sys/netinet/sctp_output.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_var.h>
  39 #include <netinet/sctp_sysctl.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctputil.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_bsd_addr.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_crc32.h>
  53 #include <netinet/udp.h>
  54 #include <netinet/udp_var.h>
  55 #include <machine/in_cksum.h>
  56
  57
  58
  59 #define SCTP_MAX_GAPS_INARRAY 4
  60 struct sack_track {
  61         uint8_t right_edge;     /* mergable on the right edge */
  62         uint8_t left_edge;      /* mergable on the left edge */
  63         uint8_t num_entries;
  64         uint8_t spare;
  65         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
  66 };
  67
  68 struct sack_track sack_array[256] = {
  69         {0, 0, 0, 0,            /* 0x00 */
  70                 {{0, 0},
  71                 {0, 0},
  72                 {0, 0},
  73                 {0, 0}
  74                 }
  75         },
  76         {1, 0, 1, 0,            /* 0x01 */
  77                 {{0, 0},
  78                 {0, 0},
  79                 {0, 0},
  80                 {0, 0}
  81                 }
  82         },
  83         {0, 0, 1, 0,            /* 0x02 */
  84                 {{1, 1},
  85                 {0, 0},
  86                 {0, 0},
  87                 {0, 0}
  88                 }
  89         },
  90         {1, 0, 1, 0,            /* 0x03 */
  91                 {{0, 1},
  92                 {0, 0},
  93                 {0, 0},
  94                 {0, 0}
  95                 }
  96         },
  97         {0, 0, 1, 0,            /* 0x04 */
  98                 {{2, 2},
  99                 {0, 0},
 100                 {0, 0},
 101                 {0, 0}
 102                 }
 103         },
 104         {1, 0, 2, 0,            /* 0x05 */
 105                 {{0, 0},
 106                 {2, 2},
 107                 {0, 0},
 108                 {0, 0}
 109                 }
 110         },
 111         {0, 0, 1, 0,            /* 0x06 */
 112                 {{1, 2},
 113                 {0, 0},
 114                 {0, 0},
 115                 {0, 0}
 116                 }
 117         },
 118         {1, 0, 1, 0,            /* 0x07 */
 119                 {{0, 2},
 120                 {0, 0},
 121                 {0, 0},
 122                 {0, 0}
 123                 }
 124         },
 125         {0, 0, 1, 0,            /* 0x08 */
 126                 {{3, 3},
 127                 {0, 0},
 128                 {0, 0},
 129                 {0, 0}
 130                 }
 131         },
 132         {1, 0, 2, 0,            /* 0x09 */
 133                 {{0, 0},
 134                 {3, 3},
 135                 {0, 0},
 136                 {0, 0}
 137                 }
 138         },
 139         {0, 0, 2, 0,            /* 0x0a */
 140                 {{1, 1},
 141                 {3, 3},
 142                 {0, 0},
 143                 {0, 0}
 144                 }
 145         },
 146         {1, 0, 2, 0,            /* 0x0b */
 147                 {{0, 1},
 148                 {3, 3},
 149                 {0, 0},
 150                 {0, 0}
 151                 }
 152         },
 153         {0, 0, 1, 0,            /* 0x0c */
 154                 {{2, 3},
 155                 {0, 0},
 156                 {0, 0},
 157                 {0, 0}
 158                 }
 159         },
 160         {1, 0, 2, 0,            /* 0x0d */
 161                 {{0, 0},
 162                 {2, 3},
 163                 {0, 0},
 164                 {0, 0}
 165                 }
 166         },
 167         {0, 0, 1, 0,            /* 0x0e */
 168                 {{1, 3},
 169                 {0, 0},
 170                 {0, 0},
 171                 {0, 0}
 172                 }
 173         },
 174         {1, 0, 1, 0,            /* 0x0f */
 175                 {{0, 3},
 176                 {0, 0},
 177                 {0, 0},
 178                 {0, 0}
 179                 }
 180         },
 181         {0, 0, 1, 0,            /* 0x10 */
 182                 {{4, 4},
 183                 {0, 0},
 184                 {0, 0},
 185                 {0, 0}
 186                 }
 187         },
 188         {1, 0, 2, 0,            /* 0x11 */
 189                 {{0, 0},
 190                 {4, 4},
 191                 {0, 0},
 192                 {0, 0}
 193                 }
 194         },
 195         {0, 0, 2, 0,            /* 0x12 */
 196                 {{1, 1},
 197                 {4, 4},
 198                 {0, 0},
 199                 {0, 0}
 200                 }
 201         },
 202         {1, 0, 2, 0,            /* 0x13 */
 203                 {{0, 1},
 204                 {4, 4},
 205                 {0, 0},
 206                 {0, 0}
 207                 }
 208         },
 209         {0, 0, 2, 0,            /* 0x14 */
 210                 {{2, 2},
 211                 {4, 4},
 212                 {0, 0},
 213                 {0, 0}
 214                 }
 215         },
 216         {1, 0, 3, 0,            /* 0x15 */
 217                 {{0, 0},
 218                 {2, 2},
 219                 {4, 4},
 220                 {0, 0}
 221                 }
 222         },
 223         {0, 0, 2, 0,            /* 0x16 */
 224                 {{1, 2},
 225                 {4, 4},
 226                 {0, 0},
 227                 {0, 0}
 228                 }
 229         },
 230         {1, 0, 2, 0,            /* 0x17 */
 231                 {{0, 2},
 232                 {4, 4},
 233                 {0, 0},
 234                 {0, 0}
 235                 }
 236         },
 237         {0, 0, 1, 0,            /* 0x18 */
 238                 {{3, 4},
 239                 {0, 0},
 240                 {0, 0},
 241                 {0, 0}
 242                 }
 243         },
 244         {1, 0, 2, 0,            /* 0x19 */
 245                 {{0, 0},
 246                 {3, 4},
 247                 {0, 0},
 248                 {0, 0}
 249                 }
 250         },
 251         {0, 0, 2, 0,            /* 0x1a */
 252                 {{1, 1},
 253                 {3, 4},
 254                 {0, 0},
 255                 {0, 0}
 256                 }
 257         },
 258         {1, 0, 2, 0,            /* 0x1b */
 259                 {{0, 1},
 260                 {3, 4},
 261                 {0, 0},
 262                 {0, 0}
 263                 }
 264         },
 265         {0, 0, 1, 0,            /* 0x1c */
 266                 {{2, 4},
 267                 {0, 0},
 268                 {0, 0},
 269                 {0, 0}
 270                 }
 271         },
 272         {1, 0, 2, 0,            /* 0x1d */
 273                 {{0, 0},
 274                 {2, 4},
 275                 {0, 0},
 276                 {0, 0}
 277                 }
 278         },
 279         {0, 0, 1, 0,            /* 0x1e */
 280                 {{1, 4},
 281                 {0, 0},
 282                 {0, 0},
 283                 {0, 0}
 284                 }
 285         },
 286         {1, 0, 1, 0,            /* 0x1f */
 287                 {{0, 4},
 288                 {0, 0},
 289                 {0, 0},
 290                 {0, 0}
 291                 }
 292         },
 293         {0, 0, 1, 0,            /* 0x20 */
 294                 {{5, 5},
 295                 {0, 0},
 296                 {0, 0},
 297                 {0, 0}
 298                 }
 299         },
 300         {1, 0, 2, 0,            /* 0x21 */
 301                 {{0, 0},
 302                 {5, 5},
 303                 {0, 0},
 304                 {0, 0}
 305                 }
 306         },
 307         {0, 0, 2, 0,            /* 0x22 */
 308                 {{1, 1},
 309                 {5, 5},
 310                 {0, 0},
 311                 {0, 0}
 312                 }
 313         },
 314         {1, 0, 2, 0,            /* 0x23 */
 315                 {{0, 1},
 316                 {5, 5},
 317                 {0, 0},
 318                 {0, 0}
 319                 }
 320         },
 321         {0, 0, 2, 0,            /* 0x24 */
 322                 {{2, 2},
 323                 {5, 5},
 324                 {0, 0},
 325                 {0, 0}
 326                 }
 327         },
 328         {1, 0, 3, 0,            /* 0x25 */
 329                 {{0, 0},
 330                 {2, 2},
 331                 {5, 5},
 332                 {0, 0}
 333                 }
 334         },
 335         {0, 0, 2, 0,            /* 0x26 */
 336                 {{1, 2},
 337                 {5, 5},
 338                 {0, 0},
 339                 {0, 0}
 340                 }
 341         },
 342         {1, 0, 2, 0,            /* 0x27 */
 343                 {{0, 2},
 344                 {5, 5},
 345                 {0, 0},
 346                 {0, 0}
 347                 }
 348         },
 349         {0, 0, 2, 0,            /* 0x28 */
 350                 {{3, 3},
 351                 {5, 5},
 352                 {0, 0},
 353                 {0, 0}
 354                 }
 355         },
 356         {1, 0, 3, 0,            /* 0x29 */
 357                 {{0, 0},
 358                 {3, 3},
 359                 {5, 5},
 360                 {0, 0}
 361                 }
 362         },
 363         {0, 0, 3, 0,            /* 0x2a */
 364                 {{1, 1},
 365                 {3, 3},
 366                 {5, 5},
 367                 {0, 0}
 368                 }
 369         },
 370         {1, 0, 3, 0,            /* 0x2b */
 371                 {{0, 1},
 372                 {3, 3},
 373                 {5, 5},
 374                 {0, 0}
 375                 }
 376         },
 377         {0, 0, 2, 0,            /* 0x2c */
 378                 {{2, 3},
 379                 {5, 5},
 380                 {0, 0},
 381                 {0, 0}
 382                 }
 383         },
 384         {1, 0, 3, 0,            /* 0x2d */
 385                 {{0, 0},
 386                 {2, 3},
 387                 {5, 5},
 388                 {0, 0}
 389                 }
 390         },
 391         {0, 0, 2, 0,            /* 0x2e */
 392                 {{1, 3},
 393                 {5, 5},
 394                 {0, 0},
 395                 {0, 0}
 396                 }
 397         },
 398         {1, 0, 2, 0,            /* 0x2f */
 399                 {{0, 3},
 400                 {5, 5},
 401                 {0, 0},
 402                 {0, 0}
 403                 }
 404         },
 405         {0, 0, 1, 0,            /* 0x30 */
 406                 {{4, 5},
 407                 {0, 0},
 408                 {0, 0},
 409                 {0, 0}
 410                 }
 411         },
 412         {1, 0, 2, 0,            /* 0x31 */
 413                 {{0, 0},
 414                 {4, 5},
 415                 {0, 0},
 416                 {0, 0}
 417                 }
 418         },
 419         {0, 0, 2, 0,            /* 0x32 */
 420                 {{1, 1},
 421                 {4, 5},
 422                 {0, 0},
 423                 {0, 0}
 424                 }
 425         },
 426         {1, 0, 2, 0,            /* 0x33 */
 427                 {{0, 1},
 428                 {4, 5},
 429                 {0, 0},
 430                 {0, 0}
 431                 }
 432         },
 433         {0, 0, 2, 0,            /* 0x34 */
 434                 {{2, 2},
 435                 {4, 5},
 436                 {0, 0},
 437                 {0, 0}
 438                 }
 439         },
 440         {1, 0, 3, 0,            /* 0x35 */
 441                 {{0, 0},
 442                 {2, 2},
 443                 {4, 5},
 444                 {0, 0}
 445                 }
 446         },
 447         {0, 0, 2, 0,            /* 0x36 */
 448                 {{1, 2},
 449                 {4, 5},
 450                 {0, 0},
 451                 {0, 0}
 452                 }
 453         },
 454         {1, 0, 2, 0,            /* 0x37 */
 455                 {{0, 2},
 456                 {4, 5},
 457                 {0, 0},
 458                 {0, 0}
 459                 }
 460         },
 461         {0, 0, 1, 0,            /* 0x38 */
 462                 {{3, 5},
 463                 {0, 0},
 464                 {0, 0},
 465                 {0, 0}
 466                 }
 467         },
 468         {1, 0, 2, 0,            /* 0x39 */
 469                 {{0, 0},
 470                 {3, 5},
 471                 {0, 0},
 472                 {0, 0}
 473                 }
 474         },
 475         {0, 0, 2, 0,            /* 0x3a */
 476                 {{1, 1},
 477                 {3, 5},
 478                 {0, 0},
 479                 {0, 0}
 480                 }
 481         },
 482         {1, 0, 2, 0,            /* 0x3b */
 483                 {{0, 1},
 484                 {3, 5},
 485                 {0, 0},
 486                 {0, 0}
 487                 }
 488         },
 489         {0, 0, 1, 0,            /* 0x3c */
 490                 {{2, 5},
 491                 {0, 0},
 492                 {0, 0},
 493                 {0, 0}
 494                 }
 495         },
 496         {1, 0, 2, 0,            /* 0x3d */
 497                 {{0, 0},
 498                 {2, 5},
 499                 {0, 0},
 500                 {0, 0}
 501                 }
 502         },
 503         {0, 0, 1, 0,            /* 0x3e */
 504                 {{1, 5},
 505                 {0, 0},
 506                 {0, 0},
 507                 {0, 0}
 508                 }
 509         },
 510         {1, 0, 1, 0,            /* 0x3f */
 511                 {{0, 5},
 512                 {0, 0},
 513                 {0, 0},
 514                 {0, 0}
 515                 }
 516         },
 517         {0, 0, 1, 0,            /* 0x40 */
 518                 {{6, 6},
 519                 {0, 0},
 520                 {0, 0},
 521                 {0, 0}
 522                 }
 523         },
 524         {1, 0, 2, 0,            /* 0x41 */
 525                 {{0, 0},
 526                 {6, 6},
 527                 {0, 0},
 528                 {0, 0}
 529                 }
 530         },
 531         {0, 0, 2, 0,            /* 0x42 */
 532                 {{1, 1},
 533                 {6, 6},
 534                 {0, 0},
 535                 {0, 0}
 536                 }
 537         },
 538         {1, 0, 2, 0,            /* 0x43 */
 539                 {{0, 1},
 540                 {6, 6},
 541                 {0, 0},
 542                 {0, 0}
 543                 }
 544         },
 545         {0, 0, 2, 0,            /* 0x44 */
 546                 {{2, 2},
 547                 {6, 6},
 548                 {0, 0},
 549                 {0, 0}
 550                 }
 551         },
 552         {1, 0, 3, 0,            /* 0x45 */
 553                 {{0, 0},
 554                 {2, 2},
 555                 {6, 6},
 556                 {0, 0}
 557                 }
 558         },
 559         {0, 0, 2, 0,            /* 0x46 */
 560                 {{1, 2},
 561                 {6, 6},
 562                 {0, 0},
 563                 {0, 0}
 564                 }
 565         },
 566         {1, 0, 2, 0,            /* 0x47 */
 567                 {{0, 2},
 568                 {6, 6},
 569                 {0, 0},
 570                 {0, 0}
 571                 }
 572         },
 573         {0, 0, 2, 0,            /* 0x48 */
 574                 {{3, 3},
 575                 {6, 6},
 576                 {0, 0},
 577                 {0, 0}
 578                 }
 579         },
 580         {1, 0, 3, 0,            /* 0x49 */
 581                 {{0, 0},
 582                 {3, 3},
 583                 {6, 6},
 584                 {0, 0}
 585                 }
 586         },
 587         {0, 0, 3, 0,            /* 0x4a */
 588                 {{1, 1},
 589                 {3, 3},
 590                 {6, 6},
 591                 {0, 0}
 592                 }
 593         },
 594         {1, 0, 3, 0,            /* 0x4b */
 595                 {{0, 1},
 596                 {3, 3},
 597                 {6, 6},
 598                 {0, 0}
 599                 }
 600         },
 601         {0, 0, 2, 0,            /* 0x4c */
 602                 {{2, 3},
 603                 {6, 6},
 604                 {0, 0},
 605                 {0, 0}
 606                 }
 607         },
 608         {1, 0, 3, 0,            /* 0x4d */
 609                 {{0, 0},
 610                 {2, 3},
 611                 {6, 6},
 612                 {0, 0}
 613                 }
 614         },
 615         {0, 0, 2, 0,            /* 0x4e */
 616                 {{1, 3},
 617                 {6, 6},
 618                 {0, 0},
 619                 {0, 0}
 620                 }
 621         },
 622         {1, 0, 2, 0,            /* 0x4f */
 623                 {{0, 3},
 624                 {6, 6},
 625                 {0, 0},
 626                 {0, 0}
 627                 }
 628         },
 629         {0, 0, 2, 0,            /* 0x50 */
 630                 {{4, 4},
 631                 {6, 6},
 632                 {0, 0},
 633                 {0, 0}
 634                 }
 635         },
 636         {1, 0, 3, 0,            /* 0x51 */
 637                 {{0, 0},
 638                 {4, 4},
 639                 {6, 6},
 640                 {0, 0}
 641                 }
 642         },
 643         {0, 0, 3, 0,            /* 0x52 */
 644                 {{1, 1},
 645                 {4, 4},
 646                 {6, 6},
 647                 {0, 0}
 648                 }
 649         },
 650         {1, 0, 3, 0,            /* 0x53 */
 651                 {{0, 1},
 652                 {4, 4},
 653                 {6, 6},
 654                 {0, 0}
 655                 }
 656         },
 657         {0, 0, 3, 0,            /* 0x54 */
 658                 {{2, 2},
 659                 {4, 4},
 660                 {6, 6},
 661                 {0, 0}
 662                 }
 663         },
 664         {1, 0, 4, 0,            /* 0x55 */
 665                 {{0, 0},
 666                 {2, 2},
 667                 {4, 4},
 668                 {6, 6}
 669                 }
 670         },
 671         {0, 0, 3, 0,            /* 0x56 */
 672                 {{1, 2},
 673                 {4, 4},
 674                 {6, 6},
 675                 {0, 0}
 676                 }
 677         },
 678         {1, 0, 3, 0,            /* 0x57 */
 679                 {{0, 2},
 680                 {4, 4},
 681                 {6, 6},
 682                 {0, 0}
 683                 }
 684         },
 685         {0, 0, 2, 0,            /* 0x58 */
 686                 {{3, 4},
 687                 {6, 6},
 688                 {0, 0},
 689                 {0, 0}
 690                 }
 691         },
 692         {1, 0, 3, 0,            /* 0x59 */
 693                 {{0, 0},
 694                 {3, 4},
 695                 {6, 6},
 696                 {0, 0}
 697                 }
 698         },
 699         {0, 0, 3, 0,            /* 0x5a */
 700                 {{1, 1},
 701                 {3, 4},
 702                 {6, 6},
 703                 {0, 0}
 704                 }
 705         },
 706         {1, 0, 3, 0,            /* 0x5b */
 707                 {{0, 1},
 708                 {3, 4},
 709                 {6, 6},
 710                 {0, 0}
 711                 }
 712         },
 713         {0, 0, 2, 0,            /* 0x5c */
 714                 {{2, 4},
 715                 {6, 6},
 716                 {0, 0},
 717                 {0, 0}
 718                 }
 719         },
 720         {1, 0, 3, 0,            /* 0x5d */
 721                 {{0, 0},
 722                 {2, 4},
 723                 {6, 6},
 724                 {0, 0}
 725                 }
 726         },
 727         {0, 0, 2, 0,            /* 0x5e */
 728                 {{1, 4},
 729                 {6, 6},
 730                 {0, 0},
 731                 {0, 0}
 732                 }
 733         },
 734         {1, 0, 2, 0,            /* 0x5f */
 735                 {{0, 4},
 736                 {6, 6},
 737                 {0, 0},
 738                 {0, 0}
 739                 }
 740         },
 741         {0, 0, 1, 0,            /* 0x60 */
 742                 {{5, 6},
 743                 {0, 0},
 744                 {0, 0},
 745                 {0, 0}
 746                 }
 747         },
 748         {1, 0, 2, 0,            /* 0x61 */
 749                 {{0, 0},
 750                 {5, 6},
 751                 {0, 0},
 752                 {0, 0}
 753                 }
 754         },
 755         {0, 0, 2, 0,            /* 0x62 */
 756                 {{1, 1},
 757                 {5, 6},
 758                 {0, 0},
 759                 {0, 0}
 760                 }
 761         },
 762         {1, 0, 2, 0,            /* 0x63 */
 763                 {{0, 1},
 764                 {5, 6},
 765                 {0, 0},
 766                 {0, 0}
 767                 }
 768         },
 769         {0, 0, 2, 0,            /* 0x64 */
 770                 {{2, 2},
 771                 {5, 6},
 772                 {0, 0},
 773                 {0, 0}
 774                 }
 775         },
 776         {1, 0, 3, 0,            /* 0x65 */
 777                 {{0, 0},
 778                 {2, 2},
 779                 {5, 6},
 780                 {0, 0}
 781                 }
 782         },
 783         {0, 0, 2, 0,            /* 0x66 */
 784                 {{1, 2},
 785                 {5, 6},
 786                 {0, 0},
 787                 {0, 0}
 788                 }
 789         },
 790         {1, 0, 2, 0,            /* 0x67 */
 791                 {{0, 2},
 792                 {5, 6},
 793                 {0, 0},
 794                 {0, 0}
 795                 }
 796         },
 797         {0, 0, 2, 0,            /* 0x68 */
 798                 {{3, 3},
 799                 {5, 6},
 800                 {0, 0},
 801                 {0, 0}
 802                 }
 803         },
 804         {1, 0, 3, 0,            /* 0x69 */
 805                 {{0, 0},
 806                 {3, 3},
 807                 {5, 6},
 808                 {0, 0}
 809                 }
 810         },
 811         {0, 0, 3, 0,            /* 0x6a */
 812                 {{1, 1},
 813                 {3, 3},
 814                 {5, 6},
 815                 {0, 0}
 816                 }
 817         },
 818         {1, 0, 3, 0,            /* 0x6b */
 819                 {{0, 1},
 820                 {3, 3},
 821                 {5, 6},
 822                 {0, 0}
 823                 }
 824         },
 825         {0, 0, 2, 0,            /* 0x6c */
 826                 {{2, 3},
 827                 {5, 6},
 828                 {0, 0},
 829                 {0, 0}
 830                 }
 831         },
 832         {1, 0, 3, 0,            /* 0x6d */
 833                 {{0, 0},
 834                 {2, 3},
 835                 {5, 6},
 836                 {0, 0}
 837                 }
 838         },
 839         {0, 0, 2, 0,            /* 0x6e */
 840                 {{1, 3},
 841                 {5, 6},
 842                 {0, 0},
 843                 {0, 0}
 844                 }
 845         },
 846         {1, 0, 2, 0,            /* 0x6f */
 847                 {{0, 3},
 848                 {5, 6},
 849                 {0, 0},
 850                 {0, 0}
 851                 }
 852         },
 853         {0, 0, 1, 0,            /* 0x70 */
 854                 {{4, 6},
 855                 {0, 0},
 856                 {0, 0},
 857                 {0, 0}
 858                 }
 859         },
 860         {1, 0, 2, 0,            /* 0x71 */
 861                 {{0, 0},
 862                 {4, 6},
 863                 {0, 0},
 864                 {0, 0}
 865                 }
 866         },
 867         {0, 0, 2, 0,            /* 0x72 */
 868                 {{1, 1},
 869                 {4, 6},
 870                 {0, 0},
 871                 {0, 0}
 872                 }
 873         },
 874         {1, 0, 2, 0,            /* 0x73 */
 875                 {{0, 1},
 876                 {4, 6},
 877                 {0, 0},
 878                 {0, 0}
 879                 }
 880         },
 881         {0, 0, 2, 0,            /* 0x74 */
 882                 {{2, 2},
 883                 {4, 6},
 884                 {0, 0},
 885                 {0, 0}
 886                 }
 887         },
 888         {1, 0, 3, 0,            /* 0x75 */
 889                 {{0, 0},
 890                 {2, 2},
 891                 {4, 6},
 892                 {0, 0}
 893                 }
 894         },
 895         {0, 0, 2, 0,            /* 0x76 */
 896                 {{1, 2},
 897                 {4, 6},
 898                 {0, 0},
 899                 {0, 0}
 900                 }
 901         },
 902         {1, 0, 2, 0,            /* 0x77 */
 903                 {{0, 2},
 904                 {4, 6},
 905                 {0, 0},
 906                 {0, 0}
 907                 }
 908         },
 909         {0, 0, 1, 0,            /* 0x78 */
 910                 {{3, 6},
 911                 {0, 0},
 912                 {0, 0},
 913                 {0, 0}
 914                 }
 915         },
 916         {1, 0, 2, 0,            /* 0x79 */
 917                 {{0, 0},
 918                 {3, 6},
 919                 {0, 0},
 920                 {0, 0}
 921                 }
 922         },
 923         {0, 0, 2, 0,            /* 0x7a */
 924                 {{1, 1},
 925                 {3, 6},
 926                 {0, 0},
 927                 {0, 0}
 928                 }
 929         },
 930         {1, 0, 2, 0,            /* 0x7b */
 931                 {{0, 1},
 932                 {3, 6},
 933                 {0, 0},
 934                 {0, 0}
 935                 }
 936         },
 937         {0, 0, 1, 0,            /* 0x7c */
 938                 {{2, 6},
 939                 {0, 0},
 940                 {0, 0},
 941                 {0, 0}
 942                 }
 943         },
 944         {1, 0, 2, 0,            /* 0x7d */
 945                 {{0, 0},
 946                 {2, 6},
 947                 {0, 0},
 948                 {0, 0}
 949                 }
 950         },
 951         {0, 0, 1, 0,            /* 0x7e */
 952                 {{1, 6},
 953                 {0, 0},
 954                 {0, 0},
 955                 {0, 0}
 956                 }
 957         },
 958         {1, 0, 1, 0,            /* 0x7f */
 959                 {{0, 6},
 960                 {0, 0},
 961                 {0, 0},
 962                 {0, 0}
 963                 }
 964         },
 965         {0, 1, 1, 0,            /* 0x80 */
 966                 {{7, 7},
 967                 {0, 0},
 968                 {0, 0},
 969                 {0, 0}
 970                 }
 971         },
 972         {1, 1, 2, 0,            /* 0x81 */
 973                 {{0, 0},
 974                 {7, 7},
 975                 {0, 0},
 976                 {0, 0}
 977                 }
 978         },
 979         {0, 1, 2, 0,            /* 0x82 */
 980                 {{1, 1},
 981                 {7, 7},
 982                 {0, 0},
 983                 {0, 0}
 984                 }
 985         },
 986         {1, 1, 2, 0,            /* 0x83 */
 987                 {{0, 1},
 988                 {7, 7},
 989                 {0, 0},
 990                 {0, 0}
 991                 }
 992         },
 993         {0, 1, 2, 0,            /* 0x84 */
 994                 {{2, 2},
 995                 {7, 7},
 996                 {0, 0},
 997                 {0, 0}
 998                 }
 999         },
1000         {1, 1, 3, 0,            /* 0x85 */
1001                 {{0, 0},
1002                 {2, 2},
1003                 {7, 7},
1004                 {0, 0}
1005                 }
1006         },
1007         {0, 1, 2, 0,            /* 0x86 */
1008                 {{1, 2},
1009                 {7, 7},
1010                 {0, 0},
1011                 {0, 0}
1012                 }
1013         },
1014         {1, 1, 2, 0,            /* 0x87 */
1015                 {{0, 2},
1016                 {7, 7},
1017                 {0, 0},
1018                 {0, 0}
1019                 }
1020         },
1021         {0, 1, 2, 0,            /* 0x88 */
1022                 {{3, 3},
1023                 {7, 7},
1024                 {0, 0},
1025                 {0, 0}
1026                 }
1027         },
1028         {1, 1, 3, 0,            /* 0x89 */
1029                 {{0, 0},
1030                 {3, 3},
1031                 {7, 7},
1032                 {0, 0}
1033                 }
1034         },
1035         {0, 1, 3, 0,            /* 0x8a */
1036                 {{1, 1},
1037                 {3, 3},
1038                 {7, 7},
1039                 {0, 0}
1040                 }
1041         },
1042         {1, 1, 3, 0,            /* 0x8b */
1043                 {{0, 1},
1044                 {3, 3},
1045                 {7, 7},
1046                 {0, 0}
1047                 }
1048         },
1049         {0, 1, 2, 0,            /* 0x8c */
1050                 {{2, 3},
1051                 {7, 7},
1052                 {0, 0},
1053                 {0, 0}
1054                 }
1055         },
1056         {1, 1, 3, 0,            /* 0x8d */
1057                 {{0, 0},
1058                 {2, 3},
1059                 {7, 7},
1060                 {0, 0}
1061                 }
1062         },
1063         {0, 1, 2, 0,            /* 0x8e */
1064                 {{1, 3},
1065                 {7, 7},
1066                 {0, 0},
1067                 {0, 0}
1068                 }
1069         },
1070         {1, 1, 2, 0,            /* 0x8f */
1071                 {{0, 3},
1072                 {7, 7},
1073                 {0, 0},
1074                 {0, 0}
1075                 }
1076         },
1077         {0, 1, 2, 0,            /* 0x90 */
1078                 {{4, 4},
1079                 {7, 7},
1080                 {0, 0},
1081                 {0, 0}
1082                 }
1083         },
1084         {1, 1, 3, 0,            /* 0x91 */
1085                 {{0, 0},
1086                 {4, 4},
1087                 {7, 7},
1088                 {0, 0}
1089                 }
1090         },
1091         {0, 1, 3, 0,            /* 0x92 */
1092                 {{1, 1},
1093                 {4, 4},
1094                 {7, 7},
1095                 {0, 0}
1096                 }
1097         },
1098         {1, 1, 3, 0,            /* 0x93 */
1099                 {{0, 1},
1100                 {4, 4},
1101                 {7, 7},
1102                 {0, 0}
1103                 }
1104         },
1105         {0, 1, 3, 0,            /* 0x94 */
1106                 {{2, 2},
1107                 {4, 4},
1108                 {7, 7},
1109                 {0, 0}
1110                 }
1111         },
1112         {1, 1, 4, 0,            /* 0x95 */
1113                 {{0, 0},
1114                 {2, 2},
1115                 {4, 4},
1116                 {7, 7}
1117                 }
1118         },
1119         {0, 1, 3, 0,            /* 0x96 */
1120                 {{1, 2},
1121                 {4, 4},
1122                 {7, 7},
1123                 {0, 0}
1124                 }
1125         },
1126         {1, 1, 3, 0,            /* 0x97 */
1127                 {{0, 2},
1128                 {4, 4},
1129                 {7, 7},
1130                 {0, 0}
1131                 }
1132         },
1133         {0, 1, 2, 0,            /* 0x98 */
1134                 {{3, 4},
1135                 {7, 7},
1136                 {0, 0},
1137                 {0, 0}
1138                 }
1139         },
1140         {1, 1, 3, 0,            /* 0x99 */
1141                 {{0, 0},
1142                 {3, 4},
1143                 {7, 7},
1144                 {0, 0}
1145                 }
1146         },
1147         {0, 1, 3, 0,            /* 0x9a */
1148                 {{1, 1},
1149                 {3, 4},
1150                 {7, 7},
1151                 {0, 0}
1152                 }
1153         },
1154         {1, 1, 3, 0,            /* 0x9b */
1155                 {{0, 1},
1156                 {3, 4},
1157                 {7, 7},
1158                 {0, 0}
1159                 }
1160         },
1161         {0, 1, 2, 0,            /* 0x9c */
1162                 {{2, 4},
1163                 {7, 7},
1164                 {0, 0},
1165                 {0, 0}
1166                 }
1167         },
1168         {1, 1, 3, 0,            /* 0x9d */
1169                 {{0, 0},
1170                 {2, 4},
1171                 {7, 7},
1172                 {0, 0}
1173                 }
1174         },
1175         {0, 1, 2, 0,            /* 0x9e */
1176                 {{1, 4},
1177                 {7, 7},
1178                 {0, 0},
1179                 {0, 0}
1180                 }
1181         },
1182         {1, 1, 2, 0,            /* 0x9f */
1183                 {{0, 4},
1184                 {7, 7},
1185                 {0, 0},
1186                 {0, 0}
1187                 }
1188         },
1189         {0, 1, 2, 0,            /* 0xa0 */
1190                 {{5, 5},
1191                 {7, 7},
1192                 {0, 0},
1193                 {0, 0}
1194                 }
1195         },
1196         {1, 1, 3, 0,            /* 0xa1 */
1197                 {{0, 0},
1198                 {5, 5},
1199                 {7, 7},
1200                 {0, 0}
1201                 }
1202         },
1203         {0, 1, 3, 0,            /* 0xa2 */
1204                 {{1, 1},
1205                 {5, 5},
1206                 {7, 7},
1207                 {0, 0}
1208                 }
1209         },
1210         {1, 1, 3, 0,            /* 0xa3 */
1211                 {{0, 1},
1212                 {5, 5},
1213                 {7, 7},
1214                 {0, 0}
1215                 }
1216         },
1217         {0, 1, 3, 0,            /* 0xa4 */
1218                 {{2, 2},
1219                 {5, 5},
1220                 {7, 7},
1221                 {0, 0}
1222                 }
1223         },
1224         {1, 1, 4, 0,            /* 0xa5 */
1225                 {{0, 0},
1226                 {2, 2},
1227                 {5, 5},
1228                 {7, 7}
1229                 }
1230         },
1231         {0, 1, 3, 0,            /* 0xa6 */
1232                 {{1, 2},
1233                 {5, 5},
1234                 {7, 7},
1235                 {0, 0}
1236                 }
1237         },
1238         {1, 1, 3, 0,            /* 0xa7 */
1239                 {{0, 2},
1240                 {5, 5},
1241                 {7, 7},
1242                 {0, 0}
1243                 }
1244         },
1245         {0, 1, 3, 0,            /* 0xa8 */
1246                 {{3, 3},
1247                 {5, 5},
1248                 {7, 7},
1249                 {0, 0}
1250                 }
1251         },
1252         {1, 1, 4, 0,            /* 0xa9 */
1253                 {{0, 0},
1254                 {3, 3},
1255                 {5, 5},
1256                 {7, 7}
1257                 }
1258         },
1259         {0, 1, 4, 0,            /* 0xaa */
1260                 {{1, 1},
1261                 {3, 3},
1262                 {5, 5},
1263                 {7, 7}
1264                 }
1265         },
1266         {1, 1, 4, 0,            /* 0xab */
1267                 {{0, 1},
1268                 {3, 3},
1269                 {5, 5},
1270                 {7, 7}
1271                 }
1272         },
1273         {0, 1, 3, 0,            /* 0xac */
1274                 {{2, 3},
1275                 {5, 5},
1276                 {7, 7},
1277                 {0, 0}
1278                 }
1279         },
1280         {1, 1, 4, 0,            /* 0xad */
1281                 {{0, 0},
1282                 {2, 3},
1283                 {5, 5},
1284                 {7, 7}
1285                 }
1286         },
1287         {0, 1, 3, 0,            /* 0xae */
1288                 {{1, 3},
1289                 {5, 5},
1290                 {7, 7},
1291                 {0, 0}
1292                 }
1293         },
1294         {1, 1, 3, 0,            /* 0xaf */
1295                 {{0, 3},
1296                 {5, 5},
1297                 {7, 7},
1298                 {0, 0}
1299                 }
1300         },
1301         {0, 1, 2, 0,            /* 0xb0 */
1302                 {{4, 5},
1303                 {7, 7},
1304                 {0, 0},
1305                 {0, 0}
1306                 }
1307         },
1308         {1, 1, 3, 0,            /* 0xb1 */
1309                 {{0, 0},
1310                 {4, 5},
1311                 {7, 7},
1312                 {0, 0}
1313                 }
1314         },
1315         {0, 1, 3, 0,            /* 0xb2 */
1316                 {{1, 1},
1317                 {4, 5},
1318                 {7, 7},
1319                 {0, 0}
1320                 }
1321         },
1322         {1, 1, 3, 0,            /* 0xb3 */
1323                 {{0, 1},
1324                 {4, 5},
1325                 {7, 7},
1326                 {0, 0}
1327                 }
1328         },
1329         {0, 1, 3, 0,            /* 0xb4 */
1330                 {{2, 2},
1331                 {4, 5},
1332                 {7, 7},
1333                 {0, 0}
1334                 }
1335         },
1336         {1, 1, 4, 0,            /* 0xb5 */
1337                 {{0, 0},
1338                 {2, 2},
1339                 {4, 5},
1340                 {7, 7}
1341                 }
1342         },
1343         {0, 1, 3, 0,            /* 0xb6 */
1344                 {{1, 2},
1345                 {4, 5},
1346                 {7, 7},
1347                 {0, 0}
1348                 }
1349         },
1350         {1, 1, 3, 0,            /* 0xb7 */
1351                 {{0, 2},
1352                 {4, 5},
1353                 {7, 7},
1354                 {0, 0}
1355                 }
1356         },
1357         {0, 1, 2, 0,            /* 0xb8 */
1358                 {{3, 5},
1359                 {7, 7},
1360                 {0, 0},
1361                 {0, 0}
1362                 }
1363         },
1364         {1, 1, 3, 0,            /* 0xb9 */
1365                 {{0, 0},
1366                 {3, 5},
1367                 {7, 7},
1368                 {0, 0}
1369                 }
1370         },
1371         {0, 1, 3, 0,            /* 0xba */
1372                 {{1, 1},
1373                 {3, 5},
1374                 {7, 7},
1375                 {0, 0}
1376                 }
1377         },
1378         {1, 1, 3, 0,            /* 0xbb */
1379                 {{0, 1},
1380                 {3, 5},
1381                 {7, 7},
1382                 {0, 0}
1383                 }
1384         },
1385         {0, 1, 2, 0,            /* 0xbc */
1386                 {{2, 5},
1387                 {7, 7},
1388                 {0, 0},
1389                 {0, 0}
1390                 }
1391         },
1392         {1, 1, 3, 0,            /* 0xbd */
1393                 {{0, 0},
1394                 {2, 5},
1395                 {7, 7},
1396                 {0, 0}
1397                 }
1398         },
1399         {0, 1, 2, 0,            /* 0xbe */
1400                 {{1, 5},
1401                 {7, 7},
1402                 {0, 0},
1403                 {0, 0}
1404                 }
1405         },
1406         {1, 1, 2, 0,            /* 0xbf */
1407                 {{0, 5},
1408                 {7, 7},
1409                 {0, 0},
1410                 {0, 0}
1411                 }
1412         },
1413         {0, 1, 1, 0,            /* 0xc0 */
1414                 {{6, 7},
1415                 {0, 0},
1416                 {0, 0},
1417                 {0, 0}
1418                 }
1419         },
1420         {1, 1, 2, 0,            /* 0xc1 */
1421                 {{0, 0},
1422                 {6, 7},
1423                 {0, 0},
1424                 {0, 0}
1425                 }
1426         },
1427         {0, 1, 2, 0,            /* 0xc2 */
1428                 {{1, 1},
1429                 {6, 7},
1430                 {0, 0},
1431                 {0, 0}
1432                 }
1433         },
1434         {1, 1, 2, 0,            /* 0xc3 */
1435                 {{0, 1},
1436                 {6, 7},
1437                 {0, 0},
1438                 {0, 0}
1439                 }
1440         },
1441         {0, 1, 2, 0,            /* 0xc4 */
1442                 {{2, 2},
1443                 {6, 7},
1444                 {0, 0},
1445                 {0, 0}
1446                 }
1447         },
1448         {1, 1, 3, 0,            /* 0xc5 */
1449                 {{0, 0},
1450                 {2, 2},
1451                 {6, 7},
1452                 {0, 0}
1453                 }
1454         },
1455         {0, 1, 2, 0,            /* 0xc6 */
1456                 {{1, 2},
1457                 {6, 7},
1458                 {0, 0},
1459                 {0, 0}
1460                 }
1461         },
1462         {1, 1, 2, 0,            /* 0xc7 */
1463                 {{0, 2},
1464                 {6, 7},
1465                 {0, 0},
1466                 {0, 0}
1467                 }
1468         },
1469         {0, 1, 2, 0,            /* 0xc8 */
1470                 {{3, 3},
1471                 {6, 7},
1472                 {0, 0},
1473                 {0, 0}
1474                 }
1475         },
1476         {1, 1, 3, 0,            /* 0xc9 */
1477                 {{0, 0},
1478                 {3, 3},
1479                 {6, 7},
1480                 {0, 0}
1481                 }
1482         },
1483         {0, 1, 3, 0,            /* 0xca */
1484                 {{1, 1},
1485                 {3, 3},
1486                 {6, 7},
1487                 {0, 0}
1488                 }
1489         },
1490         {1, 1, 3, 0,            /* 0xcb */
1491                 {{0, 1},
1492                 {3, 3},
1493                 {6, 7},
1494                 {0, 0}
1495                 }
1496         },
1497         {0, 1, 2, 0,            /* 0xcc */
1498                 {{2, 3},
1499                 {6, 7},
1500                 {0, 0},
1501                 {0, 0}
1502                 }
1503         },
1504         {1, 1, 3, 0,            /* 0xcd */
1505                 {{0, 0},
1506                 {2, 3},
1507                 {6, 7},
1508                 {0, 0}
1509                 }
1510         },
1511         {0, 1, 2, 0,            /* 0xce */
1512                 {{1, 3},
1513                 {6, 7},
1514                 {0, 0},
1515                 {0, 0}
1516                 }
1517         },
1518         {1, 1, 2, 0,            /* 0xcf */
1519                 {{0, 3},
1520                 {6, 7},
1521                 {0, 0},
1522                 {0, 0}
1523                 }
1524         },
1525         {0, 1, 2, 0,            /* 0xd0 */
1526                 {{4, 4},
1527                 {6, 7},
1528                 {0, 0},
1529                 {0, 0}
1530                 }
