc.ipv6_addr_legal = 1;
5516                 /* Now look at the binding flag to see if V4 will be legal */
5517                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5518                         stc.ipv4_addr_legal = 1;
5519                 } else {
5520                         /* V4 addresses are NOT legal on the association */
5521                         stc.ipv4_addr_legal = 0;
5522                 }
5523         } else {
5524                 /* Its a V4 socket, no - V6 */
5525                 stc.ipv4_addr_legal = 1;
5526                 stc.ipv6_addr_legal = 0;
5527         }
5528
5529 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5530         stc.ipv4_scope = 1;
5531 #else
5532         stc.ipv4_scope = 0;
5533 #endif
5534         if (net == NULL) {
5535                 to = src;
5536                 switch (dst->sa_family) {
5537 #ifdef INET
5538                 case AF_INET:
5539                         {
5540                                 /* lookup address */
5541                                 stc.address[0] = src4->sin_addr.s_addr;
5542                                 stc.address[1] = 0;
5543                                 stc.address[2] = 0;
5544                                 stc.address[3] = 0;
5545                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5546                                 /* local from address */
5547                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5548                                 stc.laddress[1] = 0;
5549                                 stc.laddress[2] = 0;
5550                                 stc.laddress[3] = 0;
5551                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5552                                 /* scope_id is only for v6 */
5553                                 stc.scope_id = 0;
5554 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5555                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5556                                         stc.ipv4_scope = 1;
5557                                 }
5558 #else
5559                                 stc.ipv4_scope = 1;
5560 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5561                                 /* Must use the address in this case */
5562                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5563                                         stc.loopback_scope = 1;
5564                                         stc.ipv4_scope = 1;
5565                                         stc.site_scope = 1;
5566                                         stc.local_scope = 0;
5567                                 }
5568                                 break;
5569                         }
5570 #endif
5571 #ifdef INET6
5572                 case AF_INET6:
5573                         {
5574                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5575                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5576                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5577                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5578                                         stc.loopback_scope = 1;
5579                                         stc.local_scope = 0;
5580                                         stc.site_scope = 1;
5581                                         stc.ipv4_scope = 1;
5582                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5583                                         /*
5584                                          * If the new destination is a
5585                                          * LINK_LOCAL we must have common
5586                                          * both site and local scope. Don't
5587                                          * set local scope though since we
5588                                          * must depend on the source to be
5589                                          * added implicitly. We cannot
5590                                          * assure just because we share one
5591                                          * link that all links are common.
5592                                          */
5593                                         stc.local_scope = 0;
5594                                         stc.site_scope = 1;
5595                                         stc.ipv4_scope = 1;
5596                                         /*
5597                                          * we start counting for the private
5598                                          * address stuff at 1. since the
5599                                          * link local we source from won't
5600                                          * show up in our scoped count.
5601                                          */
5602                                         cnt_inits_to = 1;
5603                                         /*
5604                                          * pull out the scope_id from
5605                                          * incoming pkt
5606                                          */
5607                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5608                                         /*
5609                                          * If the new destination is
5610                                          * SITE_LOCAL then we must have site
5611                                          * scope in common.
5612                                          */
5613                                         stc.site_scope = 1;
5614                                 }
5615                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5616                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5617                                 break;
5618                         }
5619 #endif
5620                 default:
5621                         /* TSNH */
5622                         goto do_a_abort;
5623                         break;
5624                 }
5625         } else {
5626                 /* set the scope per the existing tcb */
5627
5628 #ifdef INET6
5629                 struct sctp_nets *lnet;
5630
5631 #endif
5632
5633                 stc.loopback_scope = asoc->loopback_scope;
5634                 stc.ipv4_scope = asoc->ipv4_local_scope;
5635                 stc.site_scope = asoc->site_scope;
5636                 stc.local_scope = asoc->local_scope;
5637 #ifdef INET6
5638                 /* Why do we not consider IPv4 LL addresses? */
5639                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5640                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5641                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5642                                         /*
5643                                          * if we have a LL address, start
5644                                          * counting at 1.
5645                                          */
5646                                         cnt_inits_to = 1;
5647                                 }
5648                         }
5649                 }
5650 #endif
5651                 /* use the net pointer */
5652                 to = (struct sockaddr *)&net->ro._l_addr;
5653                 switch (to->sa_family) {
5654 #ifdef INET
5655                 case AF_INET:
5656                         sin = (struct sockaddr_in *)to;
5657                         stc.address[0] = sin->sin_addr.s_addr;
5658                         stc.address[1] = 0;
5659                         stc.address[2] = 0;
5660                         stc.address[3] = 0;
5661                         stc.addr_type = SCTP_IPV4_ADDRESS;
5662                         if (net->src_addr_selected == 0) {
5663                                 /*
5664                                  * strange case here, the INIT should have
5665                                  * did the selection.
5666                                  */
5667                                 net->ro._s_addr = sctp_source_address_selection(inp,
5668                                     stcb, (sctp_route_t *) & net->ro,
5669                                     net, 0, vrf_id);
5670                                 if (net->ro._s_addr == NULL)
5671                                         return;
5672
5673                                 net->src_addr_selected = 1;
5674
5675                         }
5676                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5677                         stc.laddress[1] = 0;
5678                         stc.laddress[2] = 0;
5679                         stc.laddress[3] = 0;
5680                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5681                         /* scope_id is only for v6 */
5682                         stc.scope_id = 0;
5683                         break;
5684 #endif
5685 #ifdef INET6
5686                 case AF_INET6:
5687                         sin6 = (struct sockaddr_in6 *)to;
5688                         memcpy(&stc.address, &sin6->sin6_addr,
5689                             sizeof(struct in6_addr));
5690                         stc.addr_type = SCTP_IPV6_ADDRESS;
5691                         stc.scope_id = sin6->sin6_scope_id;
5692                         if (net->src_addr_selected == 0) {
5693                                 /*
5694                                  * strange case here, the INIT should have
5695                                  * done the selection.
5696                                  */
5697                                 net->ro._s_addr = sctp_source_address_selection(inp,
5698                                     stcb, (sctp_route_t *) & net->ro,
5699                                     net, 0, vrf_id);
5700                                 if (net->ro._s_addr == NULL)
5701                                         return;
5702
5703                                 net->src_addr_selected = 1;
5704                         }
5705                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5706                             sizeof(struct in6_addr));
5707                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5708                         break;
5709 #endif
5710                 }
5711         }
5712         /* Now lets put the SCTP header in place */
5713         initack = mtod(m, struct sctp_init_ack_chunk *);
5714         /* Save it off for quick ref */
5715         stc.peers_vtag = init_chk->init.initiate_tag;
5716         /* who are we */
5717         memcpy(stc.identification, SCTP_VERSION_STRING,
5718             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5719         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5720         /* now the chunk header */
5721         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5722         initack->ch.chunk_flags = 0;
5723         /* fill in later from mbuf we build */
5724         initack->ch.chunk_length = 0;
5725         /* place in my tag */
5726         if ((asoc != NULL) &&
5727             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5728             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5729             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5730                 /* re-use the v-tags and init-seq here */
5731                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5732                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5733         } else {
5734                 uint32_t vtag, itsn;
5735
5736                 if (hold_inp_lock) {
5737                         SCTP_INP_INCR_REF(inp);
5738                         SCTP_INP_RUNLOCK(inp);
5739                 }
5740                 if (asoc) {
5741                         atomic_add_int(&asoc->refcnt, 1);
5742                         SCTP_TCB_UNLOCK(stcb);
5743         new_tag:
5744                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5745                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5746                                 /*
5747                                  * Got a duplicate vtag on some guy behind a
5748                                  * nat make sure we don't use it.
5749                                  */
5750                                 goto new_tag;
5751                         }
5752                         initack->init.initiate_tag = htonl(vtag);
5753                         /* get a TSN to use too */
5754                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5755                         initack->init.initial_tsn = htonl(itsn);
5756                         SCTP_TCB_LOCK(stcb);
5757                         atomic_add_int(&asoc->refcnt, -1);
5758                 } else {
5759                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5760                         initack->init.initiate_tag = htonl(vtag);
5761                         /* get a TSN to use too */
5762                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5763                 }
5764                 if (hold_inp_lock) {
5765                         SCTP_INP_RLOCK(inp);
5766                         SCTP_INP_DECR_REF(inp);
5767                 }
5768         }
5769         /* save away my tag to */
5770         stc.my_vtag = initack->init.initiate_tag;
5771
5772         /* set up some of the credits. */
5773         so = inp->sctp_socket;
5774         if (so == NULL) {
5775                 /* memory problem */
5776                 sctp_m_freem(m);
5777                 return;
5778         } else {
5779                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5780         }
5781         /* set what I want */
5782         his_limit = ntohs(init_chk->init.num_inbound_streams);
5783         /* choose what I want */
5784         if (asoc != NULL) {
5785                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5786                         i_want = asoc->streamoutcnt;
5787                 } else {
5788                         i_want = inp->sctp_ep.pre_open_stream_count;
5789                 }
5790         } else {
5791                 i_want = inp->sctp_ep.pre_open_stream_count;
5792         }
5793         if (his_limit < i_want) {
5794                 /* I Want more :< */
5795                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5796         } else {
5797                 /* I can have what I want :> */
5798                 initack->init.num_outbound_streams = htons(i_want);
5799         }
5800         /* tell him his limit. */
5801         initack->init.num_inbound_streams =
5802             htons(inp->sctp_ep.max_open_streams_intome);
5803
5804         /* adaptation layer indication parameter */
5805         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5806         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5807         ali->ph.param_length = htons(sizeof(*ali));
5808         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5809         SCTP_BUF_LEN(m) += sizeof(*ali);
5810         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5811
5812         /* ECN parameter */
5813         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5814             (inp->sctp_ecn_enable == 1)) {
5815                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5816                 ecn->ph.param_length = htons(sizeof(*ecn));
5817                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5818
5819                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5820                     sizeof(*ecn));
5821         } else {
5822                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5823         }
5824         /* And now tell the peer we do  pr-sctp */
5825         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5826         prsctp->ph.param_length = htons(sizeof(*prsctp));
5827         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5828         if (nat_friendly) {
5829                 /* Add NAT friendly parameter */
5830                 struct sctp_paramhdr *ph;
5831
5832                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5833                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5834                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5835                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5836         }
5837         /* And now tell the peer we do all the extensions */
5838         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5839         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5840         num_ext = 0;
5841         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5842         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5843         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5844         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5845         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5846         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5847                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5848         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5849                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5850         p_len = sizeof(*pr_supported) + num_ext;
5851         pr_supported->ph.param_length = htons(p_len);
5852         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5853         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5854
5855         /* add authentication parameters */
5856         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5857                 struct sctp_auth_random *randp;
5858                 struct sctp_auth_hmac_algo *hmacs;
5859                 struct sctp_auth_chunk_list *chunks;
5860                 uint16_t random_len;
5861
5862                 /* generate and add RANDOM parameter */
5863                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5864                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5865                 randp->ph.param_type = htons(SCTP_RANDOM);
5866                 p_len = sizeof(*randp) + random_len;
5867                 randp->ph.param_length = htons(p_len);
5868                 SCTP_READ_RANDOM(randp->random_data, random_len);
5869                 /* zero out any padding required */
5870                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5871                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5872
5873                 /* add HMAC_ALGO parameter */
5874                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5875                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5876                     (uint8_t *) hmacs->hmac_ids);
5877                 if (p_len > 0) {
5878                         p_len += sizeof(*hmacs);
5879                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5880                         hmacs->ph.param_length = htons(p_len);
5881                         /* zero out any padding required */
5882                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5883                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5884                 }
5885                 /* add CHUNKS parameter */
5886                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5887                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5888                     chunks->chunk_types);
5889                 if (p_len > 0) {
5890                         p_len += sizeof(*chunks);
5891                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5892                         chunks->ph.param_length = htons(p_len);
5893                         /* zero out any padding required */
5894                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5895                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5896                 }
5897         }
5898         m_at = m;
5899         /* now the addresses */
5900         {
5901                 struct sctp_scoping scp;
5902
5903                 /*
5904                  * To optimize this we could put the scoping stuff into a
5905                  * structure and remove the individual uint8's from the stc
5906                  * structure. Then we could just sifa in the address within
5907                  * the stc.. but for now this is a quick hack to get the
5908                  * address stuff teased apart.
5909                  */
5910                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5911                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5912                 scp.loopback_scope = stc.loopback_scope;
5913                 scp.ipv4_local_scope = stc.ipv4_scope;
5914                 scp.local_scope = stc.local_scope;
5915                 scp.site_scope = stc.site_scope;
5916                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to, NULL, NULL);
5917         }
5918
5919         /* tack on the operational error if present */
5920         if (op_err) {
5921                 struct mbuf *ol;
5922                 int llen;
5923
5924                 llen = 0;
5925                 ol = op_err;
5926
5927                 while (ol) {
5928                         llen += SCTP_BUF_LEN(ol);
5929                         ol = SCTP_BUF_NEXT(ol);
5930                 }
5931                 if (llen % 4) {
5932                         /* must add a pad to the param */
5933                         uint32_t cpthis = 0;
5934                         int padlen;
5935
5936                         padlen = 4 - (llen % 4);
5937                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5938                 }
5939                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5940                         m_at = SCTP_BUF_NEXT(m_at);
5941                 }
5942                 SCTP_BUF_NEXT(m_at) = op_err;
5943                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5944                         m_at = SCTP_BUF_NEXT(m_at);
5945                 }
5946         }
5947         /* pre-calulate the size and update pkt header and chunk header */
5948         p_len = 0;
5949         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5950                 p_len += SCTP_BUF_LEN(m_tmp);
5951                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5952                         /* m_tmp should now point to last one */
5953                         break;
5954                 }
5955         }
5956
5957         /* Now we must build a cookie */
5958         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5959         if (m_cookie == NULL) {
5960                 /* memory problem */
5961                 sctp_m_freem(m);
5962                 return;
5963         }
5964         /* Now append the cookie to the end and update the space/size */
5965         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5966
5967         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5968                 p_len += SCTP_BUF_LEN(m_tmp);
5969                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5970                         /* m_tmp should now point to last one */
5971                         mp_last = m_tmp;
5972                         break;
5973                 }
5974         }
5975         /*
5976          * Place in the size, but we don't include the last pad (if any) in
5977          * the INIT-ACK.
5978          */
5979         initack->ch.chunk_length = htons(p_len);
5980
5981         /*
5982          * Time to sign the cookie, we don't sign over the cookie signature
5983          * though thus we set trailer.
5984          */
5985         (void)sctp_hmac_m(SCTP_HMAC,
5986             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5987             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5988             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5989         /*
5990          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5991          * here since the timer will drive a retranmission.
5992          */
5993         padval = p_len % 4;
5994         if ((padval) && (mp_last)) {
5995                 /* see my previous comments on mp_last */
5996                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
5997                         /* Houston we have a problem, no space */
5998                         sctp_m_freem(m);
5999                         return;
6000                 }
6001         }
6002         if (stc.loopback_scope) {
6003                 over_addr = (union sctp_sockstore *)dst;
6004         } else {
6005                 over_addr = NULL;
6006         }
6007
6008         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6009             0, 0,
6010             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6011             port, over_addr,
6012             use_mflowid, mflowid,
6013             SCTP_SO_NOT_LOCKED);
6014         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6015 }
6016
6017
6018 static void
6019 sctp_prune_prsctp(struct sctp_tcb *stcb,
6020     struct sctp_association *asoc,
6021     struct sctp_sndrcvinfo *srcv,
6022     int dataout)
6023 {
6024         int freed_spc = 0;
6025         struct sctp_tmit_chunk *chk, *nchk;
6026
6027         SCTP_TCB_LOCK_ASSERT(stcb);
6028         if ((asoc->peer_supports_prsctp) &&
6029             (asoc->sent_queue_cnt_removeable > 0)) {
6030                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6031                         /*
6032                          * Look for chunks marked with the PR_SCTP flag AND
6033                          * the buffer space flag. If the one being sent is
6034                          * equal or greater priority then purge the old one
6035                          * and free some space.
6036                          */
6037                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6038                                 /*
6039                                  * This one is PR-SCTP AND buffer space
6040                                  * limited type
6041                                  */
6042                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6043                                         /*
6044                                          * Lower numbers equates to higher
6045                                          * priority so if the one we are
6046                                          * looking at has a larger or equal
6047                                          * priority we want to drop the data
6048                                          * and NOT retransmit it.
6049                                          */
6050                                         if (chk->data) {
6051                                                 /*
6052                                                  * We release the book_size
6053                                                  * if the mbuf is here
6054                                                  */
6055                                                 int ret_spc;
6056                                                 uint8_t sent;
6057
6058                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6059                                                         sent = 1;
6060                                                 else
6061                                                         sent = 0;
6062                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6063                                                     sent,
6064                                                     SCTP_SO_LOCKED);
6065                                                 freed_spc += ret_spc;
6066                                                 if (freed_spc >= dataout) {
6067                                                         return;
6068                                                 }
6069                                         }       /* if chunk was present */
6070                                 }       /* if of sufficent priority */
6071                         }       /* if chunk has enabled */
6072                 }               /* tailqforeach */
6073
6074                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6075                         /* Here we must move to the sent queue and mark */
6076                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6077                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6078                                         if (chk->data) {
6079                                                 /*
6080                                                  * We release the book_size
6081                                                  * if the mbuf is here
6082                                                  */
6083                                                 int ret_spc;
6084
6085                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6086                                                     0, SCTP_SO_LOCKED);
6087
6088                                                 freed_spc += ret_spc;
6089                                                 if (freed_spc >= dataout) {
6090                                                         return;
6091                                                 }
6092                                         }       /* end if chk->data */
6093                                 }       /* end if right class */
6094                         }       /* end if chk pr-sctp */
6095                 }               /* tailqforeachsafe (chk) */
6096         }                       /* if enabled in asoc */
6097 }
6098
6099 int
6100 sctp_get_frag_point(struct sctp_tcb *stcb,
6101     struct sctp_association *asoc)
6102 {
6103         int siz, ovh;
6104
6105         /*
6106          * For endpoints that have both v6 and v4 addresses we must reserve
6107          * room for the ipv6 header, for those that are only dealing with V4
6108          * we use a larger frag point.
6109          */
6110         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6111                 ovh = SCTP_MED_OVERHEAD;
6112         } else {
6113                 ovh = SCTP_MED_V4_OVERHEAD;
6114         }
6115
6116         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6117                 siz = asoc->smallest_mtu - ovh;
6118         else
6119                 siz = (stcb->asoc.sctp_frag_point - ovh);
6120         /*
6121          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6122          */
6123         /* A data chunk MUST fit in a cluster */
6124         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6125         /* } */
6126
6127         /* adjust for an AUTH chunk if DATA requires auth */
6128         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6129                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6130
6131         if (siz % 4) {
6132                 /* make it an even word boundary please */
6133                 siz -= (siz % 4);
6134         }
6135         return (siz);
6136 }
6137
6138 static void
6139 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6140 {
6141         sp->pr_sctp_on = 0;
6142         /*
6143          * We assume that the user wants PR_SCTP_TTL if the user provides a
6144          * positive lifetime but does not specify any PR_SCTP policy. This
6145          * is a BAD assumption and causes problems at least with the
6146          * U-Vancovers MPI folks. I will change this to be no policy means
6147          * NO PR-SCTP.
6148          */
6149         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6150                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6151                 sp->pr_sctp_on = 1;
6152         } else {
6153                 return;
6154         }
6155         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6156         case CHUNK_FLAGS_PR_SCTP_BUF:
6157                 /*
6158                  * Time to live is a priority stored in tv_sec when doing
6159                  * the buffer drop thing.
6160                  */
6161                 sp->ts.tv_sec = sp->timetolive;
6162                 sp->ts.tv_usec = 0;
6163                 break;
6164         case CHUNK_FLAGS_PR_SCTP_TTL:
6165                 {
6166                         struct timeval tv;
6167
6168                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6169                         tv.tv_sec = sp->timetolive / 1000;
6170                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6171                         /*
6172                          * TODO sctp_constants.h needs alternative time
6173                          * macros when _KERNEL is undefined.
6174                          */
6175                         timevaladd(&sp->ts, &tv);
6176                 }
6177                 break;
6178         case CHUNK_FLAGS_PR_SCTP_RTX:
6179                 /*
6180                  * Time to live is a the number or retransmissions stored in
6181                  * tv_sec.
6182                  */
6183                 sp->ts.tv_sec = sp->timetolive;
6184                 sp->ts.tv_usec = 0;
6185                 break;
6186         default:
6187                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6188                     "Unknown PR_SCTP policy %u.\n",
6189                     PR_SCTP_POLICY(sp->sinfo_flags));
6190                 break;
6191         }
6192 }
6193
6194 static int
6195 sctp_msg_append(struct sctp_tcb *stcb,
6196     struct sctp_nets *net,
6197     struct mbuf *m,
6198     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6199 {
6200         int error = 0;
6201         struct mbuf *at;
6202         struct sctp_stream_queue_pending *sp = NULL;
6203         struct sctp_stream_out *strm;
6204
6205         /*
6206          * Given an mbuf chain, put it into the association send queue and
6207          * place it on the wheel
6208          */
6209         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6210                 /* Invalid stream number */
6211                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6212                 error = EINVAL;
6213                 goto out_now;
6214         }
6215         if ((stcb->asoc.stream_locked) &&
6216             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6217                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6218                 error = EINVAL;
6219                 goto out_now;
6220         }
6221         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6222         /* Now can we send this? */
6223         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6224             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6225             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6226             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6227                 /* got data while shutting down */
6228                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6229                 error = ECONNRESET;
6230                 goto out_now;
6231         }
6232         sctp_alloc_a_strmoq(stcb, sp);
6233         if (sp == NULL) {
6234                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6235                 error = ENOMEM;
6236                 goto out_now;
6237         }
6238         sp->sinfo_flags = srcv->sinfo_flags;
6239         sp->timetolive = srcv->sinfo_timetolive;
6240         sp->ppid = srcv->sinfo_ppid;
6241         sp->context = srcv->sinfo_context;
6242         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6243                 sp->net = net;
6244                 atomic_add_int(&sp->net->ref_count, 1);
6245         } else {
6246                 sp->net = NULL;
6247         }
6248         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6249         sp->stream = srcv->sinfo_stream;
6250         sp->msg_is_complete = 1;
6251         sp->sender_all_done = 1;
6252         sp->some_taken = 0;
6253         sp->data = m;
6254         sp->tail_mbuf = NULL;
6255         sctp_set_prsctp_policy(sp);
6256         /*
6257          * We could in theory (for sendall) sifa the length in, but we would
6258          * still have to hunt through the chain since we need to setup the
6259          * tail_mbuf
6260          */
6261         sp->length = 0;
6262         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6263                 if (SCTP_BUF_NEXT(at) == NULL)
6264                         sp->tail_mbuf = at;
6265                 sp->length += SCTP_BUF_LEN(at);
6266         }
6267         if (srcv->sinfo_keynumber_valid) {
6268                 sp->auth_keyid = srcv->sinfo_keynumber;
6269         } else {
6270                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6271         }
6272         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6273                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6274                 sp->holds_key_ref = 1;
6275         }
6276         if (hold_stcb_lock == 0) {
6277                 SCTP_TCB_SEND_LOCK(stcb);
6278         }
6279         sctp_snd_sb_alloc(stcb, sp->length);
6280         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6281         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6282         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6283         m = NULL;
6284         if (hold_stcb_lock == 0) {
6285                 SCTP_TCB_SEND_UNLOCK(stcb);
6286         }
6287 out_now:
6288         if (m) {
6289                 sctp_m_freem(m);
6290         }
6291         return (error);
6292 }
6293
6294
6295 static struct mbuf *
6296 sctp_copy_mbufchain(struct mbuf *clonechain,
6297     struct mbuf *outchain,
6298     struct mbuf **endofchain,
6299     int can_take_mbuf,
6300     int sizeofcpy,
6301     uint8_t copy_by_ref)
6302 {
6303         struct mbuf *m;
6304         struct mbuf *appendchain;
6305         caddr_t cp;
6306         int len;
6307
6308         if (endofchain == NULL) {
6309                 /* error */
6310 error_out:
6311                 if (outchain)
6312                         sctp_m_freem(outchain);
6313                 return (NULL);
6314         }
6315         if (can_take_mbuf) {
6316                 appendchain = clonechain;
6317         } else {
6318                 if (!copy_by_ref &&
6319                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6320                     ) {
6321                         /* Its not in a cluster */
6322                         if (*endofchain == NULL) {
6323                                 /* lets get a mbuf cluster */
6324                                 if (outchain == NULL) {
6325                                         /* This is the general case */
6326                         new_mbuf:
6327                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6328                                         if (outchain == NULL) {
6329                                                 goto error_out;
6330                                         }
6331                                         SCTP_BUF_LEN(outchain) = 0;
6332                                         *endofchain = outchain;
6333                                         /* get the prepend space */
6334                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6335                                 } else {
6336                                         /*
6337                                          * We really should not get a NULL
6338                                          * in endofchain
6339                                          */
6340                                         /* find end */
6341                                         m = outchain;
6342                                         while (m) {
6343                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6344                                                         *endofchain = m;
6345                                                         break;
6346                                                 }
6347                                                 m = SCTP_BUF_NEXT(m);
6348                                         }
6349                                         /* sanity */
6350                                         if (*endofchain == NULL) {
6351                                                 /*
6352                                                  * huh, TSNH XXX maybe we
6353                                                  * should panic
6354                                                  */
6355                                                 sctp_m_freem(outchain);
6356                                                 goto new_mbuf;
6357                                         }
6358                                 }
6359                                 /* get the new end of length */
6360                                 len = M_TRAILINGSPACE(*endofchain);
6361                         } else {
6362                                 /* how much is left at the end? */
6363                                 len = M_TRAILINGSPACE(*endofchain);
6364                         }
6365                         /* Find the end of the data, for appending */
6366                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6367
6368                         /* Now lets copy it out */
6369                         if (len >= sizeofcpy) {
6370                                 /* It all fits, copy it in */
6371                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6372                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6373                         } else {
6374                                 /* fill up the end of the chain */
6375                                 if (len > 0) {
6376                                         m_copydata(clonechain, 0, len, cp);
6377                                         SCTP_BUF_LEN((*endofchain)) += len;
6378                                         /* now we need another one */
6379                                         sizeofcpy -= len;
6380                                 }
6381                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6382                                 if (m == NULL) {
6383                                         /* We failed */
6384                                         goto error_out;
6385                                 }
6386                                 SCTP_BUF_NEXT((*endofchain)) = m;
6387                                 *endofchain = m;
6388                                 cp = mtod((*endofchain), caddr_t);
6389                                 m_copydata(clonechain, len, sizeofcpy, cp);
6390                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6391                         }
6392                         return (outchain);
6393                 } else {
6394                         /* copy the old fashion way */
6395                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6396 #ifdef SCTP_MBUF_LOGGING
6397                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6398                                 struct mbuf *mat;
6399
6400                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6401                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6402                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6403                                         }
6404                                 }
6405                         }
6406 #endif
6407                 }
6408         }
6409         if (appendchain == NULL) {
6410                 /* error */
6411                 if (outchain)
6412                         sctp_m_freem(outchain);
6413                 return (NULL);
6414         }
6415         if (outchain) {
6416                 /* tack on to the end */
6417                 if (*endofchain != NULL) {
6418                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6419                 } else {
6420                         m = outchain;
6421                         while (m) {
6422                                 if (SCTP_BUF_NEXT(m) == NULL) {
6423                                         SCTP_BUF_NEXT(m) = appendchain;
6424                                         break;
6425                                 }
6426                                 m = SCTP_BUF_NEXT(m);
6427                         }
6428                 }
6429                 /*
6430                  * save off the end and update the end-chain postion
6431                  */
6432                 m = appendchain;
6433                 while (m) {
6434                         if (SCTP_BUF_NEXT(m) == NULL) {
6435                                 *endofchain = m;
6436                                 break;
6437                         }
6438                         m = SCTP_BUF_NEXT(m);
6439                 }
6440                 return (outchain);
6441         } else {
6442                 /* save off the end and update the end-chain postion */
6443                 m = appendchain;
6444                 while (m) {
6445                         if (SCTP_BUF_NEXT(m) == NULL) {
6446                                 *endofchain = m;
6447                                 break;
6448                         }
6449                         m = SCTP_BUF_NEXT(m);
6450                 }
6451                 return (appendchain);
6452         }
6453 }
6454
6455 static int
6456 sctp_med_chunk_output(struct sctp_inpcb *inp,
6457     struct sctp_tcb *stcb,
6458     struct sctp_association *asoc,
6459     int *num_out,
6460     int *reason_code,
6461     int control_only, int from_where,
6462     struct timeval *now, int *now_filled, int frag_point, int so_locked
6463 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6464     SCTP_UNUSED
6465 #endif
6466 );
6467
6468 static void
6469 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6470     uint32_t val SCTP_UNUSED)
6471 {
6472         struct sctp_copy_all *ca;
6473         struct mbuf *m;
6474         int ret = 0;
6475         int added_control = 0;
6476         int un_sent, do_chunk_output = 1;
6477         struct sctp_association *asoc;
6478         struct sctp_nets *net;
6479
6480         ca = (struct sctp_copy_all *)ptr;
6481         if (ca->m == NULL) {
6482                 return;
6483         }
6484         if (ca->inp != inp) {
6485                 /* TSNH */
6486                 return;
6487         }
6488         if ((ca->m) && ca->sndlen) {
6489                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6490                 if (m == NULL) {
6491                         /* can't copy so we are done */
6492                         ca->cnt_failed++;
6493                         return;
6494                 }
6495 #ifdef SCTP_MBUF_LOGGING
6496                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6497                         struct mbuf *mat;
6498
6499                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6500                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6501                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6502                                 }
6503                         }
6504                 }
6505 #endif
6506         } else {
6507                 m = NULL;
6508         }
6509         SCTP_TCB_LOCK_ASSERT(stcb);
6510         if (stcb->asoc.alternate) {
6511                 net = stcb->asoc.alternate;
6512         } else {
6513                 net = stcb->asoc.primary_destination;
6514         }
6515         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6516                 /* Abort this assoc with m as the user defined reason */
6517                 if (m) {
6518                         struct sctp_paramhdr *ph;
6519
6520                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6521                         if (m) {
6522                                 ph = mtod(m, struct sctp_paramhdr *);
6523                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6524                                 ph->param_length = htons(ca->sndlen);
6525                         }
6526                         /*
6527                          * We add one here to keep the assoc from
6528                          * dis-appearing on us.
