sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #include <netinet/udp.h>
  54 #include <netinet/udp_var.h>
  55 #include <machine/in_cksum.h>
  56
  57
  58
  59 #define SCTP_MAX_GAPS_INARRAY 4
  60 struct sack_track {
  61         uint8_t right_edge;     /* mergable on the right edge */
  62         uint8_t left_edge;      /* mergable on the left edge */
  63         uint8_t num_entries;
  64         uint8_t spare;
  65         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  66 };
  67
  68 struct sack_track sack_array[256] = {
  69         {0, 0, 0, 0,            /* 0x00 */
  70                 {{0, 0},
  71                 {0, 0},
  72                 {0, 0},
  73                 {0, 0}
  74                 }
  75         },
  76         {1, 0, 1, 0,            /* 0x01 */
  77                 {{0, 0},
  78                 {0, 0},
  79                 {0, 0},
  80                 {0, 0}
  81                 }
  82         },
  83         {0, 0, 1, 0,            /* 0x02 */
  84                 {{1, 1},
  85                 {0, 0},
  86                 {0, 0},
  87                 {0, 0}
  88                 }
  89         },
  90         {1, 0, 1, 0,            /* 0x03 */
  91                 {{0, 1},
  92                 {0, 0},
  93                 {0, 0},
  94                 {0, 0}
  95                 }
  96         },
  97         {0, 0, 1, 0,            /* 0x04 */
  98                 {{2, 2},
  99                 {0, 0},
 100                 {0, 0},
 101                 {0, 0}
 102                 }
 103         },
 104         {1, 0, 2, 0,            /* 0x05 */
 105                 {{0, 0},
 106                 {2, 2},
 107                 {0, 0},
 108                 {0, 0}
 109                 }
 110         },
 111         {0, 0, 1, 0,            /* 0x06 */
 112                 {{1, 2},
 113                 {0, 0},
 114                 {0, 0},
 115                 {0, 0}
 116                 }
 117         },
 118         {1, 0, 1, 0,            /* 0x07 */
 119                 {{0, 2},
 120                 {0, 0},
 121                 {0, 0},
 122                 {0, 0}
 123                 }
 124         },
 125         {0, 0, 1, 0,            /* 0x08 */
 126                 {{3, 3},
 127                 {0, 0},
 128                 {0, 0},
 129                 {0, 0}
 130                 }
 131         },
 132         {1, 0, 2, 0,            /* 0x09 */
 133                 {{0, 0},
 134                 {3, 3},
 135                 {0, 0},
 136                 {0, 0}
 137                 }
 138         },
 139         {0, 0, 2, 0,            /* 0x0a */
 140                 {{1, 1},
 141                 {3, 3},
 142                 {0, 0},
 143                 {0, 0}
 144                 }
 145         },
 146         {1, 0, 2, 0,            /* 0x0b */
 147                 {{0, 1},
 148                 {3, 3},
 149                 {0, 0},
 150                 {0, 0}
 151                 }
 152         },
 153         {0, 0, 1, 0,            /* 0x0c */
 154                 {{2, 3},
 155                 {0, 0},
 156                 {0, 0},
 157                 {0, 0}
 158                 }
 159         },
 160         {1, 0, 2, 0,            /* 0x0d */
 161                 {{0, 0},
 162                 {2, 3},
 163                 {0, 0},
 164                 {0, 0}
 165                 }
 166         },
 167         {0, 0, 1, 0,            /* 0x0e */
 168                 {{1, 3},
 169                 {0, 0},
 170                 {0, 0},
 171                 {0, 0}
 172                 }
 173         },
 174         {1, 0, 1, 0,            /* 0x0f */
 175                 {{0, 3},
 176                 {0, 0},
 177                 {0, 0},
 178                 {0, 0}
 179                 }
 180         },
 181         {0, 0, 1, 0,            /* 0x10 */
 182                 {{4, 4},
 183                 {0, 0},
 184                 {0, 0},
 185                 {0, 0}
 186                 }
 187         },
 188         {1, 0, 2, 0,            /* 0x11 */
 189                 {{0, 0},
 190                 {4, 4},
 191                 {0, 0},
 192                 {0, 0}
 193                 }
 194         },
 195         {0, 0, 2, 0,            /* 0x12 */
 196                 {{1, 1},
 197                 {4, 4},
 198                 {0, 0},
 199                 {0, 0}
 200                 }
 201         },
 202         {1, 0, 2, 0,            /* 0x13 */
 203                 {{0, 1},
 204                 {4, 4},
 205                 {0, 0},
 206                 {0, 0}
 207                 }
 208         },
 209         {0, 0, 2, 0,            /* 0x14 */
 210                 {{2, 2},
 211                 {4, 4},
 212                 {0, 0},
 213                 {0, 0}
 214                 }
 215         },
 216         {1, 0, 3, 0,            /* 0x15 */
 217                 {{0, 0},
 218                 {2, 2},
 219                 {4, 4},
 220                 {0, 0}
 221                 }
 222         },
 223         {0, 0, 2, 0,            /* 0x16 */
 224                 {{1, 2},
 225                 {4, 4},
 226                 {0, 0},
 227                 {0, 0}
 228                 }
 229         },
 230         {1, 0, 2, 0,            /* 0x17 */
 231                 {{0, 2},
 232                 {4, 4},
 233                 {0, 0},
 234                 {0, 0}
 235                 }
 236         },
 237         {0, 0, 1, 0,            /* 0x18 */
 238                 {{3, 4},
 239                 {0, 0},
 240                 {0, 0},
 241                 {0, 0}
 242                 }
 243         },
 244         {1, 0, 2, 0,            /* 0x19 */
 245                 {{0, 0},
 246                 {3, 4},
 247                 {0, 0},
 248                 {0, 0}
 249                 }
 250         },
 251         {0, 0, 2, 0,            /* 0x1a */
 252                 {{1, 1},
 253                 {3, 4},
 254                 {0, 0},
 255                 {0, 0}
 256                 }
 257         },
 258         {1, 0, 2, 0,            /* 0x1b */
 259                 {{0, 1},
 260                 {3, 4},
 261                 {0, 0},
 262                 {0, 0}
 263                 }
 264         },
 265         {0, 0, 1, 0,            /* 0x1c */
 266                 {{2, 4},
 267                 {0, 0},
 268                 {0, 0},
 269                 {0, 0}
 270                 }
 271         },
 272         {1, 0, 2, 0,            /* 0x1d */
 273                 {{0, 0},
 274                 {2, 4},
 275                 {0, 0},
 276                 {0, 0}
 277                 }
 278         },
 279         {0, 0, 1, 0,            /* 0x1e */
 280                 {{1, 4},
 281                 {0, 0},
 282                 {0, 0},
 283                 {0, 0}
 284                 }
 285         },
 286         {1, 0, 1, 0,            /* 0x1f */
 287                 {{0, 4},
 288                 {0, 0},
 289                 {0, 0},
 290                 {0, 0}
 291                 }
 292         },
 293         {0, 0, 1, 0,            /* 0x20 */
 294                 {{5, 5},
 295                 {0, 0},
 296                 {0, 0},
 297                 {0, 0}
 298                 }
 299         },
 300         {1, 0, 2, 0,            /* 0x21 */
 301                 {{0, 0},
 302                 {5, 5},
 303                 {0, 0},
 304                 {0, 0}
 305                 }
 306         },
 307         {0, 0, 2, 0,            /* 0x22 */
 308                 {{1, 1},
 309                 {5, 5},
 310                 {0, 0},
 311                 {0, 0}
 312                 }
 313         },
 314         {1, 0, 2, 0,            /* 0x23 */
 315                 {{0, 1},
 316                 {5, 5},
 317                 {0, 0},
 318                 {0, 0}
 319                 }
 320         },
 321         {0, 0, 2, 0,            /* 0x24 */
 322                 {{2, 2},
 323                 {5, 5},
 324                 {0, 0},
 325                 {0, 0}
 326                 }
 327         },
 328         {1, 0, 3, 0,            /* 0x25 */
 329                 {{0, 0},
 330                 {2, 2},
 331                 {5, 5},
 332                 {0, 0}
 333                 }
 334         },
 335         {0, 0, 2, 0,            /* 0x26 */
 336                 {{1, 2},
 337                 {5, 5},
 338                 {0, 0},
 339                 {0, 0}
 340                 }
 341         },
 342         {1, 0, 2, 0,            /* 0x27 */
 343                 {{0, 2},
 344                 {5, 5},
 345                 {0, 0},
 346                 {0, 0}
 347                 }
 348         },
 349         {0, 0, 2, 0,            /* 0x28 */
 350                 {{3, 3},
 351                 {5, 5},
 352                 {0, 0},
 353                 {0, 0}
 354                 }
 355         },
 356         {1, 0, 3, 0,            /* 0x29 */
 357                 {{0, 0},
 358                 {3, 3},
 359                 {5, 5},
 360                 {0, 0}
 361                 }
 362         },
 363         {0, 0, 3, 0,            /* 0x2a */
 364                 {{1, 1},
 365                 {3, 3},
 366                 {5, 5},
 367                 {0, 0}
 368                 }
 369         },
 370         {1, 0, 3, 0,            /* 0x2b */
 371                 {{0, 1},
 372                 {3, 3},
 373                 {5, 5},
 374                 {0, 0}
 375                 }
 376         },
 377         {0, 0, 2, 0,            /* 0x2c */
 378                 {{2, 3},
 379                 {5, 5},
 380                 {0, 0},
 381                 {0, 0}
 382                 }
 383         },
 384         {1, 0, 3, 0,            /* 0x2d */
 385                 {{0, 0},
 386                 {2, 3},
 387                 {5, 5},
 388                 {0, 0}
 389                 }
 390         },
 391         {0, 0, 2, 0,            /* 0x2e */
 392                 {{1, 3},
 393                 {5, 5},
 394                 {0, 0},
 395                 {0, 0}
 396                 }
 397         },
 398         {1, 0, 2, 0,            /* 0x2f */
 399                 {{0, 3},
 400                 {5, 5},
 401                 {0, 0},
 402                 {0, 0}
 403                 }
 404         },
 405         {0, 0, 1, 0,            /* 0x30 */
 406                 {{4, 5},
 407                 {0, 0},
 408                 {0, 0},
 409                 {0, 0}
 410                 }
 411         },
 412         {1, 0, 2, 0,            /* 0x31 */
 413                 {{0, 0},
 414                 {4, 5},
 415                 {0, 0},
 416                 {0, 0}
 417                 }
 418         },
 419         {0, 0, 2, 0,            /* 0x32 */
 420                 {{1, 1},
 421                 {4, 5},
 422                 {0, 0},
 423                 {0, 0}
 424                 }
 425         },
 426         {1, 0, 2, 0,            /* 0x33 */
 427                 {{0, 1},
 428                 {4, 5},
 429                 {0, 0},
 430                 {0, 0}
 431                 }
 432         },
 433         {0, 0, 2, 0,            /* 0x34 */
 434                 {{2, 2},
 435                 {4, 5},
 436                 {0, 0},
 437                 {0, 0}
 438                 }
 439         },
 440         {1, 0, 3, 0,            /* 0x35 */
 441                 {{0, 0},
 442                 {2, 2},
 443                 {4, 5},
 444                 {0, 0}
 445                 }
 446         },
 447         {0, 0, 2, 0,            /* 0x36 */
 448                 {{1, 2},
 449                 {4, 5},
 450                 {0, 0},
 451                 {0, 0}
 452                 }
 453         },
 454         {1, 0, 2, 0,            /* 0x37 */
 455                 {{0, 2},
 456                 {4, 5},
 457                 {0, 0},
 458                 {0, 0}
 459                 }
 460         },
 461         {0, 0, 1, 0,            /* 0x38 */
 462                 {{3, 5},
 463                 {0, 0},
 464                 {0, 0},
 465                 {0, 0}
 466                 }
 467         },
 468         {1, 0, 2, 0,            /* 0x39 */
 469                 {{0, 0},
 470                 {3, 5},
 471                 {0, 0},
 472                 {0, 0}
 473                 }
 474         },
 475         {0, 0, 2, 0,            /* 0x3a */
 476                 {{1, 1},
 477                 {3, 5},
 478                 {0, 0},
 479                 {0, 0}
 480                 }
 481         },
 482         {1, 0, 2, 0,            /* 0x3b */
 483                 {{0, 1},
 484                 {3, 5},
 485                 {0, 0},
 486                 {0, 0}
 487                 }
 488         },
 489         {0, 0, 1, 0,            /* 0x3c */
 490                 {{2, 5},
 491                 {0, 0},
 492                 {0, 0},
 493                 {0, 0}
 494                 }
 495         },
 496         {1, 0, 2, 0,            /* 0x3d */
 497                 {{0, 0},
 498                 {2, 5},
 499                 {0, 0},
 500                 {0, 0}
 501                 }
 502         },
 503         {0, 0, 1, 0,            /* 0x3e */
 504                 {{1, 5},
 505                 {0, 0},
 506                 {0, 0},
 507                 {0, 0}
 508                 }
 509         },
 510         {1, 0, 1, 0,            /* 0x3f */
 511                 {{0, 5},
 512                 {0, 0},
 513                 {0, 0},
 514                 {0, 0}
 515                 }
 516         },
 517         {0, 0, 1, 0,            /* 0x40 */
 518                 {{6, 6},
 519                 {0, 0},
 520                 {0, 0},
 521                 {0, 0}
 522                 }
 523         },
 524         {1, 0, 2, 0,            /* 0x41 */
 525                 {{0, 0},
 526                 {6, 6},
 527                 {0, 0},
 528                 {0, 0}
 529                 }
 530         },
 531         {0, 0, 2, 0,            /* 0x42 */
 532                 {{1, 1},
 533                 {6, 6},
 534                 {0, 0},
 535                 {0, 0}
 536                 }
 537         },
 538         {1, 0, 2, 0,            /* 0x43 */
 539                 {{0, 1},
 540                 {6, 6},
 541                 {0, 0},
 542                 {0, 0}
 543                 }
 544         },
 545         {0, 0, 2, 0,            /* 0x44 */
 546                 {{2, 2},
 547                 {6, 6},
 548                 {0, 0},
 549                 {0, 0}
 550                 }
 551         },
 552         {1, 0, 3, 0,            /* 0x45 */
 553                 {{0, 0},
 554                 {2, 2},
 555                 {6, 6},
 556                 {0, 0}
 557                 }
 558         },
 559         {0, 0, 2, 0,            /* 0x46 */
 560                 {{1, 2},
 561                 {6, 6},
 562                 {0, 0},
 563                 {0, 0}
 564                 }
 565         },
 566         {1, 0, 2, 0,            /* 0x47 */
 567                 {{0, 2},
 568                 {6, 6},
 569                 {0, 0},
 570                 {0, 0}
 571                 }
 572         },
 573         {0, 0, 2, 0,            /* 0x48 */
 574                 {{3, 3},
 575                 {6, 6},
 576                 {0, 0},
 577                 {0, 0}
 578                 }
 579         },
 580         {1, 0, 3, 0,            /* 0x49 */
 581                 {{0, 0},
 582                 {3, 3},
 583                 {6, 6},
 584                 {0, 0}
 585                 }
 586         },
 587         {0, 0, 3, 0,            /* 0x4a */
 588                 {{1, 1},
 589                 {3, 3},
 590                 {6, 6},
 591                 {0, 0}
 592                 }
 593         },
 594         {1, 0, 3, 0,            /* 0x4b */
 595                 {{0, 1},
 596                 {3, 3},
 597                 {6, 6},
 598                 {0, 0}
 599                 }
 600         },
 601         {0, 0, 2, 0,            /* 0x4c */
 602                 {{2, 3},
 603                 {6, 6},
 604                 {0, 0},
 605                 {0, 0}
 606                 }
 607         },
 608         {1, 0, 3, 0,            /* 0x4d */
 609                 {{0, 0},
 610                 {2, 3},
 611                 {6, 6},
 612                 {0, 0}
 613                 }
 614         },
 615         {0, 0, 2, 0,            /* 0x4e */
 616                 {{1, 3},
 617                 {6, 6},
 618                 {0, 0},
 619                 {0, 0}
 620                 }
 621         },
 622         {1, 0, 2, 0,            /* 0x4f */
 623                 {{0, 3},
 624                 {6, 6},
 625                 {0, 0},
 626                 {0, 0}
 627                 }
 628         },
 629         {0, 0, 2, 0,            /* 0x50 */
 630                 {{4, 4},
 631                 {6, 6},
 632                 {0, 0},
 633                 {0, 0}
 634                 }
 635         },
 636         {1, 0, 3, 0,            /* 0x51 */
 637                 {{0, 0},
 638                 {4, 4},
 639                 {6, 6},
 640                 {0, 0}
 641                 }
 642         },
 643         {0, 0, 3, 0,            /* 0x52 */
 644                 {{1, 1},
 645                 {4, 4},
 646                 {6, 6},
 647                 {0, 0}
 648                 }
 649         },
 650         {1, 0, 3, 0,            /* 0x53 */
 651                 {{0, 1},
 652                 {4, 4},
 653                 {6, 6},
 654                 {0, 0}
 655                 }
 656         },
 657         {0, 0, 3, 0,            /* 0x54 */
 658                 {{2, 2},
 659                 {4, 4},
 660                 {6, 6},
 661                 {0, 0}
 662                 }
 663         },
 664         {1, 0, 4, 0,            /* 0x55 */
 665                 {{0, 0},
 666                 {2, 2},
 667                 {4, 4},
 668                 {6, 6}
 669                 }
 670         },
 671         {0, 0, 3, 0,            /* 0x56 */
 672                 {{1, 2},
 673                 {4, 4},
 674                 {6, 6},
 675                 {0, 0}
 676                 }
 677         },
 678         {1, 0, 3, 0,            /* 0x57 */
 679                 {{0, 2},
 680                 {4, 4},
 681                 {6, 6},
 682                 {0, 0}
 683                 }
 684         },
 685         {0, 0, 2, 0,            /* 0x58 */
 686                 {{3, 4},
 687                 {6, 6},
 688                 {0, 0},
 689                 {0, 0}
 690                 }
 691         },
 692         {1, 0, 3, 0,            /* 0x59 */
 693                 {{0, 0},
 694                 {3, 4},
 695                 {6, 6},
 696                 {0, 0}
 697                 }
 698         },
 699         {0, 0, 3, 0,            /* 0x5a */
 700                 {{1, 1},
 701                 {3, 4},
 702                 {6, 6},
 703                 {0, 0}
 704                 }
 705         },
 706         {1, 0, 3, 0,            /* 0x5b */
 707                 {{0, 1},
 708                 {3, 4},
 709                 {6, 6},
 710                 {0, 0}
 711                 }
 712         },
 713         {0, 0, 2, 0,            /* 0x5c */
 714                 {{2, 4},
 715                 {6, 6},
 716                 {0, 0},
 717                 {0, 0}
 718                 }
 719         },
 720         {1, 0, 3, 0,            /* 0x5d */
 721                 {{0, 0},
 722                 {2, 4},
 723                 {6, 6},
 724                 {0, 0}
 725                 }
 726         },
 727         {0, 0, 2, 0,            /* 0x5e */
 728                 {{1, 4},
 729                 {6, 6},
 730                 {0, 0},
 731                 {0, 0}
 732                 }
 733         },
 734         {1, 0, 2, 0,            /* 0x5f */
 735                 {{0, 4},
 736                 {6, 6},
 737                 {0, 0},
 738                 {0, 0}
 739                 }
 740         },
 741         {0, 0, 1, 0,            /* 0x60 */
 742                 {{5, 6},
 743                 {0, 0},
 744                 {0, 0},
 745                 {0, 0}
 746                 }
 747         },
 748         {1, 0, 2, 0,            /* 0x61 */
 749                 {{0, 0},
 750                 {5, 6},
 751                 {0, 0},
 752                 {0, 0}
 753                 }
 754         },
 755         {0, 0, 2, 0,            /* 0x62 */
 756                 {{1, 1},
 757                 {5, 6},
 758                 {0, 0},
 759                 {0, 0}
 760                 }
 761         },
 762         {1, 0, 2, 0,            /* 0x63 */
 763                 {{0, 1},
 764                 {5, 6},
 765                 {0, 0},
 766                 {0, 0}
 767                 }
 768         },
 769         {0, 0, 2, 0,            /* 0x64 */
 770                 {{2, 2},
 771                 {5, 6},
 772                 {0, 0},
 773                 {0, 0}
 774                 }
 775         },
 776         {1, 0, 3, 0,            /* 0x65 */
 777                 {{0, 0},
 778                 {2, 2},
 779                 {5, 6},
 780                 {0, 0}
 781                 }
 782         },
 783         {0, 0, 2, 0,            /* 0x66 */
 784                 {{1, 2},
 785                 {5, 6},
 786                 {0, 0},
 787                 {0, 0}
 788                 }
 789         },
 790         {1, 0, 2, 0,            /* 0x67 */
 791                 {{0, 2},
 792                 {5, 6},
 793                 {0, 0},
 794                 {0, 0}
 795                 }
 796         },
 797         {0, 0, 2, 0,            /* 0x68 */
 798                 {{3, 3},
 799                 {5, 6},
 800                 {0, 0},
 801                 {0, 0}
 802                 }
 803         },
 804         {1, 0, 3, 0,            /* 0x69 */
 805                 {{0, 0},
 806                 {3, 3},
 807                 {5, 6},
 808                 {0, 0}
 809                 }
 810         },
 811         {0, 0, 3, 0,            /* 0x6a */
 812                 {{1, 1},
 813                 {3, 3},
 814                 {5, 6},
 815                 {0, 0}
 816                 }
 817         },
 818         {1, 0, 3, 0,            /* 0x6b */
 819                 {{0, 1},
 820                 {3, 3},
 821                 {5, 6},
 822                 {0, 0}
 823                 }
 824         },
 825         {0, 0, 2, 0,            /* 0x6c */
 826                 {{2, 3},
 827                 {5, 6},
 828                 {0, 0},
 829                 {0, 0}
 830                 }
 831         },
 832         {1, 0, 3, 0,            /* 0x6d */
 833                 {{0, 0},
 834                 {2, 3},
 835                 {5, 6},
 836                 {0, 0}
 837                 }
 838         },
 839         {0, 0, 2, 0,            /* 0x6e */
 840                 {{1, 3},
 841                 {5, 6},
 842                 {0, 0},
 843                 {0, 0}
 844                 }
 845         },
 846         {1, 0, 2, 0,            /* 0x6f */
 847                 {{0, 3},
 848                 {5, 6},
 849                 {0, 0},
 850                 {0, 0}
 851                 }
 852         },
 853         {0, 0, 1, 0,            /* 0x70 */
 854                 {{4, 6},
 855                 {0, 0},
 856                 {0, 0},
 857                 {0, 0}
 858                 }
 859         },
 860         {1, 0, 2, 0,            /* 0x71 */
 861                 {{0, 0},
 862                 {4, 6},
 863                 {0, 0},
 864                 {0, 0}
 865                 }
 866         },
 867         {0, 0, 2, 0,            /* 0x72 */
 868                 {{1, 1},
 869                 {4, 6},
 870                 {0, 0},
 871                 {0, 0}
 872                 }
 873         },
 874         {1, 0, 2, 0,            /* 0x73 */
 875                 {{0, 1},
 876                 {4, 6},
 877                 {0, 0},
 878                 {0, 0}
 879                 }
 880         },
 881         {0, 0, 2, 0,            /* 0x74 */
 882                 {{2, 2},
 883                 {4, 6},
 884                 {0, 0},
 885                 {0, 0}
 886                 }
 887         },
 888         {1, 0, 3, 0,            /* 0x75 */
 889                 {{0, 0},
 890                 {2, 2},
 891                 {4, 6},
 892                 {0, 0}
 893                 }
 894         },
 895         {0, 0, 2, 0,            /* 0x76 */
 896                 {{1, 2},
 897                 {4, 6},
 898                 {0, 0},
 899                 {0, 0}
 900                 }
 901         },
 902         {1, 0, 2, 0,            /* 0x77 */
 903                 {{0, 2},
 904                 {4, 6},
 905                 {0, 0},
 906                 {0, 0}
 907                 }
 908         },
 909         {0, 0, 1, 0,            /* 0x78 */
 910                 {{3, 6},
 911                 {0, 0},
 912                 {0, 0},
 913                 {0, 0}
 914                 }
 915         },
 916         {1, 0, 2, 0,            /* 0x79 */
 917                 {{0, 0},
 918                 {3, 6},
 919                 {0, 0},
 920                 {0, 0}
 921                 }
 922         },
 923         {0, 0, 2, 0,            /* 0x7a */
 924                 {{1, 1},
 925                 {3, 6},
 926                 {0, 0},
 927                 {0, 0}
 928                 }
 929         },
 930         {1, 0, 2, 0,            /* 0x7b */
 931                 {{0, 1},
 932                 {3, 6},
 933                 {0, 0},
 934                 {0, 0}
 935                 }
 936         },
 937         {0, 0, 1, 0,            /* 0x7c */
 938                 {{2, 6},
 939                 {0, 0},
 940                 {0, 0},
 941                 {0, 0}
 942                 }
 943         },
 944         {1, 0, 2, 0,            /* 0x7d */
 945                 {{0, 0},
 946                 {2, 6},
 947                 {0, 0},
 948                 {0, 0}
 949                 }
 950         },
 951         {0, 0, 1, 0,            /* 0x7e */
 952                 {{1, 6},
 953                 {0, 0},
 954                 {0, 0},
 955                 {0, 0}
 956                 }
 957         },
 958         {1, 0, 1, 0,            /* 0x7f */
 959                 {{0, 6},
 960                 {0, 0},
 961                 {0, 0},
 962                 {0, 0}
 963                 }
 964         },
 965         {0, 1, 1, 0,            /* 0x80 */
 966                 {{7, 7},
 967                 {0, 0},
 968                 {0, 0},
 969                 {0, 0}
 970                 }
 971         },
 972         {1, 1, 2, 0,            /* 0x81 */
 973                 {{0, 0},
 974                 {7, 7},
 975                 {0, 0},
 976                 {0, 0}
 977                 }
 978         },
 979         {0, 1, 2, 0,            /* 0x82 */
 980                 {{1, 1},
 981                 {7, 7},
 982                 {0, 0},
 983                 {0, 0}
 984                 }
 985         },
 986         {1, 1, 2, 0,            /* 0x83 */
 987                 {{0, 1},
 988                 {7, 7},
 989                 {0, 0},
 990                 {0, 0}
 991                 }
 992         },
 993         {0, 1, 2, 0,            /* 0x84 */
 994                 {{2, 2},
 995                 {7, 7},
 996                 {0, 0},
 997                 {0, 0}
 998                 }
 999         },
1000         {1, 1, 3, 0,            /* 0x85 */
1001                 {{0, 0},
1002                 {2, 2},
1003                 {7, 7},
1004                 {0, 0}
1005                 }
1006         },
1007         {0, 1, 2, 0,            /* 0x86 */
1008                 {{1, 2},
1009                 {7, 7},
1010                 {0, 0},
1011                 {0, 0}
1012                 }
1013         },
1014         {1, 1, 2, 0,            /* 0x87 */
1015                 {{0, 2},
1016                 {7, 7},
1017                 {0, 0},
1018                 {0, 0}
1019                 }
1020         },
1021         {0, 1, 2, 0,            /* 0x88 */
1022                 {{3, 3},
1023                 {7, 7},
1024                 {0, 0},
1025                 {0, 0}
1026                 }
1027         },
1028         {1, 1, 3, 0,            /* 0x89 */
1029                 {{0, 0},
1030                 {3, 3},
1031                 {7, 7},
1032                 {0, 0}
1033                 }
1034         },
1035         {0, 1, 3, 0,            /* 0x8a */
1036                 {{1, 1},
1037                 {3, 3},
1038                 {7, 7},
1039                 {0, 0}
1040                 }
1041         },
1042         {1, 1, 3, 0,            /* 0x8b */
1043                 {{0, 1},
1044                 {3, 3},
1045                 {7, 7},
1046                 {0, 0}
1047                 }
1048         },
1049         {0, 1, 2, 0,            /* 0x8c */
1050                 {{2, 3},
1051                 {7, 7},
1052                 {0, 0},
1053                 {0, 0}
1054                 }
1055         },
1056         {1, 1, 3, 0,            /* 0x8d */
1057                 {{0, 0},
1058                 {2, 3},
1059                 {7, 7},
1060                 {0, 0}
1061                 }
1062         },
1063         {0, 1, 2, 0,            /* 0x8e */
1064                 {{1, 3},
1065                 {7, 7},
1066                 {0, 0},
1067                 {0, 0}
1068                 }
1069         },
1070         {1, 1, 2, 0,            /* 0x8f */
1071                 {{0, 3},
1072                 {7, 7},
1073                 {0, 0},
1074                 {0, 0}
1075                 }
1076         },
1077         {0, 1, 2, 0,            /* 0x90 */
1078                 {{4, 4},
1079                 {7, 7},
1080                 {0, 0},
1081                 {0, 0}
1082                 }
1083         },
1084         {1, 1, 3, 0,            /* 0x91 */
1085                 {{0, 0},
1086                 {4, 4},
1087                 {7, 7},
1088                 {0, 0}
1089                 }
1090         },
1091         {0, 1, 3, 0,            /* 0x92 */
1092                 {{1, 1},
1093                 {4, 4},
1094                 {7, 7},
1095                 {0, 0}
1096                 }
1097         },
1098         {1, 1, 3, 0,            /* 0x93 */
1099                 {{0, 1},
1100                 {4, 4},
1101                 {7, 7},
1102                 {0, 0}
1103                 }
1104         },
1105         {0, 1, 3, 0,            /* 0x94 */
1106                 {{2, 2},
1107                 {4, 4},
1108                 {7, 7},
1109                 {0, 0}
1110                 }
1111         },
1112         {1, 1, 4, 0,            /* 0x95 */
1113                 {{0, 0},
1114                 {2, 2},
1115                 {4, 4},
1116                 {7, 7}
1117                 }
1118         },
1119         {0, 1, 3, 0,            /* 0x96 */
1120                 {{1, 2},
1121                 {4, 4},
1122                 {7, 7},
1123                 {0, 0}
1124                 }
1125         },
1126         {1, 1, 3, 0,            /* 0x97 */
1127                 {{0, 2},
1128                 {4, 4},
1129                 {7, 7},
1130                 {0, 0}
1131                 }
1132         },
1133         {0, 1, 2, 0,            /* 0x98 */
1134                 {{3, 4},
1135                 {7, 7},
1136                 {0, 0},
1137                 {0, 0}
1138                 }
1139         },
1140         {1, 1, 3, 0,            /* 0x99 */
1141                 {{0, 0},
1142                 {3, 4},
1143                 {7, 7},
1144                 {0, 0}
1145                 }
1146         },
1147         {0, 1, 3, 0,            /* 0x9a */
1148                 {{1, 1},
1149                 {3, 4},
1150                 {7, 7},
1151                 {0, 0}
1152                 }
1153         },
1154         {1, 1, 3, 0,            /* 0x9b */
1155                 {{0, 1},
1156                 {3, 4},
1157                 {7, 7},
1158                 {0, 0}
1159                 }
1160         },
1161         {0, 1, 2, 0,            /* 0x9c */
1162                 {{2, 4},
1163                 {7, 7},
1164                 {0, 0},
1165                 {0, 0}
1166                 }
1167         },
1168         {1, 1, 3, 0,            /* 0x9d */
1169                 {{0, 0},
1170                 {2, 4},
1171                 {7, 7},
1172                 {0, 0}
1173                 }
1174         },
1175         {0, 1, 2, 0,            /* 0x9e */
1176                 {{1, 4},
1177                 {7, 7},
1178                 {0, 0},
1179                 {0, 0}
1180                 }
1181         },
1182         {1, 1, 2, 0,            /* 0x9f */
1183                 {{0, 4},
1184                 {7, 7},
1185                 {0, 0},
1186                 {0, 0}
1187                 }
1188         },
1189         {0, 1, 2, 0,            /* 0xa0 */
1190                 {{5, 5},
1191                 {7, 7},
1192                 {0, 0},
1193                 {0, 0}
1194                 }
1195         },
1196         {1, 1, 3, 0,            /* 0xa1 */
1197                 {{0, 0},
1198                 {5, 5},
1199                 {7, 7},
1200                 {0, 0}
1201                 }
1202         },
1203         {0, 1, 3, 0,            /* 0xa2 */
1204                 {{1, 1},
1205                 {5, 5},
1206                 {7, 7},
1207                 {0, 0}
1208                 }
1209         },
1210         {1, 1, 3, 0,            /* 0xa3 */
1211                 {{0, 1},
1212                 {5, 5},
1213                 {7, 7},
1214                 {0, 0}
1215                 }
1216         },
1217         {0, 1, 3, 0,            /* 0xa4 */
1218                 {{2, 2},
1219                 {5, 5},
1220                 {7, 7},
1221                 {0, 0}
1222                 }
1223         },
1224         {1, 1, 4, 0,            /* 0xa5 */
1225                 {{0, 0},
1226                 {2, 2},
1227                 {5, 5},
1228                 {7, 7}
1229                 }
1230         },
1231         {0, 1, 3, 0,            /* 0xa6 */
1232                 {{1, 2},
1233                 {5, 5},
1234                 {7, 7},
1235                 {0, 0}
1236                 }
1237         },
1238         {1, 1, 3, 0,            /* 0xa7 */
1239                 {{0, 2},
1240                 {5, 5},
1241                 {7, 7},
1242                 {0, 0}
1243                 }
1244         },
1245         {0, 1, 3, 0,            /* 0xa8 */
1246                 {{3, 3},
1247                 {5, 5},
1248                 {7, 7},
1249                 {0, 0}
1250                 }
1251         },
1252         {1, 1, 4, 0,            /* 0xa9 */
1253                 {{0, 0},
1254                 {3, 3},
1255                 {5, 5},
1256                 {7, 7}
1257                 }
1258         },
1259         {0, 1, 4, 0,            /* 0xaa */
1260                 {{1, 1},
1261                 {3, 3},
1262                 {5, 5},
1263                 {7, 7}
1264                 }
1265         },
1266         {1, 1, 4, 0,            /* 0xab */
1267                 {{0, 1},
1268                 {3, 3},
1269                 {5, 5},
1270                 {7, 7}
1271                 }
1272         },
1273         {0, 1, 3, 0,            /* 0xac */
1274                 {{2, 3},
1275                 {5, 5},
1276                 {7, 7},
1277                 {0, 0}
1278                 }
1279         },
1280         {1, 1, 4, 0,            /* 0xad */
1281                 {{0, 0},
1282                 {2, 3},
1283                 {5, 5},
1284                 {7, 7}
1285                 }
1286         },
1287         {0, 1, 3, 0,            /* 0xae */
1288                 {{1, 3},
1289                 {5, 5},
1290                 {7, 7},
1291                 {0, 0}
1292                 }
1293         },
1294         {1, 1, 3, 0,            /* 0xaf */
1295                 {{0, 3},
1296                 {5, 5},
1297                 {7, 7},
1298                 {0, 0}
1299                 }
1300         },
1301         {0, 1, 2, 0,            /* 0xb0 */
1302                 {{4, 5},
1303                 {7, 7},
1304                 {0, 0},
1305                 {0, 0}
1306                 }
1307         },
1308         {1, 1, 3, 0,            /* 0xb1 */
1309                 {{0, 0},
1310                 {4, 5},
1311                 {7, 7},
1312                 {0, 0}
1313                 }
1314         },
1315         {0, 1, 3, 0,            /* 0xb2 */
1316                 {{1, 1},
1317                 {4, 5},
1318                 {7, 7},
1319                 {0, 0}
1320                 }
1321         },
1322         {1, 1, 3, 0,            /* 0xb3 */
1323                 {{0, 1},
1324                 {4, 5},
1325                 {7, 7},
1326                 {0, 0}
1327                 }
1328         },
1329         {0, 1, 3, 0,            /* 0xb4 */
1330                 {{2, 2},
1331                 {4, 5},
1332                 {7, 7},
1333                 {0, 0}
1334                 }
1335         },
1336         {1, 1, 4, 0,            /* 0xb5 */
1337                 {{0, 0},
1338                 {2, 2},
1339                 {4, 5},
1340                 {7, 7}
1341                 }
1342         },
1343         {0, 1, 3, 0,            /* 0xb6 */
1344                 {{1, 2},
1345                 {4, 5},
1346                 {7, 7},
1347                 {0, 0}
1348                 }
1349         },
1350         {1, 1, 3, 0,            /* 0xb7 */
1351                 {{0, 2},
1352                 {4, 5},
1353                 {7, 7},
1354                 {0, 0}
1355                 }
1356         },
1357         {0, 1, 2, 0,            /* 0xb8 */
1358                 {{3, 5},
1359                 {7, 7},
1360                 {0, 0},
1361                 {0, 0}
1362                 }
1363         },
1364         {1, 1, 3, 0,            /* 0xb9 */
1365                 {{0, 0},
1366                 {3, 5},
1367                 {7, 7},
1368                 {0, 0}
1369                 }
1370         },
1371         {0, 1, 3, 0,            /* 0xba */
1372                 {{1, 1},
1373                 {3, 5},
1374                 {7, 7},
1375                 {0, 0}
1376                 }
1377         },
1378         {1, 1, 3, 0,            /* 0xbb */
1379                 {{0, 1},
1380                 {3, 5},
1381                 {7, 7},
1382                 {0, 0}
1383                 }
1384         },
1385         {0, 1, 2, 0,            /* 0xbc */
1386                 {{2, 5},
1387                 {7, 7},
1388                 {0, 0},
1389                 {0, 0}
1390                 }
1391         },
1392         {1, 1, 3, 0,            /* 0xbd */
1393                 {{0, 0},
1394                 {2, 5},
1395                 {7, 7},
1396                 {0, 0}
1397                 }
1398         },
1399         {0, 1, 2, 0,            /* 0xbe */
1400                 {{1, 5},
1401                 {7, 7},
1402                 {0, 0},
1403                 {0, 0}
1404                 }
1405         },
1406         {1, 1, 2, 0,            /* 0xbf */
1407                 {{0, 5},
1408                 {7, 7},
1409                 {0, 0},
1410                 {0, 0}
1411                 }
1412         },
1413         {0, 1, 1, 0,            /* 0xc0 */
1414                 {{6, 7},
1415                 {0, 0},
1416                 {0, 0},
1417                 {0, 0}
1418                 }
1419         },
1420         {1, 1, 2, 0,            /* 0xc1 */
1421                 {{0, 0},
1422                 {6, 7},
1423                 {0, 0},
1424                 {0, 0}
1425                 }
1426         },
1427         {0, 1, 2, 0,            /* 0xc2 */
1428                 {{1, 1},
1429                 {6, 7},
1430                 {0, 0},
1431                 {0, 0}
1432                 }
1433         },
1434         {1, 1, 2, 0,            /* 0xc3 */
1435                 {{0, 1},
1436                 {6, 7},
1437                 {0, 0},
1438                 {0, 0}
1439                 }
1440         },
1441         {0, 1, 2, 0,            /* 0xc4 */
1442                 {{2, 2},
1443                 {6, 7},
1444                 {0, 0},
1445                 {0, 0}
1446                 }
1447         },
1448         {1, 1, 3, 0,            /* 0xc5 */
1449                 {{0, 0},
1450                 {2, 2},
1451                 {6, 7},
1452                 {0, 0}
1453                 }
1454         },
1455         {0, 1, 2, 0,            /* 0xc6 */
1456                 {{1, 2},
1457                 {6, 7},
1458                 {0, 0},
1459                 {0, 0}
1460                 }
1461         },
1462         {1, 1, 2, 0,            /* 0xc7 */
1463                 {{0, 2},
1464                 {6, 7},
1465                 {0, 0},
1466                 {0, 0}
1467                 }
1468         },
1469         {0, 1, 2, 0,            /* 0xc8 */
1470                 {{3, 3},
1471                 {6, 7},
1472                 {0, 0},
1473                 {0, 0}
1474                 }
1475         },
1476         {1, 1, 3, 0,            /* 0xc9 */
1477                 {{0, 0},
1478                 {3, 3},
1479                 {6, 7},
1480                 {0, 0}
1481                 }
1482         },
1483         {0, 1, 3, 0,            /* 0xca */
1484                 {{1, 1},
1485                 {3, 3},
1486                 {6, 7},
1487                 {0, 0}
1488                 }
1489         },
1490         {1, 1, 3, 0,            /* 0xcb */
1491                 {{0, 1},
1492                 {3, 3},
1493                 {6, 7},
1494                 {0, 0}
1495                 }
1496         },
1497         {0, 1, 2, 0,            /* 0xcc */
1498                 {{2, 3},
1499                 {6, 7},
1500                 {0, 0},
1501                 {0, 0}
1502                 }
1503         },
1504         {1, 1, 3, 0,            /* 0xcd */
1505                 {{0, 0},
1506                 {2, 3},
1507                 {6, 7},
1508                 {0, 0}
1509                 }
1510         },
1511         {0, 1, 2, 0,            /* 0xce */
1512                 {{1, 3},
1513                 {6, 7},
1514                 {0, 0},
1515                 {0, 0}
1516                 }
1517         },
1518         {1, 1, 2, 0,            /* 0xcf */
1519                 {{0, 3},
1520                 {6, 7},
1521                 {0, 0},
1522                 {0, 0}
1523                 }
1524         },
1525         {0, 1, 2, 0,            /* 0xd0 */
1526                 {{4, 4},
1527                 {6, 7},
1528                 {0, 0},
1529                 {0, 0}
1530                 }
1531         },
1532         {1, 1, 3, 0,            /* 0xd1 */
1533                 {{0, 0},
1534                 {4, 4},
1535                 {6, 7},
1536                 {0, 0}
1537                 }
1538         },
1539         {0, 1, 3, 0,            /* 0xd2 */
1540                 {{1, 1},
1541                 {4, 4},
1542                 {6, 7},
1543                 {0, 0}
1544                 }
1545         },
1546         {1, 1, 3, 0,            /* 0xd3 */
1547                 {{0, 1},
1548                 {4, 4},
1549                 {6, 7},
1550                 {0, 0}
1551                 }
1552         },
1553         {0, 1, 3, 0,            /* 0xd4 */
1554                 {{2, 2},
1555                 {4, 4},
1556                 {6, 7},
1557                 {0, 0}
1558                 }
1559         },
1560         {1, 1, 4, 0,            /* 0xd5 */
1561                 {{0, 0},
1562                 {2, 2},
1563                 {4, 4},
1564                 {6, 7}
1565                 }
1566         },
1567         {0, 1, 3, 0,            /* 0xd6 */
1568                 {{1, 2},
1569                 {4, 4},
1570                 {6, 7},
1571                 {0, 0}
1572                 }
1573         },
1574         {1, 1, 3, 0,            /* 0xd7 */
1575                 {{0, 2},
1576                 {4, 4},
1577                 {6, 7},
1578                 {0, 0}
1579                 }
1580         },
1581         {0, 1, 2, 0,            /* 0xd8 */
1582                 {{3, 4},
1583                 {6, 7},
1584                 {0, 0},
1585                 {0, 0}
1586                 }
1587         },
1588         {1, 1, 3, 0,            /* 0xd9 */
1589                 {{0, 0},
1590                 {3, 4},
1591                 {6, 7},
1592                 {0, 0}
1593                 }
1594         },
1595         {0, 1, 3, 0,            /* 0xda */
1596                 {{1, 1},
1597                 {3, 4},
1598                 {6, 7},
1599                 {0, 0}
1600                 }
1601         },
1602         {1, 1, 3, 0,            /* 0xdb */
1603                 {{0, 1},
1604                 {3, 4},
1605                 {6, 7},
1606                 {0, 0}
1607                 }
1608         },
1609         {0, 1, 2, 0,            /* 0xdc */
1610                 {{2, 4},
1611                 {6, 7},
1612                 {0, 0},
1613                 {0, 0}
1614                 }
1615         },
1616         {1, 1, 3, 0,            /* 0xdd */
1617                 {{0, 0},
1618                 {2, 4},
1619                 {6, 7},
1620                 {0, 0}
1621                 }
1622         },
1623         {0, 1, 2, 0,            /* 0xde */
1624                 {{1, 4},
1625                 {6, 7},
1626                 {0, 0},
1627                 {0, 0}
1628                 }
1629         },
1630         {1, 1, 2, 0,            /* 0xdf */
1631                 {{0, 4},
1632                 {6, 7},
1633                 {0, 0},
1634                 {0, 0}
1635                 }
1636         },
1637         {0, 1, 1, 0,            /* 0xe0 */
1638                 {{5, 7},
1639                 {0, 0},
1640                 {0, 0},
1641                 {0, 0}
1642                 }
1643         },
1644         {1, 1, 2, 0,            /* 0xe1 */
1645                 {{0, 0},
1646                 {5, 7},
1647                 {0, 0},
1648                 {0, 0}
1649                 }
1650         },
1651         {0, 1, 2, 0,            /* 0xe2 */
1652                 {{1, 1},
1653                 {5, 7},
1654                 {0, 0},
1655                 {0, 0}
1656                 }
1657         },
1658         {1, 1, 2, 0,            /* 0xe3 */
1659                 {{0, 1},
1660                 {5, 7},
1661                 {0, 0},
1662                 {0, 0}
1663                 }
1664         },
1665         {0, 1, 2, 0,            /* 0xe4 */
1666                 {{2, 2},
1667                 {5, 7},
1668                 {0, 0},
1669                 {0, 0}
1670                 }
1671         },
1672         {1, 1, 3, 0,            /* 0xe5 */
1673                 {{0, 0},
1674                 {2, 2},
1675                 {5, 7},
1676                 {0, 0}
1677                 }
1678         },
1679         {0, 1, 2, 0,            /* 0xe6 */
1680                 {{1, 2},
1681                 {5, 7},
1682                 {0, 0},
1683                 {0, 0}
1684                 }
1685         },
1686         {1, 1, 2, 0,            /* 0xe7 */
1687                 {{0, 2},
1688                 {5, 7},
1689                 {0, 0},
1690                 {0, 0}
1691                 }
1692         },
1693         {0, 1, 2, 0,            /* 0xe8 */
1694                 {{3, 3},
1695                 {5, 7},
1696                 {0, 0},
1697                 {0, 0}
1698                 }
1699         },
1700         {1, 1, 3, 0,            /* 0xe9 */
1701                 {{0, 0},
1702                 {3, 3},
1703                 {5, 7},
1704                 {0, 0}
1705                 }
1706         },
1707         {0, 1, 3, 0,            /* 0xea */
1708                 {{1, 1},
1709                 {3, 3},
1710                 {5, 7},
1711                 {0, 0}
1712                 }
1713         },
1714         {1, 1, 3, 0,            /* 0xeb */
1715                 {{0, 1},
1716                 {3, 3},
1717                 {5, 7},
1718                 {0, 0}
1719                 }
1720         },
1721         {0, 1, 2, 0,            /* 0xec */
1722                 {{2, 3},
1723                 {5, 7},
1724                 {0, 0},
1725                 {0, 0}
1726                 }
1727         },
1728         {1, 1, 3, 0,            /* 0xed */
1729                 {{0, 0},
1730                 {2, 3},
1731                 {5, 7},
1732                 {0, 0}
1733                 }
1734         },
1735         {0, 1, 2, 0,            /* 0xee */
1736                 {{1, 3},
1737                 {5, 7},
1738                 {0, 0},
1739                 {0, 0}
1740                 }
1741         },
1742         {1, 1, 2, 0,            /* 0xef */
1743                 {{0, 3},
1744                 {5, 7},
1745                 {0, 0},
1746                 {0, 0}
1747                 }
1748         },
1749         {0, 1, 1, 0,            /* 0xf0 */
1750                 {{4, 7},
1751                 {0, 0},
1752                 {0, 0},
1753                 {0, 0}
1754                 }
1755         },
1756         {1, 1, 2, 0,            /* 0xf1 */
1757                 {{0, 0},
1758                 {4, 7},
1759                 {0, 0},
1760                 {0, 0}
1761                 }
1762         },
1763         {0, 1, 2, 0,            /* 0xf2 */
1764                 {{1, 1},
1765                 {4, 7},
1766                 {0, 0},
1767                 {0, 0}
1768                 }
1769         },
1770         {1, 1, 2, 0,            /* 0xf3 */
1771                 {{0, 1},
1772                 {4, 7},
1773                 {0, 0},
1774                 {0, 0}
1775                 }
1776         },
1777         {0, 1, 2, 0,            /* 0xf4 */
1778                 {{2, 2},
1779                 {4, 7},
1780                 {0, 0},
1781                 {0, 0}
1782                 }
1783         },
1784         {1, 1, 3, 0,            /* 0xf5 */
1785                 {{0, 0},
1786                 {2, 2},
1787                 {4, 7},
1788                 {0, 0}
1789                 }
1790         },
1791         {0, 1, 2, 0,            /* 0xf6 */
1792                 {{1, 2},
1793                 {4, 7},
1794                 {0, 0},
1795                 {0, 0}
1796                 }
1797         },
1798         {1, 1, 2, 0,            /* 0xf7 */
1799                 {{0, 2},
1800                 {4, 7},
1801                 {0, 0},
1802                 {0, 0}
1803                 }
1804         },
1805         {0, 1, 1, 0,            /* 0xf8 */
1806                 {{3, 7},
1807                 {0, 0},
1808                 {0, 0},
1809                 {0, 0}
1810                 }
1811         },
1812         {1, 1, 2, 0,            /* 0xf9 */
1813                 {{0, 0},
1814                 {3, 7},
1815                 {0, 0},
1816                 {0, 0}
1817                 }
1818         },
1819         {0, 1, 2, 0,            /* 0xfa */
1820                 {{1, 1},
1821                 {3, 7},
1822                 {0, 0},
1823                 {0, 0}
1824                 }
1825         },
1826         {1, 1, 2, 0,            /* 0xfb */
1827                 {{0, 1},
1828                 {3, 7},
1829                 {0, 0},
1830                 {0, 0}
1831                 }
1832         },
1833         {0, 1, 1, 0,            /* 0xfc */
1834                 {{2, 7},
1835                 {0, 0},
1836                 {0, 0},
1837                 {0, 0}
1838                 }
1839         },
1840         {1, 1, 2, 0,            /* 0xfd */
1841                 {{0, 0},
1842                 {2, 7},
1843                 {0, 0},
1844                 {0, 0}
1845                 }
1846         },
1847         {0, 1, 1, 0,            /* 0xfe */
1848                 {{1, 7},
1849                 {0, 0},
1850                 {0, 0},
1851                 {0, 0}
1852                 }
1853         },
1854         {1, 1, 1, 0,            /* 0xff */
1855                 {{0, 7},
1856                 {0, 0},
1857                 {0, 0},
1858                 {0, 0}
1859                 }
1860         }
1861 };
1862
1863
1864 int
1865 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1866     int ipv4_addr_legal,
1867     int ipv6_addr_legal,
1868     int loopback_scope,
1869     int ipv4_local_scope,
1870     int local_scope SCTP_UNUSED,/* XXX */
1871     int site_scope,
1872     int do_update)
1873 {
1874         if ((loopback_scope == 0) &&
1875             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876                 /*
1877                  * skip loopback if not in scope *
1878                  */
1879                 return (0);
1880         }
1881         switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883         case AF_INET:
1884                 if (ipv4_addr_legal) {
1885                         struct sockaddr_in *sin;
1886
1887                         sin = (struct sockaddr_in *)&ifa->address.sin;
1888                         if (sin->sin_addr.s_addr == 0) {
1889                                 /* not in scope , unspecified */
1890                                 return (0);
1891                         }
1892                         if ((ipv4_local_scope == 0) &&
1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894                                 /* private address not in scope */
1895                                 return (0);
1896                         }
1897                 } else {
1898                         return (0);
1899                 }
1900                 break;
1901 #endif
1902 #ifdef INET6
1903         case AF_INET6:
1904                 if (ipv6_addr_legal) {
1905                         struct sockaddr_in6 *sin6;
1906
1907                         /*
1908                          * Must update the flags,  bummer, which means any
1909                          * IFA locks must now be applied HERE <->
1910                          */
1911                         if (do_update) {
1912                                 sctp_gather_internal_ifa_flags(ifa);
1913                         }
1914                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915                                 return (0);
1916                         }
1917                         /* ok to use deprecated addresses? */
1918                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1919                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920                                 /* skip unspecifed addresses */
1921                                 return (0);
1922                         }
1923                         if (    /* (local_scope == 0) && */
1924                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925                                 return (0);
1926                         }
1927                         if ((site_scope == 0) &&
1928                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929                                 return (0);
1930                         }
1931                 } else {
1932                         return (0);
1933                 }
1934                 break;
1935 #endif
1936         default:
1937                 return (0);
1938         }
1939         return (1);
1940 }
1941
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1944 {
1945         struct sctp_paramhdr *parmh;
1946         struct mbuf *mret;
1947         int len;
1948
1949         switch (ifa->address.sa.sa_family) {
1950 #ifdef INET
1951         case AF_INET:
1952                 len = sizeof(struct sctp_ipv4addr_param);
1953                 break;
1954 #endif
1955 #ifdef INET6
1956         case AF_INET6:
1957                 len = sizeof(struct sctp_ipv6addr_param);
1958                 break;
1959 #endif
1960         default:
1961                 return (m);
1962         }
1963         if (M_TRAILINGSPACE(m) >= len) {
1964                 /* easy side we just drop it on the end */
1965                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 parmh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = (struct sockaddr_in *)&ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1991                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         parmh->param_length = htons(len);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += len;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2006                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         parmh->param_length = htons(len);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += len;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         return (mret);
2020 }
2021
2022
2023 struct mbuf *
2024 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2025     struct sctp_scoping *scope,
2026     struct mbuf *m_at, int cnt_inits_to)
2027 {
2028         struct sctp_vrf *vrf = NULL;
2029         int cnt, limit_out = 0, total_count;
2030         uint32_t vrf_id;
2031
2032         vrf_id = inp->def_vrf_id;
2033         SCTP_IPI_ADDR_RLOCK();
2034         vrf = sctp_find_vrf(vrf_id);
2035         if (vrf == NULL) {
2036                 SCTP_IPI_ADDR_RUNLOCK();
2037                 return (m_at);
2038         }
2039         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2040                 struct sctp_ifa *sctp_ifap;
2041                 struct sctp_ifn *sctp_ifnp;
2042
2043                 cnt = cnt_inits_to;
2044                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2045                         limit_out = 1;
2046                         cnt = SCTP_ADDRESS_LIMIT;
2047                         goto skip_count;
2048                 }
2049                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2050                         if ((scope->loopback_scope == 0) &&
2051                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2052                                 /*
2053                                  * Skip loopback devices if loopback_scope
2054                                  * not set
2055                                  */
2056                                 continue;
2057                         }
2058                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2059                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2060                                         continue;
2061                                 }
2062                                 if (sctp_is_address_in_scope(sctp_ifap,
2063                                     scope->ipv4_addr_legal,
2064                                     scope->ipv6_addr_legal,
2065                                     scope->loopback_scope,
2066                                     scope->ipv4_local_scope,
2067                                     scope->local_scope,
2068                                     scope->site_scope, 1) == 0) {
2069                                         continue;
2070                                 }
2071                                 cnt++;
2072                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2073                                         break;
2074                                 }
2075                         }
2076                         if (cnt > SCTP_ADDRESS_LIMIT) {
2077                                 break;
2078                         }
2079                 }
2080 skip_count:
2081                 if (cnt > 1) {
2082                         total_count = 0;
2083                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2084                                 cnt = 0;
2085                                 if ((scope->loopback_scope == 0) &&
2086                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2087                                         /*
2088                                          * Skip loopback devices if
2089                                          * loopback_scope not set
2090                                          */
2091                                         continue;
2092                                 }
2093                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2094                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2095                                                 continue;
2096                                         }
2097                                         if (sctp_is_address_in_scope(sctp_ifap,
2098                                             scope->ipv4_addr_legal,
2099                                             scope->ipv6_addr_legal,
2100                                             scope->loopback_scope,
2101                                             scope->ipv4_local_scope,
2102                                             scope->local_scope,
2103                                             scope->site_scope, 0) == 0) {
2104                                                 continue;
2105                                         }
2106                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2107                                         if (limit_out) {
2108                                                 cnt++;
2109                                                 total_count++;
2110                                                 if (cnt >= 2) {
2111                                                         /*
2112                                                          * two from each
2113                                                          * address
2114                                                          */
2115                                                         break;
2116                                                 }
2117                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2118                                                         /* No more addresses */
2119                                                         break;
2120                                                 }
2121                                         }
2122                                 }
2123                         }
2124                 }
2125         } else {
2126                 struct sctp_laddr *laddr;
2127
2128                 cnt = cnt_inits_to;
2129                 /* First, how many ? */
2130                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2131                         if (laddr->ifa == NULL) {
2132                                 continue;
2133                         }
2134                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2135                                 /*
2136                                  * Address being deleted by the system, dont
2137                                  * list.