1531         },
1532         {1, 1, 3, 0,            /* 0xd1 */
1533                 {{0, 0},
1534                 {4, 4},
1535                 {6, 7},
1536                 {0, 0}
1537                 }
1538         },
1539         {0, 1, 3, 0,            /* 0xd2 */
1540                 {{1, 1},
1541                 {4, 4},
1542                 {6, 7},
1543                 {0, 0}
1544                 }
1545         },
1546         {1, 1, 3, 0,            /* 0xd3 */
1547                 {{0, 1},
1548                 {4, 4},
1549                 {6, 7},
1550                 {0, 0}
1551                 }
1552         },
1553         {0, 1, 3, 0,            /* 0xd4 */
1554                 {{2, 2},
1555                 {4, 4},
1556                 {6, 7},
1557                 {0, 0}
1558                 }
1559         },
1560         {1, 1, 4, 0,            /* 0xd5 */
1561                 {{0, 0},
1562                 {2, 2},
1563                 {4, 4},
1564                 {6, 7}
1565                 }
1566         },
1567         {0, 1, 3, 0,            /* 0xd6 */
1568                 {{1, 2},
1569                 {4, 4},
1570                 {6, 7},
1571                 {0, 0}
1572                 }
1573         },
1574         {1, 1, 3, 0,            /* 0xd7 */
1575                 {{0, 2},
1576                 {4, 4},
1577                 {6, 7},
1578                 {0, 0}
1579                 }
1580         },
1581         {0, 1, 2, 0,            /* 0xd8 */
1582                 {{3, 4},
1583                 {6, 7},
1584                 {0, 0},
1585                 {0, 0}
1586                 }
1587         },
1588         {1, 1, 3, 0,            /* 0xd9 */
1589                 {{0, 0},
1590                 {3, 4},
1591                 {6, 7},
1592                 {0, 0}
1593                 }
1594         },
1595         {0, 1, 3, 0,            /* 0xda */
1596                 {{1, 1},
1597                 {3, 4},
1598                 {6, 7},
1599                 {0, 0}
1600                 }
1601         },
1602         {1, 1, 3, 0,            /* 0xdb */
1603                 {{0, 1},
1604                 {3, 4},
1605                 {6, 7},
1606                 {0, 0}
1607                 }
1608         },
1609         {0, 1, 2, 0,            /* 0xdc */
1610                 {{2, 4},
1611                 {6, 7},
1612                 {0, 0},
1613                 {0, 0}
1614                 }
1615         },
1616         {1, 1, 3, 0,            /* 0xdd */
1617                 {{0, 0},
1618                 {2, 4},
1619                 {6, 7},
1620                 {0, 0}
1621                 }
1622         },
1623         {0, 1, 2, 0,            /* 0xde */
1624                 {{1, 4},
1625                 {6, 7},
1626                 {0, 0},
1627                 {0, 0}
1628                 }
1629         },
1630         {1, 1, 2, 0,            /* 0xdf */
1631                 {{0, 4},
1632                 {6, 7},
1633                 {0, 0},
1634                 {0, 0}
1635                 }
1636         },
1637         {0, 1, 1, 0,            /* 0xe0 */
1638                 {{5, 7},
1639                 {0, 0},
1640                 {0, 0},
1641                 {0, 0}
1642                 }
1643         },
1644         {1, 1, 2, 0,            /* 0xe1 */
1645                 {{0, 0},
1646                 {5, 7},
1647                 {0, 0},
1648                 {0, 0}
1649                 }
1650         },
1651         {0, 1, 2, 0,            /* 0xe2 */
1652                 {{1, 1},
1653                 {5, 7},
1654                 {0, 0},
1655                 {0, 0}
1656                 }
1657         },
1658         {1, 1, 2, 0,            /* 0xe3 */
1659                 {{0, 1},
1660                 {5, 7},
1661                 {0, 0},
1662                 {0, 0}
1663                 }
1664         },
1665         {0, 1, 2, 0,            /* 0xe4 */
1666                 {{2, 2},
1667                 {5, 7},
1668                 {0, 0},
1669                 {0, 0}
1670                 }
1671         },
1672         {1, 1, 3, 0,            /* 0xe5 */
1673                 {{0, 0},
1674                 {2, 2},
1675                 {5, 7},
1676                 {0, 0}
1677                 }
1678         },
1679         {0, 1, 2, 0,            /* 0xe6 */
1680                 {{1, 2},
1681                 {5, 7},
1682                 {0, 0},
1683                 {0, 0}
1684                 }
1685         },
1686         {1, 1, 2, 0,            /* 0xe7 */
1687                 {{0, 2},
1688                 {5, 7},
1689                 {0, 0},
1690                 {0, 0}
1691                 }
1692         },
1693         {0, 1, 2, 0,            /* 0xe8 */
1694                 {{3, 3},
1695                 {5, 7},
1696                 {0, 0},
1697                 {0, 0}
1698                 }
1699         },
1700         {1, 1, 3, 0,            /* 0xe9 */
1701                 {{0, 0},
1702                 {3, 3},
1703                 {5, 7},
1704                 {0, 0}
1705                 }
1706         },
1707         {0, 1, 3, 0,            /* 0xea */
1708                 {{1, 1},
1709                 {3, 3},
1710                 {5, 7},
1711                 {0, 0}
1712                 }
1713         },
1714         {1, 1, 3, 0,            /* 0xeb */
1715                 {{0, 1},
1716                 {3, 3},
1717                 {5, 7},
1718                 {0, 0}
1719                 }
1720         },
1721         {0, 1, 2, 0,            /* 0xec */
1722                 {{2, 3},
1723                 {5, 7},
1724                 {0, 0},
1725                 {0, 0}
1726                 }
1727         },
1728         {1, 1, 3, 0,            /* 0xed */
1729                 {{0, 0},
1730                 {2, 3},
1731                 {5, 7},
1732                 {0, 0}
1733                 }
1734         },
1735         {0, 1, 2, 0,            /* 0xee */
1736                 {{1, 3},
1737                 {5, 7},
1738                 {0, 0},
1739                 {0, 0}
1740                 }
1741         },
1742         {1, 1, 2, 0,            /* 0xef */
1743                 {{0, 3},
1744                 {5, 7},
1745                 {0, 0},
1746                 {0, 0}
1747                 }
1748         },
1749         {0, 1, 1, 0,            /* 0xf0 */
1750                 {{4, 7},
1751                 {0, 0},
1752                 {0, 0},
1753                 {0, 0}
1754                 }
1755         },
1756         {1, 1, 2, 0,            /* 0xf1 */
1757                 {{0, 0},
1758                 {4, 7},
1759                 {0, 0},
1760                 {0, 0}
1761                 }
1762         },
1763         {0, 1, 2, 0,            /* 0xf2 */
1764                 {{1, 1},
1765                 {4, 7},
1766                 {0, 0},
1767                 {0, 0}
1768                 }
1769         },
1770         {1, 1, 2, 0,            /* 0xf3 */
1771                 {{0, 1},
1772                 {4, 7},
1773                 {0, 0},
1774                 {0, 0}
1775                 }
1776         },
1777         {0, 1, 2, 0,            /* 0xf4 */
1778                 {{2, 2},
1779                 {4, 7},
1780                 {0, 0},
1781                 {0, 0}
1782                 }
1783         },
1784         {1, 1, 3, 0,            /* 0xf5 */
1785                 {{0, 0},
1786                 {2, 2},
1787                 {4, 7},
1788                 {0, 0}
1789                 }
1790         },
1791         {0, 1, 2, 0,            /* 0xf6 */
1792                 {{1, 2},
1793                 {4, 7},
1794                 {0, 0},
1795                 {0, 0}
1796                 }
1797         },
1798         {1, 1, 2, 0,            /* 0xf7 */
1799                 {{0, 2},
1800                 {4, 7},
1801                 {0, 0},
1802                 {0, 0}
1803                 }
1804         },
1805         {0, 1, 1, 0,            /* 0xf8 */
1806                 {{3, 7},
1807                 {0, 0},
1808                 {0, 0},
1809                 {0, 0}
1810                 }
1811         },
1812         {1, 1, 2, 0,            /* 0xf9 */
1813                 {{0, 0},
1814                 {3, 7},
1815                 {0, 0},
1816                 {0, 0}
1817                 }
1818         },
1819         {0, 1, 2, 0,            /* 0xfa */
1820                 {{1, 1},
1821                 {3, 7},
1822                 {0, 0},
1823                 {0, 0}
1824                 }
1825         },
1826         {1, 1, 2, 0,            /* 0xfb */
1827                 {{0, 1},
1828                 {3, 7},
1829                 {0, 0},
1830                 {0, 0}
1831                 }
1832         },
1833         {0, 1, 1, 0,            /* 0xfc */
1834                 {{2, 7},
1835                 {0, 0},
1836                 {0, 0},
1837                 {0, 0}
1838                 }
1839         },
1840         {1, 1, 2, 0,            /* 0xfd */
1841                 {{0, 0},
1842                 {2, 7},
1843                 {0, 0},
1844                 {0, 0}
1845                 }
1846         },
1847         {0, 1, 1, 0,            /* 0xfe */
1848                 {{1, 7},
1849                 {0, 0},
1850                 {0, 0},
1851                 {0, 0}
1852                 }
1853         },
1854         {1, 1, 1, 0,            /* 0xff */
1855                 {{0, 7},
1856                 {0, 0},
1857                 {0, 0},
1858                 {0, 0}
1859                 }
1860         }
1861 };
1862
1863
1864 int
1865 sctp_is_address_in_scope(struct sctp_ifa *ifa,
1866     int ipv4_addr_legal,
1867     int ipv6_addr_legal,
1868     int loopback_scope,
1869     int ipv4_local_scope,
1870     int local_scope SCTP_UNUSED,/* XXX */
1871     int site_scope,
1872     int do_update)
1873 {
1874         if ((loopback_scope == 0) &&
1875             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
1876                 /*
1877                  * skip loopback if not in scope *
1878                  */
1879                 return (0);
1880         }
1881         switch (ifa->address.sa.sa_family) {
1882 #ifdef INET
1883         case AF_INET:
1884                 if (ipv4_addr_legal) {
1885                         struct sockaddr_in *sin;
1886
1887                         sin = (struct sockaddr_in *)&ifa->address.sin;
1888                         if (sin->sin_addr.s_addr == 0) {
1889                                 /* not in scope , unspecified */
1890                                 return (0);
1891                         }
1892                         if ((ipv4_local_scope == 0) &&
1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
1894                                 /* private address not in scope */
1895                                 return (0);
1896                         }
1897                 } else {
1898                         return (0);
1899                 }
1900                 break;
1901 #endif
1902 #ifdef INET6
1903         case AF_INET6:
1904                 if (ipv6_addr_legal) {
1905                         struct sockaddr_in6 *sin6;
1906
1907                         /*
1908                          * Must update the flags,  bummer, which means any
1909                          * IFA locks must now be applied HERE <->
1910                          */
1911                         if (do_update) {
1912                                 sctp_gather_internal_ifa_flags(ifa);
1913                         }
1914                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
1915                                 return (0);
1916                         }
1917                         /* ok to use deprecated addresses? */
1918                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
1919                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1920                                 /* skip unspecifed addresses */
1921                                 return (0);
1922                         }
1923                         if (    /* (local_scope == 0) && */
1924                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
1925                                 return (0);
1926                         }
1927                         if ((site_scope == 0) &&
1928                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
1929                                 return (0);
1930                         }
1931                 } else {
1932                         return (0);
1933                 }
1934                 break;
1935 #endif
1936         default:
1937                 return (0);
1938         }
1939         return (1);
1940 }
1941
1942 static struct mbuf *
1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
1944 {
1945         struct sctp_paramhdr *parmh;
1946         struct mbuf *mret;
1947         int len;
1948
1949         switch (ifa->address.sa.sa_family) {
1950 #ifdef INET
1951         case AF_INET:
1952                 len = sizeof(struct sctp_ipv4addr_param);
1953                 break;
1954 #endif
1955 #ifdef INET6
1956         case AF_INET6:
1957                 len = sizeof(struct sctp_ipv6addr_param);
1958                 break;
1959 #endif
1960         default:
1961                 return (m);
1962         }
1963         if (M_TRAILINGSPACE(m) >= len) {
1964                 /* easy side we just drop it on the end */
1965                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
1966                 mret = m;
1967         } else {
1968                 /* Need more space */
1969                 mret = m;
1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
1971                         mret = SCTP_BUF_NEXT(mret);
1972                 }
1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
1975                         /* We are hosed, can't add more addresses */
1976                         return (m);
1977                 }
1978                 mret = SCTP_BUF_NEXT(mret);
1979                 parmh = mtod(mret, struct sctp_paramhdr *);
1980         }
1981         /* now add the parameter */
1982         switch (ifa->address.sa.sa_family) {
1983 #ifdef INET
1984         case AF_INET:
1985                 {
1986                         struct sctp_ipv4addr_param *ipv4p;
1987                         struct sockaddr_in *sin;
1988
1989                         sin = (struct sockaddr_in *)&ifa->address.sin;
1990                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
1991                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
1992                         parmh->param_length = htons(len);
1993                         ipv4p->addr = sin->sin_addr.s_addr;
1994                         SCTP_BUF_LEN(mret) += len;
1995                         break;
1996                 }
1997 #endif
1998 #ifdef INET6
1999         case AF_INET6:
2000                 {
2001                         struct sctp_ipv6addr_param *ipv6p;
2002                         struct sockaddr_in6 *sin6;
2003
2004                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
2005                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
2006                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
2007                         parmh->param_length = htons(len);
2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
2009                             sizeof(ipv6p->addr));
2010                         /* clear embedded scope in the address */
2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
2012                         SCTP_BUF_LEN(mret) += len;
2013                         break;
2014                 }
2015 #endif
2016         default:
2017                 return (m);
2018         }
2019         return (mret);
2020 }
2021
2022
2023 struct mbuf *
2024 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
2025     struct sctp_scoping *scope,
2026     struct mbuf *m_at, int cnt_inits_to)
2027 {
2028         struct sctp_vrf *vrf = NULL;
2029         int cnt, limit_out = 0, total_count;
2030         uint32_t vrf_id;
2031
2032         vrf_id = inp->def_vrf_id;
2033         SCTP_IPI_ADDR_RLOCK();
2034         vrf = sctp_find_vrf(vrf_id);
2035         if (vrf == NULL) {
2036                 SCTP_IPI_ADDR_RUNLOCK();
2037                 return (m_at);
2038         }
2039         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
2040                 struct sctp_ifa *sctp_ifap;
2041                 struct sctp_ifn *sctp_ifnp;
2042
2043                 cnt = cnt_inits_to;
2044                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
2045                         limit_out = 1;
2046                         cnt = SCTP_ADDRESS_LIMIT;
2047                         goto skip_count;
2048                 }
2049                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2050                         if ((scope->loopback_scope == 0) &&
2051                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2052                                 /*
2053                                  * Skip loopback devices if loopback_scope
2054                                  * not set
2055                                  */
2056                                 continue;
2057                         }
2058                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2059                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2060                                         continue;
2061                                 }
2062                                 if (sctp_is_address_in_scope(sctp_ifap,
2063                                     scope->ipv4_addr_legal,
2064                                     scope->ipv6_addr_legal,
2065                                     scope->loopback_scope,
2066                                     scope->ipv4_local_scope,
2067                                     scope->local_scope,
2068                                     scope->site_scope, 1) == 0) {
2069                                         continue;
2070                                 }
2071                                 cnt++;
2072                                 if (cnt > SCTP_ADDRESS_LIMIT) {
2073                                         break;
2074                                 }
2075                         }
2076                         if (cnt > SCTP_ADDRESS_LIMIT) {
2077                                 break;
2078                         }
2079                 }
2080 skip_count:
2081                 if (cnt > 1) {
2082                         total_count = 0;
2083                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
2084                                 cnt = 0;
2085                                 if ((scope->loopback_scope == 0) &&
2086                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
2087                                         /*
2088                                          * Skip loopback devices if
2089                                          * loopback_scope not set
2090                                          */
2091                                         continue;
2092                                 }
2093                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
2094                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
2095                                                 continue;
2096                                         }
2097                                         if (sctp_is_address_in_scope(sctp_ifap,
2098                                             scope->ipv4_addr_legal,
2099                                             scope->ipv6_addr_legal,
2100                                             scope->loopback_scope,
2101                                             scope->ipv4_local_scope,
2102                                             scope->local_scope,
2103                                             scope->site_scope, 0) == 0) {
2104                                                 continue;
2105                                         }
2106                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
2107                                         if (limit_out) {
2108                                                 cnt++;
2109                                                 total_count++;
2110                                                 if (cnt >= 2) {
2111                                                         /*
2112                                                          * two from each
2113                                                          * address
2114                                                          */
2115                                                         break;
2116                                                 }
2117                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
2118                                                         /* No more addresses */
2119                                                         break;
2120                                                 }
2121                                         }
2122                                 }
2123                         }
2124                 }
2125         } else {
2126                 struct sctp_laddr *laddr;
2127
2128                 cnt = cnt_inits_to;
2129                 /* First, how many ? */
2130                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2131                         if (laddr->ifa == NULL) {
2132                                 continue;
2133                         }
2134                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
2135                                 /*
2136                                  * Address being deleted by the system, dont
2137                                  * list.
2138                                  */
2139                                 continue;
2140                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2141                                 /*
2142                                  * Address being deleted on this ep don't
2143                                  * list.
2144                                  */
2145                                 continue;
2146                         }
2147                         if (sctp_is_address_in_scope(laddr->ifa,
2148                             scope->ipv4_addr_legal,
2149                             scope->ipv6_addr_legal,
2150                             scope->loopback_scope,
2151                             scope->ipv4_local_scope,
2152                             scope->local_scope,
2153                             scope->site_scope, 1) == 0) {
2154                                 continue;
2155                         }
2156                         cnt++;
2157                 }
2158                 /*
2159                  * To get through a NAT we only list addresses if we have
2160                  * more than one. That way if you just bind a single address
2161                  * we let the source of the init dictate our address.
2162                  */
2163                 if (cnt > 1) {
2164                         cnt = cnt_inits_to;
2165                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2166                                 if (laddr->ifa == NULL) {
2167                                         continue;
2168                                 }
2169                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
2170                                         continue;
2171                                 }
2172                                 if (sctp_is_address_in_scope(laddr->ifa,
2173                                     scope->ipv4_addr_legal,
2174                                     scope->ipv6_addr_legal,
2175                                     scope->loopback_scope,
2176                                     scope->ipv4_local_scope,
2177                                     scope->local_scope,
2178                                     scope->site_scope, 0) == 0) {
2179                                         continue;
2180                                 }
2181                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
2182                                 cnt++;
2183                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
2184                                         break;
2185                                 }
2186                         }
2187                 }
2188         }
2189         SCTP_IPI_ADDR_RUNLOCK();
2190         return (m_at);
2191 }
2192
2193 static struct sctp_ifa *
2194 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
2195     uint8_t dest_is_loop,
2196     uint8_t dest_is_priv,
2197     sa_family_t fam)
2198 {
2199         uint8_t dest_is_global = 0;
2200
2201         /* dest_is_priv is true if destination is a private address */
2202         /* dest_is_loop is true if destination is a loopback addresses */
2203
2204         /**
2205          * Here we determine if its a preferred address. A preferred address
2206          * means it is the same scope or higher scope then the destination.
2207          * L = loopback, P = private, G = global
2208          * -----------------------------------------
2209          *    src    |  dest | result
2210          *  ----------------------------------------
2211          *     L     |    L  |    yes
2212          *  -----------------------------------------
2213          *     P     |    L  |    yes-v4 no-v6
2214          *  -----------------------------------------
2215          *     G     |    L  |    yes-v4 no-v6
2216          *  -----------------------------------------
2217          *     L     |    P  |    no
2218          *  -----------------------------------------
2219          *     P     |    P  |    yes
2220          *  -----------------------------------------
2221          *     G     |    P  |    no
2222          *   -----------------------------------------
2223          *     L     |    G  |    no
2224          *   -----------------------------------------
2225          *     P     |    G  |    no
2226          *    -----------------------------------------
2227          *     G     |    G  |    yes
2228          *    -----------------------------------------
2229          */
2230
2231         if (ifa->address.sa.sa_family != fam) {
2232                 /* forget mis-matched family */
2233                 return (NULL);
2234         }
2235         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
2236                 dest_is_global = 1;
2237         }
2238         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
2239         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
2240         /* Ok the address may be ok */
2241 #ifdef INET6
2242         if (fam == AF_INET6) {
2243                 /* ok to use deprecated addresses? no lets not! */
2244                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2245                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
2246                         return (NULL);
2247                 }
2248                 if (ifa->src_is_priv && !ifa->src_is_loop) {
2249                         if (dest_is_loop) {
2250                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
2251                                 return (NULL);
2252                         }
2253                 }
2254                 if (ifa->src_is_glob) {
2255                         if (dest_is_loop) {
2256                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
2257                                 return (NULL);
2258                         }
2259                 }
2260         }
2261 #endif
2262         /*
2263          * Now that we know what is what, implement or table this could in
2264          * theory be done slicker (it used to be), but this is
2265          * straightforward and easier to validate :-)
2266          */
2267         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
2268             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
2269         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
2270             dest_is_loop, dest_is_priv, dest_is_global);
2271
2272         if ((ifa->src_is_loop) && (dest_is_priv)) {
2273                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
2274                 return (NULL);
2275         }
2276         if ((ifa->src_is_glob) && (dest_is_priv)) {
2277                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
2278                 return (NULL);
2279         }
2280         if ((ifa->src_is_loop) && (dest_is_global)) {
2281                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
2282                 return (NULL);
2283         }
2284         if ((ifa->src_is_priv) && (dest_is_global)) {
2285                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
2286                 return (NULL);
2287         }
2288         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
2289         /* its a preferred address */
2290         return (ifa);
2291 }
2292
2293 static struct sctp_ifa *
2294 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
2295     uint8_t dest_is_loop,
2296     uint8_t dest_is_priv,
2297     sa_family_t fam)
2298 {
2299         uint8_t dest_is_global = 0;
2300
2301         /**
2302          * Here we determine if its a acceptable address. A acceptable
2303          * address means it is the same scope or higher scope but we can
2304          * allow for NAT which means its ok to have a global dest and a
2305          * private src.
2306          *
2307          * L = loopback, P = private, G = global
2308          * -----------------------------------------
2309          *  src    |  dest | result
2310          * -----------------------------------------
2311          *   L     |   L   |    yes
2312          *  -----------------------------------------
2313          *   P     |   L   |    yes-v4 no-v6
2314          *  -----------------------------------------
2315          *   G     |   L   |    yes
2316          * -----------------------------------------
2317          *   L     |   P   |    no
2318          * -----------------------------------------
2319          *   P     |   P   |    yes
2320          * -----------------------------------------
2321          *   G     |   P   |    yes - May not work
2322          * -----------------------------------------
2323          *   L     |   G   |    no
2324          * -----------------------------------------
2325          *   P     |   G   |    yes - May not work
2326          * -----------------------------------------
2327          *   G     |   G   |    yes
2328          * -----------------------------------------
2329          */
2330
2331         if (ifa->address.sa.sa_family != fam) {
2332                 /* forget non matching family */
2333                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
2334                     ifa->address.sa.sa_family, fam);
2335                 return (NULL);
2336         }
2337         /* Ok the address may be ok */
2338         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
2339         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
2340             dest_is_loop, dest_is_priv);
2341         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
2342                 dest_is_global = 1;
2343         }
2344 #ifdef INET6
2345         if (fam == AF_INET6) {
2346                 /* ok to use deprecated addresses? */
2347                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
2348                         return (NULL);
2349                 }
2350                 if (ifa->src_is_priv) {
2351                         /* Special case, linklocal to loop */
2352                         if (dest_is_loop)
2353                                 return (NULL);
2354                 }
2355         }
2356 #endif
2357         /*
2358          * Now that we know what is what, implement our table. This could in
2359          * theory be done slicker (it used to be), but this is
2360          * straightforward and easier to validate :-)
2361          */
2362         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
2363             ifa->src_is_loop,
2364             dest_is_priv);
2365         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
2366                 return (NULL);
2367         }
2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
2369             ifa->src_is_loop,
2370             dest_is_global);
2371         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
2372                 return (NULL);
2373         }
2374         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
2375         /* its an acceptable address */
2376         return (ifa);
2377 }
2378
2379 int
2380 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
2381 {
2382         struct sctp_laddr *laddr;
2383
2384         if (stcb == NULL) {
2385                 /* There are no restrictions, no TCB :-) */
2386                 return (0);
2387         }
2388         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
2389                 if (laddr->ifa == NULL) {
2390                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2391                             __FUNCTION__);
2392                         continue;
2393                 }
2394                 if (laddr->ifa == ifa) {
2395                         /* Yes it is on the list */
2396                         return (1);
2397                 }
2398         }
2399         return (0);
2400 }
2401
2402
2403 int
2404 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
2405 {
2406         struct sctp_laddr *laddr;
2407
2408         if (ifa == NULL)
2409                 return (0);
2410         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
2411                 if (laddr->ifa == NULL) {
2412                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
2413                             __FUNCTION__);
2414                         continue;
2415                 }
2416                 if ((laddr->ifa == ifa) && laddr->action == 0)
2417                         /* same pointer */
2418                         return (1);
2419         }
2420         return (0);
2421 }
2422
2423
2424
2425 static struct sctp_ifa *
2426 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
2427     sctp_route_t * ro,
2428     uint32_t vrf_id,
2429     int non_asoc_addr_ok,
2430     uint8_t dest_is_priv,
2431     uint8_t dest_is_loop,
2432     sa_family_t fam)
2433 {
2434         struct sctp_laddr *laddr, *starting_point;
2435         void *ifn;
2436         int resettotop = 0;
2437         struct sctp_ifn *sctp_ifn;
2438         struct sctp_ifa *sctp_ifa, *sifa;
2439         struct sctp_vrf *vrf;
2440         uint32_t ifn_index;
2441
2442         vrf = sctp_find_vrf(vrf_id);
2443         if (vrf == NULL)
2444                 return (NULL);
2445
2446         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2447         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2448         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2449         /*
2450          * first question, is the ifn we will emit on in our list, if so, we
2451          * want such an address. Note that we first looked for a preferred
2452          * address.
2453          */
2454         if (sctp_ifn) {
2455                 /* is a preferred one on the interface we route out? */
2456                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2457                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2458                             (non_asoc_addr_ok == 0))
2459                                 continue;
2460                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
2461                             dest_is_loop,
2462                             dest_is_priv, fam);
2463                         if (sifa == NULL)
2464                                 continue;
2465                         if (sctp_is_addr_in_ep(inp, sifa)) {
2466                                 atomic_add_int(&sifa->refcount, 1);
2467                                 return (sifa);
2468                         }
2469                 }
2470         }
2471         /*
2472          * ok, now we now need to find one on the list of the addresses. We
2473          * can't get one on the emitting interface so let's find first a
2474          * preferred one. If not that an acceptable one otherwise... we
2475          * return NULL.
2476          */
2477         starting_point = inp->next_addr_touse;
2478 once_again:
2479         if (inp->next_addr_touse == NULL) {
2480                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2481                 resettotop = 1;
2482         }
2483         for (laddr = inp->next_addr_touse; laddr;
2484             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2485                 if (laddr->ifa == NULL) {
2486                         /* address has been removed */
2487                         continue;
2488                 }
2489                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2490                         /* address is being deleted */
2491                         continue;
2492                 }
2493                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
2494                     dest_is_priv, fam);
2495                 if (sifa == NULL)
2496                         continue;
2497                 atomic_add_int(&sifa->refcount, 1);
2498                 return (sifa);
2499         }
2500         if (resettotop == 0) {
2501                 inp->next_addr_touse = NULL;
2502                 goto once_again;
2503         }
2504         inp->next_addr_touse = starting_point;
2505         resettotop = 0;
2506 once_again_too:
2507         if (inp->next_addr_touse == NULL) {
2508                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
2509                 resettotop = 1;
2510         }
2511         /* ok, what about an acceptable address in the inp */
2512         for (laddr = inp->next_addr_touse; laddr;
2513             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2514                 if (laddr->ifa == NULL) {
2515                         /* address has been removed */
2516                         continue;
2517                 }
2518                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2519                         /* address is being deleted */
2520                         continue;
2521                 }
2522                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2523                     dest_is_priv, fam);
2524                 if (sifa == NULL)
2525                         continue;
2526                 atomic_add_int(&sifa->refcount, 1);
2527                 return (sifa);
2528         }
2529         if (resettotop == 0) {
2530                 inp->next_addr_touse = NULL;
2531                 goto once_again_too;
2532         }
2533         /*
2534          * no address bound can be a source for the destination we are in
2535          * trouble
2536          */
2537         return (NULL);
2538 }
2539
2540
2541
2542 static struct sctp_ifa *
2543 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
2544     struct sctp_tcb *stcb,
2545     sctp_route_t * ro,
2546     uint32_t vrf_id,
2547     uint8_t dest_is_priv,
2548     uint8_t dest_is_loop,
2549     int non_asoc_addr_ok,
2550     sa_family_t fam)
2551 {
2552         struct sctp_laddr *laddr, *starting_point;
2553         void *ifn;
2554         struct sctp_ifn *sctp_ifn;
2555         struct sctp_ifa *sctp_ifa, *sifa;
2556         uint8_t start_at_beginning = 0;
2557         struct sctp_vrf *vrf;
2558         uint32_t ifn_index;
2559
2560         /*
2561          * first question, is the ifn we will emit on in our list, if so, we
2562          * want that one.
2563          */
2564         vrf = sctp_find_vrf(vrf_id);
2565         if (vrf == NULL)
2566                 return (NULL);
2567
2568         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2569         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2570         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2571
2572         /*
2573          * first question, is the ifn we will emit on in our list?  If so,
2574          * we want that one. First we look for a preferred. Second, we go
2575          * for an acceptable.
2576          */
2577         if (sctp_ifn) {
2578                 /* first try for a preferred address on the ep */
2579                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2580                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2581                                 continue;
2582                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2583                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2584                                 if (sifa == NULL)
2585                                         continue;
2586                                 if (((non_asoc_addr_ok == 0) &&
2587                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2588                                     (non_asoc_addr_ok &&
2589                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2590                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2591                                         /* on the no-no list */
2592                                         continue;
2593                                 }
2594                                 atomic_add_int(&sifa->refcount, 1);
2595                                 return (sifa);
2596                         }
2597                 }
2598                 /* next try for an acceptable address on the ep */
2599                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
2600                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
2601                                 continue;
2602                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
2603                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
2604                                 if (sifa == NULL)
2605                                         continue;
2606                                 if (((non_asoc_addr_ok == 0) &&
2607                                     (sctp_is_addr_restricted(stcb, sifa))) ||
2608                                     (non_asoc_addr_ok &&
2609                                     (sctp_is_addr_restricted(stcb, sifa)) &&
2610                                     (!sctp_is_addr_pending(stcb, sifa)))) {
2611                                         /* on the no-no list */
2612                                         continue;
2613                                 }
2614                                 atomic_add_int(&sifa->refcount, 1);
2615                                 return (sifa);
2616                         }
2617                 }
2618
2619         }
2620         /*
2621          * if we can't find one like that then we must look at all addresses
2622          * bound to pick one at first preferable then secondly acceptable.