6529                          */
6530                         atomic_add_int(&stcb->asoc.refcnt, 1);
6531                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6532                         /*
6533                          * sctp_abort_an_association calls sctp_free_asoc()
6534                          * free association will NOT free it since we
6535                          * incremented the refcnt .. we do this to prevent
6536                          * it being freed and things getting tricky since we
6537                          * could end up (from free_asoc) calling inpcb_free
6538                          * which would get a recursive lock call to the
6539                          * iterator lock.. But as a consequence of that the
6540                          * stcb will return to us un-locked.. since
6541                          * free_asoc returns with either no TCB or the TCB
6542                          * unlocked, we must relock.. to unlock in the
6543                          * iterator timer :-0
6544                          */
6545                         SCTP_TCB_LOCK(stcb);
6546                         atomic_add_int(&stcb->asoc.refcnt, -1);
6547                         goto no_chunk_output;
6548                 }
6549         } else {
6550                 if (m) {
6551                         ret = sctp_msg_append(stcb, net, m,
6552                             &ca->sndrcv, 1);
6553                 }
6554                 asoc = &stcb->asoc;
6555                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6556                         /* shutdown this assoc */
6557                         int cnt;
6558
6559                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6560
6561                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6562                             TAILQ_EMPTY(&asoc->sent_queue) &&
6563                             (cnt == 0)) {
6564                                 if (asoc->locked_on_sending) {
6565                                         goto abort_anyway;
6566                                 }
6567                                 /*
6568                                  * there is nothing queued to send, so I'm
6569                                  * done...
6570                                  */
6571                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6572                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6573                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6574                                         /*
6575                                          * only send SHUTDOWN the first time
6576                                          * through
6577                                          */
6578                                         sctp_send_shutdown(stcb, net);
6579                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6580                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6581                                         }
6582                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6583                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6584                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6585                                             net);
6586                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6587                                             asoc->primary_destination);
6588                                         added_control = 1;
6589                                         do_chunk_output = 0;
6590                                 }
6591                         } else {
6592                                 /*
6593                                  * we still got (or just got) data to send,
6594                                  * so set SHUTDOWN_PENDING
6595                                  */
6596                                 /*
6597                                  * XXX sockets draft says that SCTP_EOF
6598                                  * should be sent with no data.  currently,
6599                                  * we will allow user data to be sent first
6600                                  * and move to SHUTDOWN-PENDING
6601                                  */
6602                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6603                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6604                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6605                                         if (asoc->locked_on_sending) {
6606                                                 /*
6607                                                  * Locked to send out the
6608                                                  * data
6609                                                  */
6610                                                 struct sctp_stream_queue_pending *sp;
6611
6612                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6613                                                 if (sp) {
6614                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6615                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6616                                                 }
6617                                         }
6618                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6619                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6620                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6621                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6622                                 abort_anyway:
6623                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6624                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6625                                                     NULL, SCTP_SO_NOT_LOCKED);
6626                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6627                                                 goto no_chunk_output;
6628                                         }
6629                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6630                                             asoc->primary_destination);
6631                                 }
6632                         }
6633
6634                 }
6635         }
6636         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6637             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6638
6639         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6640             (stcb->asoc.total_flight > 0) &&
6641             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6642             ) {
6643                 do_chunk_output = 0;
6644         }
6645         if (do_chunk_output)
6646                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6647         else if (added_control) {
6648                 int num_out = 0, reason = 0, now_filled = 0;
6649                 struct timeval now;
6650                 int frag_point;
6651
6652                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6653                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6654                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6655         }
6656 no_chunk_output:
6657         if (ret) {
6658                 ca->cnt_failed++;
6659         } else {
6660                 ca->cnt_sent++;
6661         }
6662 }
6663
6664 static void
6665 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6666 {
6667         struct sctp_copy_all *ca;
6668
6669         ca = (struct sctp_copy_all *)ptr;
6670         /*
6671          * Do a notify here? Kacheong suggests that the notify be done at
6672          * the send time.. so you would push up a notification if any send
6673          * failed. Don't know if this is feasable since the only failures we
6674          * have is "memory" related and if you cannot get an mbuf to send
6675          * the data you surely can't get an mbuf to send up to notify the
6676          * user you can't send the data :->
6677          */
6678
6679         /* now free everything */
6680         sctp_m_freem(ca->m);
6681         SCTP_FREE(ca, SCTP_M_COPYAL);
6682 }
6683
6684
6685 #define MC_ALIGN(m, len) do {                                           \
6686         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6687 } while (0)
6688
6689
6690
6691 static struct mbuf *
6692 sctp_copy_out_all(struct uio *uio, int len)
6693 {
6694         struct mbuf *ret, *at;
6695         int left, willcpy, cancpy, error;
6696
6697         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6698         if (ret == NULL) {
6699                 /* TSNH */
6700                 return (NULL);
6701         }
6702         left = len;
6703         SCTP_BUF_LEN(ret) = 0;
6704         /* save space for the data chunk header */
6705         cancpy = M_TRAILINGSPACE(ret);
6706         willcpy = min(cancpy, left);
6707         at = ret;
6708         while (left > 0) {
6709                 /* Align data to the end */
6710                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6711                 if (error) {
6712         err_out_now:
6713                         sctp_m_freem(at);
6714                         return (NULL);
6715                 }
6716                 SCTP_BUF_LEN(at) = willcpy;
6717                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6718                 left -= willcpy;
6719                 if (left > 0) {
6720                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6721                         if (SCTP_BUF_NEXT(at) == NULL) {
6722                                 goto err_out_now;
6723                         }
6724                         at = SCTP_BUF_NEXT(at);
6725                         SCTP_BUF_LEN(at) = 0;
6726                         cancpy = M_TRAILINGSPACE(at);
6727                         willcpy = min(cancpy, left);
6728                 }
6729         }
6730         return (ret);
6731 }
6732
6733 static int
6734 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6735     struct sctp_sndrcvinfo *srcv)
6736 {
6737         int ret;
6738         struct sctp_copy_all *ca;
6739
6740         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6741             SCTP_M_COPYAL);
6742         if (ca == NULL) {
6743                 sctp_m_freem(m);
6744                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6745                 return (ENOMEM);
6746         }
6747         memset(ca, 0, sizeof(struct sctp_copy_all));
6748
6749         ca->inp = inp;
6750         if (srcv) {
6751                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6752         }
6753         /*
6754          * take off the sendall flag, it would be bad if we failed to do
6755          * this :-0
6756          */
6757         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6758         /* get length and mbuf chain */
6759         if (uio) {
6760                 ca->sndlen = uio->uio_resid;
6761                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6762                 if (ca->m == NULL) {
6763                         SCTP_FREE(ca, SCTP_M_COPYAL);
6764                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6765                         return (ENOMEM);
6766                 }
6767         } else {
6768                 /* Gather the length of the send */
6769                 struct mbuf *mat;
6770
6771                 mat = m;
6772                 ca->sndlen = 0;
6773                 while (m) {
6774                         ca->sndlen += SCTP_BUF_LEN(m);
6775                         m = SCTP_BUF_NEXT(m);
6776                 }
6777                 ca->m = mat;
6778         }
6779         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6780             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6781             SCTP_ASOC_ANY_STATE,
6782             (void *)ca, 0,
6783             sctp_sendall_completes, inp, 1);
6784         if (ret) {
6785                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6786                 SCTP_FREE(ca, SCTP_M_COPYAL);
6787                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6788                 return (EFAULT);
6789         }
6790         return (0);
6791 }
6792
6793
6794 void
6795 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6796 {
6797         struct sctp_tmit_chunk *chk, *nchk;
6798
6799         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6800                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6801                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6802                         if (chk->data) {
6803                                 sctp_m_freem(chk->data);
6804                                 chk->data = NULL;
6805                         }
6806                         asoc->ctrl_queue_cnt--;
6807                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6808                 }
6809         }
6810 }
6811
6812 void
6813 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6814 {
6815         struct sctp_association *asoc;
6816         struct sctp_tmit_chunk *chk, *nchk;
6817         struct sctp_asconf_chunk *acp;
6818
6819         asoc = &stcb->asoc;
6820         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6821                 /* find SCTP_ASCONF chunk in queue */
6822                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6823                         if (chk->data) {
6824                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6825                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6826                                         /* Not Acked yet */
6827                                         break;
6828                                 }
6829                         }
6830                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6831                         if (chk->data) {
6832                                 sctp_m_freem(chk->data);
6833                                 chk->data = NULL;
6834                         }
6835                         asoc->ctrl_queue_cnt--;
6836                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6837                 }
6838         }
6839 }
6840
6841
6842 static void
6843 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6844     struct sctp_association *asoc,
6845     struct sctp_tmit_chunk **data_list,
6846     int bundle_at,
6847     struct sctp_nets *net)
6848 {
6849         int i;
6850         struct sctp_tmit_chunk *tp1;
6851
6852         for (i = 0; i < bundle_at; i++) {
6853                 /* off of the send queue */
6854                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6855                 asoc->send_queue_cnt--;
6856                 if (i > 0) {
6857                         /*
6858                          * Any chunk NOT 0 you zap the time chunk 0 gets
6859                          * zapped or set based on if a RTO measurment is
6860                          * needed.
6861                          */
6862                         data_list[i]->do_rtt = 0;
6863                 }
6864                 /* record time */
6865                 data_list[i]->sent_rcv_time = net->last_sent_time;
6866                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6867                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6868                 if (data_list[i]->whoTo == NULL) {
6869                         data_list[i]->whoTo = net;
6870                         atomic_add_int(&net->ref_count, 1);
6871                 }
6872                 /* on to the sent queue */
6873                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6874                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6875                         struct sctp_tmit_chunk *tpp;
6876
6877                         /* need to move back */
6878         back_up_more:
6879                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6880                         if (tpp == NULL) {
6881                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6882                                 goto all_done;
6883                         }
6884                         tp1 = tpp;
6885                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6886                                 goto back_up_more;
6887                         }
6888                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6889                 } else {
6890                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6891                             data_list[i],
6892                             sctp_next);
6893                 }
6894 all_done:
6895                 /* This does not lower until the cum-ack passes it */
6896                 asoc->sent_queue_cnt++;
6897                 if ((asoc->peers_rwnd <= 0) &&
6898                     (asoc->total_flight == 0) &&
6899                     (bundle_at == 1)) {
6900                         /* Mark the chunk as being a window probe */
6901                         SCTP_STAT_INCR(sctps_windowprobed);
6902                 }
6903 #ifdef SCTP_AUDITING_ENABLED
6904                 sctp_audit_log(0xC2, 3);
6905 #endif
6906                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6907                 data_list[i]->snd_count = 1;
6908                 data_list[i]->rec.data.chunk_was_revoked = 0;
6909                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6910                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6911                             data_list[i]->whoTo->flight_size,
6912                             data_list[i]->book_size,
6913                             (uintptr_t) data_list[i]->whoTo,
6914                             data_list[i]->rec.data.TSN_seq);
6915                 }
6916                 sctp_flight_size_increase(data_list[i]);
6917                 sctp_total_flight_increase(stcb, data_list[i]);
6918                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6919                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6920                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6921                 }
6922                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6923                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6924                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6925                         /* SWS sender side engages */
6926                         asoc->peers_rwnd = 0;
6927                 }
6928         }
6929         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6930                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6931         }
6932 }
6933
6934 static void
6935 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6936 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6937     SCTP_UNUSED
6938 #endif
6939 )
6940 {
6941         struct sctp_tmit_chunk *chk, *nchk;
6942
6943         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6944                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6945                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6946                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6947                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6948                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6949                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6950                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6951                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6952                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6953                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6954                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6955                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6956                         /* Stray chunks must be cleaned up */
6957         clean_up_anyway:
6958                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6959                         if (chk->data) {
6960                                 sctp_m_freem(chk->data);
6961                                 chk->data = NULL;
6962                         }
6963                         asoc->ctrl_queue_cnt--;
6964                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6965                                 asoc->fwd_tsn_cnt--;
6966                         sctp_free_a_chunk(stcb, chk, so_locked);
6967                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6968                         /* special handling, we must look into the param */
6969                         if (chk != asoc->str_reset) {
6970                                 goto clean_up_anyway;
6971                         }
6972                 }
6973         }
6974 }
6975
6976
6977 static int
6978 sctp_can_we_split_this(struct sctp_tcb *stcb,
6979     uint32_t length,
6980     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6981 {
6982         /*
6983          * Make a decision on if I should split a msg into multiple parts.
6984          * This is only asked of incomplete messages.
6985          */
6986         if (eeor_on) {
6987                 /*
6988                  * If we are doing EEOR we need to always send it if its the
6989                  * entire thing, since it might be all the guy is putting in
6990                  * the hopper.
6991                  */
6992                 if (goal_mtu >= length) {
6993                         /*-
6994                          * If we have data outstanding,
6995                          * we get another chance when the sack
6996                          * arrives to transmit - wait for more data
6997                          */
6998                         if (stcb->asoc.total_flight == 0) {
6999                                 /*
7000                                  * If nothing is in flight, we zero the
7001                                  * packet counter.
7002                                  */
7003                                 return (length);
7004                         }
7005                         return (0);
7006
7007                 } else {
7008                         /* You can fill the rest */
7009                         return (goal_mtu);
7010                 }
7011         }
7012         /*-
7013          * For those strange folk that make the send buffer
7014          * smaller than our fragmentation point, we can't
7015          * get a full msg in so we have to allow splitting.
7016          */
7017         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7018                 return (length);
7019         }
7020         if ((length <= goal_mtu) ||
7021             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7022                 /* Sub-optimial residual don't split in non-eeor mode. */
7023                 return (0);
7024         }
7025         /*
7026          * If we reach here length is larger than the goal_mtu. Do we wish
7027          * to split it for the sake of packet putting together?
7028          */
7029         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7030                 /* Its ok to split it */
7031                 return (min(goal_mtu, frag_point));
7032         }
7033         /* Nope, can't split */
7034         return (0);
7035
7036 }
7037
7038 static uint32_t
7039 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7040     struct sctp_stream_out *strq,
7041     uint32_t goal_mtu,
7042     uint32_t frag_point,
7043     int *locked,
7044     int *giveup,
7045     int eeor_mode,
7046     int *bail,
7047     int so_locked
7048 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7049     SCTP_UNUSED
7050 #endif
7051 )
7052 {
7053         /* Move from the stream to the send_queue keeping track of the total */
7054         struct sctp_association *asoc;
7055         struct sctp_stream_queue_pending *sp;
7056         struct sctp_tmit_chunk *chk;
7057         struct sctp_data_chunk *dchkh;
7058         uint32_t to_move, length;
7059         uint8_t rcv_flags = 0;
7060         uint8_t some_taken;
7061         uint8_t send_lock_up = 0;
7062
7063         SCTP_TCB_LOCK_ASSERT(stcb);
7064         asoc = &stcb->asoc;
7065 one_more_time:
7066         /* sa_ignore FREED_MEMORY */
7067         sp = TAILQ_FIRST(&strq->outqueue);
7068         if (sp == NULL) {
7069                 *locked = 0;
7070                 if (send_lock_up == 0) {
7071                         SCTP_TCB_SEND_LOCK(stcb);
7072                         send_lock_up = 1;
7073                 }
7074                 sp = TAILQ_FIRST(&strq->outqueue);
7075                 if (sp) {
7076                         goto one_more_time;
7077                 }
7078                 if (strq->last_msg_incomplete) {
7079                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7080                             strq->stream_no,
7081                             strq->last_msg_incomplete);
7082                         strq->last_msg_incomplete = 0;
7083                 }
7084                 to_move = 0;
7085                 if (send_lock_up) {
7086                         SCTP_TCB_SEND_UNLOCK(stcb);
7087                         send_lock_up = 0;
7088                 }
7089                 goto out_of;
7090         }
7091         if ((sp->msg_is_complete) && (sp->length == 0)) {
7092                 if (sp->sender_all_done) {
7093                         /*
7094                          * We are doing differed cleanup. Last time through
7095                          * when we took all the data the sender_all_done was
7096                          * not set.
7097                          */
7098                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7099                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7100                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7101                                     sp->sender_all_done,
7102                                     sp->length,
7103                                     sp->msg_is_complete,
7104                                     sp->put_last_out,
7105                                     send_lock_up);
7106                         }
7107                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7108                                 SCTP_TCB_SEND_LOCK(stcb);
7109                                 send_lock_up = 1;
7110                         }
7111                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7112                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7113                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7114                         if (sp->net) {
7115                                 sctp_free_remote_addr(sp->net);
7116                                 sp->net = NULL;
7117                         }
7118                         if (sp->data) {
7119                                 sctp_m_freem(sp->data);
7120                                 sp->data = NULL;
7121                         }
7122                         sctp_free_a_strmoq(stcb, sp, so_locked);
7123                         /* we can't be locked to it */
7124                         *locked = 0;
7125                         stcb->asoc.locked_on_sending = NULL;
7126                         if (send_lock_up) {
7127                                 SCTP_TCB_SEND_UNLOCK(stcb);
7128                                 send_lock_up = 0;
7129                         }
7130                         /* back to get the next msg */
7131                         goto one_more_time;
7132                 } else {
7133                         /*
7134                          * sender just finished this but still holds a
7135                          * reference
7136                          */
7137                         *locked = 1;
7138                         *giveup = 1;
7139                         to_move = 0;
7140                         goto out_of;
7141                 }
7142         } else {
7143                 /* is there some to get */
7144                 if (sp->length == 0) {
7145                         /* no */
7146                         *locked = 1;
7147                         *giveup = 1;
7148                         to_move = 0;
7149                         goto out_of;
7150                 } else if (sp->discard_rest) {
7151                         if (send_lock_up == 0) {
7152                                 SCTP_TCB_SEND_LOCK(stcb);
7153                                 send_lock_up = 1;
7154                         }
7155                         /* Whack down the size */
7156                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7157                         if ((stcb->sctp_socket != NULL) && \
7158                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7159                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7160                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7161                         }
7162                         if (sp->data) {
7163                                 sctp_m_freem(sp->data);
7164                                 sp->data = NULL;
7165                                 sp->tail_mbuf = NULL;
7166                         }
7167                         sp->length = 0;
7168                         sp->some_taken = 1;
7169                         *locked = 1;
7170                         *giveup = 1;
7171                         to_move = 0;
7172                         goto out_of;
7173                 }
7174         }
7175         some_taken = sp->some_taken;
7176         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7177                 sp->msg_is_complete = 1;
7178         }
7179 re_look:
7180         length = sp->length;
7181         if (sp->msg_is_complete) {
7182                 /* The message is complete */
7183                 to_move = min(length, frag_point);
7184                 if (to_move == length) {
7185                         /* All of it fits in the MTU */
7186                         if (sp->some_taken) {
7187                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7188                                 sp->put_last_out = 1;
7189                         } else {
7190                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7191                                 sp->put_last_out = 1;
7192                         }
7193                 } else {
7194                         /* Not all of it fits, we fragment */
7195                         if (sp->some_taken == 0) {
7196                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7197                         }
7198                         sp->some_taken = 1;
7199                 }
7200         } else {
7201                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7202                 if (to_move) {
7203                         /*-
7204                          * We use a snapshot of length in case it
7205                          * is expanding during the compare.
7206                          */
7207                         uint32_t llen;
7208
7209                         llen = length;
7210                         if (to_move >= llen) {
7211                                 to_move = llen;
7212                                 if (send_lock_up == 0) {
7213                                         /*-
7214                                          * We are taking all of an incomplete msg
7215                                          * thus we need a send lock.
7216                                          */
7217                                         SCTP_TCB_SEND_LOCK(stcb);
7218                                         send_lock_up = 1;
7219                                         if (sp->msg_is_complete) {
7220                                                 /*
7221                                                  * the sender finished the
7222                                                  * msg
7223                                                  */
7224                                                 goto re_look;
7225                                         }
7226                                 }
7227                         }
7228                         if (sp->some_taken == 0) {
7229                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7230                                 sp->some_taken = 1;
7231                         }
7232                 } else {
7233                         /* Nothing to take. */
7234                         if (sp->some_taken) {
7235                                 *locked = 1;
7236                         }
7237                         *giveup = 1;
7238                         to_move = 0;
7239                         goto out_of;
7240                 }
7241         }
7242
7243         /* If we reach here, we can copy out a chunk */
7244         sctp_alloc_a_chunk(stcb, chk);
7245         if (chk == NULL) {
7246                 /* No chunk memory */
7247                 *giveup = 1;
7248                 to_move = 0;
7249                 goto out_of;
7250         }
7251         /*
7252          * Setup for unordered if needed by looking at the user sent info
7253          * flags.
7254          */
7255         if (sp->sinfo_flags & SCTP_UNORDERED) {
7256                 rcv_flags |= SCTP_DATA_UNORDERED;
7257         }
7258         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7259             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7260                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7261         }
7262         /* clear out the chunk before setting up */
7263         memset(chk, 0, sizeof(*chk));
7264         chk->rec.data.rcv_flags = rcv_flags;
7265
7266         if (to_move >= length) {
7267                 /* we think we can steal the whole thing */
7268                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7269                         SCTP_TCB_SEND_LOCK(stcb);
7270                         send_lock_up = 1;
7271                 }
7272                 if (to_move < sp->length) {
7273                         /* bail, it changed */
7274                         goto dont_do_it;
7275                 }
7276                 chk->data = sp->data;
7277                 chk->last_mbuf = sp->tail_mbuf;
7278                 /* register the stealing */
7279                 sp->data = sp->tail_mbuf = NULL;
7280         } else {
7281                 struct mbuf *m;
7282
7283 dont_do_it:
7284                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7285                 chk->last_mbuf = NULL;
7286                 if (chk->data == NULL) {
7287                         sp->some_taken = some_taken;
7288                         sctp_free_a_chunk(stcb, chk, so_locked);
7289                         *bail = 1;
7290                         to_move = 0;
7291                         goto out_of;
7292                 }
7293 #ifdef SCTP_MBUF_LOGGING
7294                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7295                         struct mbuf *mat;
7296
7297                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7298                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7299                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7300                                 }
7301                         }
7302                 }
7303 #endif
7304                 /* Pull off the data */
7305                 m_adj(sp->data, to_move);
7306                 /* Now lets work our way down and compact it */
7307                 m = sp->data;
7308                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7309                         sp->data = SCTP_BUF_NEXT(m);
7310                         SCTP_BUF_NEXT(m) = NULL;
7311                         if (sp->tail_mbuf == m) {
7312                                 /*-
7313                                  * Freeing tail? TSNH since
7314                                  * we supposedly were taking less
7315                                  * than the sp->length.
7316                                  */
7317 #ifdef INVARIANTS
7318                                 panic("Huh, freing tail? - TSNH");
7319 #else
7320                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7321                                 sp->tail_mbuf = sp->data = NULL;
7322                                 sp->length = 0;
7323 #endif
7324
7325                         }
7326                         sctp_m_free(m);
7327                         m = sp->data;
7328                 }
7329         }
7330         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7331                 chk->copy_by_ref = 1;
7332         } else {
7333                 chk->copy_by_ref = 0;
7334         }
7335         /*
7336          * get last_mbuf and counts of mb useage This is ugly but hopefully
7337          * its only one mbuf.
7338          */
7339         if (chk->last_mbuf == NULL) {
7340                 chk->last_mbuf = chk->data;
7341                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7342                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7343                 }
7344         }
7345         if (to_move > length) {
7346                 /*- This should not happen either
7347                  * since we always lower to_move to the size
7348                  * of sp->length if its larger.
7349                  */
7350 #ifdef INVARIANTS
7351                 panic("Huh, how can to_move be larger?");
7352 #else
7353                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7354                 sp->length = 0;
7355 #endif
7356         } else {
7357                 atomic_subtract_int(&sp->length, to_move);
7358         }
7359         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7360                 /* Not enough room for a chunk header, get some */
7361                 struct mbuf *m;
7362
7363                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7364                 if (m == NULL) {
7365                         /*
7366                          * we're in trouble here. _PREPEND below will free
7367                          * all the data if there is no leading space, so we
7368                          * must put the data back and restore.
7369                          */
7370                         if (send_lock_up == 0) {
7371                                 SCTP_TCB_SEND_LOCK(stcb);
7372                                 send_lock_up = 1;
7373                         }
7374                         if (chk->data == NULL) {
7375                                 /* unsteal the data */
7376                                 sp->data = chk->data;
7377                                 sp->tail_mbuf = chk->last_mbuf;
7378                         } else {
7379                                 struct mbuf *m_tmp;
7380
7381                                 /* reassemble the data */
7382                                 m_tmp = sp->data;
7383                                 sp->data = chk->data;
7384                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7385                         }
7386                         sp->some_taken = some_taken;
7387                         atomic_add_int(&sp->length, to_move);
7388                         chk->data = NULL;
7389                         *bail = 1;
7390                         sctp_free_a_chunk(stcb, chk, so_locked);
7391                         to_move = 0;
7392                         goto out_of;
7393                 } else {
7394                         SCTP_BUF_LEN(m) = 0;
7395                         SCTP_BUF_NEXT(m) = chk->data;
7396                         chk->data = m;
7397                         M_ALIGN(chk->data, 4);
7398                 }
7399         }
7400         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7401         if (chk->data == NULL) {
7402                 /* HELP, TSNH since we assured it would not above? */
7403 #ifdef INVARIANTS
7404                 panic("prepend failes HELP?");
7405 #else
7406                 SCTP_PRINTF("prepend fails HELP?\n");
7407                 sctp_free_a_chunk(stcb, chk, so_locked);
7408 #endif
7409                 *bail = 1;
7410                 to_move = 0;
7411                 goto out_of;
7412         }
7413         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7414         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7415         chk->book_size_scale = 0;
7416         chk->sent = SCTP_DATAGRAM_UNSENT;
7417
7418         chk->flags = 0;
7419         chk->asoc = &stcb->asoc;
7420         chk->pad_inplace = 0;
7421         chk->no_fr_allowed = 0;
7422         chk->rec.data.stream_seq = strq->next_sequence_send;
7423         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
7424                 strq->next_sequence_send++;
7425         }
7426         chk->rec.data.stream_number = sp->stream;
7427         chk->rec.data.payloadtype = sp->ppid;
7428         chk->rec.data.context = sp->context;
7429         chk->rec.data.doing_fast_retransmit = 0;
7430
7431         chk->rec.data.timetodrop = sp->ts;
7432         chk->flags = sp->act_flags;
7433
7434         if (sp->net) {
7435                 chk->whoTo = sp->net;
7436                 atomic_add_int(&chk->whoTo->ref_count, 1);
7437         } else
7438                 chk->whoTo = NULL;
7439
7440         if (sp->holds_key_ref) {
7441                 chk->auth_keyid = sp->auth_keyid;
7442                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7443                 chk->holds_key_ref = 1;
7444         }
7445         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7446         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7447                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7448                     (uintptr_t) stcb, sp->length,
7449                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7450                     chk->rec.data.TSN_seq);
7451         }
7452         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7453         /*
7454          * Put the rest of the things in place now. Size was done earlier in
7455          * previous loop prior to padding.