2138                                  */
2139                                 continue;
2140                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2141                                 /*
2142                                  * Address being deleted on this ep don't
2143                                  * list.
2144                                  */
2145                                 continue;
2146                         }
2147                         if (sctp_is_address_in_scope(laddr->ifa,
2148                             scope->ipv4_addr_legal,
2149                             scope->ipv6_addr_legal,
2150                             scope->loopback_scope,
2151                             scope->ipv4_local_scope,
2152                             scope->local_scope,
2153                             scope->site_scope, 1) == 0) {
2154                                 continue;
2155                         }
2156                         cnt++;
2157                 }
2158                 /*
2159                  * To get through a NAT we only list addresses if we have
2160                  * more than one. That way if you just bind a single address
2161                  * we let the source of the init dictate our address.
2162                  */
2163                 if (cnt > 1) {
2164                         cnt = cnt_inits_to;
2165                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2166                                 if (laddr->ifa == NULL) {
2167                                         continue;
2168                                 }
2169                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2170                                         continue;
2171                                 }
2172                                 if (sctp_is_address_in_scope(laddr->ifa,
2173                                     scope->ipv4_addr_legal,
2174                                     scope->ipv6_addr_legal,
2175                                     scope->loopback_scope,
2176                                     scope->ipv4_local_scope,
2177                                     scope->local_scope,
2178                                     scope->site_scope, 0) == 0) {
2179                                         continue;
2180                                 }
2181                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2182                                 cnt++;
2183                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2184                                         break;
2185                                 }
2186                         }
2187                 }
2188         }
2189         SCTP_IPI_ADDR_RUNLOCK();
2190         return (m_at);
2191 }
2192
2193 static struct sctp_ifa *
2194 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2195     uint8_t dest_is_loop,
2196     uint8_t dest_is_priv,
2197     sa_family_t fam)
2198 {
2199         uint8_t dest_is_global = 0;
2200
2201         /* dest_is_priv is true if destination is a private address */
2202         /* dest_is_loop is true if destination is a loopback addresses */
2203
2204         /**
2205          * Here we determine if its a preferred address. A preferred address
2206          * means it is the same scope or higher scope then the destination.
2207          * L = loopback, P = private, G = global
2208          * -----------------------------------------
2209          *    src    |  dest | result
2210          *  ----------------------------------------
2211          *     L     |    L  |    yes
2212          *  -----------------------------------------
2213          *     P     |    L  |    yes-v4 no-v6
2214          *  -----------------------------------------
2215          *     G     |    L  |    yes-v4 no-v6
2216          *  -----------------------------------------
2217          *     L     |    P  |    no
2218          *  -----------------------------------------
2219          *     P     |    P  |    yes
2220          *  -----------------------------------------
2221          *     G     |    P  |    no
2222          *   -----------------------------------------
2223          *     L     |    G  |    no
2224          *   -----------------------------------------
2225          *     P     |    G  |    no
2226          *    -----------------------------------------
2227          *     G     |    G  |    yes
2228          *    -----------------------------------------
2229          */
2230
2231         if (ifa->address.sa.sa_family != fam) {
2232                 /* forget mis-matched family */
2233                 return (NULL);
2234         }
2235         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2236                 dest_is_global = 1;
2237         }
2238         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2239         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2240         /* Ok the address may be ok */
2241 #ifdef INET6
2242         if (fam == AF_INET6) {
2243                 /* ok to use deprecated addresses? no lets not! */
2244                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2245                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2246                         return (NULL);
2247                 }
2248                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2249                         if (dest_is_loop) {
2250                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2251                                 return (NULL);
2252                         }
2253                 }
2254                 if (ifa->src_is_glob) {
2255                         if (dest_is_loop) {
2256                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2257                                 return (NULL);
2258                         }
2259                 }
2260         }
2261 #endif
2262         /*
2263          * Now that we know what is what, implement or table this could in
2264          * theory be done slicker (it used to be), but this is
2265          * straightforward and easier to validate :-)
2266          */
2267         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2268             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2269         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2270             dest_is_loop, dest_is_priv, dest_is_global);
2271
2272         if ((ifa->src_is_loop) && (dest_is_priv)) {
2273                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2274                 return (NULL);
2275         }
2276         if ((ifa->src_is_glob) && (dest_is_priv)) {
2277                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2278                 return (NULL);
2279         }
2280         if ((ifa->src_is_loop) && (dest_is_global)) {
2281                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2282                 return (NULL);
2283         }
2284         if ((ifa->src_is_priv) && (dest_is_global)) {
2285                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2286                 return (NULL);
2287         }
2288         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2289         /* its a preferred address */
2290         return (ifa);
2291 }
2292
2293 static struct sctp_ifa *
2294 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2295     uint8_t dest_is_loop,
2296     uint8_t dest_is_priv,
2297     sa_family_t fam)
2298 {
2299         uint8_t dest_is_global = 0;
2300
2301         /**
2302          * Here we determine if its a acceptable address. A acceptable
2303          * address means it is the same scope or higher scope but we can
2304          * allow for NAT which means its ok to have a global dest and a
2305          * private src.
2306          *
2307          * L = loopback, P = private, G = global
2308          * -----------------------------------------
2309          *  src    |  dest | result
2310          * -----------------------------------------
2311          *   L     |   L   |    yes
2312          *  -----------------------------------------
2313          *   P     |   L   |    yes-v4 no-v6
2314          *  -----------------------------------------
2315          *   G     |   L   |    yes
2316          * -----------------------------------------
2317          *   L     |   P   |    no
2318          * -----------------------------------------
2319          *   P     |   P   |    yes
2320          * -----------------------------------------
2321          *   G     |   P   |    yes - May not work
2322          * -----------------------------------------
2323          *   L     |   G   |    no
2324          * -----------------------------------------
2325          *   P     |   G   |    yes - May not work
2326          * -----------------------------------------
2327          *   G     |   G   |    yes
2328          * -----------------------------------------
2329          */
2330
2331         if (ifa->address.sa.sa_family != fam) {
2332                 /* forget non matching family */
2333                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2334                     ifa->address.sa.sa_family, fam);
2335                 return (NULL);
2336         }
2337         /* Ok the address may be ok */
2338         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2339         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2340             dest_is_loop, dest_is_priv);
2341         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2342                 dest_is_global = 1;
2343         }
2344 #ifdef INET6
2345         if (fam == AF_INET6) {
2346                 /* ok to use deprecated addresses? */
2347                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2348                         return (NULL);
2349                 }
2350                 if (ifa->src_is_priv) {
2351                         /* Special case, linklocal to loop */
2352                         if (dest_is_loop)
2353                                 return (NULL);
2354                 }
2355         }
2356 #endif
2357         /*
2358          * Now that we know what is what, implement our table. This could in
2359          * theory be done slicker (it used to be), but this is
2360          * straightforward and easier to validate :-)
2361          */
2362         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2363             ifa->src_is_loop,
2364             dest_is_priv);
2365         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2366                 return (NULL);
2367         }
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2369             ifa->src_is_loop,
2370             dest_is_global);
2371         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2372                 return (NULL);
2373         }
2374         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2375         /* its an acceptable address */
2376         return (ifa);
2377 }
2378
2379 int
2380 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2381 {
2382         struct sctp_laddr *laddr;
2383
2384         if (stcb == NULL) {
2385                 /* There are no restrictions, no TCB :-) */
2386                 return (0);
2387         }
2388         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2389                 if (laddr->ifa == NULL) {
2390                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2391                             __FUNCTION__);
2392                         continue;
2393                 }
2394                 if (laddr->ifa == ifa) {
2395                         /* Yes it is on the list */
2396                         return (1);
2397                 }
2398         }
2399         return (0);
2400 }
2401
2402
2403 int
2404 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2405 {
2406         struct sctp_laddr *laddr;
2407
2408         if (ifa == NULL)
2409                 return (0);
2410         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2411                 if (laddr->ifa == NULL) {
2412                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2413                             __FUNCTION__);
2414                         continue;
2415                 }
2416                 if ((laddr->ifa == ifa) && laddr->action == 0)
2417                         /* same pointer */
2418                         return (1);
2419         }
2420         return (0);
2421 }
2422
2423
2424
2425 static struct sctp_ifa *
2426 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2427     sctp_route_t * ro,
2428     uint32_t vrf_id,
2429     int non_asoc_addr_ok,
2430     uint8_t dest_is_priv,
2431     uint8_t dest_is_loop,
2432     sa_family_t fam)
2433 {
2434         struct sctp_laddr *laddr, *starting_point;
2435         void *ifn;
2436         int resettotop = 0;
2437         struct sctp_ifn *sctp_ifn;
2438         struct sctp_ifa *sctp_ifa, *sifa;
2439         struct sctp_vrf *vrf;
2440         uint32_t ifn_index;
2441
2442         vrf = sctp_find_vrf(vrf_id);
2443         if (vrf == NULL)
2444                 return (NULL);
2445
2446         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2447         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2448         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2449         /*
2450          * first question, is the ifn we will emit on in our list, if so, we
2451          * want such an address. Note that we first looked for a preferred
2452          * address.
2453          */
2454         if (sctp_ifn) {
2455                 /* is a preferred one on the interface we route out? */
2456                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2457                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2458                             (non_asoc_addr_ok == 0))
2459                                 continue;
2460                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2461                             dest_is_loop,
2462                             dest_is_priv, fam);
2463                         if (sifa == NULL)
2464                                 continue;
2465                         if (sctp_is_addr_in_ep(inp, sifa)) {
2466                                 atomic_add_int(&sifa->refcount, 1);
2467                                 return (sifa);
2468                         }
2469                 }
2470         }
2471         /*
2472          * ok, now we now need to find one on the list of the addresses. We
2473          * can't get one on the emitting interface so let's find first a
2474          * preferred one. If not that an acceptable one otherwise... we
2475          * return NULL.
2476          */
2477         starting_point = inp->next_addr_touse;
2478 once_again:
2479         if (inp->next_addr_touse == NULL) {
2480                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2481                 resettotop = 1;
2482         }
2483         for (laddr = inp->next_addr_touse; laddr;
2484             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2485                 if (laddr->ifa == NULL) {
2486                         /* address has been removed */
2487                         continue;
2488                 }
2489                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2490                         /* address is being deleted */
2491                         continue;
2492                 }
2493                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2494                     dest_is_priv, fam);
2495                 if (sifa == NULL)
2496                         continue;
2497                 atomic_add_int(&sifa->refcount, 1);
2498                 return (sifa);
2499         }
2500         if (resettotop == 0) {
2501                 inp->next_addr_touse = NULL;
2502                 goto once_again;
2503         }
2504         inp->next_addr_touse = starting_point;
2505         resettotop = 0;
2506 once_again_too:
2507         if (inp->next_addr_touse == NULL) {
2508                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2509                 resettotop = 1;
2510         }
2511         /* ok, what about an acceptable address in the inp */
2512         for (laddr = inp->next_addr_touse; laddr;
2513             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2514                 if (laddr->ifa == NULL) {
2515                         /* address has been removed */
2516                         continue;
2517                 }
2518                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2519                         /* address is being deleted */
2520                         continue;
2521                 }
2522                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2523                     dest_is_priv, fam);
2524                 if (sifa == NULL)
2525                         continue;
2526                 atomic_add_int(&sifa->refcount, 1);
2527                 return (sifa);
2528         }
2529         if (resettotop == 0) {
2530                 inp->next_addr_touse = NULL;
2531                 goto once_again_too;
2532         }
2533         /*
2534          * no address bound can be a source for the destination we are in
2535          * trouble
2536          */
2537         return (NULL);
2538 }
2539
2540
2541
2542 static struct sctp_ifa *
2543 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2544     struct sctp_tcb *stcb,
2545     sctp_route_t * ro,
2546     uint32_t vrf_id,
2547     uint8_t dest_is_priv,
2548     uint8_t dest_is_loop,
2549     int non_asoc_addr_ok,
2550     sa_family_t fam)
2551 {
2552         struct sctp_laddr *laddr, *starting_point;
2553         void *ifn;
2554         struct sctp_ifn *sctp_ifn;
2555         struct sctp_ifa *sctp_ifa, *sifa;
2556         uint8_t start_at_beginning = 0;
2557         struct sctp_vrf *vrf;
2558         uint32_t ifn_index;
2559
2560         /*
2561          * first question, is the ifn we will emit on in our list, if so, we
2562          * want that one.
2563          */
2564         vrf = sctp_find_vrf(vrf_id);
2565         if (vrf == NULL)
2566                 return (NULL);
2567
2568         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2569         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2570         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2571
2572         /*
2573          * first question, is the ifn we will emit on in our list?  If so,
2574          * we want that one. First we look for a preferred. Second, we go
2575          * for an acceptable.
2576          */
2577         if (sctp_ifn) {
2578                 /* first try for a preferred address on the ep */
2579                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2580                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2581                                 continue;
2582                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2583                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2584                                 if (sifa == NULL)
2585                                         continue;
2586                                 if (((non_asoc_addr_ok == 0) &&
2587                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2588                                     (non_asoc_addr_ok &&
2589                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2590                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2591                                         /* on the no-no list */
2592                                         continue;
2593                                 }
2594                                 atomic_add_int(&sifa->refcount, 1);
2595                                 return (sifa);
2596                         }
2597                 }
2598                 /* next try for an acceptable address on the ep */
2599                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2600                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2601                                 continue;
2602                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2603                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2604                                 if (sifa == NULL)
2605                                         continue;
2606                                 if (((non_asoc_addr_ok == 0) &&
2607                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2608                                     (non_asoc_addr_ok &&
2609                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2610                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2611                                         /* on the no-no list */
2612                                         continue;
2613                                 }
2614                                 atomic_add_int(&sifa->refcount, 1);
2615                                 return (sifa);
2616                         }
2617                 }
2618
2619         }
2620         /*
2621          * if we can't find one like that then we must look at all addresses
2622          * bound to pick one at first preferable then secondly acceptable.
2623          */
2624         starting_point = stcb->asoc.last_used_address;
2625 sctp_from_the_top:
2626         if (stcb->asoc.last_used_address == NULL) {
2627                 start_at_beginning = 1;
2628                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2629         }
2630         /* search beginning with the last used address */
2631         for (laddr = stcb->asoc.last_used_address; laddr;
2632             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2633                 if (laddr->ifa == NULL) {
2634                         /* address has been removed */
2635                         continue;
2636                 }
2637                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2638                         /* address is being deleted */
2639                         continue;
2640                 }
2641                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2642                 if (sifa == NULL)
2643                         continue;
2644                 if (((non_asoc_addr_ok == 0) &&
2645                     (sctp_is_addr_restricted(stcb, sifa))) ||
2646                     (non_asoc_addr_ok &&
2647                     (sctp_is_addr_restricted(stcb, sifa)) &&
2648                     (!sctp_is_addr_pending(stcb, sifa)))) {
2649                         /* on the no-no list */
2650                         continue;
2651                 }
2652                 stcb->asoc.last_used_address = laddr;
2653                 atomic_add_int(&sifa->refcount, 1);
2654                 return (sifa);
2655         }
2656         if (start_at_beginning == 0) {
2657                 stcb->asoc.last_used_address = NULL;
2658                 goto sctp_from_the_top;
2659         }
2660         /* now try for any higher scope than the destination */
2661         stcb->asoc.last_used_address = starting_point;
2662         start_at_beginning = 0;
2663 sctp_from_the_top2:
2664         if (stcb->asoc.last_used_address == NULL) {
2665                 start_at_beginning = 1;
2666                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2667         }
2668         /* search beginning with the last used address */
2669         for (laddr = stcb->asoc.last_used_address; laddr;
2670             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2671                 if (laddr->ifa == NULL) {
2672                         /* address has been removed */
2673                         continue;
2674                 }
2675                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2676                         /* address is being deleted */
2677                         continue;
2678                 }
2679                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2680                     dest_is_priv, fam);
2681                 if (sifa == NULL)
2682                         continue;
2683                 if (((non_asoc_addr_ok == 0) &&
2684                     (sctp_is_addr_restricted(stcb, sifa))) ||
2685                     (non_asoc_addr_ok &&
2686                     (sctp_is_addr_restricted(stcb, sifa)) &&
2687                     (!sctp_is_addr_pending(stcb, sifa)))) {
2688                         /* on the no-no list */
2689                         continue;
2690                 }
2691                 stcb->asoc.last_used_address = laddr;
2692                 atomic_add_int(&sifa->refcount, 1);
2693                 return (sifa);
2694         }
2695         if (start_at_beginning == 0) {
2696                 stcb->asoc.last_used_address = NULL;
2697                 goto sctp_from_the_top2;
2698         }
2699         return (NULL);
2700 }
2701
2702 static struct sctp_ifa *
2703 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2704     struct sctp_tcb *stcb,
2705     int non_asoc_addr_ok,
2706     uint8_t dest_is_loop,
2707     uint8_t dest_is_priv,
2708     int addr_wanted,
2709     sa_family_t fam,
2710     sctp_route_t * ro
2711 )
2712 {
2713         struct sctp_ifa *ifa, *sifa;
2714         int num_eligible_addr = 0;
2715
2716 #ifdef INET6
2717         struct sockaddr_in6 sin6, lsa6;
2718
2719         if (fam == AF_INET6) {
2720                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2721                 (void)sa6_recoverscope(&sin6);
2722         }
2723 #endif                          /* INET6 */
2724         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2725                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2726                     (non_asoc_addr_ok == 0))
2727                         continue;
2728                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2729                     dest_is_priv, fam);
2730                 if (sifa == NULL)
2731                         continue;
2732 #ifdef INET6
2733                 if (fam == AF_INET6 &&
2734                     dest_is_loop &&
2735                     sifa->src_is_loop && sifa->src_is_priv) {
2736                         /*
2737                          * don't allow fe80::1 to be a src on loop ::1, we
2738                          * don't list it to the peer so we will get an
2739                          * abort.
2740                          */
2741                         continue;
2742                 }
2743                 if (fam == AF_INET6 &&
2744                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2745                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2746                         /*
2747                          * link-local <-> link-local must belong to the same
2748                          * scope.
2749                          */
2750                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2751                         (void)sa6_recoverscope(&lsa6);
2752                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2753                                 continue;
2754                         }
2755                 }
2756 #endif                          /* INET6 */
2757
2758                 /*
2759                  * Check if the IPv6 address matches to next-hop. In the
2760                  * mobile case, old IPv6 address may be not deleted from the
2761                  * interface. Then, the interface has previous and new
2762                  * addresses.  We should use one corresponding to the
2763                  * next-hop.  (by micchie)
2764                  */
2765 #ifdef INET6
2766                 if (stcb && fam == AF_INET6 &&
2767                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2768                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2769                             == 0) {
2770                                 continue;
2771                         }
2772                 }
2773 #endif
2774 #ifdef INET
2775                 /* Avoid topologically incorrect IPv4 address */
2776                 if (stcb && fam == AF_INET &&
2777                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2778                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2779                                 continue;
2780                         }
2781                 }
2782 #endif
2783                 if (stcb) {
2784                         if (sctp_is_address_in_scope(ifa,
2785                             stcb->asoc.ipv4_addr_legal,
2786                             stcb->asoc.ipv6_addr_legal,
2787                             stcb->asoc.loopback_scope,
2788                             stcb->asoc.ipv4_local_scope,
2789                             stcb->asoc.local_scope,
2790                             stcb->asoc.site_scope, 0) == 0) {
2791                                 continue;
2792                         }
2793                         if (((non_asoc_addr_ok == 0) &&
2794                             (sctp_is_addr_restricted(stcb, sifa))) ||
2795                             (non_asoc_addr_ok &&
2796                             (sctp_is_addr_restricted(stcb, sifa)) &&
2797                             (!sctp_is_addr_pending(stcb, sifa)))) {
2798                                 /*
2799                                  * It is restricted for some reason..
2800                                  * probably not yet added.
2801                                  */
2802                                 continue;
2803                         }
2804                 }
2805                 if (num_eligible_addr >= addr_wanted) {
2806                         return (sifa);
2807                 }
2808                 num_eligible_addr++;
2809         }
2810         return (NULL);
2811 }
2812
2813
2814 static int
2815 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2816     struct sctp_tcb *stcb,
2817     int non_asoc_addr_ok,
2818     uint8_t dest_is_loop,
2819     uint8_t dest_is_priv,
2820     sa_family_t fam)
2821 {
2822         struct sctp_ifa *ifa, *sifa;
2823         int num_eligible_addr = 0;
2824
2825         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2826                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2827                     (non_asoc_addr_ok == 0)) {
2828                         continue;
2829                 }
2830                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2831                     dest_is_priv, fam);
2832                 if (sifa == NULL) {
2833                         continue;
2834                 }
2835                 if (stcb) {
2836                         if (sctp_is_address_in_scope(ifa,
2837                             stcb->asoc.ipv4_addr_legal,
2838                             stcb->asoc.ipv6_addr_legal,
2839                             stcb->asoc.loopback_scope,
2840                             stcb->asoc.ipv4_local_scope,
2841                             stcb->asoc.local_scope,
2842                             stcb->asoc.site_scope, 0) == 0) {
2843                                 continue;
2844                         }
2845                         if (((non_asoc_addr_ok == 0) &&
2846                             (sctp_is_addr_restricted(stcb, sifa))) ||
2847                             (non_asoc_addr_ok &&
2848                             (sctp_is_addr_restricted(stcb, sifa)) &&
2849                             (!sctp_is_addr_pending(stcb, sifa)))) {
2850                                 /*
2851                                  * It is restricted for some reason..
2852                                  * probably not yet added.
2853                                  */
2854                                 continue;
2855                         }
2856                 }
2857                 num_eligible_addr++;
2858         }
2859         return (num_eligible_addr);
2860 }
2861
2862 static struct sctp_ifa *
2863 sctp_choose_boundall(struct sctp_tcb *stcb,
2864     struct sctp_nets *net,
2865     sctp_route_t * ro,
2866     uint32_t vrf_id,
2867     uint8_t dest_is_priv,
2868     uint8_t dest_is_loop,
2869     int non_asoc_addr_ok,
2870     sa_family_t fam)
2871 {
2872         int cur_addr_num = 0, num_preferred = 0;
2873         void *ifn;
2874         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2875         struct sctp_ifa *sctp_ifa, *sifa;
2876         uint32_t ifn_index;
2877         struct sctp_vrf *vrf;
2878
2879 #ifdef INET
2880         int retried = 0;
2881
2882 #endif
2883
2884         /*-
2885          * For boundall we can use any address in the association.
2886          * If non_asoc_addr_ok is set we can use any address (at least in
2887          * theory). So we look for preferred addresses first. If we find one,
2888          * we use it. Otherwise we next try to get an address on the
2889          * interface, which we should be able to do (unless non_asoc_addr_ok
2890          * is false and we are routed out that way). In these cases where we
2891          * can't use the address of the interface we go through all the
2892          * ifn's looking for an address we can use and fill that in. Punting
2893          * means we send back address 0, which will probably cause problems
2894          * actually since then IP will fill in the address of the route ifn,
2895          * which means we probably already rejected it.. i.e. here comes an
2896          * abort :-<.
2897          */
2898         vrf = sctp_find_vrf(vrf_id);
2899         if (vrf == NULL)
2900                 return (NULL);
2901
2902         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2903         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2904         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2905         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2906         if (sctp_ifn == NULL) {
2907                 /* ?? We don't have this guy ?? */
2908                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2909                 goto bound_all_plan_b;
2910         }
2911         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2912             ifn_index, sctp_ifn->ifn_name);
2913
2914         if (net) {
2915                 cur_addr_num = net->indx_of_eligible_next_to_use;
2916         }
2917         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2918             stcb,
2919             non_asoc_addr_ok,
2920             dest_is_loop,
2921             dest_is_priv, fam);
2922         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2923             num_preferred, sctp_ifn->ifn_name);
2924         if (num_preferred == 0) {
2925                 /*
2926                  * no eligible addresses, we must use some other interface
2927                  * address if we can find one.
2928                  */
2929                 goto bound_all_plan_b;
2930         }
2931         /*
2932          * Ok we have num_eligible_addr set with how many we can use, this
2933          * may vary from call to call due to addresses being deprecated
2934          * etc..
2935          */
2936         if (cur_addr_num >= num_preferred) {
2937                 cur_addr_num = 0;
2938         }
2939         /*
2940          * select the nth address from the list (where cur_addr_num is the
2941          * nth) and 0 is the first one, 1 is the second one etc...
2942          */
2943         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2944
2945         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2946             dest_is_priv, cur_addr_num, fam, ro);
2947
2948         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2949         if (sctp_ifa) {
2950                 atomic_add_int(&sctp_ifa->refcount, 1);
2951                 if (net) {
2952                         /* save off where the next one we will want */
2953                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2954                 }
2955                 return (sctp_ifa);
2956         }
2957         /*
2958          * plan_b: Look at all interfaces and find a preferred address. If
2959          * no preferred fall through to plan_c.
2960          */
2961 bound_all_plan_b:
2962         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2963         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2964                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2965                     sctp_ifn->ifn_name);
2966                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2967                         /* wrong base scope */
2968                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2969                         continue;
2970                 }
2971                 if ((sctp_ifn == looked_at) && looked_at) {
2972                         /* already looked at this guy */
2973                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2974                         continue;
2975                 }
2976                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2977                     dest_is_loop, dest_is_priv, fam);
2978                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2979                     "Found ifn:%p %d preferred source addresses\n",
2980                     ifn, num_preferred);
2981                 if (num_preferred == 0) {
2982                         /* None on this interface. */
2983                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2984                         continue;
2985                 }
2986                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2987                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2988                     num_preferred, (void *)sctp_ifn, cur_addr_num);
2989
2990                 /*
2991                  * Ok we have num_eligible_addr set with how many we can
2992                  * use, this may vary from call to call due to addresses
2993                  * being deprecated etc..
2994                  */
2995                 if (cur_addr_num >= num_preferred) {
2996                         cur_addr_num = 0;
2997                 }
2998                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2999                     dest_is_priv, cur_addr_num, fam, ro);
3000                 if (sifa == NULL)
3001                         continue;
3002                 if (net) {
3003                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3004                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3005                             cur_addr_num);
3006                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3007                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3008                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3009                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3010                 }
3011                 atomic_add_int(&sifa->refcount, 1);
3012                 return (sifa);
3013         }
3014 #ifdef INET
3015 again_with_private_addresses_allowed:
3016 #endif
3017         /* plan_c: do we have an acceptable address on the emit interface */
3018         sifa = NULL;
3019         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3020         if (emit_ifn == NULL) {
3021                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3022                 goto plan_d;
3023         }
3024         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3025                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
3026                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3027                     (non_asoc_addr_ok == 0)) {
3028                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3029                         continue;
3030                 }
3031                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3032                     dest_is_priv, fam);
3033                 if (sifa == NULL) {
3034                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3035                         continue;
3036                 }
3037                 if (stcb) {
3038                         if (sctp_is_address_in_scope(sifa,
3039                             stcb->asoc.ipv4_addr_legal,
3040                             stcb->asoc.ipv6_addr_legal,
3041                             stcb->asoc.loopback_scope,
3042                             stcb->asoc.ipv4_local_scope,
3043                             stcb->asoc.local_scope,
3044                             stcb->asoc.site_scope, 0) == 0) {
3045                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3046                                 sifa = NULL;
3047                                 continue;
3048                         }
3049                         if (((non_asoc_addr_ok == 0) &&
3050                             (sctp_is_addr_restricted(stcb, sifa))) ||
3051                             (non_asoc_addr_ok &&
3052                             (sctp_is_addr_restricted(stcb, sifa)) &&
3053                             (!sctp_is_addr_pending(stcb, sifa)))) {
3054                                 /*
3055                                  * It is restricted for some reason..
3056                                  * probably not yet added.
3057                                  */
3058                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3059                                 sifa = NULL;
3060                                 continue;
3061                         }
3062                 } else {
3063                         SCTP_PRINTF("Stcb is null - no print\n");
3064                 }
3065                 atomic_add_int(&sifa->refcount, 1);
3066                 goto out;
3067         }
3068 plan_d:
3069         /*
3070          * plan_d: We are in trouble. No preferred address on the emit
3071          * interface. And not even a preferred address on all interfaces. Go
3072          * out and see if we can find an acceptable address somewhere
3073          * amongst all interfaces.
3074          */
3075         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
3076         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3077                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3078                         /* wrong base scope */
3079                         continue;
3080                 }
3081                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3082                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3083                             (non_asoc_addr_ok == 0))
3084                                 continue;
3085                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3086                             dest_is_loop,
3087                             dest_is_priv, fam);
3088                         if (sifa == NULL)
3089                                 continue;
3090                         if (stcb) {
3091                                 if (sctp_is_address_in_scope(sifa,
3092                                     stcb->asoc.ipv4_addr_legal,
3093                                     stcb->asoc.ipv6_addr_legal,
3094                                     stcb->asoc.loopback_scope,
3095                                     stcb->asoc.ipv4_local_scope,
3096                                     stcb->asoc.local_scope,
3097                                     stcb->asoc.site_scope, 0) == 0) {
3098                                         sifa = NULL;
3099                                         continue;
3100                                 }
3101                                 if (((non_asoc_addr_ok == 0) &&
3102                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3103                                     (non_asoc_addr_ok &&
3104                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3105                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3106                                         /*
3107                                          * It is restricted for some
3108                                          * reason.. probably not yet added.
3109                                          */
3110                                         sifa = NULL;
3111                                         continue;
3112                                 }
3113                         }
3114                         goto out;
3115                 }
3116         }
3117 #ifdef INET
3118         if ((retried == 0) && (stcb->asoc.ipv4_local_scope == 0)) {
3119                 stcb->asoc.ipv4_local_scope = 1;
3120                 retried = 1;
3121                 goto again_with_private_addresses_allowed;
3122         } else if (retried == 1) {
3123                 stcb->asoc.ipv4_local_scope = 0;
3124         }
3125 #endif
3126 out:
3127 #ifdef INET
3128         if (sifa) {
3129                 if (retried == 1) {
3130                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3131                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3132                                         /* wrong base scope */
3133                                         continue;
3134                                 }
3135                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3136                                         struct sctp_ifa *tmp_sifa;
3137
3138                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3139                                             (non_asoc_addr_ok == 0))
3140                                                 continue;
3141                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3142                                             dest_is_loop,
3143                                             dest_is_priv, fam);
3144                                         if (tmp_sifa == NULL) {
3145                                                 continue;
3146                                         }
3147                                         if (tmp_sifa == sifa) {
3148                                                 continue;
3149                                         }
3150                                         if (stcb) {
3151                                                 if (sctp_is_address_in_scope(tmp_sifa,
3152                                                     stcb->asoc.ipv4_addr_legal,
3153                                                     stcb->asoc.ipv6_addr_legal,
3154                                                     stcb->asoc.loopback_scope,
3155                                                     stcb->asoc.ipv4_local_scope,
3156                                                     stcb->asoc.local_scope,
3157                                                     stcb->asoc.site_scope, 0) == 0) {
3158                                                         continue;
3159                                                 }
3160                                                 if (((non_asoc_addr_ok == 0) &&
3161                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3162                                                     (non_asoc_addr_ok &&
3163                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3164                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3165                                                         /*
3166                                                          * It is restricted
3167                                                          * for some reason..
3168                                                          * probably not yet
3169                                                          * added.
3170                                                          */
3171                                                         continue;
3172                                                 }
3173                                         }
3174                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3175                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3176                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3177                                         }
3178                                 }
3179                         }
3180                 }
3181                 atomic_add_int(&sifa->refcount, 1);
3182         }
3183 #endif
3184         return (sifa);
3185 }
3186
3187
3188
3189 /* tcb may be NULL */
3190 struct sctp_ifa *
3191 sctp_source_address_selection(struct sctp_inpcb *inp,
3192     struct sctp_tcb *stcb,
3193     sctp_route_t * ro,
3194     struct sctp_nets *net,
3195     int non_asoc_addr_ok, uint32_t vrf_id)
3196 {
3197         struct sctp_ifa *answer;
3198         uint8_t dest_is_priv, dest_is_loop;
3199         sa_family_t fam;
3200
3201 #ifdef INET
3202         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3203
3204 #endif
3205 #ifdef INET6
3206         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3207
3208 #endif
3209
3210         /**
3211          * Rules: - Find the route if needed, cache if I can. - Look at
3212          * interface address in route, Is it in the bound list. If so we
3213          * have the best source. - If not we must rotate amongst the
3214          * addresses.
3215          *
3216          * Cavets and issues
3217          *
3218          * Do we need to pay attention to scope. We can have a private address
3219          * or a global address we are sourcing or sending to. So if we draw
3220          * it out
3221          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3222          * For V4
3223          * ------------------------------------------
3224          *      source     *      dest  *  result
3225          * -----------------------------------------
3226          * <a>  Private    *    Global  *  NAT
3227          * -----------------------------------------
3228          * <b>  Private    *    Private *  No problem
3229          * -----------------------------------------
3230          * <c>  Global     *    Private *  Huh, How will this work?
3231          * -----------------------------------------
3232          * <d>  Global     *    Global  *  No Problem
3233          *------------------------------------------
3234          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3235          * For V6
3236          *------------------------------------------
3237          *      source     *      dest  *  result
3238          * -----------------------------------------
3239          * <a>  Linklocal  *    Global  *
3240          * -----------------------------------------
3241          * <b>  Linklocal  * Linklocal  *  No problem
3242          * -----------------------------------------
3243          * <c>  Global     * Linklocal  *  Huh, How will this work?
3244          * -----------------------------------------
3245          * <d>  Global     *    Global  *  No Problem
3246          *------------------------------------------
3247          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3248          *
3249          * And then we add to that what happens if there are multiple addresses
3250          * assigned to an interface. Remember the ifa on a ifn is a linked
3251          * list of addresses. So one interface can have more than one IP
3252          * address. What happens if we have both a private and a global
3253          * address? Do we then use context of destination to sort out which
3254          * one is best? And what about NAT's sending P->G may get you a NAT
3255          * translation, or should you select the G thats on the interface in
3256          * preference.
3257          *
3258          * Decisions:
3259          *
3260          * - count the number of addresses on the interface.
3261          * - if it is one, no problem except case <c>.
3262          *   For <a> we will assume a NAT out there.
3263          * - if there are more than one, then we need to worry about scope P
3264          *   or G. We should prefer G -> G and P -> P if possible.
3265          *   Then as a secondary fall back to mixed types G->P being a last
3266          *   ditch one.
3267          * - The above all works for bound all, but bound specific we need to
3268          *   use the same concept but instead only consider the bound
3269          *   addresses. If the bound set is NOT assigned to the interface then
3270          *   we must use rotation amongst the bound addresses..
3271          */
3272         if (ro->ro_rt == NULL) {
3273                 /*
3274                  * Need a route to cache.
3275                  */
3276                 SCTP_RTALLOC(ro, vrf_id);
3277         }
3278         if (ro->ro_rt == NULL) {
3279                 return (NULL);
3280         }
3281         fam = ro->ro_dst.sa_family;
3282         dest_is_priv = dest_is_loop = 0;
3283         /* Setup our scopes for the destination */
3284         switch (fam) {
3285 #ifdef INET
3286         case AF_INET:
3287                 /* Scope based on outbound address */
3288                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3289                         dest_is_loop = 1;
3290                         if (net != NULL) {
3291                                 /* mark it as local */
3292                                 net->addr_is_local = 1;
3293                         }
3294                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3295                         dest_is_priv = 1;
3296                 }
3297                 break;
3298 #endif
3299 #ifdef INET6
3300         case AF_INET6:
3301                 /* Scope based on outbound address */
3302                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3303                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3304                         /*
3305                          * If the address is a loopback address, which
3306                          * consists of "::1" OR "fe80::1%lo0", we are
3307                          * loopback scope. But we don't use dest_is_priv
3308                          * (link local addresses).
3309                          */
3310                         dest_is_loop = 1;
3311                         if (net != NULL) {
3312                                 /* mark it as local */
3313                                 net->addr_is_local = 1;
3314                         }
3315                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3316                         dest_is_priv = 1;
3317                 }
3318                 break;
3319 #endif
3320         }
3321         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3322         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3323         SCTP_IPI_ADDR_RLOCK();
3324         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3325                 /*
3326                  * Bound all case
3327                  */
3328                 answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3329                     dest_is_priv, dest_is_loop,
3330                     non_asoc_addr_ok, fam);
3331                 SCTP_IPI_ADDR_RUNLOCK();
3332                 return (answer);
3333         }
3334         /*
3335          * Subset bound case
3336          */
3337         if (stcb) {
3338                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3339                     vrf_id, dest_is_priv,
3340                     dest_is_loop,
3341                     non_asoc_addr_ok, fam);
3342         } else {
3343                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3344                     non_asoc_addr_ok,
3345                     dest_is_priv,
3346                     dest_is_loop, fam);
3347         }
3348         SCTP_IPI_ADDR_RUNLOCK();
3349         return (answer);
3350 }
3351
3352 static int
3353 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3354 {
3355         struct cmsghdr cmh;
3356         int tlen, at, found;
3357         struct sctp_sndinfo sndinfo;
3358         struct sctp_prinfo prinfo;
3359         struct sctp_authinfo authinfo;
3360
3361         tlen = SCTP_BUF_LEN(control);
3362         at = 0;
3363         found = 0;
3364         /*
3365          * Independent of how many mbufs, find the c_type inside the control
3366          * structure and copy out the data.