2623          */
2624         starting_point = stcb->asoc.last_used_address;
2625 sctp_from_the_top:
2626         if (stcb->asoc.last_used_address == NULL) {
2627                 start_at_beginning = 1;
2628                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2629         }
2630         /* search beginning with the last used address */
2631         for (laddr = stcb->asoc.last_used_address; laddr;
2632             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2633                 if (laddr->ifa == NULL) {
2634                         /* address has been removed */
2635                         continue;
2636                 }
2637                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2638                         /* address is being deleted */
2639                         continue;
2640                 }
2641                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
2642                 if (sifa == NULL)
2643                         continue;
2644                 if (((non_asoc_addr_ok == 0) &&
2645                     (sctp_is_addr_restricted(stcb, sifa))) ||
2646                     (non_asoc_addr_ok &&
2647                     (sctp_is_addr_restricted(stcb, sifa)) &&
2648                     (!sctp_is_addr_pending(stcb, sifa)))) {
2649                         /* on the no-no list */
2650                         continue;
2651                 }
2652                 stcb->asoc.last_used_address = laddr;
2653                 atomic_add_int(&sifa->refcount, 1);
2654                 return (sifa);
2655         }
2656         if (start_at_beginning == 0) {
2657                 stcb->asoc.last_used_address = NULL;
2658                 goto sctp_from_the_top;
2659         }
2660         /* now try for any higher scope than the destination */
2661         stcb->asoc.last_used_address = starting_point;
2662         start_at_beginning = 0;
2663 sctp_from_the_top2:
2664         if (stcb->asoc.last_used_address == NULL) {
2665                 start_at_beginning = 1;
2666                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
2667         }
2668         /* search beginning with the last used address */
2669         for (laddr = stcb->asoc.last_used_address; laddr;
2670             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
2671                 if (laddr->ifa == NULL) {
2672                         /* address has been removed */
2673                         continue;
2674                 }
2675                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
2676                         /* address is being deleted */
2677                         continue;
2678                 }
2679                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
2680                     dest_is_priv, fam);
2681                 if (sifa == NULL)
2682                         continue;
2683                 if (((non_asoc_addr_ok == 0) &&
2684                     (sctp_is_addr_restricted(stcb, sifa))) ||
2685                     (non_asoc_addr_ok &&
2686                     (sctp_is_addr_restricted(stcb, sifa)) &&
2687                     (!sctp_is_addr_pending(stcb, sifa)))) {
2688                         /* on the no-no list */
2689                         continue;
2690                 }
2691                 stcb->asoc.last_used_address = laddr;
2692                 atomic_add_int(&sifa->refcount, 1);
2693                 return (sifa);
2694         }
2695         if (start_at_beginning == 0) {
2696                 stcb->asoc.last_used_address = NULL;
2697                 goto sctp_from_the_top2;
2698         }
2699         return (NULL);
2700 }
2701
2702 static struct sctp_ifa *
2703 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
2704     struct sctp_tcb *stcb,
2705     int non_asoc_addr_ok,
2706     uint8_t dest_is_loop,
2707     uint8_t dest_is_priv,
2708     int addr_wanted,
2709     sa_family_t fam,
2710     sctp_route_t * ro
2711 )
2712 {
2713         struct sctp_ifa *ifa, *sifa;
2714         int num_eligible_addr = 0;
2715
2716 #ifdef INET6
2717         struct sockaddr_in6 sin6, lsa6;
2718
2719         if (fam == AF_INET6) {
2720                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
2721                 (void)sa6_recoverscope(&sin6);
2722         }
2723 #endif                          /* INET6 */
2724         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2725                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2726                     (non_asoc_addr_ok == 0))
2727                         continue;
2728                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2729                     dest_is_priv, fam);
2730                 if (sifa == NULL)
2731                         continue;
2732 #ifdef INET6
2733                 if (fam == AF_INET6 &&
2734                     dest_is_loop &&
2735                     sifa->src_is_loop && sifa->src_is_priv) {
2736                         /*
2737                          * don't allow fe80::1 to be a src on loop ::1, we
2738                          * don't list it to the peer so we will get an
2739                          * abort.
2740                          */
2741                         continue;
2742                 }
2743                 if (fam == AF_INET6 &&
2744                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
2745                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
2746                         /*
2747                          * link-local <-> link-local must belong to the same
2748                          * scope.
2749                          */
2750                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
2751                         (void)sa6_recoverscope(&lsa6);
2752                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
2753                                 continue;
2754                         }
2755                 }
2756 #endif                          /* INET6 */
2757
2758                 /*
2759                  * Check if the IPv6 address matches to next-hop. In the
2760                  * mobile case, old IPv6 address may be not deleted from the
2761                  * interface. Then, the interface has previous and new
2762                  * addresses.  We should use one corresponding to the
2763                  * next-hop.  (by micchie)
2764                  */
2765 #ifdef INET6
2766                 if (stcb && fam == AF_INET6 &&
2767                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2768                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
2769                             == 0) {
2770                                 continue;
2771                         }
2772                 }
2773 #endif
2774 #ifdef INET
2775                 /* Avoid topologically incorrect IPv4 address */
2776                 if (stcb && fam == AF_INET &&
2777                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
2778                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
2779                                 continue;
2780                         }
2781                 }
2782 #endif
2783                 if (stcb) {
2784                         if (sctp_is_address_in_scope(ifa,
2785                             stcb->asoc.ipv4_addr_legal,
2786                             stcb->asoc.ipv6_addr_legal,
2787                             stcb->asoc.loopback_scope,
2788                             stcb->asoc.ipv4_local_scope,
2789                             stcb->asoc.local_scope,
2790                             stcb->asoc.site_scope, 0) == 0) {
2791                                 continue;
2792                         }
2793                         if (((non_asoc_addr_ok == 0) &&
2794                             (sctp_is_addr_restricted(stcb, sifa))) ||
2795                             (non_asoc_addr_ok &&
2796                             (sctp_is_addr_restricted(stcb, sifa)) &&
2797                             (!sctp_is_addr_pending(stcb, sifa)))) {
2798                                 /*
2799                                  * It is restricted for some reason..
2800                                  * probably not yet added.
2801                                  */
2802                                 continue;
2803                         }
2804                 }
2805                 if (num_eligible_addr >= addr_wanted) {
2806                         return (sifa);
2807                 }
2808                 num_eligible_addr++;
2809         }
2810         return (NULL);
2811 }
2812
2813
2814 static int
2815 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
2816     struct sctp_tcb *stcb,
2817     int non_asoc_addr_ok,
2818     uint8_t dest_is_loop,
2819     uint8_t dest_is_priv,
2820     sa_family_t fam)
2821 {
2822         struct sctp_ifa *ifa, *sifa;
2823         int num_eligible_addr = 0;
2824
2825         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
2826                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
2827                     (non_asoc_addr_ok == 0)) {
2828                         continue;
2829                 }
2830                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
2831                     dest_is_priv, fam);
2832                 if (sifa == NULL) {
2833                         continue;
2834                 }
2835                 if (stcb) {
2836                         if (sctp_is_address_in_scope(ifa,
2837                             stcb->asoc.ipv4_addr_legal,
2838                             stcb->asoc.ipv6_addr_legal,
2839                             stcb->asoc.loopback_scope,
2840                             stcb->asoc.ipv4_local_scope,
2841                             stcb->asoc.local_scope,
2842                             stcb->asoc.site_scope, 0) == 0) {
2843                                 continue;
2844                         }
2845                         if (((non_asoc_addr_ok == 0) &&
2846                             (sctp_is_addr_restricted(stcb, sifa))) ||
2847                             (non_asoc_addr_ok &&
2848                             (sctp_is_addr_restricted(stcb, sifa)) &&
2849                             (!sctp_is_addr_pending(stcb, sifa)))) {
2850                                 /*
2851                                  * It is restricted for some reason..
2852                                  * probably not yet added.
2853                                  */
2854                                 continue;
2855                         }
2856                 }
2857                 num_eligible_addr++;
2858         }
2859         return (num_eligible_addr);
2860 }
2861
2862 static struct sctp_ifa *
2863 sctp_choose_boundall(struct sctp_tcb *stcb,
2864     struct sctp_nets *net,
2865     sctp_route_t * ro,
2866     uint32_t vrf_id,
2867     uint8_t dest_is_priv,
2868     uint8_t dest_is_loop,
2869     int non_asoc_addr_ok,
2870     sa_family_t fam)
2871 {
2872         int cur_addr_num = 0, num_preferred = 0;
2873         void *ifn;
2874         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
2875         struct sctp_ifa *sctp_ifa, *sifa;
2876         uint32_t ifn_index;
2877         struct sctp_vrf *vrf;
2878
2879 #ifdef INET
2880         int retried = 0;
2881
2882 #endif
2883
2884         /*-
2885          * For boundall we can use any address in the association.
2886          * If non_asoc_addr_ok is set we can use any address (at least in
2887          * theory). So we look for preferred addresses first. If we find one,
2888          * we use it. Otherwise we next try to get an address on the
2889          * interface, which we should be able to do (unless non_asoc_addr_ok
2890          * is false and we are routed out that way). In these cases where we
2891          * can't use the address of the interface we go through all the
2892          * ifn's looking for an address we can use and fill that in. Punting
2893          * means we send back address 0, which will probably cause problems
2894          * actually since then IP will fill in the address of the route ifn,
2895          * which means we probably already rejected it.. i.e. here comes an
2896          * abort :-<.
2897          */
2898         vrf = sctp_find_vrf(vrf_id);
2899         if (vrf == NULL)
2900                 return (NULL);
2901
2902         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
2903         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
2904         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
2905         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
2906         if (sctp_ifn == NULL) {
2907                 /* ?? We don't have this guy ?? */
2908                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
2909                 goto bound_all_plan_b;
2910         }
2911         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
2912             ifn_index, sctp_ifn->ifn_name);
2913
2914         if (net) {
2915                 cur_addr_num = net->indx_of_eligible_next_to_use;
2916         }
2917         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
2918             stcb,
2919             non_asoc_addr_ok,
2920             dest_is_loop,
2921             dest_is_priv, fam);
2922         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
2923             num_preferred, sctp_ifn->ifn_name);
2924         if (num_preferred == 0) {
2925                 /*
2926                  * no eligible addresses, we must use some other interface
2927                  * address if we can find one.
2928                  */
2929                 goto bound_all_plan_b;
2930         }
2931         /*
2932          * Ok we have num_eligible_addr set with how many we can use, this
2933          * may vary from call to call due to addresses being deprecated
2934          * etc..
2935          */
2936         if (cur_addr_num >= num_preferred) {
2937                 cur_addr_num = 0;
2938         }
2939         /*
2940          * select the nth address from the list (where cur_addr_num is the
2941          * nth) and 0 is the first one, 1 is the second one etc...
2942          */
2943         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
2944
2945         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2946             dest_is_priv, cur_addr_num, fam, ro);
2947
2948         /* if sctp_ifa is NULL something changed??, fall to plan b. */
2949         if (sctp_ifa) {
2950                 atomic_add_int(&sctp_ifa->refcount, 1);
2951                 if (net) {
2952                         /* save off where the next one we will want */
2953                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
2954                 }
2955                 return (sctp_ifa);
2956         }
2957         /*
2958          * plan_b: Look at all interfaces and find a preferred address. If
2959          * no preferred fall through to plan_c.
2960          */
2961 bound_all_plan_b:
2962         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
2963         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
2964                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
2965                     sctp_ifn->ifn_name);
2966                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
2967                         /* wrong base scope */
2968                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
2969                         continue;
2970                 }
2971                 if ((sctp_ifn == looked_at) && looked_at) {
2972                         /* already looked at this guy */
2973                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
2974                         continue;
2975                 }
2976                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
2977                     dest_is_loop, dest_is_priv, fam);
2978                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2979                     "Found ifn:%p %d preferred source addresses\n",
2980                     ifn, num_preferred);
2981                 if (num_preferred == 0) {
2982                         /* None on this interface. */
2983                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
2984                         continue;
2985                 }
2986                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
2987                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
2988                     num_preferred, sctp_ifn, cur_addr_num);
2989
2990                 /*
2991                  * Ok we have num_eligible_addr set with how many we can
2992                  * use, this may vary from call to call due to addresses
2993                  * being deprecated etc..
2994                  */
2995                 if (cur_addr_num >= num_preferred) {
2996                         cur_addr_num = 0;
2997                 }
2998                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
2999                     dest_is_priv, cur_addr_num, fam, ro);
3000                 if (sifa == NULL)
3001                         continue;
3002                 if (net) {
3003                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
3004                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
3005                             cur_addr_num);
3006                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
3007                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
3008                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
3009                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
3010                 }
3011                 atomic_add_int(&sifa->refcount, 1);
3012                 return (sifa);
3013         }
3014 #ifdef INET
3015 again_with_private_addresses_allowed:
3016 #endif
3017         /* plan_c: do we have an acceptable address on the emit interface */
3018         sifa = NULL;
3019         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
3020         if (emit_ifn == NULL) {
3021                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
3022                 goto plan_d;
3023         }
3024         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
3025                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", sctp_ifa);
3026                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3027                     (non_asoc_addr_ok == 0)) {
3028                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
3029                         continue;
3030                 }
3031                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
3032                     dest_is_priv, fam);
3033                 if (sifa == NULL) {
3034                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
3035                         continue;
3036                 }
3037                 if (stcb) {
3038                         if (sctp_is_address_in_scope(sifa,
3039                             stcb->asoc.ipv4_addr_legal,
3040                             stcb->asoc.ipv6_addr_legal,
3041                             stcb->asoc.loopback_scope,
3042                             stcb->asoc.ipv4_local_scope,
3043                             stcb->asoc.local_scope,
3044                             stcb->asoc.site_scope, 0) == 0) {
3045                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
3046                                 sifa = NULL;
3047                                 continue;
3048                         }
3049                         if (((non_asoc_addr_ok == 0) &&
3050                             (sctp_is_addr_restricted(stcb, sifa))) ||
3051                             (non_asoc_addr_ok &&
3052                             (sctp_is_addr_restricted(stcb, sifa)) &&
3053                             (!sctp_is_addr_pending(stcb, sifa)))) {
3054                                 /*
3055                                  * It is restricted for some reason..
3056                                  * probably not yet added.
3057                                  */
3058                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
3059                                 sifa = NULL;
3060                                 continue;
3061                         }
3062                 } else {
3063                         SCTP_PRINTF("Stcb is null - no print\n");
3064                 }
3065                 atomic_add_int(&sifa->refcount, 1);
3066                 goto out;
3067         }
3068 plan_d:
3069         /*
3070          * plan_d: We are in trouble. No preferred address on the emit
3071          * interface. And not even a preferred address on all interfaces. Go
3072          * out and see if we can find an acceptable address somewhere
3073          * amongst all interfaces.
3074          */
3075         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", looked_at);
3076         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3077                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3078                         /* wrong base scope */
3079                         continue;
3080                 }
3081                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3082                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3083                             (non_asoc_addr_ok == 0))
3084                                 continue;
3085                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3086                             dest_is_loop,
3087                             dest_is_priv, fam);
3088                         if (sifa == NULL)
3089                                 continue;
3090                         if (stcb) {
3091                                 if (sctp_is_address_in_scope(sifa,
3092                                     stcb->asoc.ipv4_addr_legal,
3093                                     stcb->asoc.ipv6_addr_legal,
3094                                     stcb->asoc.loopback_scope,
3095                                     stcb->asoc.ipv4_local_scope,
3096                                     stcb->asoc.local_scope,
3097                                     stcb->asoc.site_scope, 0) == 0) {
3098                                         sifa = NULL;
3099                                         continue;
3100                                 }
3101                                 if (((non_asoc_addr_ok == 0) &&
3102                                     (sctp_is_addr_restricted(stcb, sifa))) ||
3103                                     (non_asoc_addr_ok &&
3104                                     (sctp_is_addr_restricted(stcb, sifa)) &&
3105                                     (!sctp_is_addr_pending(stcb, sifa)))) {
3106                                         /*
3107                                          * It is restricted for some
3108                                          * reason.. probably not yet added.
3109                                          */
3110                                         sifa = NULL;
3111                                         continue;
3112                                 }
3113                         }
3114                         goto out;
3115                 }
3116         }
3117 #ifdef INET
3118         if ((retried == 0) && (stcb->asoc.ipv4_local_scope == 0)) {
3119                 stcb->asoc.ipv4_local_scope = 1;
3120                 retried = 1;
3121                 goto again_with_private_addresses_allowed;
3122         } else if (retried == 1) {
3123                 stcb->asoc.ipv4_local_scope = 0;
3124         }
3125 #endif
3126 out:
3127 #ifdef INET
3128         if (sifa) {
3129                 if (retried == 1) {
3130                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
3131                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
3132                                         /* wrong base scope */
3133                                         continue;
3134                                 }
3135                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
3136                                         struct sctp_ifa *tmp_sifa;
3137
3138                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
3139                                             (non_asoc_addr_ok == 0))
3140                                                 continue;
3141                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
3142                                             dest_is_loop,
3143                                             dest_is_priv, fam);
3144                                         if (tmp_sifa == NULL) {
3145                                                 continue;
3146                                         }
3147                                         if (tmp_sifa == sifa) {
3148                                                 continue;
3149                                         }
3150                                         if (stcb) {
3151                                                 if (sctp_is_address_in_scope(tmp_sifa,
3152                                                     stcb->asoc.ipv4_addr_legal,
3153                                                     stcb->asoc.ipv6_addr_legal,
3154                                                     stcb->asoc.loopback_scope,
3155                                                     stcb->asoc.ipv4_local_scope,
3156                                                     stcb->asoc.local_scope,
3157                                                     stcb->asoc.site_scope, 0) == 0) {
3158                                                         continue;
3159                                                 }
3160                                                 if (((non_asoc_addr_ok == 0) &&
3161                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
3162                                                     (non_asoc_addr_ok &&
3163                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
3164                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
3165                                                         /*
3166                                                          * It is restricted
3167                                                          * for some reason..
3168                                                          * probably not yet
3169                                                          * added.
3170                                                          */
3171                                                         continue;
3172                                                 }
3173                                         }
3174                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
3175                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
3176                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
3177                                         }
3178                                 }
3179                         }
3180                 }
3181                 atomic_add_int(&sifa->refcount, 1);
3182         }
3183 #endif
3184         return (sifa);
3185 }
3186
3187
3188
3189 /* tcb may be NULL */
3190 struct sctp_ifa *
3191 sctp_source_address_selection(struct sctp_inpcb *inp,
3192     struct sctp_tcb *stcb,
3193     sctp_route_t * ro,
3194     struct sctp_nets *net,
3195     int non_asoc_addr_ok, uint32_t vrf_id)
3196 {
3197         struct sctp_ifa *answer;
3198         uint8_t dest_is_priv, dest_is_loop;
3199         sa_family_t fam;
3200
3201 #ifdef INET
3202         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
3203
3204 #endif
3205 #ifdef INET6
3206         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
3207
3208 #endif
3209
3210         /**
3211          * Rules: - Find the route if needed, cache if I can. - Look at
3212          * interface address in route, Is it in the bound list. If so we
3213          * have the best source. - If not we must rotate amongst the
3214          * addresses.
3215          *
3216          * Cavets and issues
3217          *
3218          * Do we need to pay attention to scope. We can have a private address
3219          * or a global address we are sourcing or sending to. So if we draw
3220          * it out
3221          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3222          * For V4
3223          * ------------------------------------------
3224          *      source     *      dest  *  result
3225          * -----------------------------------------
3226          * <a>  Private    *    Global  *  NAT
3227          * -----------------------------------------
3228          * <b>  Private    *    Private *  No problem
3229          * -----------------------------------------
3230          * <c>  Global     *    Private *  Huh, How will this work?
3231          * -----------------------------------------
3232          * <d>  Global     *    Global  *  No Problem
3233          *------------------------------------------
3234          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3235          * For V6
3236          *------------------------------------------
3237          *      source     *      dest  *  result
3238          * -----------------------------------------
3239          * <a>  Linklocal  *    Global  *
3240          * -----------------------------------------
3241          * <b>  Linklocal  * Linklocal  *  No problem
3242          * -----------------------------------------
3243          * <c>  Global     * Linklocal  *  Huh, How will this work?
3244          * -----------------------------------------
3245          * <d>  Global     *    Global  *  No Problem
3246          *------------------------------------------
3247          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
3248          *
3249          * And then we add to that what happens if there are multiple addresses
3250          * assigned to an interface. Remember the ifa on a ifn is a linked
3251          * list of addresses. So one interface can have more than one IP
3252          * address. What happens if we have both a private and a global
3253          * address? Do we then use context of destination to sort out which
3254          * one is best? And what about NAT's sending P->G may get you a NAT
3255          * translation, or should you select the G thats on the interface in
3256          * preference.
3257          *
3258          * Decisions:
3259          *
3260          * - count the number of addresses on the interface.
3261          * - if it is one, no problem except case <c>.
3262          *   For <a> we will assume a NAT out there.
3263          * - if there are more than one, then we need to worry about scope P
3264          *   or G. We should prefer G -> G and P -> P if possible.
3265          *   Then as a secondary fall back to mixed types G->P being a last
3266          *   ditch one.
3267          * - The above all works for bound all, but bound specific we need to
3268          *   use the same concept but instead only consider the bound
3269          *   addresses. If the bound set is NOT assigned to the interface then
3270          *   we must use rotation amongst the bound addresses..
3271          */
3272         if (ro->ro_rt == NULL) {
3273                 /*
3274                  * Need a route to cache.
3275                  */
3276                 SCTP_RTALLOC(ro, vrf_id);
3277         }
3278         if (ro->ro_rt == NULL) {
3279                 return (NULL);
3280         }
3281         fam = ro->ro_dst.sa_family;
3282         dest_is_priv = dest_is_loop = 0;
3283         /* Setup our scopes for the destination */
3284         switch (fam) {
3285 #ifdef INET
3286         case AF_INET:
3287                 /* Scope based on outbound address */
3288                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
3289                         dest_is_loop = 1;
3290                         if (net != NULL) {
3291                                 /* mark it as local */
3292                                 net->addr_is_local = 1;
3293                         }
3294                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
3295                         dest_is_priv = 1;
3296                 }
3297                 break;
3298 #endif
3299 #ifdef INET6
3300         case AF_INET6:
3301                 /* Scope based on outbound address */
3302                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
3303                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
3304                         /*
3305                          * If the address is a loopback address, which
3306                          * consists of "::1" OR "fe80::1%lo0", we are
3307                          * loopback scope. But we don't use dest_is_priv
3308                          * (link local addresses).
3309                          */
3310                         dest_is_loop = 1;
3311                         if (net != NULL) {
3312                                 /* mark it as local */
3313                                 net->addr_is_local = 1;
3314                         }
3315                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
3316                         dest_is_priv = 1;
3317                 }
3318                 break;
3319 #endif
3320         }
3321         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
3322         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
3323         SCTP_IPI_ADDR_RLOCK();
3324         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
3325                 /*
3326                  * Bound all case
3327                  */
3328                 answer = sctp_choose_boundall(stcb, net, ro, vrf_id,
3329                     dest_is_priv, dest_is_loop,
3330                     non_asoc_addr_ok, fam);
3331                 SCTP_IPI_ADDR_RUNLOCK();
3332                 return (answer);
3333         }
3334         /*
3335          * Subset bound case
3336          */
3337         if (stcb) {
3338                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
3339                     vrf_id, dest_is_priv,
3340                     dest_is_loop,
3341                     non_asoc_addr_ok, fam);
3342         } else {
3343                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
3344                     non_asoc_addr_ok,
3345                     dest_is_priv,
3346                     dest_is_loop, fam);
3347         }
3348         SCTP_IPI_ADDR_RUNLOCK();
3349         return (answer);
3350 }
3351
3352 static int
3353 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
3354 {
3355         struct cmsghdr cmh;
3356         int tlen, at, found;
3357         struct sctp_sndinfo sndinfo;
3358         struct sctp_prinfo prinfo;
3359         struct sctp_authinfo authinfo;
3360
3361         tlen = SCTP_BUF_LEN(control);
3362         at = 0;
3363         found = 0;
3364         /*
3365          * Independent of how many mbufs, find the c_type inside the control
3366          * structure and copy out the data.
3367          */
3368         while (at < tlen) {
3369                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3370                         /* There is not enough room for one more. */
3371                         return (found);
3372                 }
3373                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3374                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3375                         /* We dont't have a complete CMSG header. */
3376                         return (found);
3377                 }
3378                 if (((int)cmh.cmsg_len + at) > tlen) {
3379                         /* We don't have the complete CMSG. */
3380                         return (found);
3381                 }
3382                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
3383                     ((c_type == cmh.cmsg_type) ||
3384                     ((c_type == SCTP_SNDRCV) &&
3385                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
3386                     (cmh.cmsg_type == SCTP_PRINFO) ||
3387                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
3388                         if (c_type == cmh.cmsg_type) {
3389                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
3390                                         return (found);
3391                                 }
3392                                 /* It is exactly what we want. Copy it out. */
3393                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), cpsize, (caddr_t)data);
3394                                 return (1);
3395                         } else {
3396                                 struct sctp_sndrcvinfo *sndrcvinfo;
3397
3398                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
3399                                 if (found == 0) {
3400                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
3401                                                 return (found);
3402                                         }
3403                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
3404                                 }
3405                                 switch (cmh.cmsg_type) {
3406                                 case SCTP_SNDINFO:
3407                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_sndinfo)) {
3408                                                 return (found);
3409                                         }
3410                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
3411                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
3412                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
3413                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
3414                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
3415                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
3416                                         break;
3417                                 case SCTP_PRINFO:
3418                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_prinfo)) {
3419                                                 return (found);
3420                                         }
3421                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
3422                                         sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
3423                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
3424                                         break;
3425                                 case SCTP_AUTHINFO:
3426                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_authinfo)) {
3427                                                 return (found);
3428                                         }
3429                                         m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
3430                                         sndrcvinfo->sinfo_keynumber_valid = 1;
3431                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
3432                                         break;
3433                                 default:
3434                                         return (found);
3435                                 }
3436                                 found = 1;
3437                         }
3438                 }
3439                 at += CMSG_ALIGN(cmh.cmsg_len);
3440         }
3441         return (found);
3442 }
3443
3444 static int
3445 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
3446 {
3447         struct cmsghdr cmh;
3448         int tlen, at;
3449         struct sctp_initmsg initmsg;
3450
3451 #ifdef INET
3452         struct sockaddr_in sin;
3453
3454 #endif
3455 #ifdef INET6
3456         struct sockaddr_in6 sin6;
3457
3458 #endif
3459
3460         tlen = SCTP_BUF_LEN(control);
3461         at = 0;
3462         while (at < tlen) {
3463                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3464                         /* There is not enough room for one more. */
3465                         *error = EINVAL;
3466                         return (1);
3467                 }
3468                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3469                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3470                         /* We dont't have a complete CMSG header. */
3471                         *error = EINVAL;
3472                         return (1);
3473                 }
3474                 if (((int)cmh.cmsg_len + at) > tlen) {
3475                         /* We don't have the complete CMSG. */
3476                         *error = EINVAL;
3477                         return (1);
3478                 }
3479                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3480                         switch (cmh.cmsg_type) {
3481                         case SCTP_INIT:
3482                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct sctp_initmsg)) {
3483                                         *error = EINVAL;
3484                                         return (1);
3485                                 }
3486                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
3487                                 if (initmsg.sinit_max_attempts)
3488                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
3489                                 if (initmsg.sinit_num_ostreams)
3490                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
3491                                 if (initmsg.sinit_max_instreams)
3492                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
3493                                 if (initmsg.sinit_max_init_timeo)
3494                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
3495                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
3496                                         struct sctp_stream_out *tmp_str;
3497                                         unsigned int i;
3498
3499                                         /* Default is NOT correct */
3500                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
3501                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
3502                                         SCTP_TCB_UNLOCK(stcb);
3503                                         SCTP_MALLOC(tmp_str,
3504                                             struct sctp_stream_out *,
3505                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
3506                                             SCTP_M_STRMO);
3507                                         SCTP_TCB_LOCK(stcb);
3508                                         if (tmp_str != NULL) {
3509                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
3510                                                 stcb->asoc.strmout = tmp_str;
3511                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
3512                                         } else {
3513                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
3514                                         }
3515                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3516                                                 stcb->asoc.strmout[i].next_sequence_sent = 0;
3517                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
3518                                                 stcb->asoc.strmout[i].stream_no = i;
3519                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
3520                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
3521                                         }
3522                                 }
3523                                 break;
3524 #ifdef INET
3525                         case SCTP_DSTADDRV4:
3526                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3527                                         *error = EINVAL;
3528                                         return (1);
3529                                 }
3530                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3531                                 sin.sin_family = AF_INET;
3532                                 sin.sin_len = sizeof(struct sockaddr_in);
3533                                 sin.sin_port = stcb->rport;
3534                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3535                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3536                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3537                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3538                                         *error = EINVAL;
3539                                         return (1);
3540                                 }
3541                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3542                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3543                                         *error = ENOBUFS;
3544                                         return (1);
3545                                 }
3546                                 break;
3547 #endif
3548 #ifdef INET6
3549                         case SCTP_DSTADDRV6:
3550                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3551                                         *error = EINVAL;
3552                                         return (1);
3553                                 }
3554                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3555                                 sin6.sin6_family = AF_INET6;
3556                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3557                                 sin6.sin6_port = stcb->rport;
3558                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3559                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
3560                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
3561                                         *error = EINVAL;
3562                                         return (1);
3563                                 }
3564 #ifdef INET
3565                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3566                                         in6_sin6_2_sin(&sin, &sin6);
3567                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
3568                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
3569                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
3570                                                 *error = EINVAL;
3571                                                 return (1);
3572                                         }
3573                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
3574                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3575                                                 *error = ENOBUFS;
3576                                                 return (1);
3577                                         }
3578                                 } else
3579 #endif
3580                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
3581                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
3582                                         *error = ENOBUFS;
3583                                         return (1);
3584                                 }
3585                                 break;
3586 #endif
3587                         default:
3588                                 break;
3589                         }
3590                 }
3591                 at += CMSG_ALIGN(cmh.cmsg_len);
3592         }
3593         return (0);
3594 }
3595
3596 static struct sctp_tcb *
3597 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
3598     in_port_t port,
3599     struct mbuf *control,
3600     struct sctp_nets **net_p,
3601     int *error)
3602 {
3603         struct cmsghdr cmh;
3604         int tlen, at;
3605         struct sctp_tcb *stcb;
3606         struct sockaddr *addr;
3607
3608 #ifdef INET
3609         struct sockaddr_in sin;
3610
3611 #endif
3612 #ifdef INET6
3613         struct sockaddr_in6 sin6;
3614
3615 #endif
3616
3617         tlen = SCTP_BUF_LEN(control);
3618         at = 0;
3619         while (at < tlen) {
3620                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
3621                         /* There is not enough room for one more. */
3622                         *error = EINVAL;
3623                         return (NULL);
3624                 }
3625                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
3626                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(struct cmsghdr))) {
3627                         /* We dont't have a complete CMSG header. */
3628                         *error = EINVAL;
3629                         return (NULL);
3630                 }
3631                 if (((int)cmh.cmsg_len + at) > tlen) {
3632                         /* We don't have the complete CMSG. */
3633                         *error = EINVAL;
3634                         return (NULL);
3635                 }
3636                 if (cmh.cmsg_level == IPPROTO_SCTP) {
3637                         switch (cmh.cmsg_type) {
3638 #ifdef INET
3639                         case SCTP_DSTADDRV4:
3640                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in_addr)) {
3641                                         *error = EINVAL;
3642                                         return (NULL);
3643                                 }
3644                                 memset(&sin, 0, sizeof(struct sockaddr_in));
3645                                 sin.sin_family = AF_INET;
3646                                 sin.sin_len = sizeof(struct sockaddr_in);
3647                                 sin.sin_port = port;
3648                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
3649                                 addr = (struct sockaddr *)&sin;
3650                                 break;
3651 #endif
3652 #ifdef INET6
3653                         case SCTP_DSTADDRV6:
3654                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < sizeof(struct in6_addr)) {
3655                                         *error = EINVAL;
3656                                         return (NULL);
3657                                 }
3658                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
3659                                 sin6.sin6_family = AF_INET6;
3660                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
3661                                 sin6.sin6_port = port;
3662                                 m_copydata(control, at + CMSG_ALIGN(sizeof(struct cmsghdr)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
3663 #ifdef INET
3664                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
3665                                         in6_sin6_2_sin(&sin, &sin6);
3666                                         addr = (struct sockaddr *)&sin;
3667                                 } else
3668 #endif
3669                                         addr = (struct sockaddr *)&sin6;
3670                                 break;
3671 #endif
3672                         default:
3673                                 addr = NULL;
3674                                 break;
3675                         }
3676                         if (addr) {
3677                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
3678                                 if (stcb != NULL) {
3679                                         return (stcb);
3680                                 }
3681                         }
3682                 }
3683                 at += CMSG_ALIGN(cmh.cmsg_len);
3684         }
3685         return (NULL);
3686 }
3687
3688 static struct mbuf *
3689 sctp_add_cookie(struct mbuf *init, int init_offset,
3690     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
3691 {
3692         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
3693         struct sctp_state_cookie *stc;
3694         struct sctp_paramhdr *ph;
3695         uint8_t *foo;
3696         int sig_offset;
3697         uint16_t cookie_sz;
3698
3699         mret = NULL;
3700         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
3701             sizeof(struct sctp_paramhdr)), 0,
3702             M_DONTWAIT, 1, MT_DATA);
3703         if (mret == NULL) {
3704                 return (NULL);
3705         }
3706         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
3707         if (copy_init == NULL) {
3708                 sctp_m_freem(mret);
3709                 return (NULL);
3710         }
3711 #ifdef SCTP_MBUF_LOGGING
3712         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3713                 struct mbuf *mat;
3714
3715                 for (mat = copy_init; mat; mat = SCTP_BUF_NEXT(mat)) {
3716                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3717                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3718                         }
3719                 }
3720         }
3721 #endif
3722         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
3723             M_DONTWAIT);
3724         if (copy_initack == NULL) {
3725                 sctp_m_freem(mret);
3726                 sctp_m_freem(copy_init);
3727                 return (NULL);
3728         }
3729 #ifdef SCTP_MBUF_LOGGING
3730         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
3731                 struct mbuf *mat;
3732
3733                 for (mat = copy_initack; mat; mat = SCTP_BUF_NEXT(mat)) {
3734                         if (SCTP_BUF_IS_EXTENDED(mat)) {
3735                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
3736                         }
3737                 }
3738         }
3739 #endif
3740         /* easy side we just drop it on the end */
3741         ph = mtod(mret, struct sctp_paramhdr *);
3742         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
3743             sizeof(struct sctp_paramhdr);
3744         stc = (struct sctp_state_cookie *)((caddr_t)ph +
3745             sizeof(struct sctp_paramhdr));
3746         ph->param_type = htons(SCTP_STATE_COOKIE);
3747         ph->param_length = 0;   /* fill in at the end */
3748         /* Fill in the stc cookie data */
3749         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
3750
3751         /* tack the INIT and then the INIT-ACK onto the chain */
3752         cookie_sz = 0;
3753         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3754                 cookie_sz += SCTP_BUF_LEN(m_at);
3755                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3756                         SCTP_BUF_NEXT(m_at) = copy_init;
3757                         break;
3758                 }
3759         }
3760         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3761                 cookie_sz += SCTP_BUF_LEN(m_at);
3762                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3763                         SCTP_BUF_NEXT(m_at) = copy_initack;
3764                         break;
3765                 }
3766         }
3767         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
3768                 cookie_sz += SCTP_BUF_LEN(m_at);
3769                 if (SCTP_BUF_NEXT(m_at) == NULL) {
3770                         break;
3771                 }
3772         }
3773         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
3774         if (sig == NULL) {
3775                 /* no space, so free the entire chain */
3776                 sctp_m_freem(mret);
3777                 return (NULL);
3778         }
3779         SCTP_BUF_LEN(sig) = 0;
3780         SCTP_BUF_NEXT(m_at) = sig;
3781         sig_offset = 0;
3782         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
3783         memset(foo, 0, SCTP_SIGNATURE_SIZE);
3784         *signature = foo;
3785         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
3786         cookie_sz += SCTP_SIGNATURE_SIZE;
3787         ph->param_length = htons(cookie_sz);
3788         return (mret);
3789 }
3790
3791
3792 static uint8_t
3793 sctp_get_ect(struct sctp_tcb *stcb)
3794 {
3795         if ((stcb != NULL) && (stcb->asoc.ecn_allowed == 1)) {
3796                 return (SCTP_ECT0_BIT);
3797         } else {
3798                 return (0);
3799         }
3800 }
3801
3802 #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", 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                             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                                 if (ro->ro_rt) {
4167                                         RTFREE(ro->ro_rt);
4168                                         ro->ro_rt = NULL;
4169                                 }
4170                         } else {
4171                                 /*
4172                                  * PMTU check versus smallest asoc MTU goes
4173                                  * here
4174                                  */
4175                                 if ((ro->ro_rt != NULL) &&
4176                                     (net->ro._s_addr)) {
4177                                         uint32_t mtu;
4178
4179                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4180                                         if (net->port) {
4181                                                 mtu -= sizeof(struct udphdr);
4182                                         }
4183                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4184                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4185                                                 net->mtu = mtu;
4186                                         }
4187                                 } else if (ro->ro_rt == NULL) {
4188                                         /* route was freed */
4189                                         if (net->ro._s_addr &&
4190                                             net->src_addr_selected) {
4191                                                 sctp_free_ifa(net->ro._s_addr);
4192                                                 net->ro._s_addr = NULL;
4193                                         }
4194                                         net->src_addr_selected = 0;
4195                                 }
4196                         }
4197                         return (ret);
4198                 }
4199 #endif
4200 #ifdef INET6
4201         case AF_INET6:
4202                 {
4203                         uint32_t flowlabel, flowinfo;
4204                         struct ip6_hdr *ip6h;
4205                         struct route_in6 ip6route;
4206                         struct ifnet *ifp;
4207                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4208                         int prev_scope = 0;
4209                         struct sockaddr_in6 lsa6_storage;
4210                         int error;
4211                         u_short prev_port = 0;
4212                         int len;
4213
4214                         if (net) {
4215                                 flowlabel = net->flowlabel;
4216                         } else if (stcb) {
4217                                 flowlabel = stcb->asoc.default_flowlabel;
4218                         } else {
4219                                 flowlabel = inp->sctp_ep.default_flowlabel;
4220                         }
4221                         if (flowlabel == 0) {
4222                                 /*
4223                                  * This means especially, that it is not set
4224                                  * at the SCTP layer. So use the value from
4225                                  * the IP layer.