7456          */
7457
7458 #ifdef SCTP_ASOCLOG_OF_TSNS
7459         SCTP_TCB_LOCK_ASSERT(stcb);
7460         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7461                 asoc->tsn_out_at = 0;
7462                 asoc->tsn_out_wrapped = 1;
7463         }
7464         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7465         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7466         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7467         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7468         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7469         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7470         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7471         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7472         asoc->tsn_out_at++;
7473 #endif
7474
7475         dchkh->ch.chunk_type = SCTP_DATA;
7476         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7477         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7478         dchkh->dp.stream_id = htons(strq->stream_no);
7479         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7480         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7481         dchkh->ch.chunk_length = htons(chk->send_size);
7482         /* Now advance the chk->send_size by the actual pad needed. */
7483         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7484                 /* need a pad */
7485                 struct mbuf *lm;
7486                 int pads;
7487
7488                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7489                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7490                         chk->pad_inplace = 1;
7491                 }
7492                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7493                         /* pad added an mbuf */
7494                         chk->last_mbuf = lm;
7495                 }
7496                 chk->send_size += pads;
7497         }
7498         /* We only re-set the policy if it is on */
7499         if (sp->pr_sctp_on) {
7500                 sctp_set_prsctp_policy(sp);
7501                 asoc->pr_sctp_cnt++;
7502                 chk->pr_sctp_on = 1;
7503         } else {
7504                 chk->pr_sctp_on = 0;
7505         }
7506         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7507                 /* All done pull and kill the message */
7508                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7509                 if (sp->put_last_out == 0) {
7510                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7511                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7512                             sp->sender_all_done,
7513                             sp->length,
7514                             sp->msg_is_complete,
7515                             sp->put_last_out,
7516                             send_lock_up);
7517                 }
7518                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7519                         SCTP_TCB_SEND_LOCK(stcb);
7520                         send_lock_up = 1;
7521                 }
7522                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7523                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7524                 if (sp->net) {
7525                         sctp_free_remote_addr(sp->net);
7526                         sp->net = NULL;
7527                 }
7528                 if (sp->data) {
7529                         sctp_m_freem(sp->data);
7530                         sp->data = NULL;
7531                 }
7532                 sctp_free_a_strmoq(stcb, sp, so_locked);
7533
7534                 /* we can't be locked to it */
7535                 *locked = 0;
7536                 stcb->asoc.locked_on_sending = NULL;
7537         } else {
7538                 /* more to go, we are locked */
7539                 *locked = 1;
7540         }
7541         asoc->chunks_on_out_queue++;
7542         strq->chunks_on_queues++;
7543         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7544         asoc->send_queue_cnt++;
7545 out_of:
7546         if (send_lock_up) {
7547                 SCTP_TCB_SEND_UNLOCK(stcb);
7548         }
7549         return (to_move);
7550 }
7551
7552
7553 static void
7554 sctp_fill_outqueue(struct sctp_tcb *stcb,
7555     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7556 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7557     SCTP_UNUSED
7558 #endif
7559 )
7560 {
7561         struct sctp_association *asoc;
7562         struct sctp_stream_out *strq;
7563         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7564         int locked, giveup;
7565
7566         SCTP_TCB_LOCK_ASSERT(stcb);
7567         asoc = &stcb->asoc;
7568         switch (net->ro._l_addr.sa.sa_family) {
7569 #ifdef INET
7570         case AF_INET:
7571                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7572                 break;
7573 #endif
7574 #ifdef INET6
7575         case AF_INET6:
7576                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7577                 break;
7578 #endif
7579         default:
7580                 /* TSNH */
7581                 goal_mtu = net->mtu;
7582                 break;
7583         }
7584         /* Need an allowance for the data chunk header too */
7585         goal_mtu -= sizeof(struct sctp_data_chunk);
7586
7587         /* must make even word boundary */
7588         goal_mtu &= 0xfffffffc;
7589         if (asoc->locked_on_sending) {
7590                 /* We are stuck on one stream until the message completes. */
7591                 strq = asoc->locked_on_sending;
7592                 locked = 1;
7593         } else {
7594                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7595                 locked = 0;
7596         }
7597         while ((goal_mtu > 0) && strq) {
7598                 giveup = 0;
7599                 bail = 0;
7600                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7601                     &giveup, eeor_mode, &bail, so_locked);
7602                 if (moved_how_much)
7603                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7604
7605                 if (locked) {
7606                         asoc->locked_on_sending = strq;
7607                         if ((moved_how_much == 0) || (giveup) || bail)
7608                                 /* no more to move for now */
7609                                 break;
7610                 } else {
7611                         asoc->locked_on_sending = NULL;
7612                         if ((giveup) || bail) {
7613                                 break;
7614                         }
7615                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7616                         if (strq == NULL) {
7617                                 break;
7618                         }
7619                 }
7620                 total_moved += moved_how_much;
7621                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7622                 goal_mtu &= 0xfffffffc;
7623         }
7624         if (bail)
7625                 *quit_now = 1;
7626
7627         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7628
7629         if (total_moved == 0) {
7630                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7631                     (net == stcb->asoc.primary_destination)) {
7632                         /* ran dry for primary network net */
7633                         SCTP_STAT_INCR(sctps_primary_randry);
7634                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7635                         /* ran dry with CMT on */
7636                         SCTP_STAT_INCR(sctps_cmt_randry);
7637                 }
7638         }
7639 }
7640
7641 void
7642 sctp_fix_ecn_echo(struct sctp_association *asoc)
7643 {
7644         struct sctp_tmit_chunk *chk;
7645
7646         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7647                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7648                         chk->sent = SCTP_DATAGRAM_UNSENT;
7649                 }
7650         }
7651 }
7652
7653 void
7654 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7655 {
7656         struct sctp_association *asoc;
7657         struct sctp_tmit_chunk *chk;
7658         struct sctp_stream_queue_pending *sp;
7659         unsigned int i;
7660
7661         if (net == NULL) {
7662                 return;
7663         }
7664         asoc = &stcb->asoc;
7665         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7666                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7667                         if (sp->net == net) {
7668                                 sctp_free_remote_addr(sp->net);
7669                                 sp->net = NULL;
7670                         }
7671                 }
7672         }
7673         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7674                 if (chk->whoTo == net) {
7675                         sctp_free_remote_addr(chk->whoTo);
7676                         chk->whoTo = NULL;
7677                 }
7678         }
7679 }
7680
7681 int
7682 sctp_med_chunk_output(struct sctp_inpcb *inp,
7683     struct sctp_tcb *stcb,
7684     struct sctp_association *asoc,
7685     int *num_out,
7686     int *reason_code,
7687     int control_only, int from_where,
7688     struct timeval *now, int *now_filled, int frag_point, int so_locked
7689 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7690     SCTP_UNUSED
7691 #endif
7692 )
7693 {
7694         /*
7695          * Ok this is the generic chunk service queue. we must do the
7696          * following: - Service the stream queue that is next, moving any
7697          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7698          * LAST to the out queue in one pass) and assigning TSN's - Check to
7699          * see if the cwnd/rwnd allows any output, if so we go ahead and
7700          * fomulate and send the low level chunks. Making sure to combine
7701          * any control in the control chunk queue also.
7702          */
7703         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7704         struct mbuf *outchain, *endoutchain;
7705         struct sctp_tmit_chunk *chk, *nchk;
7706
7707         /* temp arrays for unlinking */
7708         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7709         int no_fragmentflg, error;
7710         unsigned int max_rwnd_per_dest, max_send_per_dest;
7711         int one_chunk, hbflag, skip_data_for_this_net;
7712         int asconf, cookie, no_out_cnt;
7713         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7714         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7715         int tsns_sent = 0;
7716         uint32_t auth_offset = 0;
7717         struct sctp_auth_chunk *auth = NULL;
7718         uint16_t auth_keyid;
7719         int override_ok = 1;
7720         int skip_fill_up = 0;
7721         int data_auth_reqd = 0;
7722
7723         /*
7724          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7725          * destination.
7726          */
7727         int quit_now = 0;
7728
7729         *num_out = 0;
7730         auth_keyid = stcb->asoc.authinfo.active_keyid;
7731
7732         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7733             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7734             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7735                 eeor_mode = 1;
7736         } else {
7737                 eeor_mode = 0;
7738         }
7739         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7740         /*
7741          * First lets prime the pump. For each destination, if there is room
7742          * in the flight size, attempt to pull an MTU's worth out of the
7743          * stream queues into the general send_queue
7744          */
7745 #ifdef SCTP_AUDITING_ENABLED
7746         sctp_audit_log(0xC2, 2);
7747 #endif
7748         SCTP_TCB_LOCK_ASSERT(stcb);
7749         hbflag = 0;
7750         if ((control_only) || (asoc->stream_reset_outstanding))
7751                 no_data_chunks = 1;
7752         else
7753                 no_data_chunks = 0;
7754
7755         /* Nothing to possible to send? */
7756         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7757             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7758             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7759             TAILQ_EMPTY(&asoc->send_queue) &&
7760             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7761 nothing_to_send:
7762                 *reason_code = 9;
7763                 return (0);
7764         }
7765         if (asoc->peers_rwnd == 0) {
7766                 /* No room in peers rwnd */
7767                 *reason_code = 1;
7768                 if (asoc->total_flight > 0) {
7769                         /* we are allowed one chunk in flight */
7770                         no_data_chunks = 1;
7771                 }
7772         }
7773         if (stcb->asoc.ecn_echo_cnt_onq) {
7774                 /* Record where a sack goes, if any */
7775                 if (no_data_chunks &&
7776                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7777                         /* Nothing but ECNe to send - we don't do that */
7778                         goto nothing_to_send;
7779                 }
7780                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7781                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7782                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7783                                 sack_goes_to = chk->whoTo;
7784                                 break;
7785                         }
7786                 }
7787         }
7788         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7789         if (stcb->sctp_socket)
7790                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7791         else
7792                 max_send_per_dest = 0;
7793         if (no_data_chunks == 0) {
7794                 /* How many non-directed chunks are there? */
7795                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7796                         if (chk->whoTo == NULL) {
7797                                 /*
7798                                  * We already have non-directed chunks on
7799                                  * the queue, no need to do a fill-up.
7800                                  */
7801                                 skip_fill_up = 1;
7802                                 break;
7803                         }
7804                 }
7805
7806         }
7807         if ((no_data_chunks == 0) &&
7808             (skip_fill_up == 0) &&
7809             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7810                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7811                         /*
7812                          * This for loop we are in takes in each net, if
7813                          * its's got space in cwnd and has data sent to it
7814                          * (when CMT is off) then it calls
7815                          * sctp_fill_outqueue for the net. This gets data on
7816                          * the send queue for that network.
7817                          *
7818                          * In sctp_fill_outqueue TSN's are assigned and data is
7819                          * copied out of the stream buffers. Note mostly
7820                          * copy by reference (we hope).
7821                          */
7822                         net->window_probe = 0;
7823                         if ((net != stcb->asoc.alternate) &&
7824                             ((net->dest_state & SCTP_ADDR_PF) ||
7825                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7826                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7827                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7828                                         sctp_log_cwnd(stcb, net, 1,
7829                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7830                                 }
7831                                 continue;
7832                         }
7833                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7834                             (net->flight_size == 0)) {
7835                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7836                         }
7837                         if (net->flight_size >= net->cwnd) {
7838                                 /* skip this network, no room - can't fill */
7839                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7840                                         sctp_log_cwnd(stcb, net, 3,
7841                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7842                                 }
7843                                 continue;
7844                         }
7845                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7846                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7847                         }
7848                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7849                         if (quit_now) {
7850                                 /* memory alloc failure */
7851                                 no_data_chunks = 1;
7852                                 break;
7853                         }
7854                 }
7855         }
7856         /* now service each destination and send out what we can for it */
7857         /* Nothing to send? */
7858         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7859             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7860             TAILQ_EMPTY(&asoc->send_queue)) {
7861                 *reason_code = 8;
7862                 return (0);
7863         }
7864         if (asoc->sctp_cmt_on_off > 0) {
7865                 /* get the last start point */
7866                 start_at = asoc->last_net_cmt_send_started;
7867                 if (start_at == NULL) {
7868                         /* null so to beginning */
7869                         start_at = TAILQ_FIRST(&asoc->nets);
7870                 } else {
7871                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7872                         if (start_at == NULL) {
7873                                 start_at = TAILQ_FIRST(&asoc->nets);
7874                         }
7875                 }
7876                 asoc->last_net_cmt_send_started = start_at;
7877         } else {
7878                 start_at = TAILQ_FIRST(&asoc->nets);
7879         }
7880         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7881                 if (chk->whoTo == NULL) {
7882                         if (asoc->alternate) {
7883                                 chk->whoTo = asoc->alternate;
7884                         } else {
7885                                 chk->whoTo = asoc->primary_destination;
7886                         }
7887                         atomic_add_int(&chk->whoTo->ref_count, 1);
7888                 }
7889         }
7890         old_start_at = NULL;
7891 again_one_more_time:
7892         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7893                 /* how much can we send? */
7894                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7895                 if (old_start_at && (old_start_at == net)) {
7896                         /* through list ocmpletely. */
7897                         break;
7898                 }
7899                 tsns_sent = 0xa;
7900                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7901                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7902                     (net->flight_size >= net->cwnd)) {
7903                         /*
7904                          * Nothing on control or asconf and flight is full,
7905                          * we can skip even in the CMT case.
7906                          */
7907                         continue;
7908                 }
7909                 bundle_at = 0;
7910                 endoutchain = outchain = NULL;
7911                 no_fragmentflg = 1;
7912                 one_chunk = 0;
7913                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7914                         skip_data_for_this_net = 1;
7915                 } else {
7916                         skip_data_for_this_net = 0;
7917                 }
7918                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7919                         /*
7920                          * if we have a route and an ifp check to see if we
7921                          * have room to send to this guy
7922                          */
7923                         struct ifnet *ifp;
7924
7925                         ifp = net->ro.ro_rt->rt_ifp;
7926                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7927                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7928                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7929                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7930                                 }
7931                                 continue;
7932                         }
7933                 }
7934                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7935 #ifdef INET
7936                 case AF_INET:
7937                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7938                         break;
7939 #endif
7940 #ifdef INET6
7941                 case AF_INET6:
7942                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7943                         break;
7944 #endif
7945                 default:
7946                         /* TSNH */
7947                         mtu = net->mtu;
7948                         break;
7949                 }
7950                 mx_mtu = mtu;
7951                 to_out = 0;
7952                 if (mtu > asoc->peers_rwnd) {
7953                         if (asoc->total_flight > 0) {
7954                                 /* We have a packet in flight somewhere */
7955                                 r_mtu = asoc->peers_rwnd;
7956                         } else {
7957                                 /* We are always allowed to send one MTU out */
7958                                 one_chunk = 1;
7959                                 r_mtu = mtu;
7960                         }
7961                 } else {
7962                         r_mtu = mtu;
7963                 }
7964                 /************************/
7965                 /* ASCONF transmission */
7966                 /************************/
7967                 /* Now first lets go through the asconf queue */
7968                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7969                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7970                                 continue;
7971                         }
7972                         if (chk->whoTo == NULL) {
7973                                 if (asoc->alternate == NULL) {
7974                                         if (asoc->primary_destination != net) {
7975                                                 break;
7976                                         }
7977                                 } else {
7978                                         if (asoc->alternate != net) {
7979                                                 break;
7980                                         }
7981                                 }
7982                         } else {
7983                                 if (chk->whoTo != net) {
7984                                         break;
7985                                 }
7986                         }
7987                         if (chk->data == NULL) {
7988                                 break;
7989                         }
7990                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7991                             chk->sent != SCTP_DATAGRAM_RESEND) {
7992                                 break;
7993                         }
7994                         /*
7995                          * if no AUTH is yet included and this chunk
7996                          * requires it, make sure to account for it.  We
7997                          * don't apply the size until the AUTH chunk is
7998                          * actually added below in case there is no room for
7999                          * this chunk. NOTE: we overload the use of "omtu"
8000                          * here
8001                          */
8002                         if ((auth == NULL) &&
8003                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8004                             stcb->asoc.peer_auth_chunks)) {
8005                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8006                         } else
8007                                 omtu = 0;
8008                         /* Here we do NOT factor the r_mtu */
8009                         if ((chk->send_size < (int)(mtu - omtu)) ||
8010                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8011                                 /*
8012                                  * We probably should glom the mbuf chain
8013                                  * from the chk->data for control but the
8014                                  * problem is it becomes yet one more level
8015                                  * of tracking to do if for some reason
8016                                  * output fails. Then I have got to
8017                                  * reconstruct the merged control chain.. el
8018                                  * yucko.. for now we take the easy way and
8019                                  * do the copy
8020                                  */
8021                                 /*
8022                                  * Add an AUTH chunk, if chunk requires it
8023                                  * save the offset into the chain for AUTH
8024                                  */
8025                                 if ((auth == NULL) &&
8026                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8027                                     stcb->asoc.peer_auth_chunks))) {
8028                                         outchain = sctp_add_auth_chunk(outchain,
8029                                             &endoutchain,
8030                                             &auth,
8031                                             &auth_offset,
8032                                             stcb,
8033                                             chk->rec.chunk_id.id);
8034                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8035                                 }
8036                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8037                                     (int)chk->rec.chunk_id.can_take_data,
8038                                     chk->send_size, chk->copy_by_ref);
8039                                 if (outchain == NULL) {
8040                                         *reason_code = 8;
8041                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8042                                         return (ENOMEM);
8043                                 }
8044                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8045                                 /* update our MTU size */
8046                                 if (mtu > (chk->send_size + omtu))
8047                                         mtu -= (chk->send_size + omtu);
8048                                 else
8049                                         mtu = 0;
8050                                 to_out += (chk->send_size + omtu);
8051                                 /* Do clear IP_DF ? */
8052                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8053                                         no_fragmentflg = 0;
8054                                 }
8055                                 if (chk->rec.chunk_id.can_take_data)
8056                                         chk->data = NULL;
8057                                 /*
8058                                  * set hb flag since we can use these for
8059                                  * RTO
8060                                  */
8061                                 hbflag = 1;
8062                                 asconf = 1;
8063                                 /*
8064                                  * should sysctl this: don't bundle data
8065                                  * with ASCONF since it requires AUTH
8066                                  */
8067                                 no_data_chunks = 1;
8068                                 chk->sent = SCTP_DATAGRAM_SENT;
8069                                 if (chk->whoTo == NULL) {
8070                                         chk->whoTo = net;
8071                                         atomic_add_int(&net->ref_count, 1);
8072                                 }
8073                                 chk->snd_count++;
8074                                 if (mtu == 0) {
8075                                         /*
8076                                          * Ok we are out of room but we can
8077                                          * output without effecting the
8078                                          * flight size since this little guy
8079                                          * is a control only packet.
8080                                          */
8081                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8082                                         /*
8083                                          * do NOT clear the asconf flag as
8084                                          * it is used to do appropriate
8085                                          * source address selection.
8086                                          */
8087                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8088                                             (struct sockaddr *)&net->ro._l_addr,
8089                                             outchain, auth_offset, auth,
8090                                             stcb->asoc.authinfo.active_keyid,
8091                                             no_fragmentflg, 0, asconf,
8092                                             inp->sctp_lport, stcb->rport,
8093                                             htonl(stcb->asoc.peer_vtag),
8094                                             net->port, NULL,
8095                                             0, 0,
8096                                             so_locked))) {
8097                                                 if (error == ENOBUFS) {
8098                                                         asoc->ifp_had_enobuf = 1;
8099                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8100                                                 }
8101                                                 if (from_where == 0) {
8102                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8103                                                 }
8104                                                 if (*now_filled == 0) {
8105                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8106                                                         *now_filled = 1;
8107                                                         *now = net->last_sent_time;
8108                                                 } else {
8109                                                         net->last_sent_time = *now;
8110                                                 }
8111                                                 hbflag = 0;
8112                                                 /* error, could not output */
8113                                                 if (error == EHOSTUNREACH) {
8114                                                         /*
8115                                                          * Destination went
8116                                                          * unreachable
8117                                                          * during this send
8118                                                          */
8119                                                         sctp_move_chunks_from_net(stcb, net);
8120                                                 }
8121                                                 *reason_code = 7;
8122                                                 continue;
8123                                         } else
8124                                                 asoc->ifp_had_enobuf = 0;
8125                                         if (*now_filled == 0) {
8126                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8127                                                 *now_filled = 1;
8128                                                 *now = net->last_sent_time;
8129                                         } else {
8130                                                 net->last_sent_time = *now;
8131                                         }
8132                                         hbflag = 0;
8133                                         /*
8134                                          * increase the number we sent, if a
8135                                          * cookie is sent we don't tell them
8136                                          * any was sent out.
8137                                          */
8138                                         outchain = endoutchain = NULL;
8139                                         auth = NULL;
8140                                         auth_offset = 0;
8141                                         if (!no_out_cnt)
8142                                                 *num_out += ctl_cnt;
8143                                         /* recalc a clean slate and setup */
8144                                         switch (net->ro._l_addr.sa.sa_family) {
8145 #ifdef INET
8146                                         case AF_INET:
8147                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8148                                                 break;
8149 #endif
8150 #ifdef INET6
8151                                         case AF_INET6:
8152                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8153                                                 break;
8154 #endif
8155                                         default:
8156                                                 /* TSNH */
8157                                                 mtu = net->mtu;
8158                                                 break;
8159                                         }
8160                                         to_out = 0;
8161                                         no_fragmentflg = 1;
8162                                 }
8163                         }
8164                 }
8165                 /************************/
8166                 /* Control transmission */
8167                 /************************/
8168                 /* Now first lets go through the control queue */
8169                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8170                         if ((sack_goes_to) &&
8171                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8172                             (chk->whoTo != sack_goes_to)) {
8173                                 /*
8174                                  * if we have a sack in queue, and we are
8175                                  * looking at an ecn echo that is NOT queued
8176                                  * to where the sack is going..
8177                                  */
8178                                 if (chk->whoTo == net) {
8179                                         /*
8180                                          * Don't transmit it to where its
8181                                          * going (current net)
8182                                          */
8183                                         continue;
8184                                 } else if (sack_goes_to == net) {
8185                                         /*
8186                                          * But do transmit it to this
8187                                          * address
8188                                          */
8189                                         goto skip_net_check;
8190                                 }
8191                         }
8192                         if (chk->whoTo == NULL) {
8193                                 if (asoc->alternate == NULL) {
8194                                         if (asoc->primary_destination != net) {
8195                                                 continue;
8196                                         }
8197                                 } else {
8198                                         if (asoc->alternate != net) {
8199                                                 continue;
8200                                         }
8201                                 }
8202                         } else {
8203                                 if (chk->whoTo != net) {
8204                                         continue;
8205                                 }
8206                         }
8207         skip_net_check:
8208                         if (chk->data == NULL) {
8209                                 continue;
8210                         }
8211                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8212                                 /*
8213                                  * It must be unsent. Cookies and ASCONF's
8214                                  * hang around but there timers will force
8215                                  * when marked for resend.
8216                                  */
8217                                 continue;
8218                         }
8219                         /*
8220                          * if no AUTH is yet included and this chunk
8221                          * requires it, make sure to account for it.  We
8222                          * don't apply the size until the AUTH chunk is
8223                          * actually added below in case there is no room for
8224                          * this chunk. NOTE: we overload the use of "omtu"
8225                          * here
8226                          */
8227                         if ((auth == NULL) &&
8228                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8229                             stcb->asoc.peer_auth_chunks)) {
8230                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8231                         } else
8232                                 omtu = 0;
8233                         /* Here we do NOT factor the r_mtu */
8234                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8235                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8236                                 /*
8237                                  * We probably should glom the mbuf chain
8238                                  * from the chk->data for control but the
8239                                  * problem is it becomes yet one more level
8240                                  * of tracking to do if for some reason
8241                                  * output fails. Then I have got to
8242                                  * reconstruct the merged control chain.. el
8243                                  * yucko.. for now we take the easy way and
8244                                  * do the copy
8245                                  */
8246                                 /*
8247                                  * Add an AUTH chunk, if chunk requires it
8248                                  * save the offset into the chain for AUTH
8249                                  */
8250                                 if ((auth == NULL) &&
8251                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8252                                     stcb->asoc.peer_auth_chunks))) {
8253                                         outchain = sctp_add_auth_chunk(outchain,
8254                                             &endoutchain,
8255                                             &auth,
8256                                             &auth_offset,
8257                                             stcb,
8258                                             chk->rec.chunk_id.id);
8259                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8260                                 }
8261                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8262                                     (int)chk->rec.chunk_id.can_take_data,
8263                                     chk->send_size, chk->copy_by_ref);
8264                                 if (outchain == NULL) {
8265                                         *reason_code = 8;
8266                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8267                                         return (ENOMEM);
8268                                 }
8269                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8270                                 /* update our MTU size */
8271                                 if (mtu > (chk->send_size + omtu))
8272                                         mtu -= (chk->send_size + omtu);
8273                                 else
8274                                         mtu = 0;
8275                                 to_out += (chk->send_size + omtu);
8276                                 /* Do clear IP_DF ? */
8277                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8278                                         no_fragmentflg = 0;
8279                                 }
8280                                 if (chk->rec.chunk_id.can_take_data)
8281                                         chk->data = NULL;
8282                                 /* Mark things to be removed, if needed */
8283                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8284                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8285                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8286                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8287                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8288                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8289                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8290                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8291                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8292                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8293                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8294                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8295                                                 hbflag = 1;
8296                                         }
8297                                         /* remove these chunks at the end */
8298                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8299                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8300                                                 /* turn off the timer */
8301                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8302                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8303                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8304                                                 }
8305                                         }
8306                                         ctl_cnt++;
8307                                 } else {
8308                                         /*
8309                                          * Other chunks, since they have
8310                                          * timers running (i.e. COOKIE) we
8311                                          * just "trust" that it gets sent or
8312                                          * retransmitted.
8313                                          */
8314                                         ctl_cnt++;
8315                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8316                                                 cookie = 1;
8317                                                 no_out_cnt = 1;
8318                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8319                                                 /*
8320                                                  * Increment ecne send count
8321                                                  * here this means we may be
8322                                                  * over-zealous in our
8323                                                  * counting if the send
8324                                                  * fails, but its the best
8325                                                  * place to do it (we used
8326                                                  * to do it in the queue of
8327                                                  * the chunk, but that did
8328                                                  * not tell how many times
8329                                                  * it was sent.
8330                                                  */
8331                                                 SCTP_STAT_INCR(sctps_sendecne);
8332                                         }
8333                                         chk->sent = SCTP_DATAGRAM_SENT;
8334                                         if (chk->whoTo == NULL) {
8335                                                 chk->whoTo = net;
8336                                                 atomic_add_int(&net->ref_count, 1);
8337                                         }
8338                                         chk->snd_count++;
8339                                 }
8340                                 if (mtu == 0) {
8341                                         /*
8342                                          * Ok we are out of room but we can
8343                                          * output without effecting the
8344                                          * flight size since this little guy
8345                                          * is a control only packet.
8346                                          */
8347                                         if (asconf) {
8348                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8349                                                 /*
8350                                                  * do NOT clear the asconf
8351                                                  * flag as it is used to do
8352                                                  * appropriate source
8353                                                  * address selection.
8354                                                  */
8355                                         }
8356                                         if (cookie) {
8357                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8358                                                 cookie = 0;
8359                                         }
8360                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8361                                             (struct sockaddr *)&net->ro._l_addr,
8362                                             outchain,
8363                                             auth_offset, auth,
8364                                             stcb->asoc.authinfo.active_keyid,
8365                                             no_fragmentflg, 0, asconf,
8366                                             inp->sctp_lport, stcb->rport,
8367                                             htonl(stcb->asoc.peer_vtag),
8368                                             net->port, NULL,
8369                                             0, 0,
8370                                             so_locked))) {
8371                                                 if (error == ENOBUFS) {
8372                                                         asoc->ifp_had_enobuf = 1;
8373                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8374                                                 }
8375                                                 if (from_where == 0) {
8376                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8377                                                 }
8378                                                 /* error, could not output */
8379                                                 if (hbflag) {
8380                                                         if (*now_filled == 0) {
8381                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8382                                                                 *now_filled = 1;
8383                                                                 *now = net->last_sent_time;
8384                                                         } else {
8385                                                                 net->last_sent_time = *now;
8386                                                         }
8387                                                         hbflag = 0;
8388                                                 }
8389                                                 if (error == EHOSTUNREACH) {
8390                                                         /*
8391                                                          * Destination went
8392                                                          * unreachable
8393                                                          * during this send
8394                                                          */
8395                                                         sctp_move_chunks_from_net(stcb, net);
8396                                                 }
8397                                                 *reason_code = 7;
8398                                                 continue;
8399                                         } else
8400                                                 asoc->ifp_had_enobuf = 0;
8401                                         /* Only HB or ASCONF advances time */
8402                                         if (hbflag) {
8403                                                 if (*now_filled == 0) {
8404                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8405                                                         *now_filled = 1;
8406                                                         *now = net->last_sent_time;
8407                                                 } else {
8408                                                         net->last_sent_time = *now;
8409                                                 }
8410                                                 hbflag = 0;
8411                                         }
8412                                         /*
8413                                          * increase the number we sent, if a
8414                                          * cookie is sent we don't tell them
8415                                          * any was sent out.
8416                                          */
8417                                         outchain = endoutchain = NULL;
8418                                         auth = NULL;
8419                                         auth_offset = 0;
8420                                         if (!no_out_cnt)
8421                                                 *num_out += ctl_cnt;
8422                                         /* recalc a clean slate and setup */
8423                                         switch (net->ro._l_addr.sa.sa_family) {
8424 #ifdef INET
8425                                         case AF_INET:
8426                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8427                                                 break;
8428 #endif
8429 #ifdef INET6
8430                                         case AF_INET6:
8431                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8432                                                 break;
8433 #endif
8434                                         default:
8435                                                 /* TSNH */
8436                                                 mtu = net->mtu;
8437                                                 break;
8438                                         }
8439                                         to_out = 0;
8440                                         no_fragmentflg = 1;
8441                                 }
8442                         }
8443                 }
8444                 /* JRI: if dest is in PF state, do not send data to it */
8445                 if ((asoc->sctp_cmt_on_off > 0) &&
8446                     (net != stcb->asoc.alternate) &&
8447                     (net->dest_state & SCTP_ADDR_PF)) {
8448                         goto no_data_fill;
8449                 }
8450                 if (net->flight_size >= net->cwnd) {
8451                         goto no_data_fill;
8452                 }
8453                 if ((asoc->sctp_cmt_on_off > 0) &&
8454                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8455                     (net->flight_size > max_rwnd_per_dest)) {
8456                         goto no_data_fill;
8457                 }
8458                 /*
8459                  * We need a specific accounting for the usage of the send
8460                  * buffer. We also need to check the number of messages per
8461                  * net. For now, this is better than nothing and it disabled
8462                  * by default...
8463                  */
8464                 if ((asoc->sctp_cmt_on_off > 0) &&
8465                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8466                     (max_send_per_dest > 0) &&
8467                     (net->flight_size > max_send_per_dest)) {
8468                         goto no_data_fill;
8469                 }
8470                 /*********************/
8471                 /* Data transmission */
8472                 /*********************/
8473                 /*
8474                  * if AUTH for DATA is required and no AUTH has been added
8475                  * yet, account for this in the mtu now... if no data can be
8476                  * bundled, this adjustment won't matter anyways since the
8477                  * packet will be going out...