3367          */
3368         while (at < tlen) {
3369                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3370                         /* There is not enough room for one more. */
3371                         return (found);
3372                 }
3373                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3374                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3375                         /* We dont't have a complete CMSG header. */
3376                         return (found);
3377                 }
3378                 if (((int)cmh.cmsg_len + at) > tlen) {
3379                         /* We don't have the complete CMSG. */
3380                         return (found);
3381                 }
3382                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3383                     ((c_type == cmh.cmsg_type) ||
3384                     ((c_type == SCTP_SNDRCV) &&
3385                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3386                     (cmh.cmsg_type == SCTP_PRINFO) ||
3387                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3388                         if (c_type == cmh.cmsg_type) {
3389                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
3390                                         return (found);
3391                                 }
3392                                 /* It is exactly what we want. Copy it out. */
3393                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
3394                                 return (1);
3395                         } else {
3396                                 struct sctp_sndrcvinfo *sndrcvinfo;
3397
3398                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3399                                 if (found == 0) {
3400                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3401                                                 return (found);
3402                                         }
3403                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3404                                 }
3405                                 switch (cmh.cmsg_type) {
3406                                 case SCTP_SNDINFO:
3407                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
3408                                                 return (found);
3409                                         }
3410                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3411                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3412                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3413                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3414                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3415                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3416                                         break;
3417                                 case SCTP_PRINFO:
3418                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
3419                                                 return (found);
3420                                         }
3421                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3422                                         sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3423                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3424                                         break;
3425                                 case SCTP_AUTHINFO:
3426                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
3427                                                 return (found);
3428                                         }
3429                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3430                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3431                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3432                                         break;
3433                                 default:
3434                                         return (found);
3435                                 }
3436                                 found = 1;
3437                         }
3438                 }
3439                 at += CMSG_ALIGN(cmh.cmsg_len);
3440         }
3441         return (found);
3442 }
3443
3444 static int
3445 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3446 {
3447         struct cmsghdr cmh;
3448         int tlen, at;
3449         struct sctp_initmsg initmsg;
3450
3451 #ifdef INET
3452         struct sockaddr_in sin;
3453
3454 #endif
3455 #ifdef INET6
3456         struct sockaddr_in6 sin6;
3457
3458 #endif
3459
3460         tlen = SCTP_BUF_LEN(control);
3461         at = 0;
3462         while (at < tlen) {
3463                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3464                         /* There is not enough room for one more. */
3465                         *error = EINVAL;
3466                         return (1);
3467                 }
3468                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3469                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3470                         /* We dont't have a complete CMSG header. */
3471                         *error = EINVAL;
3472                         return (1);
3473                 }
3474                 if (((int)cmh.cmsg_len + at) > tlen) {
3475                         /* We don't have the complete CMSG. */
3476                         *error = EINVAL;
3477                         return (1);
3478                 }
3479                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3480                         switch (cmh.cmsg_type) {
3481                         case SCTP_INIT:
3482                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
3483                                         *error = EINVAL;
3484                                         return (1);
3485                                 }
3486                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3487                                 if (initmsg.sinit_max_attempts)
3488                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3489                                 if (initmsg.sinit_num_ostreams)
3490                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3491                                 if (initmsg.sinit_max_instreams)
3492                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3493                                 if (initmsg.sinit_max_init_timeo)
3494                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3495                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3496                                         struct sctp_stream_out *tmp_str;
3497                                         unsigned int i;
3498
3499                                         /* Default is NOT correct */
3500                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3501                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3502                                         SCTP_TCB_UNLOCK(stcb);
3503                                         SCTP_MALLOC(tmp_str,
3504                                             struct sctp_stream_out *,
3505                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3506                                             SCTP_M_STRMO);
3507                                         SCTP_TCB_LOCK(stcb);
3508                                         if (tmp_str != NULL) {
3509                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3510                                                 stcb->asoc.strmout = tmp_str;
3511                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3512                                         } else {
3513                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3514                                         }
3515                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3516                                                 stcb->asoc.strmout[i].next_sequence_sent = 0;
3517                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3518                                                 stcb->asoc.strmout[i].stream_no = i;
3519                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3520                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3521                                         }
3522                                 }
3523                                 break;
3524 #ifdef INET
3525                         case SCTP_DSTADDRV4:
3526                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3527                                         *error = EINVAL;
3528                                         return (1);
3529                                 }
3530                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3531                                 sin.sin_family = AF_INET;
3532                                 sin.sin_len = sizeof(struct sockaddr_in);
3533                                 sin.sin_port = stcb->rport;
3534                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3535                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3536                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3537                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3538                                         *error = EINVAL;
3539                                         return (1);
3540                                 }
3541                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3542                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3543                                         *error = ENOBUFS;
3544                                         return (1);
3545                                 }
3546                                 break;
3547 #endif
3548 #ifdef INET6
3549                         case SCTP_DSTADDRV6:
3550                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3551                                         *error = EINVAL;
3552                                         return (1);
3553                                 }
3554                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3555                                 sin6.sin6_family = AF_INET6;
3556                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3557                                 sin6.sin6_port = stcb->rport;
3558                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3559                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3560                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3561                                         *error = EINVAL;
3562                                         return (1);
3563                                 }
3564 #ifdef INET
3565                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3566                                         in6_sin6_2_sin(&sin, &sin6);
3567                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3568                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3569                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3570                                                 *error = EINVAL;
3571                                                 return (1);
3572                                         }
3573                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3574                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3575                                                 *error = ENOBUFS;
3576                                                 return (1);
3577                                         }
3578                                 } else
3579 #endif
3580                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3581                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3582                                         *error = ENOBUFS;
3583                                         return (1);
3584                                 }
3585                                 break;
3586 #endif
3587                         default:
3588                                 break;
3589                         }
3590                 }
3591                 at += CMSG_ALIGN(cmh.cmsg_len);
3592         }
3593         return (0);
3594 }
3595
3596 static struct sctp_tcb *
3597 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3598     in_port_t port,
3599     struct mbuf *control,
3600     struct sctp_nets **net_p,
3601     int *error)
3602 {
3603         struct cmsghdr cmh;
3604         int tlen, at;
3605         struct sctp_tcb *stcb;
3606         struct sockaddr *addr;
3607
3608 #ifdef INET
3609         struct sockaddr_in sin;
3610
3611 #endif
3612 #ifdef INET6
3613         struct sockaddr_in6 sin6;
3614
3615 #endif
3616
3617         tlen = SCTP_BUF_LEN(control);
3618         at = 0;
3619         while (at < tlen) {
3620                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3621                         /* There is not enough room for one more. */
3622                         *error = EINVAL;
3623                         return (NULL);
3624                 }
3625                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3626                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
3627                         /* We dont't have a complete CMSG header. */
3628                         *error = EINVAL;
3629                         return (NULL);
3630                 }
3631                 if (((int)cmh.cmsg_len + at) > tlen) {
3632                         /* We don't have the complete CMSG. */
3633                         *error = EINVAL;
3634                         return (NULL);
3635                 }
3636                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3637                         switch (cmh.cmsg_type) {
3638 #ifdef INET
3639                         case SCTP_DSTADDRV4:
3640                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
3641                                         *error = EINVAL;
3642                                         return (NULL);
3643                                 }
3644                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3645                                 sin.sin_family = AF_INET;
3646                                 sin.sin_len = sizeof(struct sockaddr_in);
3647                                 sin.sin_port = port;
3648                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3649                                 addr = (struct sockaddr *)&sin;
3650                                 break;
3651 #endif
3652 #ifdef INET6
3653                         case SCTP_DSTADDRV6:
3654                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
3655                                         *error = EINVAL;
3656                                         return (NULL);
3657                                 }
3658                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3659                                 sin6.sin6_family = AF_INET6;
3660                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3661                                 sin6.sin6_port = port;
3662                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3663 #ifdef INET
3664                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3665                                         in6_sin6_2_sin(&sin, &sin6);
3666                                         addr = (struct sockaddr *)&sin;
3667                                 } else
3668 #endif
3669                                         addr = (struct sockaddr *)&sin6;
3670                                 break;
3671 #endif
3672                         default:
3673                                 addr = NULL;
3674                                 break;
3675                         }
3676                         if (addr) {
3677                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3678                                 if (stcb != NULL) {
3679                                         return (stcb);
3680                                 }
3681                         }
3682                 }
3683                 at += CMSG_ALIGN(cmh.cmsg_len);
3684         }
3685         return (NULL);
3686 }
3687
3688 static struct mbuf *
3689 sctp_add_cookie(struct mbuf *init, int init_offset,
3690     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3691 {
3692         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3693         struct sctp_state_cookie *stc;
3694         struct sctp_paramhdr *ph;
3695         uint8_t *foo;
3696         int sig_offset;
3697         uint16_t cookie_sz;
3698
3699         mret = NULL;
3700         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3701             sizeof(struct sctp_paramhdr)), 0,
3702             M_DONTWAIT, 1, MT_DATA);
3703         if (mret == NULL) {
3704                 return (NULL);
3705         }
3706         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3707         if (copy_init == NULL) {
3708                 sctp_m_freem(mret);
3709                 return (NULL);
3710         }
3711 #ifdef SCTP_MBUF_LOGGING
3712         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3713                 struct mbuf *mat;
3714
3715                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3716                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3717                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3718                         }
3719                 }
3720         }
3721 #endif
3722         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3723             M_DONTWAIT);
3724         if (copy_initack == NULL) {
3725                 sctp_m_freem(mret);
3726                 sctp_m_freem(copy_init);
3727                 return (NULL);
3728         }
3729 #ifdef SCTP_MBUF_LOGGING
3730         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3731                 struct mbuf *mat;
3732
3733                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3734                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3735                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3736                         }
3737                 }
3738         }
3739 #endif
3740         /* easy side we just drop it on the end */
3741         ph = mtod(mret, struct sctp_paramhdr *);
3742         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3743             sizeof(struct sctp_paramhdr);
3744         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3745             sizeof(struct sctp_paramhdr));
3746         ph->param_type = htons(SCTP_STATE_COOKIE);
3747         ph->param_length = 0;   /* fill in at the end */
3748         /* Fill in the stc cookie data */
3749         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3750
3751         /* tack the INIT and then the INIT-ACK onto the chain */
3752         cookie_sz = 0;
3753         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3754                 cookie_sz += SCTP_BUF_LEN(m_at);
3755                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3756                         SCTP_BUF_NEXT(m_at) = copy_init;
3757                         break;
3758                 }
3759         }
3760         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3761                 cookie_sz += SCTP_BUF_LEN(m_at);
3762                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3763                         SCTP_BUF_NEXT(m_at) = copy_initack;
3764                         break;
3765                 }
3766         }
3767         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3768                 cookie_sz += SCTP_BUF_LEN(m_at);
3769                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3770                         break;
3771                 }
3772         }
3773         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3774         if (sig == NULL) {
3775                 /* no space, so free the entire chain */
3776                 sctp_m_freem(mret);
3777                 return (NULL);
3778         }
3779         SCTP_BUF_LEN(sig) = 0;
3780         SCTP_BUF_NEXT(m_at) = sig;
3781         sig_offset = 0;
3782         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3783         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3784         *signature = foo;
3785         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3786         cookie_sz += SCTP_SIGNATURE_SIZE;
3787         ph->param_length = htons(cookie_sz);
3788         return (mret);
3789 }
3790
3791
3792 static uint8_t
3793 sctp_get_ect(struct sctp_tcb *stcb)
3794 {
3795         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3796                 return (SCTP_ECT0_BIT);
3797         } else {
3798                 return (0);
3799         }
3800 }
3801
3802 #if defined(INET) || defined(INET6)
3803 static void
3804 sctp_handle_no_route(struct sctp_tcb *stcb,
3805     struct sctp_nets *net,
3806     int so_locked)
3807 {
3808         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
3809
3810         if (net) {
3811                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
3812                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
3813                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
3814                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
3815                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
3816                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
3817                                     stcb, 0,
3818                                     (void *)net,
3819                                     so_locked);
3820                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
3821                                 net->dest_state &= ~SCTP_ADDR_PF;
3822                         }
3823                 }
3824                 if (stcb) {
3825                         if (net == stcb->asoc.primary_destination) {
3826                                 /* need a new primary */
3827                                 struct sctp_nets *alt;
3828
3829                                 alt = sctp_find_alternate_net(stcb, net, 0);
3830                                 if (alt != net) {
3831                                         if (stcb->asoc.alternate) {
3832                                                 sctp_free_remote_addr(stcb->asoc.alternate);
3833                                         }
3834                                         stcb->asoc.alternate = alt;
3835                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
3836                                         if (net->ro._s_addr) {
3837                                                 sctp_free_ifa(net->ro._s_addr);
3838                                                 net->ro._s_addr = NULL;
3839                                         }
3840                                         net->src_addr_selected = 0;
3841                                 }
3842                         }
3843                 }
3844         }
3845 }
3846
3847 #endif
3848
3849 static int
3850 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
3851     struct sctp_tcb *stcb,      /* may be NULL */
3852     struct sctp_nets *net,
3853     struct sockaddr *to,
3854     struct mbuf *m,
3855     uint32_t auth_offset,
3856     struct sctp_auth_chunk *auth,
3857     uint16_t auth_keyid,
3858     int nofragment_flag,
3859     int ecn_ok,
3860     int out_of_asoc_ok,
3861     uint16_t src_port,
3862     uint16_t dest_port,
3863     uint32_t v_tag,
3864     uint16_t port,
3865     union sctp_sockstore *over_addr,
3866     uint8_t use_mflowid, uint32_t mflowid,
3867 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
3868     int so_locked SCTP_UNUSED
3869 #else
3870     int so_locked
3871 #endif
3872 )
3873 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
3874 {
3875         /**
3876          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
3877          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
3878          * - fill in the HMAC digest of any AUTH chunk in the packet.
3879          * - calculate and fill in the SCTP checksum.
3880          * - prepend an IP address header.
3881          * - if boundall use INADDR_ANY.
3882          * - if boundspecific do source address selection.
3883          * - set fragmentation option for ipV4.
3884          * - On return from IP output, check/adjust mtu size of output
3885          *   interface and smallest_mtu size as well.
3886          */
3887         /* Will need ifdefs around this */
3888         struct mbuf *newm;
3889         struct sctphdr *sctphdr;
3890         int packet_length;
3891         int ret;
3892         uint32_t vrf_id;
3893
3894 #if defined(INET) || defined(INET6)
3895         struct mbuf *o_pak;
3896         sctp_route_t *ro = NULL;
3897         struct udphdr *udp = NULL;
3898
3899 #endif
3900         uint8_t tos_value;
3901
3902 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3903         struct socket *so = NULL;
3904
3905 #endif
3906
3907         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
3908                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
3909                 sctp_m_freem(m);
3910                 return (EFAULT);
3911         }
3912         if (stcb) {
3913                 vrf_id = stcb->asoc.vrf_id;
3914         } else {
3915                 vrf_id = inp->def_vrf_id;
3916         }
3917
3918         /* fill in the HMAC digest for any AUTH chunk in the packet */
3919         if ((auth != NULL) && (stcb != NULL)) {
3920                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
3921         }
3922         if (net) {
3923                 tos_value = net->dscp;
3924         } else if (stcb) {
3925                 tos_value = stcb->asoc.default_dscp;
3926         } else {
3927                 tos_value = inp->sctp_ep.default_dscp;
3928         }
3929
3930         switch (to->sa_family) {
3931 #ifdef INET
3932         case AF_INET:
3933                 {
3934                         struct ip *ip = NULL;
3935                         sctp_route_t iproute;
3936                         int len;
3937
3938                         len = sizeof(struct ip) + sizeof(struct sctphdr);
3939                         if (port) {
3940                                 len += sizeof(struct udphdr);
3941                         }
3942                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
3943                         if (newm == NULL) {
3944                                 sctp_m_freem(m);
3945                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
3946                                 return (ENOMEM);
3947                         }
3948                         SCTP_ALIGN_TO_END(newm, len);
3949                         SCTP_BUF_LEN(newm) = len;
3950                         SCTP_BUF_NEXT(newm) = m;
3951                         m = newm;
3952                         if (net != NULL) {
3953 #ifdef INVARIANTS
3954                                 if (net->flowidset == 0) {
3955                                         panic("Flow ID not set");
3956                                 }
3957 #endif
3958                                 m->m_pkthdr.flowid = net->flowid;
3959                                 m->m_flags |= M_FLOWID;
3960                         } else {
3961                                 if (use_mflowid != 0) {
3962                                         m->m_pkthdr.flowid = mflowid;
3963                                         m->m_flags |= M_FLOWID;
3964                                 }
3965                         }
3966                         packet_length = sctp_calculate_len(m);
3967                         ip = mtod(m, struct ip *);
3968                         ip->ip_v = IPVERSION;
3969                         ip->ip_hl = (sizeof(struct ip) >> 2);
3970                         if (tos_value == 0) {
3971                                 /*
3972                                  * This means especially, that it is not set
3973                                  * at the SCTP layer. So use the value from
3974                                  * the IP layer.
3975                                  */
3976                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
3977                         }
3978                         tos_value &= 0xfc;
3979                         if (ecn_ok) {
3980                                 tos_value |= sctp_get_ect(stcb);
3981                         }
3982                         if ((nofragment_flag) && (port == 0)) {
3983                                 ip->ip_off = IP_DF;
3984                         } else
3985                                 ip->ip_off = 0;
3986
3987                         /* FreeBSD has a function for ip_id's */
3988                         ip->ip_id = ip_newid();
3989
3990                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
3991                         ip->ip_len = packet_length;
3992                         ip->ip_tos = tos_value;
3993                         if (port) {
3994                                 ip->ip_p = IPPROTO_UDP;
3995                         } else {
3996                                 ip->ip_p = IPPROTO_SCTP;
3997                         }
3998                         ip->ip_sum = 0;
3999                         if (net == NULL) {
4000                                 ro = &iproute;
4001                                 memset(&iproute, 0, sizeof(iproute));
4002                                 memcpy(&ro->ro_dst, to, to->sa_len);
4003                         } else {
4004                                 ro = (sctp_route_t *) & net->ro;
4005                         }
4006                         /* Now the address selection part */
4007                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
4008
4009                         /* call the routine to select the src address */
4010                         if (net && out_of_asoc_ok == 0) {
4011                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4012                                         sctp_free_ifa(net->ro._s_addr);
4013                                         net->ro._s_addr = NULL;
4014                                         net->src_addr_selected = 0;
4015                                         if (ro->ro_rt) {
4016                                                 RTFREE(ro->ro_rt);
4017                                                 ro->ro_rt = NULL;
4018                                         }
4019                                 }
4020                                 if (net->src_addr_selected == 0) {
4021                                         /* Cache the source address */
4022                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
4023                                             ro, net, 0,
4024                                             vrf_id);
4025                                         net->src_addr_selected = 1;
4026                                 }
4027                                 if (net->ro._s_addr == NULL) {
4028                                         /* No route to host */
4029                                         net->src_addr_selected = 0;
4030                                         sctp_handle_no_route(stcb, net, so_locked);
4031                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4032                                         sctp_m_freem(m);
4033                                         return (EHOSTUNREACH);
4034                                 }
4035                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
4036                         } else {
4037                                 if (over_addr == NULL) {
4038                                         struct sctp_ifa *_lsrc;
4039
4040                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4041                                             net,
4042                                             out_of_asoc_ok,
4043                                             vrf_id);
4044                                         if (_lsrc == NULL) {
4045                                                 sctp_handle_no_route(stcb, net, so_locked);
4046                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4047                                                 sctp_m_freem(m);
4048                                                 return (EHOSTUNREACH);
4049                                         }
4050                                         ip->ip_src = _lsrc->address.sin.sin_addr;
4051                                         sctp_free_ifa(_lsrc);
4052                                 } else {
4053                                         ip->ip_src = over_addr->sin.sin_addr;
4054                                         SCTP_RTALLOC(ro, vrf_id);
4055                                 }
4056                         }
4057                         if (port) {
4058                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4059                                         sctp_handle_no_route(stcb, net, so_locked);
4060                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4061                                         sctp_m_freem(m);
4062                                         return (EHOSTUNREACH);
4063                                 }
4064                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
4065                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4066                                 udp->uh_dport = port;
4067                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
4068                                 if (V_udp_cksum) {
4069                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
4070                                 } else {
4071                                         udp->uh_sum = 0;
4072                                 }
4073                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4074                         } else {
4075                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
4076                         }
4077
4078                         sctphdr->src_port = src_port;
4079                         sctphdr->dest_port = dest_port;
4080                         sctphdr->v_tag = v_tag;
4081                         sctphdr->checksum = 0;
4082
4083                         /*
4084                          * If source address selection fails and we find no
4085                          * route then the ip_output should fail as well with
4086                          * a NO_ROUTE_TO_HOST type error. We probably should
4087                          * catch that somewhere and abort the association
4088                          * right away (assuming this is an INIT being sent).
4089                          */
4090                         if (ro->ro_rt == NULL) {
4091                                 /*
4092                                  * src addr selection failed to find a route
4093                                  * (or valid source addr), so we can't get
4094                                  * there from here (yet)!
4095                                  */
4096                                 sctp_handle_no_route(stcb, net, so_locked);
4097                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4098                                 sctp_m_freem(m);
4099                                 return (EHOSTUNREACH);
4100                         }
4101                         if (ro != &iproute) {
4102                                 memcpy(&iproute, ro, sizeof(*ro));
4103                         }
4104                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
4105                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
4106                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
4107                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
4108                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
4109                             (void *)ro->ro_rt);
4110
4111                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4112                                 /* failed to prepend data, give up */
4113                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4114                                 sctp_m_freem(m);
4115                                 return (ENOMEM);
4116                         }
4117                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4118                         if (port) {
4119 #if defined(SCTP_WITH_NO_CSUM)
4120                                 SCTP_STAT_INCR(sctps_sendnocrc);
4121 #else
4122                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4123                                 SCTP_STAT_INCR(sctps_sendswcrc);
4124 #endif
4125                                 if (V_udp_cksum) {
4126                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4127                                 }
4128                         } else {
4129 #if defined(SCTP_WITH_NO_CSUM)
4130                                 SCTP_STAT_INCR(sctps_sendnocrc);
4131 #else
4132                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4133                                 m->m_pkthdr.csum_data = 0;
4134                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4135 #endif
4136                         }
4137 #ifdef SCTP_PACKET_LOGGING
4138                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4139                                 sctp_packet_log(o_pak);
4140 #endif
4141                         /* send it out.  table id is taken from stcb */
4142 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4143                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4144                                 so = SCTP_INP_SO(inp);
4145                                 SCTP_SOCKET_UNLOCK(so, 0);
4146                         }
4147 #endif
4148                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4149 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4150                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4151                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4152                                 SCTP_TCB_UNLOCK(stcb);
4153                                 SCTP_SOCKET_LOCK(so, 0);
4154                                 SCTP_TCB_LOCK(stcb);
4155                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4156                         }
4157 #endif
4158                         SCTP_STAT_INCR(sctps_sendpackets);
4159                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4160                         if (ret)
4161                                 SCTP_STAT_INCR(sctps_senderrors);
4162
4163                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4164                         if (net == NULL) {
4165                                 /* free tempy routes */
4166                                 RO_RTFREE(ro);
4167                         } else {
4168                                 /*
4169                                  * PMTU check versus smallest asoc MTU goes
4170                                  * here
4171                                  */
4172                                 if ((ro->ro_rt != NULL) &&
4173                                     (net->ro._s_addr)) {
4174                                         uint32_t mtu;
4175
4176                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4177                                         if (net->port) {
4178                                                 mtu -= sizeof(struct udphdr);
4179                                         }
4180                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4181                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4182                                                 net->mtu = mtu;
4183                                         }
4184                                 } else if (ro->ro_rt == NULL) {
4185                                         /* route was freed */
4186                                         if (net->ro._s_addr &&
4187                                             net->src_addr_selected) {
4188                                                 sctp_free_ifa(net->ro._s_addr);
4189                                                 net->ro._s_addr = NULL;
4190                                         }
4191                                         net->src_addr_selected = 0;
4192                                 }
4193                         }
4194                         return (ret);
4195                 }
4196 #endif
4197 #ifdef INET6
4198         case AF_INET6:
4199                 {
4200                         uint32_t flowlabel, flowinfo;
4201                         struct ip6_hdr *ip6h;
4202                         struct route_in6 ip6route;
4203                         struct ifnet *ifp;
4204                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4205                         int prev_scope = 0;
4206                         struct sockaddr_in6 lsa6_storage;
4207                         int error;
4208                         u_short prev_port = 0;
4209                         int len;
4210
4211                         if (net) {
4212                                 flowlabel = net->flowlabel;
4213                         } else if (stcb) {
4214                                 flowlabel = stcb->asoc.default_flowlabel;
4215                         } else {
4216                                 flowlabel = inp->sctp_ep.default_flowlabel;
4217                         }
4218                         if (flowlabel == 0) {
4219                                 /*
4220                                  * This means especially, that it is not set
4221                                  * at the SCTP layer. So use the value from
4222                                  * the IP layer.
4223                                  */
4224                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4225                         }
4226                         flowlabel &= 0x000fffff;
4227                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4228                         if (port) {
4229                                 len += sizeof(struct udphdr);
4230                         }
4231                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4232                         if (newm == NULL) {
4233                                 sctp_m_freem(m);
4234                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4235                                 return (ENOMEM);
4236                         }
4237                         SCTP_ALIGN_TO_END(newm, len);
4238                         SCTP_BUF_LEN(newm) = len;
4239                         SCTP_BUF_NEXT(newm) = m;
4240                         m = newm;
4241                         if (net != NULL) {
4242 #ifdef INVARIANTS
4243                                 if (net->flowidset == 0) {
4244                                         panic("Flow ID not set");
4245                                 }
4246 #endif
4247                                 m->m_pkthdr.flowid = net->flowid;
4248                                 m->m_flags |= M_FLOWID;
4249                         } else {
4250                                 if (use_mflowid != 0) {
4251                                         m->m_pkthdr.flowid = mflowid;
4252                                         m->m_flags |= M_FLOWID;
4253                                 }
4254                         }
4255                         packet_length = sctp_calculate_len(m);
4256
4257                         ip6h = mtod(m, struct ip6_hdr *);
4258                         /* protect *sin6 from overwrite */
4259                         sin6 = (struct sockaddr_in6 *)to;
4260                         tmp = *sin6;
4261                         sin6 = &tmp;
4262
4263                         /* KAME hack: embed scopeid */
4264                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4265                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4266                                 return (EINVAL);
4267                         }
4268                         if (net == NULL) {
4269                                 memset(&ip6route, 0, sizeof(ip6route));
4270                                 ro = (sctp_route_t *) & ip6route;
4271                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4272                         } else {
4273                                 ro = (sctp_route_t *) & net->ro;
4274                         }
4275                         /*
4276                          * We assume here that inp_flow is in host byte
4277                          * order within the TCB!
4278                          */
4279                         if (tos_value == 0) {
4280                                 /*
4281                                  * This means especially, that it is not set
4282                                  * at the SCTP layer. So use the value from
4283                                  * the IP layer.
4284                                  */
4285                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4286                         }
4287                         tos_value &= 0xfc;
4288                         if (ecn_ok) {
4289                                 tos_value |= sctp_get_ect(stcb);
4290                         }
4291                         flowinfo = 0x06;
4292                         flowinfo <<= 8;
4293                         flowinfo |= tos_value;
4294                         flowinfo <<= 20;
4295                         flowinfo |= flowlabel;
4296                         ip6h->ip6_flow = htonl(flowinfo);
4297                         if (port) {
4298                                 ip6h->ip6_nxt = IPPROTO_UDP;
4299                         } else {
4300                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4301                         }
4302                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4303                         ip6h->ip6_dst = sin6->sin6_addr;
4304
4305                         /*
4306                          * Add SRC address selection here: we can only reuse
4307                          * to a limited degree the kame src-addr-sel, since
4308                          * we can try their selection but it may not be
4309                          * bound.
4310                          */
4311                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4312                         lsa6_tmp.sin6_family = AF_INET6;
4313                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4314                         lsa6 = &lsa6_tmp;
4315                         if (net && out_of_asoc_ok == 0) {
4316                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4317                                         sctp_free_ifa(net->ro._s_addr);
4318                                         net->ro._s_addr = NULL;
4319                                         net->src_addr_selected = 0;
4320                                         if (ro->ro_rt) {
4321                                                 RTFREE(ro->ro_rt);
4322                                                 ro->ro_rt = NULL;
4323                                         }
4324                                 }
4325                                 if (net->src_addr_selected == 0) {
4326                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4327                                         /* KAME hack: embed scopeid */
4328                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4329                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4330                                                 return (EINVAL);
4331                                         }
4332                                         /* Cache the source address */
4333                                         net->ro._s_addr = sctp_source_address_selection(inp,
4334                                             stcb,
4335                                             ro,
4336                                             net,
4337                                             0,
4338                                             vrf_id);
4339                                         (void)sa6_recoverscope(sin6);
4340                                         net->src_addr_selected = 1;
4341                                 }
4342                                 if (net->ro._s_addr == NULL) {
4343                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4344                                         net->src_addr_selected = 0;
4345                                         sctp_handle_no_route(stcb, net, so_locked);
4346                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4347                                         sctp_m_freem(m);
4348                                         return (EHOSTUNREACH);
4349                                 }
4350                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4351                         } else {
4352                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4353                                 /* KAME hack: embed scopeid */
4354                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4355                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4356                                         return (EINVAL);
4357                                 }
4358                                 if (over_addr == NULL) {
4359                                         struct sctp_ifa *_lsrc;
4360
4361                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4362                                             net,
4363                                             out_of_asoc_ok,
4364                                             vrf_id);
4365                                         if (_lsrc == NULL) {
4366                                                 sctp_handle_no_route(stcb, net, so_locked);
4367                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4368                                                 sctp_m_freem(m);
4369                                                 return (EHOSTUNREACH);
4370                                         }
4371                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4372                                         sctp_free_ifa(_lsrc);
4373                                 } else {
4374                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4375                                         SCTP_RTALLOC(ro, vrf_id);
4376                                 }
4377                                 (void)sa6_recoverscope(sin6);
4378                         }
4379                         lsa6->sin6_port = inp->sctp_lport;
4380
4381                         if (ro->ro_rt == NULL) {
4382                                 /*
4383                                  * src addr selection failed to find a route
4384                                  * (or valid source addr), so we can't get
4385                                  * there from here!
4386                                  */
4387                                 sctp_handle_no_route(stcb, net, so_locked);
4388                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4389                                 sctp_m_freem(m);
4390                                 return (EHOSTUNREACH);
4391                         }
4392                         /*
4393                          * XXX: sa6 may not have a valid sin6_scope_id in
4394                          * the non-SCOPEDROUTING case.
4395                          */
4396                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4397                         lsa6_storage.sin6_family = AF_INET6;
4398                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4399                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4400                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4401                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4402                                 sctp_m_freem(m);
4403                                 return (error);
4404                         }
4405                         /* XXX */
4406                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4407                         lsa6_storage.sin6_port = inp->sctp_lport;
4408                         lsa6 = &lsa6_storage;
4409                         ip6h->ip6_src = lsa6->sin6_addr;
4410
4411                         if (port) {
4412                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4413                                         sctp_handle_no_route(stcb, net, so_locked);
4414                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4415                                         sctp_m_freem(m);
4416                                         return (EHOSTUNREACH);
4417                                 }
4418                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4419                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4420                                 udp->uh_dport = port;
4421                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4422                                 udp->uh_sum = 0;
4423                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4424                         } else {
4425                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4426                         }
4427
4428                         sctphdr->src_port = src_port;
4429                         sctphdr->dest_port = dest_port;
4430                         sctphdr->v_tag = v_tag;
4431                         sctphdr->checksum = 0;
4432
4433                         /*
4434                          * We set the hop limit now since there is a good
4435                          * chance that our ro pointer is now filled
4436                          */
4437                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4438                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4439
4440 #ifdef SCTP_DEBUG
4441                         /* Copy to be sure something bad is not happening */
4442                         sin6->sin6_addr = ip6h->ip6_dst;
4443                         lsa6->sin6_addr = ip6h->ip6_src;
4444 #endif
4445
4446                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4447                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4448                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4449                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4450                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4451                         if (net) {
4452                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4453                                 /*
4454                                  * preserve the port and scope for link
4455                                  * local send
4456                                  */
4457                                 prev_scope = sin6->sin6_scope_id;
4458                                 prev_port = sin6->sin6_port;
4459                         }
4460                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4461                                 /* failed to prepend data, give up */
4462                                 sctp_m_freem(m);
4463                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4464                                 return (ENOMEM);
4465                         }
4466                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4467                         if (port) {
4468 #if defined(SCTP_WITH_NO_CSUM)
4469                                 SCTP_STAT_INCR(sctps_sendnocrc);
4470 #else
4471                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4472                                 SCTP_STAT_INCR(sctps_sendswcrc);
4473 #endif
4474                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4475                                         udp->uh_sum = 0xffff;
4476                                 }
4477                         } else {
4478 #if defined(SCTP_WITH_NO_CSUM)
4479                                 SCTP_STAT_INCR(sctps_sendnocrc);
4480 #else
4481                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4482                                 m->m_pkthdr.csum_data = 0;
4483                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4484 #endif
4485                         }
4486                         /* send it out. table id is taken from stcb */
4487 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4488                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4489                                 so = SCTP_INP_SO(inp);
4490                                 SCTP_SOCKET_UNLOCK(so, 0);
4491                         }
4492 #endif
4493 #ifdef SCTP_PACKET_LOGGING
4494                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4495                                 sctp_packet_log(o_pak);
4496 #endif
4497                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4498 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4499                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4500                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4501                                 SCTP_TCB_UNLOCK(stcb);
4502                                 SCTP_SOCKET_LOCK(so, 0);
4503                                 SCTP_TCB_LOCK(stcb);
4504                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4505                         }
4506 #endif
4507                         if (net) {
4508                                 /* for link local this must be done */
4509                                 sin6->sin6_scope_id = prev_scope;
4510                                 sin6->sin6_port = prev_port;
4511                         }
4512                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4513                         SCTP_STAT_INCR(sctps_sendpackets);
4514                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4515                         if (ret) {
4516                                 SCTP_STAT_INCR(sctps_senderrors);
4517                         }
4518                         if (net == NULL) {
4519                                 /* Now if we had a temp route free it */
4520                                 RO_RTFREE(ro);
4521                         } else {
4522                                 /*
4523                                  * PMTU check versus smallest asoc MTU goes
4524                                  * here
4525                                  */
4526                                 if (ro->ro_rt == NULL) {
4527                                         /* Route was freed */
4528                                         if (net->ro._s_addr &&
4529                                             net->src_addr_selected) {
4530                                                 sctp_free_ifa(net->ro._s_addr);
4531                                                 net->ro._s_addr = NULL;
4532                                         }
4533                                         net->src_addr_selected = 0;
4534                                 }
4535                                 if ((ro->ro_rt != NULL) &&
4536                                     (net->ro._s_addr)) {
4537                                         uint32_t mtu;
4538
4539                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4540                                         if (mtu &&
4541                                             (stcb->asoc.smallest_mtu > mtu)) {
4542                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4543                                                 net->mtu = mtu;
4544                                                 if (net->port) {
4545                                                         net->mtu -= sizeof(struct udphdr);
4546                                                 }
4547                                         }
4548                                 } else if (ifp) {
4549                                         if (ND_IFINFO(ifp)->linkmtu &&
4550                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4551                                                 sctp_mtu_size_reset(inp,
4552                                                     &stcb->asoc,
4553                                                     ND_IFINFO(ifp)->linkmtu);
4554                                         }
4555                                 }
4556                         }
4557                         return (ret);
4558                 }
4559 #endif
4560         default:
4561                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4562                     ((struct sockaddr *)to)->sa_family);
4563                 sctp_m_freem(m);
4564                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4565                 return (EFAULT);
4566         }
4567 }
4568
4569
4570 void
4571 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4572 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4573     SCTP_UNUSED
4574 #endif
4575 )
4576 {
4577         struct mbuf *m, *m_at, *mp_last;
4578         struct sctp_nets *net;
4579         struct sctp_init_chunk *init;
4580         struct sctp_supported_addr_param *sup_addr;
4581         struct sctp_adaptation_layer_indication *ali;
4582         struct sctp_ecn_supported_param *ecn;
4583         struct sctp_prsctp_supported_param *prsctp;
4584         struct sctp_supported_chunk_types_param *pr_supported;
4585         int cnt_inits_to = 0;
4586         int padval, ret;
4587         int num_ext;
4588         int p_len;
4589
4590         /* INIT's always go to the primary (and usually ONLY address) */
4591         mp_last = NULL;
4592         net = stcb->asoc.primary_destination;
4593         if (net == NULL) {
4594                 net = TAILQ_FIRST(&stcb->asoc.nets);
4595                 if (net == NULL) {
4596                         /* TSNH */
4597                         return;
4598                 }
4599                 /* we confirm any address we send an INIT to */
4600                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4601                 (void)sctp_set_primary_addr(stcb, NULL, net);
4602         } else {
4603                 /* we confirm any address we send an INIT to */
4604                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4605         }
4606         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4607 #ifdef INET6
4608         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4609                 /*
4610                  * special hook, if we are sending to link local it will not
4611                  * show up in our private address count.
4612                  */
4613                 struct sockaddr_in6 *sin6l;
4614
4615                 sin6l = &net->ro._l_addr.sin6;
4616                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4617                         cnt_inits_to = 1;
4618         }
4619 #endif
4620         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4621                 /* This case should not happen */
4622                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4623                 return;
4624         }
4625         /* start the INIT timer */
4626         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4627
4628         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4629         if (m == NULL) {
4630                 /* No memory, INIT timer will re-attempt. */
4631                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4632                 return;
4633         }
4634         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4635         /*
4636          * assume peer supports asconf in order to be able to queue local
4637          * address changes while an INIT is in flight and before the assoc
4638          * is established.
4639          */
4640         stcb->asoc.peer_supports_asconf = 1;
4641         /* Now lets put the SCTP header in place */
4642         init = mtod(m, struct sctp_init_chunk *);
4643         /* now the chunk header */
4644         init->ch.chunk_type = SCTP_INITIATION;
4645         init->ch.chunk_flags = 0;
4646         /* fill in later from mbuf we build */
4647         init->ch.chunk_length = 0;
4648         /* place in my tag */
4649         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4650         /* set up some of the credits. */
4651         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4652             SCTP_MINIMAL_RWND));
4653
4654         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4655         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4656         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4657         /* now the address restriction */
4658         /* XXX Should we take the address family of the socket into account? */
4659         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4660             sizeof(*init));
4661         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4662 #ifdef INET6
4663 #ifdef INET
4664         /* we support 2 types: IPv4/IPv6 */
4665         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4666         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4667         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4668 #else
4669         /* we support 1 type: IPv6 */
4670         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4671         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4672         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4673 #endif
4674 #else
4675         /* we support 1 type: IPv4 */
4676         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4677         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4678         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4679 #endif
4680         SCTP_BUF_LEN(m) += sizeof(struct sctp_supported_addr_param);
4681         /* adaptation layer indication parameter */
4682         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(struct sctp_supported_addr_param));
4683         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4684         ali->ph.param_length = htons(sizeof(*ali));
4685         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4686         SCTP_BUF_LEN(m) += sizeof(*ali);
4687         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4688
4689         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4690                 /* Add NAT friendly parameter */
4691                 struct sctp_paramhdr *ph;
4692
4693                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4694                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4695                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4696                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4697                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4698         }
4699         /* now any cookie time extensions */
4700         if (stcb->asoc.cookie_preserve_req) {
4701                 struct sctp_cookie_perserve_param *cookie_preserve;
4702
4703                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4704                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4705                 cookie_preserve->ph.param_length = htons(
4706                     sizeof(*cookie_preserve));
4707                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4708                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4709                 ecn = (struct sctp_ecn_supported_param *)(
4710                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4711                 stcb->asoc.cookie_preserve_req = 0;
4712         }
4713         /* ECN parameter */
4714         if (stcb->asoc.ecn_allowed == 1) {
4715                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4716                 ecn->ph.param_length = htons(sizeof(*ecn));
4717                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4718                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4719                     sizeof(*ecn));
4720         } else {
4721                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4722         }
4723         /* And now tell the peer we do pr-sctp */
4724         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4725         prsctp->ph.param_length = htons(sizeof(*prsctp));
4726         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4727
4728         /* And now tell the peer we do all the extensions */
4729         pr_supported = (struct sctp_supported_chunk_types_param *)
4730             ((caddr_t)prsctp + sizeof(*prsctp));
4731         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4732         num_ext = 0;
4733         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4734         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4735         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4736         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4737         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4738         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4739                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4740         }
4741         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4742                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4743         }
4744         p_len = sizeof(*pr_supported) + num_ext;
4745         pr_supported->ph.param_length = htons(p_len);
4746         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4747         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4748
4749
4750         /* add authentication parameters */
4751         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4752                 struct sctp_auth_random *randp;
4753                 struct sctp_auth_hmac_algo *hmacs;
4754                 struct sctp_auth_chunk_list *chunks;
4755
4756                 /* attach RANDOM parameter, if available */
4757                 if (stcb->asoc.authinfo.random != NULL) {
4758                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4759                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4760                         /* random key already contains the header */
4761                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4762                         /* zero out any padding required */
4763                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4764                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4765                 }
4766                 /* add HMAC_ALGO parameter */
4767                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4768                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4769                     (uint8_t *) hmacs->hmac_ids);
4770                 if (p_len > 0) {
4771                         p_len += sizeof(*hmacs);
4772                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4773                         hmacs->ph.param_length = htons(p_len);
4774                         /* zero out any padding required */
4775                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4776                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4777                 }
4778                 /* add CHUNKS parameter */
4779                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4780                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4781                     chunks->chunk_types);
4782                 if (p_len > 0) {
4783                         p_len += sizeof(*chunks);
4784                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4785                         chunks->ph.param_length = htons(p_len);
4786                         /* zero out any padding required */
4787                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4788                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4789                 }
4790         }
4791         /* now the addresses */
4792         {
4793                 struct sctp_scoping scp;
4794
4795                 /*
4796                  * To optimize this we could put the scoping stuff into a
4797                  * structure and remove the individual uint8's from the
4798                  * assoc structure. Then we could just sifa in the address
4799                  * within the stcb. But for now this is a quick hack to get
4800                  * the address stuff teased apart.
4801                  */
4802
4803                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4804                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4805                 scp.loopback_scope = stcb->asoc.loopback_scope;
4806                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4807                 scp.local_scope = stcb->asoc.local_scope;
4808                 scp.site_scope = stcb->asoc.site_scope;
4809
4810                 sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to);
4811         }
4812
4813         /* calulate the size and update pkt header and chunk header */
4814         p_len = 0;
4815         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4816                 if (SCTP_BUF_NEXT(m_at) == NULL)
4817                         mp_last = m_at;
4818                 p_len += SCTP_BUF_LEN(m_at);
4819         }
4820         init->ch.chunk_length = htons(p_len);
4821         /*
4822          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4823          * here since the timer will drive a retranmission.
4824          */
4825
4826         /* I don't expect this to execute but we will be safe here */
4827         padval = p_len % 4;
4828         if ((padval) && (mp_last)) {
4829                 /*
4830                  * The compiler worries that mp_last may not be set even
4831                  * though I think it is impossible :-> however we add
4832                  * mp_last here just in case.
4833                  */
4834                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4835                 if (ret) {
4836                         /* Houston we have a problem, no space */
4837                         sctp_m_freem(m);
4838                         return;
4839                 }
4840         }
4841         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4842         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4843             (struct sockaddr *)&net->ro._l_addr,
4844             m, 0, NULL, 0, 0, 0, 0,
4845             inp->sctp_lport, stcb->rport, htonl(0),
4846             net->port, NULL,
4847             0, 0,
4848             so_locked);
4849         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4850         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4851         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4852 }
4853
4854 struct mbuf *
4855 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4856     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4857 {
4858         /*
4859          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4860          * being equal to the beginning of the params i.e. (iphlen +
4861          * sizeof(struct sctp_init_msg) parse through the parameters to the
4862          * end of the mbuf verifying that all parameters are known.
4863          *
4864          * For unknown parameters build and return a mbuf with
4865          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4866          * processing this chunk stop, and set *abort_processing to 1.
4867          *
4868          * By having param_offset be pre-set to where parameters begin it is
4869          * hoped that this routine may be reused in the future by new
4870          * features.
4871          */
4872         struct sctp_paramhdr *phdr, params;
4873
4874         struct mbuf *mat, *op_err;
4875         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4876         int at, limit, pad_needed;
4877         uint16_t ptype, plen, padded_size;
4878         int err_at;
4879
4880         *abort_processing = 0;
4881         mat = in_initpkt;
4882         err_at = 0;
4883         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4884         at = param_offset;
4885         op_err = NULL;
4886         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4887         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4888         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4889                 ptype = ntohs(phdr->param_type);
4890                 plen = ntohs(phdr->param_length);
4891                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4892                         /* wacked parameter */
4893                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4894                         goto invalid_size;
4895                 }
4896                 limit -= SCTP_SIZE32(plen);
4897                 /*-
4898                  * All parameters for all chunks that we know/understand are
4899                  * listed here. We process them other places and make
4900                  * appropriate stop actions per the upper bits. However this
4901                  * is the generic routine processor's can call to get back
4902                  * an operr.. to either incorporate (init-ack) or send.
4903                  */
4904                 padded_size = SCTP_SIZE32(plen);
4905                 switch (ptype) {
4906                         /* Param's with variable size */
4907                 case SCTP_HEARTBEAT_INFO:
4908                 case SCTP_STATE_COOKIE:
4909                 case SCTP_UNRECOG_PARAM:
4910                 case SCTP_ERROR_CAUSE_IND:
4911                         /* ok skip fwd */
4912                         at += padded_size;
4913                         break;
4914                         /* Param's with variable size within a range */
4915                 case SCTP_CHUNK_LIST:
4916                 case SCTP_SUPPORTED_CHUNK_EXT:
4917                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4918                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4919                                 goto invalid_size;
4920                         }
4921                         at += padded_size;
4922                         break;
4923                 case SCTP_SUPPORTED_ADDRTYPE:
4924                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4925                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4926                                 goto invalid_size;
4927                         }
4928                         at += padded_size;
4929                         break;
4930                 case SCTP_RANDOM:
4931                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4932                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4933                                 goto invalid_size;
4934                         }
4935                         at += padded_size;
4936                         break;
4937                 case SCTP_SET_PRIM_ADDR:
4938                 case SCTP_DEL_IP_ADDRESS:
4939                 case SCTP_ADD_IP_ADDRESS:
4940                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4941                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4942                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4943                                 goto invalid_size;
4944                         }
4945                         at += padded_size;
4946                         break;
4947                         /* Param's with a fixed size */
4948                 case SCTP_IPV4_ADDRESS:
4949                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4950                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4951                                 goto invalid_size;
4952                         }
4953                         at += padded_size;
4954                         break;
4955                 case SCTP_IPV6_ADDRESS:
4956                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4957                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4958                                 goto invalid_size;
4959                         }
4960                         at += padded_size;
4961                         break;
4962                 case SCTP_COOKIE_PRESERVE:
4963                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4964                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4965                                 goto invalid_size;
4966                         }
4967                         at += padded_size;
4968                         break;
4969                 case SCTP_HAS_NAT_SUPPORT:
4970                         *nat_friendly = 1;
4971                         /* fall through */
4972                 case SCTP_PRSCTP_SUPPORTED:
4973
4974                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4975                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4976                                 goto invalid_size;
4977                         }
4978                         at += padded_size;
4979                         break;
4980                 case SCTP_ECN_CAPABLE:
4981                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4982                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4983                                 goto invalid_size;
4984                         }
4985                         at += padded_size;
4986                         break;
4987                 case SCTP_ULP_ADAPTATION:
4988                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4989                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4990                                 goto invalid_size;
4991                         }
4992                         at += padded_size;
4993                         break;
4994                 case SCTP_SUCCESS_REPORT:
4995                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4996                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4997                                 goto invalid_size;
4998                         }
4999                         at += padded_size;
5000                         break;
5001                 case SCTP_HOSTNAME_ADDRESS:
5002                         {
5003                                 /* We can NOT handle HOST NAME addresses!! */
5004                                 int l_len;
5005
5006                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5007                                 *abort_processing = 1;
5008                                 if (op_err == NULL) {
5009                                         /* Ok need to try to get a mbuf */
5010 #ifdef INET6
5011                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5012 #else
5013                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5014 #endif
5015                                         l_len += plen;
5016                                         l_len += sizeof(struct sctp_paramhdr);
5017                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5018                                         if (op_err) {
5019                                                 SCTP_BUF_LEN(op_err) = 0;
5020                                                 /*
5021                                                  * pre-reserve space for ip
5022                                                  * and sctp header  and
5023                                                  * chunk hdr
5024                                                  */
5025 #ifdef INET6
5026                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5027 #else
5028                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5029 #endif
5030                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5031                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5032                                         }
5033                                 }
5034                                 if (op_err) {
5035                                         /* If we have space */
5036                                         struct sctp_paramhdr s;
5037
5038                                         if (err_at % 4) {
5039                                                 uint32_t cpthis = 0;
5040
5041                                                 pad_needed = 4 - (err_at % 4);
5042                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5043                                                 err_at += pad_needed;
5044                                         }
5045                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5046                                         s.param_length = htons(sizeof(s) + plen);
5047                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5048                                         err_at += sizeof(s);
5049                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5050                                         if (phdr == NULL) {
5051                                                 sctp_m_freem(op_err);
5052                                                 /*
5053                                                  * we are out of memory but
5054                                                  * we still need to have a
5055                                                  * look at what to do (the
5056                                                  * system is in trouble
5057                                                  * though).
5058                                                  */
5059                                                 return (NULL);
5060                                         }
5061                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5062                                 }
5063                                 return (op_err);
5064                                 break;
5065                         }
5066                 default:
5067                         /*
5068                          * we do not recognize the parameter figure out what
5069                          * we do.
5070                          */
5071                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5072                         if ((ptype & 0x4000) == 0x4000) {
5073                                 /* Report bit is set?? */
5074                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5075                                 if (op_err == NULL) {
5076                                         int l_len;
5077
5078                                         /* Ok need to try to get an mbuf */
5079 #ifdef INET6
5080                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5081 #else
5082                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5083 #endif
5084                                         l_len += plen;
5085                                         l_len += sizeof(struct sctp_paramhdr);
5086                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5087                                         if (op_err) {
5088                                                 SCTP_BUF_LEN(op_err) = 0;
5089 #ifdef INET6
5090                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5091 #else
5092                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5093 #endif
5094                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5095                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5096                                         }
5097                                 }
5098                                 if (op_err) {
5099                                         /* If we have space */
5100                                         struct sctp_paramhdr s;
5101
5102                                         if (err_at % 4) {
5103                                                 uint32_t cpthis = 0;
5104
5105                                                 pad_needed = 4 - (err_at % 4);
5106                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5107                                                 err_at += pad_needed;
5108                                         }
5109                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5110                                         s.param_length = htons(sizeof(s) + plen);
5111                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5112                                         err_at += sizeof(s);
5113                                         if (plen > sizeof(tempbuf)) {
5114                                                 plen = sizeof(tempbuf);
5115                                         }
5116                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5117                                         if (phdr == NULL) {
5118                                                 sctp_m_freem(op_err);
5119                                                 /*
5120                                                  * we are out of memory but
5121                                                  * we still need to have a
5122                                                  * look at what to do (the
5123                                                  * system is in trouble
5124                                                  * though).
5125                                                  */
5126                                                 op_err = NULL;
5127                                                 goto more_processing;
5128                                         }
5129                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5130                                         err_at += plen;
5131                                 }
5132                         }
5133         more_processing:
5134                         if ((ptype & 0x8000) == 0x0000) {
5135                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5136                                 return (op_err);
5137                         } else {
5138                                 /* skip this chunk and continue processing */
5139                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5140                                 at += SCTP_SIZE32(plen);
5141                         }
5142                         break;
5143
5144                 }
5145                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5146         }
5147         return (op_err);
5148 invalid_size:
5149         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5150         *abort_processing = 1;
5151         if ((op_err == NULL) && phdr) {
5152                 int l_len;
5153
5154 #ifdef INET6
5155                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5156 #else
5157                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5158 #endif
5159                 l_len += (2 * sizeof(struct sctp_paramhdr));
5160                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5161                 if (op_err) {
5162                         SCTP_BUF_LEN(op_err) = 0;
5163 #ifdef INET6
5164                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5165 #else
5166                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5167 #endif
5168                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5169                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5170                 }
5171         }
5172         if ((op_err) && phdr) {
5173                 struct sctp_paramhdr s;
5174
5175                 if (err_at % 4) {
5176                         uint32_t cpthis = 0;
5177
5178                         pad_needed = 4 - (err_at % 4);
5179                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5180                         err_at += pad_needed;
5181                 }
5182                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5183                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5184                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5185                 err_at += sizeof(s);
5186                 /* Only copy back the p-hdr that caused the issue */
5187                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5188         }
5189         return (op_err);
5190 }
5191
5192 static int
5193 sctp_are_there_new_addresses(struct sctp_association *asoc,
5194     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5195 {
5196         /*
5197          * Given a INIT packet, look through the packet to verify that there
5198          * are NO new addresses. As we go through the parameters add reports
5199          * of any un-understood parameters that require an error.  Also we
5200          * must return (1) to drop the packet if we see a un-understood
5201          * parameter that tells us to drop the chunk.