4226                                  */
4227                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4228                         }
4229                         flowlabel &= 0x000fffff;
4230                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4231                         if (port) {
4232                                 len += sizeof(struct udphdr);
4233                         }
4234                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4235                         if (newm == NULL) {
4236                                 sctp_m_freem(m);
4237                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4238                                 return (ENOMEM);
4239                         }
4240                         SCTP_ALIGN_TO_END(newm, len);
4241                         SCTP_BUF_LEN(newm) = len;
4242                         SCTP_BUF_NEXT(newm) = m;
4243                         m = newm;
4244                         if (net != NULL) {
4245 #ifdef INVARIANTS
4246                                 if (net->flowidset == 0) {
4247                                         panic("Flow ID not set");
4248                                 }
4249 #endif
4250                                 m->m_pkthdr.flowid = net->flowid;
4251                                 m->m_flags |= M_FLOWID;
4252                         } else {
4253                                 if (use_mflowid != 0) {
4254                                         m->m_pkthdr.flowid = mflowid;
4255                                         m->m_flags |= M_FLOWID;
4256                                 }
4257                         }
4258                         packet_length = sctp_calculate_len(m);
4259
4260                         ip6h = mtod(m, struct ip6_hdr *);
4261                         /* protect *sin6 from overwrite */
4262                         sin6 = (struct sockaddr_in6 *)to;
4263                         tmp = *sin6;
4264                         sin6 = &tmp;
4265
4266                         /* KAME hack: embed scopeid */
4267                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4268                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4269                                 return (EINVAL);
4270                         }
4271                         if (net == NULL) {
4272                                 memset(&ip6route, 0, sizeof(ip6route));
4273                                 ro = (sctp_route_t *) & ip6route;
4274                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4275                         } else {
4276                                 ro = (sctp_route_t *) & net->ro;
4277                         }
4278                         /*
4279                          * We assume here that inp_flow is in host byte
4280                          * order within the TCB!
4281                          */
4282                         if (tos_value == 0) {
4283                                 /*
4284                                  * This means especially, that it is not set
4285                                  * at the SCTP layer. So use the value from
4286                                  * the IP layer.
4287                                  */
4288                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4289                         }
4290                         tos_value &= 0xfc;
4291                         if (ecn_ok) {
4292                                 tos_value |= sctp_get_ect(stcb);
4293                         }
4294                         flowinfo = 0x06;
4295                         flowinfo <<= 8;
4296                         flowinfo |= tos_value;
4297                         flowinfo <<= 20;
4298                         flowinfo |= flowlabel;
4299                         ip6h->ip6_flow = htonl(flowinfo);
4300                         if (port) {
4301                                 ip6h->ip6_nxt = IPPROTO_UDP;
4302                         } else {
4303                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4304                         }
4305                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4306                         ip6h->ip6_dst = sin6->sin6_addr;
4307
4308                         /*
4309                          * Add SRC address selection here: we can only reuse
4310                          * to a limited degree the kame src-addr-sel, since
4311                          * we can try their selection but it may not be
4312                          * bound.
4313                          */
4314                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4315                         lsa6_tmp.sin6_family = AF_INET6;
4316                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4317                         lsa6 = &lsa6_tmp;
4318                         if (net && out_of_asoc_ok == 0) {
4319                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4320                                         sctp_free_ifa(net->ro._s_addr);
4321                                         net->ro._s_addr = NULL;
4322                                         net->src_addr_selected = 0;
4323                                         if (ro->ro_rt) {
4324                                                 RTFREE(ro->ro_rt);
4325                                                 ro->ro_rt = NULL;
4326                                         }
4327                                 }
4328                                 if (net->src_addr_selected == 0) {
4329                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4330                                         /* KAME hack: embed scopeid */
4331                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4332                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4333                                                 return (EINVAL);
4334                                         }
4335                                         /* Cache the source address */
4336                                         net->ro._s_addr = sctp_source_address_selection(inp,
4337                                             stcb,
4338                                             ro,
4339                                             net,
4340                                             0,
4341                                             vrf_id);
4342                                         (void)sa6_recoverscope(sin6);
4343                                         net->src_addr_selected = 1;
4344                                 }
4345                                 if (net->ro._s_addr == NULL) {
4346                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4347                                         net->src_addr_selected = 0;
4348                                         sctp_handle_no_route(stcb, net, so_locked);
4349                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4350                                         sctp_m_freem(m);
4351                                         return (EHOSTUNREACH);
4352                                 }
4353                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4354                         } else {
4355                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4356                                 /* KAME hack: embed scopeid */
4357                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4358                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4359                                         return (EINVAL);
4360                                 }
4361                                 if (over_addr == NULL) {
4362                                         struct sctp_ifa *_lsrc;
4363
4364                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4365                                             net,
4366                                             out_of_asoc_ok,
4367                                             vrf_id);
4368                                         if (_lsrc == NULL) {
4369                                                 sctp_handle_no_route(stcb, net, so_locked);
4370                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4371                                                 sctp_m_freem(m);
4372                                                 return (EHOSTUNREACH);
4373                                         }
4374                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4375                                         sctp_free_ifa(_lsrc);
4376                                 } else {
4377                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4378                                         SCTP_RTALLOC(ro, vrf_id);
4379                                 }
4380                                 (void)sa6_recoverscope(sin6);
4381                         }
4382                         lsa6->sin6_port = inp->sctp_lport;
4383
4384                         if (ro->ro_rt == NULL) {
4385                                 /*
4386                                  * src addr selection failed to find a route
4387                                  * (or valid source addr), so we can't get
4388                                  * there from here!
4389                                  */
4390                                 sctp_handle_no_route(stcb, net, so_locked);
4391                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4392                                 sctp_m_freem(m);
4393                                 return (EHOSTUNREACH);
4394                         }
4395                         /*
4396                          * XXX: sa6 may not have a valid sin6_scope_id in
4397                          * the non-SCOPEDROUTING case.
4398                          */
4399                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4400                         lsa6_storage.sin6_family = AF_INET6;
4401                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4402                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4403                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4404                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4405                                 sctp_m_freem(m);
4406                                 return (error);
4407                         }
4408                         /* XXX */
4409                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4410                         lsa6_storage.sin6_port = inp->sctp_lport;
4411                         lsa6 = &lsa6_storage;
4412                         ip6h->ip6_src = lsa6->sin6_addr;
4413
4414                         if (port) {
4415                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4416                                         sctp_handle_no_route(stcb, net, so_locked);
4417                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4418                                         sctp_m_freem(m);
4419                                         return (EHOSTUNREACH);
4420                                 }
4421                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4422                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4423                                 udp->uh_dport = port;
4424                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4425                                 udp->uh_sum = 0;
4426                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4427                         } else {
4428                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4429                         }
4430
4431                         sctphdr->src_port = src_port;
4432                         sctphdr->dest_port = dest_port;
4433                         sctphdr->v_tag = v_tag;
4434                         sctphdr->checksum = 0;
4435
4436                         /*
4437                          * We set the hop limit now since there is a good
4438                          * chance that our ro pointer is now filled
4439                          */
4440                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4441                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4442
4443 #ifdef SCTP_DEBUG
4444                         /* Copy to be sure something bad is not happening */
4445                         sin6->sin6_addr = ip6h->ip6_dst;
4446                         lsa6->sin6_addr = ip6h->ip6_src;
4447 #endif
4448
4449                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4450                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4451                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4452                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4453                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4454                         if (net) {
4455                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4456                                 /*
4457                                  * preserve the port and scope for link
4458                                  * local send
4459                                  */
4460                                 prev_scope = sin6->sin6_scope_id;
4461                                 prev_port = sin6->sin6_port;
4462                         }
4463                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4464                                 /* failed to prepend data, give up */
4465                                 sctp_m_freem(m);
4466                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4467                                 return (ENOMEM);
4468                         }
4469                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4470                         if (port) {
4471 #if defined(SCTP_WITH_NO_CSUM)
4472                                 SCTP_STAT_INCR(sctps_sendnocrc);
4473 #else
4474                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4475                                 SCTP_STAT_INCR(sctps_sendswcrc);
4476 #endif
4477                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4478                                         udp->uh_sum = 0xffff;
4479                                 }
4480                         } else {
4481 #if defined(SCTP_WITH_NO_CSUM)
4482                                 SCTP_STAT_INCR(sctps_sendnocrc);
4483 #else
4484                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4485                                 m->m_pkthdr.csum_data = 0;
4486                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4487 #endif
4488                         }
4489                         /* send it out. table id is taken from stcb */
4490 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4491                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4492                                 so = SCTP_INP_SO(inp);
4493                                 SCTP_SOCKET_UNLOCK(so, 0);
4494                         }
4495 #endif
4496 #ifdef SCTP_PACKET_LOGGING
4497                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4498                                 sctp_packet_log(o_pak);
4499 #endif
4500                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4501 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4502                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4503                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4504                                 SCTP_TCB_UNLOCK(stcb);
4505                                 SCTP_SOCKET_LOCK(so, 0);
4506                                 SCTP_TCB_LOCK(stcb);
4507                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4508                         }
4509 #endif
4510                         if (net) {
4511                                 /* for link local this must be done */
4512                                 sin6->sin6_scope_id = prev_scope;
4513                                 sin6->sin6_port = prev_port;
4514                         }
4515                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4516                         SCTP_STAT_INCR(sctps_sendpackets);
4517                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4518                         if (ret) {
4519                                 SCTP_STAT_INCR(sctps_senderrors);
4520                         }
4521                         if (net == NULL) {
4522                                 /* Now if we had a temp route free it */
4523                                 if (ro->ro_rt) {
4524                                         RTFREE(ro->ro_rt);
4525                                 }
4526                         } else {
4527                                 /*
4528                                  * PMTU check versus smallest asoc MTU goes
4529                                  * here
4530                                  */
4531                                 if (ro->ro_rt == NULL) {
4532                                         /* Route was freed */
4533                                         if (net->ro._s_addr &&
4534                                             net->src_addr_selected) {
4535                                                 sctp_free_ifa(net->ro._s_addr);
4536                                                 net->ro._s_addr = NULL;
4537                                         }
4538                                         net->src_addr_selected = 0;
4539                                 }
4540                                 if ((ro->ro_rt != NULL) &&
4541                                     (net->ro._s_addr)) {
4542                                         uint32_t mtu;
4543
4544                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4545                                         if (mtu &&
4546                                             (stcb->asoc.smallest_mtu > mtu)) {
4547                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4548                                                 net->mtu = mtu;
4549                                                 if (net->port) {
4550                                                         net->mtu -= sizeof(struct udphdr);
4551                                                 }
4552                                         }
4553                                 } else if (ifp) {
4554                                         if (ND_IFINFO(ifp)->linkmtu &&
4555                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4556                                                 sctp_mtu_size_reset(inp,
4557                                                     &stcb->asoc,
4558                                                     ND_IFINFO(ifp)->linkmtu);
4559                                         }
4560                                 }
4561                         }
4562                         return (ret);
4563                 }
4564 #endif
4565         default:
4566                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4567                     ((struct sockaddr *)to)->sa_family);
4568                 sctp_m_freem(m);
4569                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4570                 return (EFAULT);
4571         }
4572 }
4573
4574
4575 void
4576 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4577 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4578     SCTP_UNUSED
4579 #endif
4580 )
4581 {
4582         struct mbuf *m, *m_at, *mp_last;
4583         struct sctp_nets *net;
4584         struct sctp_init_chunk *init;
4585         struct sctp_supported_addr_param *sup_addr;
4586         struct sctp_adaptation_layer_indication *ali;
4587         struct sctp_ecn_supported_param *ecn;
4588         struct sctp_prsctp_supported_param *prsctp;
4589         struct sctp_supported_chunk_types_param *pr_supported;
4590         int cnt_inits_to = 0;
4591         int padval, ret;
4592         int num_ext;
4593         int p_len;
4594
4595         /* INIT's always go to the primary (and usually ONLY address) */
4596         mp_last = NULL;
4597         net = stcb->asoc.primary_destination;
4598         if (net == NULL) {
4599                 net = TAILQ_FIRST(&stcb->asoc.nets);
4600                 if (net == NULL) {
4601                         /* TSNH */
4602                         return;
4603                 }
4604                 /* we confirm any address we send an INIT to */
4605                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4606                 (void)sctp_set_primary_addr(stcb, NULL, net);
4607         } else {
4608                 /* we confirm any address we send an INIT to */
4609                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4610         }
4611         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4612 #ifdef INET6
4613         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4614                 /*
4615                  * special hook, if we are sending to link local it will not
4616                  * show up in our private address count.
4617                  */
4618                 struct sockaddr_in6 *sin6l;
4619
4620                 sin6l = &net->ro._l_addr.sin6;
4621                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4622                         cnt_inits_to = 1;
4623         }
4624 #endif
4625         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4626                 /* This case should not happen */
4627                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4628                 return;
4629         }
4630         /* start the INIT timer */
4631         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4632
4633         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4634         if (m == NULL) {
4635                 /* No memory, INIT timer will re-attempt. */
4636                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4637                 return;
4638         }
4639         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4640         /*
4641          * assume peer supports asconf in order to be able to queue local
4642          * address changes while an INIT is in flight and before the assoc
4643          * is established.
4644          */
4645         stcb->asoc.peer_supports_asconf = 1;
4646         /* Now lets put the SCTP header in place */
4647         init = mtod(m, struct sctp_init_chunk *);
4648         /* now the chunk header */
4649         init->ch.chunk_type = SCTP_INITIATION;
4650         init->ch.chunk_flags = 0;
4651         /* fill in later from mbuf we build */
4652         init->ch.chunk_length = 0;
4653         /* place in my tag */
4654         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4655         /* set up some of the credits. */
4656         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4657             SCTP_MINIMAL_RWND));
4658
4659         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4660         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4661         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4662         /* now the address restriction */
4663         /* XXX Should we take the address family of the socket into account? */
4664         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4665             sizeof(*init));
4666         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4667 #ifdef INET6
4668 #ifdef INET
4669         /* we support 2 types: IPv4/IPv6 */
4670         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4671         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4672         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4673 #else
4674         /* we support 1 type: IPv6 */
4675         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4676         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4677         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4678 #endif
4679 #else
4680         /* we support 1 type: IPv4 */
4681         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4682         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4683         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4684 #endif
4685         SCTP_BUF_LEN(m) += sizeof(struct sctp_supported_addr_param);
4686         /* adaptation layer indication parameter */
4687         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(struct sctp_supported_addr_param));
4688         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4689         ali->ph.param_length = htons(sizeof(*ali));
4690         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4691         SCTP_BUF_LEN(m) += sizeof(*ali);
4692         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4693
4694         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4695                 /* Add NAT friendly parameter */
4696                 struct sctp_paramhdr *ph;
4697
4698                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4699                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4700                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4701                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4702                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4703         }
4704         /* now any cookie time extensions */
4705         if (stcb->asoc.cookie_preserve_req) {
4706                 struct sctp_cookie_perserve_param *cookie_preserve;
4707
4708                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4709                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4710                 cookie_preserve->ph.param_length = htons(
4711                     sizeof(*cookie_preserve));
4712                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4713                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4714                 ecn = (struct sctp_ecn_supported_param *)(
4715                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4716                 stcb->asoc.cookie_preserve_req = 0;
4717         }
4718         /* ECN parameter */
4719         if (stcb->asoc.ecn_allowed == 1) {
4720                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4721                 ecn->ph.param_length = htons(sizeof(*ecn));
4722                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4723                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4724                     sizeof(*ecn));
4725         } else {
4726                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4727         }
4728         /* And now tell the peer we do pr-sctp */
4729         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4730         prsctp->ph.param_length = htons(sizeof(*prsctp));
4731         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4732
4733         /* And now tell the peer we do all the extensions */
4734         pr_supported = (struct sctp_supported_chunk_types_param *)
4735             ((caddr_t)prsctp + sizeof(*prsctp));
4736         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4737         num_ext = 0;
4738         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4739         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4740         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4741         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4742         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4743         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4744                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4745         }
4746         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4747                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4748         }
4749         p_len = sizeof(*pr_supported) + num_ext;
4750         pr_supported->ph.param_length = htons(p_len);
4751         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4752         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4753
4754
4755         /* add authentication parameters */
4756         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4757                 struct sctp_auth_random *randp;
4758                 struct sctp_auth_hmac_algo *hmacs;
4759                 struct sctp_auth_chunk_list *chunks;
4760
4761                 /* attach RANDOM parameter, if available */
4762                 if (stcb->asoc.authinfo.random != NULL) {
4763                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4764                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4765                         /* random key already contains the header */
4766                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4767                         /* zero out any padding required */
4768                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4769                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4770                 }
4771                 /* add HMAC_ALGO parameter */
4772                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4773                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4774                     (uint8_t *) hmacs->hmac_ids);
4775                 if (p_len > 0) {
4776                         p_len += sizeof(*hmacs);
4777                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4778                         hmacs->ph.param_length = htons(p_len);
4779                         /* zero out any padding required */
4780                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4781                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4782                 }
4783                 /* add CHUNKS parameter */
4784                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4785                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4786                     chunks->chunk_types);
4787                 if (p_len > 0) {
4788                         p_len += sizeof(*chunks);
4789                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4790                         chunks->ph.param_length = htons(p_len);
4791                         /* zero out any padding required */
4792                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4793                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4794                 }
4795         }
4796         /* now the addresses */
4797         {
4798                 struct sctp_scoping scp;
4799
4800                 /*
4801                  * To optimize this we could put the scoping stuff into a
4802                  * structure and remove the individual uint8's from the
4803                  * assoc structure. Then we could just sifa in the address
4804                  * within the stcb. But for now this is a quick hack to get
4805                  * the address stuff teased apart.
4806                  */
4807
4808                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4809                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4810                 scp.loopback_scope = stcb->asoc.loopback_scope;
4811                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4812                 scp.local_scope = stcb->asoc.local_scope;
4813                 scp.site_scope = stcb->asoc.site_scope;
4814
4815                 sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to);
4816         }
4817
4818         /* calulate the size and update pkt header and chunk header */
4819         p_len = 0;
4820         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4821                 if (SCTP_BUF_NEXT(m_at) == NULL)
4822                         mp_last = m_at;
4823                 p_len += SCTP_BUF_LEN(m_at);
4824         }
4825         init->ch.chunk_length = htons(p_len);
4826         /*
4827          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4828          * here since the timer will drive a retranmission.
4829          */
4830
4831         /* I don't expect this to execute but we will be safe here */
4832         padval = p_len % 4;
4833         if ((padval) && (mp_last)) {
4834                 /*
4835                  * The compiler worries that mp_last may not be set even
4836                  * though I think it is impossible :-> however we add
4837                  * mp_last here just in case.
4838                  */
4839                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4840                 if (ret) {
4841                         /* Houston we have a problem, no space */
4842                         sctp_m_freem(m);
4843                         return;
4844                 }
4845         }
4846         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4847         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4848             (struct sockaddr *)&net->ro._l_addr,
4849             m, 0, NULL, 0, 0, 0, 0,
4850             inp->sctp_lport, stcb->rport, htonl(0),
4851             net->port, NULL,
4852             0, 0,
4853             so_locked);
4854         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4855         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4856         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4857 }
4858
4859 struct mbuf *
4860 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4861     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4862 {
4863         /*
4864          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4865          * being equal to the beginning of the params i.e. (iphlen +
4866          * sizeof(struct sctp_init_msg) parse through the parameters to the
4867          * end of the mbuf verifying that all parameters are known.
4868          *
4869          * For unknown parameters build and return a mbuf with
4870          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4871          * processing this chunk stop, and set *abort_processing to 1.
4872          *
4873          * By having param_offset be pre-set to where parameters begin it is
4874          * hoped that this routine may be reused in the future by new
4875          * features.
4876          */
4877         struct sctp_paramhdr *phdr, params;
4878
4879         struct mbuf *mat, *op_err;
4880         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4881         int at, limit, pad_needed;
4882         uint16_t ptype, plen, padded_size;
4883         int err_at;
4884
4885         *abort_processing = 0;
4886         mat = in_initpkt;
4887         err_at = 0;
4888         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4889         at = param_offset;
4890         op_err = NULL;
4891         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4892         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4893         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4894                 ptype = ntohs(phdr->param_type);
4895                 plen = ntohs(phdr->param_length);
4896                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4897                         /* wacked parameter */
4898                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4899                         goto invalid_size;
4900                 }
4901                 limit -= SCTP_SIZE32(plen);
4902                 /*-
4903                  * All parameters for all chunks that we know/understand are
4904                  * listed here. We process them other places and make
4905                  * appropriate stop actions per the upper bits. However this
4906                  * is the generic routine processor's can call to get back
4907                  * an operr.. to either incorporate (init-ack) or send.
4908                  */
4909                 padded_size = SCTP_SIZE32(plen);
4910                 switch (ptype) {
4911                         /* Param's with variable size */
4912                 case SCTP_HEARTBEAT_INFO:
4913                 case SCTP_STATE_COOKIE:
4914                 case SCTP_UNRECOG_PARAM:
4915                 case SCTP_ERROR_CAUSE_IND:
4916                         /* ok skip fwd */
4917                         at += padded_size;
4918                         break;
4919                         /* Param's with variable size within a range */
4920                 case SCTP_CHUNK_LIST:
4921                 case SCTP_SUPPORTED_CHUNK_EXT:
4922                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4923                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4924                                 goto invalid_size;
4925                         }
4926                         at += padded_size;
4927                         break;
4928                 case SCTP_SUPPORTED_ADDRTYPE:
4929                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4930                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4931                                 goto invalid_size;
4932                         }
4933                         at += padded_size;
4934                         break;
4935                 case SCTP_RANDOM:
4936                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4937                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4938                                 goto invalid_size;
4939                         }
4940                         at += padded_size;
4941                         break;
4942                 case SCTP_SET_PRIM_ADDR:
4943                 case SCTP_DEL_IP_ADDRESS:
4944                 case SCTP_ADD_IP_ADDRESS:
4945                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4946                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4947                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4948                                 goto invalid_size;
4949                         }
4950                         at += padded_size;
4951                         break;
4952                         /* Param's with a fixed size */
4953                 case SCTP_IPV4_ADDRESS:
4954                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4955                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4956                                 goto invalid_size;
4957                         }
4958                         at += padded_size;
4959                         break;
4960                 case SCTP_IPV6_ADDRESS:
4961                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4962                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4963                                 goto invalid_size;
4964                         }
4965                         at += padded_size;
4966                         break;
4967                 case SCTP_COOKIE_PRESERVE:
4968                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4969                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4970                                 goto invalid_size;
4971                         }
4972                         at += padded_size;
4973                         break;
4974                 case SCTP_HAS_NAT_SUPPORT:
4975                         *nat_friendly = 1;
4976                         /* fall through */
4977                 case SCTP_PRSCTP_SUPPORTED:
4978
4979                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4980                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4981                                 goto invalid_size;
4982                         }
4983                         at += padded_size;
4984                         break;
4985                 case SCTP_ECN_CAPABLE:
4986                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4987                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4988                                 goto invalid_size;
4989                         }
4990                         at += padded_size;
4991                         break;
4992                 case SCTP_ULP_ADAPTATION:
4993                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4994                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4995                                 goto invalid_size;
4996                         }
4997                         at += padded_size;
4998                         break;
4999                 case SCTP_SUCCESS_REPORT:
5000                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5001                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5002                                 goto invalid_size;
5003                         }
5004                         at += padded_size;
5005                         break;
5006                 case SCTP_HOSTNAME_ADDRESS:
5007                         {
5008                                 /* We can NOT handle HOST NAME addresses!! */
5009                                 int l_len;
5010
5011                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5012                                 *abort_processing = 1;
5013                                 if (op_err == NULL) {
5014                                         /* Ok need to try to get a mbuf */
5015 #ifdef INET6
5016                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5017 #else
5018                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5019 #endif
5020                                         l_len += plen;
5021                                         l_len += sizeof(struct sctp_paramhdr);
5022                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5023                                         if (op_err) {
5024                                                 SCTP_BUF_LEN(op_err) = 0;
5025                                                 /*
5026                                                  * pre-reserve space for ip
5027                                                  * and sctp header  and
5028                                                  * chunk hdr
5029                                                  */
5030 #ifdef INET6
5031                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5032 #else
5033                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5034 #endif
5035                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5036                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5037                                         }
5038                                 }
5039                                 if (op_err) {
5040                                         /* If we have space */
5041                                         struct sctp_paramhdr s;
5042
5043                                         if (err_at % 4) {
5044                                                 uint32_t cpthis = 0;
5045
5046                                                 pad_needed = 4 - (err_at % 4);
5047                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5048                                                 err_at += pad_needed;
5049                                         }
5050                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5051                                         s.param_length = htons(sizeof(s) + plen);
5052                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5053                                         err_at += sizeof(s);
5054                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5055                                         if (phdr == NULL) {
5056                                                 sctp_m_freem(op_err);
5057                                                 /*
5058                                                  * we are out of memory but
5059                                                  * we still need to have a
5060                                                  * look at what to do (the
5061                                                  * system is in trouble
5062                                                  * though).
5063                                                  */
5064                                                 return (NULL);
5065                                         }
5066                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5067                                 }
5068                                 return (op_err);
5069                                 break;
5070                         }
5071                 default:
5072                         /*
5073                          * we do not recognize the parameter figure out what
5074                          * we do.
5075                          */
5076                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5077                         if ((ptype & 0x4000) == 0x4000) {
5078                                 /* Report bit is set?? */
5079                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5080                                 if (op_err == NULL) {
5081                                         int l_len;
5082
5083                                         /* Ok need to try to get an mbuf */
5084 #ifdef INET6
5085                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5086 #else
5087                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5088 #endif
5089                                         l_len += plen;
5090                                         l_len += sizeof(struct sctp_paramhdr);
5091                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5092                                         if (op_err) {
5093                                                 SCTP_BUF_LEN(op_err) = 0;
5094 #ifdef INET6
5095                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5096 #else
5097                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5098 #endif
5099                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5100                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5101                                         }
5102                                 }
5103                                 if (op_err) {
5104                                         /* If we have space */
5105                                         struct sctp_paramhdr s;
5106
5107                                         if (err_at % 4) {
5108                                                 uint32_t cpthis = 0;
5109
5110                                                 pad_needed = 4 - (err_at % 4);
5111                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5112                                                 err_at += pad_needed;
5113                                         }
5114                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5115                                         s.param_length = htons(sizeof(s) + plen);
5116                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5117                                         err_at += sizeof(s);
5118                                         if (plen > sizeof(tempbuf)) {
5119                                                 plen = sizeof(tempbuf);
5120                                         }
5121                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5122                                         if (phdr == NULL) {
5123                                                 sctp_m_freem(op_err);
5124                                                 /*
5125                                                  * we are out of memory but
5126                                                  * we still need to have a
5127                                                  * look at what to do (the
5128                                                  * system is in trouble
5129                                                  * though).
5130                                                  */
5131                                                 op_err = NULL;
5132                                                 goto more_processing;
5133                                         }
5134                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5135                                         err_at += plen;
5136                                 }
5137                         }
5138         more_processing:
5139                         if ((ptype & 0x8000) == 0x0000) {
5140                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5141                                 return (op_err);
5142                         } else {
5143                                 /* skip this chunk and continue processing */
5144                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5145                                 at += SCTP_SIZE32(plen);
5146                         }
5147                         break;
5148
5149                 }
5150                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5151         }
5152         return (op_err);
5153 invalid_size:
5154         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5155         *abort_processing = 1;
5156         if ((op_err == NULL) && phdr) {
5157                 int l_len;
5158
5159 #ifdef INET6
5160                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5161 #else
5162                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5163 #endif
5164                 l_len += (2 * sizeof(struct sctp_paramhdr));
5165                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5166                 if (op_err) {
5167                         SCTP_BUF_LEN(op_err) = 0;
5168 #ifdef INET6
5169                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5170 #else
5171                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5172 #endif
5173                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5174                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5175                 }
5176         }
5177         if ((op_err) && phdr) {
5178                 struct sctp_paramhdr s;
5179
5180                 if (err_at % 4) {
5181                         uint32_t cpthis = 0;
5182
5183                         pad_needed = 4 - (err_at % 4);
5184                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5185                         err_at += pad_needed;
5186                 }
5187                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5188                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5189                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5190                 err_at += sizeof(s);
5191                 /* Only copy back the p-hdr that caused the issue */
5192                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5193         }
5194         return (op_err);
5195 }
5196
5197 static int
5198 sctp_are_there_new_addresses(struct sctp_association *asoc,
5199     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
5200 {
5201         /*
5202          * Given a INIT packet, look through the packet to verify that there
5203          * are NO new addresses. As we go through the parameters add reports
5204          * of any un-understood parameters that require an error.  Also we
5205          * must return (1) to drop the packet if we see a un-understood
5206          * parameter that tells us to drop the chunk.
5207          */
5208         struct sockaddr *sa_touse;
5209         struct sockaddr *sa;
5210         struct sctp_paramhdr *phdr, params;
5211         uint16_t ptype, plen;
5212         uint8_t fnd;
5213         struct sctp_nets *net;
5214
5215 #ifdef INET
5216         struct sockaddr_in sin4, *sa4;
5217
5218 #endif
5219 #ifdef INET6
5220         struct sockaddr_in6 sin6, *sa6;
5221
5222 #endif
5223
5224 #ifdef INET
5225         memset(&sin4, 0, sizeof(sin4));
5226         sin4.sin_family = AF_INET;
5227         sin4.sin_len = sizeof(sin4);
5228 #endif
5229 #ifdef INET6
5230         memset(&sin6, 0, sizeof(sin6));
5231         sin6.sin6_family = AF_INET6;
5232         sin6.sin6_len = sizeof(sin6);
5233 #endif
5234         /* First what about the src address of the pkt ? */
5235         fnd = 0;
5236         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5237                 sa = (struct sockaddr *)&net->ro._l_addr;
5238                 if (sa->sa_family == src->sa_family) {
5239 #ifdef INET
5240                         if (sa->sa_family == AF_INET) {
5241                                 struct sockaddr_in *src4;
5242
5243                                 sa4 = (struct sockaddr_in *)sa;
5244                                 src4 = (struct sockaddr_in *)src;
5245                                 if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
5246                                         fnd = 1;
5247                                         break;
5248                                 }
5249                         }
5250 #endif
5251 #ifdef INET6
5252                         if (sa->sa_family == AF_INET6) {
5253                                 struct sockaddr_in6 *src6;
5254
5255                                 sa6 = (struct sockaddr_in6 *)sa;
5256                                 src6 = (struct sockaddr_in6 *)src;
5257                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
5258                                         fnd = 1;
5259                                         break;
5260                                 }
5261                         }
5262 #endif
5263                 }
5264         }
5265         if (fnd == 0) {
5266                 /* New address added! no need to look futher. */
5267                 return (1);
5268         }
5269         /* Ok so far lets munge through the rest of the packet */
5270         offset += sizeof(struct sctp_init_chunk);
5271         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5272         while (phdr) {
5273                 sa_touse = NULL;
5274                 ptype = ntohs(phdr->param_type);
5275                 plen = ntohs(phdr->param_length);
5276                 switch (ptype) {
5277 #ifdef INET
5278                 case SCTP_IPV4_ADDRESS:
5279                         {
5280                                 struct sctp_ipv4addr_param *p4, p4_buf;
5281
5282                                 phdr = sctp_get_next_param(in_initpkt, offset,
5283                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5284                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5285                                     phdr == NULL) {
5286                                         return (1);
5287                                 }
5288                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5289                                 sin4.sin_addr.s_addr = p4->addr;
5290                                 sa_touse = (struct sockaddr *)&sin4;
5291                                 break;
5292                         }
5293 #endif
5294 #ifdef INET6
5295                 case SCTP_IPV6_ADDRESS:
5296                         {
5297                                 struct sctp_ipv6addr_param *p6, p6_buf;
5298
5299                                 phdr = sctp_get_next_param(in_initpkt, offset,
5300                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5301                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5302                                     phdr == NULL) {
5303                                         return (1);
5304                                 }
5305                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5306                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5307                                     sizeof(p6->addr));
5308                                 sa_touse = (struct sockaddr *)&sin6;
5309                                 break;
5310                         }
5311 #endif
5312                 default:
5313                         sa_touse = NULL;
5314                         break;
5315                 }
5316                 if (sa_touse) {
5317                         /* ok, sa_touse points to one to check */
5318                         fnd = 0;
5319                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5320                                 sa = (struct sockaddr *)&net->ro._l_addr;
5321                                 if (sa->sa_family != sa_touse->sa_family) {
5322                                         continue;
5323                                 }
5324 #ifdef INET
5325                                 if (sa->sa_family == AF_INET) {
5326                                         sa4 = (struct sockaddr_in *)sa;
5327                                         if (sa4->sin_addr.s_addr ==
5328                                             sin4.sin_addr.s_addr) {
5329                                                 fnd = 1;
5330                                                 break;
5331                                         }
5332                                 }
5333 #endif
5334 #ifdef INET6
5335                                 if (sa->sa_family == AF_INET6) {
5336                                         sa6 = (struct sockaddr_in6 *)sa;
5337                                         if (SCTP6_ARE_ADDR_EQUAL(
5338                                             sa6, &sin6)) {
5339                                                 fnd = 1;
5340                                                 break;
5341                                         }
5342                                 }
5343 #endif
5344                         }
5345                         if (!fnd) {
5346                                 /* New addr added! no need to look further */
5347                                 return (1);
5348                         }
5349                 }
5350                 offset += SCTP_SIZE32(plen);
5351                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5352         }
5353         return (0);
5354 }
5355
5356 /*
5357  * Given a MBUF chain that was sent into us containing an INIT. Build a
5358  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5359  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5360  * message (i.e. the struct sctp_init_msg).
5361  */
5362 void
5363 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5364     struct mbuf *init_pkt, int iphlen, int offset,
5365     struct sockaddr *src, struct sockaddr *dst,
5366     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5367     uint8_t use_mflowid, uint32_t mflowid,
5368     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5369 {
5370         struct sctp_association *asoc;
5371         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5372         struct sctp_init_ack_chunk *initack;
5373         struct sctp_adaptation_layer_indication *ali;
5374         struct sctp_ecn_supported_param *ecn;
5375         struct sctp_prsctp_supported_param *prsctp;
5376         struct sctp_supported_chunk_types_param *pr_supported;
5377         union sctp_sockstore *over_addr;
5378
5379 #ifdef INET
5380         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
5381         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
5382         struct sockaddr_in *sin;
5383
5384 #endif
5385 #ifdef INET6
5386         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
5387         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
5388         struct sockaddr_in6 *sin6;
5389
5390 #endif
5391         struct sockaddr *to;
5392         struct sctp_state_cookie stc;
5393         struct sctp_nets *net = NULL;
5394         uint8_t *signature = NULL;
5395         int cnt_inits_to = 0;
5396         uint16_t his_limit, i_want;
5397         int abort_flag, padval;
5398         int num_ext;
5399         int p_len;
5400         int nat_friendly = 0;
5401         struct socket *so;
5402
5403         if (stcb) {
5404                 asoc = &stcb->asoc;
5405         } else {
5406                 asoc = NULL;
5407         }
5408         mp_last = NULL;
5409         if ((asoc != NULL) &&
5410             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5411             (sctp_are_there_new_addresses(asoc, init_pkt, offset, src))) {
5412                 /* new addresses, out of here in non-cookie-wait states */
5413                 /*
5414                  * Send a ABORT, we don't add the new address error clause
5415                  * though we even set the T bit and copy in the 0 tag.. this
5416                  * looks no different than if no listener was present.