8478                  */
8479                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8480                     stcb->asoc.peer_auth_chunks);
8481                 if (data_auth_reqd && (auth == NULL)) {
8482                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8483                 }
8484                 /* now lets add any data within the MTU constraints */
8485                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8486 #ifdef INET
8487                 case AF_INET:
8488                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8489                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8490                         else
8491                                 omtu = 0;
8492                         break;
8493 #endif
8494 #ifdef INET6
8495                 case AF_INET6:
8496                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8497                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8498                         else
8499                                 omtu = 0;
8500                         break;
8501 #endif
8502                 default:
8503                         /* TSNH */
8504                         omtu = 0;
8505                         break;
8506                 }
8507                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8508                     (skip_data_for_this_net == 0)) ||
8509                     (cookie)) {
8510                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8511                                 if (no_data_chunks) {
8512                                         /* let only control go out */
8513                                         *reason_code = 1;
8514                                         break;
8515                                 }
8516                                 if (net->flight_size >= net->cwnd) {
8517                                         /* skip this net, no room for data */
8518                                         *reason_code = 2;
8519                                         break;
8520                                 }
8521                                 if ((chk->whoTo != NULL) &&
8522                                     (chk->whoTo != net)) {
8523                                         /* Don't send the chunk on this net */
8524                                         continue;
8525                                 }
8526                                 if (asoc->sctp_cmt_on_off == 0) {
8527                                         if ((asoc->alternate) &&
8528                                             (asoc->alternate != net) &&
8529                                             (chk->whoTo == NULL)) {
8530                                                 continue;
8531                                         } else if ((net != asoc->primary_destination) &&
8532                                                     (asoc->alternate == NULL) &&
8533                                             (chk->whoTo == NULL)) {
8534                                                 continue;
8535                                         }
8536                                 }
8537                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8538                                         /*-
8539                                          * strange, we have a chunk that is
8540                                          * to big for its destination and
8541                                          * yet no fragment ok flag.
8542                                          * Something went wrong when the
8543                                          * PMTU changed...we did not mark
8544                                          * this chunk for some reason?? I
8545                                          * will fix it here by letting IP
8546                                          * fragment it for now and printing
8547                                          * a warning. This really should not
8548                                          * happen ...
8549                                          */
8550                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8551                                             chk->send_size, mtu);
8552                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8553                                 }
8554                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8555                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8556                                         struct sctp_data_chunk *dchkh;
8557
8558                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8559                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8560                                 }
8561                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8562                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8563                                         /* ok we will add this one */
8564
8565                                         /*
8566                                          * Add an AUTH chunk, if chunk
8567                                          * requires it, save the offset into
8568                                          * the chain for AUTH
8569                                          */
8570                                         if (data_auth_reqd) {
8571                                                 if (auth == NULL) {
8572                                                         outchain = sctp_add_auth_chunk(outchain,
8573                                                             &endoutchain,
8574                                                             &auth,
8575                                                             &auth_offset,
8576                                                             stcb,
8577                                                             SCTP_DATA);
8578                                                         auth_keyid = chk->auth_keyid;
8579                                                         override_ok = 0;
8580                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8581                                                 } else if (override_ok) {
8582                                                         /*
8583                                                          * use this data's
8584                                                          * keyid
8585                                                          */
8586                                                         auth_keyid = chk->auth_keyid;
8587                                                         override_ok = 0;
8588                                                 } else if (auth_keyid != chk->auth_keyid) {
8589                                                         /*
8590                                                          * different keyid,
8591                                                          * so done bundling
8592                                                          */
8593                                                         break;
8594                                                 }
8595                                         }
8596                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8597                                             chk->send_size, chk->copy_by_ref);
8598                                         if (outchain == NULL) {
8599                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8600                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8601                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8602                                                 }
8603                                                 *reason_code = 3;
8604                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8605                                                 return (ENOMEM);
8606                                         }
8607                                         /* upate our MTU size */
8608                                         /* Do clear IP_DF ? */
8609                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8610                                                 no_fragmentflg = 0;
8611                                         }
8612                                         /* unsigned subtraction of mtu */
8613                                         if (mtu > chk->send_size)
8614                                                 mtu -= chk->send_size;
8615                                         else
8616                                                 mtu = 0;
8617                                         /* unsigned subtraction of r_mtu */
8618                                         if (r_mtu > chk->send_size)
8619                                                 r_mtu -= chk->send_size;
8620                                         else
8621                                                 r_mtu = 0;
8622
8623                                         to_out += chk->send_size;
8624                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8625 #ifdef INVARIANTS
8626                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8627 #else
8628                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8629                                                     mx_mtu, to_out);
8630 #endif
8631                                         }
8632                                         chk->window_probe = 0;
8633                                         data_list[bundle_at++] = chk;
8634                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8635                                                 break;
8636                                         }
8637                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8638                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8639                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8640                                                 } else {
8641                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8642                                                 }
8643                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8644                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8645                                                         /*
8646                                                          * Count number of
8647                                                          * user msg's that
8648                                                          * were fragmented
8649                                                          * we do this by
8650                                                          * counting when we
8651                                                          * see a LAST
8652                                                          * fragment only.
8653                                                          */
8654                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8655                                         }
8656                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8657                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8658                                                         data_list[0]->window_probe = 1;
8659                                                         net->window_probe = 1;
8660                                                 }
8661                                                 break;
8662                                         }
8663                                 } else {
8664                                         /*
8665                                          * Must be sent in order of the
8666                                          * TSN's (on a network)
8667                                          */
8668                                         break;
8669                                 }
8670                         }       /* for (chunk gather loop for this net) */
8671                 }               /* if asoc.state OPEN */
8672 no_data_fill:
8673                 /* Is there something to send for this destination? */
8674                 if (outchain) {
8675                         /* We may need to start a control timer or two */
8676                         if (asconf) {
8677                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8678                                     stcb, net);
8679                                 /*
8680                                  * do NOT clear the asconf flag as it is
8681                                  * used to do appropriate source address
8682                                  * selection.
8683                                  */
8684                         }
8685                         if (cookie) {
8686                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8687                                 cookie = 0;
8688                         }
8689                         /* must start a send timer if data is being sent */
8690                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8691                                 /*
8692                                  * no timer running on this destination
8693                                  * restart it.
8694                                  */
8695                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8696                         }
8697                         /* Now send it, if there is anything to send :> */
8698                         if ((error = sctp_lowlevel_chunk_output(inp,
8699                             stcb,
8700                             net,
8701                             (struct sockaddr *)&net->ro._l_addr,
8702                             outchain,
8703                             auth_offset,
8704                             auth,
8705                             auth_keyid,
8706                             no_fragmentflg,
8707                             bundle_at,
8708                             asconf,
8709                             inp->sctp_lport, stcb->rport,
8710                             htonl(stcb->asoc.peer_vtag),
8711                             net->port, NULL,
8712                             0, 0,
8713                             so_locked))) {
8714                                 /* error, we could not output */
8715                                 if (error == ENOBUFS) {
8716                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8717                                         asoc->ifp_had_enobuf = 1;
8718                                 }
8719                                 if (from_where == 0) {
8720                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8721                                 }
8722                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8723                                 if (hbflag) {
8724                                         if (*now_filled == 0) {
8725                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8726                                                 *now_filled = 1;
8727                                                 *now = net->last_sent_time;
8728                                         } else {
8729                                                 net->last_sent_time = *now;
8730                                         }
8731                                         hbflag = 0;
8732                                 }
8733                                 if (error == EHOSTUNREACH) {
8734                                         /*
8735                                          * Destination went unreachable
8736                                          * during this send
8737                                          */
8738                                         sctp_move_chunks_from_net(stcb, net);
8739                                 }
8740                                 *reason_code = 6;
8741                                 /*-
8742                                  * I add this line to be paranoid. As far as
8743                                  * I can tell the continue, takes us back to
8744                                  * the top of the for, but just to make sure
8745                                  * I will reset these again here.
8746                                  */
8747                                 ctl_cnt = bundle_at = 0;
8748                                 continue;       /* This takes us back to the
8749                                                  * for() for the nets. */
8750                         } else {
8751                                 asoc->ifp_had_enobuf = 0;
8752                         }
8753                         endoutchain = NULL;
8754                         auth = NULL;
8755                         auth_offset = 0;
8756                         if (bundle_at || hbflag) {
8757                                 /* For data/asconf and hb set time */
8758                                 if (*now_filled == 0) {
8759                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8760                                         *now_filled = 1;
8761                                         *now = net->last_sent_time;
8762                                 } else {
8763                                         net->last_sent_time = *now;
8764                                 }
8765                         }
8766                         if (!no_out_cnt) {
8767                                 *num_out += (ctl_cnt + bundle_at);
8768                         }
8769                         if (bundle_at) {
8770                                 /* setup for a RTO measurement */
8771                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8772                                 /* fill time if not already filled */
8773                                 if (*now_filled == 0) {
8774                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8775                                         *now_filled = 1;
8776                                         *now = asoc->time_last_sent;
8777                                 } else {
8778                                         asoc->time_last_sent = *now;
8779                                 }
8780                                 if (net->rto_needed) {
8781                                         data_list[0]->do_rtt = 1;
8782                                         net->rto_needed = 0;
8783                                 }
8784                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8785                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8786                         }
8787                         if (one_chunk) {
8788                                 break;
8789                         }
8790                 }
8791                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8792                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8793                 }
8794         }
8795         if (old_start_at == NULL) {
8796                 old_start_at = start_at;
8797                 start_at = TAILQ_FIRST(&asoc->nets);
8798                 if (old_start_at)
8799                         goto again_one_more_time;
8800         }
8801         /*
8802          * At the end there should be no NON timed chunks hanging on this
8803          * queue.
8804          */
8805         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8806                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8807         }
8808         if ((*num_out == 0) && (*reason_code == 0)) {
8809                 *reason_code = 4;
8810         } else {
8811                 *reason_code = 5;
8812         }
8813         sctp_clean_up_ctl(stcb, asoc, so_locked);
8814         return (0);
8815 }
8816
8817 void
8818 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8819 {
8820         /*-
8821          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8822          * the control chunk queue.
8823          */
8824         struct sctp_chunkhdr *hdr;
8825         struct sctp_tmit_chunk *chk;
8826         struct mbuf *mat;
8827
8828         SCTP_TCB_LOCK_ASSERT(stcb);
8829         sctp_alloc_a_chunk(stcb, chk);
8830         if (chk == NULL) {
8831                 /* no memory */
8832                 sctp_m_freem(op_err);
8833                 return;
8834         }
8835         chk->copy_by_ref = 0;
8836         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8837         if (op_err == NULL) {
8838                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8839                 return;
8840         }
8841         chk->send_size = 0;
8842         mat = op_err;
8843         while (mat != NULL) {
8844                 chk->send_size += SCTP_BUF_LEN(mat);
8845                 mat = SCTP_BUF_NEXT(mat);
8846         }
8847         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8848         chk->rec.chunk_id.can_take_data = 1;
8849         chk->sent = SCTP_DATAGRAM_UNSENT;
8850         chk->snd_count = 0;
8851         chk->flags = 0;
8852         chk->asoc = &stcb->asoc;
8853         chk->data = op_err;
8854         chk->whoTo = NULL;
8855         hdr = mtod(op_err, struct sctp_chunkhdr *);
8856         hdr->chunk_type = SCTP_OPERATION_ERROR;
8857         hdr->chunk_flags = 0;
8858         hdr->chunk_length = htons(chk->send_size);
8859         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8860             chk,
8861             sctp_next);
8862         chk->asoc->ctrl_queue_cnt++;
8863 }
8864
8865 int
8866 sctp_send_cookie_echo(struct mbuf *m,
8867     int offset,
8868     struct sctp_tcb *stcb,
8869     struct sctp_nets *net)
8870 {
8871         /*-
8872          * pull out the cookie and put it at the front of the control chunk
8873          * queue.
8874          */
8875         int at;
8876         struct mbuf *cookie;
8877         struct sctp_paramhdr parm, *phdr;
8878         struct sctp_chunkhdr *hdr;
8879         struct sctp_tmit_chunk *chk;
8880         uint16_t ptype, plen;
8881
8882         /* First find the cookie in the param area */
8883         cookie = NULL;
8884         at = offset + sizeof(struct sctp_init_chunk);
8885
8886         SCTP_TCB_LOCK_ASSERT(stcb);
8887         do {
8888                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8889                 if (phdr == NULL) {
8890                         return (-3);
8891                 }
8892                 ptype = ntohs(phdr->param_type);
8893                 plen = ntohs(phdr->param_length);
8894                 if (ptype == SCTP_STATE_COOKIE) {
8895                         int pad;
8896
8897                         /* found the cookie */
8898                         if ((pad = (plen % 4))) {
8899                                 plen += 4 - pad;
8900                         }
8901                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8902                         if (cookie == NULL) {
8903                                 /* No memory */
8904                                 return (-2);
8905                         }
8906 #ifdef SCTP_MBUF_LOGGING
8907                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8908                                 struct mbuf *mat;
8909
8910                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8911                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8912                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8913                                         }
8914                                 }
8915                         }
8916 #endif
8917                         break;
8918                 }
8919                 at += SCTP_SIZE32(plen);
8920         } while (phdr);
8921         if (cookie == NULL) {
8922                 /* Did not find the cookie */
8923                 return (-3);
8924         }
8925         /* ok, we got the cookie lets change it into a cookie echo chunk */
8926
8927         /* first the change from param to cookie */
8928         hdr = mtod(cookie, struct sctp_chunkhdr *);
8929         hdr->chunk_type = SCTP_COOKIE_ECHO;
8930         hdr->chunk_flags = 0;
8931         /* get the chunk stuff now and place it in the FRONT of the queue */
8932         sctp_alloc_a_chunk(stcb, chk);
8933         if (chk == NULL) {
8934                 /* no memory */
8935                 sctp_m_freem(cookie);
8936                 return (-5);
8937         }
8938         chk->copy_by_ref = 0;
8939         chk->send_size = plen;
8940         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8941         chk->rec.chunk_id.can_take_data = 0;
8942         chk->sent = SCTP_DATAGRAM_UNSENT;
8943         chk->snd_count = 0;
8944         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8945         chk->asoc = &stcb->asoc;
8946         chk->data = cookie;
8947         chk->whoTo = net;
8948         atomic_add_int(&chk->whoTo->ref_count, 1);
8949         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8950         chk->asoc->ctrl_queue_cnt++;
8951         return (0);
8952 }
8953
8954 void
8955 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8956     struct mbuf *m,
8957     int offset,
8958     int chk_length,
8959     struct sctp_nets *net)
8960 {
8961         /*
8962          * take a HB request and make it into a HB ack and send it.
8963          */
8964         struct mbuf *outchain;
8965         struct sctp_chunkhdr *chdr;
8966         struct sctp_tmit_chunk *chk;
8967
8968
8969         if (net == NULL)
8970                 /* must have a net pointer */
8971                 return;
8972
8973         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8974         if (outchain == NULL) {
8975                 /* gak out of memory */
8976                 return;
8977         }
8978 #ifdef SCTP_MBUF_LOGGING
8979         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8980                 struct mbuf *mat;
8981
8982                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
8983                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8984                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8985                         }
8986                 }
8987         }
8988 #endif
8989         chdr = mtod(outchain, struct sctp_chunkhdr *);
8990         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8991         chdr->chunk_flags = 0;
8992         if (chk_length % 4) {
8993                 /* need pad */
8994                 uint32_t cpthis = 0;
8995                 int padlen;
8996
8997                 padlen = 4 - (chk_length % 4);
8998                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8999         }
9000         sctp_alloc_a_chunk(stcb, chk);
9001         if (chk == NULL) {
9002                 /* no memory */
9003                 sctp_m_freem(outchain);
9004                 return;
9005         }
9006         chk->copy_by_ref = 0;
9007         chk->send_size = chk_length;
9008         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9009         chk->rec.chunk_id.can_take_data = 1;
9010         chk->sent = SCTP_DATAGRAM_UNSENT;
9011         chk->snd_count = 0;
9012         chk->flags = 0;
9013         chk->asoc = &stcb->asoc;
9014         chk->data = outchain;
9015         chk->whoTo = net;
9016         atomic_add_int(&chk->whoTo->ref_count, 1);
9017         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9018         chk->asoc->ctrl_queue_cnt++;
9019 }
9020
9021 void
9022 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9023 {
9024         /* formulate and queue a cookie-ack back to sender */
9025         struct mbuf *cookie_ack;
9026         struct sctp_chunkhdr *hdr;
9027         struct sctp_tmit_chunk *chk;
9028
9029         cookie_ack = NULL;
9030         SCTP_TCB_LOCK_ASSERT(stcb);
9031
9032         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9033         if (cookie_ack == NULL) {
9034                 /* no mbuf's */
9035                 return;
9036         }
9037         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9038         sctp_alloc_a_chunk(stcb, chk);
9039         if (chk == NULL) {
9040                 /* no memory */
9041                 sctp_m_freem(cookie_ack);
9042                 return;
9043         }
9044         chk->copy_by_ref = 0;
9045         chk->send_size = sizeof(struct sctp_chunkhdr);
9046         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9047         chk->rec.chunk_id.can_take_data = 1;
9048         chk->sent = SCTP_DATAGRAM_UNSENT;
9049         chk->snd_count = 0;
9050         chk->flags = 0;
9051         chk->asoc = &stcb->asoc;
9052         chk->data = cookie_ack;
9053         if (chk->asoc->last_control_chunk_from != NULL) {
9054                 chk->whoTo = chk->asoc->last_control_chunk_from;
9055                 atomic_add_int(&chk->whoTo->ref_count, 1);
9056         } else {
9057                 chk->whoTo = NULL;
9058         }
9059         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9060         hdr->chunk_type = SCTP_COOKIE_ACK;
9061         hdr->chunk_flags = 0;
9062         hdr->chunk_length = htons(chk->send_size);
9063         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9064         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9065         chk->asoc->ctrl_queue_cnt++;
9066         return;
9067 }
9068
9069
9070 void
9071 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9072 {
9073         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9074         struct mbuf *m_shutdown_ack;
9075         struct sctp_shutdown_ack_chunk *ack_cp;
9076         struct sctp_tmit_chunk *chk;
9077
9078         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9079         if (m_shutdown_ack == NULL) {
9080                 /* no mbuf's */
9081                 return;
9082         }
9083         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9084         sctp_alloc_a_chunk(stcb, chk);
9085         if (chk == NULL) {
9086                 /* no memory */
9087                 sctp_m_freem(m_shutdown_ack);
9088                 return;
9089         }
9090         chk->copy_by_ref = 0;
9091         chk->send_size = sizeof(struct sctp_chunkhdr);
9092         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9093         chk->rec.chunk_id.can_take_data = 1;
9094         chk->sent = SCTP_DATAGRAM_UNSENT;
9095         chk->snd_count = 0;
9096         chk->flags = 0;
9097         chk->asoc = &stcb->asoc;
9098         chk->data = m_shutdown_ack;
9099         chk->whoTo = net;
9100         if (chk->whoTo) {
9101                 atomic_add_int(&chk->whoTo->ref_count, 1);
9102         }
9103         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9104         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9105         ack_cp->ch.chunk_flags = 0;
9106         ack_cp->ch.chunk_length = htons(chk->send_size);
9107         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9108         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9109         chk->asoc->ctrl_queue_cnt++;
9110         return;
9111 }
9112
9113 void
9114 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9115 {
9116         /* formulate and queue a SHUTDOWN to the sender */
9117         struct mbuf *m_shutdown;
9118         struct sctp_shutdown_chunk *shutdown_cp;
9119         struct sctp_tmit_chunk *chk;
9120
9121         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9122         if (m_shutdown == NULL) {
9123                 /* no mbuf's */
9124                 return;
9125         }
9126         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9127         sctp_alloc_a_chunk(stcb, chk);
9128         if (chk == NULL) {
9129                 /* no memory */
9130                 sctp_m_freem(m_shutdown);
9131                 return;
9132         }
9133         chk->copy_by_ref = 0;
9134         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9135         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9136         chk->rec.chunk_id.can_take_data = 1;
9137         chk->sent = SCTP_DATAGRAM_UNSENT;
9138         chk->snd_count = 0;
9139         chk->flags = 0;
9140         chk->asoc = &stcb->asoc;
9141         chk->data = m_shutdown;
9142         chk->whoTo = net;
9143         if (chk->whoTo) {
9144                 atomic_add_int(&chk->whoTo->ref_count, 1);
9145         }
9146         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9147         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9148         shutdown_cp->ch.chunk_flags = 0;
9149         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9150         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9151         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9152         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9153         chk->asoc->ctrl_queue_cnt++;
9154         return;
9155 }
9156
9157 void
9158 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9159 {
9160         /*
9161          * formulate and queue an ASCONF to the peer. ASCONF parameters
9162          * should be queued on the assoc queue.
9163          */
9164         struct sctp_tmit_chunk *chk;
9165         struct mbuf *m_asconf;
9166         int len;
9167
9168         SCTP_TCB_LOCK_ASSERT(stcb);
9169
9170         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9171             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9172                 /* can't send a new one if there is one in flight already */
9173                 return;
9174         }
9175         /* compose an ASCONF chunk, maximum length is PMTU */
9176         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9177         if (m_asconf == NULL) {
9178                 return;
9179         }
9180         sctp_alloc_a_chunk(stcb, chk);
9181         if (chk == NULL) {
9182                 /* no memory */
9183                 sctp_m_freem(m_asconf);
9184                 return;
9185         }
9186         chk->copy_by_ref = 0;
9187         chk->data = m_asconf;
9188         chk->send_size = len;
9189         chk->rec.chunk_id.id = SCTP_ASCONF;
9190         chk->rec.chunk_id.can_take_data = 0;
9191         chk->sent = SCTP_DATAGRAM_UNSENT;
9192         chk->snd_count = 0;
9193         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9194         chk->asoc = &stcb->asoc;
9195         chk->whoTo = net;
9196         if (chk->whoTo) {
9197                 atomic_add_int(&chk->whoTo->ref_count, 1);
9198         }
9199         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9200         chk->asoc->ctrl_queue_cnt++;
9201         return;
9202 }
9203
9204 void
9205 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9206 {
9207         /*
9208          * formulate and queue a asconf-ack back to sender. the asconf-ack
9209          * must be stored in the tcb.
9210          */
9211         struct sctp_tmit_chunk *chk;
9212         struct sctp_asconf_ack *ack, *latest_ack;
9213         struct mbuf *m_ack;
9214         struct sctp_nets *net = NULL;
9215
9216         SCTP_TCB_LOCK_ASSERT(stcb);
9217         /* Get the latest ASCONF-ACK */
9218         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9219         if (latest_ack == NULL) {
9220                 return;
9221         }
9222         if (latest_ack->last_sent_to != NULL &&
9223             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9224                 /* we're doing a retransmission */
9225                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9226                 if (net == NULL) {
9227                         /* no alternate */
9228                         if (stcb->asoc.last_control_chunk_from == NULL) {
9229                                 if (stcb->asoc.alternate) {
9230                                         net = stcb->asoc.alternate;
9231                                 } else {
9232                                         net = stcb->asoc.primary_destination;
9233                                 }
9234                         } else {
9235                                 net = stcb->asoc.last_control_chunk_from;
9236                         }
9237                 }
9238         } else {
9239                 /* normal case */
9240                 if (stcb->asoc.last_control_chunk_from == NULL) {
9241                         if (stcb->asoc.alternate) {
9242                                 net = stcb->asoc.alternate;
9243                         } else {
9244                                 net = stcb->asoc.primary_destination;
9245                         }
9246                 } else {
9247                         net = stcb->asoc.last_control_chunk_from;
9248                 }
9249         }
9250         latest_ack->last_sent_to = net;
9251
9252         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9253                 if (ack->data == NULL) {
9254                         continue;
9255                 }
9256                 /* copy the asconf_ack */
9257                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9258                 if (m_ack == NULL) {
9259                         /* couldn't copy it */
9260                         return;
9261                 }
9262 #ifdef SCTP_MBUF_LOGGING
9263                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9264                         struct mbuf *mat;
9265
9266                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9267                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9268                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9269                                 }
9270                         }
9271                 }
9272 #endif
9273
9274                 sctp_alloc_a_chunk(stcb, chk);
9275                 if (chk == NULL) {
9276                         /* no memory */
9277                         if (m_ack)
9278                                 sctp_m_freem(m_ack);
9279                         return;
9280                 }
9281                 chk->copy_by_ref = 0;
9282
9283                 chk->whoTo = net;
9284                 if (chk->whoTo) {
9285                         atomic_add_int(&chk->whoTo->ref_count, 1);
9286                 }
9287                 chk->data = m_ack;
9288                 chk->send_size = 0;
9289                 /* Get size */
9290                 chk->send_size = ack->len;
9291                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9292                 chk->rec.chunk_id.can_take_data = 1;
9293                 chk->sent = SCTP_DATAGRAM_UNSENT;
9294                 chk->snd_count = 0;
9295                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9296                 chk->asoc = &stcb->asoc;
9297
9298                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9299                 chk->asoc->ctrl_queue_cnt++;
9300         }
9301         return;
9302 }
9303
9304
9305 static int
9306 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9307     struct sctp_tcb *stcb,
9308     struct sctp_association *asoc,
9309     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9310 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9311     SCTP_UNUSED
9312 #endif
9313 )
9314 {
9315         /*-
9316          * send out one MTU of retransmission. If fast_retransmit is
9317          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9318          * rwnd. For a Cookie or Asconf in the control chunk queue we
9319          * retransmit them by themselves.
9320          *
9321          * For data chunks we will pick out the lowest TSN's in the sent_queue
9322          * marked for resend and bundle them all together (up to a MTU of
9323          * destination). The address to send to should have been
9324          * selected/changed where the retransmission was marked (i.e. in FR
9325          * or t3-timeout routines).
9326          */
9327         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9328         struct sctp_tmit_chunk *chk, *fwd;
9329         struct mbuf *m, *endofchain;
9330         struct sctp_nets *net = NULL;
9331         uint32_t tsns_sent = 0;
9332         int no_fragmentflg, bundle_at, cnt_thru;
9333         unsigned int mtu;
9334         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9335         struct sctp_auth_chunk *auth = NULL;
9336         uint32_t auth_offset = 0;
9337         uint16_t auth_keyid;
9338         int override_ok = 1;
9339         int data_auth_reqd = 0;
9340         uint32_t dmtu = 0;
9341
9342         SCTP_TCB_LOCK_ASSERT(stcb);
9343         tmr_started = ctl_cnt = bundle_at = error = 0;
9344         no_fragmentflg = 1;
9345         fwd_tsn = 0;
9346         *cnt_out = 0;
9347         fwd = NULL;
9348         endofchain = m = NULL;
9349         auth_keyid = stcb->asoc.authinfo.active_keyid;
9350 #ifdef SCTP_AUDITING_ENABLED
9351         sctp_audit_log(0xC3, 1);
9352 #endif
9353         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9354             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9355                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9356                     asoc->sent_queue_retran_cnt);
9357                 asoc->sent_queue_cnt = 0;
9358                 asoc->sent_queue_cnt_removeable = 0;
9359                 /* send back 0/0 so we enter normal transmission */
9360                 *cnt_out = 0;
9361                 return (0);
9362         }
9363         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9364                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9365                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9366                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9367                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9368                                 continue;
9369                         }
9370                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9371                                 if (chk != asoc->str_reset) {
9372                                         /*
9373                                          * not eligible for retran if its
9374                                          * not ours
9375                                          */
9376                                         continue;
9377                                 }
9378                         }
9379                         ctl_cnt++;
9380                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9381                                 fwd_tsn = 1;
9382                         }
9383                         /*
9384                          * Add an AUTH chunk, if chunk requires it save the
9385                          * offset into the chain for AUTH
9386                          */
9387                         if ((auth == NULL) &&
9388                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9389                             stcb->asoc.peer_auth_chunks))) {
9390                                 m = sctp_add_auth_chunk(m, &endofchain,
9391                                     &auth, &auth_offset,
9392                                     stcb,
9393                                     chk->rec.chunk_id.id);
9394                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9395                         }
9396                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9397                         break;
9398                 }
9399         }
9400         one_chunk = 0;
9401         cnt_thru = 0;
9402         /* do we have control chunks to retransmit? */
9403         if (m != NULL) {
9404                 /* Start a timer no matter if we suceed or fail */
9405                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9406                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9407                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9408                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9409                 chk->snd_count++;       /* update our count */
9410                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9411                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9412                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9413                     no_fragmentflg, 0, 0,
9414                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9415                     chk->whoTo->port, NULL,
9416                     0, 0,
9417                     so_locked))) {
9418                         SCTP_STAT_INCR(sctps_lowlevelerr);
9419                         return (error);
9420                 }
9421                 endofchain = NULL;
9422                 auth = NULL;
9423                 auth_offset = 0;
9424                 /*
9425                  * We don't want to mark the net->sent time here since this
9426                  * we use this for HB and retrans cannot measure RTT
9427                  */
9428                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9429                 *cnt_out += 1;
9430                 chk->sent = SCTP_DATAGRAM_SENT;
9431                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9432                 if (fwd_tsn == 0) {
9433                         return (0);
9434                 } else {
9435                         /* Clean up the fwd-tsn list */
9436                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9437                         return (0);
9438                 }
9439         }
9440         /*
9441          * Ok, it is just data retransmission we need to do or that and a
9442          * fwd-tsn with it all.