5202          */
5203         struct sockaddr *sa_touse;
5204         struct sockaddr *sa;
5205         struct sctp_paramhdr *phdr, params;
5206         uint16_t ptype, plen;
5207         uint8_t fnd;
5208         struct sctp_nets *net;
5209
5210 #ifdef INET
5211         struct sockaddr_in sin4, *sa4;
5212
5213 #endif
5214 #ifdef INET6
5215         struct sockaddr_in6 sin6, *sa6;
5216
5217 #endif
5218
5219 #ifdef INET
5220         memset(&sin4, 0, sizeof(sin4));
5221         sin4.sin_family = AF_INET;
5222         sin4.sin_len = sizeof(sin4);
5223 #endif
5224 #ifdef INET6
5225         memset(&sin6, 0, sizeof(sin6));
5226         sin6.sin6_family = AF_INET6;
5227         sin6.sin6_len = sizeof(sin6);
5228 #endif
5229         /* First what about the src address of the pkt ? */
5230         fnd = 0;
5231         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5232                 sa = (struct sockaddr *)&net->ro._l_addr;
5233                 if (sa->sa_family == src->sa_family) {
5234 #ifdef INET
5235                         if (sa->sa_family == AF_INET) {
5236                                 struct sockaddr_in *src4;
5237
5238                                 sa4 = (struct sockaddr_in *)sa;
5239                                 src4 = (struct sockaddr_in *)src;
5240                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5241                                         fnd = 1;
5242                                         break;
5243                                 }
5244                         }
5245 #endif
5246 #ifdef INET6
5247                         if (sa->sa_family == AF_INET6) {
5248                                 struct sockaddr_in6 *src6;
5249
5250                                 sa6 = (struct sockaddr_in6 *)sa;
5251                                 src6 = (struct sockaddr_in6 *)src;
5252                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5253                                         fnd = 1;
5254                                         break;
5255                                 }
5256                         }
5257 #endif
5258                 }
5259         }
5260         if (fnd == 0) {
5261                 /* New address added! no need to look futher. */
5262                 return (1);
5263         }
5264         /* Ok so far lets munge through the rest of the packet */
5265         offset += sizeof(struct sctp_init_chunk);
5266         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5267         while (phdr) {
5268                 sa_touse = NULL;
5269                 ptype = ntohs(phdr->param_type);
5270                 plen = ntohs(phdr->param_length);
5271                 switch (ptype) {
5272 #ifdef INET
5273                 case SCTP_IPV4_ADDRESS:
5274                         {
5275                                 struct sctp_ipv4addr_param *p4, p4_buf;
5276
5277                                 phdr = sctp_get_next_param(in_initpkt, offset,
5278                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5279                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5280                                     phdr == NULL) {
5281                                         return (1);
5282                                 }
5283                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5284                                 sin4.sin_addr.s_addr = p4->addr;
5285                                 sa_touse = (struct sockaddr *)&sin4;
5286                                 break;
5287                         }
5288 #endif
5289 #ifdef INET6
5290                 case SCTP_IPV6_ADDRESS:
5291                         {
5292                                 struct sctp_ipv6addr_param *p6, p6_buf;
5293
5294                                 phdr = sctp_get_next_param(in_initpkt, offset,
5295                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5296                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5297                                     phdr == NULL) {
5298                                         return (1);
5299                                 }
5300                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5301                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5302                                     sizeof(p6->addr));
5303                                 sa_touse = (struct sockaddr *)&sin6;
5304                                 break;
5305                         }
5306 #endif
5307                 default:
5308                         sa_touse = NULL;
5309                         break;
5310                 }
5311                 if (sa_touse) {
5312                         /* ok, sa_touse points to one to check */
5313                         fnd = 0;
5314                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5315                                 sa = (struct sockaddr *)&net->ro._l_addr;
5316                                 if (sa->sa_family != sa_touse->sa_family) {
5317                                         continue;
5318                                 }
5319 #ifdef INET
5320                                 if (sa->sa_family == AF_INET) {
5321                                         sa4 = (struct sockaddr_in *)sa;
5322                                         if (sa4->sin_addr.s_addr ==
5323                                             sin4.sin_addr.s_addr) {
5324                                                 fnd = 1;
5325                                                 break;
5326                                         }
5327                                 }
5328 #endif
5329 #ifdef INET6
5330                                 if (sa->sa_family == AF_INET6) {
5331                                         sa6 = (struct sockaddr_in6 *)sa;
5332                                         if (SCTP6_ARE_ADDR_EQUAL(
5333                                             sa6, &sin6)) {
5334                                                 fnd = 1;
5335                                                 break;
5336                                         }
5337                                 }
5338 #endif
5339                         }
5340                         if (!fnd) {
5341                                 /* New addr added! no need to look further */
5342                                 return (1);
5343                         }
5344                 }
5345                 offset += SCTP_SIZE32(plen);
5346                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5347         }
5348         return (0);
5349 }
5350
5351 /*
5352  * Given a MBUF chain that was sent into us containing an INIT. Build a
5353  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5354  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5355  * message (i.e. the struct sctp_init_msg).
5356  */
5357 void
5358 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5359     struct mbuf *init_pkt, int iphlen, int offset,
5360     struct sockaddr *src, struct sockaddr *dst,
5361     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5362     uint8_t use_mflowid, uint32_t mflowid,
5363     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5364 {
5365         struct sctp_association *asoc;
5366         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5367         struct sctp_init_ack_chunk *initack;
5368         struct sctp_adaptation_layer_indication *ali;
5369         struct sctp_ecn_supported_param *ecn;
5370         struct sctp_prsctp_supported_param *prsctp;
5371         struct sctp_supported_chunk_types_param *pr_supported;
5372         union sctp_sockstore *over_addr;
5373
5374 #ifdef INET
5375         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5376         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5377         struct sockaddr_in *sin;
5378
5379 #endif
5380 #ifdef INET6
5381         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5382         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5383         struct sockaddr_in6 *sin6;
5384
5385 #endif
5386         struct sockaddr *to;
5387         struct sctp_state_cookie stc;
5388         struct sctp_nets *net = NULL;
5389         uint8_t *signature = NULL;
5390         int cnt_inits_to = 0;
5391         uint16_t his_limit, i_want;
5392         int abort_flag, padval;
5393         int num_ext;
5394         int p_len;
5395         int nat_friendly = 0;
5396         struct socket *so;
5397
5398         if (stcb) {
5399                 asoc = &stcb->asoc;
5400         } else {
5401                 asoc = NULL;
5402         }
5403         mp_last = NULL;
5404         if ((asoc != NULL) &&
5405             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5406             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5407                 /* new addresses, out of here in non-cookie-wait states */
5408                 /*
5409                  * Send a ABORT, we don't add the new address error clause
5410                  * though we even set the T bit and copy in the 0 tag.. this
5411                  * looks no different than if no listener was present.
5412                  */
5413                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, NULL,
5414                     use_mflowid, mflowid,
5415                     vrf_id, port);
5416                 return;
5417         }
5418         abort_flag = 0;
5419         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5420             (offset + sizeof(struct sctp_init_chunk)),
5421             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5422         if (abort_flag) {
5423 do_a_abort:
5424                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5425                     init_chk->init.initiate_tag, op_err,
5426                     use_mflowid, mflowid,
5427                     vrf_id, port);
5428                 return;
5429         }
5430         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5431         if (m == NULL) {
5432                 /* No memory, INIT timer will re-attempt. */
5433                 if (op_err)
5434                         sctp_m_freem(op_err);
5435                 return;
5436         }
5437         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5438
5439         /* the time I built cookie */
5440         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5441
5442         /* populate any tie tags */
5443         if (asoc != NULL) {
5444                 /* unlock before tag selections */
5445                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5446                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5447                 stc.cookie_life = asoc->cookie_life;
5448                 net = asoc->primary_destination;
5449         } else {
5450                 stc.tie_tag_my_vtag = 0;
5451                 stc.tie_tag_peer_vtag = 0;
5452                 /* life I will award this cookie */
5453                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5454         }
5455
5456         /* copy in the ports for later check */
5457         stc.myport = sh->dest_port;
5458         stc.peerport = sh->src_port;
5459
5460         /*
5461          * If we wanted to honor cookie life extentions, we would add to
5462          * stc.cookie_life. For now we should NOT honor any extension
5463          */
5464         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5465         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5466                 struct inpcb *in_inp;
5467
5468                 /* Its a V6 socket */
5469                 in_inp = (struct inpcb *)inp;
5470                 stc.ipv6_addr_legal = 1;
5471                 /* Now look at the binding flag to see if V4 will be legal */
5472                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5473                         stc.ipv4_addr_legal = 1;
5474                 } else {
5475                         /* V4 addresses are NOT legal on the association */
5476                         stc.ipv4_addr_legal = 0;
5477                 }
5478         } else {
5479                 /* Its a V4 socket, no - V6 */
5480                 stc.ipv4_addr_legal = 1;
5481                 stc.ipv6_addr_legal = 0;
5482         }
5483
5484 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5485         stc.ipv4_scope = 1;
5486 #else
5487         stc.ipv4_scope = 0;
5488 #endif
5489         if (net == NULL) {
5490                 to = src;
5491                 switch (dst->sa_family) {
5492 #ifdef INET
5493                 case AF_INET:
5494                         {
5495                                 /* lookup address */
5496                                 stc.address[0] = src4->sin_addr.s_addr;
5497                                 stc.address[1] = 0;
5498                                 stc.address[2] = 0;
5499                                 stc.address[3] = 0;
5500                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5501                                 /* local from address */
5502                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5503                                 stc.laddress[1] = 0;
5504                                 stc.laddress[2] = 0;
5505                                 stc.laddress[3] = 0;
5506                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5507                                 /* scope_id is only for v6 */
5508                                 stc.scope_id = 0;
5509 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5510                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5511                                         stc.ipv4_scope = 1;
5512                                 }
5513 #else
5514                                 stc.ipv4_scope = 1;
5515 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5516                                 /* Must use the address in this case */
5517                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5518                                         stc.loopback_scope = 1;
5519                                         stc.ipv4_scope = 1;
5520                                         stc.site_scope = 1;
5521                                         stc.local_scope = 0;
5522                                 }
5523                                 break;
5524                         }
5525 #endif
5526 #ifdef INET6
5527                 case AF_INET6:
5528                         {
5529                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5530                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5531                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5532                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5533                                         stc.loopback_scope = 1;
5534                                         stc.local_scope = 0;
5535                                         stc.site_scope = 1;
5536                                         stc.ipv4_scope = 1;
5537                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5538                                         /*
5539                                          * If the new destination is a
5540                                          * LINK_LOCAL we must have common
5541                                          * both site and local scope. Don't
5542                                          * set local scope though since we
5543                                          * must depend on the source to be
5544                                          * added implicitly. We cannot
5545                                          * assure just because we share one
5546                                          * link that all links are common.
5547                                          */
5548                                         stc.local_scope = 0;
5549                                         stc.site_scope = 1;
5550                                         stc.ipv4_scope = 1;
5551                                         /*
5552                                          * we start counting for the private
5553                                          * address stuff at 1. since the
5554                                          * link local we source from won't
5555                                          * show up in our scoped count.
5556                                          */
5557                                         cnt_inits_to = 1;
5558                                         /*
5559                                          * pull out the scope_id from
5560                                          * incoming pkt
5561                                          */
5562                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5563                                         /*
5564                                          * If the new destination is
5565                                          * SITE_LOCAL then we must have site
5566                                          * scope in common.
5567                                          */
5568                                         stc.site_scope = 1;
5569                                 }
5570                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5571                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5572                                 break;
5573                         }
5574 #endif
5575                 default:
5576                         /* TSNH */
5577                         goto do_a_abort;
5578                         break;
5579                 }
5580         } else {
5581                 /* set the scope per the existing tcb */
5582
5583 #ifdef INET6
5584                 struct sctp_nets *lnet;
5585
5586 #endif
5587
5588                 stc.loopback_scope = asoc->loopback_scope;
5589                 stc.ipv4_scope = asoc->ipv4_local_scope;
5590                 stc.site_scope = asoc->site_scope;
5591                 stc.local_scope = asoc->local_scope;
5592 #ifdef INET6
5593                 /* Why do we not consider IPv4 LL addresses? */
5594                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5595                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5596                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5597                                         /*
5598                                          * if we have a LL address, start
5599                                          * counting at 1.
5600                                          */
5601                                         cnt_inits_to = 1;
5602                                 }
5603                         }
5604                 }
5605 #endif
5606                 /* use the net pointer */
5607                 to = (struct sockaddr *)&net->ro._l_addr;
5608                 switch (to->sa_family) {
5609 #ifdef INET
5610                 case AF_INET:
5611                         sin = (struct sockaddr_in *)to;
5612                         stc.address[0] = sin->sin_addr.s_addr;
5613                         stc.address[1] = 0;
5614                         stc.address[2] = 0;
5615                         stc.address[3] = 0;
5616                         stc.addr_type = SCTP_IPV4_ADDRESS;
5617                         if (net->src_addr_selected == 0) {
5618                                 /*
5619                                  * strange case here, the INIT should have
5620                                  * did the selection.
5621                                  */
5622                                 net->ro._s_addr = sctp_source_address_selection(inp,
5623                                     stcb, (sctp_route_t *) & net->ro,
5624                                     net, 0, vrf_id);
5625                                 if (net->ro._s_addr == NULL)
5626                                         return;
5627
5628                                 net->src_addr_selected = 1;
5629
5630                         }
5631                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5632                         stc.laddress[1] = 0;
5633                         stc.laddress[2] = 0;
5634                         stc.laddress[3] = 0;
5635                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5636                         /* scope_id is only for v6 */
5637                         stc.scope_id = 0;
5638                         break;
5639 #endif
5640 #ifdef INET6
5641                 case AF_INET6:
5642                         sin6 = (struct sockaddr_in6 *)to;
5643                         memcpy(&stc.address, &sin6->sin6_addr,
5644                             sizeof(struct in6_addr));
5645                         stc.addr_type = SCTP_IPV6_ADDRESS;
5646                         stc.scope_id = sin6->sin6_scope_id;
5647                         if (net->src_addr_selected == 0) {
5648                                 /*
5649                                  * strange case here, the INIT should have
5650                                  * done the selection.
5651                                  */
5652                                 net->ro._s_addr = sctp_source_address_selection(inp,
5653                                     stcb, (sctp_route_t *) & net->ro,
5654                                     net, 0, vrf_id);
5655                                 if (net->ro._s_addr == NULL)
5656                                         return;
5657
5658                                 net->src_addr_selected = 1;
5659                         }
5660                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5661                             sizeof(struct in6_addr));
5662                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5663                         break;
5664 #endif
5665                 }
5666         }
5667         /* Now lets put the SCTP header in place */
5668         initack = mtod(m, struct sctp_init_ack_chunk *);
5669         /* Save it off for quick ref */
5670         stc.peers_vtag = init_chk->init.initiate_tag;
5671         /* who are we */
5672         memcpy(stc.identification, SCTP_VERSION_STRING,
5673             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5674         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5675         /* now the chunk header */
5676         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5677         initack->ch.chunk_flags = 0;
5678         /* fill in later from mbuf we build */
5679         initack->ch.chunk_length = 0;
5680         /* place in my tag */
5681         if ((asoc != NULL) &&
5682             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5683             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5684             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5685                 /* re-use the v-tags and init-seq here */
5686                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5687                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5688         } else {
5689                 uint32_t vtag, itsn;
5690
5691                 if (hold_inp_lock) {
5692                         SCTP_INP_INCR_REF(inp);
5693                         SCTP_INP_RUNLOCK(inp);
5694                 }
5695                 if (asoc) {
5696                         atomic_add_int(&asoc->refcnt, 1);
5697                         SCTP_TCB_UNLOCK(stcb);
5698         new_tag:
5699                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5700                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5701                                 /*
5702                                  * Got a duplicate vtag on some guy behind a
5703                                  * nat make sure we don't use it.
5704                                  */
5705                                 goto new_tag;
5706                         }
5707                         initack->init.initiate_tag = htonl(vtag);
5708                         /* get a TSN to use too */
5709                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5710                         initack->init.initial_tsn = htonl(itsn);
5711                         SCTP_TCB_LOCK(stcb);
5712                         atomic_add_int(&asoc->refcnt, -1);
5713                 } else {
5714                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5715                         initack->init.initiate_tag = htonl(vtag);
5716                         /* get a TSN to use too */
5717                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5718                 }
5719                 if (hold_inp_lock) {
5720                         SCTP_INP_RLOCK(inp);
5721                         SCTP_INP_DECR_REF(inp);
5722                 }
5723         }
5724         /* save away my tag to */
5725         stc.my_vtag = initack->init.initiate_tag;
5726
5727         /* set up some of the credits. */
5728         so = inp->sctp_socket;
5729         if (so == NULL) {
5730                 /* memory problem */
5731                 sctp_m_freem(m);
5732                 return;
5733         } else {
5734                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5735         }
5736         /* set what I want */
5737         his_limit = ntohs(init_chk->init.num_inbound_streams);
5738         /* choose what I want */
5739         if (asoc != NULL) {
5740                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5741                         i_want = asoc->streamoutcnt;
5742                 } else {
5743                         i_want = inp->sctp_ep.pre_open_stream_count;
5744                 }
5745         } else {
5746                 i_want = inp->sctp_ep.pre_open_stream_count;
5747         }
5748         if (his_limit < i_want) {
5749                 /* I Want more :< */
5750                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5751         } else {
5752                 /* I can have what I want :> */
5753                 initack->init.num_outbound_streams = htons(i_want);
5754         }
5755         /* tell him his limt. */
5756         initack->init.num_inbound_streams =
5757             htons(inp->sctp_ep.max_open_streams_intome);
5758
5759         /* adaptation layer indication parameter */
5760         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5761         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5762         ali->ph.param_length = htons(sizeof(*ali));
5763         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5764         SCTP_BUF_LEN(m) += sizeof(*ali);
5765         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5766
5767         /* ECN parameter */
5768         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5769             (inp->sctp_ecn_enable == 1)) {
5770                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5771                 ecn->ph.param_length = htons(sizeof(*ecn));
5772                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5773
5774                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5775                     sizeof(*ecn));
5776         } else {
5777                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5778         }
5779         /* And now tell the peer we do  pr-sctp */
5780         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5781         prsctp->ph.param_length = htons(sizeof(*prsctp));
5782         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5783         if (nat_friendly) {
5784                 /* Add NAT friendly parameter */
5785                 struct sctp_paramhdr *ph;
5786
5787                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5788                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5789                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5790                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5791         }
5792         /* And now tell the peer we do all the extensions */
5793         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5794         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5795         num_ext = 0;
5796         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5797         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5798         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5799         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5800         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5801         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5802                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5803         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5804                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5805         p_len = sizeof(*pr_supported) + num_ext;
5806         pr_supported->ph.param_length = htons(p_len);
5807         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5808         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5809
5810         /* add authentication parameters */
5811         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5812                 struct sctp_auth_random *randp;
5813                 struct sctp_auth_hmac_algo *hmacs;
5814                 struct sctp_auth_chunk_list *chunks;
5815                 uint16_t random_len;
5816
5817                 /* generate and add RANDOM parameter */
5818                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5819                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5820                 randp->ph.param_type = htons(SCTP_RANDOM);
5821                 p_len = sizeof(*randp) + random_len;
5822                 randp->ph.param_length = htons(p_len);
5823                 SCTP_READ_RANDOM(randp->random_data, random_len);
5824                 /* zero out any padding required */
5825                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5826                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5827
5828                 /* add HMAC_ALGO parameter */
5829                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5830                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5831                     (uint8_t *) hmacs->hmac_ids);
5832                 if (p_len > 0) {
5833                         p_len += sizeof(*hmacs);
5834                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5835                         hmacs->ph.param_length = htons(p_len);
5836                         /* zero out any padding required */
5837                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5838                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5839                 }
5840                 /* add CHUNKS parameter */
5841                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5842                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5843                     chunks->chunk_types);
5844                 if (p_len > 0) {
5845                         p_len += sizeof(*chunks);
5846                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5847                         chunks->ph.param_length = htons(p_len);
5848                         /* zero out any padding required */
5849                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5850                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5851                 }
5852         }
5853         m_at = m;
5854         /* now the addresses */
5855         {
5856                 struct sctp_scoping scp;
5857
5858                 /*
5859                  * To optimize this we could put the scoping stuff into a
5860                  * structure and remove the individual uint8's from the stc
5861                  * structure. Then we could just sifa in the address within
5862                  * the stc.. but for now this is a quick hack to get the
5863                  * address stuff teased apart.
5864                  */
5865                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5866                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5867                 scp.loopback_scope = stc.loopback_scope;
5868                 scp.ipv4_local_scope = stc.ipv4_scope;
5869                 scp.local_scope = stc.local_scope;
5870                 scp.site_scope = stc.site_scope;
5871                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5872         }
5873
5874         /* tack on the operational error if present */
5875         if (op_err) {
5876                 struct mbuf *ol;
5877                 int llen;
5878
5879                 llen = 0;
5880                 ol = op_err;
5881
5882                 while (ol) {
5883                         llen += SCTP_BUF_LEN(ol);
5884                         ol = SCTP_BUF_NEXT(ol);
5885                 }
5886                 if (llen % 4) {
5887                         /* must add a pad to the param */
5888                         uint32_t cpthis = 0;
5889                         int padlen;
5890
5891                         padlen = 4 - (llen % 4);
5892                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5893                 }
5894                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5895                         m_at = SCTP_BUF_NEXT(m_at);
5896                 }
5897                 SCTP_BUF_NEXT(m_at) = op_err;
5898                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5899                         m_at = SCTP_BUF_NEXT(m_at);
5900                 }
5901         }
5902         /* pre-calulate the size and update pkt header and chunk header */
5903         p_len = 0;
5904         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5905                 p_len += SCTP_BUF_LEN(m_tmp);
5906                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5907                         /* m_tmp should now point to last one */
5908                         break;
5909                 }
5910         }
5911
5912         /* Now we must build a cookie */
5913         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5914         if (m_cookie == NULL) {
5915                 /* memory problem */
5916                 sctp_m_freem(m);
5917                 return;
5918         }
5919         /* Now append the cookie to the end and update the space/size */
5920         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5921
5922         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5923                 p_len += SCTP_BUF_LEN(m_tmp);
5924                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5925                         /* m_tmp should now point to last one */
5926                         mp_last = m_tmp;
5927                         break;
5928                 }
5929         }
5930         /*
5931          * Place in the size, but we don't include the last pad (if any) in
5932          * the INIT-ACK.
5933          */
5934         initack->ch.chunk_length = htons(p_len);
5935
5936         /*
5937          * Time to sign the cookie, we don't sign over the cookie signature
5938          * though thus we set trailer.
5939          */
5940         (void)sctp_hmac_m(SCTP_HMAC,
5941             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5942             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5943             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5944         /*
5945          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5946          * here since the timer will drive a retranmission.
5947          */
5948         padval = p_len % 4;
5949         if ((padval) && (mp_last)) {
5950                 /* see my previous comments on mp_last */
5951                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
5952                         /* Houston we have a problem, no space */
5953                         sctp_m_freem(m);
5954                         return;
5955                 }
5956         }
5957         if (stc.loopback_scope) {
5958                 over_addr = (union sctp_sockstore *)dst;
5959         } else {
5960                 over_addr = NULL;
5961         }
5962
5963         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5964             0, 0,
5965             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5966             port, over_addr,
5967             use_mflowid, mflowid,
5968             SCTP_SO_NOT_LOCKED);
5969         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5970 }
5971
5972
5973 static void
5974 sctp_prune_prsctp(struct sctp_tcb *stcb,
5975     struct sctp_association *asoc,
5976     struct sctp_sndrcvinfo *srcv,
5977     int dataout)
5978 {
5979         int freed_spc = 0;
5980         struct sctp_tmit_chunk *chk, *nchk;
5981
5982         SCTP_TCB_LOCK_ASSERT(stcb);
5983         if ((asoc->peer_supports_prsctp) &&
5984             (asoc->sent_queue_cnt_removeable > 0)) {
5985                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5986                         /*
5987                          * Look for chunks marked with the PR_SCTP flag AND
5988                          * the buffer space flag. If the one being sent is
5989                          * equal or greater priority then purge the old one
5990                          * and free some space.
5991                          */
5992                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5993                                 /*
5994                                  * This one is PR-SCTP AND buffer space
5995                                  * limited type
5996                                  */
5997                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
5998                                         /*
5999                                          * Lower numbers equates to higher
6000                                          * priority so if the one we are
6001                                          * looking at has a larger or equal
6002                                          * priority we want to drop the data
6003                                          * and NOT retransmit it.
6004                                          */
6005                                         if (chk->data) {
6006                                                 /*
6007                                                  * We release the book_size
6008                                                  * if the mbuf is here
6009                                                  */
6010                                                 int ret_spc;
6011                                                 uint8_t sent;
6012
6013                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6014                                                         sent = 1;
6015                                                 else
6016                                                         sent = 0;
6017                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6018                                                     sent,
6019                                                     SCTP_SO_LOCKED);
6020                                                 freed_spc += ret_spc;
6021                                                 if (freed_spc >= dataout) {
6022                                                         return;
6023                                                 }
6024                                         }       /* if chunk was present */
6025                                 }       /* if of sufficent priority */
6026                         }       /* if chunk has enabled */
6027                 }               /* tailqforeach */
6028
6029                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6030                         /* Here we must move to the sent queue and mark */
6031                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6032                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6033                                         if (chk->data) {
6034                                                 /*
6035                                                  * We release the book_size
6036                                                  * if the mbuf is here
6037                                                  */
6038                                                 int ret_spc;
6039
6040                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6041                                                     0, SCTP_SO_LOCKED);
6042
6043                                                 freed_spc += ret_spc;
6044                                                 if (freed_spc >= dataout) {
6045                                                         return;
6046                                                 }
6047                                         }       /* end if chk->data */
6048                                 }       /* end if right class */
6049                         }       /* end if chk pr-sctp */
6050                 }               /* tailqforeachsafe (chk) */
6051         }                       /* if enabled in asoc */
6052 }
6053
6054 int
6055 sctp_get_frag_point(struct sctp_tcb *stcb,
6056     struct sctp_association *asoc)
6057 {
6058         int siz, ovh;
6059
6060         /*
6061          * For endpoints that have both v6 and v4 addresses we must reserve
6062          * room for the ipv6 header, for those that are only dealing with V4
6063          * we use a larger frag point.
6064          */
6065         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6066                 ovh = SCTP_MED_OVERHEAD;
6067         } else {
6068                 ovh = SCTP_MED_V4_OVERHEAD;
6069         }
6070
6071         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6072                 siz = asoc->smallest_mtu - ovh;
6073         else
6074                 siz = (stcb->asoc.sctp_frag_point - ovh);
6075         /*
6076          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6077          */
6078         /* A data chunk MUST fit in a cluster */
6079         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6080         /* } */
6081
6082         /* adjust for an AUTH chunk if DATA requires auth */
6083         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6084                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6085
6086         if (siz % 4) {
6087                 /* make it an even word boundary please */
6088                 siz -= (siz % 4);
6089         }
6090         return (siz);
6091 }
6092
6093 static void
6094 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6095 {
6096         sp->pr_sctp_on = 0;
6097         /*
6098          * We assume that the user wants PR_SCTP_TTL if the user provides a
6099          * positive lifetime but does not specify any PR_SCTP policy. This
6100          * is a BAD assumption and causes problems at least with the
6101          * U-Vancovers MPI folks. I will change this to be no policy means
6102          * NO PR-SCTP.
6103          */
6104         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6105                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6106                 sp->pr_sctp_on = 1;
6107         } else {
6108                 return;
6109         }
6110         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6111         case CHUNK_FLAGS_PR_SCTP_BUF:
6112                 /*
6113                  * Time to live is a priority stored in tv_sec when doing
6114                  * the buffer drop thing.
6115                  */
6116                 sp->ts.tv_sec = sp->timetolive;
6117                 sp->ts.tv_usec = 0;
6118                 break;
6119         case CHUNK_FLAGS_PR_SCTP_TTL:
6120                 {
6121                         struct timeval tv;
6122
6123                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6124                         tv.tv_sec = sp->timetolive / 1000;
6125                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6126                         /*
6127                          * TODO sctp_constants.h needs alternative time
6128                          * macros when _KERNEL is undefined.
6129                          */
6130                         timevaladd(&sp->ts, &tv);
6131                 }
6132                 break;
6133         case CHUNK_FLAGS_PR_SCTP_RTX:
6134                 /*
6135                  * Time to live is a the number or retransmissions stored in
6136                  * tv_sec.
6137                  */
6138                 sp->ts.tv_sec = sp->timetolive;
6139                 sp->ts.tv_usec = 0;
6140                 break;
6141         default:
6142                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6143                     "Unknown PR_SCTP policy %u.\n",
6144                     PR_SCTP_POLICY(sp->sinfo_flags));
6145                 break;
6146         }
6147 }
6148
6149 static int
6150 sctp_msg_append(struct sctp_tcb *stcb,
6151     struct sctp_nets *net,
6152     struct mbuf *m,
6153     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6154 {
6155         int error = 0;
6156         struct mbuf *at;
6157         struct sctp_stream_queue_pending *sp = NULL;
6158         struct sctp_stream_out *strm;
6159
6160         /*
6161          * Given an mbuf chain, put it into the association send queue and
6162          * place it on the wheel
6163          */
6164         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6165                 /* Invalid stream number */
6166                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6167                 error = EINVAL;
6168                 goto out_now;
6169         }
6170         if ((stcb->asoc.stream_locked) &&
6171             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6172                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6173                 error = EINVAL;
6174                 goto out_now;
6175         }
6176         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6177         /* Now can we send this? */
6178         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6179             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6180             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6181             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6182                 /* got data while shutting down */
6183                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6184                 error = ECONNRESET;
6185                 goto out_now;
6186         }
6187         sctp_alloc_a_strmoq(stcb, sp);
6188         if (sp == NULL) {
6189                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6190                 error = ENOMEM;
6191                 goto out_now;
6192         }
6193         sp->sinfo_flags = srcv->sinfo_flags;
6194         sp->timetolive = srcv->sinfo_timetolive;
6195         sp->ppid = srcv->sinfo_ppid;
6196         sp->context = srcv->sinfo_context;
6197         sp->strseq = 0;
6198         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6199                 sp->net = net;
6200                 atomic_add_int(&sp->net->ref_count, 1);
6201         } else {
6202                 sp->net = NULL;
6203         }
6204         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6205         sp->stream = srcv->sinfo_stream;
6206         sp->msg_is_complete = 1;
6207         sp->sender_all_done = 1;
6208         sp->some_taken = 0;
6209         sp->data = m;
6210         sp->tail_mbuf = NULL;
6211         sctp_set_prsctp_policy(sp);
6212         /*
6213          * We could in theory (for sendall) sifa the length in, but we would
6214          * still have to hunt through the chain since we need to setup the
6215          * tail_mbuf
6216          */
6217         sp->length = 0;
6218         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6219                 if (SCTP_BUF_NEXT(at) == NULL)
6220                         sp->tail_mbuf = at;
6221                 sp->length += SCTP_BUF_LEN(at);
6222         }
6223         if (srcv->sinfo_keynumber_valid) {
6224                 sp->auth_keyid = srcv->sinfo_keynumber;
6225         } else {
6226                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6227         }
6228         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6229                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6230                 sp->holds_key_ref = 1;
6231         }
6232         if (hold_stcb_lock == 0) {
6233                 SCTP_TCB_SEND_LOCK(stcb);
6234         }
6235         sctp_snd_sb_alloc(stcb, sp->length);
6236         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6237         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6238         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6239                 sp->strseq = strm->next_sequence_sent;
6240                 strm->next_sequence_sent++;
6241         }
6242         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6243         m = NULL;
6244         if (hold_stcb_lock == 0) {
6245                 SCTP_TCB_SEND_UNLOCK(stcb);
6246         }
6247 out_now:
6248         if (m) {
6249                 sctp_m_freem(m);
6250         }
6251         return (error);
6252 }
6253
6254
6255 static struct mbuf *
6256 sctp_copy_mbufchain(struct mbuf *clonechain,
6257     struct mbuf *outchain,
6258     struct mbuf **endofchain,
6259     int can_take_mbuf,
6260     int sizeofcpy,
6261     uint8_t copy_by_ref)
6262 {
6263         struct mbuf *m;
6264         struct mbuf *appendchain;
6265         caddr_t cp;
6266         int len;
6267
6268         if (endofchain == NULL) {
6269                 /* error */
6270 error_out:
6271                 if (outchain)
6272                         sctp_m_freem(outchain);
6273                 return (NULL);
6274         }
6275         if (can_take_mbuf) {
6276                 appendchain = clonechain;
6277         } else {
6278                 if (!copy_by_ref &&
6279                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6280                     ) {
6281                         /* Its not in a cluster */
6282                         if (*endofchain == NULL) {
6283                                 /* lets get a mbuf cluster */
6284                                 if (outchain == NULL) {
6285                                         /* This is the general case */
6286                         new_mbuf:
6287                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6288                                         if (outchain == NULL) {
6289                                                 goto error_out;
6290                                         }
6291                                         SCTP_BUF_LEN(outchain) = 0;
6292                                         *endofchain = outchain;
6293                                         /* get the prepend space */
6294                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6295                                 } else {
6296                                         /*
6297                                          * We really should not get a NULL
6298                                          * in endofchain
6299                                          */
6300                                         /* find end */
6301                                         m = outchain;
6302                                         while (m) {
6303                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6304                                                         *endofchain = m;
6305                                                         break;
6306                                                 }
6307                                                 m = SCTP_BUF_NEXT(m);
6308                                         }
6309                                         /* sanity */
6310                                         if (*endofchain == NULL) {
6311                                                 /*
6312                                                  * huh, TSNH XXX maybe we
6313                                                  * should panic
6314                                                  */
6315                                                 sctp_m_freem(outchain);
6316                                                 goto new_mbuf;
6317                                         }
6318                                 }
6319                                 /* get the new end of length */
6320                                 len = M_TRAILINGSPACE(*endofchain);
6321                         } else {
6322                                 /* how much is left at the end? */
6323                                 len = M_TRAILINGSPACE(*endofchain);
6324                         }
6325                         /* Find the end of the data, for appending */
6326                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6327
6328                         /* Now lets copy it out */
6329                         if (len >= sizeofcpy) {
6330                                 /* It all fits, copy it in */
6331                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6332                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6333                         } else {
6334                                 /* fill up the end of the chain */
6335                                 if (len > 0) {
6336                                         m_copydata(clonechain, 0, len, cp);
6337                                         SCTP_BUF_LEN((*endofchain)) += len;
6338                                         /* now we need another one */
6339                                         sizeofcpy -= len;
6340                                 }
6341                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6342                                 if (m == NULL) {
6343                                         /* We failed */
6344                                         goto error_out;
6345                                 }
6346                                 SCTP_BUF_NEXT((*endofchain)) = m;
6347                                 *endofchain = m;
6348                                 cp = mtod((*endofchain), caddr_t);
6349                                 m_copydata(clonechain, len, sizeofcpy, cp);
6350                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6351                         }
6352                         return (outchain);
6353                 } else {
6354                         /* copy the old fashion way */
6355                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6356 #ifdef SCTP_MBUF_LOGGING
6357                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6358                                 struct mbuf *mat;
6359
6360                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6361                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6362                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6363                                         }
6364                                 }
6365                         }
6366 #endif
6367                 }
6368         }
6369         if (appendchain == NULL) {
6370                 /* error */
6371                 if (outchain)
6372                         sctp_m_freem(outchain);
6373                 return (NULL);
6374         }
6375         if (outchain) {
6376                 /* tack on to the end */
6377                 if (*endofchain != NULL) {
6378                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6379                 } else {
6380                         m = outchain;
6381                         while (m) {
6382                                 if (SCTP_BUF_NEXT(m) == NULL) {
6383                                         SCTP_BUF_NEXT(m) = appendchain;
6384                                         break;
6385                                 }
6386                                 m = SCTP_BUF_NEXT(m);
6387                         }
6388                 }
6389                 /*
6390                  * save off the end and update the end-chain postion
6391                  */
6392                 m = appendchain;
6393                 while (m) {
6394                         if (SCTP_BUF_NEXT(m) == NULL) {
6395                                 *endofchain = m;
6396                                 break;
6397                         }
6398                         m = SCTP_BUF_NEXT(m);
6399                 }
6400                 return (outchain);
6401         } else {
6402                 /* save off the end and update the end-chain postion */
6403                 m = appendchain;
6404                 while (m) {
6405                         if (SCTP_BUF_NEXT(m) == NULL) {
6406                                 *endofchain = m;
6407                                 break;
6408                         }
6409                         m = SCTP_BUF_NEXT(m);
6410                 }
6411                 return (appendchain);
6412         }
6413 }
6414
6415 int
6416 sctp_med_chunk_output(struct sctp_inpcb *inp,
6417     struct sctp_tcb *stcb,
6418     struct sctp_association *asoc,
6419     int *num_out,
6420     int *reason_code,
6421     int control_only, int from_where,
6422     struct timeval *now, int *now_filled, int frag_point, int so_locked
6423 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6424     SCTP_UNUSED
6425 #endif
6426 );
6427
6428 static void
6429 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6430     uint32_t val SCTP_UNUSED)
6431 {
6432         struct sctp_copy_all *ca;
6433         struct mbuf *m;
6434         int ret = 0;
6435         int added_control = 0;
6436         int un_sent, do_chunk_output = 1;
6437         struct sctp_association *asoc;
6438         struct sctp_nets *net;
6439
6440         ca = (struct sctp_copy_all *)ptr;
6441         if (ca->m == NULL) {
6442                 return;
6443         }
6444         if (ca->inp != inp) {
6445                 /* TSNH */
6446                 return;
6447         }
6448         if ((ca->m) && ca->sndlen) {
6449                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6450                 if (m == NULL) {
6451                         /* can't copy so we are done */
6452                         ca->cnt_failed++;
6453                         return;
6454                 }
6455 #ifdef SCTP_MBUF_LOGGING
6456                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6457                         struct mbuf *mat;
6458
6459                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6460                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6461                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6462                                 }
6463                         }
6464                 }
6465 #endif
6466         } else {
6467                 m = NULL;
6468         }
6469         SCTP_TCB_LOCK_ASSERT(stcb);
6470         if (stcb->asoc.alternate) {
6471                 net = stcb->asoc.alternate;
6472         } else {
6473                 net = stcb->asoc.primary_destination;
6474         }
6475         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6476                 /* Abort this assoc with m as the user defined reason */
6477                 if (m) {
6478                         struct sctp_paramhdr *ph;
6479
6480                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6481                         if (m) {
6482                                 ph = mtod(m, struct sctp_paramhdr *);
6483                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6484                                 ph->param_length = htons(ca->sndlen);
6485                         }
6486                         /*
6487                          * We add one here to keep the assoc from
6488                          * dis-appearing on us.
6489                          */
6490                         atomic_add_int(&stcb->asoc.refcnt, 1);
6491                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6492                         /*
6493                          * sctp_abort_an_association calls sctp_free_asoc()
6494                          * free association will NOT free it since we
6495                          * incremented the refcnt .. we do this to prevent
6496                          * it being freed and things getting tricky since we
6497                          * could end up (from free_asoc) calling inpcb_free
6498                          * which would get a recursive lock call to the
6499                          * iterator lock.. But as a consequence of that the
6500                          * stcb will return to us un-locked.. since
6501                          * free_asoc returns with either no TCB or the TCB
6502                          * unlocked, we must relock.. to unlock in the
6503                          * iterator timer :-0
6504                          */
6505                         SCTP_TCB_LOCK(stcb);
6506                         atomic_add_int(&stcb->asoc.refcnt, -1);
6507                         goto no_chunk_output;
6508                 }
6509         } else {
6510                 if (m) {
6511                         ret = sctp_msg_append(stcb, net, m,
6512                             &ca->sndrcv, 1);
6513                 }
6514                 asoc = &stcb->asoc;
6515                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6516                         /* shutdown this assoc */
6517                         int cnt;
6518
6519                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6520
6521                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6522                             TAILQ_EMPTY(&asoc->sent_queue) &&
6523                             (cnt == 0)) {
6524                                 if (asoc->locked_on_sending) {
6525                                         goto abort_anyway;
6526                                 }
6527                                 /*
6528                                  * there is nothing queued to send, so I'm
6529                                  * done...
6530                                  */
6531                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6532                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6533                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6534                                         /*
6535                                          * only send SHUTDOWN the first time
6536                                          * through
6537                                          */
6538                                         sctp_send_shutdown(stcb, net);
6539                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6540                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6541                                         }
6542                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6543                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6544                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6545                                             net);
6546                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6547                                             asoc->primary_destination);
6548                                         added_control = 1;
6549                                         do_chunk_output = 0;
6550                                 }
6551                         } else {
6552                                 /*
6553                                  * we still got (or just got) data to send,
6554                                  * so set SHUTDOWN_PENDING
6555                                  */
6556                                 /*
6557                                  * XXX sockets draft says that SCTP_EOF
6558                                  * should be sent with no data.  currently,
6559                                  * we will allow user data to be sent first
6560                                  * and move to SHUTDOWN-PENDING
6561                                  */
6562                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6563                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6564                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6565                                         if (asoc->locked_on_sending) {
6566                                                 /*
6567                                                  * Locked to send out the
6568                                                  * data
6569                                                  */
6570                                                 struct sctp_stream_queue_pending *sp;
6571
6572                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6573                                                 if (sp) {
6574                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6575                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6576                                                 }
6577                                         }
6578                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6579                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6580                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6581                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6582                                 abort_anyway:
6583                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6584                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6585                                                     NULL, SCTP_SO_NOT_LOCKED);
6586                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6587                                                 goto no_chunk_output;
6588                                         }
6589                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6590                                             asoc->primary_destination);
6591                                 }
6592                         }
6593
6594                 }
6595         }
6596         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6597             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6598
6599         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6600             (stcb->asoc.total_flight > 0) &&
6601             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6602             ) {
6603                 do_chunk_output = 0;
6604         }
6605         if (do_chunk_output)
6606                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6607         else if (added_control) {
6608                 int num_out = 0, reason = 0, now_filled = 0;
6609                 struct timeval now;
6610                 int frag_point;
6611
6612                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6613                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6614                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6615         }
6616 no_chunk_output:
6617         if (ret) {
6618                 ca->cnt_failed++;
6619         } else {
6620                 ca->cnt_sent++;
6621         }
6622 }
6623
6624 static void
6625 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6626 {
6627         struct sctp_copy_all *ca;
6628
6629         ca = (struct sctp_copy_all *)ptr;
6630         /*
6631          * Do a notify here? Kacheong suggests that the notify be done at
6632          * the send time.. so you would push up a notification if any send
6633          * failed. Don't know if this is feasable since the only failures we
6634          * have is "memory" related and if you cannot get an mbuf to send
6635          * the data you surely can't get an mbuf to send up to notify the
6636          * user you can't send the data :->
6637          */
6638
6639         /* now free everything */
6640         sctp_m_freem(ca->m);
6641         SCTP_FREE(ca, SCTP_M_COPYAL);
6642 }
6643
6644
6645 #define MC_ALIGN(m, len) do {                                           \
6646         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6647 } while (0)
6648
6649
6650
6651 static struct mbuf *
6652 sctp_copy_out_all(struct uio *uio, int len)
6653 {
6654         struct mbuf *ret, *at;
6655         int left, willcpy, cancpy, error;
6656
6657         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6658         if (ret == NULL) {
6659                 /* TSNH */
6660                 return (NULL);
6661         }
6662         left = len;
6663         SCTP_BUF_LEN(ret) = 0;
6664         /* save space for the data chunk header */
6665         cancpy = M_TRAILINGSPACE(ret);
6666         willcpy = min(cancpy, left);
6667         at = ret;
6668         while (left > 0) {
6669                 /* Align data to the end */
6670                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6671                 if (error) {
6672         err_out_now:
6673                         sctp_m_freem(at);
6674                         return (NULL);
6675                 }
6676                 SCTP_BUF_LEN(at) = willcpy;
6677                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6678                 left -= willcpy;
6679                 if (left > 0) {
6680                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6681                         if (SCTP_BUF_NEXT(at) == NULL) {
6682                                 goto err_out_now;
6683                         }
6684                         at = SCTP_BUF_NEXT(at);
6685                         SCTP_BUF_LEN(at) = 0;
6686                         cancpy = M_TRAILINGSPACE(at);
6687                         willcpy = min(cancpy, left);
6688                 }
6689         }
6690         return (ret);
6691 }
6692
6693 static int
6694 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6695     struct sctp_sndrcvinfo *srcv)
6696 {
6697         int ret;
6698         struct sctp_copy_all *ca;
6699
6700         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6701             SCTP_M_COPYAL);
6702         if (ca == NULL) {
6703                 sctp_m_freem(m);
6704                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6705                 return (ENOMEM);
6706         }
6707         memset(ca, 0, sizeof(struct sctp_copy_all));
6708
6709         ca->inp = inp;
6710         if (srcv) {
6711                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6712         }
6713         /*
6714          * take off the sendall flag, it would be bad if we failed to do
6715          * this :-0
6716          */
6717         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6718         /* get length and mbuf chain */
6719         if (uio) {
6720                 ca->sndlen = uio->uio_resid;
6721                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6722                 if (ca->m == NULL) {
6723                         SCTP_FREE(ca, SCTP_M_COPYAL);
6724                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6725                         return (ENOMEM);
6726                 }
6727         } else {
6728                 /* Gather the length of the send */
6729                 struct mbuf *mat;
6730
6731                 mat = m;
6732                 ca->sndlen = 0;
6733                 while (m) {
6734                         ca->sndlen += SCTP_BUF_LEN(m);
6735                         m = SCTP_BUF_NEXT(m);
6736                 }
6737                 ca->m = mat;
6738         }
6739         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6740             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6741             SCTP_ASOC_ANY_STATE,
6742             (void *)ca, 0,
6743             sctp_sendall_completes, inp, 1);
6744         if (ret) {
6745                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6746                 SCTP_FREE(ca, SCTP_M_COPYAL);
6747                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6748                 return (EFAULT);
6749         }
6750         return (0);
6751 }
6752
6753
6754 void
6755 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6756 {
6757         struct sctp_tmit_chunk *chk, *nchk;
6758
6759         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6760                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6761                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6762                         if (chk->data) {
6763                                 sctp_m_freem(chk->data);
6764                                 chk->data = NULL;
6765                         }
6766                         asoc->ctrl_queue_cnt--;
6767                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6768                 }
6769         }
6770 }
6771
6772 void
6773 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6774 {
6775         struct sctp_association *asoc;
6776         struct sctp_tmit_chunk *chk, *nchk;
6777         struct sctp_asconf_chunk *acp;
6778
6779         asoc = &stcb->asoc;
6780         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6781                 /* find SCTP_ASCONF chunk in queue */
6782                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6783                         if (chk->data) {
6784                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6785                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6786                                         /* Not Acked yet */
6787                                         break;
6788                                 }
6789                         }
6790                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6791                         if (chk->data) {
6792                                 sctp_m_freem(chk->data);
6793                                 chk->data = NULL;
6794                         }
6795                         asoc->ctrl_queue_cnt--;
6796                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6797                 }
6798         }
6799 }
6800
6801
6802 static void
6803 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6804     struct sctp_association *asoc,
6805     struct sctp_tmit_chunk **data_list,
6806     int bundle_at,
6807     struct sctp_nets *net)
6808 {
6809         int i;
6810         struct sctp_tmit_chunk *tp1;
6811
6812         for (i = 0; i < bundle_at; i++) {
6813                 /* off of the send queue */
6814                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6815                 asoc->send_queue_cnt--;
6816                 if (i > 0) {
6817                         /*
6818                          * Any chunk NOT 0 you zap the time chunk 0 gets
6819                          * zapped or set based on if a RTO measurment is
6820                          * needed.