5417                  */
5418                 sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, NULL,
5419                     use_mflowid, mflowid,
5420                     vrf_id, port);
5421                 return;
5422         }
5423         abort_flag = 0;
5424         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5425             (offset + sizeof(struct sctp_init_chunk)),
5426             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5427         if (abort_flag) {
5428 do_a_abort:
5429                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
5430                     init_chk->init.initiate_tag, op_err,
5431                     use_mflowid, mflowid,
5432                     vrf_id, port);
5433                 return;
5434         }
5435         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5436         if (m == NULL) {
5437                 /* No memory, INIT timer will re-attempt. */
5438                 if (op_err)
5439                         sctp_m_freem(op_err);
5440                 return;
5441         }
5442         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5443
5444         /* the time I built cookie */
5445         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5446
5447         /* populate any tie tags */
5448         if (asoc != NULL) {
5449                 /* unlock before tag selections */
5450                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5451                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5452                 stc.cookie_life = asoc->cookie_life;
5453                 net = asoc->primary_destination;
5454         } else {
5455                 stc.tie_tag_my_vtag = 0;
5456                 stc.tie_tag_peer_vtag = 0;
5457                 /* life I will award this cookie */
5458                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5459         }
5460
5461         /* copy in the ports for later check */
5462         stc.myport = sh->dest_port;
5463         stc.peerport = sh->src_port;
5464
5465         /*
5466          * If we wanted to honor cookie life extentions, we would add to
5467          * stc.cookie_life. For now we should NOT honor any extension
5468          */
5469         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5470         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5471                 struct inpcb *in_inp;
5472
5473                 /* Its a V6 socket */
5474                 in_inp = (struct inpcb *)inp;
5475                 stc.ipv6_addr_legal = 1;
5476                 /* Now look at the binding flag to see if V4 will be legal */
5477                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5478                         stc.ipv4_addr_legal = 1;
5479                 } else {
5480                         /* V4 addresses are NOT legal on the association */
5481                         stc.ipv4_addr_legal = 0;
5482                 }
5483         } else {
5484                 /* Its a V4 socket, no - V6 */
5485                 stc.ipv4_addr_legal = 1;
5486                 stc.ipv6_addr_legal = 0;
5487         }
5488
5489 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5490         stc.ipv4_scope = 1;
5491 #else
5492         stc.ipv4_scope = 0;
5493 #endif
5494         if (net == NULL) {
5495                 to = src;
5496                 switch (dst->sa_family) {
5497 #ifdef INET
5498                 case AF_INET:
5499                         {
5500                                 /* lookup address */
5501                                 stc.address[0] = src4->sin_addr.s_addr;
5502                                 stc.address[1] = 0;
5503                                 stc.address[2] = 0;
5504                                 stc.address[3] = 0;
5505                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5506                                 /* local from address */
5507                                 stc.laddress[0] = dst4->sin_addr.s_addr;
5508                                 stc.laddress[1] = 0;
5509                                 stc.laddress[2] = 0;
5510                                 stc.laddress[3] = 0;
5511                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5512                                 /* scope_id is only for v6 */
5513                                 stc.scope_id = 0;
5514 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5515                                 if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
5516                                         stc.ipv4_scope = 1;
5517                                 }
5518 #else
5519                                 stc.ipv4_scope = 1;
5520 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5521                                 /* Must use the address in this case */
5522                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5523                                         stc.loopback_scope = 1;
5524                                         stc.ipv4_scope = 1;
5525                                         stc.site_scope = 1;
5526                                         stc.local_scope = 0;
5527                                 }
5528                                 break;
5529                         }
5530 #endif
5531 #ifdef INET6
5532                 case AF_INET6:
5533                         {
5534                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5535                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
5536                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
5537                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
5538                                         stc.loopback_scope = 1;
5539                                         stc.local_scope = 0;
5540                                         stc.site_scope = 1;
5541                                         stc.ipv4_scope = 1;
5542                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
5543                                         /*
5544                                          * If the new destination is a
5545                                          * LINK_LOCAL we must have common
5546                                          * both site and local scope. Don't
5547                                          * set local scope though since we
5548                                          * must depend on the source to be
5549                                          * added implicitly. We cannot
5550                                          * assure just because we share one
5551                                          * link that all links are common.
5552                                          */
5553                                         stc.local_scope = 0;
5554                                         stc.site_scope = 1;
5555                                         stc.ipv4_scope = 1;
5556                                         /*
5557                                          * we start counting for the private
5558                                          * address stuff at 1. since the
5559                                          * link local we source from won't
5560                                          * show up in our scoped count.
5561                                          */
5562                                         cnt_inits_to = 1;
5563                                         /*
5564                                          * pull out the scope_id from
5565                                          * incoming pkt
5566                                          */
5567                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
5568                                         /*
5569                                          * If the new destination is
5570                                          * SITE_LOCAL then we must have site
5571                                          * scope in common.
5572                                          */
5573                                         stc.site_scope = 1;
5574                                 }
5575                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
5576                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5577                                 break;
5578                         }
5579 #endif
5580                 default:
5581                         /* TSNH */
5582                         goto do_a_abort;
5583                         break;
5584                 }
5585         } else {
5586                 /* set the scope per the existing tcb */
5587
5588 #ifdef INET6
5589                 struct sctp_nets *lnet;
5590
5591 #endif
5592
5593                 stc.loopback_scope = asoc->loopback_scope;
5594                 stc.ipv4_scope = asoc->ipv4_local_scope;
5595                 stc.site_scope = asoc->site_scope;
5596                 stc.local_scope = asoc->local_scope;
5597 #ifdef INET6
5598                 /* Why do we not consider IPv4 LL addresses? */
5599                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5600                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5601                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5602                                         /*
5603                                          * if we have a LL address, start
5604                                          * counting at 1.
5605                                          */
5606                                         cnt_inits_to = 1;
5607                                 }
5608                         }
5609                 }
5610 #endif
5611                 /* use the net pointer */
5612                 to = (struct sockaddr *)&net->ro._l_addr;
5613                 switch (to->sa_family) {
5614 #ifdef INET
5615                 case AF_INET:
5616                         sin = (struct sockaddr_in *)to;
5617                         stc.address[0] = sin->sin_addr.s_addr;
5618                         stc.address[1] = 0;
5619                         stc.address[2] = 0;
5620                         stc.address[3] = 0;
5621                         stc.addr_type = SCTP_IPV4_ADDRESS;
5622                         if (net->src_addr_selected == 0) {
5623                                 /*
5624                                  * strange case here, the INIT should have
5625                                  * did the selection.
5626                                  */
5627                                 net->ro._s_addr = sctp_source_address_selection(inp,
5628                                     stcb, (sctp_route_t *) & net->ro,
5629                                     net, 0, vrf_id);
5630                                 if (net->ro._s_addr == NULL)
5631                                         return;
5632
5633                                 net->src_addr_selected = 1;
5634
5635                         }
5636                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5637                         stc.laddress[1] = 0;
5638                         stc.laddress[2] = 0;
5639                         stc.laddress[3] = 0;
5640                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5641                         /* scope_id is only for v6 */
5642                         stc.scope_id = 0;
5643                         break;
5644 #endif
5645 #ifdef INET6
5646                 case AF_INET6:
5647                         sin6 = (struct sockaddr_in6 *)to;
5648                         memcpy(&stc.address, &sin6->sin6_addr,
5649                             sizeof(struct in6_addr));
5650                         stc.addr_type = SCTP_IPV6_ADDRESS;
5651                         stc.scope_id = sin6->sin6_scope_id;
5652                         if (net->src_addr_selected == 0) {
5653                                 /*
5654                                  * strange case here, the INIT should have
5655                                  * done the selection.
5656                                  */
5657                                 net->ro._s_addr = sctp_source_address_selection(inp,
5658                                     stcb, (sctp_route_t *) & net->ro,
5659                                     net, 0, vrf_id);
5660                                 if (net->ro._s_addr == NULL)
5661                                         return;
5662
5663                                 net->src_addr_selected = 1;
5664                         }
5665                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5666                             sizeof(struct in6_addr));
5667                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5668                         break;
5669 #endif
5670                 }
5671         }
5672         /* Now lets put the SCTP header in place */
5673         initack = mtod(m, struct sctp_init_ack_chunk *);
5674         /* Save it off for quick ref */
5675         stc.peers_vtag = init_chk->init.initiate_tag;
5676         /* who are we */
5677         memcpy(stc.identification, SCTP_VERSION_STRING,
5678             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5679         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5680         /* now the chunk header */
5681         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5682         initack->ch.chunk_flags = 0;
5683         /* fill in later from mbuf we build */
5684         initack->ch.chunk_length = 0;
5685         /* place in my tag */
5686         if ((asoc != NULL) &&
5687             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5688             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5689             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5690                 /* re-use the v-tags and init-seq here */
5691                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5692                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5693         } else {
5694                 uint32_t vtag, itsn;
5695
5696                 if (hold_inp_lock) {
5697                         SCTP_INP_INCR_REF(inp);
5698                         SCTP_INP_RUNLOCK(inp);
5699                 }
5700                 if (asoc) {
5701                         atomic_add_int(&asoc->refcnt, 1);
5702                         SCTP_TCB_UNLOCK(stcb);
5703         new_tag:
5704                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5705                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5706                                 /*
5707                                  * Got a duplicate vtag on some guy behind a
5708                                  * nat make sure we don't use it.
5709                                  */
5710                                 goto new_tag;
5711                         }
5712                         initack->init.initiate_tag = htonl(vtag);
5713                         /* get a TSN to use too */
5714                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5715                         initack->init.initial_tsn = htonl(itsn);
5716                         SCTP_TCB_LOCK(stcb);
5717                         atomic_add_int(&asoc->refcnt, -1);
5718                 } else {
5719                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5720                         initack->init.initiate_tag = htonl(vtag);
5721                         /* get a TSN to use too */
5722                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5723                 }
5724                 if (hold_inp_lock) {
5725                         SCTP_INP_RLOCK(inp);
5726                         SCTP_INP_DECR_REF(inp);
5727                 }
5728         }
5729         /* save away my tag to */
5730         stc.my_vtag = initack->init.initiate_tag;
5731
5732         /* set up some of the credits. */
5733         so = inp->sctp_socket;
5734         if (so == NULL) {
5735                 /* memory problem */
5736                 sctp_m_freem(m);
5737                 return;
5738         } else {
5739                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5740         }
5741         /* set what I want */
5742         his_limit = ntohs(init_chk->init.num_inbound_streams);
5743         /* choose what I want */
5744         if (asoc != NULL) {
5745                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5746                         i_want = asoc->streamoutcnt;
5747                 } else {
5748                         i_want = inp->sctp_ep.pre_open_stream_count;
5749                 }
5750         } else {
5751                 i_want = inp->sctp_ep.pre_open_stream_count;
5752         }
5753         if (his_limit < i_want) {
5754                 /* I Want more :< */
5755                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5756         } else {
5757                 /* I can have what I want :> */
5758                 initack->init.num_outbound_streams = htons(i_want);
5759         }
5760         /* tell him his limt. */
5761         initack->init.num_inbound_streams =
5762             htons(inp->sctp_ep.max_open_streams_intome);
5763
5764         /* adaptation layer indication parameter */
5765         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5766         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5767         ali->ph.param_length = htons(sizeof(*ali));
5768         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5769         SCTP_BUF_LEN(m) += sizeof(*ali);
5770         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5771
5772         /* ECN parameter */
5773         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5774             (inp->sctp_ecn_enable == 1)) {
5775                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5776                 ecn->ph.param_length = htons(sizeof(*ecn));
5777                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5778
5779                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5780                     sizeof(*ecn));
5781         } else {
5782                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5783         }
5784         /* And now tell the peer we do  pr-sctp */
5785         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5786         prsctp->ph.param_length = htons(sizeof(*prsctp));
5787         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5788         if (nat_friendly) {
5789                 /* Add NAT friendly parameter */
5790                 struct sctp_paramhdr *ph;
5791
5792                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5793                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5794                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5795                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5796         }
5797         /* And now tell the peer we do all the extensions */
5798         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5799         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5800         num_ext = 0;
5801         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5802         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5803         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5804         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5805         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5806         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5807                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5808         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5809                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5810         p_len = sizeof(*pr_supported) + num_ext;
5811         pr_supported->ph.param_length = htons(p_len);
5812         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5813         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5814
5815         /* add authentication parameters */
5816         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5817                 struct sctp_auth_random *randp;
5818                 struct sctp_auth_hmac_algo *hmacs;
5819                 struct sctp_auth_chunk_list *chunks;
5820                 uint16_t random_len;
5821
5822                 /* generate and add RANDOM parameter */
5823                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5824                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5825                 randp->ph.param_type = htons(SCTP_RANDOM);
5826                 p_len = sizeof(*randp) + random_len;
5827                 randp->ph.param_length = htons(p_len);
5828                 SCTP_READ_RANDOM(randp->random_data, random_len);
5829                 /* zero out any padding required */
5830                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5831                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5832
5833                 /* add HMAC_ALGO parameter */
5834                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5835                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5836                     (uint8_t *) hmacs->hmac_ids);
5837                 if (p_len > 0) {
5838                         p_len += sizeof(*hmacs);
5839                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5840                         hmacs->ph.param_length = htons(p_len);
5841                         /* zero out any padding required */
5842                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5843                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5844                 }
5845                 /* add CHUNKS parameter */
5846                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5847                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5848                     chunks->chunk_types);
5849                 if (p_len > 0) {
5850                         p_len += sizeof(*chunks);
5851                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5852                         chunks->ph.param_length = htons(p_len);
5853                         /* zero out any padding required */
5854                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5855                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5856                 }
5857         }
5858         m_at = m;
5859         /* now the addresses */
5860         {
5861                 struct sctp_scoping scp;
5862
5863                 /*
5864                  * To optimize this we could put the scoping stuff into a
5865                  * structure and remove the individual uint8's from the stc
5866                  * structure. Then we could just sifa in the address within
5867                  * the stc.. but for now this is a quick hack to get the
5868                  * address stuff teased apart.
5869                  */
5870                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5871                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5872                 scp.loopback_scope = stc.loopback_scope;
5873                 scp.ipv4_local_scope = stc.ipv4_scope;
5874                 scp.local_scope = stc.local_scope;
5875                 scp.site_scope = stc.site_scope;
5876                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5877         }
5878
5879         /* tack on the operational error if present */
5880         if (op_err) {
5881                 struct mbuf *ol;
5882                 int llen;
5883
5884                 llen = 0;
5885                 ol = op_err;
5886
5887                 while (ol) {
5888                         llen += SCTP_BUF_LEN(ol);
5889                         ol = SCTP_BUF_NEXT(ol);
5890                 }
5891                 if (llen % 4) {
5892                         /* must add a pad to the param */
5893                         uint32_t cpthis = 0;
5894                         int padlen;
5895
5896                         padlen = 4 - (llen % 4);
5897                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5898                 }
5899                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5900                         m_at = SCTP_BUF_NEXT(m_at);
5901                 }
5902                 SCTP_BUF_NEXT(m_at) = op_err;
5903                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5904                         m_at = SCTP_BUF_NEXT(m_at);
5905                 }
5906         }
5907         /* pre-calulate the size and update pkt header and chunk header */
5908         p_len = 0;
5909         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5910                 p_len += SCTP_BUF_LEN(m_tmp);
5911                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5912                         /* m_tmp should now point to last one */
5913                         break;
5914                 }
5915         }
5916
5917         /* Now we must build a cookie */
5918         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5919         if (m_cookie == NULL) {
5920                 /* memory problem */
5921                 sctp_m_freem(m);
5922                 return;
5923         }
5924         /* Now append the cookie to the end and update the space/size */
5925         SCTP_BUF_NEXT(m_tmp) = m_cookie;
5926
5927         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5928                 p_len += SCTP_BUF_LEN(m_tmp);
5929                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5930                         /* m_tmp should now point to last one */
5931                         mp_last = m_tmp;
5932                         break;
5933                 }
5934         }
5935         /*
5936          * Place in the size, but we don't include the last pad (if any) in
5937          * the INIT-ACK.
5938          */
5939         initack->ch.chunk_length = htons(p_len);
5940
5941         /*
5942          * Time to sign the cookie, we don't sign over the cookie signature
5943          * though thus we set trailer.
5944          */
5945         (void)sctp_hmac_m(SCTP_HMAC,
5946             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
5947             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
5948             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
5949         /*
5950          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
5951          * here since the timer will drive a retranmission.
5952          */
5953         padval = p_len % 4;
5954         if ((padval) && (mp_last)) {
5955                 /* see my previous comments on mp_last */
5956                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
5957                         /* Houston we have a problem, no space */
5958                         sctp_m_freem(m);
5959                         return;
5960                 }
5961         }
5962         if (stc.loopback_scope) {
5963                 over_addr = (union sctp_sockstore *)dst;
5964         } else {
5965                 over_addr = NULL;
5966         }
5967
5968         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
5969             0, 0,
5970             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
5971             port, over_addr,
5972             use_mflowid, mflowid,
5973             SCTP_SO_NOT_LOCKED);
5974         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
5975 }
5976
5977
5978 static void
5979 sctp_prune_prsctp(struct sctp_tcb *stcb,
5980     struct sctp_association *asoc,
5981     struct sctp_sndrcvinfo *srcv,
5982     int dataout)
5983 {
5984         int freed_spc = 0;
5985         struct sctp_tmit_chunk *chk, *nchk;
5986
5987         SCTP_TCB_LOCK_ASSERT(stcb);
5988         if ((asoc->peer_supports_prsctp) &&
5989             (asoc->sent_queue_cnt_removeable > 0)) {
5990                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
5991                         /*
5992                          * Look for chunks marked with the PR_SCTP flag AND
5993                          * the buffer space flag. If the one being sent is
5994                          * equal or greater priority then purge the old one
5995                          * and free some space.
5996                          */
5997                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
5998                                 /*
5999                                  * This one is PR-SCTP AND buffer space
6000                                  * limited type
6001                                  */
6002                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6003                                         /*
6004                                          * Lower numbers equates to higher
6005                                          * priority so if the one we are
6006                                          * looking at has a larger or equal
6007                                          * priority we want to drop the data
6008                                          * and NOT retransmit it.
6009                                          */
6010                                         if (chk->data) {
6011                                                 /*
6012                                                  * We release the book_size
6013                                                  * if the mbuf is here
6014                                                  */
6015                                                 int ret_spc;
6016                                                 uint8_t sent;
6017
6018                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6019                                                         sent = 1;
6020                                                 else
6021                                                         sent = 0;
6022                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6023                                                     sent,
6024                                                     SCTP_SO_LOCKED);
6025                                                 freed_spc += ret_spc;
6026                                                 if (freed_spc >= dataout) {
6027                                                         return;
6028                                                 }
6029                                         }       /* if chunk was present */
6030                                 }       /* if of sufficent priority */
6031                         }       /* if chunk has enabled */
6032                 }               /* tailqforeach */
6033
6034                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6035                         /* Here we must move to the sent queue and mark */
6036                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6037                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6038                                         if (chk->data) {
6039                                                 /*
6040                                                  * We release the book_size
6041                                                  * if the mbuf is here
6042                                                  */
6043                                                 int ret_spc;
6044
6045                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6046                                                     0, SCTP_SO_LOCKED);
6047
6048                                                 freed_spc += ret_spc;
6049                                                 if (freed_spc >= dataout) {
6050                                                         return;
6051                                                 }
6052                                         }       /* end if chk->data */
6053                                 }       /* end if right class */
6054                         }       /* end if chk pr-sctp */
6055                 }               /* tailqforeachsafe (chk) */
6056         }                       /* if enabled in asoc */
6057 }
6058
6059 int
6060 sctp_get_frag_point(struct sctp_tcb *stcb,
6061     struct sctp_association *asoc)
6062 {
6063         int siz, ovh;
6064
6065         /*
6066          * For endpoints that have both v6 and v4 addresses we must reserve
6067          * room for the ipv6 header, for those that are only dealing with V4
6068          * we use a larger frag point.
6069          */
6070         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6071                 ovh = SCTP_MED_OVERHEAD;
6072         } else {
6073                 ovh = SCTP_MED_V4_OVERHEAD;
6074         }
6075
6076         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6077                 siz = asoc->smallest_mtu - ovh;
6078         else
6079                 siz = (stcb->asoc.sctp_frag_point - ovh);
6080         /*
6081          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6082          */
6083         /* A data chunk MUST fit in a cluster */
6084         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6085         /* } */
6086
6087         /* adjust for an AUTH chunk if DATA requires auth */
6088         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6089                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6090
6091         if (siz % 4) {
6092                 /* make it an even word boundary please */
6093                 siz -= (siz % 4);
6094         }
6095         return (siz);
6096 }
6097
6098 static void
6099 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6100 {
6101         sp->pr_sctp_on = 0;
6102         /*
6103          * We assume that the user wants PR_SCTP_TTL if the user provides a
6104          * positive lifetime but does not specify any PR_SCTP policy. This
6105          * is a BAD assumption and causes problems at least with the
6106          * U-Vancovers MPI folks. I will change this to be no policy means
6107          * NO PR-SCTP.
6108          */
6109         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6110                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6111                 sp->pr_sctp_on = 1;
6112         } else {
6113                 return;
6114         }
6115         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6116         case CHUNK_FLAGS_PR_SCTP_BUF:
6117                 /*
6118                  * Time to live is a priority stored in tv_sec when doing
6119                  * the buffer drop thing.
6120                  */
6121                 sp->ts.tv_sec = sp->timetolive;
6122                 sp->ts.tv_usec = 0;
6123                 break;
6124         case CHUNK_FLAGS_PR_SCTP_TTL:
6125                 {
6126                         struct timeval tv;
6127
6128                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6129                         tv.tv_sec = sp->timetolive / 1000;
6130                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6131                         /*
6132                          * TODO sctp_constants.h needs alternative time
6133                          * macros when _KERNEL is undefined.
6134                          */
6135                         timevaladd(&sp->ts, &tv);
6136                 }
6137                 break;
6138         case CHUNK_FLAGS_PR_SCTP_RTX:
6139                 /*
6140                  * Time to live is a the number or retransmissions stored in
6141                  * tv_sec.
6142                  */
6143                 sp->ts.tv_sec = sp->timetolive;
6144                 sp->ts.tv_usec = 0;
6145                 break;
6146         default:
6147                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6148                     "Unknown PR_SCTP policy %u.\n",
6149                     PR_SCTP_POLICY(sp->sinfo_flags));
6150                 break;
6151         }
6152 }
6153
6154 static int
6155 sctp_msg_append(struct sctp_tcb *stcb,
6156     struct sctp_nets *net,
6157     struct mbuf *m,
6158     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6159 {
6160         int error = 0;
6161         struct mbuf *at;
6162         struct sctp_stream_queue_pending *sp = NULL;
6163         struct sctp_stream_out *strm;
6164
6165         /*
6166          * Given an mbuf chain, put it into the association send queue and
6167          * place it on the wheel
6168          */
6169         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6170                 /* Invalid stream number */
6171                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6172                 error = EINVAL;
6173                 goto out_now;
6174         }
6175         if ((stcb->asoc.stream_locked) &&
6176             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6177                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6178                 error = EINVAL;
6179                 goto out_now;
6180         }
6181         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6182         /* Now can we send this? */
6183         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6184             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6185             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6186             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6187                 /* got data while shutting down */
6188                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6189                 error = ECONNRESET;
6190                 goto out_now;
6191         }
6192         sctp_alloc_a_strmoq(stcb, sp);
6193         if (sp == NULL) {
6194                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6195                 error = ENOMEM;
6196                 goto out_now;
6197         }
6198         sp->sinfo_flags = srcv->sinfo_flags;
6199         sp->timetolive = srcv->sinfo_timetolive;
6200         sp->ppid = srcv->sinfo_ppid;
6201         sp->context = srcv->sinfo_context;
6202         sp->strseq = 0;
6203         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6204                 sp->net = net;
6205                 atomic_add_int(&sp->net->ref_count, 1);
6206         } else {
6207                 sp->net = NULL;
6208         }
6209         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6210         sp->stream = srcv->sinfo_stream;
6211         sp->msg_is_complete = 1;
6212         sp->sender_all_done = 1;
6213         sp->some_taken = 0;
6214         sp->data = m;
6215         sp->tail_mbuf = NULL;
6216         sctp_set_prsctp_policy(sp);
6217         /*
6218          * We could in theory (for sendall) sifa the length in, but we would
6219          * still have to hunt through the chain since we need to setup the
6220          * tail_mbuf
6221          */
6222         sp->length = 0;
6223         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6224                 if (SCTP_BUF_NEXT(at) == NULL)
6225                         sp->tail_mbuf = at;
6226                 sp->length += SCTP_BUF_LEN(at);
6227         }
6228         if (srcv->sinfo_keynumber_valid) {
6229                 sp->auth_keyid = srcv->sinfo_keynumber;
6230         } else {
6231                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6232         }
6233         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6234                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6235                 sp->holds_key_ref = 1;
6236         }
6237         if (hold_stcb_lock == 0) {
6238                 SCTP_TCB_SEND_LOCK(stcb);
6239         }
6240         sctp_snd_sb_alloc(stcb, sp->length);
6241         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6242         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6243         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6244                 sp->strseq = strm->next_sequence_sent;
6245                 strm->next_sequence_sent++;
6246         }
6247         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6248         m = NULL;
6249         if (hold_stcb_lock == 0) {
6250                 SCTP_TCB_SEND_UNLOCK(stcb);
6251         }
6252 out_now:
6253         if (m) {
6254                 sctp_m_freem(m);
6255         }
6256         return (error);
6257 }
6258
6259
6260 static struct mbuf *
6261 sctp_copy_mbufchain(struct mbuf *clonechain,
6262     struct mbuf *outchain,
6263     struct mbuf **endofchain,
6264     int can_take_mbuf,
6265     int sizeofcpy,
6266     uint8_t copy_by_ref)
6267 {
6268         struct mbuf *m;
6269         struct mbuf *appendchain;
6270         caddr_t cp;
6271         int len;
6272
6273         if (endofchain == NULL) {
6274                 /* error */
6275 error_out:
6276                 if (outchain)
6277                         sctp_m_freem(outchain);
6278                 return (NULL);
6279         }
6280         if (can_take_mbuf) {
6281                 appendchain = clonechain;
6282         } else {
6283                 if (!copy_by_ref &&
6284                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6285                     ) {
6286                         /* Its not in a cluster */
6287                         if (*endofchain == NULL) {
6288                                 /* lets get a mbuf cluster */
6289                                 if (outchain == NULL) {
6290                                         /* This is the general case */
6291                         new_mbuf:
6292                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6293                                         if (outchain == NULL) {
6294                                                 goto error_out;
6295                                         }
6296                                         SCTP_BUF_LEN(outchain) = 0;
6297                                         *endofchain = outchain;
6298                                         /* get the prepend space */
6299                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6300                                 } else {
6301                                         /*
6302                                          * We really should not get a NULL
6303                                          * in endofchain
6304                                          */
6305                                         /* find end */
6306                                         m = outchain;
6307                                         while (m) {
6308                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6309                                                         *endofchain = m;
6310                                                         break;
6311                                                 }
6312                                                 m = SCTP_BUF_NEXT(m);
6313                                         }
6314                                         /* sanity */
6315                                         if (*endofchain == NULL) {
6316                                                 /*
6317                                                  * huh, TSNH XXX maybe we
6318                                                  * should panic
6319                                                  */
6320                                                 sctp_m_freem(outchain);
6321                                                 goto new_mbuf;
6322                                         }
6323                                 }
6324                                 /* get the new end of length */
6325                                 len = M_TRAILINGSPACE(*endofchain);
6326                         } else {
6327                                 /* how much is left at the end? */
6328                                 len = M_TRAILINGSPACE(*endofchain);
6329                         }
6330                         /* Find the end of the data, for appending */
6331                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6332
6333                         /* Now lets copy it out */
6334                         if (len >= sizeofcpy) {
6335                                 /* It all fits, copy it in */
6336                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6337                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6338                         } else {
6339                                 /* fill up the end of the chain */
6340                                 if (len > 0) {
6341                                         m_copydata(clonechain, 0, len, cp);
6342                                         SCTP_BUF_LEN((*endofchain)) += len;
6343                                         /* now we need another one */
6344                                         sizeofcpy -= len;
6345                                 }
6346                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6347                                 if (m == NULL) {
6348                                         /* We failed */
6349                                         goto error_out;
6350                                 }
6351                                 SCTP_BUF_NEXT((*endofchain)) = m;
6352                                 *endofchain = m;
6353                                 cp = mtod((*endofchain), caddr_t);
6354                                 m_copydata(clonechain, len, sizeofcpy, cp);
6355                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6356                         }
6357                         return (outchain);
6358                 } else {
6359                         /* copy the old fashion way */
6360                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6361 #ifdef SCTP_MBUF_LOGGING
6362                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6363                                 struct mbuf *mat;
6364
6365                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6366                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6367                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6368                                         }
6369                                 }
6370                         }
6371 #endif
6372                 }
6373         }
6374         if (appendchain == NULL) {
6375                 /* error */
6376                 if (outchain)
6377                         sctp_m_freem(outchain);
6378                 return (NULL);
6379         }
6380         if (outchain) {
6381                 /* tack on to the end */
6382                 if (*endofchain != NULL) {
6383                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6384                 } else {
6385                         m = outchain;
6386                         while (m) {
6387                                 if (SCTP_BUF_NEXT(m) == NULL) {
6388                                         SCTP_BUF_NEXT(m) = appendchain;
6389                                         break;
6390                                 }
6391                                 m = SCTP_BUF_NEXT(m);
6392                         }
6393                 }
6394                 /*
6395                  * save off the end and update the end-chain postion
6396                  */
6397                 m = appendchain;
6398                 while (m) {
6399                         if (SCTP_BUF_NEXT(m) == NULL) {
6400                                 *endofchain = m;
6401                                 break;
6402                         }
6403                         m = SCTP_BUF_NEXT(m);
6404                 }
6405                 return (outchain);
6406         } else {
6407                 /* save off the end and update the end-chain postion */
6408                 m = appendchain;
6409                 while (m) {
6410                         if (SCTP_BUF_NEXT(m) == NULL) {
6411                                 *endofchain = m;
6412                                 break;
6413                         }
6414                         m = SCTP_BUF_NEXT(m);
6415                 }
6416                 return (appendchain);
6417         }
6418 }
6419
6420 int
6421 sctp_med_chunk_output(struct sctp_inpcb *inp,
6422     struct sctp_tcb *stcb,
6423     struct sctp_association *asoc,
6424     int *num_out,
6425     int *reason_code,
6426     int control_only, int from_where,
6427     struct timeval *now, int *now_filled, int frag_point, int so_locked
6428 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6429     SCTP_UNUSED
6430 #endif
6431 );
6432
6433 static void
6434 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6435     uint32_t val SCTP_UNUSED)
6436 {
6437         struct sctp_copy_all *ca;
6438         struct mbuf *m;
6439         int ret = 0;
6440         int added_control = 0;
6441         int un_sent, do_chunk_output = 1;
6442         struct sctp_association *asoc;
6443         struct sctp_nets *net;
6444
6445         ca = (struct sctp_copy_all *)ptr;
6446         if (ca->m == NULL) {
6447                 return;
6448         }
6449         if (ca->inp != inp) {
6450                 /* TSNH */
6451                 return;
6452         }
6453         if ((ca->m) && ca->sndlen) {
6454                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6455                 if (m == NULL) {
6456                         /* can't copy so we are done */
6457                         ca->cnt_failed++;
6458                         return;
6459                 }
6460 #ifdef SCTP_MBUF_LOGGING
6461                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6462                         struct mbuf *mat;
6463
6464                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6465                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6466                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6467                                 }
6468                         }
6469                 }
6470 #endif
6471         } else {
6472                 m = NULL;
6473         }
6474         SCTP_TCB_LOCK_ASSERT(stcb);
6475         if (stcb->asoc.alternate) {
6476                 net = stcb->asoc.alternate;
6477         } else {
6478                 net = stcb->asoc.primary_destination;
6479         }
6480         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6481                 /* Abort this assoc with m as the user defined reason */
6482                 if (m) {
6483                         struct sctp_paramhdr *ph;
6484
6485                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6486                         if (m) {
6487                                 ph = mtod(m, struct sctp_paramhdr *);
6488                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6489                                 ph->param_length = htons(ca->sndlen);
6490                         }
6491                         /*
6492                          * We add one here to keep the assoc from
6493                          * dis-appearing on us.
6494                          */
6495                         atomic_add_int(&stcb->asoc.refcnt, 1);
6496                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6497                         /*
6498                          * sctp_abort_an_association calls sctp_free_asoc()
6499                          * free association will NOT free it since we
6500                          * incremented the refcnt .. we do this to prevent
6501                          * it being freed and things getting tricky since we
6502                          * could end up (from free_asoc) calling inpcb_free
6503                          * which would get a recursive lock call to the
6504                          * iterator lock.. But as a consequence of that the
6505                          * stcb will return to us un-locked.. since
6506                          * free_asoc returns with either no TCB or the TCB
6507                          * unlocked, we must relock.. to unlock in the
6508                          * iterator timer :-0
6509                          */
6510                         SCTP_TCB_LOCK(stcb);
6511                         atomic_add_int(&stcb->asoc.refcnt, -1);
6512                         goto no_chunk_output;
6513                 }
6514         } else {
6515                 if (m) {
6516                         ret = sctp_msg_append(stcb, net, m,
6517                             &ca->sndrcv, 1);
6518                 }
6519                 asoc = &stcb->asoc;
6520                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6521                         /* shutdown this assoc */
6522                         int cnt;
6523
6524                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6525
6526                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6527                             TAILQ_EMPTY(&asoc->sent_queue) &&
6528                             (cnt == 0)) {
6529                                 if (asoc->locked_on_sending) {
6530                                         goto abort_anyway;
6531                                 }
6532                                 /*
6533                                  * there is nothing queued to send, so I'm
6534                                  * done...