9443          */
9444         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9445                 return (SCTP_RETRAN_DONE);
9446         }
9447         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9448             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9449                 /* not yet open, resend the cookie and that is it */
9450                 return (1);
9451         }
9452 #ifdef SCTP_AUDITING_ENABLED
9453         sctp_auditing(20, inp, stcb, NULL);
9454 #endif
9455         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9456         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9457                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9458                         /* No, not sent to this net or not ready for rtx */
9459                         continue;
9460                 }
9461                 if (chk->data == NULL) {
9462                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9463                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9464                         continue;
9465                 }
9466                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9467                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9468                         /* Gak, we have exceeded max unlucky retran, abort! */
9469                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9470                             chk->snd_count,
9471                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9472                         atomic_add_int(&stcb->asoc.refcnt, 1);
9473                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9474                         SCTP_TCB_LOCK(stcb);
9475                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9476                         return (SCTP_RETRAN_EXIT);
9477                 }
9478                 /* pick up the net */
9479                 net = chk->whoTo;
9480                 switch (net->ro._l_addr.sa.sa_family) {
9481 #ifdef INET
9482                 case AF_INET:
9483                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9484                         break;
9485 #endif
9486 #ifdef INET6
9487                 case AF_INET6:
9488                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9489                         break;
9490 #endif
9491                 default:
9492                         /* TSNH */
9493                         mtu = net->mtu;
9494                         break;
9495                 }
9496
9497                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9498                         /* No room in peers rwnd */
9499                         uint32_t tsn;
9500
9501                         tsn = asoc->last_acked_seq + 1;
9502                         if (tsn == chk->rec.data.TSN_seq) {
9503                                 /*
9504                                  * we make a special exception for this
9505                                  * case. The peer has no rwnd but is missing
9506                                  * the lowest chunk.. which is probably what
9507                                  * is holding up the rwnd.
9508                                  */
9509                                 goto one_chunk_around;
9510                         }
9511                         return (1);
9512                 }
9513 one_chunk_around:
9514                 if (asoc->peers_rwnd < mtu) {
9515                         one_chunk = 1;
9516                         if ((asoc->peers_rwnd == 0) &&
9517                             (asoc->total_flight == 0)) {
9518                                 chk->window_probe = 1;
9519                                 chk->whoTo->window_probe = 1;
9520                         }
9521                 }
9522 #ifdef SCTP_AUDITING_ENABLED
9523                 sctp_audit_log(0xC3, 2);
9524 #endif
9525                 bundle_at = 0;
9526                 m = NULL;
9527                 net->fast_retran_ip = 0;
9528                 if (chk->rec.data.doing_fast_retransmit == 0) {
9529                         /*
9530                          * if no FR in progress skip destination that have
9531                          * flight_size > cwnd.
9532                          */
9533                         if (net->flight_size >= net->cwnd) {
9534                                 continue;
9535                         }
9536                 } else {
9537                         /*
9538                          * Mark the destination net to have FR recovery
9539                          * limits put on it.
9540                          */
9541                         *fr_done = 1;
9542                         net->fast_retran_ip = 1;
9543                 }
9544
9545                 /*
9546                  * if no AUTH is yet included and this chunk requires it,
9547                  * make sure to account for it.  We don't apply the size
9548                  * until the AUTH chunk is actually added below in case
9549                  * there is no room for this chunk.
9550                  */
9551                 if (data_auth_reqd && (auth == NULL)) {
9552                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9553                 } else
9554                         dmtu = 0;
9555
9556                 if ((chk->send_size <= (mtu - dmtu)) ||
9557                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9558                         /* ok we will add this one */
9559                         if (data_auth_reqd) {
9560                                 if (auth == NULL) {
9561                                         m = sctp_add_auth_chunk(m,
9562                                             &endofchain,
9563                                             &auth,
9564                                             &auth_offset,
9565                                             stcb,
9566                                             SCTP_DATA);
9567                                         auth_keyid = chk->auth_keyid;
9568                                         override_ok = 0;
9569                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9570                                 } else if (override_ok) {
9571                                         auth_keyid = chk->auth_keyid;
9572                                         override_ok = 0;
9573                                 } else if (chk->auth_keyid != auth_keyid) {
9574                                         /* different keyid, so done bundling */
9575                                         break;
9576                                 }
9577                         }
9578                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9579                         if (m == NULL) {
9580                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9581                                 return (ENOMEM);
9582                         }
9583                         /* Do clear IP_DF ? */
9584                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9585                                 no_fragmentflg = 0;
9586                         }
9587                         /* upate our MTU size */
9588                         if (mtu > (chk->send_size + dmtu))
9589                                 mtu -= (chk->send_size + dmtu);
9590                         else
9591                                 mtu = 0;
9592                         data_list[bundle_at++] = chk;
9593                         if (one_chunk && (asoc->total_flight <= 0)) {
9594                                 SCTP_STAT_INCR(sctps_windowprobed);
9595                         }
9596                 }
9597                 if (one_chunk == 0) {
9598                         /*
9599                          * now are there anymore forward from chk to pick
9600                          * up?
9601                          */
9602                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9603                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9604                                         /* Nope, not for retran */
9605                                         continue;
9606                                 }
9607                                 if (fwd->whoTo != net) {
9608                                         /* Nope, not the net in question */
9609                                         continue;
9610                                 }
9611                                 if (data_auth_reqd && (auth == NULL)) {
9612                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9613                                 } else
9614                                         dmtu = 0;
9615                                 if (fwd->send_size <= (mtu - dmtu)) {
9616                                         if (data_auth_reqd) {
9617                                                 if (auth == NULL) {
9618                                                         m = sctp_add_auth_chunk(m,
9619                                                             &endofchain,
9620                                                             &auth,
9621                                                             &auth_offset,
9622                                                             stcb,
9623                                                             SCTP_DATA);
9624                                                         auth_keyid = fwd->auth_keyid;
9625                                                         override_ok = 0;
9626                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9627                                                 } else if (override_ok) {
9628                                                         auth_keyid = fwd->auth_keyid;
9629                                                         override_ok = 0;
9630                                                 } else if (fwd->auth_keyid != auth_keyid) {
9631                                                         /*
9632                                                          * different keyid,
9633                                                          * so done bundling
9634                                                          */
9635                                                         break;
9636                                                 }
9637                                         }
9638                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9639                                         if (m == NULL) {
9640                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9641                                                 return (ENOMEM);
9642                                         }
9643                                         /* Do clear IP_DF ? */
9644                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9645                                                 no_fragmentflg = 0;
9646                                         }
9647                                         /* upate our MTU size */
9648                                         if (mtu > (fwd->send_size + dmtu))
9649                                                 mtu -= (fwd->send_size + dmtu);
9650                                         else
9651                                                 mtu = 0;
9652                                         data_list[bundle_at++] = fwd;
9653                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9654                                                 break;
9655                                         }
9656                                 } else {
9657                                         /* can't fit so we are done */
9658                                         break;
9659                                 }
9660                         }
9661                 }
9662                 /* Is there something to send for this destination? */
9663                 if (m) {
9664                         /*
9665                          * No matter if we fail/or suceed we should start a
9666                          * timer. A failure is like a lost IP packet :-)
9667                          */
9668                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9669                                 /*
9670                                  * no timer running on this destination
9671                                  * restart it.
9672                                  */
9673                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9674                                 tmr_started = 1;
9675                         }
9676                         /* Now lets send it, if there is anything to send :> */
9677                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9678                             (struct sockaddr *)&net->ro._l_addr, m,
9679                             auth_offset, auth, auth_keyid,
9680                             no_fragmentflg, 0, 0,
9681                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9682                             net->port, NULL,
9683                             0, 0,
9684                             so_locked))) {
9685                                 /* error, we could not output */
9686                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9687                                 return (error);
9688                         }
9689                         endofchain = NULL;
9690                         auth = NULL;
9691                         auth_offset = 0;
9692                         /* For HB's */
9693                         /*
9694                          * We don't want to mark the net->sent time here
9695                          * since this we use this for HB and retrans cannot
9696                          * measure RTT
9697                          */
9698                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9699
9700                         /* For auto-close */
9701                         cnt_thru++;
9702                         if (*now_filled == 0) {
9703                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9704                                 *now = asoc->time_last_sent;
9705                                 *now_filled = 1;
9706                         } else {
9707                                 asoc->time_last_sent = *now;
9708                         }
9709                         *cnt_out += bundle_at;
9710 #ifdef SCTP_AUDITING_ENABLED
9711                         sctp_audit_log(0xC4, bundle_at);
9712 #endif
9713                         if (bundle_at) {
9714                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9715                         }
9716                         for (i = 0; i < bundle_at; i++) {
9717                                 SCTP_STAT_INCR(sctps_sendretransdata);
9718                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9719                                 /*
9720                                  * When we have a revoked data, and we
9721                                  * retransmit it, then we clear the revoked
9722                                  * flag since this flag dictates if we
9723                                  * subtracted from the fs
9724                                  */
9725                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9726                                         /* Deflate the cwnd */
9727                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9728                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9729                                 }
9730                                 data_list[i]->snd_count++;
9731                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9732                                 /* record the time */
9733                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9734                                 if (data_list[i]->book_size_scale) {
9735                                         /*
9736                                          * need to double the book size on
9737                                          * this one
9738                                          */
9739                                         data_list[i]->book_size_scale = 0;
9740                                         /*
9741                                          * Since we double the booksize, we
9742                                          * must also double the output queue
9743                                          * size, since this get shrunk when
9744                                          * we free by this amount.
9745                                          */
9746                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9747                                         data_list[i]->book_size *= 2;
9748
9749
9750                                 } else {
9751                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9752                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9753                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9754                                         }
9755                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9756                                             (uint32_t) (data_list[i]->send_size +
9757                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9758                                 }
9759                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9760                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9761                                             data_list[i]->whoTo->flight_size,
9762                                             data_list[i]->book_size,
9763                                             (uintptr_t) data_list[i]->whoTo,
9764                                             data_list[i]->rec.data.TSN_seq);
9765                                 }
9766                                 sctp_flight_size_increase(data_list[i]);
9767                                 sctp_total_flight_increase(stcb, data_list[i]);
9768                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9769                                         /* SWS sender side engages */
9770                                         asoc->peers_rwnd = 0;
9771                                 }
9772                                 if ((i == 0) &&
9773                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9774                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9775                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9776                                             (tmr_started == 0)) {
9777                                                 /*-
9778                                                  * ok we just fast-retrans'd
9779                                                  * the lowest TSN, i.e the
9780                                                  * first on the list. In
9781                                                  * this case we want to give
9782                                                  * some more time to get a
9783                                                  * SACK back without a
9784                                                  * t3-expiring.
9785                                                  */
9786                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9787                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9788                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9789                                         }
9790                                 }
9791                         }
9792                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9793                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9794                         }
9795 #ifdef SCTP_AUDITING_ENABLED
9796                         sctp_auditing(21, inp, stcb, NULL);
9797 #endif
9798                 } else {
9799                         /* None will fit */
9800                         return (1);
9801                 }
9802                 if (asoc->sent_queue_retran_cnt <= 0) {
9803                         /* all done we have no more to retran */
9804                         asoc->sent_queue_retran_cnt = 0;
9805                         break;
9806                 }
9807                 if (one_chunk) {
9808                         /* No more room in rwnd */
9809                         return (1);
9810                 }
9811                 /* stop the for loop here. we sent out a packet */
9812                 break;
9813         }
9814         return (0);
9815 }
9816
9817 static void
9818 sctp_timer_validation(struct sctp_inpcb *inp,
9819     struct sctp_tcb *stcb,
9820     struct sctp_association *asoc)
9821 {
9822         struct sctp_nets *net;
9823
9824         /* Validate that a timer is running somewhere */
9825         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9826                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9827                         /* Here is a timer */
9828                         return;
9829                 }
9830         }
9831         SCTP_TCB_LOCK_ASSERT(stcb);
9832         /* Gak, we did not have a timer somewhere */
9833         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9834         if (asoc->alternate) {
9835                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9836         } else {
9837                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9838         }
9839         return;
9840 }
9841
9842 void
9843 sctp_chunk_output(struct sctp_inpcb *inp,
9844     struct sctp_tcb *stcb,
9845     int from_where,
9846     int so_locked
9847 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9848     SCTP_UNUSED
9849 #endif
9850 )
9851 {
9852         /*-
9853          * Ok this is the generic chunk service queue. we must do the
9854          * following:
9855          * - See if there are retransmits pending, if so we must
9856          *   do these first.
9857          * - Service the stream queue that is next, moving any
9858          *   message (note I must get a complete message i.e.
9859          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9860          *   TSN's
9861          * - Check to see if the cwnd/rwnd allows any output, if so we
9862          *   go ahead and fomulate and send the low level chunks. Making sure
9863          *   to combine any control in the control chunk queue also.
9864          */
9865         struct sctp_association *asoc;
9866         struct sctp_nets *net;
9867         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9868         unsigned int burst_cnt = 0;
9869         struct timeval now;
9870         int now_filled = 0;
9871         int nagle_on;
9872         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9873         int un_sent = 0;
9874         int fr_done;
9875         unsigned int tot_frs = 0;
9876
9877         asoc = &stcb->asoc;
9878         /* The Nagle algorithm is only applied when handling a send call. */
9879         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9880                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9881                         nagle_on = 0;
9882                 } else {
9883                         nagle_on = 1;
9884                 }
9885         } else {
9886                 nagle_on = 0;
9887         }
9888         SCTP_TCB_LOCK_ASSERT(stcb);
9889
9890         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9891
9892         if ((un_sent <= 0) &&
9893             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9894             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9895             (asoc->sent_queue_retran_cnt == 0)) {
9896                 /* Nothing to do unless there is something to be sent left */
9897                 return;
9898         }
9899         /*
9900          * Do we have something to send, data or control AND a sack timer
9901          * running, if so piggy-back the sack.
9902          */
9903         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9904                 sctp_send_sack(stcb, so_locked);
9905                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9906         }
9907         while (asoc->sent_queue_retran_cnt) {
9908                 /*-
9909                  * Ok, it is retransmission time only, we send out only ONE
9910                  * packet with a single call off to the retran code.
9911                  */
9912                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9913                         /*-
9914                          * Special hook for handling cookiess discarded
9915                          * by peer that carried data. Send cookie-ack only
9916                          * and then the next call with get the retran's.
9917                          */
9918                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9919                             from_where,
9920                             &now, &now_filled, frag_point, so_locked);
9921                         return;
9922                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9923                         /* if its not from a HB then do it */
9924                         fr_done = 0;
9925                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9926                         if (fr_done) {
9927                                 tot_frs++;
9928                         }
9929                 } else {
9930                         /*
9931                          * its from any other place, we don't allow retran
9932                          * output (only control)
9933                          */
9934                         ret = 1;
9935                 }
9936                 if (ret > 0) {
9937                         /* Can't send anymore */
9938                         /*-
9939                          * now lets push out control by calling med-level
9940                          * output once. this assures that we WILL send HB's
9941                          * if queued too.
9942                          */
9943                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9944                             from_where,
9945                             &now, &now_filled, frag_point, so_locked);
9946 #ifdef SCTP_AUDITING_ENABLED
9947                         sctp_auditing(8, inp, stcb, NULL);
9948 #endif
9949                         sctp_timer_validation(inp, stcb, asoc);
9950                         return;
9951                 }
9952                 if (ret < 0) {
9953                         /*-
9954                          * The count was off.. retran is not happening so do
9955                          * the normal retransmission.
9956                          */
9957 #ifdef SCTP_AUDITING_ENABLED
9958                         sctp_auditing(9, inp, stcb, NULL);
9959 #endif
9960                         if (ret == SCTP_RETRAN_EXIT) {
9961                                 return;
9962                         }
9963                         break;
9964                 }
9965                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9966                         /* Only one transmission allowed out of a timeout */
9967 #ifdef SCTP_AUDITING_ENABLED
9968                         sctp_auditing(10, inp, stcb, NULL);
9969 #endif
9970                         /* Push out any control */
9971                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9972                             &now, &now_filled, frag_point, so_locked);
9973                         return;
9974                 }
9975                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9976                         /* Hit FR burst limit */
9977                         return;
9978                 }
9979                 if ((num_out == 0) && (ret == 0)) {
9980                         /* No more retrans to send */
9981                         break;
9982                 }
9983         }
9984 #ifdef SCTP_AUDITING_ENABLED
9985         sctp_auditing(12, inp, stcb, NULL);
9986 #endif
9987         /* Check for bad destinations, if they exist move chunks around. */
9988         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9989                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9990                         /*-
9991                          * if possible move things off of this address we
9992                          * still may send below due to the dormant state but
9993                          * we try to find an alternate address to send to
9994                          * and if we have one we move all queued data on the
9995                          * out wheel to this alternate address.
9996                          */
9997                         if (net->ref_count > 1)
9998                                 sctp_move_chunks_from_net(stcb, net);
9999                 } else {
10000                         /*-
10001                          * if ((asoc->sat_network) || (net->addr_is_local))
10002                          * { burst_limit = asoc->max_burst *
10003                          * SCTP_SAT_NETWORK_BURST_INCR; }
10004                          */
10005                         if (asoc->max_burst > 0) {
10006                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10007                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10008                                                 /*
10009                                                  * JRS - Use the congestion
10010                                                  * control given in the
10011                                                  * congestion control module
10012                                                  */
10013                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10014                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10015                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10016                                                 }
10017                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10018                                         }
10019                                         net->fast_retran_ip = 0;
10020                                 } else {
10021                                         if (net->flight_size == 0) {
10022                                                 /*
10023                                                  * Should be decaying the
10024                                                  * cwnd here
10025                                                  */
10026                                                 ;
10027                                         }
10028                                 }
10029                         }
10030                 }
10031
10032         }
10033         burst_cnt = 0;
10034         do {
10035                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10036                     &reason_code, 0, from_where,
10037                     &now, &now_filled, frag_point, so_locked);
10038                 if (error) {
10039                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10040                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10041                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10042                         }
10043                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10044                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10045                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10046                         }
10047                         break;
10048                 }
10049                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10050
10051                 tot_out += num_out;
10052                 burst_cnt++;
10053                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10054                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10055                         if (num_out == 0) {
10056                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10057                         }
10058                 }
10059                 if (nagle_on) {
10060                         /*
10061                          * When the Nagle algorithm is used, look at how
10062                          * much is unsent, then if its smaller than an MTU
10063                          * and we have data in flight we stop, except if we
10064                          * are handling a fragmented user message.
10065                          */
10066                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10067                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10068                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10069                             (stcb->asoc.total_flight > 0) &&
10070                             ((stcb->asoc.locked_on_sending == NULL) ||
10071                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10072                                 break;
10073                         }
10074                 }
10075                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10076                     TAILQ_EMPTY(&asoc->send_queue) &&
10077                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10078                         /* Nothing left to send */
10079                         break;
10080                 }
10081                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10082                         /* Nothing left to send */
10083                         break;
10084                 }
10085         } while (num_out &&
10086             ((asoc->max_burst == 0) ||
10087             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10088             (burst_cnt < asoc->max_burst)));
10089
10090         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10091                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10092                         SCTP_STAT_INCR(sctps_maxburstqueued);
10093                         asoc->burst_limit_applied = 1;
10094                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10095                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10096                         }
10097                 } else {
10098                         asoc->burst_limit_applied = 0;
10099                 }
10100         }
10101         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10102                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10103         }
10104         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10105             tot_out);
10106
10107         /*-
10108          * Now we need to clean up the control chunk chain if a ECNE is on
10109          * it. It must be marked as UNSENT again so next call will continue
10110          * to send it until such time that we get a CWR, to remove it.
10111          */
10112         if (stcb->asoc.ecn_echo_cnt_onq)
10113                 sctp_fix_ecn_echo(asoc);
10114         return;
10115 }
10116
10117
10118 int
10119 sctp_output(
10120     struct sctp_inpcb *inp,
10121     struct mbuf *m,
10122     struct sockaddr *addr,
10123     struct mbuf *control,
10124     struct thread *p,
10125     int flags)
10126 {
10127         if (inp == NULL) {
10128                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10129                 return (EINVAL);
10130         }
10131         if (inp->sctp_socket == NULL) {
10132                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10133                 return (EINVAL);
10134         }
10135         return (sctp_sosend(inp->sctp_socket,
10136             addr,
10137             (struct uio *)NULL,
10138             m,
10139             control,
10140             flags, p
10141             ));
10142 }
10143
10144 void
10145 send_forward_tsn(struct sctp_tcb *stcb,
10146     struct sctp_association *asoc)
10147 {
10148         struct sctp_tmit_chunk *chk;
10149         struct sctp_forward_tsn_chunk *fwdtsn;
10150         uint32_t advance_peer_ack_point;
10151
10152         SCTP_TCB_LOCK_ASSERT(stcb);
10153         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10154                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10155                         /* mark it to unsent */
10156                         chk->sent = SCTP_DATAGRAM_UNSENT;
10157                         chk->snd_count = 0;
10158                         /* Do we correct its output location? */
10159                         if (chk->whoTo) {
10160                                 sctp_free_remote_addr(chk->whoTo);
10161                                 chk->whoTo = NULL;
10162                         }
10163                         goto sctp_fill_in_rest;
10164                 }
10165         }
10166         /* Ok if we reach here we must build one */
10167         sctp_alloc_a_chunk(stcb, chk);
10168         if (chk == NULL) {
10169                 return;
10170         }
10171         asoc->fwd_tsn_cnt++;
10172         chk->copy_by_ref = 0;
10173         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10174         chk->rec.chunk_id.can_take_data = 0;
10175         chk->asoc = asoc;
10176         chk->whoTo = NULL;
10177         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10178         if (chk->data == NULL) {
10179                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10180                 return;
10181         }
10182         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10183         chk->sent = SCTP_DATAGRAM_UNSENT;
10184         chk->snd_count = 0;
10185         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10186         asoc->ctrl_queue_cnt++;
10187 sctp_fill_in_rest:
10188         /*-
10189          * Here we go through and fill out the part that deals with
10190          * stream/seq of the ones we skip.
10191          */
10192         SCTP_BUF_LEN(chk->data) = 0;
10193         {
10194                 struct sctp_tmit_chunk *at, *tp1, *last;
10195                 struct sctp_strseq *strseq;
10196                 unsigned int cnt_of_space, i, ovh;
10197                 unsigned int space_needed;
10198                 unsigned int cnt_of_skipped = 0;
10199
10200                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10201                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10202                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10203                                 /* no more to look at */
10204                                 break;
10205                         }
10206                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10207                                 /* We don't report these */
10208                                 continue;
10209                         }
10210                         cnt_of_skipped++;
10211                 }
10212                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10213                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10214
10215                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10216
10217                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10218                         ovh = SCTP_MIN_OVERHEAD;
10219                 } else {
10220                         ovh = SCTP_MIN_V4_OVERHEAD;
10221                 }
10222                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10223                         /* trim to a mtu size */
10224                         cnt_of_space = asoc->smallest_mtu - ovh;
10225                 }
10226                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10227                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10228                             0xff, 0, cnt_of_skipped,
10229                             asoc->advanced_peer_ack_point);
10230
10231                 }
10232                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10233                 if (cnt_of_space < space_needed) {
10234                         /*-
10235                          * ok we must trim down the chunk by lowering the
10236                          * advance peer ack point.
10237                          */
10238                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10239                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10240                                     0xff, 0xff, cnt_of_space,
10241                                     space_needed);
10242                         }
10243                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10244                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10245                         /*-
10246                          * Go through and find the TSN that will be the one
10247                          * we report.
10248                          */
10249                         at = TAILQ_FIRST(&asoc->sent_queue);
10250                         if (at != NULL) {
10251                                 for (i = 0; i < cnt_of_skipped; i++) {
10252                                         tp1 = TAILQ_NEXT(at, sctp_next);
10253                                         if (tp1 == NULL) {
10254                                                 break;
10255                                         }
10256                                         at = tp1;
10257                                 }
10258                         }
10259                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10260                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10261                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10262                                     asoc->advanced_peer_ack_point);
10263                         }
10264                         last = at;
10265                         /*-
10266                          * last now points to last one I can report, update
10267                          * peer ack point
10268                          */
10269                         if (last)
10270                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10271                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10272                             cnt_of_skipped * sizeof(struct sctp_strseq);
10273                 }
10274                 chk->send_size = space_needed;
10275                 /* Setup the chunk */
10276                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10277                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10278                 fwdtsn->ch.chunk_flags = 0;
10279                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10280                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10281                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10282                 fwdtsn++;
10283                 /*-
10284                  * Move pointer to after the fwdtsn and transfer to the
10285                  * strseq pointer.
10286                  */
10287                 strseq = (struct sctp_strseq *)fwdtsn;
10288                 /*-
10289                  * Now populate the strseq list. This is done blindly
10290                  * without pulling out duplicate stream info. This is
10291                  * inefficent but won't harm the process since the peer will
10292                  * look at these in sequence and will thus release anything.
10293                  * It could mean we exceed the PMTU and chop off some that
10294                  * we could have included.. but this is unlikely (aka 1432/4
10295                  * would mean 300+ stream seq's would have to be reported in
10296                  * one FWD-TSN. With a bit of work we can later FIX this to
10297                  * optimize and pull out duplcates.. but it does add more
10298                  * overhead. So for now... not!
10299                  */
10300                 at = TAILQ_FIRST(&asoc->sent_queue);
10301                 for (i = 0; i < cnt_of_skipped; i++) {
10302                         tp1 = TAILQ_NEXT(at, sctp_next);
10303                         if (tp1 == NULL)
10304                                 break;
10305                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10306                                 /* We don't report these */
10307                                 i--;
10308                                 at = tp1;
10309                                 continue;
10310                         }
10311                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10312                                 at->rec.data.fwd_tsn_cnt = 0;
10313                         }
10314                         strseq->stream = ntohs(at->rec.data.stream_number);
10315                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10316                         strseq++;
10317                         at = tp1;
10318                 }
10319         }
10320         return;
10321 }
10322
10323 void
10324 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10325 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10326     SCTP_UNUSED
10327 #endif
10328 )
10329 {
10330         /*-
10331          * Queue up a SACK or NR-SACK in the control queue.
10332          * We must first check to see if a SACK or NR-SACK is
10333          * somehow on the control queue.
10334          * If so, we will take and and remove the old one.
10335          */
10336         struct sctp_association *asoc;
10337         struct sctp_tmit_chunk *chk, *a_chk;
10338         struct sctp_sack_chunk *sack;
10339         struct sctp_nr_sack_chunk *nr_sack;
10340         struct sctp_gap_ack_block *gap_descriptor;
10341         struct sack_track *selector;
10342         int mergeable = 0;
10343         int offset;
10344         caddr_t limit;
10345         uint32_t *dup;
10346         int limit_reached = 0;
10347         unsigned int i, siz, j;
10348         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10349         int num_dups = 0;
10350         int space_req;
10351         uint32_t highest_tsn;
10352         uint8_t flags;
10353         uint8_t type;
10354         uint8_t tsn_map;
10355
10356         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10357             (stcb->asoc.peer_supports_nr_sack == 1)) {
10358                 type = SCTP_NR_SELECTIVE_ACK;
10359         } else {
10360                 type = SCTP_SELECTIVE_ACK;
10361         }
10362         a_chk = NULL;
10363         asoc = &stcb->asoc;
10364         SCTP_TCB_LOCK_ASSERT(stcb);
10365         if (asoc->last_data_chunk_from == NULL) {
10366                 /* Hmm we never received anything */
10367                 return;
10368         }
10369         sctp_slide_mapping_arrays(stcb);
10370         sctp_set_rwnd(stcb, asoc);
10371         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10372                 if (chk->rec.chunk_id.id == type) {
10373                         /* Hmm, found a sack already on queue, remove it */
10374                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10375                         asoc->ctrl_queue_cnt--;
10376                         a_chk = chk;
10377                         if (a_chk->data) {
10378                                 sctp_m_freem(a_chk->data);
10379                                 a_chk->data = NULL;
10380                         }
10381                         if (a_chk->whoTo) {
10382                                 sctp_free_remote_addr(a_chk->whoTo);
10383                                 a_chk->whoTo = NULL;
10384                         }
10385                         break;
10386                 }
10387         }
10388         if (a_chk == NULL) {
10389                 sctp_alloc_a_chunk(stcb, a_chk);
10390                 if (a_chk == NULL) {
10391                         /* No memory so we drop the idea, and set a timer */
10392                         if (stcb->asoc.delayed_ack) {
10393                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10394                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10395                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10396                                     stcb->sctp_ep, stcb, NULL);
10397                         } else {
10398                                 stcb->asoc.send_sack = 1;
10399                         }
10400                         return;
10401                 }
10402                 a_chk->copy_by_ref = 0;
10403                 a_chk->rec.chunk_id.id = type;
10404                 a_chk->rec.chunk_id.can_take_data = 1;
10405         }
10406         /* Clear our pkt counts */
10407         asoc->data_pkts_seen = 0;
10408
10409         a_chk->asoc = asoc;
10410         a_chk->snd_count = 0;
10411         a_chk->send_size = 0;   /* fill in later */
10412         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10413         a_chk->whoTo = NULL;
10414
10415         if ((asoc->numduptsns) ||
10416             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10417                 /*-
10418                  * Ok, we have some duplicates or the destination for the
10419                  * sack is unreachable, lets see if we can select an
10420                  * alternate than asoc->last_data_chunk_from
10421                  */
10422                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10423                     (asoc->used_alt_onsack > asoc->numnets)) {
10424                         /* We used an alt last time, don't this time */
10425                         a_chk->whoTo = NULL;
10426                 } else {
10427                         asoc->used_alt_onsack++;
10428                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10429                 }
10430                 if (a_chk->whoTo == NULL) {
10431                         /* Nope, no alternate */
10432                         a_chk->whoTo = asoc->last_data_chunk_from;
10433                         asoc->used_alt_onsack = 0;
10434                 }
10435         } else {
10436                 /*
10437                  * No duplicates so we use the last place we received data
10438                  * from.