6821                          */
6822                         data_list[i]->do_rtt = 0;
6823                 }
6824                 /* record time */
6825                 data_list[i]->sent_rcv_time = net->last_sent_time;
6826                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6827                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6828                 if (data_list[i]->whoTo == NULL) {
6829                         data_list[i]->whoTo = net;
6830                         atomic_add_int(&net->ref_count, 1);
6831                 }
6832                 /* on to the sent queue */
6833                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6834                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6835                         struct sctp_tmit_chunk *tpp;
6836
6837                         /* need to move back */
6838         back_up_more:
6839                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6840                         if (tpp == NULL) {
6841                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6842                                 goto all_done;
6843                         }
6844                         tp1 = tpp;
6845                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6846                                 goto back_up_more;
6847                         }
6848                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6849                 } else {
6850                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6851                             data_list[i],
6852                             sctp_next);
6853                 }
6854 all_done:
6855                 /* This does not lower until the cum-ack passes it */
6856                 asoc->sent_queue_cnt++;
6857                 if ((asoc->peers_rwnd <= 0) &&
6858                     (asoc->total_flight == 0) &&
6859                     (bundle_at == 1)) {
6860                         /* Mark the chunk as being a window probe */
6861                         SCTP_STAT_INCR(sctps_windowprobed);
6862                 }
6863 #ifdef SCTP_AUDITING_ENABLED
6864                 sctp_audit_log(0xC2, 3);
6865 #endif
6866                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6867                 data_list[i]->snd_count = 1;
6868                 data_list[i]->rec.data.chunk_was_revoked = 0;
6869                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6870                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6871                             data_list[i]->whoTo->flight_size,
6872                             data_list[i]->book_size,
6873                             (uintptr_t) data_list[i]->whoTo,
6874                             data_list[i]->rec.data.TSN_seq);
6875                 }
6876                 sctp_flight_size_increase(data_list[i]);
6877                 sctp_total_flight_increase(stcb, data_list[i]);
6878                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6879                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6880                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6881                 }
6882                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6883                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6884                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6885                         /* SWS sender side engages */
6886                         asoc->peers_rwnd = 0;
6887                 }
6888         }
6889         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6890                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6891         }
6892 }
6893
6894 static void
6895 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6896 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6897     SCTP_UNUSED
6898 #endif
6899 )
6900 {
6901         struct sctp_tmit_chunk *chk, *nchk;
6902
6903         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6904                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6905                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6906                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6907                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6908                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6909                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6910                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6911                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6912                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6913                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6914                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6915                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6916                         /* Stray chunks must be cleaned up */
6917         clean_up_anyway:
6918                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6919                         if (chk->data) {
6920                                 sctp_m_freem(chk->data);
6921                                 chk->data = NULL;
6922                         }
6923                         asoc->ctrl_queue_cnt--;
6924                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6925                                 asoc->fwd_tsn_cnt--;
6926                         sctp_free_a_chunk(stcb, chk, so_locked);
6927                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6928                         /* special handling, we must look into the param */
6929                         if (chk != asoc->str_reset) {
6930                                 goto clean_up_anyway;
6931                         }
6932                 }
6933         }
6934 }
6935
6936
6937 static int
6938 sctp_can_we_split_this(struct sctp_tcb *stcb,
6939     uint32_t length,
6940     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6941 {
6942         /*
6943          * Make a decision on if I should split a msg into multiple parts.
6944          * This is only asked of incomplete messages.
6945          */
6946         if (eeor_on) {
6947                 /*
6948                  * If we are doing EEOR we need to always send it if its the
6949                  * entire thing, since it might be all the guy is putting in
6950                  * the hopper.
6951                  */
6952                 if (goal_mtu >= length) {
6953                         /*-
6954                          * If we have data outstanding,
6955                          * we get another chance when the sack
6956                          * arrives to transmit - wait for more data
6957                          */
6958                         if (stcb->asoc.total_flight == 0) {
6959                                 /*
6960                                  * If nothing is in flight, we zero the
6961                                  * packet counter.
6962                                  */
6963                                 return (length);
6964                         }
6965                         return (0);
6966
6967                 } else {
6968                         /* You can fill the rest */
6969                         return (goal_mtu);
6970                 }
6971         }
6972         /*-
6973          * For those strange folk that make the send buffer
6974          * smaller than our fragmentation point, we can't
6975          * get a full msg in so we have to allow splitting.
6976          */
6977         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6978                 return (length);
6979         }
6980         if ((length <= goal_mtu) ||
6981             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6982                 /* Sub-optimial residual don't split in non-eeor mode. */
6983                 return (0);
6984         }
6985         /*
6986          * If we reach here length is larger than the goal_mtu. Do we wish
6987          * to split it for the sake of packet putting together?
6988          */
6989         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6990                 /* Its ok to split it */
6991                 return (min(goal_mtu, frag_point));
6992         }
6993         /* Nope, can't split */
6994         return (0);
6995
6996 }
6997
6998 static uint32_t
6999 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7000     struct sctp_stream_out *strq,
7001     uint32_t goal_mtu,
7002     uint32_t frag_point,
7003     int *locked,
7004     int *giveup,
7005     int eeor_mode,
7006     int *bail,
7007     int so_locked
7008 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7009     SCTP_UNUSED
7010 #endif
7011 )
7012 {
7013         /* Move from the stream to the send_queue keeping track of the total */
7014         struct sctp_association *asoc;
7015         struct sctp_stream_queue_pending *sp;
7016         struct sctp_tmit_chunk *chk;
7017         struct sctp_data_chunk *dchkh;
7018         uint32_t to_move, length;
7019         uint8_t rcv_flags = 0;
7020         uint8_t some_taken;
7021         uint8_t send_lock_up = 0;
7022
7023         SCTP_TCB_LOCK_ASSERT(stcb);
7024         asoc = &stcb->asoc;
7025 one_more_time:
7026         /* sa_ignore FREED_MEMORY */
7027         sp = TAILQ_FIRST(&strq->outqueue);
7028         if (sp == NULL) {
7029                 *locked = 0;
7030                 if (send_lock_up == 0) {
7031                         SCTP_TCB_SEND_LOCK(stcb);
7032                         send_lock_up = 1;
7033                 }
7034                 sp = TAILQ_FIRST(&strq->outqueue);
7035                 if (sp) {
7036                         goto one_more_time;
7037                 }
7038                 if (strq->last_msg_incomplete) {
7039                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7040                             strq->stream_no,
7041                             strq->last_msg_incomplete);
7042                         strq->last_msg_incomplete = 0;
7043                 }
7044                 to_move = 0;
7045                 if (send_lock_up) {
7046                         SCTP_TCB_SEND_UNLOCK(stcb);
7047                         send_lock_up = 0;
7048                 }
7049                 goto out_of;
7050         }
7051         if ((sp->msg_is_complete) && (sp->length == 0)) {
7052                 if (sp->sender_all_done) {
7053                         /*
7054                          * We are doing differed cleanup. Last time through
7055                          * when we took all the data the sender_all_done was
7056                          * not set.
7057                          */
7058                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7059                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7060                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7061                                     sp->sender_all_done,
7062                                     sp->length,
7063                                     sp->msg_is_complete,
7064                                     sp->put_last_out,
7065                                     send_lock_up);
7066                         }
7067                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7068                                 SCTP_TCB_SEND_LOCK(stcb);
7069                                 send_lock_up = 1;
7070                         }
7071                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7072                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7073                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7074                         if (sp->net) {
7075                                 sctp_free_remote_addr(sp->net);
7076                                 sp->net = NULL;
7077                         }
7078                         if (sp->data) {
7079                                 sctp_m_freem(sp->data);
7080                                 sp->data = NULL;
7081                         }
7082                         sctp_free_a_strmoq(stcb, sp, so_locked);
7083                         /* we can't be locked to it */
7084                         *locked = 0;
7085                         stcb->asoc.locked_on_sending = NULL;
7086                         if (send_lock_up) {
7087                                 SCTP_TCB_SEND_UNLOCK(stcb);
7088                                 send_lock_up = 0;
7089                         }
7090                         /* back to get the next msg */
7091                         goto one_more_time;
7092                 } else {
7093                         /*
7094                          * sender just finished this but still holds a
7095                          * reference
7096                          */
7097                         *locked = 1;
7098                         *giveup = 1;
7099                         to_move = 0;
7100                         goto out_of;
7101                 }
7102         } else {
7103                 /* is there some to get */
7104                 if (sp->length == 0) {
7105                         /* no */
7106                         *locked = 1;
7107                         *giveup = 1;
7108                         to_move = 0;
7109                         goto out_of;
7110                 } else if (sp->discard_rest) {
7111                         if (send_lock_up == 0) {
7112                                 SCTP_TCB_SEND_LOCK(stcb);
7113                                 send_lock_up = 1;
7114                         }
7115                         /* Whack down the size */
7116                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7117                         if ((stcb->sctp_socket != NULL) && \
7118                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7119                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7120                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7121                         }
7122                         if (sp->data) {
7123                                 sctp_m_freem(sp->data);
7124                                 sp->data = NULL;
7125                                 sp->tail_mbuf = NULL;
7126                         }
7127                         sp->length = 0;
7128                         sp->some_taken = 1;
7129                         *locked = 1;
7130                         *giveup = 1;
7131                         to_move = 0;
7132                         goto out_of;
7133                 }
7134         }
7135         some_taken = sp->some_taken;
7136         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7137                 sp->msg_is_complete = 1;
7138         }
7139 re_look:
7140         length = sp->length;
7141         if (sp->msg_is_complete) {
7142                 /* The message is complete */
7143                 to_move = min(length, frag_point);
7144                 if (to_move == length) {
7145                         /* All of it fits in the MTU */
7146                         if (sp->some_taken) {
7147                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7148                                 sp->put_last_out = 1;
7149                         } else {
7150                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7151                                 sp->put_last_out = 1;
7152                         }
7153                 } else {
7154                         /* Not all of it fits, we fragment */
7155                         if (sp->some_taken == 0) {
7156                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7157                         }
7158                         sp->some_taken = 1;
7159                 }
7160         } else {
7161                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7162                 if (to_move) {
7163                         /*-
7164                          * We use a snapshot of length in case it
7165                          * is expanding during the compare.
7166                          */
7167                         uint32_t llen;
7168
7169                         llen = length;
7170                         if (to_move >= llen) {
7171                                 to_move = llen;
7172                                 if (send_lock_up == 0) {
7173                                         /*-
7174                                          * We are taking all of an incomplete msg
7175                                          * thus we need a send lock.
7176                                          */
7177                                         SCTP_TCB_SEND_LOCK(stcb);
7178                                         send_lock_up = 1;
7179                                         if (sp->msg_is_complete) {
7180                                                 /*
7181                                                  * the sender finished the
7182                                                  * msg
7183                                                  */
7184                                                 goto re_look;
7185                                         }
7186                                 }
7187                         }
7188                         if (sp->some_taken == 0) {
7189                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7190                                 sp->some_taken = 1;
7191                         }
7192                 } else {
7193                         /* Nothing to take. */
7194                         if (sp->some_taken) {
7195                                 *locked = 1;
7196                         }
7197                         *giveup = 1;
7198                         to_move = 0;
7199                         goto out_of;
7200                 }
7201         }
7202
7203         /* If we reach here, we can copy out a chunk */
7204         sctp_alloc_a_chunk(stcb, chk);
7205         if (chk == NULL) {
7206                 /* No chunk memory */
7207                 *giveup = 1;
7208                 to_move = 0;
7209                 goto out_of;
7210         }
7211         /*
7212          * Setup for unordered if needed by looking at the user sent info
7213          * flags.
7214          */
7215         if (sp->sinfo_flags & SCTP_UNORDERED) {
7216                 rcv_flags |= SCTP_DATA_UNORDERED;
7217         }
7218         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7219             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7220                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7221         }
7222         /* clear out the chunk before setting up */
7223         memset(chk, 0, sizeof(*chk));
7224         chk->rec.data.rcv_flags = rcv_flags;
7225
7226         if (to_move >= length) {
7227                 /* we think we can steal the whole thing */
7228                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7229                         SCTP_TCB_SEND_LOCK(stcb);
7230                         send_lock_up = 1;
7231                 }
7232                 if (to_move < sp->length) {
7233                         /* bail, it changed */
7234                         goto dont_do_it;
7235                 }
7236                 chk->data = sp->data;
7237                 chk->last_mbuf = sp->tail_mbuf;
7238                 /* register the stealing */
7239                 sp->data = sp->tail_mbuf = NULL;
7240         } else {
7241                 struct mbuf *m;
7242
7243 dont_do_it:
7244                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7245                 chk->last_mbuf = NULL;
7246                 if (chk->data == NULL) {
7247                         sp->some_taken = some_taken;
7248                         sctp_free_a_chunk(stcb, chk, so_locked);
7249                         *bail = 1;
7250                         to_move = 0;
7251                         goto out_of;
7252                 }
7253 #ifdef SCTP_MBUF_LOGGING
7254                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7255                         struct mbuf *mat;
7256
7257                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7258                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7259                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7260                                 }
7261                         }
7262                 }
7263 #endif
7264                 /* Pull off the data */
7265                 m_adj(sp->data, to_move);
7266                 /* Now lets work our way down and compact it */
7267                 m = sp->data;
7268                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7269                         sp->data = SCTP_BUF_NEXT(m);
7270                         SCTP_BUF_NEXT(m) = NULL;
7271                         if (sp->tail_mbuf == m) {
7272                                 /*-
7273                                  * Freeing tail? TSNH since
7274                                  * we supposedly were taking less
7275                                  * than the sp->length.
7276                                  */
7277 #ifdef INVARIANTS
7278                                 panic("Huh, freing tail? - TSNH");
7279 #else
7280                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7281                                 sp->tail_mbuf = sp->data = NULL;
7282                                 sp->length = 0;
7283 #endif
7284
7285                         }
7286                         sctp_m_free(m);
7287                         m = sp->data;
7288                 }
7289         }
7290         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7291                 chk->copy_by_ref = 1;
7292         } else {
7293                 chk->copy_by_ref = 0;
7294         }
7295         /*
7296          * get last_mbuf and counts of mb useage This is ugly but hopefully
7297          * its only one mbuf.
7298          */
7299         if (chk->last_mbuf == NULL) {
7300                 chk->last_mbuf = chk->data;
7301                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7302                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7303                 }
7304         }
7305         if (to_move > length) {
7306                 /*- This should not happen either
7307                  * since we always lower to_move to the size
7308                  * of sp->length if its larger.
7309                  */
7310 #ifdef INVARIANTS
7311                 panic("Huh, how can to_move be larger?");
7312 #else
7313                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7314                 sp->length = 0;
7315 #endif
7316         } else {
7317                 atomic_subtract_int(&sp->length, to_move);
7318         }
7319         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7320                 /* Not enough room for a chunk header, get some */
7321                 struct mbuf *m;
7322
7323                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7324                 if (m == NULL) {
7325                         /*
7326                          * we're in trouble here. _PREPEND below will free
7327                          * all the data if there is no leading space, so we
7328                          * must put the data back and restore.
7329                          */
7330                         if (send_lock_up == 0) {
7331                                 SCTP_TCB_SEND_LOCK(stcb);
7332                                 send_lock_up = 1;
7333                         }
7334                         if (chk->data == NULL) {
7335                                 /* unsteal the data */
7336                                 sp->data = chk->data;
7337                                 sp->tail_mbuf = chk->last_mbuf;
7338                         } else {
7339                                 struct mbuf *m_tmp;
7340
7341                                 /* reassemble the data */
7342                                 m_tmp = sp->data;
7343                                 sp->data = chk->data;
7344                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7345                         }
7346                         sp->some_taken = some_taken;
7347                         atomic_add_int(&sp->length, to_move);
7348                         chk->data = NULL;
7349                         *bail = 1;
7350                         sctp_free_a_chunk(stcb, chk, so_locked);
7351                         to_move = 0;
7352                         goto out_of;
7353                 } else {
7354                         SCTP_BUF_LEN(m) = 0;
7355                         SCTP_BUF_NEXT(m) = chk->data;
7356                         chk->data = m;
7357                         M_ALIGN(chk->data, 4);
7358                 }
7359         }
7360         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7361         if (chk->data == NULL) {
7362                 /* HELP, TSNH since we assured it would not above? */
7363 #ifdef INVARIANTS
7364                 panic("prepend failes HELP?");
7365 #else
7366                 SCTP_PRINTF("prepend fails HELP?\n");
7367                 sctp_free_a_chunk(stcb, chk, so_locked);
7368 #endif
7369                 *bail = 1;
7370                 to_move = 0;
7371                 goto out_of;
7372         }
7373         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7374         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7375         chk->book_size_scale = 0;
7376         chk->sent = SCTP_DATAGRAM_UNSENT;
7377
7378         chk->flags = 0;
7379         chk->asoc = &stcb->asoc;
7380         chk->pad_inplace = 0;
7381         chk->no_fr_allowed = 0;
7382         chk->rec.data.stream_seq = sp->strseq;
7383         chk->rec.data.stream_number = sp->stream;
7384         chk->rec.data.payloadtype = sp->ppid;
7385         chk->rec.data.context = sp->context;
7386         chk->rec.data.doing_fast_retransmit = 0;
7387
7388         chk->rec.data.timetodrop = sp->ts;
7389         chk->flags = sp->act_flags;
7390
7391         if (sp->net) {
7392                 chk->whoTo = sp->net;
7393                 atomic_add_int(&chk->whoTo->ref_count, 1);
7394         } else
7395                 chk->whoTo = NULL;
7396
7397         if (sp->holds_key_ref) {
7398                 chk->auth_keyid = sp->auth_keyid;
7399                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7400                 chk->holds_key_ref = 1;
7401         }
7402         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7403         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7404                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7405                     (uintptr_t) stcb, sp->length,
7406                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7407                     chk->rec.data.TSN_seq);
7408         }
7409         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7410         /*
7411          * Put the rest of the things in place now. Size was done earlier in
7412          * previous loop prior to padding.
7413          */
7414
7415 #ifdef SCTP_ASOCLOG_OF_TSNS
7416         SCTP_TCB_LOCK_ASSERT(stcb);
7417         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7418                 asoc->tsn_out_at = 0;
7419                 asoc->tsn_out_wrapped = 1;
7420         }
7421         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7422         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7423         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7424         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7425         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7426         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7427         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7428         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7429         asoc->tsn_out_at++;
7430 #endif
7431
7432         dchkh->ch.chunk_type = SCTP_DATA;
7433         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7434         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7435         dchkh->dp.stream_id = htons(strq->stream_no);
7436         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7437         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7438         dchkh->ch.chunk_length = htons(chk->send_size);
7439         /* Now advance the chk->send_size by the actual pad needed. */
7440         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7441                 /* need a pad */
7442                 struct mbuf *lm;
7443                 int pads;
7444
7445                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7446                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7447                         chk->pad_inplace = 1;
7448                 }
7449                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7450                         /* pad added an mbuf */
7451                         chk->last_mbuf = lm;
7452                 }
7453                 chk->send_size += pads;
7454         }
7455         /* We only re-set the policy if it is on */
7456         if (sp->pr_sctp_on) {
7457                 sctp_set_prsctp_policy(sp);
7458                 asoc->pr_sctp_cnt++;
7459                 chk->pr_sctp_on = 1;
7460         } else {
7461                 chk->pr_sctp_on = 0;
7462         }
7463         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7464                 /* All done pull and kill the message */
7465                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7466                 if (sp->put_last_out == 0) {
7467                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7468                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7469                             sp->sender_all_done,
7470                             sp->length,
7471                             sp->msg_is_complete,
7472                             sp->put_last_out,
7473                             send_lock_up);
7474                 }
7475                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7476                         SCTP_TCB_SEND_LOCK(stcb);
7477                         send_lock_up = 1;
7478                 }
7479                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7480                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7481                 if (sp->net) {
7482                         sctp_free_remote_addr(sp->net);
7483                         sp->net = NULL;
7484                 }
7485                 if (sp->data) {
7486                         sctp_m_freem(sp->data);
7487                         sp->data = NULL;
7488                 }
7489                 sctp_free_a_strmoq(stcb, sp, so_locked);
7490
7491                 /* we can't be locked to it */
7492                 *locked = 0;
7493                 stcb->asoc.locked_on_sending = NULL;
7494         } else {
7495                 /* more to go, we are locked */
7496                 *locked = 1;
7497         }
7498         asoc->chunks_on_out_queue++;
7499         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7500         asoc->send_queue_cnt++;
7501 out_of:
7502         if (send_lock_up) {
7503                 SCTP_TCB_SEND_UNLOCK(stcb);
7504         }
7505         return (to_move);
7506 }
7507
7508
7509 static void
7510 sctp_fill_outqueue(struct sctp_tcb *stcb,
7511     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7512 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7513     SCTP_UNUSED
7514 #endif
7515 )
7516 {
7517         struct sctp_association *asoc;
7518         struct sctp_stream_out *strq;
7519         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7520         int locked, giveup;
7521
7522         SCTP_TCB_LOCK_ASSERT(stcb);
7523         asoc = &stcb->asoc;
7524         switch (net->ro._l_addr.sa.sa_family) {
7525 #ifdef INET
7526         case AF_INET:
7527                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7528                 break;
7529 #endif
7530 #ifdef INET6
7531         case AF_INET6:
7532                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7533                 break;
7534 #endif
7535         default:
7536                 /* TSNH */
7537                 goal_mtu = net->mtu;
7538                 break;
7539         }
7540         /* Need an allowance for the data chunk header too */
7541         goal_mtu -= sizeof(struct sctp_data_chunk);
7542
7543         /* must make even word boundary */
7544         goal_mtu &= 0xfffffffc;
7545         if (asoc->locked_on_sending) {
7546                 /* We are stuck on one stream until the message completes. */
7547                 strq = asoc->locked_on_sending;
7548                 locked = 1;
7549         } else {
7550                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7551                 locked = 0;
7552         }
7553         while ((goal_mtu > 0) && strq) {
7554                 giveup = 0;
7555                 bail = 0;
7556                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7557                     &giveup, eeor_mode, &bail, so_locked);
7558                 if (moved_how_much)
7559                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7560
7561                 if (locked) {
7562                         asoc->locked_on_sending = strq;
7563                         if ((moved_how_much == 0) || (giveup) || bail)
7564                                 /* no more to move for now */
7565                                 break;
7566                 } else {
7567                         asoc->locked_on_sending = NULL;
7568                         if ((giveup) || bail) {
7569                                 break;
7570                         }
7571                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7572                         if (strq == NULL) {
7573                                 break;
7574                         }
7575                 }
7576                 total_moved += moved_how_much;
7577                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7578                 goal_mtu &= 0xfffffffc;
7579         }
7580         if (bail)
7581                 *quit_now = 1;
7582
7583         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7584
7585         if (total_moved == 0) {
7586                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7587                     (net == stcb->asoc.primary_destination)) {
7588                         /* ran dry for primary network net */
7589                         SCTP_STAT_INCR(sctps_primary_randry);
7590                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7591                         /* ran dry with CMT on */
7592                         SCTP_STAT_INCR(sctps_cmt_randry);
7593                 }
7594         }
7595 }
7596
7597 void
7598 sctp_fix_ecn_echo(struct sctp_association *asoc)
7599 {
7600         struct sctp_tmit_chunk *chk;
7601
7602         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7603                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7604                         chk->sent = SCTP_DATAGRAM_UNSENT;
7605                 }
7606         }
7607 }
7608
7609 void
7610 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7611 {
7612         struct sctp_association *asoc;
7613         struct sctp_tmit_chunk *chk;
7614         struct sctp_stream_queue_pending *sp;
7615         unsigned int i;
7616
7617         if (net == NULL) {
7618                 return;
7619         }
7620         asoc = &stcb->asoc;
7621         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7622                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7623                         if (sp->net == net) {
7624                                 sctp_free_remote_addr(sp->net);
7625                                 sp->net = NULL;
7626                         }
7627                 }
7628         }
7629         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7630                 if (chk->whoTo == net) {
7631                         sctp_free_remote_addr(chk->whoTo);
7632                         chk->whoTo = NULL;
7633                 }
7634         }
7635 }
7636
7637 int
7638 sctp_med_chunk_output(struct sctp_inpcb *inp,
7639     struct sctp_tcb *stcb,
7640     struct sctp_association *asoc,
7641     int *num_out,
7642     int *reason_code,
7643     int control_only, int from_where,
7644     struct timeval *now, int *now_filled, int frag_point, int so_locked
7645 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7646     SCTP_UNUSED
7647 #endif
7648 )
7649 {
7650         /*
7651          * Ok this is the generic chunk service queue. we must do the
7652          * following: - Service the stream queue that is next, moving any
7653          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7654          * LAST to the out queue in one pass) and assigning TSN's - Check to
7655          * see if the cwnd/rwnd allows any output, if so we go ahead and
7656          * fomulate and send the low level chunks. Making sure to combine
7657          * any control in the control chunk queue also.
7658          */
7659         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7660         struct mbuf *outchain, *endoutchain;
7661         struct sctp_tmit_chunk *chk, *nchk;
7662
7663         /* temp arrays for unlinking */
7664         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7665         int no_fragmentflg, error;
7666         unsigned int max_rwnd_per_dest, max_send_per_dest;
7667         int one_chunk, hbflag, skip_data_for_this_net;
7668         int asconf, cookie, no_out_cnt;
7669         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7670         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7671         int tsns_sent = 0;
7672         uint32_t auth_offset = 0;
7673         struct sctp_auth_chunk *auth = NULL;
7674         uint16_t auth_keyid;
7675         int override_ok = 1;
7676         int skip_fill_up = 0;
7677         int data_auth_reqd = 0;
7678
7679         /*
7680          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7681          * destination.
7682          */
7683         int quit_now = 0;
7684
7685         *num_out = 0;
7686         auth_keyid = stcb->asoc.authinfo.active_keyid;
7687
7688         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7689             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7690             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7691                 eeor_mode = 1;
7692         } else {
7693                 eeor_mode = 0;
7694         }
7695         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7696         /*
7697          * First lets prime the pump. For each destination, if there is room
7698          * in the flight size, attempt to pull an MTU's worth out of the
7699          * stream queues into the general send_queue
7700          */
7701 #ifdef SCTP_AUDITING_ENABLED
7702         sctp_audit_log(0xC2, 2);
7703 #endif
7704         SCTP_TCB_LOCK_ASSERT(stcb);
7705         hbflag = 0;
7706         if ((control_only) || (asoc->stream_reset_outstanding))
7707                 no_data_chunks = 1;
7708         else
7709                 no_data_chunks = 0;
7710
7711         /* Nothing to possible to send? */
7712         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7713             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7714             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7715             TAILQ_EMPTY(&asoc->send_queue) &&
7716             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7717 nothing_to_send:
7718                 *reason_code = 9;
7719                 return (0);
7720         }
7721         if (asoc->peers_rwnd == 0) {
7722                 /* No room in peers rwnd */
7723                 *reason_code = 1;
7724                 if (asoc->total_flight > 0) {
7725                         /* we are allowed one chunk in flight */
7726                         no_data_chunks = 1;
7727                 }
7728         }
7729         if (stcb->asoc.ecn_echo_cnt_onq) {
7730                 /* Record where a sack goes, if any */
7731                 if (no_data_chunks &&
7732                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7733                         /* Nothing but ECNe to send - we don't do that */
7734                         goto nothing_to_send;
7735                 }
7736                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7737                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7738                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7739                                 sack_goes_to = chk->whoTo;
7740                                 break;
7741                         }
7742                 }
7743         }
7744         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7745         if (stcb->sctp_socket)
7746                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7747         else
7748                 max_send_per_dest = 0;
7749         if (no_data_chunks == 0) {
7750                 /* How many non-directed chunks are there? */
7751                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7752                         if (chk->whoTo == NULL) {
7753                                 /*
7754                                  * We already have non-directed chunks on
7755                                  * the queue, no need to do a fill-up.
7756                                  */
7757                                 skip_fill_up = 1;
7758                                 break;
7759                         }
7760                 }
7761
7762         }
7763         if ((no_data_chunks == 0) &&
7764             (skip_fill_up == 0) &&
7765             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7766                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7767                         /*
7768                          * This for loop we are in takes in each net, if
7769                          * its's got space in cwnd and has data sent to it
7770                          * (when CMT is off) then it calls
7771                          * sctp_fill_outqueue for the net. This gets data on
7772                          * the send queue for that network.
7773                          *
7774                          * In sctp_fill_outqueue TSN's are assigned and data is
7775                          * copied out of the stream buffers. Note mostly
7776                          * copy by reference (we hope).
7777                          */
7778                         net->window_probe = 0;
7779                         if ((net != stcb->asoc.alternate) &&
7780                             ((net->dest_state & SCTP_ADDR_PF) ||
7781                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7782                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7783                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7784                                         sctp_log_cwnd(stcb, net, 1,
7785                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7786                                 }
7787                                 continue;
7788                         }
7789                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7790                             (net->flight_size == 0)) {
7791                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7792                         }
7793                         if (net->flight_size >= net->cwnd) {
7794                                 /* skip this network, no room - can't fill */
7795                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7796                                         sctp_log_cwnd(stcb, net, 3,
7797                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7798                                 }
7799                                 continue;
7800                         }
7801                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7802                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7803                         }
7804                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7805                         if (quit_now) {
7806                                 /* memory alloc failure */
7807                                 no_data_chunks = 1;
7808                                 break;
7809                         }
7810                 }
7811         }
7812         /* now service each destination and send out what we can for it */
7813         /* Nothing to send? */
7814         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7815             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7816             TAILQ_EMPTY(&asoc->send_queue)) {
7817                 *reason_code = 8;
7818                 return (0);
7819         }
7820         if (asoc->sctp_cmt_on_off > 0) {
7821                 /* get the last start point */
7822                 start_at = asoc->last_net_cmt_send_started;
7823                 if (start_at == NULL) {
7824                         /* null so to beginning */
7825                         start_at = TAILQ_FIRST(&asoc->nets);
7826                 } else {
7827                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7828                         if (start_at == NULL) {
7829                                 start_at = TAILQ_FIRST(&asoc->nets);
7830                         }
7831                 }
7832                 asoc->last_net_cmt_send_started = start_at;
7833         } else {
7834                 start_at = TAILQ_FIRST(&asoc->nets);
7835         }
7836         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7837                 if (chk->whoTo == NULL) {
7838                         if (asoc->alternate) {
7839                                 chk->whoTo = asoc->alternate;
7840                         } else {
7841                                 chk->whoTo = asoc->primary_destination;
7842                         }
7843                         atomic_add_int(&chk->whoTo->ref_count, 1);
7844                 }
7845         }
7846         old_start_at = NULL;
7847 again_one_more_time:
7848         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7849                 /* how much can we send? */
7850                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7851                 if (old_start_at && (old_start_at == net)) {
7852                         /* through list ocmpletely. */
7853                         break;
7854                 }
7855                 tsns_sent = 0xa;
7856                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7857                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7858                     (net->flight_size >= net->cwnd)) {
7859                         /*
7860                          * Nothing on control or asconf and flight is full,
7861                          * we can skip even in the CMT case.
7862                          */
7863                         continue;
7864                 }
7865                 bundle_at = 0;
7866                 endoutchain = outchain = NULL;
7867                 no_fragmentflg = 1;
7868                 one_chunk = 0;
7869                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7870                         skip_data_for_this_net = 1;
7871                 } else {
7872                         skip_data_for_this_net = 0;
7873                 }
7874                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7875                         /*
7876                          * if we have a route and an ifp check to see if we
7877                          * have room to send to this guy
7878                          */
7879                         struct ifnet *ifp;
7880
7881                         ifp = net->ro.ro_rt->rt_ifp;
7882                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7883                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7884                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7885                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7886                                 }
7887                                 continue;
7888                         }
7889                 }
7890                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7891 #ifdef INET
7892                 case AF_INET:
7893                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7894                         break;
7895 #endif
7896 #ifdef INET6
7897                 case AF_INET6:
7898                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7899                         break;
7900 #endif
7901                 default:
7902                         /* TSNH */
7903                         mtu = net->mtu;
7904                         break;
7905                 }
7906                 mx_mtu = mtu;
7907                 to_out = 0;
7908                 if (mtu > asoc->peers_rwnd) {
7909                         if (asoc->total_flight > 0) {
7910                                 /* We have a packet in flight somewhere */
7911                                 r_mtu = asoc->peers_rwnd;
7912                         } else {
7913                                 /* We are always allowed to send one MTU out */
7914                                 one_chunk = 1;
7915                                 r_mtu = mtu;
7916                         }
7917                 } else {
7918                         r_mtu = mtu;
7919                 }
7920                 /************************/
7921                 /* ASCONF transmission */
7922                 /************************/
7923                 /* Now first lets go through the asconf queue */
7924                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7925                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7926                                 continue;
7927                         }
7928                         if (chk->whoTo == NULL) {
7929                                 if (asoc->alternate == NULL) {
7930                                         if (asoc->primary_destination != net) {
7931                                                 break;
7932                                         }
7933                                 } else {
7934                                         if (asoc->alternate != net) {
7935                                                 break;
7936                                         }
7937                                 }
7938                         } else {
7939                                 if (chk->whoTo != net) {
7940                                         break;
7941                                 }
7942                         }
7943                         if (chk->data == NULL) {
7944                                 break;
7945                         }
7946                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7947                             chk->sent != SCTP_DATAGRAM_RESEND) {
7948                                 break;
7949                         }
7950                         /*
7951                          * if no AUTH is yet included and this chunk
7952                          * requires it, make sure to account for it.  We
7953                          * don't apply the size until the AUTH chunk is
7954                          * actually added below in case there is no room for
7955                          * this chunk. NOTE: we overload the use of "omtu"
7956                          * here
7957                          */
7958                         if ((auth == NULL) &&
7959                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7960                             stcb->asoc.peer_auth_chunks)) {
7961                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7962                         } else
7963                                 omtu = 0;
7964                         /* Here we do NOT factor the r_mtu */
7965                         if ((chk->send_size < (int)(mtu - omtu)) ||
7966                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7967                                 /*
7968                                  * We probably should glom the mbuf chain
7969                                  * from the chk->data for control but the
7970                                  * problem is it becomes yet one more level
7971                                  * of tracking to do if for some reason
7972                                  * output fails. Then I have got to
7973                                  * reconstruct the merged control chain.. el
7974                                  * yucko.. for now we take the easy way and
7975                                  * do the copy
7976                                  */
7977                                 /*
7978                                  * Add an AUTH chunk, if chunk requires it
7979                                  * save the offset into the chain for AUTH
7980                                  */
7981                                 if ((auth == NULL) &&
7982                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7983                                     stcb->asoc.peer_auth_chunks))) {
7984                                         outchain = sctp_add_auth_chunk(outchain,
7985                                             &endoutchain,
7986                                             &auth,
7987                                             &auth_offset,
7988                                             stcb,
7989                                             chk->rec.chunk_id.id);
7990                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7991                                 }
7992                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7993                                     (int)chk->rec.chunk_id.can_take_data,
7994                                     chk->send_size, chk->copy_by_ref);
7995                                 if (outchain == NULL) {
7996                                         *reason_code = 8;
7997                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
7998                                         return (ENOMEM);
7999                                 }
8000                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8001                                 /* update our MTU size */
8002                                 if (mtu > (chk->send_size + omtu))
8003                                         mtu -= (chk->send_size + omtu);
8004                                 else
8005                                         mtu = 0;
8006                                 to_out += (chk->send_size + omtu);
8007                                 /* Do clear IP_DF ? */
8008                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8009                                         no_fragmentflg = 0;
8010                                 }
8011                                 if (chk->rec.chunk_id.can_take_data)
8012                                         chk->data = NULL;
8013                                 /*
8014                                  * set hb flag since we can use these for
8015                                  * RTO
8016                                  */
8017                                 hbflag = 1;
8018                                 asconf = 1;
8019                                 /*
8020                                  * should sysctl this: don't bundle data
8021                                  * with ASCONF since it requires AUTH
8022                                  */
8023                                 no_data_chunks = 1;
8024                                 chk->sent = SCTP_DATAGRAM_SENT;
8025                                 if (chk->whoTo == NULL) {
8026                                         chk->whoTo = net;
8027                                         atomic_add_int(&net->ref_count, 1);
8028                                 }
8029                                 chk->snd_count++;
8030                                 if (mtu == 0) {
8031                                         /*
8032                                          * Ok we are out of room but we can
8033                                          * output without effecting the
8034                                          * flight size since this little guy
8035                                          * is a control only packet.
8036                                          */
8037                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8038                                         /*
8039                                          * do NOT clear the asconf flag as
8040                                          * it is used to do appropriate
8041                                          * source address selection.
8042                                          */
8043                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8044                                             (struct sockaddr *)&net->ro._l_addr,
8045                                             outchain, auth_offset, auth,
8046                                             stcb->asoc.authinfo.active_keyid,
8047                                             no_fragmentflg, 0, asconf,
8048                                             inp->sctp_lport, stcb->rport,
8049                                             htonl(stcb->asoc.peer_vtag),
8050                                             net->port, NULL,
8051                                             0, 0,
8052                                             so_locked))) {
8053                                                 if (error == ENOBUFS) {
8054                                                         asoc->ifp_had_enobuf = 1;
8055                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8056                                                 }
8057                                                 if (from_where == 0) {
8058                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8059                                                 }
8060                                                 if (*now_filled == 0) {
8061                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8062                                                         *now_filled = 1;
8063                                                         *now = net->last_sent_time;
8064                                                 } else {
8065                                                         net->last_sent_time = *now;
8066                                                 }
8067                                                 hbflag = 0;
8068                                                 /* error, could not output */
8069                                                 if (error == EHOSTUNREACH) {
8070                                                         /*
8071                                                          * Destination went
8072                                                          * unreachable
8073                                                          * during this send
8074                                                          */
8075                                                         sctp_move_chunks_from_net(stcb, net);
8076                                                 }
8077                                                 *reason_code = 7;
8078                                                 continue;
8079                                         } else
8080                                                 asoc->ifp_had_enobuf = 0;
8081                                         if (*now_filled == 0) {
8082                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8083                                                 *now_filled = 1;
8084                                                 *now = net->last_sent_time;
8085                                         } else {
8086                                                 net->last_sent_time = *now;
8087                                         }
8088                                         hbflag = 0;
8089                                         /*
8090                                          * increase the number we sent, if a
8091                                          * cookie is sent we don't tell them
8092                                          * any was sent out.
8093                                          */
8094                                         outchain = endoutchain = NULL;
8095                                         auth = NULL;
8096                                         auth_offset = 0;
8097                                         if (!no_out_cnt)
8098                                                 *num_out += ctl_cnt;
8099                                         /* recalc a clean slate and setup */
8100                                         switch (net->ro._l_addr.sa.sa_family) {
8101 #ifdef INET
8102                                         case AF_INET:
8103                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8104                                                 break;
8105 #endif
8106 #ifdef INET6
8107                                         case AF_INET6:
8108                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8109                                                 break;
8110 #endif
8111                                         default:
8112                                                 /* TSNH */
8113                                                 mtu = net->mtu;
8114                                                 break;
8115                                         }
8116                                         to_out = 0;
8117                                         no_fragmentflg = 1;
8118                                 }
8119                         }
8120                 }
8121                 /************************/
8122                 /* Control transmission */
8123                 /************************/
8124                 /* Now first lets go through the control queue */
8125                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8126                         if ((sack_goes_to) &&
8127                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8128                             (chk->whoTo != sack_goes_to)) {
8129                                 /*
8130                                  * if we have a sack in queue, and we are
8131                                  * looking at an ecn echo that is NOT queued
8132                                  * to where the sack is going..
8133                                  */
8134                                 if (chk->whoTo == net) {
8135                                         /*
8136                                          * Don't transmit it to where its
8137                                          * going (current net)
8138                                          */
8139                                         continue;
8140                                 } else if (sack_goes_to == net) {
8141                                         /*
8142                                          * But do transmit it to this
8143                                          * address
8144                                          */
8145                                         goto skip_net_check;
8146                                 }
8147                         }
8148                         if (chk->whoTo == NULL) {
8149                                 if (asoc->alternate == NULL) {
8150                                         if (asoc->primary_destination != net) {
8151                                                 continue;
8152                                         }
8153                                 } else {
8154                                         if (asoc->alternate != net) {
8155                                                 continue;
8156                                         }
8157                                 }
8158                         } else {
8159                                 if (chk->whoTo != net) {
8160                                         continue;
8161                                 }
8162                         }
8163         skip_net_check:
8164                         if (chk->data == NULL) {
8165                                 continue;
8166                         }
8167                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8168                                 /*
8169                                  * It must be unsent. Cookies and ASCONF's
8170                                  * hang around but there timers will force
8171                                  * when marked for resend.
8172                                  */
8173                                 continue;
8174                         }
8175                         /*
8176                          * if no AUTH is yet included and this chunk
8177                          * requires it, make sure to account for it.  We
8178                          * don't apply the size until the AUTH chunk is
8179                          * actually added below in case there is no room for
8180                          * this chunk. NOTE: we overload the use of "omtu"
8181                          * here
8182                          */
8183                         if ((auth == NULL) &&
8184                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8185                             stcb->asoc.peer_auth_chunks)) {
8186                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8187                         } else
8188                                 omtu = 0;
8189                         /* Here we do NOT factor the r_mtu */
8190                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8191                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8192                                 /*
8193                                  * We probably should glom the mbuf chain
8194                                  * from the chk->data for control but the
8195                                  * problem is it becomes yet one more level
8196                                  * of tracking to do if for some reason
8197                                  * output fails. Then I have got to
8198                                  * reconstruct the merged control chain.. el
8199                                  * yucko.. for now we take the easy way and
8200                                  * do the copy
8201                                  */
8202                                 /*
8203                                  * Add an AUTH chunk, if chunk requires it
8204                                  * save the offset into the chain for AUTH
8205                                  */
8206                                 if ((auth == NULL) &&
8207                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8208                                     stcb->asoc.peer_auth_chunks))) {
8209                                         outchain = sctp_add_auth_chunk(outchain,
8210                                             &endoutchain,
8211                                             &auth,
8212                                             &auth_offset,
8213                                             stcb,
8214                                             chk->rec.chunk_id.id);
8215                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8216                                 }
8217                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8218                                     (int)chk->rec.chunk_id.can_take_data,
8219                                     chk->send_size, chk->copy_by_ref);
8220                                 if (outchain == NULL) {
8221                                         *reason_code = 8;
8222                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8223                                         return (ENOMEM);
8224                                 }
8225                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8226                                 /* update our MTU size */
8227                                 if (mtu > (chk->send_size + omtu))
8228                                         mtu -= (chk->send_size + omtu);
8229                                 else
8230                                         mtu = 0;
8231                                 to_out += (chk->send_size + omtu);
8232                                 /* Do clear IP_DF ? */
8233                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8234                                         no_fragmentflg = 0;
8235                                 }
8236                                 if (chk->rec.chunk_id.can_take_data)
8237                                         chk->data = NULL;
8238                                 /* Mark things to be removed, if needed */
8239                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8240                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8241                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8242                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8243                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8244                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8245                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8246                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8247                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8248                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8249                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8250                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8251                                                 hbflag = 1;
8252                                         }
8253                                         /* remove these chunks at the end */
8254                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8255                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8256                                                 /* turn off the timer */
8257                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8258                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8259                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8260                                                 }
8261                                         }
8262                                         ctl_cnt++;
8263                                 } else {
8264                                         /*
8265                                          * Other chunks, since they have
8266                                          * timers running (i.e. COOKIE) we
8267                                          * just "trust" that it gets sent or
8268                                          * retransmitted.
8269                                          */
8270                                         ctl_cnt++;
8271                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8272                                                 cookie = 1;
8273                                                 no_out_cnt = 1;
8274                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8275                                                 /*
8276                                                  * Increment ecne send count
8277                                                  * here this means we may be
8278                                                  * over-zealous in our
8279                                                  * counting if the send
8280                                                  * fails, but its the best
8281                                                  * place to do it (we used
8282                                                  * to do it in the queue of
8283                                                  * the chunk, but that did
8284                                                  * not tell how many times
8285                                                  * it was sent.
8286                                                  */
8287                                                 SCTP_STAT_INCR(sctps_sendecne);
8288                                         }
8289                                         chk->sent = SCTP_DATAGRAM_SENT;
8290                                         if (chk->whoTo == NULL) {
8291                                                 chk->whoTo = net;
8292                                                 atomic_add_int(&net->ref_count, 1);
8293                                         }
8294                                         chk->snd_count++;
8295                                 }
8296                                 if (mtu == 0) {
8297                                         /*
8298                                          * Ok we are out of room but we can
8299                                          * output without effecting the
8300                                          * flight size since this little guy
8301                                          * is a control only packet.
8302                                          */
8303                                         if (asconf) {
8304                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8305                                                 /*
8306                                                  * do NOT clear the asconf
8307                                                  * flag as it is used to do
8308                                                  * appropriate source
8309                                                  * address selection.
8310                                                  */
8311                                         }
8312                                         if (cookie) {
8313                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8314                                                 cookie = 0;
8315                                         }
8316                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8317                                             (struct sockaddr *)&net->ro._l_addr,
8318                                             outchain,
8319                                             auth_offset, auth,
8320                                             stcb->asoc.authinfo.active_keyid,
8321                                             no_fragmentflg, 0, asconf,
8322                                             inp->sctp_lport, stcb->rport,
8323                                             htonl(stcb->asoc.peer_vtag),
8324                                             net->port, NULL,
8325                                             0, 0,
8326                                             so_locked))) {
8327                                                 if (error == ENOBUFS) {
8328                                                         asoc->ifp_had_enobuf = 1;
8329                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8330                                                 }
8331                                                 if (from_where == 0) {
8332                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8333                                                 }
8334                                                 /* error, could not output */
8335                                                 if (hbflag) {
8336                                                         if (*now_filled == 0) {
8337                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8338                                                                 *now_filled = 1;
8339                                                                 *now = net->last_sent_time;
8340                                                         } else {
8341                                                                 net->last_sent_time = *now;
8342                                                         }
8343                                                         hbflag = 0;
8344                                                 }
8345                                                 if (error == EHOSTUNREACH) {
8346                                                         /*
8347                                                          * Destination went
8348                                                          * unreachable
8349                                                          * during this send
8350                                                          */
8351                                                         sctp_move_chunks_from_net(stcb, net);
8352                                                 }
8353                                                 *reason_code = 7;
8354                                                 continue;
8355                                         } else
8356                                                 asoc->ifp_had_enobuf = 0;
8357                                         /* Only HB or ASCONF advances time */
8358                                         if (hbflag) {
8359                                                 if (*now_filled == 0) {
8360                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8361                                                         *now_filled = 1;
8362                                                         *now = net->last_sent_time;
8363                                                 } else {
8364                                                         net->last_sent_time = *now;
8365                                                 }
8366                                                 hbflag = 0;
8367                                         }
8368                                         /*
8369                                          * increase the number we sent, if a
8370                                          * cookie is sent we don't tell them
8371                                          * any was sent out.
8372                                          */
8373                                         outchain = endoutchain = NULL;
8374                                         auth = NULL;
8375                                         auth_offset = 0;
8376                                         if (!no_out_cnt)
8377                                                 *num_out += ctl_cnt;
8378                                         /* recalc a clean slate and setup */
8379                                         switch (net->ro._l_addr.sa.sa_family) {
8380 #ifdef INET
8381                                         case AF_INET:
8382                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8383                                                 break;
8384 #endif
8385 #ifdef INET6
8386                                         case AF_INET6:
8387                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8388                                                 break;
8389 #endif
8390                                         default:
8391                                                 /* TSNH */
8392                                                 mtu = net->mtu;
8393                                                 break;
8394                                         }
8395                                         to_out = 0;
8396                                         no_fragmentflg = 1;
8397                                 }
8398                         }
8399                 }
8400                 /* JRI: if dest is in PF state, do not send data to it */
8401                 if ((asoc->sctp_cmt_on_off > 0) &&
8402                     (net != stcb->asoc.alternate) &&
8403                     (net->dest_state & SCTP_ADDR_PF)) {
8404                         goto no_data_fill;
8405                 }
8406                 if (net->flight_size >= net->cwnd) {
8407                         goto no_data_fill;
8408                 }
8409                 if ((asoc->sctp_cmt_on_off > 0) &&
8410                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8411                     (net->flight_size > max_rwnd_per_dest)) {
8412                         goto no_data_fill;
8413                 }
8414                 /*
8415                  * We need a specific accounting for the usage of the send
8416                  * buffer. We also need to check the number of messages per
8417                  * net. For now, this is better than nothing and it disabled
8418                  * by default...
8419                  */
8420                 if ((asoc->sctp_cmt_on_off > 0) &&
8421                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8422                     (max_send_per_dest > 0) &&
8423                     (net->flight_size > max_send_per_dest)) {
8424                         goto no_data_fill;
8425                 }
8426                 /*********************/
8427                 /* Data transmission */
8428                 /*********************/
8429                 /*
8430                  * if AUTH for DATA is required and no AUTH has been added
8431                  * yet, account for this in the mtu now... if no data can be
8432                  * bundled, this adjustment won't matter anyways since the
8433                  * packet will be going out...
8434                  */
8435                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8436                     stcb->asoc.peer_auth_chunks);
8437                 if (data_auth_reqd && (auth == NULL)) {
8438                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8439                 }
8440                 /* now lets add any data within the MTU constraints */
8441                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8442 #ifdef INET
8443                 case AF_INET:
8444                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8445                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8446                         else
8447                                 omtu = 0;
8448                         break;
8449 #endif
8450 #ifdef INET6
8451                 case AF_INET6:
8452                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8453                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8454                         else
8455                                 omtu = 0;
8456                         break;
8457 #endif
8458                 default:
8459                         /* TSNH */
8460                         omtu = 0;
8461                         break;
8462                 }
8463                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8464                     (skip_data_for_this_net == 0)) ||
8465                     (cookie)) {
8466                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8467                                 if (no_data_chunks) {
8468                                         /* let only control go out */
8469                                         *reason_code = 1;
8470                                         break;
8471                                 }
8472                                 if (net->flight_size >= net->cwnd) {
8473                                         /* skip this net, no room for data */
8474                                         *reason_code = 2;
8475                                         break;
8476                                 }
8477                                 if ((chk->whoTo != NULL) &&
8478                                     (chk->whoTo != net)) {
8479                                         /* Don't send the chunk on this net */
8480                                         continue;
8481                                 }
8482                                 if (asoc->sctp_cmt_on_off == 0) {
8483                                         if ((asoc->alternate) &&
8484                                             (asoc->alternate != net) &&
8485                                             (chk->whoTo == NULL)) {
8486                                                 continue;
8487                                         } else if ((net != asoc->primary_destination) &&
8488                                                     (asoc->alternate == NULL) &&
8489                                             (chk->whoTo == NULL)) {
8490                                                 continue;
8491                                         }
8492                                 }
8493                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8494                                         /*-
8495                                          * strange, we have a chunk that is
8496                                          * to big for its destination and
8497                                          * yet no fragment ok flag.