6535                                  */
6536                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6537                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6538                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6539                                         /*
6540                                          * only send SHUTDOWN the first time
6541                                          * through
6542                                          */
6543                                         sctp_send_shutdown(stcb, net);
6544                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6545                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6546                                         }
6547                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6548                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6549                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6550                                             net);
6551                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6552                                             asoc->primary_destination);
6553                                         added_control = 1;
6554                                         do_chunk_output = 0;
6555                                 }
6556                         } else {
6557                                 /*
6558                                  * we still got (or just got) data to send,
6559                                  * so set SHUTDOWN_PENDING
6560                                  */
6561                                 /*
6562                                  * XXX sockets draft says that SCTP_EOF
6563                                  * should be sent with no data.  currently,
6564                                  * we will allow user data to be sent first
6565                                  * and move to SHUTDOWN-PENDING
6566                                  */
6567                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6568                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6569                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6570                                         if (asoc->locked_on_sending) {
6571                                                 /*
6572                                                  * Locked to send out the
6573                                                  * data
6574                                                  */
6575                                                 struct sctp_stream_queue_pending *sp;
6576
6577                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6578                                                 if (sp) {
6579                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6580                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6581                                                 }
6582                                         }
6583                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6584                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6585                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6586                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6587                                 abort_anyway:
6588                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6589                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6590                                                     NULL, SCTP_SO_NOT_LOCKED);
6591                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6592                                                 goto no_chunk_output;
6593                                         }
6594                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6595                                             asoc->primary_destination);
6596                                 }
6597                         }
6598
6599                 }
6600         }
6601         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6602             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6603
6604         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6605             (stcb->asoc.total_flight > 0) &&
6606             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6607             ) {
6608                 do_chunk_output = 0;
6609         }
6610         if (do_chunk_output)
6611                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6612         else if (added_control) {
6613                 int num_out = 0, reason = 0, now_filled = 0;
6614                 struct timeval now;
6615                 int frag_point;
6616
6617                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6618                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6619                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6620         }
6621 no_chunk_output:
6622         if (ret) {
6623                 ca->cnt_failed++;
6624         } else {
6625                 ca->cnt_sent++;
6626         }
6627 }
6628
6629 static void
6630 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6631 {
6632         struct sctp_copy_all *ca;
6633
6634         ca = (struct sctp_copy_all *)ptr;
6635         /*
6636          * Do a notify here? Kacheong suggests that the notify be done at
6637          * the send time.. so you would push up a notification if any send
6638          * failed. Don't know if this is feasable since the only failures we
6639          * have is "memory" related and if you cannot get an mbuf to send
6640          * the data you surely can't get an mbuf to send up to notify the
6641          * user you can't send the data :->
6642          */
6643
6644         /* now free everything */
6645         sctp_m_freem(ca->m);
6646         SCTP_FREE(ca, SCTP_M_COPYAL);
6647 }
6648
6649
6650 #define MC_ALIGN(m, len) do {                                           \
6651         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6652 } while (0)
6653
6654
6655
6656 static struct mbuf *
6657 sctp_copy_out_all(struct uio *uio, int len)
6658 {
6659         struct mbuf *ret, *at;
6660         int left, willcpy, cancpy, error;
6661
6662         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6663         if (ret == NULL) {
6664                 /* TSNH */
6665                 return (NULL);
6666         }
6667         left = len;
6668         SCTP_BUF_LEN(ret) = 0;
6669         /* save space for the data chunk header */
6670         cancpy = M_TRAILINGSPACE(ret);
6671         willcpy = min(cancpy, left);
6672         at = ret;
6673         while (left > 0) {
6674                 /* Align data to the end */
6675                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6676                 if (error) {
6677         err_out_now:
6678                         sctp_m_freem(at);
6679                         return (NULL);
6680                 }
6681                 SCTP_BUF_LEN(at) = willcpy;
6682                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6683                 left -= willcpy;
6684                 if (left > 0) {
6685                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6686                         if (SCTP_BUF_NEXT(at) == NULL) {
6687                                 goto err_out_now;
6688                         }
6689                         at = SCTP_BUF_NEXT(at);
6690                         SCTP_BUF_LEN(at) = 0;
6691                         cancpy = M_TRAILINGSPACE(at);
6692                         willcpy = min(cancpy, left);
6693                 }
6694         }
6695         return (ret);
6696 }
6697
6698 static int
6699 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6700     struct sctp_sndrcvinfo *srcv)
6701 {
6702         int ret;
6703         struct sctp_copy_all *ca;
6704
6705         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6706             SCTP_M_COPYAL);
6707         if (ca == NULL) {
6708                 sctp_m_freem(m);
6709                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6710                 return (ENOMEM);
6711         }
6712         memset(ca, 0, sizeof(struct sctp_copy_all));
6713
6714         ca->inp = inp;
6715         if (srcv) {
6716                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6717         }
6718         /*
6719          * take off the sendall flag, it would be bad if we failed to do
6720          * this :-0
6721          */
6722         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6723         /* get length and mbuf chain */
6724         if (uio) {
6725                 ca->sndlen = uio->uio_resid;
6726                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6727                 if (ca->m == NULL) {
6728                         SCTP_FREE(ca, SCTP_M_COPYAL);
6729                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6730                         return (ENOMEM);
6731                 }
6732         } else {
6733                 /* Gather the length of the send */
6734                 struct mbuf *mat;
6735
6736                 mat = m;
6737                 ca->sndlen = 0;
6738                 while (m) {
6739                         ca->sndlen += SCTP_BUF_LEN(m);
6740                         m = SCTP_BUF_NEXT(m);
6741                 }
6742                 ca->m = mat;
6743         }
6744         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6745             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6746             SCTP_ASOC_ANY_STATE,
6747             (void *)ca, 0,
6748             sctp_sendall_completes, inp, 1);
6749         if (ret) {
6750                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6751                 SCTP_FREE(ca, SCTP_M_COPYAL);
6752                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6753                 return (EFAULT);
6754         }
6755         return (0);
6756 }
6757
6758
6759 void
6760 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6761 {
6762         struct sctp_tmit_chunk *chk, *nchk;
6763
6764         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6765                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6766                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6767                         if (chk->data) {
6768                                 sctp_m_freem(chk->data);
6769                                 chk->data = NULL;
6770                         }
6771                         asoc->ctrl_queue_cnt--;
6772                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6773                 }
6774         }
6775 }
6776
6777 void
6778 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6779 {
6780         struct sctp_association *asoc;
6781         struct sctp_tmit_chunk *chk, *nchk;
6782         struct sctp_asconf_chunk *acp;
6783
6784         asoc = &stcb->asoc;
6785         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6786                 /* find SCTP_ASCONF chunk in queue */
6787                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6788                         if (chk->data) {
6789                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6790                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6791                                         /* Not Acked yet */
6792                                         break;
6793                                 }
6794                         }
6795                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6796                         if (chk->data) {
6797                                 sctp_m_freem(chk->data);
6798                                 chk->data = NULL;
6799                         }
6800                         asoc->ctrl_queue_cnt--;
6801                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6802                 }
6803         }
6804 }
6805
6806
6807 static void
6808 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6809     struct sctp_association *asoc,
6810     struct sctp_tmit_chunk **data_list,
6811     int bundle_at,
6812     struct sctp_nets *net)
6813 {
6814         int i;
6815         struct sctp_tmit_chunk *tp1;
6816
6817         for (i = 0; i < bundle_at; i++) {
6818                 /* off of the send queue */
6819                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6820                 asoc->send_queue_cnt--;
6821                 if (i > 0) {
6822                         /*
6823                          * Any chunk NOT 0 you zap the time chunk 0 gets
6824                          * zapped or set based on if a RTO measurment is
6825                          * needed.
6826                          */
6827                         data_list[i]->do_rtt = 0;
6828                 }
6829                 /* record time */
6830                 data_list[i]->sent_rcv_time = net->last_sent_time;
6831                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6832                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6833                 if (data_list[i]->whoTo == NULL) {
6834                         data_list[i]->whoTo = net;
6835                         atomic_add_int(&net->ref_count, 1);
6836                 }
6837                 /* on to the sent queue */
6838                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6839                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6840                         struct sctp_tmit_chunk *tpp;
6841
6842                         /* need to move back */
6843         back_up_more:
6844                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6845                         if (tpp == NULL) {
6846                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6847                                 goto all_done;
6848                         }
6849                         tp1 = tpp;
6850                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6851                                 goto back_up_more;
6852                         }
6853                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6854                 } else {
6855                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6856                             data_list[i],
6857                             sctp_next);
6858                 }
6859 all_done:
6860                 /* This does not lower until the cum-ack passes it */
6861                 asoc->sent_queue_cnt++;
6862                 if ((asoc->peers_rwnd <= 0) &&
6863                     (asoc->total_flight == 0) &&
6864                     (bundle_at == 1)) {
6865                         /* Mark the chunk as being a window probe */
6866                         SCTP_STAT_INCR(sctps_windowprobed);
6867                 }
6868 #ifdef SCTP_AUDITING_ENABLED
6869                 sctp_audit_log(0xC2, 3);
6870 #endif
6871                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6872                 data_list[i]->snd_count = 1;
6873                 data_list[i]->rec.data.chunk_was_revoked = 0;
6874                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6875                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6876                             data_list[i]->whoTo->flight_size,
6877                             data_list[i]->book_size,
6878                             (uintptr_t) data_list[i]->whoTo,
6879                             data_list[i]->rec.data.TSN_seq);
6880                 }
6881                 sctp_flight_size_increase(data_list[i]);
6882                 sctp_total_flight_increase(stcb, data_list[i]);
6883                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6884                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6885                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6886                 }
6887                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6888                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6889                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6890                         /* SWS sender side engages */
6891                         asoc->peers_rwnd = 0;
6892                 }
6893         }
6894         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6895                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6896         }
6897 }
6898
6899 static void
6900 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6901 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6902     SCTP_UNUSED
6903 #endif
6904 )
6905 {
6906         struct sctp_tmit_chunk *chk, *nchk;
6907
6908         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6909                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6910                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6911                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6912                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6913                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6914                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6915                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6916                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6917                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6918                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6919                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6920                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6921                         /* Stray chunks must be cleaned up */
6922         clean_up_anyway:
6923                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6924                         if (chk->data) {
6925                                 sctp_m_freem(chk->data);
6926                                 chk->data = NULL;
6927                         }
6928                         asoc->ctrl_queue_cnt--;
6929                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
6930                                 asoc->fwd_tsn_cnt--;
6931                         sctp_free_a_chunk(stcb, chk, so_locked);
6932                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
6933                         /* special handling, we must look into the param */
6934                         if (chk != asoc->str_reset) {
6935                                 goto clean_up_anyway;
6936                         }
6937                 }
6938         }
6939 }
6940
6941
6942 static int
6943 sctp_can_we_split_this(struct sctp_tcb *stcb,
6944     uint32_t length,
6945     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
6946 {
6947         /*
6948          * Make a decision on if I should split a msg into multiple parts.
6949          * This is only asked of incomplete messages.
6950          */
6951         if (eeor_on) {
6952                 /*
6953                  * If we are doing EEOR we need to always send it if its the
6954                  * entire thing, since it might be all the guy is putting in
6955                  * the hopper.
6956                  */
6957                 if (goal_mtu >= length) {
6958                         /*-
6959                          * If we have data outstanding,
6960                          * we get another chance when the sack
6961                          * arrives to transmit - wait for more data
6962                          */
6963                         if (stcb->asoc.total_flight == 0) {
6964                                 /*
6965                                  * If nothing is in flight, we zero the
6966                                  * packet counter.
6967                                  */
6968                                 return (length);
6969                         }
6970                         return (0);
6971
6972                 } else {
6973                         /* You can fill the rest */
6974                         return (goal_mtu);
6975                 }
6976         }
6977         /*-
6978          * For those strange folk that make the send buffer
6979          * smaller than our fragmentation point, we can't
6980          * get a full msg in so we have to allow splitting.
6981          */
6982         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
6983                 return (length);
6984         }
6985         if ((length <= goal_mtu) ||
6986             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
6987                 /* Sub-optimial residual don't split in non-eeor mode. */
6988                 return (0);
6989         }
6990         /*
6991          * If we reach here length is larger than the goal_mtu. Do we wish
6992          * to split it for the sake of packet putting together?
6993          */
6994         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
6995                 /* Its ok to split it */
6996                 return (min(goal_mtu, frag_point));
6997         }
6998         /* Nope, can't split */
6999         return (0);
7000
7001 }
7002
7003 static uint32_t
7004 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7005     struct sctp_stream_out *strq,
7006     uint32_t goal_mtu,
7007     uint32_t frag_point,
7008     int *locked,
7009     int *giveup,
7010     int eeor_mode,
7011     int *bail,
7012     int so_locked
7013 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7014     SCTP_UNUSED
7015 #endif
7016 )
7017 {
7018         /* Move from the stream to the send_queue keeping track of the total */
7019         struct sctp_association *asoc;
7020         struct sctp_stream_queue_pending *sp;
7021         struct sctp_tmit_chunk *chk;
7022         struct sctp_data_chunk *dchkh;
7023         uint32_t to_move, length;
7024         uint8_t rcv_flags = 0;
7025         uint8_t some_taken;
7026         uint8_t send_lock_up = 0;
7027
7028         SCTP_TCB_LOCK_ASSERT(stcb);
7029         asoc = &stcb->asoc;
7030 one_more_time:
7031         /* sa_ignore FREED_MEMORY */
7032         sp = TAILQ_FIRST(&strq->outqueue);
7033         if (sp == NULL) {
7034                 *locked = 0;
7035                 if (send_lock_up == 0) {
7036                         SCTP_TCB_SEND_LOCK(stcb);
7037                         send_lock_up = 1;
7038                 }
7039                 sp = TAILQ_FIRST(&strq->outqueue);
7040                 if (sp) {
7041                         goto one_more_time;
7042                 }
7043                 if (strq->last_msg_incomplete) {
7044                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7045                             strq->stream_no,
7046                             strq->last_msg_incomplete);
7047                         strq->last_msg_incomplete = 0;
7048                 }
7049                 to_move = 0;
7050                 if (send_lock_up) {
7051                         SCTP_TCB_SEND_UNLOCK(stcb);
7052                         send_lock_up = 0;
7053                 }
7054                 goto out_of;
7055         }
7056         if ((sp->msg_is_complete) && (sp->length == 0)) {
7057                 if (sp->sender_all_done) {
7058                         /*
7059                          * We are doing differed cleanup. Last time through
7060                          * when we took all the data the sender_all_done was
7061                          * not set.
7062                          */
7063                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7064                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7065                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7066                                     sp->sender_all_done,
7067                                     sp->length,
7068                                     sp->msg_is_complete,
7069                                     sp->put_last_out,
7070                                     send_lock_up);
7071                         }
7072                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7073                                 SCTP_TCB_SEND_LOCK(stcb);
7074                                 send_lock_up = 1;
7075                         }
7076                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7077                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7078                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7079                         if (sp->net) {
7080                                 sctp_free_remote_addr(sp->net);
7081                                 sp->net = NULL;
7082                         }
7083                         if (sp->data) {
7084                                 sctp_m_freem(sp->data);
7085                                 sp->data = NULL;
7086                         }
7087                         sctp_free_a_strmoq(stcb, sp, so_locked);
7088                         /* we can't be locked to it */
7089                         *locked = 0;
7090                         stcb->asoc.locked_on_sending = NULL;
7091                         if (send_lock_up) {
7092                                 SCTP_TCB_SEND_UNLOCK(stcb);
7093                                 send_lock_up = 0;
7094                         }
7095                         /* back to get the next msg */
7096                         goto one_more_time;
7097                 } else {
7098                         /*
7099                          * sender just finished this but still holds a
7100                          * reference
7101                          */
7102                         *locked = 1;
7103                         *giveup = 1;
7104                         to_move = 0;
7105                         goto out_of;
7106                 }
7107         } else {
7108                 /* is there some to get */
7109                 if (sp->length == 0) {
7110                         /* no */
7111                         *locked = 1;
7112                         *giveup = 1;
7113                         to_move = 0;
7114                         goto out_of;
7115                 } else if (sp->discard_rest) {
7116                         if (send_lock_up == 0) {
7117                                 SCTP_TCB_SEND_LOCK(stcb);
7118                                 send_lock_up = 1;
7119                         }
7120                         /* Whack down the size */
7121                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7122                         if ((stcb->sctp_socket != NULL) && \
7123                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7124                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7125                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7126                         }
7127                         if (sp->data) {
7128                                 sctp_m_freem(sp->data);
7129                                 sp->data = NULL;
7130                                 sp->tail_mbuf = NULL;
7131                         }
7132                         sp->length = 0;
7133                         sp->some_taken = 1;
7134                         *locked = 1;
7135                         *giveup = 1;
7136                         to_move = 0;
7137                         goto out_of;
7138                 }
7139         }
7140         some_taken = sp->some_taken;
7141         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7142                 sp->msg_is_complete = 1;
7143         }
7144 re_look:
7145         length = sp->length;
7146         if (sp->msg_is_complete) {
7147                 /* The message is complete */
7148                 to_move = min(length, frag_point);
7149                 if (to_move == length) {
7150                         /* All of it fits in the MTU */
7151                         if (sp->some_taken) {
7152                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7153                                 sp->put_last_out = 1;
7154                         } else {
7155                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7156                                 sp->put_last_out = 1;
7157                         }
7158                 } else {
7159                         /* Not all of it fits, we fragment */
7160                         if (sp->some_taken == 0) {
7161                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7162                         }
7163                         sp->some_taken = 1;
7164                 }
7165         } else {
7166                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7167                 if (to_move) {
7168                         /*-
7169                          * We use a snapshot of length in case it
7170                          * is expanding during the compare.
7171                          */
7172                         uint32_t llen;
7173
7174                         llen = length;
7175                         if (to_move >= llen) {
7176                                 to_move = llen;
7177                                 if (send_lock_up == 0) {
7178                                         /*-
7179                                          * We are taking all of an incomplete msg
7180                                          * thus we need a send lock.
7181                                          */
7182                                         SCTP_TCB_SEND_LOCK(stcb);
7183                                         send_lock_up = 1;
7184                                         if (sp->msg_is_complete) {
7185                                                 /*
7186                                                  * the sender finished the
7187                                                  * msg
7188                                                  */
7189                                                 goto re_look;
7190                                         }
7191                                 }
7192                         }
7193                         if (sp->some_taken == 0) {
7194                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7195                                 sp->some_taken = 1;
7196                         }
7197                 } else {
7198                         /* Nothing to take. */
7199                         if (sp->some_taken) {
7200                                 *locked = 1;
7201                         }
7202                         *giveup = 1;
7203                         to_move = 0;
7204                         goto out_of;
7205                 }
7206         }
7207
7208         /* If we reach here, we can copy out a chunk */
7209         sctp_alloc_a_chunk(stcb, chk);
7210         if (chk == NULL) {
7211                 /* No chunk memory */
7212                 *giveup = 1;
7213                 to_move = 0;
7214                 goto out_of;
7215         }
7216         /*
7217          * Setup for unordered if needed by looking at the user sent info
7218          * flags.
7219          */
7220         if (sp->sinfo_flags & SCTP_UNORDERED) {
7221                 rcv_flags |= SCTP_DATA_UNORDERED;
7222         }
7223         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7224             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7225                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7226         }
7227         /* clear out the chunk before setting up */
7228         memset(chk, 0, sizeof(*chk));
7229         chk->rec.data.rcv_flags = rcv_flags;
7230
7231         if (to_move >= length) {
7232                 /* we think we can steal the whole thing */
7233                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7234                         SCTP_TCB_SEND_LOCK(stcb);
7235                         send_lock_up = 1;
7236                 }
7237                 if (to_move < sp->length) {
7238                         /* bail, it changed */
7239                         goto dont_do_it;
7240                 }
7241                 chk->data = sp->data;
7242                 chk->last_mbuf = sp->tail_mbuf;
7243                 /* register the stealing */
7244                 sp->data = sp->tail_mbuf = NULL;
7245         } else {
7246                 struct mbuf *m;
7247
7248 dont_do_it:
7249                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7250                 chk->last_mbuf = NULL;
7251                 if (chk->data == NULL) {
7252                         sp->some_taken = some_taken;
7253                         sctp_free_a_chunk(stcb, chk, so_locked);
7254                         *bail = 1;
7255                         to_move = 0;
7256                         goto out_of;
7257                 }
7258 #ifdef SCTP_MBUF_LOGGING
7259                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7260                         struct mbuf *mat;
7261
7262                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7263                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7264                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7265                                 }
7266                         }
7267                 }
7268 #endif
7269                 /* Pull off the data */
7270                 m_adj(sp->data, to_move);
7271                 /* Now lets work our way down and compact it */
7272                 m = sp->data;
7273                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7274                         sp->data = SCTP_BUF_NEXT(m);
7275                         SCTP_BUF_NEXT(m) = NULL;
7276                         if (sp->tail_mbuf == m) {
7277                                 /*-
7278                                  * Freeing tail? TSNH since
7279                                  * we supposedly were taking less
7280                                  * than the sp->length.
7281                                  */
7282 #ifdef INVARIANTS
7283                                 panic("Huh, freing tail? - TSNH");
7284 #else
7285                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7286                                 sp->tail_mbuf = sp->data = NULL;
7287                                 sp->length = 0;
7288 #endif
7289
7290                         }
7291                         sctp_m_free(m);
7292                         m = sp->data;
7293                 }
7294         }
7295         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7296                 chk->copy_by_ref = 1;
7297         } else {
7298                 chk->copy_by_ref = 0;
7299         }
7300         /*
7301          * get last_mbuf and counts of mb useage This is ugly but hopefully
7302          * its only one mbuf.
7303          */
7304         if (chk->last_mbuf == NULL) {
7305                 chk->last_mbuf = chk->data;
7306                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7307                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7308                 }
7309         }
7310         if (to_move > length) {
7311                 /*- This should not happen either
7312                  * since we always lower to_move to the size
7313                  * of sp->length if its larger.
7314                  */
7315 #ifdef INVARIANTS
7316                 panic("Huh, how can to_move be larger?");
7317 #else
7318                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7319                 sp->length = 0;
7320 #endif
7321         } else {
7322                 atomic_subtract_int(&sp->length, to_move);
7323         }
7324         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7325                 /* Not enough room for a chunk header, get some */
7326                 struct mbuf *m;
7327
7328                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7329                 if (m == NULL) {
7330                         /*
7331                          * we're in trouble here. _PREPEND below will free
7332                          * all the data if there is no leading space, so we
7333                          * must put the data back and restore.
7334                          */
7335                         if (send_lock_up == 0) {
7336                                 SCTP_TCB_SEND_LOCK(stcb);
7337                                 send_lock_up = 1;
7338                         }
7339                         if (chk->data == NULL) {
7340                                 /* unsteal the data */
7341                                 sp->data = chk->data;
7342                                 sp->tail_mbuf = chk->last_mbuf;
7343                         } else {
7344                                 struct mbuf *m_tmp;
7345
7346                                 /* reassemble the data */
7347                                 m_tmp = sp->data;
7348                                 sp->data = chk->data;
7349                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7350                         }
7351                         sp->some_taken = some_taken;
7352                         atomic_add_int(&sp->length, to_move);
7353                         chk->data = NULL;
7354                         *bail = 1;
7355                         sctp_free_a_chunk(stcb, chk, so_locked);
7356                         to_move = 0;
7357                         goto out_of;
7358                 } else {
7359                         SCTP_BUF_LEN(m) = 0;
7360                         SCTP_BUF_NEXT(m) = chk->data;
7361                         chk->data = m;
7362                         M_ALIGN(chk->data, 4);
7363                 }
7364         }
7365         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7366         if (chk->data == NULL) {
7367                 /* HELP, TSNH since we assured it would not above? */
7368 #ifdef INVARIANTS
7369                 panic("prepend failes HELP?");
7370 #else
7371                 SCTP_PRINTF("prepend fails HELP?\n");
7372                 sctp_free_a_chunk(stcb, chk, so_locked);
7373 #endif
7374                 *bail = 1;
7375                 to_move = 0;
7376                 goto out_of;
7377         }
7378         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7379         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7380         chk->book_size_scale = 0;
7381         chk->sent = SCTP_DATAGRAM_UNSENT;
7382
7383         chk->flags = 0;
7384         chk->asoc = &stcb->asoc;
7385         chk->pad_inplace = 0;
7386         chk->no_fr_allowed = 0;
7387         chk->rec.data.stream_seq = sp->strseq;
7388         chk->rec.data.stream_number = sp->stream;
7389         chk->rec.data.payloadtype = sp->ppid;
7390         chk->rec.data.context = sp->context;
7391         chk->rec.data.doing_fast_retransmit = 0;
7392
7393         chk->rec.data.timetodrop = sp->ts;
7394         chk->flags = sp->act_flags;
7395
7396         if (sp->net) {
7397                 chk->whoTo = sp->net;
7398                 atomic_add_int(&chk->whoTo->ref_count, 1);
7399         } else
7400                 chk->whoTo = NULL;
7401
7402         if (sp->holds_key_ref) {
7403                 chk->auth_keyid = sp->auth_keyid;
7404                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7405                 chk->holds_key_ref = 1;
7406         }
7407         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7408         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7409                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7410                     (uintptr_t) stcb, sp->length,
7411                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7412                     chk->rec.data.TSN_seq);
7413         }
7414         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7415         /*
7416          * Put the rest of the things in place now. Size was done earlier in
7417          * previous loop prior to padding.
7418          */
7419
7420 #ifdef SCTP_ASOCLOG_OF_TSNS
7421         SCTP_TCB_LOCK_ASSERT(stcb);
7422         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7423                 asoc->tsn_out_at = 0;
7424                 asoc->tsn_out_wrapped = 1;
7425         }
7426         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7427         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7428         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7429         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7430         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7431         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7432         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7433         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7434         asoc->tsn_out_at++;
7435 #endif
7436
7437         dchkh->ch.chunk_type = SCTP_DATA;
7438         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7439         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7440         dchkh->dp.stream_id = htons(strq->stream_no);
7441         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7442         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7443         dchkh->ch.chunk_length = htons(chk->send_size);
7444         /* Now advance the chk->send_size by the actual pad needed. */
7445         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7446                 /* need a pad */
7447                 struct mbuf *lm;
7448                 int pads;
7449
7450                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7451                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7452                         chk->pad_inplace = 1;
7453                 }
7454                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7455                         /* pad added an mbuf */
7456                         chk->last_mbuf = lm;
7457                 }
7458                 chk->send_size += pads;
7459         }
7460         /* We only re-set the policy if it is on */
7461         if (sp->pr_sctp_on) {
7462                 sctp_set_prsctp_policy(sp);
7463                 asoc->pr_sctp_cnt++;
7464                 chk->pr_sctp_on = 1;
7465         } else {
7466                 chk->pr_sctp_on = 0;
7467         }
7468         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7469                 /* All done pull and kill the message */
7470                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7471                 if (sp->put_last_out == 0) {
7472                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7473                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7474                             sp->sender_all_done,
7475                             sp->length,
7476                             sp->msg_is_complete,
7477                             sp->put_last_out,
7478                             send_lock_up);
7479                 }
7480                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7481                         SCTP_TCB_SEND_LOCK(stcb);
7482                         send_lock_up = 1;
7483                 }
7484                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7485                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7486                 if (sp->net) {
7487                         sctp_free_remote_addr(sp->net);
7488                         sp->net = NULL;
7489                 }
7490                 if (sp->data) {
7491                         sctp_m_freem(sp->data);
7492                         sp->data = NULL;
7493                 }
7494                 sctp_free_a_strmoq(stcb, sp, so_locked);
7495
7496                 /* we can't be locked to it */
7497                 *locked = 0;
7498                 stcb->asoc.locked_on_sending = NULL;
7499         } else {
7500                 /* more to go, we are locked */
7501                 *locked = 1;
7502         }
7503         asoc->chunks_on_out_queue++;
7504         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7505         asoc->send_queue_cnt++;
7506 out_of:
7507         if (send_lock_up) {
7508                 SCTP_TCB_SEND_UNLOCK(stcb);
7509         }
7510         return (to_move);
7511 }
7512
7513
7514 static void
7515 sctp_fill_outqueue(struct sctp_tcb *stcb,
7516     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7517 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7518     SCTP_UNUSED
7519 #endif
7520 )
7521 {
7522         struct sctp_association *asoc;
7523         struct sctp_stream_out *strq;
7524         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7525         int locked, giveup;
7526
7527         SCTP_TCB_LOCK_ASSERT(stcb);
7528         asoc = &stcb->asoc;
7529         switch (net->ro._l_addr.sa.sa_family) {
7530 #ifdef INET
7531         case AF_INET:
7532                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7533                 break;
7534 #endif
7535 #ifdef INET6
7536         case AF_INET6:
7537                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7538                 break;
7539 #endif
7540         default:
7541                 /* TSNH */
7542                 goal_mtu = net->mtu;
7543                 break;
7544         }
7545         /* Need an allowance for the data chunk header too */
7546         goal_mtu -= sizeof(struct sctp_data_chunk);
7547
7548         /* must make even word boundary */
7549         goal_mtu &= 0xfffffffc;
7550         if (asoc->locked_on_sending) {
7551                 /* We are stuck on one stream until the message completes. */
7552                 strq = asoc->locked_on_sending;
7553                 locked = 1;
7554         } else {
7555                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7556                 locked = 0;
7557         }
7558         while ((goal_mtu > 0) && strq) {
7559                 giveup = 0;
7560                 bail = 0;
7561                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7562                     &giveup, eeor_mode, &bail, so_locked);
7563                 if (moved_how_much)
7564                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7565
7566                 if (locked) {
7567                         asoc->locked_on_sending = strq;
7568                         if ((moved_how_much == 0) || (giveup) || bail)
7569                                 /* no more to move for now */
7570                                 break;
7571                 } else {
7572                         asoc->locked_on_sending = NULL;
7573                         if ((giveup) || bail) {
7574                                 break;
7575                         }
7576                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7577                         if (strq == NULL) {
7578                                 break;
7579                         }
7580                 }
7581                 total_moved += moved_how_much;
7582                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7583                 goal_mtu &= 0xfffffffc;
7584         }
7585         if (bail)
7586                 *quit_now = 1;
7587
7588         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7589
7590         if (total_moved == 0) {
7591                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7592                     (net == stcb->asoc.primary_destination)) {
7593                         /* ran dry for primary network net */
7594                         SCTP_STAT_INCR(sctps_primary_randry);
7595                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7596                         /* ran dry with CMT on */
7597                         SCTP_STAT_INCR(sctps_cmt_randry);
7598                 }
7599         }
7600 }
7601
7602 void
7603 sctp_fix_ecn_echo(struct sctp_association *asoc)
7604 {
7605         struct sctp_tmit_chunk *chk;
7606
7607         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7608                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7609                         chk->sent = SCTP_DATAGRAM_UNSENT;
7610                 }
7611         }
7612 }
7613
7614 void
7615 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7616 {
7617         struct sctp_association *asoc;
7618         struct sctp_tmit_chunk *chk;
7619         struct sctp_stream_queue_pending *sp;
7620         unsigned int i;
7621
7622         if (net == NULL) {
7623                 return;
7624         }
7625         asoc = &stcb->asoc;
7626         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7627                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7628                         if (sp->net == net) {
7629                                 sctp_free_remote_addr(sp->net);
7630                                 sp->net = NULL;
7631                         }
7632                 }
7633         }
7634         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7635                 if (chk->whoTo == net) {
7636                         sctp_free_remote_addr(chk->whoTo);
7637                         chk->whoTo = NULL;
7638                 }
7639         }
7640 }
7641
7642 int
7643 sctp_med_chunk_output(struct sctp_inpcb *inp,
7644     struct sctp_tcb *stcb,
7645     struct sctp_association *asoc,
7646     int *num_out,
7647     int *reason_code,
7648     int control_only, int from_where,
7649     struct timeval *now, int *now_filled, int frag_point, int so_locked
7650 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7651     SCTP_UNUSED
7652 #endif
7653 )
7654 {
7655         /*
7656          * Ok this is the generic chunk service queue. we must do the
7657          * following: - Service the stream queue that is next, moving any
7658          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7659          * LAST to the out queue in one pass) and assigning TSN's - Check to
7660          * see if the cwnd/rwnd allows any output, if so we go ahead and
7661          * fomulate and send the low level chunks. Making sure to combine
7662          * any control in the control chunk queue also.
7663          */
7664         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7665         struct mbuf *outchain, *endoutchain;
7666         struct sctp_tmit_chunk *chk, *nchk;
7667
7668         /* temp arrays for unlinking */
7669         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7670         int no_fragmentflg, error;
7671         unsigned int max_rwnd_per_dest, max_send_per_dest;
7672         int one_chunk, hbflag, skip_data_for_this_net;
7673         int asconf, cookie, no_out_cnt;
7674         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7675         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7676         int tsns_sent = 0;
7677         uint32_t auth_offset = 0;
7678         struct sctp_auth_chunk *auth = NULL;
7679         uint16_t auth_keyid;
7680         int override_ok = 1;
7681         int skip_fill_up = 0;
7682         int data_auth_reqd = 0;
7683
7684         /*
7685          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7686          * destination.
7687          */
7688         int quit_now = 0;
7689
7690         *num_out = 0;
7691         auth_keyid = stcb->asoc.authinfo.active_keyid;
7692
7693         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7694             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7695             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7696                 eeor_mode = 1;
7697         } else {
7698                 eeor_mode = 0;
7699         }
7700         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7701         /*
7702          * First lets prime the pump. For each destination, if there is room
7703          * in the flight size, attempt to pull an MTU's worth out of the
7704          * stream queues into the general send_queue
7705          */
7706 #ifdef SCTP_AUDITING_ENABLED
7707         sctp_audit_log(0xC2, 2);
7708 #endif
7709         SCTP_TCB_LOCK_ASSERT(stcb);
7710         hbflag = 0;
7711         if ((control_only) || (asoc->stream_reset_outstanding))
7712                 no_data_chunks = 1;
7713         else
7714                 no_data_chunks = 0;
7715
7716         /* Nothing to possible to send? */
7717         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7718             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7719             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7720             TAILQ_EMPTY(&asoc->send_queue) &&
7721             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7722 nothing_to_send:
7723                 *reason_code = 9;
7724                 return (0);
7725         }
7726         if (asoc->peers_rwnd == 0) {
7727                 /* No room in peers rwnd */
7728                 *reason_code = 1;
7729                 if (asoc->total_flight > 0) {
7730                         /* we are allowed one chunk in flight */
7731                         no_data_chunks = 1;
7732                 }
7733         }
7734         if (stcb->asoc.ecn_echo_cnt_onq) {
7735                 /* Record where a sack goes, if any */
7736                 if (no_data_chunks &&
7737                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7738                         /* Nothing but ECNe to send - we don't do that */
7739                         goto nothing_to_send;
7740                 }
7741                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7742                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7743                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7744                                 sack_goes_to = chk->whoTo;
7745                                 break;
7746                         }
7747                 }
7748         }
7749         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7750         if (stcb->sctp_socket)
7751                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7752         else
7753                 max_send_per_dest = 0;
7754         if (no_data_chunks == 0) {
7755                 /* How many non-directed chunks are there? */
7756                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7757                         if (chk->whoTo == NULL) {
7758                                 /*
7759                                  * We already have non-directed chunks on
7760                                  * the queue, no need to do a fill-up.
7761                                  */
7762                                 skip_fill_up = 1;
7763                                 break;
7764                         }
7765                 }
7766
7767         }
7768         if ((no_data_chunks == 0) &&
7769             (skip_fill_up == 0) &&
7770             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7771                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7772                         /*
7773                          * This for loop we are in takes in each net, if
7774                          * its's got space in cwnd and has data sent to it
7775                          * (when CMT is off) then it calls
7776                          * sctp_fill_outqueue for the net. This gets data on
7777                          * the send queue for that network.
7778                          *
7779                          * In sctp_fill_outqueue TSN's are assigned and data is
7780                          * copied out of the stream buffers. Note mostly
7781                          * copy by reference (we hope).
7782                          */
7783                         net->window_probe = 0;
7784                         if ((net != stcb->asoc.alternate) &&
7785                             ((net->dest_state & SCTP_ADDR_PF) ||
7786                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7787                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7788                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7789                                         sctp_log_cwnd(stcb, net, 1,
7790                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7791                                 }
7792                                 continue;
7793                         }
7794                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7795                             (net->flight_size == 0)) {
7796                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7797                         }
7798                         if (net->flight_size >= net->cwnd) {
7799                                 /* skip this network, no room - can't fill */
7800                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7801                                         sctp_log_cwnd(stcb, net, 3,
7802                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7803                                 }
7804                                 continue;
7805                         }
7806                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7807                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7808                         }
7809                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7810                         if (quit_now) {
7811                                 /* memory alloc failure */
7812                                 no_data_chunks = 1;
7813                                 break;
7814                         }
7815                 }
7816         }
7817         /* now service each destination and send out what we can for it */
7818         /* Nothing to send? */
7819         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7820             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7821             TAILQ_EMPTY(&asoc->send_queue)) {
7822                 *reason_code = 8;
7823                 return (0);
7824         }
7825         if (asoc->sctp_cmt_on_off > 0) {
7826                 /* get the last start point */
7827                 start_at = asoc->last_net_cmt_send_started;
7828                 if (start_at == NULL) {
7829                         /* null so to beginning */
7830                         start_at = TAILQ_FIRST(&asoc->nets);
7831                 } else {
7832                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7833                         if (start_at == NULL) {
7834                                 start_at = TAILQ_FIRST(&asoc->nets);
7835                         }
7836                 }
7837                 asoc->last_net_cmt_send_started = start_at;
7838         } else {
7839                 start_at = TAILQ_FIRST(&asoc->nets);
7840         }
7841         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7842                 if (chk->whoTo == NULL) {
7843                         if (asoc->alternate) {
7844                                 chk->whoTo = asoc->alternate;
7845                         } else {
7846                                 chk->whoTo = asoc->primary_destination;
7847                         }
7848                         atomic_add_int(&chk->whoTo->ref_count, 1);
7849                 }
7850         }
7851         old_start_at = NULL;
7852 again_one_more_time:
7853         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7854                 /* how much can we send? */
7855                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7856                 if (old_start_at && (old_start_at == net)) {
7857                         /* through list ocmpletely. */
7858                         break;
7859                 }
7860                 tsns_sent = 0xa;
7861                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7862                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7863                     (net->flight_size >= net->cwnd)) {
7864                         /*
7865                          * Nothing on control or asconf and flight is full,
7866                          * we can skip even in the CMT case.