10439                  */
10440                 asoc->used_alt_onsack = 0;
10441                 a_chk->whoTo = asoc->last_data_chunk_from;
10442         }
10443         if (a_chk->whoTo) {
10444                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10445         }
10446         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10447                 highest_tsn = asoc->highest_tsn_inside_map;
10448         } else {
10449                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10450         }
10451         if (highest_tsn == asoc->cumulative_tsn) {
10452                 /* no gaps */
10453                 if (type == SCTP_SELECTIVE_ACK) {
10454                         space_req = sizeof(struct sctp_sack_chunk);
10455                 } else {
10456                         space_req = sizeof(struct sctp_nr_sack_chunk);
10457                 }
10458         } else {
10459                 /* gaps get a cluster */
10460                 space_req = MCLBYTES;
10461         }
10462         /* Ok now lets formulate a MBUF with our sack */
10463         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10464         if ((a_chk->data == NULL) ||
10465             (a_chk->whoTo == NULL)) {
10466                 /* rats, no mbuf memory */
10467                 if (a_chk->data) {
10468                         /* was a problem with the destination */
10469                         sctp_m_freem(a_chk->data);
10470                         a_chk->data = NULL;
10471                 }
10472                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10473                 /* sa_ignore NO_NULL_CHK */
10474                 if (stcb->asoc.delayed_ack) {
10475                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10476                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10477                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10478                             stcb->sctp_ep, stcb, NULL);
10479                 } else {
10480                         stcb->asoc.send_sack = 1;
10481                 }
10482                 return;
10483         }
10484         /* ok, lets go through and fill it in */
10485         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10486         space = M_TRAILINGSPACE(a_chk->data);
10487         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10488                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10489         }
10490         limit = mtod(a_chk->data, caddr_t);
10491         limit += space;
10492
10493         flags = 0;
10494
10495         if ((asoc->sctp_cmt_on_off > 0) &&
10496             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10497                 /*-
10498                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10499                  * received, then set high bit to 1, else 0. Reset
10500                  * pkts_rcvd.
10501                  */
10502                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10503                 asoc->cmt_dac_pkts_rcvd = 0;
10504         }
10505 #ifdef SCTP_ASOCLOG_OF_TSNS
10506         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10507         stcb->asoc.cumack_log_atsnt++;
10508         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10509                 stcb->asoc.cumack_log_atsnt = 0;
10510         }
10511 #endif
10512         /* reset the readers interpretation */
10513         stcb->freed_by_sorcv_sincelast = 0;
10514
10515         if (type == SCTP_SELECTIVE_ACK) {
10516                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10517                 nr_sack = NULL;
10518                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10519                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10520                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10521                 } else {
10522                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10523                 }
10524         } else {
10525                 sack = NULL;
10526                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10527                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10528                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10529                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10530                 } else {
10531                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10532                 }
10533         }
10534
10535         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10536                 offset = 1;
10537         } else {
10538                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10539         }
10540         if (((type == SCTP_SELECTIVE_ACK) &&
10541             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10542             ((type == SCTP_NR_SELECTIVE_ACK) &&
10543             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10544                 /* we have a gap .. maybe */
10545                 for (i = 0; i < siz; i++) {
10546                         tsn_map = asoc->mapping_array[i];
10547                         if (type == SCTP_SELECTIVE_ACK) {
10548                                 tsn_map |= asoc->nr_mapping_array[i];
10549                         }
10550                         if (i == 0) {
10551                                 /*
10552                                  * Clear all bits corresponding to TSNs
10553                                  * smaller or equal to the cumulative TSN.
10554                                  */
10555                                 tsn_map &= (~0 << (1 - offset));
10556                         }
10557                         selector = &sack_array[tsn_map];
10558                         if (mergeable && selector->right_edge) {
10559                                 /*
10560                                  * Backup, left and right edges were ok to
10561                                  * merge.
10562                                  */
10563                                 num_gap_blocks--;
10564                                 gap_descriptor--;
10565                         }
10566                         if (selector->num_entries == 0)
10567                                 mergeable = 0;
10568                         else {
10569                                 for (j = 0; j < selector->num_entries; j++) {
10570                                         if (mergeable && selector->right_edge) {
10571                                                 /*
10572                                                  * do a merge by NOT setting
10573                                                  * the left side
10574                                                  */
10575                                                 mergeable = 0;
10576                                         } else {
10577                                                 /*
10578                                                  * no merge, set the left
10579                                                  * side
10580                                                  */
10581                                                 mergeable = 0;
10582                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10583                                         }
10584                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10585                                         num_gap_blocks++;
10586                                         gap_descriptor++;
10587                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10588                                                 /* no more room */
10589                                                 limit_reached = 1;
10590                                                 break;
10591                                         }
10592                                 }
10593                                 if (selector->left_edge) {
10594                                         mergeable = 1;
10595                                 }
10596                         }
10597                         if (limit_reached) {
10598                                 /* Reached the limit stop */
10599                                 break;
10600                         }
10601                         offset += 8;
10602                 }
10603         }
10604         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10605             (limit_reached == 0)) {
10606
10607                 mergeable = 0;
10608
10609                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10610                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10611                 } else {
10612                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10613                 }
10614
10615                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10616                         offset = 1;
10617                 } else {
10618                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10619                 }
10620                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10621                         /* we have a gap .. maybe */
10622                         for (i = 0; i < siz; i++) {
10623                                 tsn_map = asoc->nr_mapping_array[i];
10624                                 if (i == 0) {
10625                                         /*
10626                                          * Clear all bits corresponding to
10627                                          * TSNs smaller or equal to the
10628                                          * cumulative TSN.
10629                                          */
10630                                         tsn_map &= (~0 << (1 - offset));
10631                                 }
10632                                 selector = &sack_array[tsn_map];
10633                                 if (mergeable && selector->right_edge) {
10634                                         /*
10635                                          * Backup, left and right edges were
10636                                          * ok to merge.
10637                                          */
10638                                         num_nr_gap_blocks--;
10639                                         gap_descriptor--;
10640                                 }
10641                                 if (selector->num_entries == 0)
10642                                         mergeable = 0;
10643                                 else {
10644                                         for (j = 0; j < selector->num_entries; j++) {
10645                                                 if (mergeable && selector->right_edge) {
10646                                                         /*
10647                                                          * do a merge by NOT
10648                                                          * setting the left
10649                                                          * side
10650                                                          */
10651                                                         mergeable = 0;
10652                                                 } else {
10653                                                         /*
10654                                                          * no merge, set the
10655                                                          * left side
10656                                                          */
10657                                                         mergeable = 0;
10658                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10659                                                 }
10660                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10661                                                 num_nr_gap_blocks++;
10662                                                 gap_descriptor++;
10663                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10664                                                         /* no more room */
10665                                                         limit_reached = 1;
10666                                                         break;
10667                                                 }
10668                                         }
10669                                         if (selector->left_edge) {
10670                                                 mergeable = 1;
10671                                         }
10672                                 }
10673                                 if (limit_reached) {
10674                                         /* Reached the limit stop */
10675                                         break;
10676                                 }
10677                                 offset += 8;
10678                         }
10679                 }
10680         }
10681         /* now we must add any dups we are going to report. */
10682         if ((limit_reached == 0) && (asoc->numduptsns)) {
10683                 dup = (uint32_t *) gap_descriptor;
10684                 for (i = 0; i < asoc->numduptsns; i++) {
10685                         *dup = htonl(asoc->dup_tsns[i]);
10686                         dup++;
10687                         num_dups++;
10688                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10689                                 /* no more room */
10690                                 break;
10691                         }
10692                 }
10693                 asoc->numduptsns = 0;
10694         }
10695         /*
10696          * now that the chunk is prepared queue it to the control chunk
10697          * queue.
10698          */
10699         if (type == SCTP_SELECTIVE_ACK) {
10700                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10701                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10702                     num_dups * sizeof(int32_t);
10703                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10704                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10705                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10706                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10707                 sack->sack.num_dup_tsns = htons(num_dups);
10708                 sack->ch.chunk_type = type;
10709                 sack->ch.chunk_flags = flags;
10710                 sack->ch.chunk_length = htons(a_chk->send_size);
10711         } else {
10712                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10713                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10714                     num_dups * sizeof(int32_t);
10715                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10716                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10717                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10718                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10719                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10720                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10721                 nr_sack->nr_sack.reserved = 0;
10722                 nr_sack->ch.chunk_type = type;
10723                 nr_sack->ch.chunk_flags = flags;
10724                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10725         }
10726         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10727         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10728         asoc->ctrl_queue_cnt++;
10729         asoc->send_sack = 0;
10730         SCTP_STAT_INCR(sctps_sendsacks);
10731         return;
10732 }
10733
10734 void
10735 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10736 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10737     SCTP_UNUSED
10738 #endif
10739 )
10740 {
10741         struct mbuf *m_abort;
10742         struct mbuf *m_out = NULL, *m_end = NULL;
10743         struct sctp_abort_chunk *abort = NULL;
10744         int sz;
10745         uint32_t auth_offset = 0;
10746         struct sctp_auth_chunk *auth = NULL;
10747         struct sctp_nets *net;
10748
10749         /*-
10750          * Add an AUTH chunk, if chunk requires it and save the offset into
10751          * the chain for AUTH
10752          */
10753         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10754             stcb->asoc.peer_auth_chunks)) {
10755                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10756                     stcb, SCTP_ABORT_ASSOCIATION);
10757                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10758         }
10759         SCTP_TCB_LOCK_ASSERT(stcb);
10760         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10761         if (m_abort == NULL) {
10762                 /* no mbuf's */
10763                 if (m_out)
10764                         sctp_m_freem(m_out);
10765                 return;
10766         }
10767         /* link in any error */
10768         SCTP_BUF_NEXT(m_abort) = operr;
10769         sz = 0;
10770         if (operr) {
10771                 struct mbuf *n;
10772
10773                 n = operr;
10774                 while (n) {
10775                         sz += SCTP_BUF_LEN(n);
10776                         n = SCTP_BUF_NEXT(n);
10777                 }
10778         }
10779         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10780         if (m_out == NULL) {
10781                 /* NO Auth chunk prepended, so reserve space in front */
10782                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10783                 m_out = m_abort;
10784         } else {
10785                 /* Put AUTH chunk at the front of the chain */
10786                 SCTP_BUF_NEXT(m_end) = m_abort;
10787         }
10788         if (stcb->asoc.alternate) {
10789                 net = stcb->asoc.alternate;
10790         } else {
10791                 net = stcb->asoc.primary_destination;
10792         }
10793         /* fill in the ABORT chunk */
10794         abort = mtod(m_abort, struct sctp_abort_chunk *);
10795         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10796         abort->ch.chunk_flags = 0;
10797         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10798
10799         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10800             (struct sockaddr *)&net->ro._l_addr,
10801             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10802             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10803             stcb->asoc.primary_destination->port, NULL,
10804             0, 0,
10805             so_locked);
10806         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10807 }
10808
10809 void
10810 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10811     struct sctp_nets *net,
10812     int reflect_vtag)
10813 {
10814         /* formulate and SEND a SHUTDOWN-COMPLETE */
10815         struct mbuf *m_shutdown_comp;
10816         struct sctp_shutdown_complete_chunk *shutdown_complete;
10817         uint32_t vtag;
10818         uint8_t flags;
10819
10820         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10821         if (m_shutdown_comp == NULL) {
10822                 /* no mbuf's */
10823                 return;
10824         }
10825         if (reflect_vtag) {
10826                 flags = SCTP_HAD_NO_TCB;
10827                 vtag = stcb->asoc.my_vtag;
10828         } else {
10829                 flags = 0;
10830                 vtag = stcb->asoc.peer_vtag;
10831         }
10832         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10833         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10834         shutdown_complete->ch.chunk_flags = flags;
10835         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10836         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10837         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10838             (struct sockaddr *)&net->ro._l_addr,
10839             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10840             stcb->sctp_ep->sctp_lport, stcb->rport,
10841             htonl(vtag),
10842             net->port, NULL,
10843             0, 0,
10844             SCTP_SO_NOT_LOCKED);
10845         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10846         return;
10847 }
10848
10849 static void
10850 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10851     struct sctphdr *sh, uint32_t vtag,
10852     uint8_t type, struct mbuf *cause,
10853     uint8_t use_mflowid, uint32_t mflowid,
10854     uint32_t vrf_id, uint16_t port)
10855 {
10856         struct mbuf *o_pak;
10857         struct mbuf *mout;
10858         struct sctphdr *shout;
10859         struct sctp_chunkhdr *ch;
10860         struct udphdr *udp;
10861         int len, cause_len, padding_len, ret;
10862
10863 #ifdef INET
10864         struct sockaddr_in *src_sin, *dst_sin;
10865         struct ip *ip;
10866
10867 #endif
10868 #ifdef INET6
10869         struct sockaddr_in6 *src_sin6, *dst_sin6;
10870         struct ip6_hdr *ip6;
10871
10872 #endif
10873
10874         /* Compute the length of the cause and add final padding. */
10875         cause_len = 0;
10876         if (cause != NULL) {
10877                 struct mbuf *m_at, *m_last = NULL;
10878
10879                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10880                         if (SCTP_BUF_NEXT(m_at) == NULL)
10881                                 m_last = m_at;
10882                         cause_len += SCTP_BUF_LEN(m_at);
10883                 }
10884                 padding_len = cause_len % 4;
10885                 if (padding_len != 0) {
10886                         padding_len = 4 - padding_len;
10887                 }
10888                 if (padding_len != 0) {
10889                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10890                                 sctp_m_freem(cause);
10891                                 return;
10892                         }
10893                 }
10894         } else {
10895                 padding_len = 0;
10896         }
10897         /* Get an mbuf for the header. */
10898         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10899         switch (dst->sa_family) {
10900 #ifdef INET
10901         case AF_INET:
10902                 len += sizeof(struct ip);
10903                 break;
10904 #endif
10905 #ifdef INET6
10906         case AF_INET6:
10907                 len += sizeof(struct ip6_hdr);
10908                 break;
10909 #endif
10910         default:
10911                 break;
10912         }
10913         if (port) {
10914                 len += sizeof(struct udphdr);
10915         }
10916         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10917         if (mout == NULL) {
10918                 if (cause) {
10919                         sctp_m_freem(cause);
10920                 }
10921                 return;
10922         }
10923         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10924         SCTP_BUF_LEN(mout) = len;
10925         SCTP_BUF_NEXT(mout) = cause;
10926         if (use_mflowid != 0) {
10927                 mout->m_pkthdr.flowid = mflowid;
10928                 mout->m_flags |= M_FLOWID;
10929         }
10930 #ifdef INET
10931         ip = NULL;
10932 #endif
10933 #ifdef INET6
10934         ip6 = NULL;
10935 #endif
10936         switch (dst->sa_family) {
10937 #ifdef INET
10938         case AF_INET:
10939                 src_sin = (struct sockaddr_in *)src;
10940                 dst_sin = (struct sockaddr_in *)dst;
10941                 ip = mtod(mout, struct ip *);
10942                 ip->ip_v = IPVERSION;
10943                 ip->ip_hl = (sizeof(struct ip) >> 2);
10944                 ip->ip_tos = 0;
10945                 ip->ip_id = ip_newid();
10946                 ip->ip_off = 0;
10947                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10948                 if (port) {
10949                         ip->ip_p = IPPROTO_UDP;
10950                 } else {
10951                         ip->ip_p = IPPROTO_SCTP;
10952                 }
10953                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10954                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10955                 ip->ip_sum = 0;
10956                 len = sizeof(struct ip);
10957                 shout = (struct sctphdr *)((caddr_t)ip + len);
10958                 break;
10959 #endif
10960 #ifdef INET6
10961         case AF_INET6:
10962                 src_sin6 = (struct sockaddr_in6 *)src;
10963                 dst_sin6 = (struct sockaddr_in6 *)dst;
10964                 ip6 = mtod(mout, struct ip6_hdr *);
10965                 ip6->ip6_flow = htonl(0x60000000);
10966                 if (V_ip6_auto_flowlabel) {
10967                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10968                 }
10969                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10970                 if (port) {
10971                         ip6->ip6_nxt = IPPROTO_UDP;
10972                 } else {
10973                         ip6->ip6_nxt = IPPROTO_SCTP;
10974                 }
10975                 ip6->ip6_src = dst_sin6->sin6_addr;
10976                 ip6->ip6_dst = src_sin6->sin6_addr;
10977                 len = sizeof(struct ip6_hdr);
10978                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
10979                 break;
10980 #endif
10981         default:
10982                 len = 0;
10983                 shout = mtod(mout, struct sctphdr *);
10984                 break;
10985         }
10986         if (port) {
10987                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10988                         sctp_m_freem(mout);
10989                         return;
10990                 }
10991                 udp = (struct udphdr *)shout;
10992                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10993                 udp->uh_dport = port;
10994                 udp->uh_sum = 0;
10995                 udp->uh_ulen = htons(sizeof(struct udphdr) +
10996                     sizeof(struct sctphdr) +
10997                     sizeof(struct sctp_chunkhdr) +
10998                     cause_len + padding_len);
10999                 len += sizeof(struct udphdr);
11000                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11001         } else {
11002                 udp = NULL;
11003         }
11004         shout->src_port = sh->dest_port;
11005         shout->dest_port = sh->src_port;
11006         shout->checksum = 0;
11007         if (vtag) {
11008                 shout->v_tag = htonl(vtag);
11009         } else {
11010                 shout->v_tag = sh->v_tag;
11011         }
11012         len += sizeof(struct sctphdr);
11013         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11014         ch->chunk_type = type;
11015         if (vtag) {
11016                 ch->chunk_flags = 0;
11017         } else {
11018                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11019         }
11020         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11021         len += sizeof(struct sctp_chunkhdr);
11022         len += cause_len + padding_len;
11023
11024         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11025                 sctp_m_freem(mout);
11026                 return;
11027         }
11028         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11029         switch (dst->sa_family) {
11030 #ifdef INET
11031         case AF_INET:
11032                 if (port) {
11033                         if (V_udp_cksum) {
11034                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11035                         } else {
11036                                 udp->uh_sum = 0;
11037                         }
11038                 }
11039                 ip->ip_len = len;
11040                 if (port) {
11041 #if defined(SCTP_WITH_NO_CSUM)
11042                         SCTP_STAT_INCR(sctps_sendnocrc);
11043 #else
11044                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11045                         SCTP_STAT_INCR(sctps_sendswcrc);
11046 #endif
11047                         if (V_udp_cksum) {
11048                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11049                         }
11050                 } else {
11051 #if defined(SCTP_WITH_NO_CSUM)
11052                         SCTP_STAT_INCR(sctps_sendnocrc);
11053 #else
11054                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11055                         mout->m_pkthdr.csum_data = 0;
11056                         SCTP_STAT_INCR(sctps_sendhwcrc);
11057 #endif
11058                 }
11059 #ifdef SCTP_PACKET_LOGGING
11060                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11061                         sctp_packet_log(o_pak);
11062                 }
11063 #endif
11064                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11065                 break;
11066 #endif
11067 #ifdef INET6
11068         case AF_INET6:
11069                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11070                 if (port) {
11071 #if defined(SCTP_WITH_NO_CSUM)
11072                         SCTP_STAT_INCR(sctps_sendnocrc);
11073 #else
11074                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11075                         SCTP_STAT_INCR(sctps_sendswcrc);
11076 #endif
11077                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11078                                 udp->uh_sum = 0xffff;
11079                         }
11080                 } else {
11081 #if defined(SCTP_WITH_NO_CSUM)
11082                         SCTP_STAT_INCR(sctps_sendnocrc);
11083 #else
11084                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11085                         mout->m_pkthdr.csum_data = 0;
11086                         SCTP_STAT_INCR(sctps_sendhwcrc);
11087 #endif
11088                 }
11089 #ifdef SCTP_PACKET_LOGGING
11090                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11091                         sctp_packet_log(o_pak);
11092                 }
11093 #endif
11094                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11095                 break;
11096 #endif
11097         default:
11098                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11099                     dst->sa_family);
11100                 sctp_m_freem(mout);
11101                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11102                 return;
11103         }
11104         SCTP_STAT_INCR(sctps_sendpackets);
11105         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11106         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11107         return;
11108 }
11109
11110 void
11111 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11112     struct sctphdr *sh,
11113     uint8_t use_mflowid, uint32_t mflowid,
11114     uint32_t vrf_id, uint16_t port)
11115 {
11116         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11117             use_mflowid, mflowid,
11118             vrf_id, port);
11119 }
11120
11121 void
11122 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11123 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11124     SCTP_UNUSED
11125 #endif
11126 )
11127 {
11128         struct sctp_tmit_chunk *chk;
11129         struct sctp_heartbeat_chunk *hb;
11130         struct timeval now;
11131
11132         SCTP_TCB_LOCK_ASSERT(stcb);
11133         if (net == NULL) {
11134                 return;
11135         }
11136         (void)SCTP_GETTIME_TIMEVAL(&now);
11137         switch (net->ro._l_addr.sa.sa_family) {
11138 #ifdef INET
11139         case AF_INET:
11140                 break;
11141 #endif
11142 #ifdef INET6
11143         case AF_INET6:
11144                 break;
11145 #endif
11146         default:
11147                 return;
11148         }
11149         sctp_alloc_a_chunk(stcb, chk);
11150         if (chk == NULL) {
11151                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11152                 return;
11153         }
11154         chk->copy_by_ref = 0;
11155         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11156         chk->rec.chunk_id.can_take_data = 1;
11157         chk->asoc = &stcb->asoc;
11158         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11159
11160         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11161         if (chk->data == NULL) {
11162                 sctp_free_a_chunk(stcb, chk, so_locked);
11163                 return;
11164         }
11165         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11166         SCTP_BUF_LEN(chk->data) = chk->send_size;
11167         chk->sent = SCTP_DATAGRAM_UNSENT;
11168         chk->snd_count = 0;
11169         chk->whoTo = net;
11170         atomic_add_int(&chk->whoTo->ref_count, 1);
11171         /* Now we have a mbuf that we can fill in with the details */
11172         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11173         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11174         /* fill out chunk header */
11175         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11176         hb->ch.chunk_flags = 0;
11177         hb->ch.chunk_length = htons(chk->send_size);
11178         /* Fill out hb parameter */
11179         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11180         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11181         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11182         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11183         /* Did our user request this one, put it in */
11184         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11185         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11186         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11187                 /*
11188                  * we only take from the entropy pool if the address is not
11189                  * confirmed.
11190                  */
11191                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11192                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11193         } else {
11194                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11195                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11196         }
11197         switch (net->ro._l_addr.sa.sa_family) {
11198 #ifdef INET
11199         case AF_INET:
11200                 memcpy(hb->heartbeat.hb_info.address,
11201                     &net->ro._l_addr.sin.sin_addr,
11202                     sizeof(net->ro._l_addr.sin.sin_addr));
11203                 break;
11204 #endif
11205 #ifdef INET6
11206         case AF_INET6:
11207                 memcpy(hb->heartbeat.hb_info.address,
11208                     &net->ro._l_addr.sin6.sin6_addr,
11209                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11210                 break;
11211 #endif
11212         default:
11213                 return;
11214                 break;
11215         }
11216         net->hb_responded = 0;
11217         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11218         stcb->asoc.ctrl_queue_cnt++;
11219         SCTP_STAT_INCR(sctps_sendheartbeat);
11220         return;
11221 }
11222
11223 void
11224 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11225     uint32_t high_tsn)
11226 {
11227         struct sctp_association *asoc;
11228         struct sctp_ecne_chunk *ecne;
11229         struct sctp_tmit_chunk *chk;
11230
11231         if (net == NULL) {
11232                 return;
11233         }
11234         asoc = &stcb->asoc;
11235         SCTP_TCB_LOCK_ASSERT(stcb);
11236         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11237                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11238                         /* found a previous ECN_ECHO update it if needed */
11239                         uint32_t cnt, ctsn;
11240
11241                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11242                         ctsn = ntohl(ecne->tsn);
11243                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11244                                 ecne->tsn = htonl(high_tsn);
11245                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11246                         }
11247                         cnt = ntohl(ecne->num_pkts_since_cwr);
11248                         cnt++;
11249                         ecne->num_pkts_since_cwr = htonl(cnt);
11250                         return;
11251                 }
11252         }
11253         /* nope could not find one to update so we must build one */
11254         sctp_alloc_a_chunk(stcb, chk);
11255         if (chk == NULL) {
11256                 return;
11257         }
11258         chk->copy_by_ref = 0;
11259         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11260         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11261         chk->rec.chunk_id.can_take_data = 0;
11262         chk->asoc = &stcb->asoc;
11263         chk->send_size = sizeof(struct sctp_ecne_chunk);
11264         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11265         if (chk->data == NULL) {
11266                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11267                 return;
11268         }
11269         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11270         SCTP_BUF_LEN(chk->data) = chk->send_size;
11271         chk->sent = SCTP_DATAGRAM_UNSENT;
11272         chk->snd_count = 0;
11273         chk->whoTo = net;
11274         atomic_add_int(&chk->whoTo->ref_count, 1);
11275
11276         stcb->asoc.ecn_echo_cnt_onq++;
11277         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11278         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11279         ecne->ch.chunk_flags = 0;
11280         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11281         ecne->tsn = htonl(high_tsn);
11282         ecne->num_pkts_since_cwr = htonl(1);
11283         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11284         asoc->ctrl_queue_cnt++;
11285 }
11286
11287 void
11288 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11289     struct mbuf *m, int len, int iphlen, int bad_crc)
11290 {
11291         struct sctp_association *asoc;
11292         struct sctp_pktdrop_chunk *drp;
11293         struct sctp_tmit_chunk *chk;
11294         uint8_t *datap;
11295         int was_trunc = 0;
11296         int fullsz = 0;
11297         long spc;
11298         int offset;
11299         struct sctp_chunkhdr *ch, chunk_buf;
11300         unsigned int chk_length;
11301
11302         if (!stcb) {
11303                 return;
11304         }
11305         asoc = &stcb->asoc;
11306         SCTP_TCB_LOCK_ASSERT(stcb);
11307         if (asoc->peer_supports_pktdrop == 0) {
11308                 /*-
11309                  * peer must declare support before I send one.
11310                  */
11311                 return;
11312         }
11313         if (stcb->sctp_socket == NULL) {
11314                 return;
11315         }
11316         sctp_alloc_a_chunk(stcb, chk);
11317         if (chk == NULL) {
11318                 return;
11319         }
11320         chk->copy_by_ref = 0;
11321         len -= iphlen;
11322         chk->send_size = len;
11323         /* Validate that we do not have an ABORT in here. */
11324         offset = iphlen + sizeof(struct sctphdr);
11325         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11326             sizeof(*ch), (uint8_t *) & chunk_buf);
11327         while (ch != NULL) {
11328                 chk_length = ntohs(ch->chunk_length);
11329                 if (chk_length < sizeof(*ch)) {
11330                         /* break to abort land */
11331                         break;
11332                 }
11333                 switch (ch->chunk_type) {
11334                 case SCTP_PACKET_DROPPED:
11335                 case SCTP_ABORT_ASSOCIATION:
11336                 case SCTP_INITIATION_ACK:
11337                         /**
11338                          * We don't respond with an PKT-DROP to an ABORT
11339                          * or PKT-DROP. We also do not respond to an
11340                          * INIT-ACK, because we can't know if the initiation
11341                          * tag is correct or not.
11342                          */
11343                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11344                         return;
11345                 default:
11346                         break;
11347                 }
11348                 offset += SCTP_SIZE32(chk_length);
11349                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11350                     sizeof(*ch), (uint8_t *) & chunk_buf);
11351         }
11352
11353         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11354             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11355                 /*
11356                  * only send 1 mtu worth, trim off the excess on the end.
11357                  */
11358                 fullsz = len;
11359                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11360                 was_trunc = 1;
11361         }
11362         chk->asoc = &stcb->asoc;
11363         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11364         if (chk->data == NULL) {
11365 jump_out:
11366                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11367                 return;
11368         }
11369         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11370         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11371         if (drp == NULL) {
11372                 sctp_m_freem(chk->data);
11373                 chk->data = NULL;
11374                 goto jump_out;
11375         }
11376         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11377             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11378         chk->book_size_scale = 0;
11379         if (was_trunc) {
11380                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11381                 drp->trunc_len = htons(fullsz);
11382                 /*
11383                  * Len is already adjusted to size minus overhead above take
11384                  * out the pkt_drop chunk itself from it.