8498                                          * Something went wrong when the
8499                                          * PMTU changed...we did not mark
8500                                          * this chunk for some reason?? I
8501                                          * will fix it here by letting IP
8502                                          * fragment it for now and printing
8503                                          * a warning. This really should not
8504                                          * happen ...
8505                                          */
8506                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8507                                             chk->send_size, mtu);
8508                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8509                                 }
8510                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8511                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8512                                         struct sctp_data_chunk *dchkh;
8513
8514                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8515                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8516                                 }
8517                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8518                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8519                                         /* ok we will add this one */
8520
8521                                         /*
8522                                          * Add an AUTH chunk, if chunk
8523                                          * requires it, save the offset into
8524                                          * the chain for AUTH
8525                                          */
8526                                         if (data_auth_reqd) {
8527                                                 if (auth == NULL) {
8528                                                         outchain = sctp_add_auth_chunk(outchain,
8529                                                             &endoutchain,
8530                                                             &auth,
8531                                                             &auth_offset,
8532                                                             stcb,
8533                                                             SCTP_DATA);
8534                                                         auth_keyid = chk->auth_keyid;
8535                                                         override_ok = 0;
8536                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8537                                                 } else if (override_ok) {
8538                                                         /*
8539                                                          * use this data's
8540                                                          * keyid
8541                                                          */
8542                                                         auth_keyid = chk->auth_keyid;
8543                                                         override_ok = 0;
8544                                                 } else if (auth_keyid != chk->auth_keyid) {
8545                                                         /*
8546                                                          * different keyid,
8547                                                          * so done bundling
8548                                                          */
8549                                                         break;
8550                                                 }
8551                                         }
8552                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8553                                             chk->send_size, chk->copy_by_ref);
8554                                         if (outchain == NULL) {
8555                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8556                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8557                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8558                                                 }
8559                                                 *reason_code = 3;
8560                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8561                                                 return (ENOMEM);
8562                                         }
8563                                         /* upate our MTU size */
8564                                         /* Do clear IP_DF ? */
8565                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8566                                                 no_fragmentflg = 0;
8567                                         }
8568                                         /* unsigned subtraction of mtu */
8569                                         if (mtu > chk->send_size)
8570                                                 mtu -= chk->send_size;
8571                                         else
8572                                                 mtu = 0;
8573                                         /* unsigned subtraction of r_mtu */
8574                                         if (r_mtu > chk->send_size)
8575                                                 r_mtu -= chk->send_size;
8576                                         else
8577                                                 r_mtu = 0;
8578
8579                                         to_out += chk->send_size;
8580                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8581 #ifdef INVARIANTS
8582                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8583 #else
8584                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8585                                                     mx_mtu, to_out);
8586 #endif
8587                                         }
8588                                         chk->window_probe = 0;
8589                                         data_list[bundle_at++] = chk;
8590                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8591                                                 break;
8592                                         }
8593                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8594                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8595                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8596                                                 } else {
8597                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8598                                                 }
8599                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8600                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8601                                                         /*
8602                                                          * Count number of
8603                                                          * user msg's that
8604                                                          * were fragmented
8605                                                          * we do this by
8606                                                          * counting when we
8607                                                          * see a LAST
8608                                                          * fragment only.
8609                                                          */
8610                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8611                                         }
8612                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8613                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8614                                                         data_list[0]->window_probe = 1;
8615                                                         net->window_probe = 1;
8616                                                 }
8617                                                 break;
8618                                         }
8619                                 } else {
8620                                         /*
8621                                          * Must be sent in order of the
8622                                          * TSN's (on a network)
8623                                          */
8624                                         break;
8625                                 }
8626                         }       /* for (chunk gather loop for this net) */
8627                 }               /* if asoc.state OPEN */
8628 no_data_fill:
8629                 /* Is there something to send for this destination? */
8630                 if (outchain) {
8631                         /* We may need to start a control timer or two */
8632                         if (asconf) {
8633                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8634                                     stcb, net);
8635                                 /*
8636                                  * do NOT clear the asconf flag as it is
8637                                  * used to do appropriate source address
8638                                  * selection.
8639                                  */
8640                         }
8641                         if (cookie) {
8642                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8643                                 cookie = 0;
8644                         }
8645                         /* must start a send timer if data is being sent */
8646                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8647                                 /*
8648                                  * no timer running on this destination
8649                                  * restart it.
8650                                  */
8651                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8652                         }
8653                         /* Now send it, if there is anything to send :> */
8654                         if ((error = sctp_lowlevel_chunk_output(inp,
8655                             stcb,
8656                             net,
8657                             (struct sockaddr *)&net->ro._l_addr,
8658                             outchain,
8659                             auth_offset,
8660                             auth,
8661                             auth_keyid,
8662                             no_fragmentflg,
8663                             bundle_at,
8664                             asconf,
8665                             inp->sctp_lport, stcb->rport,
8666                             htonl(stcb->asoc.peer_vtag),
8667                             net->port, NULL,
8668                             0, 0,
8669                             so_locked))) {
8670                                 /* error, we could not output */
8671                                 if (error == ENOBUFS) {
8672                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8673                                         asoc->ifp_had_enobuf = 1;
8674                                 }
8675                                 if (from_where == 0) {
8676                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8677                                 }
8678                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8679                                 if (hbflag) {
8680                                         if (*now_filled == 0) {
8681                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8682                                                 *now_filled = 1;
8683                                                 *now = net->last_sent_time;
8684                                         } else {
8685                                                 net->last_sent_time = *now;
8686                                         }
8687                                         hbflag = 0;
8688                                 }
8689                                 if (error == EHOSTUNREACH) {
8690                                         /*
8691                                          * Destination went unreachable
8692                                          * during this send
8693                                          */
8694                                         sctp_move_chunks_from_net(stcb, net);
8695                                 }
8696                                 *reason_code = 6;
8697                                 /*-
8698                                  * I add this line to be paranoid. As far as
8699                                  * I can tell the continue, takes us back to
8700                                  * the top of the for, but just to make sure
8701                                  * I will reset these again here.
8702                                  */
8703                                 ctl_cnt = bundle_at = 0;
8704                                 continue;       /* This takes us back to the
8705                                                  * for() for the nets. */
8706                         } else {
8707                                 asoc->ifp_had_enobuf = 0;
8708                         }
8709                         endoutchain = NULL;
8710                         auth = NULL;
8711                         auth_offset = 0;
8712                         if (bundle_at || hbflag) {
8713                                 /* For data/asconf and hb set time */
8714                                 if (*now_filled == 0) {
8715                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8716                                         *now_filled = 1;
8717                                         *now = net->last_sent_time;
8718                                 } else {
8719                                         net->last_sent_time = *now;
8720                                 }
8721                         }
8722                         if (!no_out_cnt) {
8723                                 *num_out += (ctl_cnt + bundle_at);
8724                         }
8725                         if (bundle_at) {
8726                                 /* setup for a RTO measurement */
8727                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8728                                 /* fill time if not already filled */
8729                                 if (*now_filled == 0) {
8730                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8731                                         *now_filled = 1;
8732                                         *now = asoc->time_last_sent;
8733                                 } else {
8734                                         asoc->time_last_sent = *now;
8735                                 }
8736                                 if (net->rto_needed) {
8737                                         data_list[0]->do_rtt = 1;
8738                                         net->rto_needed = 0;
8739                                 }
8740                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8741                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8742                         }
8743                         if (one_chunk) {
8744                                 break;
8745                         }
8746                 }
8747                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8748                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8749                 }
8750         }
8751         if (old_start_at == NULL) {
8752                 old_start_at = start_at;
8753                 start_at = TAILQ_FIRST(&asoc->nets);
8754                 if (old_start_at)
8755                         goto again_one_more_time;
8756         }
8757         /*
8758          * At the end there should be no NON timed chunks hanging on this
8759          * queue.
8760          */
8761         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8762                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8763         }
8764         if ((*num_out == 0) && (*reason_code == 0)) {
8765                 *reason_code = 4;
8766         } else {
8767                 *reason_code = 5;
8768         }
8769         sctp_clean_up_ctl(stcb, asoc, so_locked);
8770         return (0);
8771 }
8772
8773 void
8774 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8775 {
8776         /*-
8777          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8778          * the control chunk queue.
8779          */
8780         struct sctp_chunkhdr *hdr;
8781         struct sctp_tmit_chunk *chk;
8782         struct mbuf *mat;
8783
8784         SCTP_TCB_LOCK_ASSERT(stcb);
8785         sctp_alloc_a_chunk(stcb, chk);
8786         if (chk == NULL) {
8787                 /* no memory */
8788                 sctp_m_freem(op_err);
8789                 return;
8790         }
8791         chk->copy_by_ref = 0;
8792         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8793         if (op_err == NULL) {
8794                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8795                 return;
8796         }
8797         chk->send_size = 0;
8798         mat = op_err;
8799         while (mat != NULL) {
8800                 chk->send_size += SCTP_BUF_LEN(mat);
8801                 mat = SCTP_BUF_NEXT(mat);
8802         }
8803         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8804         chk->rec.chunk_id.can_take_data = 1;
8805         chk->sent = SCTP_DATAGRAM_UNSENT;
8806         chk->snd_count = 0;
8807         chk->flags = 0;
8808         chk->asoc = &stcb->asoc;
8809         chk->data = op_err;
8810         chk->whoTo = NULL;
8811         hdr = mtod(op_err, struct sctp_chunkhdr *);
8812         hdr->chunk_type = SCTP_OPERATION_ERROR;
8813         hdr->chunk_flags = 0;
8814         hdr->chunk_length = htons(chk->send_size);
8815         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8816             chk,
8817             sctp_next);
8818         chk->asoc->ctrl_queue_cnt++;
8819 }
8820
8821 int
8822 sctp_send_cookie_echo(struct mbuf *m,
8823     int offset,
8824     struct sctp_tcb *stcb,
8825     struct sctp_nets *net)
8826 {
8827         /*-
8828          * pull out the cookie and put it at the front of the control chunk
8829          * queue.
8830          */
8831         int at;
8832         struct mbuf *cookie;
8833         struct sctp_paramhdr parm, *phdr;
8834         struct sctp_chunkhdr *hdr;
8835         struct sctp_tmit_chunk *chk;
8836         uint16_t ptype, plen;
8837
8838         /* First find the cookie in the param area */
8839         cookie = NULL;
8840         at = offset + sizeof(struct sctp_init_chunk);
8841
8842         SCTP_TCB_LOCK_ASSERT(stcb);
8843         do {
8844                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8845                 if (phdr == NULL) {
8846                         return (-3);
8847                 }
8848                 ptype = ntohs(phdr->param_type);
8849                 plen = ntohs(phdr->param_length);
8850                 if (ptype == SCTP_STATE_COOKIE) {
8851                         int pad;
8852
8853                         /* found the cookie */
8854                         if ((pad = (plen % 4))) {
8855                                 plen += 4 - pad;
8856                         }
8857                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8858                         if (cookie == NULL) {
8859                                 /* No memory */
8860                                 return (-2);
8861                         }
8862 #ifdef SCTP_MBUF_LOGGING
8863                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8864                                 struct mbuf *mat;
8865
8866                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8867                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8868                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8869                                         }
8870                                 }
8871                         }
8872 #endif
8873                         break;
8874                 }
8875                 at += SCTP_SIZE32(plen);
8876         } while (phdr);
8877         if (cookie == NULL) {
8878                 /* Did not find the cookie */
8879                 return (-3);
8880         }
8881         /* ok, we got the cookie lets change it into a cookie echo chunk */
8882
8883         /* first the change from param to cookie */
8884         hdr = mtod(cookie, struct sctp_chunkhdr *);
8885         hdr->chunk_type = SCTP_COOKIE_ECHO;
8886         hdr->chunk_flags = 0;
8887         /* get the chunk stuff now and place it in the FRONT of the queue */
8888         sctp_alloc_a_chunk(stcb, chk);
8889         if (chk == NULL) {
8890                 /* no memory */
8891                 sctp_m_freem(cookie);
8892                 return (-5);
8893         }
8894         chk->copy_by_ref = 0;
8895         chk->send_size = plen;
8896         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8897         chk->rec.chunk_id.can_take_data = 0;
8898         chk->sent = SCTP_DATAGRAM_UNSENT;
8899         chk->snd_count = 0;
8900         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8901         chk->asoc = &stcb->asoc;
8902         chk->data = cookie;
8903         chk->whoTo = net;
8904         atomic_add_int(&chk->whoTo->ref_count, 1);
8905         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8906         chk->asoc->ctrl_queue_cnt++;
8907         return (0);
8908 }
8909
8910 void
8911 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8912     struct mbuf *m,
8913     int offset,
8914     int chk_length,
8915     struct sctp_nets *net)
8916 {
8917         /*
8918          * take a HB request and make it into a HB ack and send it.
8919          */
8920         struct mbuf *outchain;
8921         struct sctp_chunkhdr *chdr;
8922         struct sctp_tmit_chunk *chk;
8923
8924
8925         if (net == NULL)
8926                 /* must have a net pointer */
8927                 return;
8928
8929         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8930         if (outchain == NULL) {
8931                 /* gak out of memory */
8932                 return;
8933         }
8934 #ifdef SCTP_MBUF_LOGGING
8935         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8936                 struct mbuf *mat;
8937
8938                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
8939                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8940                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8941                         }
8942                 }
8943         }
8944 #endif
8945         chdr = mtod(outchain, struct sctp_chunkhdr *);
8946         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8947         chdr->chunk_flags = 0;
8948         if (chk_length % 4) {
8949                 /* need pad */
8950                 uint32_t cpthis = 0;
8951                 int padlen;
8952
8953                 padlen = 4 - (chk_length % 4);
8954                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8955         }
8956         sctp_alloc_a_chunk(stcb, chk);
8957         if (chk == NULL) {
8958                 /* no memory */
8959                 sctp_m_freem(outchain);
8960                 return;
8961         }
8962         chk->copy_by_ref = 0;
8963         chk->send_size = chk_length;
8964         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8965         chk->rec.chunk_id.can_take_data = 1;
8966         chk->sent = SCTP_DATAGRAM_UNSENT;
8967         chk->snd_count = 0;
8968         chk->flags = 0;
8969         chk->asoc = &stcb->asoc;
8970         chk->data = outchain;
8971         chk->whoTo = net;
8972         atomic_add_int(&chk->whoTo->ref_count, 1);
8973         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8974         chk->asoc->ctrl_queue_cnt++;
8975 }
8976
8977 void
8978 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8979 {
8980         /* formulate and queue a cookie-ack back to sender */
8981         struct mbuf *cookie_ack;
8982         struct sctp_chunkhdr *hdr;
8983         struct sctp_tmit_chunk *chk;
8984
8985         cookie_ack = NULL;
8986         SCTP_TCB_LOCK_ASSERT(stcb);
8987
8988         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8989         if (cookie_ack == NULL) {
8990                 /* no mbuf's */
8991                 return;
8992         }
8993         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8994         sctp_alloc_a_chunk(stcb, chk);
8995         if (chk == NULL) {
8996                 /* no memory */
8997                 sctp_m_freem(cookie_ack);
8998                 return;
8999         }
9000         chk->copy_by_ref = 0;
9001         chk->send_size = sizeof(struct sctp_chunkhdr);
9002         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9003         chk->rec.chunk_id.can_take_data = 1;
9004         chk->sent = SCTP_DATAGRAM_UNSENT;
9005         chk->snd_count = 0;
9006         chk->flags = 0;
9007         chk->asoc = &stcb->asoc;
9008         chk->data = cookie_ack;
9009         if (chk->asoc->last_control_chunk_from != NULL) {
9010                 chk->whoTo = chk->asoc->last_control_chunk_from;
9011                 atomic_add_int(&chk->whoTo->ref_count, 1);
9012         } else {
9013                 chk->whoTo = NULL;
9014         }
9015         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9016         hdr->chunk_type = SCTP_COOKIE_ACK;
9017         hdr->chunk_flags = 0;
9018         hdr->chunk_length = htons(chk->send_size);
9019         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9020         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9021         chk->asoc->ctrl_queue_cnt++;
9022         return;
9023 }
9024
9025
9026 void
9027 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9028 {
9029         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9030         struct mbuf *m_shutdown_ack;
9031         struct sctp_shutdown_ack_chunk *ack_cp;
9032         struct sctp_tmit_chunk *chk;
9033
9034         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9035         if (m_shutdown_ack == NULL) {
9036                 /* no mbuf's */
9037                 return;
9038         }
9039         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9040         sctp_alloc_a_chunk(stcb, chk);
9041         if (chk == NULL) {
9042                 /* no memory */
9043                 sctp_m_freem(m_shutdown_ack);
9044                 return;
9045         }
9046         chk->copy_by_ref = 0;
9047         chk->send_size = sizeof(struct sctp_chunkhdr);
9048         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9049         chk->rec.chunk_id.can_take_data = 1;
9050         chk->sent = SCTP_DATAGRAM_UNSENT;
9051         chk->snd_count = 0;
9052         chk->flags = 0;
9053         chk->asoc = &stcb->asoc;
9054         chk->data = m_shutdown_ack;
9055         chk->whoTo = net;
9056         if (chk->whoTo) {
9057                 atomic_add_int(&chk->whoTo->ref_count, 1);
9058         }
9059         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9060         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9061         ack_cp->ch.chunk_flags = 0;
9062         ack_cp->ch.chunk_length = htons(chk->send_size);
9063         SCTP_BUF_LEN(m_shutdown_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 void
9070 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9071 {
9072         /* formulate and queue a SHUTDOWN to the sender */
9073         struct mbuf *m_shutdown;
9074         struct sctp_shutdown_chunk *shutdown_cp;
9075         struct sctp_tmit_chunk *chk;
9076
9077         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9078         if (m_shutdown == NULL) {
9079                 /* no mbuf's */
9080                 return;
9081         }
9082         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9083         sctp_alloc_a_chunk(stcb, chk);
9084         if (chk == NULL) {
9085                 /* no memory */
9086                 sctp_m_freem(m_shutdown);
9087                 return;
9088         }
9089         chk->copy_by_ref = 0;
9090         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9091         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9092         chk->rec.chunk_id.can_take_data = 1;
9093         chk->sent = SCTP_DATAGRAM_UNSENT;
9094         chk->snd_count = 0;
9095         chk->flags = 0;
9096         chk->asoc = &stcb->asoc;
9097         chk->data = m_shutdown;
9098         chk->whoTo = net;
9099         if (chk->whoTo) {
9100                 atomic_add_int(&chk->whoTo->ref_count, 1);
9101         }
9102         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9103         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9104         shutdown_cp->ch.chunk_flags = 0;
9105         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9106         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9107         SCTP_BUF_LEN(m_shutdown) = 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_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9115 {
9116         /*
9117          * formulate and queue an ASCONF to the peer. ASCONF parameters
9118          * should be queued on the assoc queue.
9119          */
9120         struct sctp_tmit_chunk *chk;
9121         struct mbuf *m_asconf;
9122         int len;
9123
9124         SCTP_TCB_LOCK_ASSERT(stcb);
9125
9126         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9127             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9128                 /* can't send a new one if there is one in flight already */
9129                 return;
9130         }
9131         /* compose an ASCONF chunk, maximum length is PMTU */
9132         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9133         if (m_asconf == NULL) {
9134                 return;
9135         }
9136         sctp_alloc_a_chunk(stcb, chk);
9137         if (chk == NULL) {
9138                 /* no memory */
9139                 sctp_m_freem(m_asconf);
9140                 return;
9141         }
9142         chk->copy_by_ref = 0;
9143         chk->data = m_asconf;
9144         chk->send_size = len;
9145         chk->rec.chunk_id.id = SCTP_ASCONF;
9146         chk->rec.chunk_id.can_take_data = 0;
9147         chk->sent = SCTP_DATAGRAM_UNSENT;
9148         chk->snd_count = 0;
9149         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9150         chk->asoc = &stcb->asoc;
9151         chk->whoTo = net;
9152         if (chk->whoTo) {
9153                 atomic_add_int(&chk->whoTo->ref_count, 1);
9154         }
9155         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9156         chk->asoc->ctrl_queue_cnt++;
9157         return;
9158 }
9159
9160 void
9161 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9162 {
9163         /*
9164          * formulate and queue a asconf-ack back to sender. the asconf-ack
9165          * must be stored in the tcb.
9166          */
9167         struct sctp_tmit_chunk *chk;
9168         struct sctp_asconf_ack *ack, *latest_ack;
9169         struct mbuf *m_ack;
9170         struct sctp_nets *net = NULL;
9171
9172         SCTP_TCB_LOCK_ASSERT(stcb);
9173         /* Get the latest ASCONF-ACK */
9174         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9175         if (latest_ack == NULL) {
9176                 return;
9177         }
9178         if (latest_ack->last_sent_to != NULL &&
9179             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9180                 /* we're doing a retransmission */
9181                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9182                 if (net == NULL) {
9183                         /* no alternate */
9184                         if (stcb->asoc.last_control_chunk_from == NULL) {
9185                                 if (stcb->asoc.alternate) {
9186                                         net = stcb->asoc.alternate;
9187                                 } else {
9188                                         net = stcb->asoc.primary_destination;
9189                                 }
9190                         } else {
9191                                 net = stcb->asoc.last_control_chunk_from;
9192                         }
9193                 }
9194         } else {
9195                 /* normal case */
9196                 if (stcb->asoc.last_control_chunk_from == NULL) {
9197                         if (stcb->asoc.alternate) {
9198                                 net = stcb->asoc.alternate;
9199                         } else {
9200                                 net = stcb->asoc.primary_destination;
9201                         }
9202                 } else {
9203                         net = stcb->asoc.last_control_chunk_from;
9204                 }
9205         }
9206         latest_ack->last_sent_to = net;
9207
9208         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9209                 if (ack->data == NULL) {
9210                         continue;
9211                 }
9212                 /* copy the asconf_ack */
9213                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9214                 if (m_ack == NULL) {
9215                         /* couldn't copy it */
9216                         return;
9217                 }
9218 #ifdef SCTP_MBUF_LOGGING
9219                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9220                         struct mbuf *mat;
9221
9222                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9223                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9224                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9225                                 }
9226                         }
9227                 }
9228 #endif
9229
9230                 sctp_alloc_a_chunk(stcb, chk);
9231                 if (chk == NULL) {
9232                         /* no memory */
9233                         if (m_ack)
9234                                 sctp_m_freem(m_ack);
9235                         return;
9236                 }
9237                 chk->copy_by_ref = 0;
9238
9239                 chk->whoTo = net;
9240                 if (chk->whoTo) {
9241                         atomic_add_int(&chk->whoTo->ref_count, 1);
9242                 }
9243                 chk->data = m_ack;
9244                 chk->send_size = 0;
9245                 /* Get size */
9246                 chk->send_size = ack->len;
9247                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9248                 chk->rec.chunk_id.can_take_data = 1;
9249                 chk->sent = SCTP_DATAGRAM_UNSENT;
9250                 chk->snd_count = 0;
9251                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9252                 chk->asoc = &stcb->asoc;
9253
9254                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9255                 chk->asoc->ctrl_queue_cnt++;
9256         }
9257         return;
9258 }
9259
9260
9261 static int
9262 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9263     struct sctp_tcb *stcb,
9264     struct sctp_association *asoc,
9265     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9266 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9267     SCTP_UNUSED
9268 #endif
9269 )
9270 {
9271         /*-
9272          * send out one MTU of retransmission. If fast_retransmit is
9273          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9274          * rwnd. For a Cookie or Asconf in the control chunk queue we
9275          * retransmit them by themselves.
9276          *
9277          * For data chunks we will pick out the lowest TSN's in the sent_queue
9278          * marked for resend and bundle them all together (up to a MTU of
9279          * destination). The address to send to should have been
9280          * selected/changed where the retransmission was marked (i.e. in FR
9281          * or t3-timeout routines).
9282          */
9283         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9284         struct sctp_tmit_chunk *chk, *fwd;
9285         struct mbuf *m, *endofchain;
9286         struct sctp_nets *net = NULL;
9287         uint32_t tsns_sent = 0;
9288         int no_fragmentflg, bundle_at, cnt_thru;
9289         unsigned int mtu;
9290         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9291         struct sctp_auth_chunk *auth = NULL;
9292         uint32_t auth_offset = 0;
9293         uint16_t auth_keyid;
9294         int override_ok = 1;
9295         int data_auth_reqd = 0;
9296         uint32_t dmtu = 0;
9297
9298         SCTP_TCB_LOCK_ASSERT(stcb);
9299         tmr_started = ctl_cnt = bundle_at = error = 0;
9300         no_fragmentflg = 1;
9301         fwd_tsn = 0;
9302         *cnt_out = 0;
9303         fwd = NULL;
9304         endofchain = m = NULL;
9305         auth_keyid = stcb->asoc.authinfo.active_keyid;
9306 #ifdef SCTP_AUDITING_ENABLED
9307         sctp_audit_log(0xC3, 1);
9308 #endif
9309         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9310             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9311                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9312                     asoc->sent_queue_retran_cnt);
9313                 asoc->sent_queue_cnt = 0;
9314                 asoc->sent_queue_cnt_removeable = 0;
9315                 /* send back 0/0 so we enter normal transmission */
9316                 *cnt_out = 0;
9317                 return (0);
9318         }
9319         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9320                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9321                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9322                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9323                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9324                                 continue;
9325                         }
9326                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9327                                 if (chk != asoc->str_reset) {
9328                                         /*
9329                                          * not eligible for retran if its
9330                                          * not ours
9331                                          */
9332                                         continue;
9333                                 }
9334                         }
9335                         ctl_cnt++;
9336                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9337                                 fwd_tsn = 1;
9338                         }
9339                         /*
9340                          * Add an AUTH chunk, if chunk requires it save the
9341                          * offset into the chain for AUTH
9342                          */
9343                         if ((auth == NULL) &&
9344                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9345                             stcb->asoc.peer_auth_chunks))) {
9346                                 m = sctp_add_auth_chunk(m, &endofchain,
9347                                     &auth, &auth_offset,
9348                                     stcb,
9349                                     chk->rec.chunk_id.id);
9350                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9351                         }
9352                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9353                         break;
9354                 }
9355         }
9356         one_chunk = 0;
9357         cnt_thru = 0;
9358         /* do we have control chunks to retransmit? */
9359         if (m != NULL) {
9360                 /* Start a timer no matter if we suceed or fail */
9361                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9362                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9363                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9364                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9365                 chk->snd_count++;       /* update our count */
9366                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9367                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9368                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9369                     no_fragmentflg, 0, 0,
9370                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9371                     chk->whoTo->port, NULL,
9372                     0, 0,
9373                     so_locked))) {
9374                         SCTP_STAT_INCR(sctps_lowlevelerr);
9375                         return (error);
9376                 }
9377                 endofchain = NULL;
9378                 auth = NULL;
9379                 auth_offset = 0;
9380                 /*
9381                  * We don't want to mark the net->sent time here since this
9382                  * we use this for HB and retrans cannot measure RTT
9383                  */
9384                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9385                 *cnt_out += 1;
9386                 chk->sent = SCTP_DATAGRAM_SENT;
9387                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9388                 if (fwd_tsn == 0) {
9389                         return (0);
9390                 } else {
9391                         /* Clean up the fwd-tsn list */
9392                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9393                         return (0);
9394                 }
9395         }
9396         /*
9397          * Ok, it is just data retransmission we need to do or that and a
9398          * fwd-tsn with it all.
9399          */
9400         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9401                 return (SCTP_RETRAN_DONE);
9402         }
9403         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9404             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9405                 /* not yet open, resend the cookie and that is it */
9406                 return (1);
9407         }
9408 #ifdef SCTP_AUDITING_ENABLED
9409         sctp_auditing(20, inp, stcb, NULL);
9410 #endif
9411         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9412         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9413                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9414                         /* No, not sent to this net or not ready for rtx */
9415                         continue;
9416                 }
9417                 if (chk->data == NULL) {
9418                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9419                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9420                         continue;
9421                 }
9422                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9423                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9424                         /* Gak, we have exceeded max unlucky retran, abort! */
9425                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9426                             chk->snd_count,
9427                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9428                         atomic_add_int(&stcb->asoc.refcnt, 1);
9429                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9430                         SCTP_TCB_LOCK(stcb);
9431                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9432                         return (SCTP_RETRAN_EXIT);
9433                 }
9434                 /* pick up the net */
9435                 net = chk->whoTo;
9436                 switch (net->ro._l_addr.sa.sa_family) {
9437 #ifdef INET
9438                 case AF_INET:
9439                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9440                         break;
9441 #endif
9442 #ifdef INET6
9443                 case AF_INET6:
9444                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9445                         break;
9446 #endif
9447                 default:
9448                         /* TSNH */
9449                         mtu = net->mtu;
9450                         break;
9451                 }
9452
9453                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9454                         /* No room in peers rwnd */
9455                         uint32_t tsn;
9456
9457                         tsn = asoc->last_acked_seq + 1;
9458                         if (tsn == chk->rec.data.TSN_seq) {
9459                                 /*
9460                                  * we make a special exception for this
9461                                  * case. The peer has no rwnd but is missing
9462                                  * the lowest chunk.. which is probably what
9463                                  * is holding up the rwnd.
9464                                  */
9465                                 goto one_chunk_around;
9466                         }
9467                         return (1);
9468                 }
9469 one_chunk_around:
9470                 if (asoc->peers_rwnd < mtu) {
9471                         one_chunk = 1;
9472                         if ((asoc->peers_rwnd == 0) &&
9473                             (asoc->total_flight == 0)) {
9474                                 chk->window_probe = 1;
9475                                 chk->whoTo->window_probe = 1;
9476                         }
9477                 }
9478 #ifdef SCTP_AUDITING_ENABLED
9479                 sctp_audit_log(0xC3, 2);
9480 #endif
9481                 bundle_at = 0;
9482                 m = NULL;
9483                 net->fast_retran_ip = 0;
9484                 if (chk->rec.data.doing_fast_retransmit == 0) {
9485                         /*
9486                          * if no FR in progress skip destination that have
9487                          * flight_size > cwnd.
9488                          */
9489                         if (net->flight_size >= net->cwnd) {
9490                                 continue;
9491                         }
9492                 } else {
9493                         /*
9494                          * Mark the destination net to have FR recovery
9495                          * limits put on it.
9496                          */
9497                         *fr_done = 1;
9498                         net->fast_retran_ip = 1;
9499                 }
9500
9501                 /*
9502                  * if no AUTH is yet included and this chunk requires it,
9503                  * make sure to account for it.  We don't apply the size
9504                  * until the AUTH chunk is actually added below in case
9505                  * there is no room for this chunk.
9506                  */
9507                 if (data_auth_reqd && (auth == NULL)) {
9508                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9509                 } else
9510                         dmtu = 0;
9511
9512                 if ((chk->send_size <= (mtu - dmtu)) ||
9513                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9514                         /* ok we will add this one */
9515                         if (data_auth_reqd) {
9516                                 if (auth == NULL) {
9517                                         m = sctp_add_auth_chunk(m,
9518                                             &endofchain,
9519                                             &auth,
9520                                             &auth_offset,
9521                                             stcb,
9522                                             SCTP_DATA);
9523                                         auth_keyid = chk->auth_keyid;
9524                                         override_ok = 0;
9525                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9526                                 } else if (override_ok) {
9527                                         auth_keyid = chk->auth_keyid;
9528                                         override_ok = 0;
9529                                 } else if (chk->auth_keyid != auth_keyid) {
9530                                         /* different keyid, so done bundling */
9531                                         break;
9532                                 }
9533                         }
9534                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9535                         if (m == NULL) {
9536                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9537                                 return (ENOMEM);
9538                         }
9539                         /* Do clear IP_DF ? */
9540                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9541                                 no_fragmentflg = 0;
9542                         }
9543                         /* upate our MTU size */
9544                         if (mtu > (chk->send_size + dmtu))
9545                                 mtu -= (chk->send_size + dmtu);
9546                         else
9547                                 mtu = 0;
9548                         data_list[bundle_at++] = chk;
9549                         if (one_chunk && (asoc->total_flight <= 0)) {
9550                                 SCTP_STAT_INCR(sctps_windowprobed);
9551                         }
9552                 }
9553                 if (one_chunk == 0) {
9554                         /*
9555                          * now are there anymore forward from chk to pick
9556                          * up?
9557                          */
9558                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9559                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9560                                         /* Nope, not for retran */
9561                                         continue;
9562                                 }
9563                                 if (fwd->whoTo != net) {
9564                                         /* Nope, not the net in question */
9565                                         continue;
9566                                 }
9567                                 if (data_auth_reqd && (auth == NULL)) {
9568                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9569                                 } else
9570                                         dmtu = 0;
9571                                 if (fwd->send_size <= (mtu - dmtu)) {
9572                                         if (data_auth_reqd) {
9573                                                 if (auth == NULL) {
9574                                                         m = sctp_add_auth_chunk(m,
9575                                                             &endofchain,
9576                                                             &auth,
9577                                                             &auth_offset,
9578                                                             stcb,
9579                                                             SCTP_DATA);
9580                                                         auth_keyid = fwd->auth_keyid;
9581                                                         override_ok = 0;
9582                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9583                                                 } else if (override_ok) {
9584                                                         auth_keyid = fwd->auth_keyid;
9585                                                         override_ok = 0;
9586                                                 } else if (fwd->auth_keyid != auth_keyid) {
9587                                                         /*
9588                                                          * different keyid,
9589                                                          * so done bundling
9590                                                          */
9591                                                         break;
9592                                                 }
9593                                         }
9594                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9595                                         if (m == NULL) {
9596                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9597                                                 return (ENOMEM);
9598                                         }
9599                                         /* Do clear IP_DF ? */
9600                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9601                                                 no_fragmentflg = 0;
9602                                         }
9603                                         /* upate our MTU size */
9604                                         if (mtu > (fwd->send_size + dmtu))
9605                                                 mtu -= (fwd->send_size + dmtu);
9606                                         else
9607                                                 mtu = 0;
9608                                         data_list[bundle_at++] = fwd;
9609                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9610                                                 break;
9611                                         }
9612                                 } else {
9613                                         /* can't fit so we are done */
9614                                         break;
9615                                 }
9616                         }
9617                 }
9618                 /* Is there something to send for this destination? */
9619                 if (m) {
9620                         /*
9621                          * No matter if we fail/or suceed we should start a
9622                          * timer. A failure is like a lost IP packet :-)
9623                          */
9624                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9625                                 /*
9626                                  * no timer running on this destination
9627                                  * restart it.
9628                                  */
9629                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9630                                 tmr_started = 1;
9631                         }
9632                         /* Now lets send it, if there is anything to send :> */
9633                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9634                             (struct sockaddr *)&net->ro._l_addr, m,
9635                             auth_offset, auth, auth_keyid,
9636                             no_fragmentflg, 0, 0,
9637                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9638                             net->port, NULL,
9639                             0, 0,
9640                             so_locked))) {
9641                                 /* error, we could not output */
9642                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9643                                 return (error);
9644                         }
9645                         endofchain = NULL;
9646                         auth = NULL;
9647                         auth_offset = 0;
9648                         /* For HB's */
9649                         /*
9650                          * We don't want to mark the net->sent time here
9651                          * since this we use this for HB and retrans cannot
9652                          * measure RTT
9653                          */
9654                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9655
9656                         /* For auto-close */
9657                         cnt_thru++;
9658                         if (*now_filled == 0) {
9659                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9660                                 *now = asoc->time_last_sent;
9661                                 *now_filled = 1;
9662                         } else {
9663                                 asoc->time_last_sent = *now;
9664                         }
9665                         *cnt_out += bundle_at;
9666 #ifdef SCTP_AUDITING_ENABLED
9667                         sctp_audit_log(0xC4, bundle_at);
9668 #endif
9669                         if (bundle_at) {
9670                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9671                         }
9672                         for (i = 0; i < bundle_at; i++) {
9673                                 SCTP_STAT_INCR(sctps_sendretransdata);
9674                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9675                                 /*
9676                                  * When we have a revoked data, and we
9677                                  * retransmit it, then we clear the revoked
9678                                  * flag since this flag dictates if we
9679                                  * subtracted from the fs
9680                                  */
9681                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9682                                         /* Deflate the cwnd */
9683                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9684                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9685                                 }
9686                                 data_list[i]->snd_count++;
9687                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9688                                 /* record the time */
9689                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9690                                 if (data_list[i]->book_size_scale) {
9691                                         /*
9692                                          * need to double the book size on
9693                                          * this one
9694                                          */
9695                                         data_list[i]->book_size_scale = 0;
9696                                         /*
9697                                          * Since we double the booksize, we
9698                                          * must also double the output queue
9699                                          * size, since this get shrunk when
9700                                          * we free by this amount.
9701                                          */
9702                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9703                                         data_list[i]->book_size *= 2;
9704
9705
9706                                 } else {
9707                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9708                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9709                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9710                                         }
9711                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9712                                             (uint32_t) (data_list[i]->send_size +
9713                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9714                                 }
9715                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9716                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9717                                             data_list[i]->whoTo->flight_size,
9718                                             data_list[i]->book_size,
9719                                             (uintptr_t) data_list[i]->whoTo,
9720                                             data_list[i]->rec.data.TSN_seq);
9721                                 }
9722                                 sctp_flight_size_increase(data_list[i]);
9723                                 sctp_total_flight_increase(stcb, data_list[i]);
9724                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9725                                         /* SWS sender side engages */
9726                                         asoc->peers_rwnd = 0;
9727                                 }
9728                                 if ((i == 0) &&
9729                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9730                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9731                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9732                                             (tmr_started == 0)) {
9733                                                 /*-
9734                                                  * ok we just fast-retrans'd
9735                                                  * the lowest TSN, i.e the
9736                                                  * first on the list. In
9737                                                  * this case we want to give
9738                                                  * some more time to get a
9739                                                  * SACK back without a
9740                                                  * t3-expiring.
9741                                                  */
9742                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9743                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9744                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9745                                         }
9746                                 }
9747                         }
9748                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9749                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9750                         }
9751 #ifdef SCTP_AUDITING_ENABLED
9752                         sctp_auditing(21, inp, stcb, NULL);
9753 #endif
9754                 } else {
9755                         /* None will fit */
9756                         return (1);
9757                 }
9758                 if (asoc->sent_queue_retran_cnt <= 0) {
9759                         /* all done we have no more to retran */
9760                         asoc->sent_queue_retran_cnt = 0;
9761                         break;
9762                 }
9763                 if (one_chunk) {
9764                         /* No more room in rwnd */
9765                         return (1);
9766                 }
9767                 /* stop the for loop here. we sent out a packet */
9768                 break;
9769         }
9770         return (0);
9771 }
9772
9773 static void
9774 sctp_timer_validation(struct sctp_inpcb *inp,
9775     struct sctp_tcb *stcb,
9776     struct sctp_association *asoc)
9777 {
9778         struct sctp_nets *net;
9779
9780         /* Validate that a timer is running somewhere */
9781         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9782                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9783                         /* Here is a timer */
9784                         return;
9785                 }
9786         }
9787         SCTP_TCB_LOCK_ASSERT(stcb);
9788         /* Gak, we did not have a timer somewhere */
9789         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9790         if (asoc->alternate) {
9791                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9792         } else {
9793                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9794         }
9795         return;
9796 }
9797
9798 void
9799 sctp_chunk_output(struct sctp_inpcb *inp,
9800     struct sctp_tcb *stcb,
9801     int from_where,
9802     int so_locked
9803 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9804     SCTP_UNUSED
9805 #endif
9806 )
9807 {
9808         /*-
9809          * Ok this is the generic chunk service queue. we must do the
9810          * following:
9811          * - See if there are retransmits pending, if so we must
9812          *   do these first.
9813          * - Service the stream queue that is next, moving any
9814          *   message (note I must get a complete message i.e.
9815          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9816          *   TSN's
9817          * - Check to see if the cwnd/rwnd allows any output, if so we
9818          *   go ahead and fomulate and send the low level chunks. Making sure
9819          *   to combine any control in the control chunk queue also.
9820          */
9821         struct sctp_association *asoc;
9822         struct sctp_nets *net;
9823         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9824         unsigned int burst_cnt = 0;
9825         struct timeval now;
9826         int now_filled = 0;
9827         int nagle_on;
9828         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9829         int un_sent = 0;
9830         int fr_done;
9831         unsigned int tot_frs = 0;
9832
9833         asoc = &stcb->asoc;
9834         /* The Nagle algorithm is only applied when handling a send call. */
9835         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9836                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9837                         nagle_on = 0;
9838                 } else {
9839                         nagle_on = 1;
9840                 }
9841         } else {
9842                 nagle_on = 0;
9843         }
9844         SCTP_TCB_LOCK_ASSERT(stcb);
9845
9846         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9847
9848         if ((un_sent <= 0) &&
9849             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9850             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9851             (asoc->sent_queue_retran_cnt == 0)) {
9852                 /* Nothing to do unless there is something to be sent left */
9853                 return;
9854         }
9855         /*
9856          * Do we have something to send, data or control AND a sack timer
9857          * running, if so piggy-back the sack.
9858          */
9859         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9860                 sctp_send_sack(stcb, so_locked);
9861                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9862         }
9863         while (asoc->sent_queue_retran_cnt) {
9864                 /*-
9865                  * Ok, it is retransmission time only, we send out only ONE
9866                  * packet with a single call off to the retran code.
9867                  */
9868                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9869                         /*-
9870                          * Special hook for handling cookiess discarded
9871                          * by peer that carried data. Send cookie-ack only
9872                          * and then the next call with get the retran's.
9873                          */
9874                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9875                             from_where,
9876                             &now, &now_filled, frag_point, so_locked);
9877                         return;
9878                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9879                         /* if its not from a HB then do it */
9880                         fr_done = 0;
9881                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9882                         if (fr_done) {
9883                                 tot_frs++;
9884                         }
9885                 } else {
9886                         /*
9887                          * its from any other place, we don't allow retran
9888                          * output (only control)
9889                          */
9890                         ret = 1;
9891                 }
9892                 if (ret > 0) {
9893                         /* Can't send anymore */
9894                         /*-
9895                          * now lets push out control by calling med-level
9896                          * output once. this assures that we WILL send HB's
9897                          * if queued too.
9898                          */
9899                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9900                             from_where,
9901                             &now, &now_filled, frag_point, so_locked);
9902 #ifdef SCTP_AUDITING_ENABLED
9903                         sctp_auditing(8, inp, stcb, NULL);
9904 #endif
9905                         sctp_timer_validation(inp, stcb, asoc);
9906                         return;
9907                 }
9908                 if (ret < 0) {
9909                         /*-
9910                          * The count was off.. retran is not happening so do
9911                          * the normal retransmission.
9912                          */
9913 #ifdef SCTP_AUDITING_ENABLED
9914                         sctp_auditing(9, inp, stcb, NULL);
9915 #endif
9916                         if (ret == SCTP_RETRAN_EXIT) {
9917                                 return;
9918                         }
9919                         break;
9920                 }
9921                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9922                         /* Only one transmission allowed out of a timeout */
9923 #ifdef SCTP_AUDITING_ENABLED
9924                         sctp_auditing(10, inp, stcb, NULL);
9925 #endif
9926                         /* Push out any control */
9927                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9928                             &now, &now_filled, frag_point, so_locked);
9929                         return;
9930                 }
9931                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9932                         /* Hit FR burst limit */
9933                         return;
9934                 }
9935                 if ((num_out == 0) && (ret == 0)) {
9936                         /* No more retrans to send */
9937                         break;
9938                 }
9939         }
9940 #ifdef SCTP_AUDITING_ENABLED
9941         sctp_auditing(12, inp, stcb, NULL);
9942 #endif
9943         /* Check for bad destinations, if they exist move chunks around. */
9944         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9945                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9946                         /*-
9947                          * if possible move things off of this address we
9948                          * still may send below due to the dormant state but
9949                          * we try to find an alternate address to send to
9950                          * and if we have one we move all queued data on the
9951                          * out wheel to this alternate address.
9952                          */
9953                         if (net->ref_count > 1)
9954                                 sctp_move_chunks_from_net(stcb, net);
9955                 } else {
9956                         /*-
9957                          * if ((asoc->sat_network) || (net->addr_is_local))
9958                          * { burst_limit = asoc->max_burst *
9959                          * SCTP_SAT_NETWORK_BURST_INCR; }
9960                          */
9961                         if (asoc->max_burst > 0) {
9962                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9963                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9964                                                 /*
9965                                                  * JRS - Use the congestion
9966                                                  * control given in the
9967                                                  * congestion control module
9968                                                  */
9969                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9970                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9971                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9972                                                 }
9973                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9974                                         }
9975                                         net->fast_retran_ip = 0;
9976                                 } else {
9977                                         if (net->flight_size == 0) {
9978                                                 /*
9979                                                  * Should be decaying the
9980                                                  * cwnd here
9981                                                  */
9982                                                 ;
9983                                         }
9984                                 }
9985                         }
9986                 }
9987
9988         }
9989         burst_cnt = 0;
9990         do {
9991                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9992                     &reason_code, 0, from_where,
9993                     &now, &now_filled, frag_point, so_locked);
9994                 if (error) {
9995                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
9996                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9997                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
9998                         }
9999                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10000                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10001                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10002                         }
10003                         break;
10004                 }
10005                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10006
10007                 tot_out += num_out;
10008                 burst_cnt++;
10009                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10010                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10011                         if (num_out == 0) {
10012                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10013                         }
10014                 }
10015                 if (nagle_on) {
10016                         /*
10017                          * When the Nagle algorithm is used, look at how
10018                          * much is unsent, then if its smaller than an MTU
10019                          * and we have data in flight we stop, except if we
10020                          * are handling a fragmented user message.
10021                          */
10022                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10023                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10024                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10025                             (stcb->asoc.total_flight > 0) &&
10026                             ((stcb->asoc.locked_on_sending == NULL) ||
10027                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10028                                 break;
10029                         }
10030                 }
10031                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10032                     TAILQ_EMPTY(&asoc->send_queue) &&
10033                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10034                         /* Nothing left to send */
10035                         break;
10036                 }
10037                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10038                         /* Nothing left to send */
10039                         break;
10040                 }
10041         } while (num_out &&
10042             ((asoc->max_burst == 0) ||
10043             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10044             (burst_cnt < asoc->max_burst)));
10045
10046         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10047                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10048                         SCTP_STAT_INCR(sctps_maxburstqueued);
10049                         asoc->burst_limit_applied = 1;
10050                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10051                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10052                         }
10053                 } else {
10054                         asoc->burst_limit_applied = 0;
10055                 }
10056         }
10057         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10058                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10059         }
10060         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10061             tot_out);
10062
10063         /*-
10064          * Now we need to clean up the control chunk chain if a ECNE is on
10065          * it. It must be marked as UNSENT again so next call will continue
10066          * to send it until such time that we get a CWR, to remove it.
10067          */
10068         if (stcb->asoc.ecn_echo_cnt_onq)
10069                 sctp_fix_ecn_echo(asoc);
10070         return;
10071 }
10072
10073
10074 int
10075 sctp_output(
10076     struct sctp_inpcb *inp,
10077     struct mbuf *m,
10078     struct sockaddr *addr,
10079     struct mbuf *control,
10080     struct thread *p,
10081     int flags)
10082 {
10083         if (inp == NULL) {
10084                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10085                 return (EINVAL);
10086         }
10087         if (inp->sctp_socket == NULL) {
10088                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10089                 return (EINVAL);
10090         }
10091         return (sctp_sosend(inp->sctp_socket,
10092             addr,
10093             (struct uio *)NULL,
10094             m,
10095             control,
10096             flags, p
10097             ));
10098 }
10099
10100 void
10101 send_forward_tsn(struct sctp_tcb *stcb,
10102     struct sctp_association *asoc)
10103 {
10104         struct sctp_tmit_chunk *chk;
10105         struct sctp_forward_tsn_chunk *fwdtsn;
10106         uint32_t advance_peer_ack_point;
10107
10108         SCTP_TCB_LOCK_ASSERT(stcb);
10109         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10110                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10111                         /* mark it to unsent */
10112                         chk->sent = SCTP_DATAGRAM_UNSENT;
10113                         chk->snd_count = 0;
10114                         /* Do we correct its output location? */
10115                         if (chk->whoTo) {
10116                                 sctp_free_remote_addr(chk->whoTo);
10117                                 chk->whoTo = NULL;
10118                         }
10119                         goto sctp_fill_in_rest;
10120                 }
10121         }
10122         /* Ok if we reach here we must build one */
10123         sctp_alloc_a_chunk(stcb, chk);
10124         if (chk == NULL) {
10125                 return;
10126         }
10127         asoc->fwd_tsn_cnt++;
10128         chk->copy_by_ref = 0;
10129         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10130         chk->rec.chunk_id.can_take_data = 0;
10131         chk->asoc = asoc;
10132         chk->whoTo = NULL;
10133         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10134         if (chk->data == NULL) {
10135                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10136                 return;
10137         }
10138         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10139         chk->sent = SCTP_DATAGRAM_UNSENT;
10140         chk->snd_count = 0;
10141         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10142         asoc->ctrl_queue_cnt++;
10143 sctp_fill_in_rest:
10144         /*-
10145          * Here we go through and fill out the part that deals with
10146          * stream/seq of the ones we skip.