7867                          */
7868                         continue;
7869                 }
7870                 bundle_at = 0;
7871                 endoutchain = outchain = NULL;
7872                 no_fragmentflg = 1;
7873                 one_chunk = 0;
7874                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7875                         skip_data_for_this_net = 1;
7876                 } else {
7877                         skip_data_for_this_net = 0;
7878                 }
7879                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7880                         /*
7881                          * if we have a route and an ifp check to see if we
7882                          * have room to send to this guy
7883                          */
7884                         struct ifnet *ifp;
7885
7886                         ifp = net->ro.ro_rt->rt_ifp;
7887                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7888                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7889                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7890                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7891                                 }
7892                                 continue;
7893                         }
7894                 }
7895                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7896 #ifdef INET
7897                 case AF_INET:
7898                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7899                         break;
7900 #endif
7901 #ifdef INET6
7902                 case AF_INET6:
7903                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7904                         break;
7905 #endif
7906                 default:
7907                         /* TSNH */
7908                         mtu = net->mtu;
7909                         break;
7910                 }
7911                 mx_mtu = mtu;
7912                 to_out = 0;
7913                 if (mtu > asoc->peers_rwnd) {
7914                         if (asoc->total_flight > 0) {
7915                                 /* We have a packet in flight somewhere */
7916                                 r_mtu = asoc->peers_rwnd;
7917                         } else {
7918                                 /* We are always allowed to send one MTU out */
7919                                 one_chunk = 1;
7920                                 r_mtu = mtu;
7921                         }
7922                 } else {
7923                         r_mtu = mtu;
7924                 }
7925                 /************************/
7926                 /* ASCONF transmission */
7927                 /************************/
7928                 /* Now first lets go through the asconf queue */
7929                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
7930                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
7931                                 continue;
7932                         }
7933                         if (chk->whoTo == NULL) {
7934                                 if (asoc->alternate == NULL) {
7935                                         if (asoc->primary_destination != net) {
7936                                                 break;
7937                                         }
7938                                 } else {
7939                                         if (asoc->alternate != net) {
7940                                                 break;
7941                                         }
7942                                 }
7943                         } else {
7944                                 if (chk->whoTo != net) {
7945                                         break;
7946                                 }
7947                         }
7948                         if (chk->data == NULL) {
7949                                 break;
7950                         }
7951                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
7952                             chk->sent != SCTP_DATAGRAM_RESEND) {
7953                                 break;
7954                         }
7955                         /*
7956                          * if no AUTH is yet included and this chunk
7957                          * requires it, make sure to account for it.  We
7958                          * don't apply the size until the AUTH chunk is
7959                          * actually added below in case there is no room for
7960                          * this chunk. NOTE: we overload the use of "omtu"
7961                          * here
7962                          */
7963                         if ((auth == NULL) &&
7964                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7965                             stcb->asoc.peer_auth_chunks)) {
7966                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
7967                         } else
7968                                 omtu = 0;
7969                         /* Here we do NOT factor the r_mtu */
7970                         if ((chk->send_size < (int)(mtu - omtu)) ||
7971                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
7972                                 /*
7973                                  * We probably should glom the mbuf chain
7974                                  * from the chk->data for control but the
7975                                  * problem is it becomes yet one more level
7976                                  * of tracking to do if for some reason
7977                                  * output fails. Then I have got to
7978                                  * reconstruct the merged control chain.. el
7979                                  * yucko.. for now we take the easy way and
7980                                  * do the copy
7981                                  */
7982                                 /*
7983                                  * Add an AUTH chunk, if chunk requires it
7984                                  * save the offset into the chain for AUTH
7985                                  */
7986                                 if ((auth == NULL) &&
7987                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
7988                                     stcb->asoc.peer_auth_chunks))) {
7989                                         outchain = sctp_add_auth_chunk(outchain,
7990                                             &endoutchain,
7991                                             &auth,
7992                                             &auth_offset,
7993                                             stcb,
7994                                             chk->rec.chunk_id.id);
7995                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
7996                                 }
7997                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
7998                                     (int)chk->rec.chunk_id.can_take_data,
7999                                     chk->send_size, chk->copy_by_ref);
8000                                 if (outchain == NULL) {
8001                                         *reason_code = 8;
8002                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8003                                         return (ENOMEM);
8004                                 }
8005                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8006                                 /* update our MTU size */
8007                                 if (mtu > (chk->send_size + omtu))
8008                                         mtu -= (chk->send_size + omtu);
8009                                 else
8010                                         mtu = 0;
8011                                 to_out += (chk->send_size + omtu);
8012                                 /* Do clear IP_DF ? */
8013                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8014                                         no_fragmentflg = 0;
8015                                 }
8016                                 if (chk->rec.chunk_id.can_take_data)
8017                                         chk->data = NULL;
8018                                 /*
8019                                  * set hb flag since we can use these for
8020                                  * RTO
8021                                  */
8022                                 hbflag = 1;
8023                                 asconf = 1;
8024                                 /*
8025                                  * should sysctl this: don't bundle data
8026                                  * with ASCONF since it requires AUTH
8027                                  */
8028                                 no_data_chunks = 1;
8029                                 chk->sent = SCTP_DATAGRAM_SENT;
8030                                 if (chk->whoTo == NULL) {
8031                                         chk->whoTo = net;
8032                                         atomic_add_int(&net->ref_count, 1);
8033                                 }
8034                                 chk->snd_count++;
8035                                 if (mtu == 0) {
8036                                         /*
8037                                          * Ok we are out of room but we can
8038                                          * output without effecting the
8039                                          * flight size since this little guy
8040                                          * is a control only packet.
8041                                          */
8042                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8043                                         /*
8044                                          * do NOT clear the asconf flag as
8045                                          * it is used to do appropriate
8046                                          * source address selection.
8047                                          */
8048                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8049                                             (struct sockaddr *)&net->ro._l_addr,
8050                                             outchain, auth_offset, auth,
8051                                             stcb->asoc.authinfo.active_keyid,
8052                                             no_fragmentflg, 0, asconf,
8053                                             inp->sctp_lport, stcb->rport,
8054                                             htonl(stcb->asoc.peer_vtag),
8055                                             net->port, NULL,
8056                                             0, 0,
8057                                             so_locked))) {
8058                                                 if (error == ENOBUFS) {
8059                                                         asoc->ifp_had_enobuf = 1;
8060                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8061                                                 }
8062                                                 if (from_where == 0) {
8063                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8064                                                 }
8065                                                 if (*now_filled == 0) {
8066                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8067                                                         *now_filled = 1;
8068                                                         *now = net->last_sent_time;
8069                                                 } else {
8070                                                         net->last_sent_time = *now;
8071                                                 }
8072                                                 hbflag = 0;
8073                                                 /* error, could not output */
8074                                                 if (error == EHOSTUNREACH) {
8075                                                         /*
8076                                                          * Destination went
8077                                                          * unreachable
8078                                                          * during this send
8079                                                          */
8080                                                         sctp_move_chunks_from_net(stcb, net);
8081                                                 }
8082                                                 *reason_code = 7;
8083                                                 continue;
8084                                         } else
8085                                                 asoc->ifp_had_enobuf = 0;
8086                                         if (*now_filled == 0) {
8087                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8088                                                 *now_filled = 1;
8089                                                 *now = net->last_sent_time;
8090                                         } else {
8091                                                 net->last_sent_time = *now;
8092                                         }
8093                                         hbflag = 0;
8094                                         /*
8095                                          * increase the number we sent, if a
8096                                          * cookie is sent we don't tell them
8097                                          * any was sent out.
8098                                          */
8099                                         outchain = endoutchain = NULL;
8100                                         auth = NULL;
8101                                         auth_offset = 0;
8102                                         if (!no_out_cnt)
8103                                                 *num_out += ctl_cnt;
8104                                         /* recalc a clean slate and setup */
8105                                         switch (net->ro._l_addr.sa.sa_family) {
8106 #ifdef INET
8107                                         case AF_INET:
8108                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8109                                                 break;
8110 #endif
8111 #ifdef INET6
8112                                         case AF_INET6:
8113                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8114                                                 break;
8115 #endif
8116                                         default:
8117                                                 /* TSNH */
8118                                                 mtu = net->mtu;
8119                                                 break;
8120                                         }
8121                                         to_out = 0;
8122                                         no_fragmentflg = 1;
8123                                 }
8124                         }
8125                 }
8126                 /************************/
8127                 /* Control transmission */
8128                 /************************/
8129                 /* Now first lets go through the control queue */
8130                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8131                         if ((sack_goes_to) &&
8132                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8133                             (chk->whoTo != sack_goes_to)) {
8134                                 /*
8135                                  * if we have a sack in queue, and we are
8136                                  * looking at an ecn echo that is NOT queued
8137                                  * to where the sack is going..
8138                                  */
8139                                 if (chk->whoTo == net) {
8140                                         /*
8141                                          * Don't transmit it to where its
8142                                          * going (current net)
8143                                          */
8144                                         continue;
8145                                 } else if (sack_goes_to == net) {
8146                                         /*
8147                                          * But do transmit it to this
8148                                          * address
8149                                          */
8150                                         goto skip_net_check;
8151                                 }
8152                         }
8153                         if (chk->whoTo == NULL) {
8154                                 if (asoc->alternate == NULL) {
8155                                         if (asoc->primary_destination != net) {
8156                                                 continue;
8157                                         }
8158                                 } else {
8159                                         if (asoc->alternate != net) {
8160                                                 continue;
8161                                         }
8162                                 }
8163                         } else {
8164                                 if (chk->whoTo != net) {
8165                                         continue;
8166                                 }
8167                         }
8168         skip_net_check:
8169                         if (chk->data == NULL) {
8170                                 continue;
8171                         }
8172                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8173                                 /*
8174                                  * It must be unsent. Cookies and ASCONF's
8175                                  * hang around but there timers will force
8176                                  * when marked for resend.
8177                                  */
8178                                 continue;
8179                         }
8180                         /*
8181                          * if no AUTH is yet included and this chunk
8182                          * requires it, make sure to account for it.  We
8183                          * don't apply the size until the AUTH chunk is
8184                          * actually added below in case there is no room for
8185                          * this chunk. NOTE: we overload the use of "omtu"
8186                          * here
8187                          */
8188                         if ((auth == NULL) &&
8189                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8190                             stcb->asoc.peer_auth_chunks)) {
8191                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8192                         } else
8193                                 omtu = 0;
8194                         /* Here we do NOT factor the r_mtu */
8195                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8196                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8197                                 /*
8198                                  * We probably should glom the mbuf chain
8199                                  * from the chk->data for control but the
8200                                  * problem is it becomes yet one more level
8201                                  * of tracking to do if for some reason
8202                                  * output fails. Then I have got to
8203                                  * reconstruct the merged control chain.. el
8204                                  * yucko.. for now we take the easy way and
8205                                  * do the copy
8206                                  */
8207                                 /*
8208                                  * Add an AUTH chunk, if chunk requires it
8209                                  * save the offset into the chain for AUTH
8210                                  */
8211                                 if ((auth == NULL) &&
8212                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8213                                     stcb->asoc.peer_auth_chunks))) {
8214                                         outchain = sctp_add_auth_chunk(outchain,
8215                                             &endoutchain,
8216                                             &auth,
8217                                             &auth_offset,
8218                                             stcb,
8219                                             chk->rec.chunk_id.id);
8220                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8221                                 }
8222                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8223                                     (int)chk->rec.chunk_id.can_take_data,
8224                                     chk->send_size, chk->copy_by_ref);
8225                                 if (outchain == NULL) {
8226                                         *reason_code = 8;
8227                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8228                                         return (ENOMEM);
8229                                 }
8230                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8231                                 /* update our MTU size */
8232                                 if (mtu > (chk->send_size + omtu))
8233                                         mtu -= (chk->send_size + omtu);
8234                                 else
8235                                         mtu = 0;
8236                                 to_out += (chk->send_size + omtu);
8237                                 /* Do clear IP_DF ? */
8238                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8239                                         no_fragmentflg = 0;
8240                                 }
8241                                 if (chk->rec.chunk_id.can_take_data)
8242                                         chk->data = NULL;
8243                                 /* Mark things to be removed, if needed */
8244                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8245                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8246                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8247                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8248                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8249                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8250                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8251                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8252                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8253                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8254                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8255                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8256                                                 hbflag = 1;
8257                                         }
8258                                         /* remove these chunks at the end */
8259                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8260                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8261                                                 /* turn off the timer */
8262                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8263                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8264                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8265                                                 }
8266                                         }
8267                                         ctl_cnt++;
8268                                 } else {
8269                                         /*
8270                                          * Other chunks, since they have
8271                                          * timers running (i.e. COOKIE) we
8272                                          * just "trust" that it gets sent or
8273                                          * retransmitted.
8274                                          */
8275                                         ctl_cnt++;
8276                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8277                                                 cookie = 1;
8278                                                 no_out_cnt = 1;
8279                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8280                                                 /*
8281                                                  * Increment ecne send count
8282                                                  * here this means we may be
8283                                                  * over-zealous in our
8284                                                  * counting if the send
8285                                                  * fails, but its the best
8286                                                  * place to do it (we used
8287                                                  * to do it in the queue of
8288                                                  * the chunk, but that did
8289                                                  * not tell how many times
8290                                                  * it was sent.
8291                                                  */
8292                                                 SCTP_STAT_INCR(sctps_sendecne);
8293                                         }
8294                                         chk->sent = SCTP_DATAGRAM_SENT;
8295                                         if (chk->whoTo == NULL) {
8296                                                 chk->whoTo = net;
8297                                                 atomic_add_int(&net->ref_count, 1);
8298                                         }
8299                                         chk->snd_count++;
8300                                 }
8301                                 if (mtu == 0) {
8302                                         /*
8303                                          * Ok we are out of room but we can
8304                                          * output without effecting the
8305                                          * flight size since this little guy
8306                                          * is a control only packet.
8307                                          */
8308                                         if (asconf) {
8309                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8310                                                 /*
8311                                                  * do NOT clear the asconf
8312                                                  * flag as it is used to do
8313                                                  * appropriate source
8314                                                  * address selection.
8315                                                  */
8316                                         }
8317                                         if (cookie) {
8318                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8319                                                 cookie = 0;
8320                                         }
8321                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8322                                             (struct sockaddr *)&net->ro._l_addr,
8323                                             outchain,
8324                                             auth_offset, auth,
8325                                             stcb->asoc.authinfo.active_keyid,
8326                                             no_fragmentflg, 0, asconf,
8327                                             inp->sctp_lport, stcb->rport,
8328                                             htonl(stcb->asoc.peer_vtag),
8329                                             net->port, NULL,
8330                                             0, 0,
8331                                             so_locked))) {
8332                                                 if (error == ENOBUFS) {
8333                                                         asoc->ifp_had_enobuf = 1;
8334                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8335                                                 }
8336                                                 if (from_where == 0) {
8337                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8338                                                 }
8339                                                 /* error, could not output */
8340                                                 if (hbflag) {
8341                                                         if (*now_filled == 0) {
8342                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8343                                                                 *now_filled = 1;
8344                                                                 *now = net->last_sent_time;
8345                                                         } else {
8346                                                                 net->last_sent_time = *now;
8347                                                         }
8348                                                         hbflag = 0;
8349                                                 }
8350                                                 if (error == EHOSTUNREACH) {
8351                                                         /*
8352                                                          * Destination went
8353                                                          * unreachable
8354                                                          * during this send
8355                                                          */
8356                                                         sctp_move_chunks_from_net(stcb, net);
8357                                                 }
8358                                                 *reason_code = 7;
8359                                                 continue;
8360                                         } else
8361                                                 asoc->ifp_had_enobuf = 0;
8362                                         /* Only HB or ASCONF advances time */
8363                                         if (hbflag) {
8364                                                 if (*now_filled == 0) {
8365                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8366                                                         *now_filled = 1;
8367                                                         *now = net->last_sent_time;
8368                                                 } else {
8369                                                         net->last_sent_time = *now;
8370                                                 }
8371                                                 hbflag = 0;
8372                                         }
8373                                         /*
8374                                          * increase the number we sent, if a
8375                                          * cookie is sent we don't tell them
8376                                          * any was sent out.
8377                                          */
8378                                         outchain = endoutchain = NULL;
8379                                         auth = NULL;
8380                                         auth_offset = 0;
8381                                         if (!no_out_cnt)
8382                                                 *num_out += ctl_cnt;
8383                                         /* recalc a clean slate and setup */
8384                                         switch (net->ro._l_addr.sa.sa_family) {
8385 #ifdef INET
8386                                         case AF_INET:
8387                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8388                                                 break;
8389 #endif
8390 #ifdef INET6
8391                                         case AF_INET6:
8392                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8393                                                 break;
8394 #endif
8395                                         default:
8396                                                 /* TSNH */
8397                                                 mtu = net->mtu;
8398                                                 break;
8399                                         }
8400                                         to_out = 0;
8401                                         no_fragmentflg = 1;
8402                                 }
8403                         }
8404                 }
8405                 /* JRI: if dest is in PF state, do not send data to it */
8406                 if ((asoc->sctp_cmt_on_off > 0) &&
8407                     (net != stcb->asoc.alternate) &&
8408                     (net->dest_state & SCTP_ADDR_PF)) {
8409                         goto no_data_fill;
8410                 }
8411                 if (net->flight_size >= net->cwnd) {
8412                         goto no_data_fill;
8413                 }
8414                 if ((asoc->sctp_cmt_on_off > 0) &&
8415                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8416                     (net->flight_size > max_rwnd_per_dest)) {
8417                         goto no_data_fill;
8418                 }
8419                 /*
8420                  * We need a specific accounting for the usage of the send
8421                  * buffer. We also need to check the number of messages per
8422                  * net. For now, this is better than nothing and it disabled
8423                  * by default...
8424                  */
8425                 if ((asoc->sctp_cmt_on_off > 0) &&
8426                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8427                     (max_send_per_dest > 0) &&
8428                     (net->flight_size > max_send_per_dest)) {
8429                         goto no_data_fill;
8430                 }
8431                 /*********************/
8432                 /* Data transmission */
8433                 /*********************/
8434                 /*
8435                  * if AUTH for DATA is required and no AUTH has been added
8436                  * yet, account for this in the mtu now... if no data can be
8437                  * bundled, this adjustment won't matter anyways since the
8438                  * packet will be going out...
8439                  */
8440                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8441                     stcb->asoc.peer_auth_chunks);
8442                 if (data_auth_reqd && (auth == NULL)) {
8443                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8444                 }
8445                 /* now lets add any data within the MTU constraints */
8446                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8447 #ifdef INET
8448                 case AF_INET:
8449                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8450                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8451                         else
8452                                 omtu = 0;
8453                         break;
8454 #endif
8455 #ifdef INET6
8456                 case AF_INET6:
8457                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8458                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8459                         else
8460                                 omtu = 0;
8461                         break;
8462 #endif
8463                 default:
8464                         /* TSNH */
8465                         omtu = 0;
8466                         break;
8467                 }
8468                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8469                     (skip_data_for_this_net == 0)) ||
8470                     (cookie)) {
8471                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8472                                 if (no_data_chunks) {
8473                                         /* let only control go out */
8474                                         *reason_code = 1;
8475                                         break;
8476                                 }
8477                                 if (net->flight_size >= net->cwnd) {
8478                                         /* skip this net, no room for data */
8479                                         *reason_code = 2;
8480                                         break;
8481                                 }
8482                                 if ((chk->whoTo != NULL) &&
8483                                     (chk->whoTo != net)) {
8484                                         /* Don't send the chunk on this net */
8485                                         continue;
8486                                 }
8487                                 if (asoc->sctp_cmt_on_off == 0) {
8488                                         if ((asoc->alternate) &&
8489                                             (asoc->alternate != net) &&
8490                                             (chk->whoTo == NULL)) {
8491                                                 continue;
8492                                         } else if ((net != asoc->primary_destination) &&
8493                                                     (asoc->alternate == NULL) &&
8494                                             (chk->whoTo == NULL)) {
8495                                                 continue;
8496                                         }
8497                                 }
8498                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8499                                         /*-
8500                                          * strange, we have a chunk that is
8501                                          * to big for its destination and
8502                                          * yet no fragment ok flag.
8503                                          * Something went wrong when the
8504                                          * PMTU changed...we did not mark
8505                                          * this chunk for some reason?? I
8506                                          * will fix it here by letting IP
8507                                          * fragment it for now and printing
8508                                          * a warning. This really should not
8509                                          * happen ...
8510                                          */
8511                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8512                                             chk->send_size, mtu);
8513                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8514                                 }
8515                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8516                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8517                                         struct sctp_data_chunk *dchkh;
8518
8519                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8520                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8521                                 }
8522                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8523                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8524                                         /* ok we will add this one */
8525
8526                                         /*
8527                                          * Add an AUTH chunk, if chunk
8528                                          * requires it, save the offset into
8529                                          * the chain for AUTH
8530                                          */
8531                                         if (data_auth_reqd) {
8532                                                 if (auth == NULL) {
8533                                                         outchain = sctp_add_auth_chunk(outchain,
8534                                                             &endoutchain,
8535                                                             &auth,
8536                                                             &auth_offset,
8537                                                             stcb,
8538                                                             SCTP_DATA);
8539                                                         auth_keyid = chk->auth_keyid;
8540                                                         override_ok = 0;
8541                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8542                                                 } else if (override_ok) {
8543                                                         /*
8544                                                          * use this data's
8545                                                          * keyid
8546                                                          */
8547                                                         auth_keyid = chk->auth_keyid;
8548                                                         override_ok = 0;
8549                                                 } else if (auth_keyid != chk->auth_keyid) {
8550                                                         /*
8551                                                          * different keyid,
8552                                                          * so done bundling
8553                                                          */
8554                                                         break;
8555                                                 }
8556                                         }
8557                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8558                                             chk->send_size, chk->copy_by_ref);
8559                                         if (outchain == NULL) {
8560                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8561                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8562                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8563                                                 }
8564                                                 *reason_code = 3;
8565                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8566                                                 return (ENOMEM);
8567                                         }
8568                                         /* upate our MTU size */
8569                                         /* Do clear IP_DF ? */
8570                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8571                                                 no_fragmentflg = 0;
8572                                         }
8573                                         /* unsigned subtraction of mtu */
8574                                         if (mtu > chk->send_size)
8575                                                 mtu -= chk->send_size;
8576                                         else
8577                                                 mtu = 0;
8578                                         /* unsigned subtraction of r_mtu */
8579                                         if (r_mtu > chk->send_size)
8580                                                 r_mtu -= chk->send_size;
8581                                         else
8582                                                 r_mtu = 0;
8583
8584                                         to_out += chk->send_size;
8585                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8586 #ifdef INVARIANTS
8587                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8588 #else
8589                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8590                                                     mx_mtu, to_out);
8591 #endif
8592                                         }
8593                                         chk->window_probe = 0;
8594                                         data_list[bundle_at++] = chk;
8595                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8596                                                 break;
8597                                         }
8598                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8599                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8600                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8601                                                 } else {
8602                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8603                                                 }
8604                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8605                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8606                                                         /*
8607                                                          * Count number of
8608                                                          * user msg's that
8609                                                          * were fragmented
8610                                                          * we do this by
8611                                                          * counting when we
8612                                                          * see a LAST
8613                                                          * fragment only.
8614                                                          */
8615                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8616                                         }
8617                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8618                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8619                                                         data_list[0]->window_probe = 1;
8620                                                         net->window_probe = 1;
8621                                                 }
8622                                                 break;
8623                                         }
8624                                 } else {
8625                                         /*
8626                                          * Must be sent in order of the
8627                                          * TSN's (on a network)
8628                                          */
8629                                         break;
8630                                 }
8631                         }       /* for (chunk gather loop for this net) */
8632                 }               /* if asoc.state OPEN */
8633 no_data_fill:
8634                 /* Is there something to send for this destination? */
8635                 if (outchain) {
8636                         /* We may need to start a control timer or two */
8637                         if (asconf) {
8638                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8639                                     stcb, net);
8640                                 /*
8641                                  * do NOT clear the asconf flag as it is
8642                                  * used to do appropriate source address
8643                                  * selection.
8644                                  */
8645                         }
8646                         if (cookie) {
8647                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8648                                 cookie = 0;
8649                         }
8650                         /* must start a send timer if data is being sent */
8651                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8652                                 /*
8653                                  * no timer running on this destination
8654                                  * restart it.
8655                                  */
8656                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8657                         }
8658                         /* Now send it, if there is anything to send :> */
8659                         if ((error = sctp_lowlevel_chunk_output(inp,
8660                             stcb,
8661                             net,
8662                             (struct sockaddr *)&net->ro._l_addr,
8663                             outchain,
8664                             auth_offset,
8665                             auth,
8666                             auth_keyid,
8667                             no_fragmentflg,
8668                             bundle_at,
8669                             asconf,
8670                             inp->sctp_lport, stcb->rport,
8671                             htonl(stcb->asoc.peer_vtag),
8672                             net->port, NULL,
8673                             0, 0,
8674                             so_locked))) {
8675                                 /* error, we could not output */
8676                                 if (error == ENOBUFS) {
8677                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8678                                         asoc->ifp_had_enobuf = 1;
8679                                 }
8680                                 if (from_where == 0) {
8681                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8682                                 }
8683                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8684                                 if (hbflag) {
8685                                         if (*now_filled == 0) {
8686                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8687                                                 *now_filled = 1;
8688                                                 *now = net->last_sent_time;
8689                                         } else {
8690                                                 net->last_sent_time = *now;
8691                                         }
8692                                         hbflag = 0;
8693                                 }
8694                                 if (error == EHOSTUNREACH) {
8695                                         /*
8696                                          * Destination went unreachable
8697                                          * during this send
8698                                          */
8699                                         sctp_move_chunks_from_net(stcb, net);
8700                                 }
8701                                 *reason_code = 6;
8702                                 /*-
8703                                  * I add this line to be paranoid. As far as
8704                                  * I can tell the continue, takes us back to
8705                                  * the top of the for, but just to make sure
8706                                  * I will reset these again here.
8707                                  */
8708                                 ctl_cnt = bundle_at = 0;
8709                                 continue;       /* This takes us back to the
8710                                                  * for() for the nets. */
8711                         } else {
8712                                 asoc->ifp_had_enobuf = 0;
8713                         }
8714                         endoutchain = NULL;
8715                         auth = NULL;
8716                         auth_offset = 0;
8717                         if (bundle_at || hbflag) {
8718                                 /* For data/asconf and hb set time */
8719                                 if (*now_filled == 0) {
8720                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8721                                         *now_filled = 1;
8722                                         *now = net->last_sent_time;
8723                                 } else {
8724                                         net->last_sent_time = *now;
8725                                 }
8726                         }
8727                         if (!no_out_cnt) {
8728                                 *num_out += (ctl_cnt + bundle_at);
8729                         }
8730                         if (bundle_at) {
8731                                 /* setup for a RTO measurement */
8732                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8733                                 /* fill time if not already filled */
8734                                 if (*now_filled == 0) {
8735                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8736                                         *now_filled = 1;
8737                                         *now = asoc->time_last_sent;
8738                                 } else {
8739                                         asoc->time_last_sent = *now;
8740                                 }
8741                                 if (net->rto_needed) {
8742                                         data_list[0]->do_rtt = 1;
8743                                         net->rto_needed = 0;
8744                                 }
8745                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8746                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8747                         }
8748                         if (one_chunk) {
8749                                 break;
8750                         }
8751                 }
8752                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8753                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8754                 }
8755         }
8756         if (old_start_at == NULL) {
8757                 old_start_at = start_at;
8758                 start_at = TAILQ_FIRST(&asoc->nets);
8759                 if (old_start_at)
8760                         goto again_one_more_time;
8761         }
8762         /*
8763          * At the end there should be no NON timed chunks hanging on this
8764          * queue.
8765          */
8766         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8767                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8768         }
8769         if ((*num_out == 0) && (*reason_code == 0)) {
8770                 *reason_code = 4;
8771         } else {
8772                 *reason_code = 5;
8773         }
8774         sctp_clean_up_ctl(stcb, asoc, so_locked);
8775         return (0);
8776 }
8777
8778 void
8779 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8780 {
8781         /*-
8782          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8783          * the control chunk queue.
8784          */
8785         struct sctp_chunkhdr *hdr;
8786         struct sctp_tmit_chunk *chk;
8787         struct mbuf *mat;
8788
8789         SCTP_TCB_LOCK_ASSERT(stcb);
8790         sctp_alloc_a_chunk(stcb, chk);
8791         if (chk == NULL) {
8792                 /* no memory */
8793                 sctp_m_freem(op_err);
8794                 return;
8795         }
8796         chk->copy_by_ref = 0;
8797         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8798         if (op_err == NULL) {
8799                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8800                 return;
8801         }
8802         chk->send_size = 0;
8803         mat = op_err;
8804         while (mat != NULL) {
8805                 chk->send_size += SCTP_BUF_LEN(mat);
8806                 mat = SCTP_BUF_NEXT(mat);
8807         }
8808         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8809         chk->rec.chunk_id.can_take_data = 1;
8810         chk->sent = SCTP_DATAGRAM_UNSENT;
8811         chk->snd_count = 0;
8812         chk->flags = 0;
8813         chk->asoc = &stcb->asoc;
8814         chk->data = op_err;
8815         chk->whoTo = NULL;
8816         hdr = mtod(op_err, struct sctp_chunkhdr *);
8817         hdr->chunk_type = SCTP_OPERATION_ERROR;
8818         hdr->chunk_flags = 0;
8819         hdr->chunk_length = htons(chk->send_size);
8820         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8821             chk,
8822             sctp_next);
8823         chk->asoc->ctrl_queue_cnt++;
8824 }
8825
8826 int
8827 sctp_send_cookie_echo(struct mbuf *m,
8828     int offset,
8829     struct sctp_tcb *stcb,
8830     struct sctp_nets *net)
8831 {
8832         /*-
8833          * pull out the cookie and put it at the front of the control chunk
8834          * queue.
8835          */
8836         int at;
8837         struct mbuf *cookie;
8838         struct sctp_paramhdr parm, *phdr;
8839         struct sctp_chunkhdr *hdr;
8840         struct sctp_tmit_chunk *chk;
8841         uint16_t ptype, plen;
8842
8843         /* First find the cookie in the param area */
8844         cookie = NULL;
8845         at = offset + sizeof(struct sctp_init_chunk);
8846
8847         SCTP_TCB_LOCK_ASSERT(stcb);
8848         do {
8849                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8850                 if (phdr == NULL) {
8851                         return (-3);
8852                 }
8853                 ptype = ntohs(phdr->param_type);
8854                 plen = ntohs(phdr->param_length);
8855                 if (ptype == SCTP_STATE_COOKIE) {
8856                         int pad;
8857
8858                         /* found the cookie */
8859                         if ((pad = (plen % 4))) {
8860                                 plen += 4 - pad;
8861                         }
8862                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8863                         if (cookie == NULL) {
8864                                 /* No memory */
8865                                 return (-2);
8866                         }
8867 #ifdef SCTP_MBUF_LOGGING
8868                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8869                                 struct mbuf *mat;
8870
8871                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8872                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8873                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8874                                         }
8875                                 }
8876                         }
8877 #endif
8878                         break;
8879                 }
8880                 at += SCTP_SIZE32(plen);
8881         } while (phdr);
8882         if (cookie == NULL) {
8883                 /* Did not find the cookie */
8884                 return (-3);
8885         }
8886         /* ok, we got the cookie lets change it into a cookie echo chunk */
8887
8888         /* first the change from param to cookie */
8889         hdr = mtod(cookie, struct sctp_chunkhdr *);
8890         hdr->chunk_type = SCTP_COOKIE_ECHO;
8891         hdr->chunk_flags = 0;
8892         /* get the chunk stuff now and place it in the FRONT of the queue */
8893         sctp_alloc_a_chunk(stcb, chk);
8894         if (chk == NULL) {
8895                 /* no memory */
8896                 sctp_m_freem(cookie);
8897                 return (-5);
8898         }
8899         chk->copy_by_ref = 0;
8900         chk->send_size = plen;
8901         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8902         chk->rec.chunk_id.can_take_data = 0;
8903         chk->sent = SCTP_DATAGRAM_UNSENT;
8904         chk->snd_count = 0;
8905         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8906         chk->asoc = &stcb->asoc;
8907         chk->data = cookie;
8908         chk->whoTo = net;
8909         atomic_add_int(&chk->whoTo->ref_count, 1);
8910         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8911         chk->asoc->ctrl_queue_cnt++;
8912         return (0);
8913 }
8914
8915 void
8916 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8917     struct mbuf *m,
8918     int offset,
8919     int chk_length,
8920     struct sctp_nets *net)
8921 {
8922         /*
8923          * take a HB request and make it into a HB ack and send it.
8924          */
8925         struct mbuf *outchain;
8926         struct sctp_chunkhdr *chdr;
8927         struct sctp_tmit_chunk *chk;
8928
8929
8930         if (net == NULL)
8931                 /* must have a net pointer */
8932                 return;
8933
8934         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
8935         if (outchain == NULL) {
8936                 /* gak out of memory */
8937                 return;
8938         }
8939 #ifdef SCTP_MBUF_LOGGING
8940         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8941                 struct mbuf *mat;
8942
8943                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
8944                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8945                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8946                         }
8947                 }
8948         }
8949 #endif
8950         chdr = mtod(outchain, struct sctp_chunkhdr *);
8951         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
8952         chdr->chunk_flags = 0;
8953         if (chk_length % 4) {
8954                 /* need pad */
8955                 uint32_t cpthis = 0;
8956                 int padlen;
8957
8958                 padlen = 4 - (chk_length % 4);
8959                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
8960         }
8961         sctp_alloc_a_chunk(stcb, chk);
8962         if (chk == NULL) {
8963                 /* no memory */
8964                 sctp_m_freem(outchain);
8965                 return;
8966         }
8967         chk->copy_by_ref = 0;
8968         chk->send_size = chk_length;
8969         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
8970         chk->rec.chunk_id.can_take_data = 1;
8971         chk->sent = SCTP_DATAGRAM_UNSENT;
8972         chk->snd_count = 0;
8973         chk->flags = 0;
8974         chk->asoc = &stcb->asoc;
8975         chk->data = outchain;
8976         chk->whoTo = net;
8977         atomic_add_int(&chk->whoTo->ref_count, 1);
8978         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
8979         chk->asoc->ctrl_queue_cnt++;
8980 }
8981
8982 void
8983 sctp_send_cookie_ack(struct sctp_tcb *stcb)
8984 {
8985         /* formulate and queue a cookie-ack back to sender */
8986         struct mbuf *cookie_ack;
8987         struct sctp_chunkhdr *hdr;
8988         struct sctp_tmit_chunk *chk;
8989
8990         cookie_ack = NULL;
8991         SCTP_TCB_LOCK_ASSERT(stcb);
8992
8993         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
8994         if (cookie_ack == NULL) {
8995                 /* no mbuf's */
8996                 return;
8997         }
8998         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
8999         sctp_alloc_a_chunk(stcb, chk);
9000         if (chk == NULL) {
9001                 /* no memory */
9002                 sctp_m_freem(cookie_ack);
9003                 return;
9004         }
9005         chk->copy_by_ref = 0;
9006         chk->send_size = sizeof(struct sctp_chunkhdr);
9007         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9008         chk->rec.chunk_id.can_take_data = 1;
9009         chk->sent = SCTP_DATAGRAM_UNSENT;
9010         chk->snd_count = 0;
9011         chk->flags = 0;
9012         chk->asoc = &stcb->asoc;
9013         chk->data = cookie_ack;
9014         if (chk->asoc->last_control_chunk_from != NULL) {
9015                 chk->whoTo = chk->asoc->last_control_chunk_from;
9016                 atomic_add_int(&chk->whoTo->ref_count, 1);
9017         } else {
9018                 chk->whoTo = NULL;
9019         }
9020         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9021         hdr->chunk_type = SCTP_COOKIE_ACK;
9022         hdr->chunk_flags = 0;
9023         hdr->chunk_length = htons(chk->send_size);
9024         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9025         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9026         chk->asoc->ctrl_queue_cnt++;
9027         return;
9028 }
9029
9030
9031 void
9032 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9033 {
9034         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9035         struct mbuf *m_shutdown_ack;
9036         struct sctp_shutdown_ack_chunk *ack_cp;
9037         struct sctp_tmit_chunk *chk;
9038
9039         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9040         if (m_shutdown_ack == NULL) {
9041                 /* no mbuf's */
9042                 return;
9043         }
9044         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9045         sctp_alloc_a_chunk(stcb, chk);
9046         if (chk == NULL) {
9047                 /* no memory */
9048                 sctp_m_freem(m_shutdown_ack);
9049                 return;
9050         }
9051         chk->copy_by_ref = 0;
9052         chk->send_size = sizeof(struct sctp_chunkhdr);
9053         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9054         chk->rec.chunk_id.can_take_data = 1;
9055         chk->sent = SCTP_DATAGRAM_UNSENT;
9056         chk->snd_count = 0;
9057         chk->flags = 0;
9058         chk->asoc = &stcb->asoc;
9059         chk->data = m_shutdown_ack;
9060         chk->whoTo = net;
9061         if (chk->whoTo) {
9062                 atomic_add_int(&chk->whoTo->ref_count, 1);
9063         }
9064         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9065         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9066         ack_cp->ch.chunk_flags = 0;
9067         ack_cp->ch.chunk_length = htons(chk->send_size);
9068         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9069         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9070         chk->asoc->ctrl_queue_cnt++;
9071         return;
9072 }
9073
9074 void
9075 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9076 {
9077         /* formulate and queue a SHUTDOWN to the sender */
9078         struct mbuf *m_shutdown;
9079         struct sctp_shutdown_chunk *shutdown_cp;
9080         struct sctp_tmit_chunk *chk;
9081
9082         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9083         if (m_shutdown == NULL) {
9084                 /* no mbuf's */
9085                 return;
9086         }
9087         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9088         sctp_alloc_a_chunk(stcb, chk);
9089         if (chk == NULL) {
9090                 /* no memory */
9091                 sctp_m_freem(m_shutdown);
9092                 return;
9093         }
9094         chk->copy_by_ref = 0;
9095         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9096         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9097         chk->rec.chunk_id.can_take_data = 1;
9098         chk->sent = SCTP_DATAGRAM_UNSENT;
9099         chk->snd_count = 0;
9100         chk->flags = 0;
9101         chk->asoc = &stcb->asoc;
9102         chk->data = m_shutdown;
9103         chk->whoTo = net;
9104         if (chk->whoTo) {
9105                 atomic_add_int(&chk->whoTo->ref_count, 1);
9106         }
9107         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9108         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9109         shutdown_cp->ch.chunk_flags = 0;
9110         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9111         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9112         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9113         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9114         chk->asoc->ctrl_queue_cnt++;
9115         return;
9116 }
9117
9118 void
9119 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9120 {
9121         /*
9122          * formulate and queue an ASCONF to the peer. ASCONF parameters
9123          * should be queued on the assoc queue.