11385                  */
11386                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11387                 len = chk->send_size;
11388         } else {
11389                 /* no truncation needed */
11390                 drp->ch.chunk_flags = 0;
11391                 drp->trunc_len = htons(0);
11392         }
11393         if (bad_crc) {
11394                 drp->ch.chunk_flags |= SCTP_BADCRC;
11395         }
11396         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11397         SCTP_BUF_LEN(chk->data) = chk->send_size;
11398         chk->sent = SCTP_DATAGRAM_UNSENT;
11399         chk->snd_count = 0;
11400         if (net) {
11401                 /* we should hit here */
11402                 chk->whoTo = net;
11403                 atomic_add_int(&chk->whoTo->ref_count, 1);
11404         } else {
11405                 chk->whoTo = NULL;
11406         }
11407         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11408         chk->rec.chunk_id.can_take_data = 1;
11409         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11410         drp->ch.chunk_length = htons(chk->send_size);
11411         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11412         if (spc < 0) {
11413                 spc = 0;
11414         }
11415         drp->bottle_bw = htonl(spc);
11416         if (asoc->my_rwnd) {
11417                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11418                     asoc->size_on_all_streams +
11419                     asoc->my_rwnd_control_len +
11420                     stcb->sctp_socket->so_rcv.sb_cc);
11421         } else {
11422                 /*-
11423                  * If my rwnd is 0, possibly from mbuf depletion as well as
11424                  * space used, tell the peer there is NO space aka onq == bw
11425                  */
11426                 drp->current_onq = htonl(spc);
11427         }
11428         drp->reserved = 0;
11429         datap = drp->data;
11430         m_copydata(m, iphlen, len, (caddr_t)datap);
11431         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11432         asoc->ctrl_queue_cnt++;
11433 }
11434
11435 void
11436 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11437 {
11438         struct sctp_association *asoc;
11439         struct sctp_cwr_chunk *cwr;
11440         struct sctp_tmit_chunk *chk;
11441
11442         SCTP_TCB_LOCK_ASSERT(stcb);
11443         if (net == NULL) {
11444                 return;
11445         }
11446         asoc = &stcb->asoc;
11447         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11448                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11449                         /*
11450                          * found a previous CWR queued to same destination
11451                          * update it if needed
11452                          */
11453                         uint32_t ctsn;
11454
11455                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11456                         ctsn = ntohl(cwr->tsn);
11457                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11458                                 cwr->tsn = htonl(high_tsn);
11459                         }
11460                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11461                                 /* Make sure override is carried */
11462                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11463                         }
11464                         return;
11465                 }
11466         }
11467         sctp_alloc_a_chunk(stcb, chk);
11468         if (chk == NULL) {
11469                 return;
11470         }
11471         chk->copy_by_ref = 0;
11472         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11473         chk->rec.chunk_id.can_take_data = 1;
11474         chk->asoc = &stcb->asoc;
11475         chk->send_size = sizeof(struct sctp_cwr_chunk);
11476         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11477         if (chk->data == NULL) {
11478                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11479                 return;
11480         }
11481         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11482         SCTP_BUF_LEN(chk->data) = chk->send_size;
11483         chk->sent = SCTP_DATAGRAM_UNSENT;
11484         chk->snd_count = 0;
11485         chk->whoTo = net;
11486         atomic_add_int(&chk->whoTo->ref_count, 1);
11487         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11488         cwr->ch.chunk_type = SCTP_ECN_CWR;
11489         cwr->ch.chunk_flags = override;
11490         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11491         cwr->tsn = htonl(high_tsn);
11492         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11493         asoc->ctrl_queue_cnt++;
11494 }
11495
11496 void
11497 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11498     int number_entries, uint16_t * list,
11499     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11500 {
11501         uint16_t len, old_len, i;
11502         struct sctp_stream_reset_out_request *req_out;
11503         struct sctp_chunkhdr *ch;
11504
11505         ch = mtod(chk->data, struct sctp_chunkhdr *);
11506         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11507
11508         /* get to new offset for the param. */
11509         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11510         /* now how long will this param be? */
11511         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11512         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11513         req_out->ph.param_length = htons(len);
11514         req_out->request_seq = htonl(seq);
11515         req_out->response_seq = htonl(resp_seq);
11516         req_out->send_reset_at_tsn = htonl(last_sent);
11517         if (number_entries) {
11518                 for (i = 0; i < number_entries; i++) {
11519                         req_out->list_of_streams[i] = htons(list[i]);
11520                 }
11521         }
11522         if (SCTP_SIZE32(len) > len) {
11523                 /*-
11524                  * Need to worry about the pad we may end up adding to the
11525                  * end. This is easy since the struct is either aligned to 4
11526                  * bytes or 2 bytes off.
11527                  */
11528                 req_out->list_of_streams[number_entries] = 0;
11529         }
11530         /* now fix the chunk length */
11531         ch->chunk_length = htons(len + old_len);
11532         chk->book_size = len + old_len;
11533         chk->book_size_scale = 0;
11534         chk->send_size = SCTP_SIZE32(chk->book_size);
11535         SCTP_BUF_LEN(chk->data) = chk->send_size;
11536         return;
11537 }
11538
11539 static void
11540 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11541     int number_entries, uint16_t * list,
11542     uint32_t seq)
11543 {
11544         uint16_t len, old_len, i;
11545         struct sctp_stream_reset_in_request *req_in;
11546         struct sctp_chunkhdr *ch;
11547
11548         ch = mtod(chk->data, struct sctp_chunkhdr *);
11549         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11550
11551         /* get to new offset for the param. */
11552         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11553         /* now how long will this param be? */
11554         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11555         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11556         req_in->ph.param_length = htons(len);
11557         req_in->request_seq = htonl(seq);
11558         if (number_entries) {
11559                 for (i = 0; i < number_entries; i++) {
11560                         req_in->list_of_streams[i] = htons(list[i]);
11561                 }
11562         }
11563         if (SCTP_SIZE32(len) > len) {
11564                 /*-
11565                  * Need to worry about the pad we may end up adding to the
11566                  * end. This is easy since the struct is either aligned to 4
11567                  * bytes or 2 bytes off.
11568                  */
11569                 req_in->list_of_streams[number_entries] = 0;
11570         }
11571         /* now fix the chunk length */
11572         ch->chunk_length = htons(len + old_len);
11573         chk->book_size = len + old_len;
11574         chk->book_size_scale = 0;
11575         chk->send_size = SCTP_SIZE32(chk->book_size);
11576         SCTP_BUF_LEN(chk->data) = chk->send_size;
11577         return;
11578 }
11579
11580 static void
11581 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11582     uint32_t seq)
11583 {
11584         uint16_t len, old_len;
11585         struct sctp_stream_reset_tsn_request *req_tsn;
11586         struct sctp_chunkhdr *ch;
11587
11588         ch = mtod(chk->data, struct sctp_chunkhdr *);
11589         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11590
11591         /* get to new offset for the param. */
11592         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11593         /* now how long will this param be? */
11594         len = sizeof(struct sctp_stream_reset_tsn_request);
11595         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11596         req_tsn->ph.param_length = htons(len);
11597         req_tsn->request_seq = htonl(seq);
11598
11599         /* now fix the chunk length */
11600         ch->chunk_length = htons(len + old_len);
11601         chk->send_size = len + old_len;
11602         chk->book_size = SCTP_SIZE32(chk->send_size);
11603         chk->book_size_scale = 0;
11604         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11605         return;
11606 }
11607
11608 void
11609 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11610     uint32_t resp_seq, uint32_t result)
11611 {
11612         uint16_t len, old_len;
11613         struct sctp_stream_reset_response *resp;
11614         struct sctp_chunkhdr *ch;
11615
11616         ch = mtod(chk->data, struct sctp_chunkhdr *);
11617         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11618
11619         /* get to new offset for the param. */
11620         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11621         /* now how long will this param be? */
11622         len = sizeof(struct sctp_stream_reset_response);
11623         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11624         resp->ph.param_length = htons(len);
11625         resp->response_seq = htonl(resp_seq);
11626         resp->result = ntohl(result);
11627
11628         /* now fix the chunk length */
11629         ch->chunk_length = htons(len + old_len);
11630         chk->book_size = len + old_len;
11631         chk->book_size_scale = 0;
11632         chk->send_size = SCTP_SIZE32(chk->book_size);
11633         SCTP_BUF_LEN(chk->data) = chk->send_size;
11634         return;
11635 }
11636
11637 void
11638 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11639     uint32_t resp_seq, uint32_t result,
11640     uint32_t send_una, uint32_t recv_next)
11641 {
11642         uint16_t len, old_len;
11643         struct sctp_stream_reset_response_tsn *resp;
11644         struct sctp_chunkhdr *ch;
11645
11646         ch = mtod(chk->data, struct sctp_chunkhdr *);
11647         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11648
11649         /* get to new offset for the param. */
11650         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11651         /* now how long will this param be? */
11652         len = sizeof(struct sctp_stream_reset_response_tsn);
11653         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11654         resp->ph.param_length = htons(len);
11655         resp->response_seq = htonl(resp_seq);
11656         resp->result = htonl(result);
11657         resp->senders_next_tsn = htonl(send_una);
11658         resp->receivers_next_tsn = htonl(recv_next);
11659
11660         /* now fix the chunk length */
11661         ch->chunk_length = htons(len + old_len);
11662         chk->book_size = len + old_len;
11663         chk->send_size = SCTP_SIZE32(chk->book_size);
11664         chk->book_size_scale = 0;
11665         SCTP_BUF_LEN(chk->data) = chk->send_size;
11666         return;
11667 }
11668
11669 static void
11670 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11671     uint32_t seq,
11672     uint16_t adding)
11673 {
11674         uint16_t len, old_len;
11675         struct sctp_chunkhdr *ch;
11676         struct sctp_stream_reset_add_strm *addstr;
11677
11678         ch = mtod(chk->data, struct sctp_chunkhdr *);
11679         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11680
11681         /* get to new offset for the param. */
11682         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11683         /* now how long will this param be? */
11684         len = sizeof(struct sctp_stream_reset_add_strm);
11685
11686         /* Fill it out. */
11687         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11688         addstr->ph.param_length = htons(len);
11689         addstr->request_seq = htonl(seq);
11690         addstr->number_of_streams = htons(adding);
11691         addstr->reserved = 0;
11692
11693         /* now fix the chunk length */
11694         ch->chunk_length = htons(len + old_len);
11695         chk->send_size = len + old_len;
11696         chk->book_size = SCTP_SIZE32(chk->send_size);
11697         chk->book_size_scale = 0;
11698         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11699         return;
11700 }
11701
11702 static void
11703 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11704     uint32_t seq,
11705     uint16_t adding)
11706 {
11707         uint16_t len, old_len;
11708         struct sctp_chunkhdr *ch;
11709         struct sctp_stream_reset_add_strm *addstr;
11710
11711         ch = mtod(chk->data, struct sctp_chunkhdr *);
11712         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11713
11714         /* get to new offset for the param. */
11715         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11716         /* now how long will this param be? */
11717         len = sizeof(struct sctp_stream_reset_add_strm);
11718         /* Fill it out. */
11719         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11720         addstr->ph.param_length = htons(len);
11721         addstr->request_seq = htonl(seq);
11722         addstr->number_of_streams = htons(adding);
11723         addstr->reserved = 0;
11724
11725         /* now fix the chunk length */
11726         ch->chunk_length = htons(len + old_len);
11727         chk->send_size = len + old_len;
11728         chk->book_size = SCTP_SIZE32(chk->send_size);
11729         chk->book_size_scale = 0;
11730         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11731         return;
11732 }
11733
11734 int
11735 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11736     int number_entries, uint16_t * list,
11737     uint8_t send_out_req,
11738     uint8_t send_in_req,
11739     uint8_t send_tsn_req,
11740     uint8_t add_stream,
11741     uint16_t adding_o,
11742     uint16_t adding_i, uint8_t peer_asked)
11743 {
11744
11745         struct sctp_association *asoc;
11746         struct sctp_tmit_chunk *chk;
11747         struct sctp_chunkhdr *ch;
11748         uint32_t seq;
11749
11750         asoc = &stcb->asoc;
11751         if (asoc->stream_reset_outstanding) {
11752                 /*-
11753                  * Already one pending, must get ACK back to clear the flag.
11754                  */
11755                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11756                 return (EBUSY);
11757         }
11758         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11759             (add_stream == 0)) {
11760                 /* nothing to do */
11761                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11762                 return (EINVAL);
11763         }
11764         if (send_tsn_req && (send_out_req || send_in_req)) {
11765                 /* error, can't do that */
11766                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11767                 return (EINVAL);
11768         }
11769         sctp_alloc_a_chunk(stcb, chk);
11770         if (chk == NULL) {
11771                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11772                 return (ENOMEM);
11773         }
11774         chk->copy_by_ref = 0;
11775         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11776         chk->rec.chunk_id.can_take_data = 0;
11777         chk->asoc = &stcb->asoc;
11778         chk->book_size = sizeof(struct sctp_chunkhdr);
11779         chk->send_size = SCTP_SIZE32(chk->book_size);
11780         chk->book_size_scale = 0;
11781
11782         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11783         if (chk->data == NULL) {
11784                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11785                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11786                 return (ENOMEM);
11787         }
11788         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11789
11790         /* setup chunk parameters */
11791         chk->sent = SCTP_DATAGRAM_UNSENT;
11792         chk->snd_count = 0;
11793         if (stcb->asoc.alternate) {
11794                 chk->whoTo = stcb->asoc.alternate;
11795         } else {
11796                 chk->whoTo = stcb->asoc.primary_destination;
11797         }
11798         atomic_add_int(&chk->whoTo->ref_count, 1);
11799         ch = mtod(chk->data, struct sctp_chunkhdr *);
11800         ch->chunk_type = SCTP_STREAM_RESET;
11801         ch->chunk_flags = 0;
11802         ch->chunk_length = htons(chk->book_size);
11803         SCTP_BUF_LEN(chk->data) = chk->send_size;
11804
11805         seq = stcb->asoc.str_reset_seq_out;
11806         if (send_out_req) {
11807                 sctp_add_stream_reset_out(chk, number_entries, list,
11808                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11809                 asoc->stream_reset_out_is_outstanding = 1;
11810                 seq++;
11811                 asoc->stream_reset_outstanding++;
11812         }
11813         if ((add_stream & 1) &&
11814             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11815                 /* Need to allocate more */
11816                 struct sctp_stream_out *oldstream;
11817                 struct sctp_stream_queue_pending *sp, *nsp;
11818                 int i;
11819
11820                 oldstream = stcb->asoc.strmout;
11821                 /* get some more */
11822                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11823                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11824                     SCTP_M_STRMO);
11825                 if (stcb->asoc.strmout == NULL) {
11826                         uint8_t x;
11827
11828                         stcb->asoc.strmout = oldstream;
11829                         /* Turn off the bit */
11830                         x = add_stream & 0xfe;
11831                         add_stream = x;
11832                         goto skip_stuff;
11833                 }
11834                 /*
11835                  * Ok now we proceed with copying the old out stuff and
11836                  * initializing the new stuff.
11837                  */
11838                 SCTP_TCB_SEND_LOCK(stcb);
11839                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11840                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11841                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11842                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
11843                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
11844                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11845                         stcb->asoc.strmout[i].stream_no = i;
11846                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11847                         /* now anything on those queues? */
11848                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11849                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11850                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11851                         }
11852                         /* Now move assoc pointers too */
11853                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11854                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11855                         }
11856                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11857                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11858                         }
11859                 }
11860                 /* now the new streams */
11861                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11862                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11863                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11864                         stcb->asoc.strmout[i].chunks_on_queues = 0;
11865                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
11866                         stcb->asoc.strmout[i].stream_no = i;
11867                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11868                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11869                 }
11870                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11871                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11872                 SCTP_TCB_SEND_UNLOCK(stcb);
11873         }
11874 skip_stuff:
11875         if ((add_stream & 1) && (adding_o > 0)) {
11876                 asoc->strm_pending_add_size = adding_o;
11877                 asoc->peer_req_out = peer_asked;
11878                 sctp_add_an_out_stream(chk, seq, adding_o);
11879                 seq++;
11880                 asoc->stream_reset_outstanding++;
11881         }
11882         if ((add_stream & 2) && (adding_i > 0)) {
11883                 sctp_add_an_in_stream(chk, seq, adding_i);
11884                 seq++;
11885                 asoc->stream_reset_outstanding++;
11886         }
11887         if (send_in_req) {
11888                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11889                 seq++;
11890                 asoc->stream_reset_outstanding++;
11891         }
11892         if (send_tsn_req) {
11893                 sctp_add_stream_reset_tsn(chk, seq);
11894                 asoc->stream_reset_outstanding++;
11895         }
11896         asoc->str_reset = chk;
11897         /* insert the chunk for sending */
11898         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11899             chk,
11900             sctp_next);
11901         asoc->ctrl_queue_cnt++;
11902         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11903         return (0);
11904 }
11905
11906 void
11907 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11908     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11909     uint8_t use_mflowid, uint32_t mflowid,
11910     uint32_t vrf_id, uint16_t port)
11911 {
11912         /* Don't respond to an ABORT with an ABORT. */
11913         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11914                 if (cause)
11915                         sctp_m_freem(cause);
11916                 return;
11917         }
11918         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11919             use_mflowid, mflowid,
11920             vrf_id, port);
11921         return;
11922 }
11923
11924 void
11925 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11926     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11927     uint8_t use_mflowid, uint32_t mflowid,
11928     uint32_t vrf_id, uint16_t port)
11929 {
11930         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11931             use_mflowid, mflowid,
11932             vrf_id, port);
11933         return;
11934 }
11935
11936 static struct mbuf *
11937 sctp_copy_resume(struct uio *uio,
11938     int max_send_len,
11939     int user_marks_eor,
11940     int *error,
11941     uint32_t * sndout,
11942     struct mbuf **new_tail)
11943 {
11944         struct mbuf *m;
11945
11946         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11947             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11948         if (m == NULL) {
11949                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11950                 *error = ENOMEM;
11951         } else {
11952                 *sndout = m_length(m, NULL);
11953                 *new_tail = m_last(m);
11954         }
11955         return (m);
11956 }
11957
11958 static int
11959 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11960     struct uio *uio,
11961     int resv_upfront)
11962 {
11963         int left;
11964
11965         left = sp->length;
11966         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11967             resv_upfront, 0);
11968         if (sp->data == NULL) {
11969                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11970                 return (ENOMEM);
11971         }
11972         sp->tail_mbuf = m_last(sp->data);
11973         return (0);
11974 }
11975
11976
11977
11978 static struct sctp_stream_queue_pending *
11979 sctp_copy_it_in(struct sctp_tcb *stcb,
11980     struct sctp_association *asoc,
11981     struct sctp_sndrcvinfo *srcv,
11982     struct uio *uio,
11983     struct sctp_nets *net,
11984     int max_send_len,
11985     int user_marks_eor,
11986     int *error)
11987 {
11988         /*-
11989          * This routine must be very careful in its work. Protocol
11990          * processing is up and running so care must be taken to spl...()
11991          * when you need to do something that may effect the stcb/asoc. The
11992          * sb is locked however. When data is copied the protocol processing
11993          * should be enabled since this is a slower operation...
11994          */
11995         struct sctp_stream_queue_pending *sp = NULL;
11996         int resv_in_first;
11997
11998         *error = 0;
11999         /* Now can we send this? */
12000         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12001             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12002             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12003             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12004                 /* got data while shutting down */
12005                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12006                 *error = ECONNRESET;
12007                 goto out_now;
12008         }
12009         sctp_alloc_a_strmoq(stcb, sp);
12010         if (sp == NULL) {
12011                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12012                 *error = ENOMEM;
12013                 goto out_now;
12014         }
12015         sp->act_flags = 0;
12016         sp->sender_all_done = 0;
12017         sp->sinfo_flags = srcv->sinfo_flags;
12018         sp->timetolive = srcv->sinfo_timetolive;
12019         sp->ppid = srcv->sinfo_ppid;
12020         sp->context = srcv->sinfo_context;
12021         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12022
12023         sp->stream = srcv->sinfo_stream;
12024         sp->length = min(uio->uio_resid, max_send_len);
12025         if ((sp->length == (uint32_t) uio->uio_resid) &&
12026             ((user_marks_eor == 0) ||
12027             (srcv->sinfo_flags & SCTP_EOF) ||
12028             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12029                 sp->msg_is_complete = 1;
12030         } else {
12031                 sp->msg_is_complete = 0;
12032         }
12033         sp->sender_all_done = 0;
12034         sp->some_taken = 0;
12035         sp->put_last_out = 0;
12036         resv_in_first = sizeof(struct sctp_data_chunk);
12037         sp->data = sp->tail_mbuf = NULL;
12038         if (sp->length == 0) {
12039                 *error = 0;
12040                 goto skip_copy;
12041         }
12042         if (srcv->sinfo_keynumber_valid) {
12043                 sp->auth_keyid = srcv->sinfo_keynumber;
12044         } else {
12045                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12046         }
12047         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12048                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12049                 sp->holds_key_ref = 1;
12050         }
12051         *error = sctp_copy_one(sp, uio, resv_in_first);
12052 skip_copy:
12053         if (*error) {
12054                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12055                 sp = NULL;
12056         } else {
12057                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12058                         sp->net = net;
12059                         atomic_add_int(&sp->net->ref_count, 1);
12060                 } else {
12061                         sp->net = NULL;
12062                 }
12063                 sctp_set_prsctp_policy(sp);
12064         }
12065 out_now:
12066         return (sp);
12067 }
12068
12069
12070 int
12071 sctp_sosend(struct socket *so,
12072     struct sockaddr *addr,
12073     struct uio *uio,
12074     struct mbuf *top,
12075     struct mbuf *control,
12076     int flags,
12077     struct thread *p
12078 )
12079 {
12080         int error, use_sndinfo = 0;
12081         struct sctp_sndrcvinfo sndrcvninfo;
12082         struct sockaddr *addr_to_use;
12083
12084 #if defined(INET) && defined(INET6)
12085         struct sockaddr_in sin;
12086
12087 #endif
12088
12089         if (control) {
12090                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12091                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12092                     sizeof(sndrcvninfo))) {
12093                         /* got one */
12094                         use_sndinfo = 1;
12095                 }
12096         }
12097         addr_to_use = addr;
12098 #if defined(INET) && defined(INET6)
12099         if ((addr) && (addr->sa_family == AF_INET6)) {
12100                 struct sockaddr_in6 *sin6;
12101
12102                 sin6 = (struct sockaddr_in6 *)addr;
12103                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12104                         in6_sin6_2_sin(&sin, sin6);
12105                         addr_to_use = (struct sockaddr *)&sin;
12106                 }
12107         }
12108 #endif
12109         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12110             control,
12111             flags,
12112             use_sndinfo ? &sndrcvninfo : NULL
12113             ,p
12114             );
12115         return (error);
12116 }
12117
12118
12119 int
12120 sctp_lower_sosend(struct socket *so,
12121     struct sockaddr *addr,
12122     struct uio *uio,
12123     struct mbuf *i_pak,
12124     struct mbuf *control,
12125     int flags,
12126     struct sctp_sndrcvinfo *srcv
12127     ,
12128     struct thread *p
12129 )
12130 {
12131         unsigned int sndlen = 0, max_len;
12132         int error, len;
12133         struct mbuf *top = NULL;
12134         int queue_only = 0, queue_only_for_init = 0;
12135         int free_cnt_applied = 0;
12136         int un_sent;
12137         int now_filled = 0;
12138         unsigned int inqueue_bytes = 0;
12139         struct sctp_block_entry be;
12140         struct sctp_inpcb *inp;
12141         struct sctp_tcb *stcb = NULL;
12142         struct timeval now;
12143         struct sctp_nets *net;
12144         struct sctp_association *asoc;
12145         struct sctp_inpcb *t_inp;
12146         int user_marks_eor;
12147         int create_lock_applied = 0;
12148         int nagle_applies = 0;
12149         int some_on_control = 0;
12150         int got_all_of_the_send = 0;
12151         int hold_tcblock = 0;
12152         int non_blocking = 0;
12153         uint32_t local_add_more, local_soresv = 0;
12154         uint16_t port;
12155         uint16_t sinfo_flags;
12156         sctp_assoc_t sinfo_assoc_id;
12157
12158         error = 0;
12159         net = NULL;
12160         stcb = NULL;
12161         asoc = NULL;
12162
12163         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12164         if (inp == NULL) {
12165                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12166                 error = EINVAL;
12167                 if (i_pak) {
12168                         SCTP_RELEASE_PKT(i_pak);
12169                 }
12170                 return (error);
12171         }
12172         if ((uio == NULL) && (i_pak == NULL)) {
12173                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12174                 return (EINVAL);
12175         }
12176         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12177         atomic_add_int(&inp->total_sends, 1);
12178         if (uio) {
12179                 if (uio->uio_resid < 0) {
12180                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12181                         return (EINVAL);
12182                 }
12183                 sndlen = uio->uio_resid;
12184         } else {
12185                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12186                 sndlen = SCTP_HEADER_LEN(i_pak);
12187         }
12188         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12189             (void *)addr,
12190             sndlen);
12191         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12192             (inp->sctp_socket->so_qlimit)) {
12193                 /* The listener can NOT send */
12194                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12195                 error = ENOTCONN;
12196                 goto out_unlocked;
12197         }
12198         /**
12199          * Pre-screen address, if one is given the sin-len
12200          * must be set correctly!
12201          */
12202         if (addr) {
12203                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12204
12205                 switch (raddr->sa.sa_family) {
12206 #ifdef INET
12207                 case AF_INET:
12208                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12209                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12210                                 error = EINVAL;
12211                                 goto out_unlocked;
12212                         }
12213                         port = raddr->sin.sin_port;
12214                         break;
12215 #endif
12216 #ifdef INET6
12217                 case AF_INET6:
12218                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12219                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12220                                 error = EINVAL;
12221                                 goto out_unlocked;
12222                         }
12223                         port = raddr->sin6.sin6_port;
12224                         break;
12225 #endif
12226                 default:
12227                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12228                         error = EAFNOSUPPORT;
12229                         goto out_unlocked;
12230                 }
12231         } else
12232                 port = 0;
12233
12234         if (srcv) {
12235                 sinfo_flags = srcv->sinfo_flags;
12236                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12237                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12238                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12239                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12240                         error = EINVAL;
12241                         goto out_unlocked;
12242                 }
12243                 if (srcv->sinfo_flags)
12244                         SCTP_STAT_INCR(sctps_sends_with_flags);
12245         } else {
12246                 sinfo_flags = inp->def_send.sinfo_flags;
12247                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12248         }
12249         if (sinfo_flags & SCTP_SENDALL) {
12250                 /* its a sendall */
12251                 error = sctp_sendall(inp, uio, top, srcv);
12252                 top = NULL;
12253                 goto out_unlocked;
12254         }
12255         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12256                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12257                 error = EINVAL;
12258                 goto out_unlocked;
12259         }
12260         /* now we must find the assoc */
12261         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12262             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12263                 SCTP_INP_RLOCK(inp);
12264                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12265                 if (stcb) {
12266                         SCTP_TCB_LOCK(stcb);
12267                         hold_tcblock = 1;
12268                 }
12269                 SCTP_INP_RUNLOCK(inp);
12270         } else if (sinfo_assoc_id) {
12271                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12272         } else if (addr) {
12273                 /*-
12274                  * Since we did not use findep we must
12275                  * increment it, and if we don't find a tcb
12276                  * decrement it.
12277                  */
12278                 SCTP_INP_WLOCK(inp);
12279                 SCTP_INP_INCR_REF(inp);
12280                 SCTP_INP_WUNLOCK(inp);
12281                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12282                 if (stcb == NULL) {
12283                         SCTP_INP_WLOCK(inp);
12284                         SCTP_INP_DECR_REF(inp);
12285                         SCTP_INP_WUNLOCK(inp);
12286                 } else {
12287                         hold_tcblock = 1;
12288                 }
12289         }
12290         if ((stcb == NULL) && (addr)) {
12291                 /* Possible implicit send? */
12292                 SCTP_ASOC_CREATE_LOCK(inp);
12293                 create_lock_applied = 1;
12294                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12295                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12296                         /* Should I really unlock ? */
12297                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12298                         error = EINVAL;
12299                         goto out_unlocked;
12300
12301                 }
12302                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12303                     (addr->sa_family == AF_INET6)) {
12304                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12305                         error = EINVAL;
12306                         goto out_unlocked;
12307                 }
12308                 SCTP_INP_WLOCK(inp);
12309                 SCTP_INP_INCR_REF(inp);
12310                 SCTP_INP_WUNLOCK(inp);
12311                 /* With the lock applied look again */
12312                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12313                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12314                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12315                 }
12316                 if (stcb == NULL) {
12317                         SCTP_INP_WLOCK(inp);
12318                         SCTP_INP_DECR_REF(inp);
12319                         SCTP_INP_WUNLOCK(inp);
12320                 } else {
12321                         hold_tcblock = 1;
12322                 }
12323                 if (error) {
12324                         goto out_unlocked;
12325                 }
12326                 if (t_inp != inp) {
12327                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12328                         error = ENOTCONN;
12329                         goto out_unlocked;
12330                 }
12331         }
12332         if (stcb == NULL) {
12333                 if (addr == NULL) {
12334                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12335                         error = ENOENT;
12336                         goto out_unlocked;
12337                 } else {
12338                         /* We must go ahead and start the INIT process */
12339                         uint32_t vrf_id;
12340
12341                         if ((sinfo_flags & SCTP_ABORT) ||
12342                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12343                                 /*-
12344                                  * User asks to abort a non-existant assoc,
12345                                  * or EOF a non-existant assoc with no data
12346                                  */
12347                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12348                                 error = ENOENT;
12349                                 goto out_unlocked;
12350                         }
12351                         /* get an asoc/stcb struct */
12352                         vrf_id = inp->def_vrf_id;
12353 #ifdef INVARIANTS
12354                         if (create_lock_applied == 0) {
12355                                 panic("Error, should hold create lock and I don't?");
12356                         }
12357 #endif
12358                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12359                             p
12360                             );
12361                         if (stcb == NULL) {
12362                                 /* Error is setup for us in the call */
12363                                 goto out_unlocked;
12364                         }
12365                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12366                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12367                                 /*
12368                                  * Set the connected flag so we can queue
12369                                  * data
12370                                  */
12371                                 soisconnecting(so);
12372                         }
12373                         hold_tcblock = 1;
12374                         if (create_lock_applied) {
12375                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12376                                 create_lock_applied = 0;
12377                         } else {
12378                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12379                         }
12380                         /*
12381                          * Turn on queue only flag to prevent data from
12382                          * being sent
12383                          */
12384                         queue_only = 1;
12385                         asoc = &stcb->asoc;
12386                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12387                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12388
12389                         /* initialize authentication params for the assoc */
12390                         sctp_initialize_auth_params(inp, stcb);
12391
12392                         if (control) {
12393                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12394                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12395                                         hold_tcblock = 0;
12396                                         stcb = NULL;
12397                                         goto out_unlocked;
12398                                 }
12399                         }
12400                         /* out with the INIT */
12401                         queue_only_for_init = 1;
12402                         /*-
12403                          * we may want to dig in after this call and adjust the MTU
12404                          * value. It defaulted to 1500 (constant) but the ro
12405                          * structure may now have an update and thus we may need to
12406                          * change it BEFORE we append the message.