10147          */
10148         SCTP_BUF_LEN(chk->data) = 0;
10149         {
10150                 struct sctp_tmit_chunk *at, *tp1, *last;
10151                 struct sctp_strseq *strseq;
10152                 unsigned int cnt_of_space, i, ovh;
10153                 unsigned int space_needed;
10154                 unsigned int cnt_of_skipped = 0;
10155
10156                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10157                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10158                                 /* no more to look at */
10159                                 break;
10160                         }
10161                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10162                                 /* We don't report these */
10163                                 continue;
10164                         }
10165                         cnt_of_skipped++;
10166                 }
10167                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10168                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10169
10170                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10171
10172                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10173                         ovh = SCTP_MIN_OVERHEAD;
10174                 } else {
10175                         ovh = SCTP_MIN_V4_OVERHEAD;
10176                 }
10177                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10178                         /* trim to a mtu size */
10179                         cnt_of_space = asoc->smallest_mtu - ovh;
10180                 }
10181                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10182                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10183                             0xff, 0, cnt_of_skipped,
10184                             asoc->advanced_peer_ack_point);
10185
10186                 }
10187                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10188                 if (cnt_of_space < space_needed) {
10189                         /*-
10190                          * ok we must trim down the chunk by lowering the
10191                          * advance peer ack point.
10192                          */
10193                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10194                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10195                                     0xff, 0xff, cnt_of_space,
10196                                     space_needed);
10197                         }
10198                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10199                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10200                         /*-
10201                          * Go through and find the TSN that will be the one
10202                          * we report.
10203                          */
10204                         at = TAILQ_FIRST(&asoc->sent_queue);
10205                         if (at != NULL) {
10206                                 for (i = 0; i < cnt_of_skipped; i++) {
10207                                         tp1 = TAILQ_NEXT(at, sctp_next);
10208                                         if (tp1 == NULL) {
10209                                                 break;
10210                                         }
10211                                         at = tp1;
10212                                 }
10213                         }
10214                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10215                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10216                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10217                                     asoc->advanced_peer_ack_point);
10218                         }
10219                         last = at;
10220                         /*-
10221                          * last now points to last one I can report, update
10222                          * peer ack point
10223                          */
10224                         if (last)
10225                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10226                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10227                             cnt_of_skipped * sizeof(struct sctp_strseq);
10228                 }
10229                 chk->send_size = space_needed;
10230                 /* Setup the chunk */
10231                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10232                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10233                 fwdtsn->ch.chunk_flags = 0;
10234                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10235                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10236                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10237                 fwdtsn++;
10238                 /*-
10239                  * Move pointer to after the fwdtsn and transfer to the
10240                  * strseq pointer.
10241                  */
10242                 strseq = (struct sctp_strseq *)fwdtsn;
10243                 /*-
10244                  * Now populate the strseq list. This is done blindly
10245                  * without pulling out duplicate stream info. This is
10246                  * inefficent but won't harm the process since the peer will
10247                  * look at these in sequence and will thus release anything.
10248                  * It could mean we exceed the PMTU and chop off some that
10249                  * we could have included.. but this is unlikely (aka 1432/4
10250                  * would mean 300+ stream seq's would have to be reported in
10251                  * one FWD-TSN. With a bit of work we can later FIX this to
10252                  * optimize and pull out duplcates.. but it does add more
10253                  * overhead. So for now... not!
10254                  */
10255                 at = TAILQ_FIRST(&asoc->sent_queue);
10256                 for (i = 0; i < cnt_of_skipped; i++) {
10257                         tp1 = TAILQ_NEXT(at, sctp_next);
10258                         if (tp1 == NULL)
10259                                 break;
10260                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10261                                 /* We don't report these */
10262                                 i--;
10263                                 at = tp1;
10264                                 continue;
10265                         }
10266                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10267                                 at->rec.data.fwd_tsn_cnt = 0;
10268                         }
10269                         strseq->stream = ntohs(at->rec.data.stream_number);
10270                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10271                         strseq++;
10272                         at = tp1;
10273                 }
10274         }
10275         return;
10276 }
10277
10278 void
10279 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10280 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10281     SCTP_UNUSED
10282 #endif
10283 )
10284 {
10285         /*-
10286          * Queue up a SACK or NR-SACK in the control queue.
10287          * We must first check to see if a SACK or NR-SACK is
10288          * somehow on the control queue.
10289          * If so, we will take and and remove the old one.
10290          */
10291         struct sctp_association *asoc;
10292         struct sctp_tmit_chunk *chk, *a_chk;
10293         struct sctp_sack_chunk *sack;
10294         struct sctp_nr_sack_chunk *nr_sack;
10295         struct sctp_gap_ack_block *gap_descriptor;
10296         struct sack_track *selector;
10297         int mergeable = 0;
10298         int offset;
10299         caddr_t limit;
10300         uint32_t *dup;
10301         int limit_reached = 0;
10302         unsigned int i, siz, j;
10303         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10304         int num_dups = 0;
10305         int space_req;
10306         uint32_t highest_tsn;
10307         uint8_t flags;
10308         uint8_t type;
10309         uint8_t tsn_map;
10310
10311         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10312             (stcb->asoc.peer_supports_nr_sack == 1)) {
10313                 type = SCTP_NR_SELECTIVE_ACK;
10314         } else {
10315                 type = SCTP_SELECTIVE_ACK;
10316         }
10317         a_chk = NULL;
10318         asoc = &stcb->asoc;
10319         SCTP_TCB_LOCK_ASSERT(stcb);
10320         if (asoc->last_data_chunk_from == NULL) {
10321                 /* Hmm we never received anything */
10322                 return;
10323         }
10324         sctp_slide_mapping_arrays(stcb);
10325         sctp_set_rwnd(stcb, asoc);
10326         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10327                 if (chk->rec.chunk_id.id == type) {
10328                         /* Hmm, found a sack already on queue, remove it */
10329                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10330                         asoc->ctrl_queue_cnt--;
10331                         a_chk = chk;
10332                         if (a_chk->data) {
10333                                 sctp_m_freem(a_chk->data);
10334                                 a_chk->data = NULL;
10335                         }
10336                         if (a_chk->whoTo) {
10337                                 sctp_free_remote_addr(a_chk->whoTo);
10338                                 a_chk->whoTo = NULL;
10339                         }
10340                         break;
10341                 }
10342         }
10343         if (a_chk == NULL) {
10344                 sctp_alloc_a_chunk(stcb, a_chk);
10345                 if (a_chk == NULL) {
10346                         /* No memory so we drop the idea, and set a timer */
10347                         if (stcb->asoc.delayed_ack) {
10348                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10349                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10350                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10351                                     stcb->sctp_ep, stcb, NULL);
10352                         } else {
10353                                 stcb->asoc.send_sack = 1;
10354                         }
10355                         return;
10356                 }
10357                 a_chk->copy_by_ref = 0;
10358                 a_chk->rec.chunk_id.id = type;
10359                 a_chk->rec.chunk_id.can_take_data = 1;
10360         }
10361         /* Clear our pkt counts */
10362         asoc->data_pkts_seen = 0;
10363
10364         a_chk->asoc = asoc;
10365         a_chk->snd_count = 0;
10366         a_chk->send_size = 0;   /* fill in later */
10367         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10368         a_chk->whoTo = NULL;
10369
10370         if ((asoc->numduptsns) ||
10371             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10372                 /*-
10373                  * Ok, we have some duplicates or the destination for the
10374                  * sack is unreachable, lets see if we can select an
10375                  * alternate than asoc->last_data_chunk_from
10376                  */
10377                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10378                     (asoc->used_alt_onsack > asoc->numnets)) {
10379                         /* We used an alt last time, don't this time */
10380                         a_chk->whoTo = NULL;
10381                 } else {
10382                         asoc->used_alt_onsack++;
10383                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10384                 }
10385                 if (a_chk->whoTo == NULL) {
10386                         /* Nope, no alternate */
10387                         a_chk->whoTo = asoc->last_data_chunk_from;
10388                         asoc->used_alt_onsack = 0;
10389                 }
10390         } else {
10391                 /*
10392                  * No duplicates so we use the last place we received data
10393                  * from.
10394                  */
10395                 asoc->used_alt_onsack = 0;
10396                 a_chk->whoTo = asoc->last_data_chunk_from;
10397         }
10398         if (a_chk->whoTo) {
10399                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10400         }
10401         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10402                 highest_tsn = asoc->highest_tsn_inside_map;
10403         } else {
10404                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10405         }
10406         if (highest_tsn == asoc->cumulative_tsn) {
10407                 /* no gaps */
10408                 if (type == SCTP_SELECTIVE_ACK) {
10409                         space_req = sizeof(struct sctp_sack_chunk);
10410                 } else {
10411                         space_req = sizeof(struct sctp_nr_sack_chunk);
10412                 }
10413         } else {
10414                 /* gaps get a cluster */
10415                 space_req = MCLBYTES;
10416         }
10417         /* Ok now lets formulate a MBUF with our sack */
10418         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10419         if ((a_chk->data == NULL) ||
10420             (a_chk->whoTo == NULL)) {
10421                 /* rats, no mbuf memory */
10422                 if (a_chk->data) {
10423                         /* was a problem with the destination */
10424                         sctp_m_freem(a_chk->data);
10425                         a_chk->data = NULL;
10426                 }
10427                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10428                 /* sa_ignore NO_NULL_CHK */
10429                 if (stcb->asoc.delayed_ack) {
10430                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10431                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10432                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10433                             stcb->sctp_ep, stcb, NULL);
10434                 } else {
10435                         stcb->asoc.send_sack = 1;
10436                 }
10437                 return;
10438         }
10439         /* ok, lets go through and fill it in */
10440         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10441         space = M_TRAILINGSPACE(a_chk->data);
10442         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10443                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10444         }
10445         limit = mtod(a_chk->data, caddr_t);
10446         limit += space;
10447
10448         flags = 0;
10449
10450         if ((asoc->sctp_cmt_on_off > 0) &&
10451             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10452                 /*-
10453                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10454                  * received, then set high bit to 1, else 0. Reset
10455                  * pkts_rcvd.
10456                  */
10457                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10458                 asoc->cmt_dac_pkts_rcvd = 0;
10459         }
10460 #ifdef SCTP_ASOCLOG_OF_TSNS
10461         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10462         stcb->asoc.cumack_log_atsnt++;
10463         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10464                 stcb->asoc.cumack_log_atsnt = 0;
10465         }
10466 #endif
10467         /* reset the readers interpretation */
10468         stcb->freed_by_sorcv_sincelast = 0;
10469
10470         if (type == SCTP_SELECTIVE_ACK) {
10471                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10472                 nr_sack = NULL;
10473                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10474                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10475                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10476                 } else {
10477                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10478                 }
10479         } else {
10480                 sack = NULL;
10481                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10482                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10483                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10484                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10485                 } else {
10486                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10487                 }
10488         }
10489
10490         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10491                 offset = 1;
10492         } else {
10493                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10494         }
10495         if (((type == SCTP_SELECTIVE_ACK) &&
10496             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10497             ((type == SCTP_NR_SELECTIVE_ACK) &&
10498             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10499                 /* we have a gap .. maybe */
10500                 for (i = 0; i < siz; i++) {
10501                         tsn_map = asoc->mapping_array[i];
10502                         if (type == SCTP_SELECTIVE_ACK) {
10503                                 tsn_map |= asoc->nr_mapping_array[i];
10504                         }
10505                         if (i == 0) {
10506                                 /*
10507                                  * Clear all bits corresponding to TSNs
10508                                  * smaller or equal to the cumulative TSN.
10509                                  */
10510                                 tsn_map &= (~0 << (1 - offset));
10511                         }
10512                         selector = &sack_array[tsn_map];
10513                         if (mergeable && selector->right_edge) {
10514                                 /*
10515                                  * Backup, left and right edges were ok to
10516                                  * merge.
10517                                  */
10518                                 num_gap_blocks--;
10519                                 gap_descriptor--;
10520                         }
10521                         if (selector->num_entries == 0)
10522                                 mergeable = 0;
10523                         else {
10524                                 for (j = 0; j < selector->num_entries; j++) {
10525                                         if (mergeable && selector->right_edge) {
10526                                                 /*
10527                                                  * do a merge by NOT setting
10528                                                  * the left side
10529                                                  */
10530                                                 mergeable = 0;
10531                                         } else {
10532                                                 /*
10533                                                  * no merge, set the left
10534                                                  * side
10535                                                  */
10536                                                 mergeable = 0;
10537                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10538                                         }
10539                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10540                                         num_gap_blocks++;
10541                                         gap_descriptor++;
10542                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10543                                                 /* no more room */
10544                                                 limit_reached = 1;
10545                                                 break;
10546                                         }
10547                                 }
10548                                 if (selector->left_edge) {
10549                                         mergeable = 1;
10550                                 }
10551                         }
10552                         if (limit_reached) {
10553                                 /* Reached the limit stop */
10554                                 break;
10555                         }
10556                         offset += 8;
10557                 }
10558         }
10559         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10560             (limit_reached == 0)) {
10561
10562                 mergeable = 0;
10563
10564                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10565                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10566                 } else {
10567                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10568                 }
10569
10570                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10571                         offset = 1;
10572                 } else {
10573                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10574                 }
10575                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10576                         /* we have a gap .. maybe */
10577                         for (i = 0; i < siz; i++) {
10578                                 tsn_map = asoc->nr_mapping_array[i];
10579                                 if (i == 0) {
10580                                         /*
10581                                          * Clear all bits corresponding to
10582                                          * TSNs smaller or equal to the
10583                                          * cumulative TSN.
10584                                          */
10585                                         tsn_map &= (~0 << (1 - offset));
10586                                 }
10587                                 selector = &sack_array[tsn_map];
10588                                 if (mergeable && selector->right_edge) {
10589                                         /*
10590                                          * Backup, left and right edges were
10591                                          * ok to merge.
10592                                          */
10593                                         num_nr_gap_blocks--;
10594                                         gap_descriptor--;
10595                                 }
10596                                 if (selector->num_entries == 0)
10597                                         mergeable = 0;
10598                                 else {
10599                                         for (j = 0; j < selector->num_entries; j++) {
10600                                                 if (mergeable && selector->right_edge) {
10601                                                         /*
10602                                                          * do a merge by NOT
10603                                                          * setting the left
10604                                                          * side
10605                                                          */
10606                                                         mergeable = 0;
10607                                                 } else {
10608                                                         /*
10609                                                          * no merge, set the
10610                                                          * left side
10611                                                          */
10612                                                         mergeable = 0;
10613                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10614                                                 }
10615                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10616                                                 num_nr_gap_blocks++;
10617                                                 gap_descriptor++;
10618                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10619                                                         /* no more room */
10620                                                         limit_reached = 1;
10621                                                         break;
10622                                                 }
10623                                         }
10624                                         if (selector->left_edge) {
10625                                                 mergeable = 1;
10626                                         }
10627                                 }
10628                                 if (limit_reached) {
10629                                         /* Reached the limit stop */
10630                                         break;
10631                                 }
10632                                 offset += 8;
10633                         }
10634                 }
10635         }
10636         /* now we must add any dups we are going to report. */
10637         if ((limit_reached == 0) && (asoc->numduptsns)) {
10638                 dup = (uint32_t *) gap_descriptor;
10639                 for (i = 0; i < asoc->numduptsns; i++) {
10640                         *dup = htonl(asoc->dup_tsns[i]);
10641                         dup++;
10642                         num_dups++;
10643                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10644                                 /* no more room */
10645                                 break;
10646                         }
10647                 }
10648                 asoc->numduptsns = 0;
10649         }
10650         /*
10651          * now that the chunk is prepared queue it to the control chunk
10652          * queue.
10653          */
10654         if (type == SCTP_SELECTIVE_ACK) {
10655                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10656                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10657                     num_dups * sizeof(int32_t);
10658                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10659                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10660                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10661                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10662                 sack->sack.num_dup_tsns = htons(num_dups);
10663                 sack->ch.chunk_type = type;
10664                 sack->ch.chunk_flags = flags;
10665                 sack->ch.chunk_length = htons(a_chk->send_size);
10666         } else {
10667                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10668                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10669                     num_dups * sizeof(int32_t);
10670                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10671                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10672                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10673                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10674                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10675                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10676                 nr_sack->nr_sack.reserved = 0;
10677                 nr_sack->ch.chunk_type = type;
10678                 nr_sack->ch.chunk_flags = flags;
10679                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10680         }
10681         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10682         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10683         asoc->ctrl_queue_cnt++;
10684         asoc->send_sack = 0;
10685         SCTP_STAT_INCR(sctps_sendsacks);
10686         return;
10687 }
10688
10689 void
10690 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10691 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10692     SCTP_UNUSED
10693 #endif
10694 )
10695 {
10696         struct mbuf *m_abort;
10697         struct mbuf *m_out = NULL, *m_end = NULL;
10698         struct sctp_abort_chunk *abort = NULL;
10699         int sz;
10700         uint32_t auth_offset = 0;
10701         struct sctp_auth_chunk *auth = NULL;
10702         struct sctp_nets *net;
10703
10704         /*-
10705          * Add an AUTH chunk, if chunk requires it and save the offset into
10706          * the chain for AUTH
10707          */
10708         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10709             stcb->asoc.peer_auth_chunks)) {
10710                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10711                     stcb, SCTP_ABORT_ASSOCIATION);
10712                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10713         }
10714         SCTP_TCB_LOCK_ASSERT(stcb);
10715         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10716         if (m_abort == NULL) {
10717                 /* no mbuf's */
10718                 if (m_out)
10719                         sctp_m_freem(m_out);
10720                 return;
10721         }
10722         /* link in any error */
10723         SCTP_BUF_NEXT(m_abort) = operr;
10724         sz = 0;
10725         if (operr) {
10726                 struct mbuf *n;
10727
10728                 n = operr;
10729                 while (n) {
10730                         sz += SCTP_BUF_LEN(n);
10731                         n = SCTP_BUF_NEXT(n);
10732                 }
10733         }
10734         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10735         if (m_out == NULL) {
10736                 /* NO Auth chunk prepended, so reserve space in front */
10737                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10738                 m_out = m_abort;
10739         } else {
10740                 /* Put AUTH chunk at the front of the chain */
10741                 SCTP_BUF_NEXT(m_end) = m_abort;
10742         }
10743         if (stcb->asoc.alternate) {
10744                 net = stcb->asoc.alternate;
10745         } else {
10746                 net = stcb->asoc.primary_destination;
10747         }
10748         /* fill in the ABORT chunk */
10749         abort = mtod(m_abort, struct sctp_abort_chunk *);
10750         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10751         abort->ch.chunk_flags = 0;
10752         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10753
10754         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10755             (struct sockaddr *)&net->ro._l_addr,
10756             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10757             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10758             stcb->asoc.primary_destination->port, NULL,
10759             0, 0,
10760             so_locked);
10761         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10762 }
10763
10764 void
10765 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10766     struct sctp_nets *net,
10767     int reflect_vtag)
10768 {
10769         /* formulate and SEND a SHUTDOWN-COMPLETE */
10770         struct mbuf *m_shutdown_comp;
10771         struct sctp_shutdown_complete_chunk *shutdown_complete;
10772         uint32_t vtag;
10773         uint8_t flags;
10774
10775         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10776         if (m_shutdown_comp == NULL) {
10777                 /* no mbuf's */
10778                 return;
10779         }
10780         if (reflect_vtag) {
10781                 flags = SCTP_HAD_NO_TCB;
10782                 vtag = stcb->asoc.my_vtag;
10783         } else {
10784                 flags = 0;
10785                 vtag = stcb->asoc.peer_vtag;
10786         }
10787         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10788         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10789         shutdown_complete->ch.chunk_flags = flags;
10790         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10791         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10792         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10793             (struct sockaddr *)&net->ro._l_addr,
10794             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10795             stcb->sctp_ep->sctp_lport, stcb->rport,
10796             htonl(vtag),
10797             net->port, NULL,
10798             0, 0,
10799             SCTP_SO_NOT_LOCKED);
10800         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10801         return;
10802 }
10803
10804 static void
10805 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10806     struct sctphdr *sh, uint32_t vtag,
10807     uint8_t type, struct mbuf *cause,
10808     uint8_t use_mflowid, uint32_t mflowid,
10809     uint32_t vrf_id, uint16_t port)
10810 {
10811         struct mbuf *o_pak;
10812         struct mbuf *mout;
10813         struct sctphdr *shout;
10814         struct sctp_chunkhdr *ch;
10815         struct udphdr *udp;
10816         int len, cause_len, padding_len, ret;
10817
10818 #ifdef INET
10819         struct sockaddr_in *src_sin, *dst_sin;
10820         struct ip *ip;
10821
10822 #endif
10823 #ifdef INET6
10824         struct sockaddr_in6 *src_sin6, *dst_sin6;
10825         struct ip6_hdr *ip6;
10826
10827 #endif
10828
10829         /* Compute the length of the cause and add final padding. */
10830         cause_len = 0;
10831         if (cause != NULL) {
10832                 struct mbuf *m_at, *m_last = NULL;
10833
10834                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10835                         if (SCTP_BUF_NEXT(m_at) == NULL)
10836                                 m_last = m_at;
10837                         cause_len += SCTP_BUF_LEN(m_at);
10838                 }
10839                 padding_len = cause_len % 4;
10840                 if (padding_len != 0) {
10841                         padding_len = 4 - padding_len;
10842                 }
10843                 if (padding_len != 0) {
10844                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10845                                 sctp_m_freem(cause);
10846                                 return;
10847                         }
10848                 }
10849         } else {
10850                 padding_len = 0;
10851         }
10852         /* Get an mbuf for the header. */
10853         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10854         switch (dst->sa_family) {
10855 #ifdef INET
10856         case AF_INET:
10857                 len += sizeof(struct ip);
10858                 break;
10859 #endif
10860 #ifdef INET6
10861         case AF_INET6:
10862                 len += sizeof(struct ip6_hdr);
10863                 break;
10864 #endif
10865         default:
10866                 break;
10867         }
10868         if (port) {
10869                 len += sizeof(struct udphdr);
10870         }
10871         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10872         if (mout == NULL) {
10873                 if (cause) {
10874                         sctp_m_freem(cause);
10875                 }
10876                 return;
10877         }
10878         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10879         SCTP_BUF_LEN(mout) = len;
10880         SCTP_BUF_NEXT(mout) = cause;
10881         if (use_mflowid != 0) {
10882                 mout->m_pkthdr.flowid = mflowid;
10883                 mout->m_flags |= M_FLOWID;
10884         }
10885 #ifdef INET
10886         ip = NULL;
10887 #endif
10888 #ifdef INET6
10889         ip6 = NULL;
10890 #endif
10891         switch (dst->sa_family) {
10892 #ifdef INET
10893         case AF_INET:
10894                 src_sin = (struct sockaddr_in *)src;
10895                 dst_sin = (struct sockaddr_in *)dst;
10896                 ip = mtod(mout, struct ip *);
10897                 ip->ip_v = IPVERSION;
10898                 ip->ip_hl = (sizeof(struct ip) >> 2);
10899                 ip->ip_tos = 0;
10900                 ip->ip_id = ip_newid();
10901                 ip->ip_off = 0;
10902                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10903                 if (port) {
10904                         ip->ip_p = IPPROTO_UDP;
10905                 } else {
10906                         ip->ip_p = IPPROTO_SCTP;
10907                 }
10908                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10909                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10910                 ip->ip_sum = 0;
10911                 len = sizeof(struct ip);
10912                 shout = (struct sctphdr *)((caddr_t)ip + len);
10913                 break;
10914 #endif
10915 #ifdef INET6
10916         case AF_INET6:
10917                 src_sin6 = (struct sockaddr_in6 *)src;
10918                 dst_sin6 = (struct sockaddr_in6 *)dst;
10919                 ip6 = mtod(mout, struct ip6_hdr *);
10920                 ip6->ip6_flow = htonl(0x60000000);
10921                 if (V_ip6_auto_flowlabel) {
10922                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10923                 }
10924                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10925                 if (port) {
10926                         ip6->ip6_nxt = IPPROTO_UDP;
10927                 } else {
10928                         ip6->ip6_nxt = IPPROTO_SCTP;
10929                 }
10930                 ip6->ip6_src = dst_sin6->sin6_addr;
10931                 ip6->ip6_dst = src_sin6->sin6_addr;
10932                 len = sizeof(struct ip6_hdr);
10933                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
10934                 break;
10935 #endif
10936         default:
10937                 len = 0;
10938                 shout = mtod(mout, struct sctphdr *);
10939                 break;
10940         }
10941         if (port) {
10942                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10943                         sctp_m_freem(mout);
10944                         return;
10945                 }
10946                 udp = (struct udphdr *)shout;
10947                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10948                 udp->uh_dport = port;
10949                 udp->uh_sum = 0;
10950                 udp->uh_ulen = htons(sizeof(struct udphdr) +
10951                     sizeof(struct sctphdr) +
10952                     sizeof(struct sctp_chunkhdr) +
10953                     cause_len + padding_len);
10954                 len += sizeof(struct udphdr);
10955                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
10956         } else {
10957                 udp = NULL;
10958         }
10959         shout->src_port = sh->dest_port;
10960         shout->dest_port = sh->src_port;
10961         shout->checksum = 0;
10962         if (vtag) {
10963                 shout->v_tag = htonl(vtag);
10964         } else {
10965                 shout->v_tag = sh->v_tag;
10966         }
10967         len += sizeof(struct sctphdr);
10968         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
10969         ch->chunk_type = type;
10970         if (vtag) {
10971                 ch->chunk_flags = 0;
10972         } else {
10973                 ch->chunk_flags = SCTP_HAD_NO_TCB;
10974         }
10975         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
10976         len += sizeof(struct sctp_chunkhdr);
10977         len += cause_len + padding_len;
10978
10979         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10980                 sctp_m_freem(mout);
10981                 return;
10982         }
10983         SCTP_ATTACH_CHAIN(o_pak, mout, len);
10984         switch (dst->sa_family) {
10985 #ifdef INET
10986         case AF_INET:
10987                 if (port) {
10988                         if (V_udp_cksum) {
10989                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10990                         } else {
10991                                 udp->uh_sum = 0;
10992                         }
10993                 }
10994                 ip->ip_len = len;
10995                 if (port) {
10996 #if defined(SCTP_WITH_NO_CSUM)
10997                         SCTP_STAT_INCR(sctps_sendnocrc);
10998 #else
10999                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11000                         SCTP_STAT_INCR(sctps_sendswcrc);
11001 #endif
11002                         if (V_udp_cksum) {
11003                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11004                         }
11005                 } else {
11006 #if defined(SCTP_WITH_NO_CSUM)
11007                         SCTP_STAT_INCR(sctps_sendnocrc);
11008 #else
11009                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11010                         mout->m_pkthdr.csum_data = 0;
11011                         SCTP_STAT_INCR(sctps_sendhwcrc);
11012 #endif
11013                 }
11014 #ifdef SCTP_PACKET_LOGGING
11015                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11016                         sctp_packet_log(o_pak);
11017                 }
11018 #endif
11019                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11020                 break;
11021 #endif
11022 #ifdef INET6
11023         case AF_INET6:
11024                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11025                 if (port) {
11026 #if defined(SCTP_WITH_NO_CSUM)
11027                         SCTP_STAT_INCR(sctps_sendnocrc);
11028 #else
11029                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11030                         SCTP_STAT_INCR(sctps_sendswcrc);
11031 #endif
11032                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11033                                 udp->uh_sum = 0xffff;
11034                         }
11035                 } else {
11036 #if defined(SCTP_WITH_NO_CSUM)
11037                         SCTP_STAT_INCR(sctps_sendnocrc);
11038 #else
11039                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11040                         mout->m_pkthdr.csum_data = 0;
11041                         SCTP_STAT_INCR(sctps_sendhwcrc);
11042 #endif
11043                 }
11044 #ifdef SCTP_PACKET_LOGGING
11045                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11046                         sctp_packet_log(o_pak);
11047                 }
11048 #endif
11049                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11050                 break;
11051 #endif
11052         default:
11053                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11054                     dst->sa_family);
11055                 sctp_m_freem(mout);
11056                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11057                 return;
11058         }
11059         SCTP_STAT_INCR(sctps_sendpackets);
11060         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11061         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11062         return;
11063 }
11064
11065 void
11066 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11067     struct sctphdr *sh,
11068     uint8_t use_mflowid, uint32_t mflowid,
11069     uint32_t vrf_id, uint16_t port)
11070 {
11071         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11072             use_mflowid, mflowid,
11073             vrf_id, port);
11074 }
11075
11076 void
11077 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11078 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11079     SCTP_UNUSED
11080 #endif
11081 )
11082 {
11083         struct sctp_tmit_chunk *chk;
11084         struct sctp_heartbeat_chunk *hb;
11085         struct timeval now;
11086
11087         SCTP_TCB_LOCK_ASSERT(stcb);
11088         if (net == NULL) {
11089                 return;
11090         }
11091         (void)SCTP_GETTIME_TIMEVAL(&now);
11092         switch (net->ro._l_addr.sa.sa_family) {
11093 #ifdef INET
11094         case AF_INET:
11095                 break;
11096 #endif
11097 #ifdef INET6
11098         case AF_INET6:
11099                 break;
11100 #endif
11101         default:
11102                 return;
11103         }
11104         sctp_alloc_a_chunk(stcb, chk);
11105         if (chk == NULL) {
11106                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11107                 return;
11108         }
11109         chk->copy_by_ref = 0;
11110         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11111         chk->rec.chunk_id.can_take_data = 1;
11112         chk->asoc = &stcb->asoc;
11113         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11114
11115         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11116         if (chk->data == NULL) {
11117                 sctp_free_a_chunk(stcb, chk, so_locked);
11118                 return;
11119         }
11120         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11121         SCTP_BUF_LEN(chk->data) = chk->send_size;
11122         chk->sent = SCTP_DATAGRAM_UNSENT;
11123         chk->snd_count = 0;
11124         chk->whoTo = net;
11125         atomic_add_int(&chk->whoTo->ref_count, 1);
11126         /* Now we have a mbuf that we can fill in with the details */
11127         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11128         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11129         /* fill out chunk header */
11130         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11131         hb->ch.chunk_flags = 0;
11132         hb->ch.chunk_length = htons(chk->send_size);
11133         /* Fill out hb parameter */
11134         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11135         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11136         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11137         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11138         /* Did our user request this one, put it in */
11139         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11140         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11141         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11142                 /*
11143                  * we only take from the entropy pool if the address is not
11144                  * confirmed.
11145                  */
11146                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11147                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11148         } else {
11149                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11150                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11151         }
11152         switch (net->ro._l_addr.sa.sa_family) {
11153 #ifdef INET
11154         case AF_INET:
11155                 memcpy(hb->heartbeat.hb_info.address,
11156                     &net->ro._l_addr.sin.sin_addr,
11157                     sizeof(net->ro._l_addr.sin.sin_addr));
11158                 break;
11159 #endif
11160 #ifdef INET6
11161         case AF_INET6:
11162                 memcpy(hb->heartbeat.hb_info.address,
11163                     &net->ro._l_addr.sin6.sin6_addr,
11164                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11165                 break;
11166 #endif
11167         default:
11168                 return;
11169                 break;
11170         }
11171         net->hb_responded = 0;
11172         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11173         stcb->asoc.ctrl_queue_cnt++;
11174         SCTP_STAT_INCR(sctps_sendheartbeat);
11175         return;
11176 }
11177
11178 void
11179 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11180     uint32_t high_tsn)
11181 {
11182         struct sctp_association *asoc;
11183         struct sctp_ecne_chunk *ecne;
11184         struct sctp_tmit_chunk *chk;
11185
11186         if (net == NULL) {
11187                 return;
11188         }
11189         asoc = &stcb->asoc;
11190         SCTP_TCB_LOCK_ASSERT(stcb);
11191         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11192                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11193                         /* found a previous ECN_ECHO update it if needed */
11194                         uint32_t cnt, ctsn;
11195
11196                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11197                         ctsn = ntohl(ecne->tsn);
11198                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11199                                 ecne->tsn = htonl(high_tsn);
11200                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11201                         }
11202                         cnt = ntohl(ecne->num_pkts_since_cwr);
11203                         cnt++;
11204                         ecne->num_pkts_since_cwr = htonl(cnt);
11205                         return;
11206                 }
11207         }
11208         /* nope could not find one to update so we must build one */
11209         sctp_alloc_a_chunk(stcb, chk);
11210         if (chk == NULL) {
11211                 return;
11212         }
11213         chk->copy_by_ref = 0;
11214         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11215         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11216         chk->rec.chunk_id.can_take_data = 0;
11217         chk->asoc = &stcb->asoc;
11218         chk->send_size = sizeof(struct sctp_ecne_chunk);
11219         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11220         if (chk->data == NULL) {
11221                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11222                 return;
11223         }
11224         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11225         SCTP_BUF_LEN(chk->data) = chk->send_size;
11226         chk->sent = SCTP_DATAGRAM_UNSENT;
11227         chk->snd_count = 0;
11228         chk->whoTo = net;
11229         atomic_add_int(&chk->whoTo->ref_count, 1);
11230
11231         stcb->asoc.ecn_echo_cnt_onq++;
11232         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11233         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11234         ecne->ch.chunk_flags = 0;
11235         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11236         ecne->tsn = htonl(high_tsn);
11237         ecne->num_pkts_since_cwr = htonl(1);
11238         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11239         asoc->ctrl_queue_cnt++;
11240 }
11241
11242 void
11243 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11244     struct mbuf *m, int len, int iphlen, int bad_crc)
11245 {
11246         struct sctp_association *asoc;
11247         struct sctp_pktdrop_chunk *drp;
11248         struct sctp_tmit_chunk *chk;
11249         uint8_t *datap;
11250         int was_trunc = 0;
11251         int fullsz = 0;
11252         long spc;
11253         int offset;
11254         struct sctp_chunkhdr *ch, chunk_buf;
11255         unsigned int chk_length;
11256
11257         if (!stcb) {
11258                 return;
11259         }
11260         asoc = &stcb->asoc;
11261         SCTP_TCB_LOCK_ASSERT(stcb);
11262         if (asoc->peer_supports_pktdrop == 0) {
11263                 /*-
11264                  * peer must declare support before I send one.
11265                  */
11266                 return;
11267         }
11268         if (stcb->sctp_socket == NULL) {
11269                 return;
11270         }
11271         sctp_alloc_a_chunk(stcb, chk);
11272         if (chk == NULL) {
11273                 return;
11274         }
11275         chk->copy_by_ref = 0;
11276         len -= iphlen;
11277         chk->send_size = len;
11278         /* Validate that we do not have an ABORT in here. */
11279         offset = iphlen + sizeof(struct sctphdr);
11280         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11281             sizeof(*ch), (uint8_t *) & chunk_buf);
11282         while (ch != NULL) {
11283                 chk_length = ntohs(ch->chunk_length);
11284                 if (chk_length < sizeof(*ch)) {
11285                         /* break to abort land */
11286                         break;
11287                 }
11288                 switch (ch->chunk_type) {
11289                 case SCTP_PACKET_DROPPED:
11290                 case SCTP_ABORT_ASSOCIATION:
11291                 case SCTP_INITIATION_ACK:
11292                         /**
11293                          * We don't respond with an PKT-DROP to an ABORT
11294                          * or PKT-DROP. We also do not respond to an
11295                          * INIT-ACK, because we can't know if the initiation
11296                          * tag is correct or not.
11297                          */
11298                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11299                         return;
11300                 default:
11301                         break;
11302                 }
11303                 offset += SCTP_SIZE32(chk_length);
11304                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11305                     sizeof(*ch), (uint8_t *) & chunk_buf);
11306         }
11307
11308         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11309             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11310                 /*
11311                  * only send 1 mtu worth, trim off the excess on the end.
11312                  */
11313                 fullsz = len;
11314                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11315                 was_trunc = 1;
11316         }
11317         chk->asoc = &stcb->asoc;
11318         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11319         if (chk->data == NULL) {
11320 jump_out:
11321                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11322                 return;
11323         }
11324         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11325         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11326         if (drp == NULL) {
11327                 sctp_m_freem(chk->data);
11328                 chk->data = NULL;
11329                 goto jump_out;
11330         }
11331         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11332             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11333         chk->book_size_scale = 0;
11334         if (was_trunc) {
11335                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11336                 drp->trunc_len = htons(fullsz);
11337                 /*
11338                  * Len is already adjusted to size minus overhead above take
11339                  * out the pkt_drop chunk itself from it.
11340                  */
11341                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11342                 len = chk->send_size;
11343         } else {
11344                 /* no truncation needed */
11345                 drp->ch.chunk_flags = 0;
11346                 drp->trunc_len = htons(0);
11347         }
11348         if (bad_crc) {
11349                 drp->ch.chunk_flags |= SCTP_BADCRC;
11350         }
11351         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11352         SCTP_BUF_LEN(chk->data) = chk->send_size;
11353         chk->sent = SCTP_DATAGRAM_UNSENT;
11354         chk->snd_count = 0;
11355         if (net) {
11356                 /* we should hit here */
11357                 chk->whoTo = net;
11358                 atomic_add_int(&chk->whoTo->ref_count, 1);
11359         } else {
11360                 chk->whoTo = NULL;
11361         }
11362         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11363         chk->rec.chunk_id.can_take_data = 1;
11364         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11365         drp->ch.chunk_length = htons(chk->send_size);
11366         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11367         if (spc < 0) {
11368                 spc = 0;
11369         }
11370         drp->bottle_bw = htonl(spc);
11371         if (asoc->my_rwnd) {
11372                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11373                     asoc->size_on_all_streams +
11374                     asoc->my_rwnd_control_len +
11375                     stcb->sctp_socket->so_rcv.sb_cc);
11376         } else {
11377                 /*-
11378                  * If my rwnd is 0, possibly from mbuf depletion as well as
11379                  * space used, tell the peer there is NO space aka onq == bw
11380                  */
11381                 drp->current_onq = htonl(spc);
11382         }
11383         drp->reserved = 0;
11384         datap = drp->data;
11385         m_copydata(m, iphlen, len, (caddr_t)datap);
11386         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11387         asoc->ctrl_queue_cnt++;
11388 }
11389
11390 void
11391 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11392 {
11393         struct sctp_association *asoc;
11394         struct sctp_cwr_chunk *cwr;
11395         struct sctp_tmit_chunk *chk;
11396
11397         SCTP_TCB_LOCK_ASSERT(stcb);
11398         if (net == NULL) {
11399                 return;
11400         }
11401         asoc = &stcb->asoc;
11402         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11403                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11404                         /*
11405                          * found a previous CWR queued to same destination
11406                          * update it if needed
11407                          */
11408                         uint32_t ctsn;
11409
11410                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11411                         ctsn = ntohl(cwr->tsn);
11412                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11413                                 cwr->tsn = htonl(high_tsn);
11414                         }
11415                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11416                                 /* Make sure override is carried */
11417                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11418                         }
11419                         return;
11420                 }
11421         }
11422         sctp_alloc_a_chunk(stcb, chk);
11423         if (chk == NULL) {
11424                 return;
11425         }
11426         chk->copy_by_ref = 0;
11427         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11428         chk->rec.chunk_id.can_take_data = 1;
11429         chk->asoc = &stcb->asoc;
11430         chk->send_size = sizeof(struct sctp_cwr_chunk);
11431         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11432         if (chk->data == NULL) {
11433                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11434                 return;
11435         }
11436         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11437         SCTP_BUF_LEN(chk->data) = chk->send_size;
11438         chk->sent = SCTP_DATAGRAM_UNSENT;
11439         chk->snd_count = 0;
11440         chk->whoTo = net;
11441         atomic_add_int(&chk->whoTo->ref_count, 1);
11442         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11443         cwr->ch.chunk_type = SCTP_ECN_CWR;
11444         cwr->ch.chunk_flags = override;
11445         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11446         cwr->tsn = htonl(high_tsn);
11447         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11448         asoc->ctrl_queue_cnt++;
11449 }
11450
11451 void
11452 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11453     int number_entries, uint16_t * list,
11454     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11455 {
11456         uint16_t len, old_len, i;
11457         struct sctp_stream_reset_out_request *req_out;
11458         struct sctp_chunkhdr *ch;
11459
11460         ch = mtod(chk->data, struct sctp_chunkhdr *);
11461         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11462
11463         /* get to new offset for the param. */
11464         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11465         /* now how long will this param be? */
11466         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11467         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11468         req_out->ph.param_length = htons(len);
11469         req_out->request_seq = htonl(seq);
11470         req_out->response_seq = htonl(resp_seq);
11471         req_out->send_reset_at_tsn = htonl(last_sent);
11472         if (number_entries) {
11473                 for (i = 0; i < number_entries; i++) {
11474                         req_out->list_of_streams[i] = htons(list[i]);
11475                 }
11476         }
11477         if (SCTP_SIZE32(len) > len) {
11478                 /*-
11479                  * Need to worry about the pad we may end up adding to the
11480                  * end. This is easy since the struct is either aligned to 4
11481                  * bytes or 2 bytes off.
11482                  */
11483                 req_out->list_of_streams[number_entries] = 0;
11484         }
11485         /* now fix the chunk length */
11486         ch->chunk_length = htons(len + old_len);
11487         chk->book_size = len + old_len;
11488         chk->book_size_scale = 0;
11489         chk->send_size = SCTP_SIZE32(chk->book_size);
11490         SCTP_BUF_LEN(chk->data) = chk->send_size;
11491         return;
11492 }
11493
11494 static void
11495 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11496     int number_entries, uint16_t * list,
11497     uint32_t seq)
11498 {
11499         uint16_t len, old_len, i;
11500         struct sctp_stream_reset_in_request *req_in;
11501         struct sctp_chunkhdr *ch;
11502
11503         ch = mtod(chk->data, struct sctp_chunkhdr *);
11504         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11505
11506         /* get to new offset for the param. */
11507         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11508         /* now how long will this param be? */
11509         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11510         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11511         req_in->ph.param_length = htons(len);
11512         req_in->request_seq = htonl(seq);
11513         if (number_entries) {
11514                 for (i = 0; i < number_entries; i++) {
11515                         req_in->list_of_streams[i] = htons(list[i]);
11516                 }
11517         }
11518         if (SCTP_SIZE32(len) > len) {
11519                 /*-
11520                  * Need to worry about the pad we may end up adding to the
11521                  * end. This is easy since the struct is either aligned to 4
11522                  * bytes or 2 bytes off.
11523                  */
11524                 req_in->list_of_streams[number_entries] = 0;
11525         }
11526         /* now fix the chunk length */
11527         ch->chunk_length = htons(len + old_len);
11528         chk->book_size = len + old_len;
11529         chk->book_size_scale = 0;
11530         chk->send_size = SCTP_SIZE32(chk->book_size);
11531         SCTP_BUF_LEN(chk->data) = chk->send_size;
11532         return;
11533 }
11534
11535 static void
11536 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11537     uint32_t seq)
11538 {
11539         uint16_t len, old_len;
11540         struct sctp_stream_reset_tsn_request *req_tsn;
11541         struct sctp_chunkhdr *ch;
11542
11543         ch = mtod(chk->data, struct sctp_chunkhdr *);
11544         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11545
11546         /* get to new offset for the param. */
11547         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11548         /* now how long will this param be? */
11549         len = sizeof(struct sctp_stream_reset_tsn_request);
11550         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11551         req_tsn->ph.param_length = htons(len);
11552         req_tsn->request_seq = htonl(seq);
11553
11554         /* now fix the chunk length */
11555         ch->chunk_length = htons(len + old_len);
11556         chk->send_size = len + old_len;
11557         chk->book_size = SCTP_SIZE32(chk->send_size);
11558         chk->book_size_scale = 0;
11559         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11560         return;
11561 }
11562
11563 void
11564 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11565     uint32_t resp_seq, uint32_t result)
11566 {
11567         uint16_t len, old_len;
11568         struct sctp_stream_reset_response *resp;
11569         struct sctp_chunkhdr *ch;
11570
11571         ch = mtod(chk->data, struct sctp_chunkhdr *);
11572         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11573
11574         /* get to new offset for the param. */
11575         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11576         /* now how long will this param be? */
11577         len = sizeof(struct sctp_stream_reset_response);
11578         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11579         resp->ph.param_length = htons(len);
11580         resp->response_seq = htonl(resp_seq);
11581         resp->result = ntohl(result);
11582
11583         /* now fix the chunk length */
11584         ch->chunk_length = htons(len + old_len);
11585         chk->book_size = len + old_len;
11586         chk->book_size_scale = 0;
11587         chk->send_size = SCTP_SIZE32(chk->book_size);
11588         SCTP_BUF_LEN(chk->data) = chk->send_size;
11589         return;
11590 }
11591
11592 void
11593 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11594     uint32_t resp_seq, uint32_t result,
11595     uint32_t send_una, uint32_t recv_next)
11596 {
11597         uint16_t len, old_len;
11598         struct sctp_stream_reset_response_tsn *resp;
11599         struct sctp_chunkhdr *ch;
11600
11601         ch = mtod(chk->data, struct sctp_chunkhdr *);
11602         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11603
11604         /* get to new offset for the param. */
11605         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11606         /* now how long will this param be? */
11607         len = sizeof(struct sctp_stream_reset_response_tsn);
11608         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11609         resp->ph.param_length = htons(len);
11610         resp->response_seq = htonl(resp_seq);
11611         resp->result = htonl(result);
11612         resp->senders_next_tsn = htonl(send_una);
11613         resp->receivers_next_tsn = htonl(recv_next);
11614
11615         /* now fix the chunk length */
11616         ch->chunk_length = htons(len + old_len);
11617         chk->book_size = len + old_len;
11618         chk->send_size = SCTP_SIZE32(chk->book_size);
11619         chk->book_size_scale = 0;
11620         SCTP_BUF_LEN(chk->data) = chk->send_size;
11621         return;
11622 }
11623
11624 static void
11625 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11626     uint32_t seq,
11627     uint16_t adding)
11628 {
11629         uint16_t len, old_len;
11630         struct sctp_chunkhdr *ch;
11631         struct sctp_stream_reset_add_strm *addstr;
11632
11633         ch = mtod(chk->data, struct sctp_chunkhdr *);
11634         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11635
11636         /* get to new offset for the param. */
11637         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11638         /* now how long will this param be? */
11639         len = sizeof(struct sctp_stream_reset_add_strm);
11640
11641         /* Fill it out. */
11642         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11643         addstr->ph.param_length = htons(len);
11644         addstr->request_seq = htonl(seq);
11645         addstr->number_of_streams = htons(adding);
11646         addstr->reserved = 0;
11647
11648         /* now fix the chunk length */
11649         ch->chunk_length = htons(len + old_len);
11650         chk->send_size = len + old_len;
11651         chk->book_size = SCTP_SIZE32(chk->send_size);
11652         chk->book_size_scale = 0;
11653         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11654         return;
11655 }
11656
11657 static void
11658 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11659     uint32_t seq,
11660     uint16_t adding)
11661 {
11662         uint16_t len, old_len;
11663         struct sctp_chunkhdr *ch;
11664         struct sctp_stream_reset_add_strm *addstr;
11665
11666         ch = mtod(chk->data, struct sctp_chunkhdr *);
11667         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11668
11669         /* get to new offset for the param. */
11670         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11671         /* now how long will this param be? */
11672         len = sizeof(struct sctp_stream_reset_add_strm);
11673         /* Fill it out. */
11674         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11675         addstr->ph.param_length = htons(len);
11676         addstr->request_seq = htonl(seq);
11677         addstr->number_of_streams = htons(adding);
11678         addstr->reserved = 0;
11679
11680         /* now fix the chunk length */
11681         ch->chunk_length = htons(len + old_len);
11682         chk->send_size = len + old_len;
11683         chk->book_size = SCTP_SIZE32(chk->send_size);
11684         chk->book_size_scale = 0;
11685         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11686         return;
11687 }
11688
11689 int
11690 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11691     int number_entries, uint16_t * list,
11692     uint8_t send_out_req,
11693     uint8_t send_in_req,
11694     uint8_t send_tsn_req,
11695     uint8_t add_stream,
11696     uint16_t adding_o,
11697     uint16_t adding_i, uint8_t peer_asked)
11698 {
11699
11700         struct sctp_association *asoc;
11701         struct sctp_tmit_chunk *chk;
11702         struct sctp_chunkhdr *ch;
11703         uint32_t seq;
11704
11705         asoc = &stcb->asoc;
11706         if (asoc->stream_reset_outstanding) {
11707                 /*-
11708                  * Already one pending, must get ACK back to clear the flag.
11709                  */
11710                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11711                 return (EBUSY);
11712         }
11713         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11714             (add_stream == 0)) {
11715                 /* nothing to do */
11716                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11717                 return (EINVAL);
11718         }
11719         if (send_tsn_req && (send_out_req || send_in_req)) {
11720                 /* error, can't do that */
11721                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11722                 return (EINVAL);
11723         }
11724         sctp_alloc_a_chunk(stcb, chk);
11725         if (chk == NULL) {
11726                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11727                 return (ENOMEM);
11728         }
11729         chk->copy_by_ref = 0;
11730         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11731         chk->rec.chunk_id.can_take_data = 0;
11732         chk->asoc = &stcb->asoc;
11733         chk->book_size = sizeof(struct sctp_chunkhdr);
11734         chk->send_size = SCTP_SIZE32(chk->book_size);
11735         chk->book_size_scale = 0;
11736
11737         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11738         if (chk->data == NULL) {
11739                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11740                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11741                 return (ENOMEM);
11742         }
11743         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11744
11745         /* setup chunk parameters */
11746         chk->sent = SCTP_DATAGRAM_UNSENT;
11747         chk->snd_count = 0;
11748         if (stcb->asoc.alternate) {
11749                 chk->whoTo = stcb->asoc.alternate;
11750         } else {
11751                 chk->whoTo = stcb->asoc.primary_destination;
11752         }
11753         atomic_add_int(&chk->whoTo->ref_count, 1);
11754         ch = mtod(chk->data, struct sctp_chunkhdr *);
11755         ch->chunk_type = SCTP_STREAM_RESET;
11756         ch->chunk_flags = 0;
11757         ch->chunk_length = htons(chk->book_size);
11758         SCTP_BUF_LEN(chk->data) = chk->send_size;
11759
11760         seq = stcb->asoc.str_reset_seq_out;
11761         if (send_out_req) {
11762                 sctp_add_stream_reset_out(chk, number_entries, list,
11763                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11764                 asoc->stream_reset_out_is_outstanding = 1;
11765                 seq++;
11766                 asoc->stream_reset_outstanding++;
11767         }
11768         if ((add_stream & 1) &&
11769             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11770                 /* Need to allocate more */
11771                 struct sctp_stream_out *oldstream;
11772                 struct sctp_stream_queue_pending *sp, *nsp;
11773                 int i;
11774
11775                 oldstream = stcb->asoc.strmout;
11776                 /* get some more */
11777                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11778                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11779                     SCTP_M_STRMO);
11780                 if (stcb->asoc.strmout == NULL) {
11781                         uint8_t x;
11782
11783                         stcb->asoc.strmout = oldstream;
11784                         /* Turn off the bit */
11785                         x = add_stream & 0xfe;
11786                         add_stream = x;
11787                         goto skip_stuff;
11788                 }
11789                 /*
11790                  * Ok now we proceed with copying the old out stuff and
11791                  * initializing the new stuff.
11792                  */
11793                 SCTP_TCB_SEND_LOCK(stcb);
11794                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11795                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11796                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11797                         stcb->asoc.strmout[i].next_sequence_sent = oldstream[i].next_sequence_sent;
11798                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11799                         stcb->asoc.strmout[i].stream_no = i;
11800                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11801                         /* now anything on those queues? */
11802                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11803                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11804                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11805                         }
11806                         /* Now move assoc pointers too */
11807                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11808                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11809                         }
11810                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11811                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11812                         }
11813                 }
11814                 /* now the new streams */
11815                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11816                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11817                         stcb->asoc.strmout[i].next_sequence_sent = 0x0;
11818                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11819                         stcb->asoc.strmout[i].stream_no = i;
11820                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11821                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11822                 }
11823                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11824                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11825                 SCTP_TCB_SEND_UNLOCK(stcb);
11826         }
11827 skip_stuff:
11828         if ((add_stream & 1) && (adding_o > 0)) {
11829                 asoc->strm_pending_add_size = adding_o;
11830                 asoc->peer_req_out = peer_asked;
11831                 sctp_add_an_out_stream(chk, seq, adding_o);
11832                 seq++;
11833                 asoc->stream_reset_outstanding++;
11834         }
11835         if ((add_stream & 2) && (adding_i > 0)) {
11836                 sctp_add_an_in_stream(chk, seq, adding_i);
11837                 seq++;
11838                 asoc->stream_reset_outstanding++;
11839         }
11840         if (send_in_req) {
11841                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11842                 seq++;
11843                 asoc->stream_reset_outstanding++;
11844         }
11845         if (send_tsn_req) {
11846                 sctp_add_stream_reset_tsn(chk, seq);
11847                 asoc->stream_reset_outstanding++;
11848         }
11849         asoc->str_reset = chk;
11850         /* insert the chunk for sending */
11851         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11852             chk,
11853             sctp_next);
11854         asoc->ctrl_queue_cnt++;
11855         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11856         return (0);
11857 }
11858
11859 void
11860 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11861     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11862     uint8_t use_mflowid, uint32_t mflowid,
11863     uint32_t vrf_id, uint16_t port)
11864 {
11865         /* Don't respond to an ABORT with an ABORT. */
11866         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11867                 if (cause)
11868                         sctp_m_freem(cause);
11869                 return;
11870         }
11871         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11872             use_mflowid, mflowid,
11873             vrf_id, port);
11874         return;
11875 }
11876
11877 void
11878 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11879     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11880     uint8_t use_mflowid, uint32_t mflowid,
11881     uint32_t vrf_id, uint16_t port)
11882 {
11883         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11884             use_mflowid, mflowid,
11885             vrf_id, port);
11886         return;
11887 }
11888
11889 static struct mbuf *
11890 sctp_copy_resume(struct uio *uio,
11891     int max_send_len,
11892     int user_marks_eor,
11893     int *error,
11894     uint32_t * sndout,
11895     struct mbuf **new_tail)
11896 {
11897         struct mbuf *m;
11898
11899         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11900             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11901         if (m == NULL) {
11902                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11903                 *error = ENOMEM;
11904         } else {
11905                 *sndout = m_length(m, NULL);
11906                 *new_tail = m_last(m);
11907         }
11908         return (m);
11909 }
11910
11911 static int
11912 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11913     struct uio *uio,
11914     int resv_upfront)
11915 {
11916         int left;
11917
11918         left = sp->length;
11919         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11920             resv_upfront, 0);
11921         if (sp->data == NULL) {
11922                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11923                 return (ENOMEM);
11924         }
11925         sp->tail_mbuf = m_last(sp->data);
11926         return (0);
11927 }
11928
11929
11930
11931 static struct sctp_stream_queue_pending *
11932 sctp_copy_it_in(struct sctp_tcb *stcb,
11933     struct sctp_association *asoc,
11934     struct sctp_sndrcvinfo *srcv,
11935     struct uio *uio,
11936     struct sctp_nets *net,
11937     int max_send_len,
11938     int user_marks_eor,
11939     int *error)
11940 {
11941         /*-
11942          * This routine must be very careful in its work. Protocol
11943          * processing is up and running so care must be taken to spl...()
11944          * when you need to do something that may effect the stcb/asoc. The
11945          * sb is locked however. When data is copied the protocol processing
11946          * should be enabled since this is a slower operation...
11947          */
11948         struct sctp_stream_queue_pending *sp = NULL;
11949         int resv_in_first;
11950
11951         *error = 0;
11952         /* Now can we send this? */
11953         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11954             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11955             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11956             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11957                 /* got data while shutting down */
11958                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11959                 *error = ECONNRESET;
11960                 goto out_now;
11961         }
11962         sctp_alloc_a_strmoq(stcb, sp);
11963         if (sp == NULL) {
11964                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11965                 *error = ENOMEM;
11966                 goto out_now;
11967         }
11968         sp->act_flags = 0;
11969         sp->sender_all_done = 0;
11970         sp->sinfo_flags = srcv->sinfo_flags;
11971         sp->timetolive = srcv->sinfo_timetolive;
11972         sp->ppid = srcv->sinfo_ppid;
11973         sp->context = srcv->sinfo_context;
11974         sp->strseq = 0;
11975         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11976
11977         sp->stream = srcv->sinfo_stream;
11978         sp->length = min(uio->uio_resid, max_send_len);
11979         if ((sp->length == (uint32_t) uio->uio_resid) &&
11980             ((user_marks_eor == 0) ||
11981             (srcv->sinfo_flags & SCTP_EOF) ||
11982             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
11983                 sp->msg_is_complete = 1;
11984         } else {
11985                 sp->msg_is_complete = 0;
11986         }
11987         sp->sender_all_done = 0;
11988         sp->some_taken = 0;
11989         sp->put_last_out = 0;
11990         resv_in_first = sizeof(struct sctp_data_chunk);
11991         sp->data = sp->tail_mbuf = NULL;
11992         if (sp->length == 0) {
11993                 *error = 0;
11994                 goto skip_copy;
11995         }
11996         if (srcv->sinfo_keynumber_valid) {
11997                 sp->auth_keyid = srcv->sinfo_keynumber;
11998         } else {
11999                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12000         }
12001         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12002                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12003                 sp->holds_key_ref = 1;
12004         }
12005         *error = sctp_copy_one(sp, uio, resv_in_first);
12006 skip_copy:
12007         if (*error) {
12008                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12009                 sp = NULL;
12010         } else {
12011                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12012                         sp->net = net;
12013                         atomic_add_int(&sp->net->ref_count, 1);
12014                 } else {
12015                         sp->net = NULL;
12016                 }
12017                 sctp_set_prsctp_policy(sp);
12018         }
12019 out_now:
12020         return (sp);
12021 }
12022
12023
12024 int
12025 sctp_sosend(struct socket *so,
12026     struct sockaddr *addr,
12027     struct uio *uio,
12028     struct mbuf *top,
12029     struct mbuf *control,
12030     int flags,
12031     struct thread *p
12032 )
12033 {
12034         int error, use_sndinfo = 0;
12035         struct sctp_sndrcvinfo sndrcvninfo;
12036         struct sockaddr *addr_to_use;
12037
12038 #if defined(INET) && defined(INET6)
12039         struct sockaddr_in sin;
12040
12041 #endif
12042
12043         if (control) {
12044                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12045                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12046                     sizeof(sndrcvninfo))) {
12047                         /* got one */
12048                         use_sndinfo = 1;
12049                 }
12050         }
12051         addr_to_use = addr;
12052 #if defined(INET) && defined(INET6)
12053         if ((addr) && (addr->sa_family == AF_INET6)) {
12054                 struct sockaddr_in6 *sin6;
12055
12056                 sin6 = (struct sockaddr_in6 *)addr;
12057                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12058                         in6_sin6_2_sin(&sin, sin6);
12059                         addr_to_use = (struct sockaddr *)&sin;
12060                 }
12061         }
12062 #endif
12063         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12064             control,
12065             flags,
12066             use_sndinfo ? &sndrcvninfo : NULL
12067             ,p
12068             );
12069         return (error);
12070 }
12071
12072
12073 int
12074 sctp_lower_sosend(struct socket *so,
12075     struct sockaddr *addr,
12076     struct uio *uio,
12077     struct mbuf *i_pak,
12078     struct mbuf *control,
12079     int flags,
12080     struct sctp_sndrcvinfo *srcv
12081     ,
12082     struct thread *p
12083 )
12084 {
12085         unsigned int sndlen = 0, max_len;
12086         int error, len;
12087         struct mbuf *top = NULL;
12088         int queue_only = 0, queue_only_for_init = 0;
12089         int free_cnt_applied = 0;
12090         int un_sent;
12091         int now_filled = 0;
12092         unsigned int inqueue_bytes = 0;
12093         struct sctp_block_entry be;
12094         struct sctp_inpcb *inp;
12095         struct sctp_tcb *stcb = NULL;
12096         struct timeval now;
12097         struct sctp_nets *net;
12098         struct sctp_association *asoc;
12099         struct sctp_inpcb *t_inp;
12100         int user_marks_eor;
12101         int create_lock_applied = 0;
12102         int nagle_applies = 0;
12103         int some_on_control = 0;
12104         int got_all_of_the_send = 0;
12105         int hold_tcblock = 0;
12106         int non_blocking = 0;
12107         uint32_t local_add_more, local_soresv = 0;
12108         uint16_t port;
12109         uint16_t sinfo_flags;
12110         sctp_assoc_t sinfo_assoc_id;
12111
12112         error = 0;
12113         net = NULL;
12114         stcb = NULL;
12115         asoc = NULL;
12116
12117         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12118         if (inp == NULL) {
12119                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12120                 error = EINVAL;
12121                 if (i_pak) {
12122                         SCTP_RELEASE_PKT(i_pak);
12123                 }
12124                 return (error);
12125         }
12126         if ((uio == NULL) && (i_pak == NULL)) {
12127                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12128                 return (EINVAL);
12129         }
12130         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12131         atomic_add_int(&inp->total_sends, 1);
12132         if (uio) {
12133                 if (uio->uio_resid < 0) {
12134                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12135                         return (EINVAL);
12136                 }
12137                 sndlen = uio->uio_resid;
12138         } else {
12139                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12140                 sndlen = SCTP_HEADER_LEN(i_pak);
12141         }
12142         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12143             (void *)addr,
12144             sndlen);
12145         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12146             (inp->sctp_socket->so_qlimit)) {
12147                 /* The listener can NOT send */
12148                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12149                 error = ENOTCONN;
12150                 goto out_unlocked;
12151         }
12152         /**
12153          * Pre-screen address, if one is given the sin-len
12154          * must be set correctly!
12155          */
12156         if (addr) {
12157                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12158
12159                 switch (raddr->sa.sa_family) {
12160 #ifdef INET
12161                 case AF_INET:
12162                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12163                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12164                                 error = EINVAL;
12165                                 goto out_unlocked;
12166                         }
12167                         port = raddr->sin.sin_port;
12168                         break;
12169 #endif
12170 #ifdef INET6
12171                 case AF_INET6:
12172                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12173                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12174                                 error = EINVAL;
12175                                 goto out_unlocked;
12176                         }
12177                         port = raddr->sin6.sin6_port;
12178                         break;
12179 #endif
12180                 default:
12181                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12182                         error = EAFNOSUPPORT;
12183                         goto out_unlocked;
12184                 }
12185         } else
12186                 port = 0;
12187
12188         if (srcv) {
12189                 sinfo_flags = srcv->sinfo_flags;
12190                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12191                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12192                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12193                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12194                         error = EINVAL;
12195                         goto out_unlocked;
12196                 }
12197                 if (srcv->sinfo_flags)
12198                         SCTP_STAT_INCR(sctps_sends_with_flags);
12199         } else {
12200                 sinfo_flags = inp->def_send.sinfo_flags;
12201                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12202         }
12203         if (sinfo_flags & SCTP_SENDALL) {
12204                 /* its a sendall */
12205                 error = sctp_sendall(inp, uio, top, srcv);
12206                 top = NULL;
12207                 goto out_unlocked;
12208         }
12209         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12210                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12211                 error = EINVAL;
12212                 goto out_unlocked;
12213         }
12214         /* now we must find the assoc */
12215         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12216             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12217                 SCTP_INP_RLOCK(inp);
12218                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12219                 if (stcb) {
12220                         SCTP_TCB_LOCK(stcb);
12221                         hold_tcblock = 1;
12222                 }
12223                 SCTP_INP_RUNLOCK(inp);
12224         } else if (sinfo_assoc_id) {
12225                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12226         } else if (addr) {
12227                 /*-
12228                  * Since we did not use findep we must
12229                  * increment it, and if we don't find a tcb
12230                  * decrement it.
12231                  */
12232                 SCTP_INP_WLOCK(inp);
12233                 SCTP_INP_INCR_REF(inp);
12234                 SCTP_INP_WUNLOCK(inp);
12235                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12236                 if (stcb == NULL) {
12237                         SCTP_INP_WLOCK(inp);
12238                         SCTP_INP_DECR_REF(inp);
12239                         SCTP_INP_WUNLOCK(inp);
12240                 } else {
12241                         hold_tcblock = 1;
12242                 }
12243         }
12244         if ((stcb == NULL) && (addr)) {
12245                 /* Possible implicit send? */
12246                 SCTP_ASOC_CREATE_LOCK(inp);
12247                 create_lock_applied = 1;
12248                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12249                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12250                         /* Should I really unlock ? */
12251                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12252                         error = EINVAL;
12253                         goto out_unlocked;
12254
12255                 }
12256                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12257                     (addr->sa_family == AF_INET6)) {
12258                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12259                         error = EINVAL;
12260                         goto out_unlocked;
12261                 }
12262                 SCTP_INP_WLOCK(inp);
12263                 SCTP_INP_INCR_REF(inp);
12264                 SCTP_INP_WUNLOCK(inp);
12265                 /* With the lock applied look again */
12266                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12267                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12268                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12269                 }
12270                 if (stcb == NULL) {
12271                         SCTP_INP_WLOCK(inp);
12272                         SCTP_INP_DECR_REF(inp);
12273                         SCTP_INP_WUNLOCK(inp);
12274                 } else {
12275                         hold_tcblock = 1;
12276                 }
12277                 if (error) {
12278                         goto out_unlocked;
12279                 }
12280                 if (t_inp != inp) {
12281                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12282                         error = ENOTCONN;
12283                         goto out_unlocked;
12284                 }
12285         }
12286         if (stcb == NULL) {
12287                 if (addr == NULL) {
12288                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12289                         error = ENOENT;
12290                         goto out_unlocked;
12291                 } else {
12292                         /* We must go ahead and start the INIT process */
12293                         uint32_t vrf_id;
12294
12295                         if ((sinfo_flags & SCTP_ABORT) ||
12296                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12297                                 /*-
12298                                  * User asks to abort a non-existant assoc,
12299                                  * or EOF a non-existant assoc with no data
12300                                  */
12301                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12302                                 error = ENOENT;
12303                                 goto out_unlocked;
12304                         }
12305                         /* get an asoc/stcb struct */
12306                         vrf_id = inp->def_vrf_id;
12307 #ifdef INVARIANTS
12308                         if (create_lock_applied == 0) {
12309                                 panic("Error, should hold create lock and I don't?");
12310                         }
12311 #endif
12312                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12313                             p
12314                             );
12315                         if (stcb == NULL) {
12316                                 /* Error is setup for us in the call */
12317                                 goto out_unlocked;
12318                         }
12319                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12320                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12321                                 /*
12322                                  * Set the connected flag so we can queue
12323                                  * data
12324                                  */
12325                                 soisconnecting(so);
12326                         }
12327                         hold_tcblock = 1;
12328                         if (create_lock_applied) {
12329                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12330                                 create_lock_applied = 0;
12331                         } else {
12332                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12333                         }
12334                         /*
12335                          * Turn on queue only flag to prevent data from
12336                          * being sent
12337                          */
12338                         queue_only = 1;
12339                         asoc = &stcb->asoc;
12340                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12341                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12342
12343                         /* initialize authentication params for the assoc */
12344                         sctp_initialize_auth_params(inp, stcb);
12345
12346                         if (control) {
12347                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12348                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12349                                         hold_tcblock = 0;
12350                                         stcb = NULL;
12351                                         goto out_unlocked;
12352                                 }
12353                         }
12354                         /* out with the INIT */
12355                         queue_only_for_init = 1;
12356                         /*-
12357                          * we may want to dig in after this call and adjust the MTU
12358                          * value. It defaulted to 1500 (constant) but the ro
12359                          * structure may now have an update and thus we may need to
12360                          * change it BEFORE we append the message.
12361                          */
12362                 }
12363         } else
12364                 asoc = &stcb->asoc;
12365         if (srcv == NULL)
12366                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12367         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12368                 if (addr)
12369                         net = sctp_findnet(stcb, addr);
12370                 else
12371                         net = NULL;
12372                 if ((net == NULL) ||
12373                     ((port != 0) && (port != stcb->rport))) {
12374                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12375                         error = EINVAL;
12376                         goto out_unlocked;
12377                 }
12378         } else {
12379                 if (stcb->asoc.alternate) {
12380                         net = stcb->asoc.alternate;
12381                 } else {
12382                         net = stcb->asoc.primary_destination;
12383                 }
12384         }
12385         atomic_add_int(&stcb->total_sends, 1);
12386         /* Keep the stcb from being freed under our feet */
12387         atomic_add_int(&asoc->refcnt, 1);
12388         free_cnt_applied = 1;
12389
12390         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12391                 if (sndlen > asoc->smallest_mtu) {
12392                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12393                         error = EMSGSIZE;
12394                         goto out_unlocked;
12395                 }
12396         }
12397         if (SCTP_SO_IS_NBIO(so)
12398             || (flags & MSG_NBIO)
12399             ) {
12400                 non_blocking = 1;
12401         }
12402         /* would we block? */
12403         if (non_blocking) {
12404                 if (hold_tcblock == 0) {
12405                         SCTP_TCB_LOCK(stcb);
12406                         hold_tcblock = 1;
12407                 }
12408                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12409                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12410                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12411                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12412                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12413                                 error = EMSGSIZE;
12414                         else
12415                                 error = EWOULDBLOCK;
12416                         goto out_unlocked;
12417                 }
12418                 stcb->asoc.sb_send_resv += sndlen;
12419                 SCTP_TCB_UNLOCK(stcb);
12420                 hold_tcblock = 0;
12421         } else {
12422                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12423         }
12424         local_soresv = sndlen;
12425         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12426                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12427                 error = ECONNRESET;
12428                 goto out_unlocked;
12429         }
12430         if (create_lock_applied) {
12431                 SCTP_ASOC_CREATE_UNLOCK(inp);
12432                 create_lock_applied = 0;
12433         }
12434         if (asoc->stream_reset_outstanding) {
12435                 /*
12436                  * Can't queue any data while stream reset is underway.
12437                  */
12438                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12439                 error = EAGAIN;
12440                 goto out_unlocked;
12441         }
12442         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12443             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12444                 queue_only = 1;
12445         }
12446         /* we are now done with all control */
12447         if (control) {
12448                 sctp_m_freem(control);
12449                 control = NULL;
12450         }
12451         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12452             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12453             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12454             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12455                 if (srcv->sinfo_flags & SCTP_ABORT) {
12456                         ;
12457                 } else {
12458                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12459                         error = ECONNRESET;
12460                         goto out_unlocked;
12461                 }
12462         }
12463         /* Ok, we will attempt a msgsnd :> */
12464         if (p) {
12465                 p->td_ru.ru_msgsnd++;
12466         }
12467         /* Are we aborting? */
12468         if (srcv->sinfo_flags & SCTP_ABORT) {
12469                 struct mbuf *mm;
12470                 int tot_demand, tot_out = 0, max_out;
12471
12472                 SCTP_STAT_INCR(sctps_sends_with_abort);
12473                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12474                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12475                         /* It has to be up before we abort */
12476                         /* how big is the user initiated abort? */
12477                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12478                         error = EINVAL;
12479                         goto out;
12480                 }
12481                 if (hold_tcblock) {
12482                         SCTP_TCB_UNLOCK(stcb);
12483                         hold_tcblock = 0;
12484                 }
12485                 if (top) {
12486                         struct mbuf *cntm = NULL;
12487
12488                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12489                         if (sndlen != 0) {
12490                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12491                                         tot_out += SCTP_BUF_LEN(cntm);
12492                                 }
12493                         }
12494                 } else {
12495                         /* Must fit in a MTU */
12496                         tot_out = sndlen;
12497                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12498                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12499                                 /* To big */
12500                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12501                                 error = EMSGSIZE;
12502                                 goto out;
12503                         }
12504                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12505                 }
12506                 if (mm == NULL) {
12507                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12508                         error = ENOMEM;
12509                         goto out;
12510                 }
12511                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12512                 max_out -= sizeof(struct sctp_abort_msg);
12513                 if (tot_out > max_out) {
12514                         tot_out = max_out;
12515                 }
12516                 if (mm) {
12517                         struct sctp_paramhdr *ph;
12518
12519                         /* now move forward the data pointer */
12520                         ph = mtod(mm, struct sctp_paramhdr *);
12521                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12522                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12523                         ph++;
12524                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12525                         if (top == NULL) {
12526                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12527                                 if (error) {
12528                                         /*-
12529                                          * Here if we can't get his data we
12530                                          * still abort we just don't get to
12531                                          * send the users note :-0
12532                                          */
12533                                         sctp_m_freem(mm);
12534                                         mm = NULL;
12535                                 }
12536                         } else {
12537                                 if (sndlen != 0) {
12538                                         SCTP_BUF_NEXT(mm) = top;
12539                                 }
12540                         }
12541                 }
12542                 if (hold_tcblock == 0) {
12543                         SCTP_TCB_LOCK(stcb);
12544                 }
12545                 atomic_add_int(&stcb->asoc.refcnt, -1);
12546                 free_cnt_applied = 0;
12547                 /* release this lock, otherwise we hang on ourselves */
12548                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12549                 /* now relock the stcb so everything is sane */
12550                 hold_tcblock = 0;
12551                 stcb = NULL;
12552                 /*
12553                  * In this case top is already chained to mm avoid double
12554                  * free, since we free it below if top != NULL and driver
12555                  * would free it after sending the packet out
12556                  */
12557                 if (sndlen != 0) {
12558                         top = NULL;
12559                 }
12560                 goto out_unlocked;
12561         }
12562         /* Calculate the maximum we can send */
12563         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12564         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12565                 if (non_blocking) {
12566                         /* we already checked for non-blocking above. */
12567                         max_len = sndlen;
12568                 } else {
12569                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12570                 }
12571         } else {
12572                 max_len = 0;
12573         }
12574         if (hold_tcblock) {
12575                 SCTP_TCB_UNLOCK(stcb);
12576                 hold_tcblock = 0;
12577         }
12578         /* Is the stream no. valid? */
12579         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12580                 /* Invalid stream number */
12581                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12582                 error = EINVAL;
12583                 goto out_unlocked;
12584         }
12585         if (asoc->strmout == NULL) {
12586                 /* huh? software error */
12587                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12588                 error = EFAULT;
12589                 goto out_unlocked;
12590         }
12591         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12592         if ((user_marks_eor == 0) &&
12593             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12594                 /* It will NEVER fit */
12595                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12596                 error = EMSGSIZE;
12597                 goto out_unlocked;
12598         }
12599         if ((uio == NULL) && user_marks_eor) {
12600                 /*-
12601                  * We do not support eeor mode for
12602                  * sending with mbuf chains (like sendfile).
12603                  */
12604                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12605                 error = EINVAL;
12606                 goto out_unlocked;
12607         }
12608         if (user_marks_eor) {
12609                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12610         } else {
12611                 /*-
12612                  * For non-eeor the whole message must fit in
12613                  * the socket send buffer.
12614                  */
12615                 local_add_more = sndlen;
12616         }
12617         len = 0;
12618         if (non_blocking) {
12619                 goto skip_preblock;
12620         }
12621         if (((max_len <= local_add_more) &&
12622             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12623             (max_len == 0) ||
12624             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12625                 /* No room right now ! */
12626                 SOCKBUF_LOCK(&so->so_snd);
12627                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12628                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12629                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12630                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12631                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12632                             inqueue_bytes,
12633                             local_add_more,
12634                             stcb->asoc.stream_queue_cnt,
12635                             stcb->asoc.chunks_on_out_queue,
12636                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12637                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12638                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12639                         }
12640                         be.error = 0;
12641                         stcb->block_entry = &be;
12642                         error = sbwait(&so->so_snd);
12643                         stcb->block_entry = NULL;
12644                         if (error || so->so_error || be.error) {
12645                                 if (error == 0) {
12646                                         if (so->so_error)
12647                                                 error = so->so_error;
12648                                         if (be.error) {
12649                                                 error = be.error;
12650                                         }
12651                                 }
12652                                 SOCKBUF_UNLOCK(&so->so_snd);
12653                                 goto out_unlocked;
12654                         }
12655                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12656                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12657                                     asoc, stcb->asoc.total_output_queue_size);
12658                         }
12659                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12660                                 goto out_unlocked;
12661                         }
12662                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12663                 }
12664                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12665                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12666                 } else {
12667                         max_len = 0;
12668                 }
12669                 SOCKBUF_UNLOCK(&so->so_snd);
12670         }
12671 skip_preblock:
12672         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12673                 goto out_unlocked;
12674         }
12675         /*
12676          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12677          * case NOTE: uio will be null when top/mbuf is passed
12678          */
12679         if (sndlen == 0) {
12680                 if (srcv->sinfo_flags & SCTP_EOF) {
12681                         got_all_of_the_send = 1;
12682                         goto dataless_eof;
12683                 } else {
12684                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12685                         error = EINVAL;
12686                         goto out;
12687                 }
12688         }
12689         if (top == NULL) {
12690                 struct sctp_stream_queue_pending *sp;
12691                 struct sctp_stream_out *strm;
12692                 uint32_t sndout;
12693
12694                 SCTP_TCB_SEND_LOCK(stcb);
12695                 if ((asoc->stream_locked) &&
12696                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12697                         SCTP_TCB_SEND_UNLOCK(stcb);
12698                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12699                         error = EINVAL;
12700                         goto out;
12701                 }
12702                 SCTP_TCB_SEND_UNLOCK(stcb);
12703
12704                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12705                 if (strm->last_msg_incomplete == 0) {
12706         do_a_copy_in:
12707                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12708                         if ((sp == NULL) || (error)) {
12709                                 goto out;
12710                         }
12711                         SCTP_TCB_SEND_LOCK(stcb);
12712                         if (sp->msg_is_complete) {
12713                                 strm->last_msg_incomplete = 0;
12714                                 asoc->stream_locked = 0;
12715                         } else {
12716                                 /*
12717                                  * Just got locked to this guy in case of an
12718                                  * interrupt.
12719                                  */
12720                                 strm->last_msg_incomplete = 1;
12721                                 asoc->stream_locked = 1;
12722                                 asoc->stream_locked_on = srcv->sinfo_stream;
12723                                 sp->sender_all_done = 0;
12724                         }
12725                         sctp_snd_sb_alloc(stcb, sp->length);
12726                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12727                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12728                                 sp->strseq = strm->next_sequence_sent;
12729                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12730                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12731                                             (uintptr_t) stcb, sp->length,
12732                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12733                                 }
12734                                 strm->next_sequence_sent++;
12735                         } else {
12736                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12737                         }
12738                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12739                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12740                         SCTP_TCB_SEND_UNLOCK(stcb);
12741                 } else {
12742                         SCTP_TCB_SEND_LOCK(stcb);
12743                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12744                         SCTP_TCB_SEND_UNLOCK(stcb);
12745                         if (sp == NULL) {
12746                                 /* ???? Huh ??? last msg is gone */
12747 #ifdef INVARIANTS
12748                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12749 #else
12750                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12751                                 strm->last_msg_incomplete = 0;
12752 #endif
12753                                 goto do_a_copy_in;
12754
12755                         }
12756                 }
12757                 while (uio->uio_resid > 0) {
12758                         /* How much room do we have? */
12759                         struct mbuf *new_tail, *mm;
12760
12761                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12762                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12763                         else
12764                                 max_len = 0;
12765
12766                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12767                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12768                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12769                                 sndout = 0;
12770                                 new_tail = NULL;
12771                                 if (hold_tcblock) {
12772                                         SCTP_TCB_UNLOCK(stcb);
12773                                         hold_tcblock = 0;
12774                                 }
12775                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12776                                 if ((mm == NULL) || error) {
12777                                         if (mm) {
12778                                                 sctp_m_freem(mm);
12779                                         }
12780                                         goto out;
12781                                 }
12782                                 /* Update the mbuf and count */
12783                                 SCTP_TCB_SEND_LOCK(stcb);
12784                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12785                                         /*
12786                                          * we need to get out. Peer probably
12787                                          * aborted.
12788                                          */
12789                                         sctp_m_freem(mm);
12790                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12791                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12792                                                 error = ECONNRESET;
12793                                         }
12794                                         SCTP_TCB_SEND_UNLOCK(stcb);
12795                                         goto out;
12796                                 }
12797                                 if (sp->tail_mbuf) {
12798                                         /* tack it to the end */
12799                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12800                                         sp->tail_mbuf = new_tail;
12801                                 } else {
12802                                         /* A stolen mbuf */
12803                                         sp->data = mm;
12804                                         sp->tail_mbuf = new_tail;
12805                                 }
12806                                 sctp_snd_sb_alloc(stcb, sndout);
12807                                 atomic_add_int(&sp->length, sndout);
12808                                 len += sndout;
12809
12810                                 /* Did we reach EOR? */
12811                                 if ((uio->uio_resid == 0) &&
12812                                     ((user_marks_eor == 0) ||
12813                                     (srcv->sinfo_flags & SCTP_EOF) ||
12814                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12815                                         sp->msg_is_complete = 1;
12816                                 } else {
12817                                         sp->msg_is_complete = 0;
12818                                 }
12819                                 SCTP_TCB_SEND_UNLOCK(stcb);
12820                         }
12821                         if (uio->uio_resid == 0) {
12822                                 /* got it all? */
12823                                 continue;
12824                         }
12825                         /* PR-SCTP? */
12826                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12827                                 /*
12828                                  * This is ugly but we must assure locking
12829                                  * order
12830                                  */
12831                                 if (hold_tcblock == 0) {
12832                                         SCTP_TCB_LOCK(stcb);
12833                                         hold_tcblock = 1;
12834                                 }
12835                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12836                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12837                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12838                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12839                                 else
12840                                         max_len = 0;
12841                                 if (max_len > 0) {
12842                                         continue;
12843                                 }
12844                                 SCTP_TCB_UNLOCK(stcb);
12845                                 hold_tcblock = 0;
12846                         }
12847                         /* wait for space now */
12848                         if (non_blocking) {
12849                                 /* Non-blocking io in place out */
12850                                 goto skip_out_eof;
12851                         }
12852                         /* What about the INIT, send it maybe */
12853                         if (queue_only_for_init) {
12854                                 if (hold_tcblock == 0) {
12855                                         SCTP_TCB_LOCK(stcb);
12856                                         hold_tcblock = 1;
12857                                 }
12858                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12859                                         /* a collision took us forward? */
12860                                         queue_only = 0;
12861                                 } else {
12862                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12863                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12864                                         queue_only = 1;
12865                                 }
12866                         }
12867                         if ((net->flight_size > net->cwnd) &&
12868                             (asoc->sctp_cmt_on_off == 0)) {
12869                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12870                                 queue_only = 1;
12871                         } else if (asoc->ifp_had_enobuf) {
12872                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12873                                 if (net->flight_size > (2 * net->mtu)) {
12874                                         queue_only = 1;
12875                                 }
12876                                 asoc->ifp_had_enobuf = 0;
12877                         }
12878                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12879                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12880                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12881                             (stcb->asoc.total_flight > 0) &&
12882                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12883                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12884
12885                                 /*-
12886                                  * Ok, Nagle is set on and we have data outstanding.
12887                                  * Don't send anything and let SACKs drive out the
12888                                  * data unless wen have a "full" segment to send.
12889                                  */
12890                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12891                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12892                                 }
12893                                 SCTP_STAT_INCR(sctps_naglequeued);
12894                                 nagle_applies = 1;
12895                         } else {
12896                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12897                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12898                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12899                                 }
12900                                 SCTP_STAT_INCR(sctps_naglesent);
12901                                 nagle_applies = 0;
12902                         }
12903                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12904
12905                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12906                                     nagle_applies, un_sent);
12907                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12908                                     stcb->asoc.total_flight,
12909                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12910                         }
12911                         if (queue_only_for_init)
12912                                 queue_only_for_init = 0;
12913                         if ((queue_only == 0) && (nagle_applies == 0)) {
12914                                 /*-
12915                                  * need to start chunk output
12916                                  * before blocking.. note that if
12917                                  * a lock is already applied, then
12918                                  * the input via the net is happening
12919                                  * and I don't need to start output :-D
12920                                  */
12921                                 if (hold_tcblock == 0) {
12922                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12923                                                 hold_tcblock = 1;
12924                                                 sctp_chunk_output(inp,
12925                                                     stcb,
12926                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12927                                         }
12928                                 } else {
12929                                         sctp_chunk_output(inp,
12930                                             stcb,
12931                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12932                                 }
12933                                 if (hold_tcblock == 1) {
12934                                         SCTP_TCB_UNLOCK(stcb);
12935                                         hold_tcblock = 0;
12936                                 }
12937                         }
12938                         SOCKBUF_LOCK(&so->so_snd);
12939                         /*-
12940                          * This is a bit strange, but I think it will
12941                          * work. The total_output_queue_size is locked and
12942                          * protected by the TCB_LOCK, which we just released.
12943                          * There is a race that can occur between releasing it
12944                          * above, and me getting the socket lock, where sacks
12945                          * come in but we have not put the SB_WAIT on the
12946                          * so_snd buffer to get the wakeup. After the LOCK
12947                          * is applied the sack_processing will also need to
12948                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12949                          * once we have the socket buffer lock if we recheck the
12950                          * size we KNOW we will get to sleep safely with the
12951                          * wakeup flag in place.
12952                          */
12953                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12954                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
12955                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12956                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12957                                             asoc, uio->uio_resid);
12958                                 }
12959                                 be.error = 0;
12960                                 stcb->block_entry = &be;
12961                                 error = sbwait(&so->so_snd);
12962                                 stcb->block_entry = NULL;
12963
12964                                 if (error || so->so_error || be.error) {
12965                                         if (error == 0) {
12966                                                 if (so->so_error)
12967                                                         error = so->so_error;
12968                                                 if (be.error) {
12969                                                         error = be.error;
12970                                                 }
12971                                         }
12972                                         SOCKBUF_UNLOCK(&so->so_snd);
12973                                         goto out_unlocked;
12974                                 }
12975                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12976                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12977                                             asoc, stcb->asoc.total_output_queue_size);
12978                                 }
12979                         }
12980                         SOCKBUF_UNLOCK(&so->so_snd);
12981                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12982                                 goto out_unlocked;
12983                         }
12984                 }
12985                 SCTP_TCB_SEND_LOCK(stcb);
12986                 if (sp) {
12987                         if (sp->msg_is_complete == 0) {
12988                                 strm->last_msg_incomplete = 1;
12989                                 asoc->stream_locked = 1;
12990                                 asoc->stream_locked_on = srcv->sinfo_stream;
12991                         } else {
12992                                 sp->sender_all_done = 1;
12993                                 strm->last_msg_incomplete = 0;
12994                                 asoc->stream_locked = 0;
12995                         }
12996                 } else {
12997                         SCTP_PRINTF("Huh no sp TSNH?\n");
12998                         strm->last_msg_incomplete = 0;
12999                         asoc->stream_locked = 0;
13000                 }
13001                 SCTP_TCB_SEND_UNLOCK(stcb);
13002                 if (uio->uio_resid == 0) {
13003                         got_all_of_the_send = 1;
13004                 }
13005         } else {
13006                 /* We send in a 0, since we do NOT have any locks */
13007                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13008                 top = NULL;
13009                 if (srcv->sinfo_flags & SCTP_EOF) {
13010                         /*
13011                          * This should only happen for Panda for the mbuf
13012                          * send case, which does NOT yet support EEOR mode.
13013                          * Thus, we can just set this flag to do the proper
13014                          * EOF handling.
13015                          */
13016                         got_all_of_the_send = 1;
13017                 }
13018         }
13019         if (error) {
13020                 goto out;
13021         }
13022 dataless_eof:
13023         /* EOF thing ? */
13024         if ((srcv->sinfo_flags & SCTP_EOF) &&
13025             (got_all_of_the_send == 1)) {
13026                 int cnt;
13027
13028                 SCTP_STAT_INCR(sctps_sends_with_eof);
13029                 error = 0;
13030                 if (hold_tcblock == 0) {
13031                         SCTP_TCB_LOCK(stcb);
13032                         hold_tcblock = 1;
13033                 }
13034                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13035                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13036                     TAILQ_EMPTY(&asoc->sent_queue) &&
13037                     (cnt == 0)) {
13038                         if (asoc->locked_on_sending) {
13039                                 goto abort_anyway;
13040                         }
13041                         /* there is nothing queued to send, so I'm done... */
13042                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13043                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13044                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13045                                 struct sctp_nets *netp;
13046
13047                                 if (stcb->asoc.alternate) {
13048                                         netp = stcb->asoc.alternate;
13049                                 } else {
13050                                         netp = stcb->asoc.primary_destination;
13051                                 }
13052                                 /* only send SHUTDOWN the first time through */
13053                                 sctp_send_shutdown(stcb, netp);
13054                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13055                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13056                                 }
13057                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13058                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13059                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13060                                     netp);
13061                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13062                                     asoc->primary_destination);
13063                         }
13064                 } else {
13065                         /*-
13066                          * we still got (or just got) data to send, so set
13067                          * SHUTDOWN_PENDING
13068                          */
13069                         /*-
13070                          * XXX sockets draft says that SCTP_EOF should be
13071                          * sent with no data.  currently, we will allow user
13072                          * data to be sent first and move to
13073                          * SHUTDOWN-PENDING
13074                          */
13075                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13076                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13077                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13078                                 if (hold_tcblock == 0) {
13079                                         SCTP_TCB_LOCK(stcb);
13080                                         hold_tcblock = 1;
13081                                 }
13082                                 if (asoc->locked_on_sending) {
13083                                         /* Locked to send out the data */
13084                                         struct sctp_stream_queue_pending *sp;
13085
13086                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13087                                         if (sp) {
13088                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13089                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13090                                         }
13091                                 }
13092                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13093                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13094                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13095                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13096                         abort_anyway:
13097                                         if (free_cnt_applied) {
13098                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13099                                                 free_cnt_applied = 0;
13100                                         }
13101                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13102                                             NULL, SCTP_SO_LOCKED);
13103                                         /*
13104                                          * now relock the stcb so everything
13105                                          * is sane
13106                                          */
13107                                         hold_tcblock = 0;
13108                                         stcb = NULL;
13109                                         goto out;
13110                                 }
13111                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13112                                     asoc->primary_destination);
13113                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13114                         }
13115                 }
13116         }
13117 skip_out_eof:
13118         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13119                 some_on_control = 1;
13120         }
13121         if (queue_only_for_init) {
13122                 if (hold_tcblock == 0) {
13123                         SCTP_TCB_LOCK(stcb);
13124                         hold_tcblock = 1;
13125                 }
13126                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13127                         /* a collision took us forward? */
13128                         queue_only = 0;
13129                 } else {
13130                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13131                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13132                         queue_only = 1;
13133                 }
13134         }
13135         if ((net->flight_size > net->cwnd) &&
13136             (stcb->asoc.sctp_cmt_on_off == 0)) {
13137                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13138                 queue_only = 1;
13139         } else if (asoc->ifp_had_enobuf) {
13140                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13141                 if (net->flight_size > (2 * net->mtu)) {
13142                         queue_only = 1;
13143                 }
13144                 asoc->ifp_had_enobuf = 0;
13145         }
13146         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13147             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13148         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13149             (stcb->asoc.total_flight > 0) &&
13150             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13151             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13152                 /*-
13153                  * Ok, Nagle is set on and we have data outstanding.
13154                  * Don't send anything and let SACKs drive out the
13155                  * data unless wen have a "full" segment to send.
13156                  */
13157                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13158                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13159                 }
13160                 SCTP_STAT_INCR(sctps_naglequeued);
13161                 nagle_applies = 1;
13162         } else {
13163                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13164                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13165                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13166                 }
13167                 SCTP_STAT_INCR(sctps_naglesent);
13168                 nagle_applies = 0;
13169         }
13170         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13171                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13172                     nagle_applies, un_sent);
13173                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13174                     stcb->asoc.total_flight,
13175                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13176         }
13177         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13178                 /* we can attempt to send too. */
13179                 if (hold_tcblock == 0) {
13180                         /*
13181                          * If there is activity recv'ing sacks no need to
13182                          * send
13183                          */
13184                         if (SCTP_TCB_TRYLOCK(stcb)) {
13185                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13186                                 hold_tcblock = 1;
13187                         }
13188                 } else {
13189                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13190                 }
13191         } else if ((queue_only == 0) &&
13192                     (stcb->asoc.peers_rwnd == 0) &&
13193             (stcb->asoc.total_flight == 0)) {
13194                 /* We get to have a probe outstanding */
13195                 if (hold_tcblock == 0) {
13196                         hold_tcblock = 1;
13197                         SCTP_TCB_LOCK(stcb);
13198                 }
13199                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13200         } else if (some_on_control) {
13201                 int num_out, reason, frag_point;
13202
13203                 /* Here we do control only */
13204                 if (hold_tcblock == 0) {
13205                         hold_tcblock = 1;
13206                         SCTP_TCB_LOCK(stcb);
13207                 }
13208                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13209                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13210                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13211         }
13212         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13213             queue_only, stcb->asoc.peers_rwnd, un_sent,
13214             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13215             stcb->asoc.total_output_queue_size, error);
13216
13217 out:
13218 out_unlocked:
13219
13220         if (local_soresv && stcb) {
13221                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13222         }
13223         if (create_lock_applied) {
13224                 SCTP_ASOC_CREATE_UNLOCK(inp);
13225         }
13226         if ((stcb) && hold_tcblock) {
13227                 SCTP_TCB_UNLOCK(stcb);
13228         }
13229         if (stcb && free_cnt_applied) {
13230                 atomic_add_int(&stcb->asoc.refcnt, -1);
13231         }
13232 #ifdef INVARIANTS
13233         if (stcb) {
13234                 if (mtx_owned(&stcb->tcb_mtx)) {
13235                         panic("Leaving with tcb mtx owned?");
13236                 }
13237                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13238                         panic("Leaving with tcb send mtx owned?");
13239                 }
13240         }
13241 #endif
13242 #ifdef INVARIANTS
13243         if (inp) {
13244                 sctp_validate_no_locks(inp);
13245         } else {
13246                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13247         }
13248 #endif
13249         if (top) {
13250                 sctp_m_freem(top);
13251         }
13252         if (control) {
13253                 sctp_m_freem(control);
13254         }
13255         return (error);
13256 }
13257
13258
13259 /*
13260  * generate an AUTHentication chunk, if required
13261  */
13262 struct mbuf *
13263 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13264     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13265     struct sctp_tcb *stcb, uint8_t chunk)
13266 {
13267         struct mbuf *m_auth;
13268         struct sctp_auth_chunk *auth;
13269         int chunk_len;
13270         struct mbuf *cn;
13271
13272         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13273             (stcb == NULL))
13274                 return (m);
13275
13276         /* sysctl disabled auth? */
13277         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13278                 return (m);
13279
13280         /* peer doesn't do auth... */
13281         if (!stcb->asoc.peer_supports_auth) {
13282                 return (m);
13283         }
13284         /* does the requested chunk require auth? */
13285         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13286                 return (m);
13287         }
13288         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13289         if (m_auth == NULL) {
13290                 /* no mbuf's */
13291                 return (m);
13292         }
13293         /* reserve some space if this will be the first mbuf */
13294         if (m == NULL)
13295                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13296         /* fill in the AUTH chunk details */
13297         auth = mtod(m_auth, struct sctp_auth_chunk *);
13298         bzero(auth, sizeof(*auth));
13299         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13300         auth->ch.chunk_flags = 0;
13301         chunk_len = sizeof(*auth) +
13302             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13303         auth->ch.chunk_length = htons(chunk_len);
13304         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13305         /* key id and hmac digest will be computed and filled in upon send */
13306
13307         /* save the offset where the auth was inserted into the chain */
13308         *offset = 0;
13309         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13310                 *offset += SCTP_BUF_LEN(cn);
13311         }
13312
13313         /* update length and return pointer to the auth chunk */
13314         SCTP_BUF_LEN(m_auth) = chunk_len;
13315         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13316         if (auth_ret != NULL)
13317                 *auth_ret = auth;
13318
13319         return (m);
13320 }
13321
13322 #ifdef INET6
13323 int
13324 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13325 {
13326         struct nd_prefix *pfx = NULL;
13327         struct nd_pfxrouter *pfxrtr = NULL;
13328         struct sockaddr_in6 gw6;
13329
13330         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13331                 return (0);
13332
13333         /* get prefix entry of address */
13334         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13335                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13336                         continue;
13337                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13338                     &src6->sin6_addr, &pfx->ndpr_mask))
13339                         break;
13340         }
13341         /* no prefix entry in the prefix list */
13342         if (pfx == NULL) {
13343                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13344                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13345                 return (0);
13346         }
13347         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13348         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13349
13350         /* search installed gateway from prefix entry */
13351         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13352                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13353                 gw6.sin6_family = AF_INET6;
13354                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13355                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13356                     sizeof(struct in6_addr));
13357                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13358                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13359                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13360                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13361                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13362                     ro->ro_rt->rt_gateway)) {
13363                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13364                         return (1);
13365                 }
13366         }
13367         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13368         return (0);
13369 }
13370
13371 #endif
13372
13373 int
13374 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13375 {
13376 #ifdef INET
13377         struct sockaddr_in *sin, *mask;
13378         struct ifaddr *ifa;
13379         struct in_addr srcnetaddr, gwnetaddr;
13380
13381         if (ro == NULL || ro->ro_rt == NULL ||
13382             sifa->address.sa.sa_family != AF_INET) {
13383                 return (0);
13384         }
13385         ifa = (struct ifaddr *)sifa->ifa;
13386         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13387         sin = (struct sockaddr_in *)&sifa->address.sin;
13388         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13389         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13390         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13391         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13392
13393         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13394         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13395         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13396         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13397         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13398         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13399                 return (1);
13400         }
13401 #endif
13402         return (0);
13403 }