12407                          */
12408                 }
12409         } else
12410                 asoc = &stcb->asoc;
12411         if (srcv == NULL)
12412                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12413         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12414                 if (addr)
12415                         net = sctp_findnet(stcb, addr);
12416                 else
12417                         net = NULL;
12418                 if ((net == NULL) ||
12419                     ((port != 0) && (port != stcb->rport))) {
12420                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12421                         error = EINVAL;
12422                         goto out_unlocked;
12423                 }
12424         } else {
12425                 if (stcb->asoc.alternate) {
12426                         net = stcb->asoc.alternate;
12427                 } else {
12428                         net = stcb->asoc.primary_destination;
12429                 }
12430         }
12431         atomic_add_int(&stcb->total_sends, 1);
12432         /* Keep the stcb from being freed under our feet */
12433         atomic_add_int(&asoc->refcnt, 1);
12434         free_cnt_applied = 1;
12435
12436         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12437                 if (sndlen > asoc->smallest_mtu) {
12438                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12439                         error = EMSGSIZE;
12440                         goto out_unlocked;
12441                 }
12442         }
12443         if (SCTP_SO_IS_NBIO(so)
12444             || (flags & MSG_NBIO)
12445             ) {
12446                 non_blocking = 1;
12447         }
12448         /* would we block? */
12449         if (non_blocking) {
12450                 if (hold_tcblock == 0) {
12451                         SCTP_TCB_LOCK(stcb);
12452                         hold_tcblock = 1;
12453                 }
12454                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12455                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12456                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12457                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12458                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12459                                 error = EMSGSIZE;
12460                         else
12461                                 error = EWOULDBLOCK;
12462                         goto out_unlocked;
12463                 }
12464                 stcb->asoc.sb_send_resv += sndlen;
12465                 SCTP_TCB_UNLOCK(stcb);
12466                 hold_tcblock = 0;
12467         } else {
12468                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12469         }
12470         local_soresv = sndlen;
12471         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12472                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12473                 error = ECONNRESET;
12474                 goto out_unlocked;
12475         }
12476         if (create_lock_applied) {
12477                 SCTP_ASOC_CREATE_UNLOCK(inp);
12478                 create_lock_applied = 0;
12479         }
12480         if (asoc->stream_reset_outstanding) {
12481                 /*
12482                  * Can't queue any data while stream reset is underway.
12483                  */
12484                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12485                 error = EAGAIN;
12486                 goto out_unlocked;
12487         }
12488         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12489             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12490                 queue_only = 1;
12491         }
12492         /* we are now done with all control */
12493         if (control) {
12494                 sctp_m_freem(control);
12495                 control = NULL;
12496         }
12497         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12498             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12499             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12500             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12501                 if (srcv->sinfo_flags & SCTP_ABORT) {
12502                         ;
12503                 } else {
12504                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12505                         error = ECONNRESET;
12506                         goto out_unlocked;
12507                 }
12508         }
12509         /* Ok, we will attempt a msgsnd :> */
12510         if (p) {
12511                 p->td_ru.ru_msgsnd++;
12512         }
12513         /* Are we aborting? */
12514         if (srcv->sinfo_flags & SCTP_ABORT) {
12515                 struct mbuf *mm;
12516                 int tot_demand, tot_out = 0, max_out;
12517
12518                 SCTP_STAT_INCR(sctps_sends_with_abort);
12519                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12520                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12521                         /* It has to be up before we abort */
12522                         /* how big is the user initiated abort? */
12523                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12524                         error = EINVAL;
12525                         goto out;
12526                 }
12527                 if (hold_tcblock) {
12528                         SCTP_TCB_UNLOCK(stcb);
12529                         hold_tcblock = 0;
12530                 }
12531                 if (top) {
12532                         struct mbuf *cntm = NULL;
12533
12534                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12535                         if (sndlen != 0) {
12536                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12537                                         tot_out += SCTP_BUF_LEN(cntm);
12538                                 }
12539                         }
12540                 } else {
12541                         /* Must fit in a MTU */
12542                         tot_out = sndlen;
12543                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12544                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12545                                 /* To big */
12546                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12547                                 error = EMSGSIZE;
12548                                 goto out;
12549                         }
12550                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12551                 }
12552                 if (mm == NULL) {
12553                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12554                         error = ENOMEM;
12555                         goto out;
12556                 }
12557                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12558                 max_out -= sizeof(struct sctp_abort_msg);
12559                 if (tot_out > max_out) {
12560                         tot_out = max_out;
12561                 }
12562                 if (mm) {
12563                         struct sctp_paramhdr *ph;
12564
12565                         /* now move forward the data pointer */
12566                         ph = mtod(mm, struct sctp_paramhdr *);
12567                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12568                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12569                         ph++;
12570                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12571                         if (top == NULL) {
12572                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12573                                 if (error) {
12574                                         /*-
12575                                          * Here if we can't get his data we
12576                                          * still abort we just don't get to
12577                                          * send the users note :-0
12578                                          */
12579                                         sctp_m_freem(mm);
12580                                         mm = NULL;
12581                                 }
12582                         } else {
12583                                 if (sndlen != 0) {
12584                                         SCTP_BUF_NEXT(mm) = top;
12585                                 }
12586                         }
12587                 }
12588                 if (hold_tcblock == 0) {
12589                         SCTP_TCB_LOCK(stcb);
12590                 }
12591                 atomic_add_int(&stcb->asoc.refcnt, -1);
12592                 free_cnt_applied = 0;
12593                 /* release this lock, otherwise we hang on ourselves */
12594                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12595                 /* now relock the stcb so everything is sane */
12596                 hold_tcblock = 0;
12597                 stcb = NULL;
12598                 /*
12599                  * In this case top is already chained to mm avoid double
12600                  * free, since we free it below if top != NULL and driver
12601                  * would free it after sending the packet out
12602                  */
12603                 if (sndlen != 0) {
12604                         top = NULL;
12605                 }
12606                 goto out_unlocked;
12607         }
12608         /* Calculate the maximum we can send */
12609         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12610         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12611                 if (non_blocking) {
12612                         /* we already checked for non-blocking above. */
12613                         max_len = sndlen;
12614                 } else {
12615                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12616                 }
12617         } else {
12618                 max_len = 0;
12619         }
12620         if (hold_tcblock) {
12621                 SCTP_TCB_UNLOCK(stcb);
12622                 hold_tcblock = 0;
12623         }
12624         /* Is the stream no. valid? */
12625         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12626                 /* Invalid stream number */
12627                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12628                 error = EINVAL;
12629                 goto out_unlocked;
12630         }
12631         if (asoc->strmout == NULL) {
12632                 /* huh? software error */
12633                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12634                 error = EFAULT;
12635                 goto out_unlocked;
12636         }
12637         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12638         if ((user_marks_eor == 0) &&
12639             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12640                 /* It will NEVER fit */
12641                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12642                 error = EMSGSIZE;
12643                 goto out_unlocked;
12644         }
12645         if ((uio == NULL) && user_marks_eor) {
12646                 /*-
12647                  * We do not support eeor mode for
12648                  * sending with mbuf chains (like sendfile).
12649                  */
12650                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12651                 error = EINVAL;
12652                 goto out_unlocked;
12653         }
12654         if (user_marks_eor) {
12655                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12656         } else {
12657                 /*-
12658                  * For non-eeor the whole message must fit in
12659                  * the socket send buffer.
12660                  */
12661                 local_add_more = sndlen;
12662         }
12663         len = 0;
12664         if (non_blocking) {
12665                 goto skip_preblock;
12666         }
12667         if (((max_len <= local_add_more) &&
12668             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12669             (max_len == 0) ||
12670             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12671                 /* No room right now ! */
12672                 SOCKBUF_LOCK(&so->so_snd);
12673                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12674                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12675                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12676                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12677                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12678                             inqueue_bytes,
12679                             local_add_more,
12680                             stcb->asoc.stream_queue_cnt,
12681                             stcb->asoc.chunks_on_out_queue,
12682                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12683                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12684                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12685                         }
12686                         be.error = 0;
12687                         stcb->block_entry = &be;
12688                         error = sbwait(&so->so_snd);
12689                         stcb->block_entry = NULL;
12690                         if (error || so->so_error || be.error) {
12691                                 if (error == 0) {
12692                                         if (so->so_error)
12693                                                 error = so->so_error;
12694                                         if (be.error) {
12695                                                 error = be.error;
12696                                         }
12697                                 }
12698                                 SOCKBUF_UNLOCK(&so->so_snd);
12699                                 goto out_unlocked;
12700                         }
12701                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12702                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12703                                     asoc, stcb->asoc.total_output_queue_size);
12704                         }
12705                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12706                                 goto out_unlocked;
12707                         }
12708                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12709                 }
12710                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12711                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12712                 } else {
12713                         max_len = 0;
12714                 }
12715                 SOCKBUF_UNLOCK(&so->so_snd);
12716         }
12717 skip_preblock:
12718         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12719                 goto out_unlocked;
12720         }
12721         /*
12722          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12723          * case NOTE: uio will be null when top/mbuf is passed
12724          */
12725         if (sndlen == 0) {
12726                 if (srcv->sinfo_flags & SCTP_EOF) {
12727                         got_all_of_the_send = 1;
12728                         goto dataless_eof;
12729                 } else {
12730                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12731                         error = EINVAL;
12732                         goto out;
12733                 }
12734         }
12735         if (top == NULL) {
12736                 struct sctp_stream_queue_pending *sp;
12737                 struct sctp_stream_out *strm;
12738                 uint32_t sndout;
12739
12740                 SCTP_TCB_SEND_LOCK(stcb);
12741                 if ((asoc->stream_locked) &&
12742                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12743                         SCTP_TCB_SEND_UNLOCK(stcb);
12744                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12745                         error = EINVAL;
12746                         goto out;
12747                 }
12748                 SCTP_TCB_SEND_UNLOCK(stcb);
12749
12750                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12751                 if (strm->last_msg_incomplete == 0) {
12752         do_a_copy_in:
12753                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12754                         if ((sp == NULL) || (error)) {
12755                                 goto out;
12756                         }
12757                         SCTP_TCB_SEND_LOCK(stcb);
12758                         if (sp->msg_is_complete) {
12759                                 strm->last_msg_incomplete = 0;
12760                                 asoc->stream_locked = 0;
12761                         } else {
12762                                 /*
12763                                  * Just got locked to this guy in case of an
12764                                  * interrupt.
12765                                  */
12766                                 strm->last_msg_incomplete = 1;
12767                                 asoc->stream_locked = 1;
12768                                 asoc->stream_locked_on = srcv->sinfo_stream;
12769                                 sp->sender_all_done = 0;
12770                         }
12771                         sctp_snd_sb_alloc(stcb, sp->length);
12772                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12773                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
12774                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12775                         }
12776                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12777                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12778                         SCTP_TCB_SEND_UNLOCK(stcb);
12779                 } else {
12780                         SCTP_TCB_SEND_LOCK(stcb);
12781                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12782                         SCTP_TCB_SEND_UNLOCK(stcb);
12783                         if (sp == NULL) {
12784                                 /* ???? Huh ??? last msg is gone */
12785 #ifdef INVARIANTS
12786                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12787 #else
12788                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12789                                 strm->last_msg_incomplete = 0;
12790 #endif
12791                                 goto do_a_copy_in;
12792
12793                         }
12794                 }
12795                 while (uio->uio_resid > 0) {
12796                         /* How much room do we have? */
12797                         struct mbuf *new_tail, *mm;
12798
12799                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12800                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12801                         else
12802                                 max_len = 0;
12803
12804                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12805                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12806                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12807                                 sndout = 0;
12808                                 new_tail = NULL;
12809                                 if (hold_tcblock) {
12810                                         SCTP_TCB_UNLOCK(stcb);
12811                                         hold_tcblock = 0;
12812                                 }
12813                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12814                                 if ((mm == NULL) || error) {
12815                                         if (mm) {
12816                                                 sctp_m_freem(mm);
12817                                         }
12818                                         goto out;
12819                                 }
12820                                 /* Update the mbuf and count */
12821                                 SCTP_TCB_SEND_LOCK(stcb);
12822                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12823                                         /*
12824                                          * we need to get out. Peer probably
12825                                          * aborted.
12826                                          */
12827                                         sctp_m_freem(mm);
12828                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12829                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12830                                                 error = ECONNRESET;
12831                                         }
12832                                         SCTP_TCB_SEND_UNLOCK(stcb);
12833                                         goto out;
12834                                 }
12835                                 if (sp->tail_mbuf) {
12836                                         /* tack it to the end */
12837                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12838                                         sp->tail_mbuf = new_tail;
12839                                 } else {
12840                                         /* A stolen mbuf */
12841                                         sp->data = mm;
12842                                         sp->tail_mbuf = new_tail;
12843                                 }
12844                                 sctp_snd_sb_alloc(stcb, sndout);
12845                                 atomic_add_int(&sp->length, sndout);
12846                                 len += sndout;
12847
12848                                 /* Did we reach EOR? */
12849                                 if ((uio->uio_resid == 0) &&
12850                                     ((user_marks_eor == 0) ||
12851                                     (srcv->sinfo_flags & SCTP_EOF) ||
12852                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12853                                         sp->msg_is_complete = 1;
12854                                 } else {
12855                                         sp->msg_is_complete = 0;
12856                                 }
12857                                 SCTP_TCB_SEND_UNLOCK(stcb);
12858                         }
12859                         if (uio->uio_resid == 0) {
12860                                 /* got it all? */
12861                                 continue;
12862                         }
12863                         /* PR-SCTP? */
12864                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12865                                 /*
12866                                  * This is ugly but we must assure locking
12867                                  * order
12868                                  */
12869                                 if (hold_tcblock == 0) {
12870                                         SCTP_TCB_LOCK(stcb);
12871                                         hold_tcblock = 1;
12872                                 }
12873                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12874                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12875                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12876                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12877                                 else
12878                                         max_len = 0;
12879                                 if (max_len > 0) {
12880                                         continue;
12881                                 }
12882                                 SCTP_TCB_UNLOCK(stcb);
12883                                 hold_tcblock = 0;
12884                         }
12885                         /* wait for space now */
12886                         if (non_blocking) {
12887                                 /* Non-blocking io in place out */
12888                                 goto skip_out_eof;
12889                         }
12890                         /* What about the INIT, send it maybe */
12891                         if (queue_only_for_init) {
12892                                 if (hold_tcblock == 0) {
12893                                         SCTP_TCB_LOCK(stcb);
12894                                         hold_tcblock = 1;
12895                                 }
12896                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12897                                         /* a collision took us forward? */
12898                                         queue_only = 0;
12899                                 } else {
12900                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12901                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12902                                         queue_only = 1;
12903                                 }
12904                         }
12905                         if ((net->flight_size > net->cwnd) &&
12906                             (asoc->sctp_cmt_on_off == 0)) {
12907                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12908                                 queue_only = 1;
12909                         } else if (asoc->ifp_had_enobuf) {
12910                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12911                                 if (net->flight_size > (2 * net->mtu)) {
12912                                         queue_only = 1;
12913                                 }
12914                                 asoc->ifp_had_enobuf = 0;
12915                         }
12916                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12917                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12918                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12919                             (stcb->asoc.total_flight > 0) &&
12920                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12921                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12922
12923                                 /*-
12924                                  * Ok, Nagle is set on and we have data outstanding.
12925                                  * Don't send anything and let SACKs drive out the
12926                                  * data unless wen have a "full" segment to send.
12927                                  */
12928                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12929                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12930                                 }
12931                                 SCTP_STAT_INCR(sctps_naglequeued);
12932                                 nagle_applies = 1;
12933                         } else {
12934                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12935                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12936                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12937                                 }
12938                                 SCTP_STAT_INCR(sctps_naglesent);
12939                                 nagle_applies = 0;
12940                         }
12941                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12942
12943                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12944                                     nagle_applies, un_sent);
12945                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12946                                     stcb->asoc.total_flight,
12947                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12948                         }
12949                         if (queue_only_for_init)
12950                                 queue_only_for_init = 0;
12951                         if ((queue_only == 0) && (nagle_applies == 0)) {
12952                                 /*-
12953                                  * need to start chunk output
12954                                  * before blocking.. note that if
12955                                  * a lock is already applied, then
12956                                  * the input via the net is happening
12957                                  * and I don't need to start output :-D
12958                                  */
12959                                 if (hold_tcblock == 0) {
12960                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12961                                                 hold_tcblock = 1;
12962                                                 sctp_chunk_output(inp,
12963                                                     stcb,
12964                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12965                                         }
12966                                 } else {
12967                                         sctp_chunk_output(inp,
12968                                             stcb,
12969                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12970                                 }
12971                                 if (hold_tcblock == 1) {
12972                                         SCTP_TCB_UNLOCK(stcb);
12973                                         hold_tcblock = 0;
12974                                 }
12975                         }
12976                         SOCKBUF_LOCK(&so->so_snd);
12977                         /*-
12978                          * This is a bit strange, but I think it will
12979                          * work. The total_output_queue_size is locked and
12980                          * protected by the TCB_LOCK, which we just released.
12981                          * There is a race that can occur between releasing it
12982                          * above, and me getting the socket lock, where sacks
12983                          * come in but we have not put the SB_WAIT on the
12984                          * so_snd buffer to get the wakeup. After the LOCK
12985                          * is applied the sack_processing will also need to
12986                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12987                          * once we have the socket buffer lock if we recheck the
12988                          * size we KNOW we will get to sleep safely with the
12989                          * wakeup flag in place.
12990                          */
12991                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12992                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
12993                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12994                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12995                                             asoc, uio->uio_resid);
12996                                 }
12997                                 be.error = 0;
12998                                 stcb->block_entry = &be;
12999                                 error = sbwait(&so->so_snd);
13000                                 stcb->block_entry = NULL;
13001
13002                                 if (error || so->so_error || be.error) {
13003                                         if (error == 0) {
13004                                                 if (so->so_error)
13005                                                         error = so->so_error;
13006                                                 if (be.error) {
13007                                                         error = be.error;
13008                                                 }
13009                                         }
13010                                         SOCKBUF_UNLOCK(&so->so_snd);
13011                                         goto out_unlocked;
13012                                 }
13013                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13014                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13015                                             asoc, stcb->asoc.total_output_queue_size);
13016                                 }
13017                         }
13018                         SOCKBUF_UNLOCK(&so->so_snd);
13019                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13020                                 goto out_unlocked;
13021                         }
13022                 }
13023                 SCTP_TCB_SEND_LOCK(stcb);
13024                 if (sp) {
13025                         if (sp->msg_is_complete == 0) {
13026                                 strm->last_msg_incomplete = 1;
13027                                 asoc->stream_locked = 1;
13028                                 asoc->stream_locked_on = srcv->sinfo_stream;
13029                         } else {
13030                                 sp->sender_all_done = 1;
13031                                 strm->last_msg_incomplete = 0;
13032                                 asoc->stream_locked = 0;
13033                         }
13034                 } else {
13035                         SCTP_PRINTF("Huh no sp TSNH?\n");
13036                         strm->last_msg_incomplete = 0;
13037                         asoc->stream_locked = 0;
13038                 }
13039                 SCTP_TCB_SEND_UNLOCK(stcb);
13040                 if (uio->uio_resid == 0) {
13041                         got_all_of_the_send = 1;
13042                 }
13043         } else {
13044                 /* We send in a 0, since we do NOT have any locks */
13045                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13046                 top = NULL;
13047                 if (srcv->sinfo_flags & SCTP_EOF) {
13048                         /*
13049                          * This should only happen for Panda for the mbuf
13050                          * send case, which does NOT yet support EEOR mode.
13051                          * Thus, we can just set this flag to do the proper
13052                          * EOF handling.
13053                          */
13054                         got_all_of_the_send = 1;
13055                 }
13056         }
13057         if (error) {
13058                 goto out;
13059         }
13060 dataless_eof:
13061         /* EOF thing ? */
13062         if ((srcv->sinfo_flags & SCTP_EOF) &&
13063             (got_all_of_the_send == 1)) {
13064                 int cnt;
13065
13066                 SCTP_STAT_INCR(sctps_sends_with_eof);
13067                 error = 0;
13068                 if (hold_tcblock == 0) {
13069                         SCTP_TCB_LOCK(stcb);
13070                         hold_tcblock = 1;
13071                 }
13072                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13073                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13074                     TAILQ_EMPTY(&asoc->sent_queue) &&
13075                     (cnt == 0)) {
13076                         if (asoc->locked_on_sending) {
13077                                 goto abort_anyway;
13078                         }
13079                         /* there is nothing queued to send, so I'm done... */
13080                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13081                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13082                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13083                                 struct sctp_nets *netp;
13084
13085                                 if (stcb->asoc.alternate) {
13086                                         netp = stcb->asoc.alternate;
13087                                 } else {
13088                                         netp = stcb->asoc.primary_destination;
13089                                 }
13090                                 /* only send SHUTDOWN the first time through */
13091                                 sctp_send_shutdown(stcb, netp);
13092                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13093                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13094                                 }
13095                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13096                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13097                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13098                                     netp);
13099                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13100                                     asoc->primary_destination);
13101                         }
13102                 } else {
13103                         /*-
13104                          * we still got (or just got) data to send, so set
13105                          * SHUTDOWN_PENDING
13106                          */
13107                         /*-
13108                          * XXX sockets draft says that SCTP_EOF should be
13109                          * sent with no data.  currently, we will allow user
13110                          * data to be sent first and move to
13111                          * SHUTDOWN-PENDING
13112                          */
13113                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13114                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13115                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13116                                 if (hold_tcblock == 0) {
13117                                         SCTP_TCB_LOCK(stcb);
13118                                         hold_tcblock = 1;
13119                                 }
13120                                 if (asoc->locked_on_sending) {
13121                                         /* Locked to send out the data */
13122                                         struct sctp_stream_queue_pending *sp;
13123
13124                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13125                                         if (sp) {
13126                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13127                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13128                                         }
13129                                 }
13130                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13131                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13132                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13133                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13134                         abort_anyway:
13135                                         if (free_cnt_applied) {
13136                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13137                                                 free_cnt_applied = 0;
13138                                         }
13139                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13140                                             NULL, SCTP_SO_LOCKED);
13141                                         /*
13142                                          * now relock the stcb so everything
13143                                          * is sane
13144                                          */
13145                                         hold_tcblock = 0;
13146                                         stcb = NULL;
13147                                         goto out;
13148                                 }
13149                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13150                                     asoc->primary_destination);
13151                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13152                         }
13153                 }
13154         }
13155 skip_out_eof:
13156         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13157                 some_on_control = 1;
13158         }
13159         if (queue_only_for_init) {
13160                 if (hold_tcblock == 0) {
13161                         SCTP_TCB_LOCK(stcb);
13162                         hold_tcblock = 1;
13163                 }
13164                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13165                         /* a collision took us forward? */
13166                         queue_only = 0;
13167                 } else {
13168                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13169                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13170                         queue_only = 1;
13171                 }
13172         }
13173         if ((net->flight_size > net->cwnd) &&
13174             (stcb->asoc.sctp_cmt_on_off == 0)) {
13175                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13176                 queue_only = 1;
13177         } else if (asoc->ifp_had_enobuf) {
13178                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13179                 if (net->flight_size > (2 * net->mtu)) {
13180                         queue_only = 1;
13181                 }
13182                 asoc->ifp_had_enobuf = 0;
13183         }
13184         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13185             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13186         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13187             (stcb->asoc.total_flight > 0) &&
13188             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13189             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13190                 /*-
13191                  * Ok, Nagle is set on and we have data outstanding.
13192                  * Don't send anything and let SACKs drive out the
13193                  * data unless wen have a "full" segment to send.
13194                  */
13195                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13196                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13197                 }
13198                 SCTP_STAT_INCR(sctps_naglequeued);
13199                 nagle_applies = 1;
13200         } else {
13201                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13202                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13203                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13204                 }
13205                 SCTP_STAT_INCR(sctps_naglesent);
13206                 nagle_applies = 0;
13207         }
13208         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13209                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13210                     nagle_applies, un_sent);
13211                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13212                     stcb->asoc.total_flight,
13213                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13214         }
13215         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13216                 /* we can attempt to send too. */
13217                 if (hold_tcblock == 0) {
13218                         /*
13219                          * If there is activity recv'ing sacks no need to
13220                          * send
13221                          */
13222                         if (SCTP_TCB_TRYLOCK(stcb)) {
13223                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13224                                 hold_tcblock = 1;
13225                         }
13226                 } else {
13227                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13228                 }
13229         } else if ((queue_only == 0) &&
13230                     (stcb->asoc.peers_rwnd == 0) &&
13231             (stcb->asoc.total_flight == 0)) {
13232                 /* We get to have a probe outstanding */
13233                 if (hold_tcblock == 0) {
13234                         hold_tcblock = 1;
13235                         SCTP_TCB_LOCK(stcb);
13236                 }
13237                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13238         } else if (some_on_control) {
13239                 int num_out, reason, frag_point;
13240
13241                 /* Here we do control only */
13242                 if (hold_tcblock == 0) {
13243                         hold_tcblock = 1;
13244                         SCTP_TCB_LOCK(stcb);
13245                 }
13246                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13247                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13248                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13249         }
13250         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13251             queue_only, stcb->asoc.peers_rwnd, un_sent,
13252             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13253             stcb->asoc.total_output_queue_size, error);
13254
13255 out:
13256 out_unlocked:
13257
13258         if (local_soresv && stcb) {
13259                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13260         }
13261         if (create_lock_applied) {
13262                 SCTP_ASOC_CREATE_UNLOCK(inp);
13263         }
13264         if ((stcb) && hold_tcblock) {
13265                 SCTP_TCB_UNLOCK(stcb);
13266         }
13267         if (stcb && free_cnt_applied) {
13268                 atomic_add_int(&stcb->asoc.refcnt, -1);
13269         }
13270 #ifdef INVARIANTS
13271         if (stcb) {
13272                 if (mtx_owned(&stcb->tcb_mtx)) {
13273                         panic("Leaving with tcb mtx owned?");
13274                 }
13275                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13276                         panic("Leaving with tcb send mtx owned?");
13277                 }
13278         }
13279 #endif
13280 #ifdef INVARIANTS
13281         if (inp) {
13282                 sctp_validate_no_locks(inp);
13283         } else {
13284                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13285         }
13286 #endif
13287         if (top) {
13288                 sctp_m_freem(top);
13289         }
13290         if (control) {
13291                 sctp_m_freem(control);
13292         }
13293         return (error);
13294 }
13295
13296
13297 /*
13298  * generate an AUTHentication chunk, if required
13299  */
13300 struct mbuf *
13301 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13302     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13303     struct sctp_tcb *stcb, uint8_t chunk)
13304 {
13305         struct mbuf *m_auth;
13306         struct sctp_auth_chunk *auth;
13307         int chunk_len;
13308         struct mbuf *cn;
13309
13310         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13311             (stcb == NULL))
13312                 return (m);
13313
13314         /* sysctl disabled auth? */
13315         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13316                 return (m);
13317
13318         /* peer doesn't do auth... */
13319         if (!stcb->asoc.peer_supports_auth) {
13320                 return (m);
13321         }
13322         /* does the requested chunk require auth? */
13323         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13324                 return (m);
13325         }
13326         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13327         if (m_auth == NULL) {
13328                 /* no mbuf's */
13329                 return (m);
13330         }
13331         /* reserve some space if this will be the first mbuf */
13332         if (m == NULL)
13333                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13334         /* fill in the AUTH chunk details */
13335         auth = mtod(m_auth, struct sctp_auth_chunk *);
13336         bzero(auth, sizeof(*auth));
13337         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13338         auth->ch.chunk_flags = 0;
13339         chunk_len = sizeof(*auth) +
13340             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13341         auth->ch.chunk_length = htons(chunk_len);
13342         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13343         /* key id and hmac digest will be computed and filled in upon send */
13344
13345         /* save the offset where the auth was inserted into the chain */
13346         *offset = 0;
13347         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13348                 *offset += SCTP_BUF_LEN(cn);
13349         }
13350
13351         /* update length and return pointer to the auth chunk */
13352         SCTP_BUF_LEN(m_auth) = chunk_len;
13353         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13354         if (auth_ret != NULL)
13355                 *auth_ret = auth;
13356
13357         return (m);
13358 }
13359
13360 #ifdef INET6
13361 int
13362 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13363 {
13364         struct nd_prefix *pfx = NULL;
13365         struct nd_pfxrouter *pfxrtr = NULL;
13366         struct sockaddr_in6 gw6;
13367
13368         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13369                 return (0);
13370
13371         /* get prefix entry of address */
13372         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13373                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13374                         continue;
13375                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13376                     &src6->sin6_addr, &pfx->ndpr_mask))
13377                         break;
13378         }
13379         /* no prefix entry in the prefix list */
13380         if (pfx == NULL) {
13381                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13382                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13383                 return (0);
13384         }
13385         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13386         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13387
13388         /* search installed gateway from prefix entry */
13389         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13390                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13391                 gw6.sin6_family = AF_INET6;
13392                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13393                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13394                     sizeof(struct in6_addr));
13395                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13396                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13397                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13398                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13399                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13400                     ro->ro_rt->rt_gateway)) {
13401                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13402                         return (1);
13403                 }
13404         }
13405         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13406         return (0);
13407 }
13408
13409 #endif
13410
13411 int
13412 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13413 {
13414 #ifdef INET
13415         struct sockaddr_in *sin, *mask;
13416         struct ifaddr *ifa;
13417         struct in_addr srcnetaddr, gwnetaddr;
13418
13419         if (ro == NULL || ro->ro_rt == NULL ||
13420             sifa->address.sa.sa_family != AF_INET) {
13421                 return (0);
13422         }
13423         ifa = (struct ifaddr *)sifa->ifa;
13424         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13425         sin = (struct sockaddr_in *)&sifa->address.sin;
13426         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13427         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13428         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13429         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13430
13431         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13432         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13433         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13434         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13435         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13436         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13437                 return (1);
13438         }
13439 #endif
13440         return (0);
13441 }