9124          */
9125         struct sctp_tmit_chunk *chk;
9126         struct mbuf *m_asconf;
9127         int len;
9128
9129         SCTP_TCB_LOCK_ASSERT(stcb);
9130
9131         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9132             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9133                 /* can't send a new one if there is one in flight already */
9134                 return;
9135         }
9136         /* compose an ASCONF chunk, maximum length is PMTU */
9137         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9138         if (m_asconf == NULL) {
9139                 return;
9140         }
9141         sctp_alloc_a_chunk(stcb, chk);
9142         if (chk == NULL) {
9143                 /* no memory */
9144                 sctp_m_freem(m_asconf);
9145                 return;
9146         }
9147         chk->copy_by_ref = 0;
9148         chk->data = m_asconf;
9149         chk->send_size = len;
9150         chk->rec.chunk_id.id = SCTP_ASCONF;
9151         chk->rec.chunk_id.can_take_data = 0;
9152         chk->sent = SCTP_DATAGRAM_UNSENT;
9153         chk->snd_count = 0;
9154         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9155         chk->asoc = &stcb->asoc;
9156         chk->whoTo = net;
9157         if (chk->whoTo) {
9158                 atomic_add_int(&chk->whoTo->ref_count, 1);
9159         }
9160         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9161         chk->asoc->ctrl_queue_cnt++;
9162         return;
9163 }
9164
9165 void
9166 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9167 {
9168         /*
9169          * formulate and queue a asconf-ack back to sender. the asconf-ack
9170          * must be stored in the tcb.
9171          */
9172         struct sctp_tmit_chunk *chk;
9173         struct sctp_asconf_ack *ack, *latest_ack;
9174         struct mbuf *m_ack;
9175         struct sctp_nets *net = NULL;
9176
9177         SCTP_TCB_LOCK_ASSERT(stcb);
9178         /* Get the latest ASCONF-ACK */
9179         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9180         if (latest_ack == NULL) {
9181                 return;
9182         }
9183         if (latest_ack->last_sent_to != NULL &&
9184             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9185                 /* we're doing a retransmission */
9186                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9187                 if (net == NULL) {
9188                         /* no alternate */
9189                         if (stcb->asoc.last_control_chunk_from == NULL) {
9190                                 if (stcb->asoc.alternate) {
9191                                         net = stcb->asoc.alternate;
9192                                 } else {
9193                                         net = stcb->asoc.primary_destination;
9194                                 }
9195                         } else {
9196                                 net = stcb->asoc.last_control_chunk_from;
9197                         }
9198                 }
9199         } else {
9200                 /* normal case */
9201                 if (stcb->asoc.last_control_chunk_from == NULL) {
9202                         if (stcb->asoc.alternate) {
9203                                 net = stcb->asoc.alternate;
9204                         } else {
9205                                 net = stcb->asoc.primary_destination;
9206                         }
9207                 } else {
9208                         net = stcb->asoc.last_control_chunk_from;
9209                 }
9210         }
9211         latest_ack->last_sent_to = net;
9212
9213         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9214                 if (ack->data == NULL) {
9215                         continue;
9216                 }
9217                 /* copy the asconf_ack */
9218                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9219                 if (m_ack == NULL) {
9220                         /* couldn't copy it */
9221                         return;
9222                 }
9223 #ifdef SCTP_MBUF_LOGGING
9224                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9225                         struct mbuf *mat;
9226
9227                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9228                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9229                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9230                                 }
9231                         }
9232                 }
9233 #endif
9234
9235                 sctp_alloc_a_chunk(stcb, chk);
9236                 if (chk == NULL) {
9237                         /* no memory */
9238                         if (m_ack)
9239                                 sctp_m_freem(m_ack);
9240                         return;
9241                 }
9242                 chk->copy_by_ref = 0;
9243
9244                 chk->whoTo = net;
9245                 if (chk->whoTo) {
9246                         atomic_add_int(&chk->whoTo->ref_count, 1);
9247                 }
9248                 chk->data = m_ack;
9249                 chk->send_size = 0;
9250                 /* Get size */
9251                 chk->send_size = ack->len;
9252                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9253                 chk->rec.chunk_id.can_take_data = 1;
9254                 chk->sent = SCTP_DATAGRAM_UNSENT;
9255                 chk->snd_count = 0;
9256                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9257                 chk->asoc = &stcb->asoc;
9258
9259                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9260                 chk->asoc->ctrl_queue_cnt++;
9261         }
9262         return;
9263 }
9264
9265
9266 static int
9267 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9268     struct sctp_tcb *stcb,
9269     struct sctp_association *asoc,
9270     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9271 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9272     SCTP_UNUSED
9273 #endif
9274 )
9275 {
9276         /*-
9277          * send out one MTU of retransmission. If fast_retransmit is
9278          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9279          * rwnd. For a Cookie or Asconf in the control chunk queue we
9280          * retransmit them by themselves.
9281          *
9282          * For data chunks we will pick out the lowest TSN's in the sent_queue
9283          * marked for resend and bundle them all together (up to a MTU of
9284          * destination). The address to send to should have been
9285          * selected/changed where the retransmission was marked (i.e. in FR
9286          * or t3-timeout routines).
9287          */
9288         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9289         struct sctp_tmit_chunk *chk, *fwd;
9290         struct mbuf *m, *endofchain;
9291         struct sctp_nets *net = NULL;
9292         uint32_t tsns_sent = 0;
9293         int no_fragmentflg, bundle_at, cnt_thru;
9294         unsigned int mtu;
9295         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9296         struct sctp_auth_chunk *auth = NULL;
9297         uint32_t auth_offset = 0;
9298         uint16_t auth_keyid;
9299         int override_ok = 1;
9300         int data_auth_reqd = 0;
9301         uint32_t dmtu = 0;
9302
9303         SCTP_TCB_LOCK_ASSERT(stcb);
9304         tmr_started = ctl_cnt = bundle_at = error = 0;
9305         no_fragmentflg = 1;
9306         fwd_tsn = 0;
9307         *cnt_out = 0;
9308         fwd = NULL;
9309         endofchain = m = NULL;
9310         auth_keyid = stcb->asoc.authinfo.active_keyid;
9311 #ifdef SCTP_AUDITING_ENABLED
9312         sctp_audit_log(0xC3, 1);
9313 #endif
9314         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9315             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9316                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9317                     asoc->sent_queue_retran_cnt);
9318                 asoc->sent_queue_cnt = 0;
9319                 asoc->sent_queue_cnt_removeable = 0;
9320                 /* send back 0/0 so we enter normal transmission */
9321                 *cnt_out = 0;
9322                 return (0);
9323         }
9324         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9325                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9326                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9327                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9328                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9329                                 continue;
9330                         }
9331                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9332                                 if (chk != asoc->str_reset) {
9333                                         /*
9334                                          * not eligible for retran if its
9335                                          * not ours
9336                                          */
9337                                         continue;
9338                                 }
9339                         }
9340                         ctl_cnt++;
9341                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9342                                 fwd_tsn = 1;
9343                         }
9344                         /*
9345                          * Add an AUTH chunk, if chunk requires it save the
9346                          * offset into the chain for AUTH
9347                          */
9348                         if ((auth == NULL) &&
9349                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9350                             stcb->asoc.peer_auth_chunks))) {
9351                                 m = sctp_add_auth_chunk(m, &endofchain,
9352                                     &auth, &auth_offset,
9353                                     stcb,
9354                                     chk->rec.chunk_id.id);
9355                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9356                         }
9357                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9358                         break;
9359                 }
9360         }
9361         one_chunk = 0;
9362         cnt_thru = 0;
9363         /* do we have control chunks to retransmit? */
9364         if (m != NULL) {
9365                 /* Start a timer no matter if we suceed or fail */
9366                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9367                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9368                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9369                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9370                 chk->snd_count++;       /* update our count */
9371                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9372                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9373                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9374                     no_fragmentflg, 0, 0,
9375                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9376                     chk->whoTo->port, NULL,
9377                     0, 0,
9378                     so_locked))) {
9379                         SCTP_STAT_INCR(sctps_lowlevelerr);
9380                         return (error);
9381                 }
9382                 endofchain = NULL;
9383                 auth = NULL;
9384                 auth_offset = 0;
9385                 /*
9386                  * We don't want to mark the net->sent time here since this
9387                  * we use this for HB and retrans cannot measure RTT
9388                  */
9389                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9390                 *cnt_out += 1;
9391                 chk->sent = SCTP_DATAGRAM_SENT;
9392                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9393                 if (fwd_tsn == 0) {
9394                         return (0);
9395                 } else {
9396                         /* Clean up the fwd-tsn list */
9397                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9398                         return (0);
9399                 }
9400         }
9401         /*
9402          * Ok, it is just data retransmission we need to do or that and a
9403          * fwd-tsn with it all.
9404          */
9405         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9406                 return (SCTP_RETRAN_DONE);
9407         }
9408         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9409             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9410                 /* not yet open, resend the cookie and that is it */
9411                 return (1);
9412         }
9413 #ifdef SCTP_AUDITING_ENABLED
9414         sctp_auditing(20, inp, stcb, NULL);
9415 #endif
9416         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9417         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9418                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9419                         /* No, not sent to this net or not ready for rtx */
9420                         continue;
9421                 }
9422                 if (chk->data == NULL) {
9423                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9424                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9425                         continue;
9426                 }
9427                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9428                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9429                         /* Gak, we have exceeded max unlucky retran, abort! */
9430                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9431                             chk->snd_count,
9432                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9433                         atomic_add_int(&stcb->asoc.refcnt, 1);
9434                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9435                         SCTP_TCB_LOCK(stcb);
9436                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9437                         return (SCTP_RETRAN_EXIT);
9438                 }
9439                 /* pick up the net */
9440                 net = chk->whoTo;
9441                 switch (net->ro._l_addr.sa.sa_family) {
9442 #ifdef INET
9443                 case AF_INET:
9444                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9445                         break;
9446 #endif
9447 #ifdef INET6
9448                 case AF_INET6:
9449                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9450                         break;
9451 #endif
9452                 default:
9453                         /* TSNH */
9454                         mtu = net->mtu;
9455                         break;
9456                 }
9457
9458                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9459                         /* No room in peers rwnd */
9460                         uint32_t tsn;
9461
9462                         tsn = asoc->last_acked_seq + 1;
9463                         if (tsn == chk->rec.data.TSN_seq) {
9464                                 /*
9465                                  * we make a special exception for this
9466                                  * case. The peer has no rwnd but is missing
9467                                  * the lowest chunk.. which is probably what
9468                                  * is holding up the rwnd.
9469                                  */
9470                                 goto one_chunk_around;
9471                         }
9472                         return (1);
9473                 }
9474 one_chunk_around:
9475                 if (asoc->peers_rwnd < mtu) {
9476                         one_chunk = 1;
9477                         if ((asoc->peers_rwnd == 0) &&
9478                             (asoc->total_flight == 0)) {
9479                                 chk->window_probe = 1;
9480                                 chk->whoTo->window_probe = 1;
9481                         }
9482                 }
9483 #ifdef SCTP_AUDITING_ENABLED
9484                 sctp_audit_log(0xC3, 2);
9485 #endif
9486                 bundle_at = 0;
9487                 m = NULL;
9488                 net->fast_retran_ip = 0;
9489                 if (chk->rec.data.doing_fast_retransmit == 0) {
9490                         /*
9491                          * if no FR in progress skip destination that have
9492                          * flight_size > cwnd.
9493                          */
9494                         if (net->flight_size >= net->cwnd) {
9495                                 continue;
9496                         }
9497                 } else {
9498                         /*
9499                          * Mark the destination net to have FR recovery
9500                          * limits put on it.
9501                          */
9502                         *fr_done = 1;
9503                         net->fast_retran_ip = 1;
9504                 }
9505
9506                 /*
9507                  * if no AUTH is yet included and this chunk requires it,
9508                  * make sure to account for it.  We don't apply the size
9509                  * until the AUTH chunk is actually added below in case
9510                  * there is no room for this chunk.
9511                  */
9512                 if (data_auth_reqd && (auth == NULL)) {
9513                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9514                 } else
9515                         dmtu = 0;
9516
9517                 if ((chk->send_size <= (mtu - dmtu)) ||
9518                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9519                         /* ok we will add this one */
9520                         if (data_auth_reqd) {
9521                                 if (auth == NULL) {
9522                                         m = sctp_add_auth_chunk(m,
9523                                             &endofchain,
9524                                             &auth,
9525                                             &auth_offset,
9526                                             stcb,
9527                                             SCTP_DATA);
9528                                         auth_keyid = chk->auth_keyid;
9529                                         override_ok = 0;
9530                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9531                                 } else if (override_ok) {
9532                                         auth_keyid = chk->auth_keyid;
9533                                         override_ok = 0;
9534                                 } else if (chk->auth_keyid != auth_keyid) {
9535                                         /* different keyid, so done bundling */
9536                                         break;
9537                                 }
9538                         }
9539                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9540                         if (m == NULL) {
9541                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9542                                 return (ENOMEM);
9543                         }
9544                         /* Do clear IP_DF ? */
9545                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9546                                 no_fragmentflg = 0;
9547                         }
9548                         /* upate our MTU size */
9549                         if (mtu > (chk->send_size + dmtu))
9550                                 mtu -= (chk->send_size + dmtu);
9551                         else
9552                                 mtu = 0;
9553                         data_list[bundle_at++] = chk;
9554                         if (one_chunk && (asoc->total_flight <= 0)) {
9555                                 SCTP_STAT_INCR(sctps_windowprobed);
9556                         }
9557                 }
9558                 if (one_chunk == 0) {
9559                         /*
9560                          * now are there anymore forward from chk to pick
9561                          * up?
9562                          */
9563                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9564                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9565                                         /* Nope, not for retran */
9566                                         continue;
9567                                 }
9568                                 if (fwd->whoTo != net) {
9569                                         /* Nope, not the net in question */
9570                                         continue;
9571                                 }
9572                                 if (data_auth_reqd && (auth == NULL)) {
9573                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9574                                 } else
9575                                         dmtu = 0;
9576                                 if (fwd->send_size <= (mtu - dmtu)) {
9577                                         if (data_auth_reqd) {
9578                                                 if (auth == NULL) {
9579                                                         m = sctp_add_auth_chunk(m,
9580                                                             &endofchain,
9581                                                             &auth,
9582                                                             &auth_offset,
9583                                                             stcb,
9584                                                             SCTP_DATA);
9585                                                         auth_keyid = fwd->auth_keyid;
9586                                                         override_ok = 0;
9587                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9588                                                 } else if (override_ok) {
9589                                                         auth_keyid = fwd->auth_keyid;
9590                                                         override_ok = 0;
9591                                                 } else if (fwd->auth_keyid != auth_keyid) {
9592                                                         /*
9593                                                          * different keyid,
9594                                                          * so done bundling
9595                                                          */
9596                                                         break;
9597                                                 }
9598                                         }
9599                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9600                                         if (m == NULL) {
9601                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9602                                                 return (ENOMEM);
9603                                         }
9604                                         /* Do clear IP_DF ? */
9605                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9606                                                 no_fragmentflg = 0;
9607                                         }
9608                                         /* upate our MTU size */
9609                                         if (mtu > (fwd->send_size + dmtu))
9610                                                 mtu -= (fwd->send_size + dmtu);
9611                                         else
9612                                                 mtu = 0;
9613                                         data_list[bundle_at++] = fwd;
9614                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9615                                                 break;
9616                                         }
9617                                 } else {
9618                                         /* can't fit so we are done */
9619                                         break;
9620                                 }
9621                         }
9622                 }
9623                 /* Is there something to send for this destination? */
9624                 if (m) {
9625                         /*
9626                          * No matter if we fail/or suceed we should start a
9627                          * timer. A failure is like a lost IP packet :-)
9628                          */
9629                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9630                                 /*
9631                                  * no timer running on this destination
9632                                  * restart it.
9633                                  */
9634                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9635                                 tmr_started = 1;
9636                         }
9637                         /* Now lets send it, if there is anything to send :> */
9638                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9639                             (struct sockaddr *)&net->ro._l_addr, m,
9640                             auth_offset, auth, auth_keyid,
9641                             no_fragmentflg, 0, 0,
9642                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9643                             net->port, NULL,
9644                             0, 0,
9645                             so_locked))) {
9646                                 /* error, we could not output */
9647                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9648                                 return (error);
9649                         }
9650                         endofchain = NULL;
9651                         auth = NULL;
9652                         auth_offset = 0;
9653                         /* For HB's */
9654                         /*
9655                          * We don't want to mark the net->sent time here
9656                          * since this we use this for HB and retrans cannot
9657                          * measure RTT
9658                          */
9659                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9660
9661                         /* For auto-close */
9662                         cnt_thru++;
9663                         if (*now_filled == 0) {
9664                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9665                                 *now = asoc->time_last_sent;
9666                                 *now_filled = 1;
9667                         } else {
9668                                 asoc->time_last_sent = *now;
9669                         }
9670                         *cnt_out += bundle_at;
9671 #ifdef SCTP_AUDITING_ENABLED
9672                         sctp_audit_log(0xC4, bundle_at);
9673 #endif
9674                         if (bundle_at) {
9675                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9676                         }
9677                         for (i = 0; i < bundle_at; i++) {
9678                                 SCTP_STAT_INCR(sctps_sendretransdata);
9679                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9680                                 /*
9681                                  * When we have a revoked data, and we
9682                                  * retransmit it, then we clear the revoked
9683                                  * flag since this flag dictates if we
9684                                  * subtracted from the fs
9685                                  */
9686                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9687                                         /* Deflate the cwnd */
9688                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9689                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9690                                 }
9691                                 data_list[i]->snd_count++;
9692                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9693                                 /* record the time */
9694                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9695                                 if (data_list[i]->book_size_scale) {
9696                                         /*
9697                                          * need to double the book size on
9698                                          * this one
9699                                          */
9700                                         data_list[i]->book_size_scale = 0;
9701                                         /*
9702                                          * Since we double the booksize, we
9703                                          * must also double the output queue
9704                                          * size, since this get shrunk when
9705                                          * we free by this amount.
9706                                          */
9707                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9708                                         data_list[i]->book_size *= 2;
9709
9710
9711                                 } else {
9712                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9713                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9714                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9715                                         }
9716                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9717                                             (uint32_t) (data_list[i]->send_size +
9718                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9719                                 }
9720                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9721                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9722                                             data_list[i]->whoTo->flight_size,
9723                                             data_list[i]->book_size,
9724                                             (uintptr_t) data_list[i]->whoTo,
9725                                             data_list[i]->rec.data.TSN_seq);
9726                                 }
9727                                 sctp_flight_size_increase(data_list[i]);
9728                                 sctp_total_flight_increase(stcb, data_list[i]);
9729                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9730                                         /* SWS sender side engages */
9731                                         asoc->peers_rwnd = 0;
9732                                 }
9733                                 if ((i == 0) &&
9734                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9735                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9736                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9737                                             (tmr_started == 0)) {
9738                                                 /*-
9739                                                  * ok we just fast-retrans'd
9740                                                  * the lowest TSN, i.e the
9741                                                  * first on the list. In
9742                                                  * this case we want to give
9743                                                  * some more time to get a
9744                                                  * SACK back without a
9745                                                  * t3-expiring.
9746                                                  */
9747                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9748                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9749                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9750                                         }
9751                                 }
9752                         }
9753                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9754                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9755                         }
9756 #ifdef SCTP_AUDITING_ENABLED
9757                         sctp_auditing(21, inp, stcb, NULL);
9758 #endif
9759                 } else {
9760                         /* None will fit */
9761                         return (1);
9762                 }
9763                 if (asoc->sent_queue_retran_cnt <= 0) {
9764                         /* all done we have no more to retran */
9765                         asoc->sent_queue_retran_cnt = 0;
9766                         break;
9767                 }
9768                 if (one_chunk) {
9769                         /* No more room in rwnd */
9770                         return (1);
9771                 }
9772                 /* stop the for loop here. we sent out a packet */
9773                 break;
9774         }
9775         return (0);
9776 }
9777
9778 static void
9779 sctp_timer_validation(struct sctp_inpcb *inp,
9780     struct sctp_tcb *stcb,
9781     struct sctp_association *asoc)
9782 {
9783         struct sctp_nets *net;
9784
9785         /* Validate that a timer is running somewhere */
9786         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9787                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9788                         /* Here is a timer */
9789                         return;
9790                 }
9791         }
9792         SCTP_TCB_LOCK_ASSERT(stcb);
9793         /* Gak, we did not have a timer somewhere */
9794         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9795         if (asoc->alternate) {
9796                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9797         } else {
9798                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9799         }
9800         return;
9801 }
9802
9803 void
9804 sctp_chunk_output(struct sctp_inpcb *inp,
9805     struct sctp_tcb *stcb,
9806     int from_where,
9807     int so_locked
9808 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9809     SCTP_UNUSED
9810 #endif
9811 )
9812 {
9813         /*-
9814          * Ok this is the generic chunk service queue. we must do the
9815          * following:
9816          * - See if there are retransmits pending, if so we must
9817          *   do these first.
9818          * - Service the stream queue that is next, moving any
9819          *   message (note I must get a complete message i.e.
9820          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9821          *   TSN's
9822          * - Check to see if the cwnd/rwnd allows any output, if so we
9823          *   go ahead and fomulate and send the low level chunks. Making sure
9824          *   to combine any control in the control chunk queue also.
9825          */
9826         struct sctp_association *asoc;
9827         struct sctp_nets *net;
9828         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9829         unsigned int burst_cnt = 0;
9830         struct timeval now;
9831         int now_filled = 0;
9832         int nagle_on;
9833         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9834         int un_sent = 0;
9835         int fr_done;
9836         unsigned int tot_frs = 0;
9837
9838         asoc = &stcb->asoc;
9839         /* The Nagle algorithm is only applied when handling a send call. */
9840         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9841                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9842                         nagle_on = 0;
9843                 } else {
9844                         nagle_on = 1;
9845                 }
9846         } else {
9847                 nagle_on = 0;
9848         }
9849         SCTP_TCB_LOCK_ASSERT(stcb);
9850
9851         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9852
9853         if ((un_sent <= 0) &&
9854             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9855             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9856             (asoc->sent_queue_retran_cnt == 0)) {
9857                 /* Nothing to do unless there is something to be sent left */
9858                 return;
9859         }
9860         /*
9861          * Do we have something to send, data or control AND a sack timer
9862          * running, if so piggy-back the sack.
9863          */
9864         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9865                 sctp_send_sack(stcb, so_locked);
9866                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9867         }
9868         while (asoc->sent_queue_retran_cnt) {
9869                 /*-
9870                  * Ok, it is retransmission time only, we send out only ONE
9871                  * packet with a single call off to the retran code.
9872                  */
9873                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9874                         /*-
9875                          * Special hook for handling cookiess discarded
9876                          * by peer that carried data. Send cookie-ack only
9877                          * and then the next call with get the retran's.
9878                          */
9879                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9880                             from_where,
9881                             &now, &now_filled, frag_point, so_locked);
9882                         return;
9883                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9884                         /* if its not from a HB then do it */
9885                         fr_done = 0;
9886                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9887                         if (fr_done) {
9888                                 tot_frs++;
9889                         }
9890                 } else {
9891                         /*
9892                          * its from any other place, we don't allow retran
9893                          * output (only control)
9894                          */
9895                         ret = 1;
9896                 }
9897                 if (ret > 0) {
9898                         /* Can't send anymore */
9899                         /*-
9900                          * now lets push out control by calling med-level
9901                          * output once. this assures that we WILL send HB's
9902                          * if queued too.
9903                          */
9904                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9905                             from_where,
9906                             &now, &now_filled, frag_point, so_locked);
9907 #ifdef SCTP_AUDITING_ENABLED
9908                         sctp_auditing(8, inp, stcb, NULL);
9909 #endif
9910                         sctp_timer_validation(inp, stcb, asoc);
9911                         return;
9912                 }
9913                 if (ret < 0) {
9914                         /*-
9915                          * The count was off.. retran is not happening so do
9916                          * the normal retransmission.
9917                          */
9918 #ifdef SCTP_AUDITING_ENABLED
9919                         sctp_auditing(9, inp, stcb, NULL);
9920 #endif
9921                         if (ret == SCTP_RETRAN_EXIT) {
9922                                 return;
9923                         }
9924                         break;
9925                 }
9926                 if (from_where == SCTP_OUTPUT_FROM_T3) {
9927                         /* Only one transmission allowed out of a timeout */
9928 #ifdef SCTP_AUDITING_ENABLED
9929                         sctp_auditing(10, inp, stcb, NULL);
9930 #endif
9931                         /* Push out any control */
9932                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
9933                             &now, &now_filled, frag_point, so_locked);
9934                         return;
9935                 }
9936                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
9937                         /* Hit FR burst limit */
9938                         return;
9939                 }
9940                 if ((num_out == 0) && (ret == 0)) {
9941                         /* No more retrans to send */
9942                         break;
9943                 }
9944         }
9945 #ifdef SCTP_AUDITING_ENABLED
9946         sctp_auditing(12, inp, stcb, NULL);
9947 #endif
9948         /* Check for bad destinations, if they exist move chunks around. */
9949         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9950                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
9951                         /*-
9952                          * if possible move things off of this address we
9953                          * still may send below due to the dormant state but
9954                          * we try to find an alternate address to send to
9955                          * and if we have one we move all queued data on the
9956                          * out wheel to this alternate address.
9957                          */
9958                         if (net->ref_count > 1)
9959                                 sctp_move_chunks_from_net(stcb, net);
9960                 } else {
9961                         /*-
9962                          * if ((asoc->sat_network) || (net->addr_is_local))
9963                          * { burst_limit = asoc->max_burst *
9964                          * SCTP_SAT_NETWORK_BURST_INCR; }
9965                          */
9966                         if (asoc->max_burst > 0) {
9967                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
9968                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
9969                                                 /*
9970                                                  * JRS - Use the congestion
9971                                                  * control given in the
9972                                                  * congestion control module
9973                                                  */
9974                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
9975                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
9976                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
9977                                                 }
9978                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
9979                                         }
9980                                         net->fast_retran_ip = 0;
9981                                 } else {
9982                                         if (net->flight_size == 0) {
9983                                                 /*
9984                                                  * Should be decaying the
9985                                                  * cwnd here
9986                                                  */
9987                                                 ;
9988                                         }
9989                                 }
9990                         }
9991                 }
9992
9993         }
9994         burst_cnt = 0;
9995         do {
9996                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
9997                     &reason_code, 0, from_where,
9998                     &now, &now_filled, frag_point, so_locked);
9999                 if (error) {
10000                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10001                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10002                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10003                         }
10004                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10005                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10006                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10007                         }
10008                         break;
10009                 }
10010                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10011
10012                 tot_out += num_out;
10013                 burst_cnt++;
10014                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10015                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10016                         if (num_out == 0) {
10017                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10018                         }
10019                 }
10020                 if (nagle_on) {
10021                         /*
10022                          * When the Nagle algorithm is used, look at how
10023                          * much is unsent, then if its smaller than an MTU
10024                          * and we have data in flight we stop, except if we
10025                          * are handling a fragmented user message.
10026                          */
10027                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10028                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10029                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10030                             (stcb->asoc.total_flight > 0) &&
10031                             ((stcb->asoc.locked_on_sending == NULL) ||
10032                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10033                                 break;
10034                         }
10035                 }
10036                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10037                     TAILQ_EMPTY(&asoc->send_queue) &&
10038                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10039                         /* Nothing left to send */
10040                         break;
10041                 }
10042                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10043                         /* Nothing left to send */
10044                         break;
10045                 }
10046         } while (num_out &&
10047             ((asoc->max_burst == 0) ||
10048             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10049             (burst_cnt < asoc->max_burst)));
10050
10051         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10052                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10053                         SCTP_STAT_INCR(sctps_maxburstqueued);
10054                         asoc->burst_limit_applied = 1;
10055                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10056                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10057                         }
10058                 } else {
10059                         asoc->burst_limit_applied = 0;
10060                 }
10061         }
10062         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10063                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10064         }
10065         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10066             tot_out);
10067
10068         /*-
10069          * Now we need to clean up the control chunk chain if a ECNE is on
10070          * it. It must be marked as UNSENT again so next call will continue
10071          * to send it until such time that we get a CWR, to remove it.
10072          */
10073         if (stcb->asoc.ecn_echo_cnt_onq)
10074                 sctp_fix_ecn_echo(asoc);
10075         return;
10076 }
10077
10078
10079 int
10080 sctp_output(
10081     struct sctp_inpcb *inp,
10082     struct mbuf *m,
10083     struct sockaddr *addr,
10084     struct mbuf *control,
10085     struct thread *p,
10086     int flags)
10087 {
10088         if (inp == NULL) {
10089                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10090                 return (EINVAL);
10091         }
10092         if (inp->sctp_socket == NULL) {
10093                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10094                 return (EINVAL);
10095         }
10096         return (sctp_sosend(inp->sctp_socket,
10097             addr,
10098             (struct uio *)NULL,
10099             m,
10100             control,
10101             flags, p
10102             ));
10103 }
10104
10105 void
10106 send_forward_tsn(struct sctp_tcb *stcb,
10107     struct sctp_association *asoc)
10108 {
10109         struct sctp_tmit_chunk *chk;
10110         struct sctp_forward_tsn_chunk *fwdtsn;
10111         uint32_t advance_peer_ack_point;
10112
10113         SCTP_TCB_LOCK_ASSERT(stcb);
10114         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10115                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10116                         /* mark it to unsent */
10117                         chk->sent = SCTP_DATAGRAM_UNSENT;
10118                         chk->snd_count = 0;
10119                         /* Do we correct its output location? */
10120                         if (chk->whoTo) {
10121                                 sctp_free_remote_addr(chk->whoTo);
10122                                 chk->whoTo = NULL;
10123                         }
10124                         goto sctp_fill_in_rest;
10125                 }
10126         }
10127         /* Ok if we reach here we must build one */
10128         sctp_alloc_a_chunk(stcb, chk);
10129         if (chk == NULL) {
10130                 return;
10131         }
10132         asoc->fwd_tsn_cnt++;
10133         chk->copy_by_ref = 0;
10134         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10135         chk->rec.chunk_id.can_take_data = 0;
10136         chk->asoc = asoc;
10137         chk->whoTo = NULL;
10138         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10139         if (chk->data == NULL) {
10140                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10141                 return;
10142         }
10143         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10144         chk->sent = SCTP_DATAGRAM_UNSENT;
10145         chk->snd_count = 0;
10146         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10147         asoc->ctrl_queue_cnt++;
10148 sctp_fill_in_rest:
10149         /*-
10150          * Here we go through and fill out the part that deals with
10151          * stream/seq of the ones we skip.
10152          */
10153         SCTP_BUF_LEN(chk->data) = 0;
10154         {
10155                 struct sctp_tmit_chunk *at, *tp1, *last;
10156                 struct sctp_strseq *strseq;
10157                 unsigned int cnt_of_space, i, ovh;
10158                 unsigned int space_needed;
10159                 unsigned int cnt_of_skipped = 0;
10160
10161                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10162                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10163                                 /* no more to look at */
10164                                 break;
10165                         }
10166                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10167                                 /* We don't report these */
10168                                 continue;
10169                         }
10170                         cnt_of_skipped++;
10171                 }
10172                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10173                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10174
10175                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10176
10177                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10178                         ovh = SCTP_MIN_OVERHEAD;
10179                 } else {
10180                         ovh = SCTP_MIN_V4_OVERHEAD;
10181                 }
10182                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10183                         /* trim to a mtu size */
10184                         cnt_of_space = asoc->smallest_mtu - ovh;
10185                 }
10186                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10187                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10188                             0xff, 0, cnt_of_skipped,
10189                             asoc->advanced_peer_ack_point);
10190
10191                 }
10192                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10193                 if (cnt_of_space < space_needed) {
10194                         /*-
10195                          * ok we must trim down the chunk by lowering the
10196                          * advance peer ack point.
10197                          */
10198                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10199                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10200                                     0xff, 0xff, cnt_of_space,
10201                                     space_needed);
10202                         }
10203                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10204                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10205                         /*-
10206                          * Go through and find the TSN that will be the one
10207                          * we report.
10208                          */
10209                         at = TAILQ_FIRST(&asoc->sent_queue);
10210                         if (at != NULL) {
10211                                 for (i = 0; i < cnt_of_skipped; i++) {
10212                                         tp1 = TAILQ_NEXT(at, sctp_next);
10213                                         if (tp1 == NULL) {
10214                                                 break;
10215                                         }
10216                                         at = tp1;
10217                                 }
10218                         }
10219                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10220                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10221                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10222                                     asoc->advanced_peer_ack_point);
10223                         }
10224                         last = at;
10225                         /*-
10226                          * last now points to last one I can report, update
10227                          * peer ack point
10228                          */
10229                         if (last)
10230                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10231                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10232                             cnt_of_skipped * sizeof(struct sctp_strseq);
10233                 }
10234                 chk->send_size = space_needed;
10235                 /* Setup the chunk */
10236                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10237                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10238                 fwdtsn->ch.chunk_flags = 0;
10239                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10240                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10241                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10242                 fwdtsn++;
10243                 /*-
10244                  * Move pointer to after the fwdtsn and transfer to the
10245                  * strseq pointer.
10246                  */
10247                 strseq = (struct sctp_strseq *)fwdtsn;
10248                 /*-
10249                  * Now populate the strseq list. This is done blindly
10250                  * without pulling out duplicate stream info. This is
10251                  * inefficent but won't harm the process since the peer will
10252                  * look at these in sequence and will thus release anything.
10253                  * It could mean we exceed the PMTU and chop off some that
10254                  * we could have included.. but this is unlikely (aka 1432/4
10255                  * would mean 300+ stream seq's would have to be reported in
10256                  * one FWD-TSN. With a bit of work we can later FIX this to
10257                  * optimize and pull out duplcates.. but it does add more
10258                  * overhead. So for now... not!
10259                  */
10260                 at = TAILQ_FIRST(&asoc->sent_queue);
10261                 for (i = 0; i < cnt_of_skipped; i++) {
10262                         tp1 = TAILQ_NEXT(at, sctp_next);
10263                         if (tp1 == NULL)
10264                                 break;
10265                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10266                                 /* We don't report these */
10267                                 i--;
10268                                 at = tp1;
10269                                 continue;
10270                         }
10271                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10272                                 at->rec.data.fwd_tsn_cnt = 0;
10273                         }
10274                         strseq->stream = ntohs(at->rec.data.stream_number);
10275                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10276                         strseq++;
10277                         at = tp1;
10278                 }
10279         }
10280         return;
10281 }
10282
10283 void
10284 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10285 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10286     SCTP_UNUSED
10287 #endif
10288 )
10289 {
10290         /*-
10291          * Queue up a SACK or NR-SACK in the control queue.
10292          * We must first check to see if a SACK or NR-SACK is
10293          * somehow on the control queue.
10294          * If so, we will take and and remove the old one.
10295          */
10296         struct sctp_association *asoc;
10297         struct sctp_tmit_chunk *chk, *a_chk;
10298         struct sctp_sack_chunk *sack;
10299         struct sctp_nr_sack_chunk *nr_sack;
10300         struct sctp_gap_ack_block *gap_descriptor;
10301         struct sack_track *selector;
10302         int mergeable = 0;
10303         int offset;
10304         caddr_t limit;
10305         uint32_t *dup;
10306         int limit_reached = 0;
10307         unsigned int i, siz, j;
10308         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10309         int num_dups = 0;
10310         int space_req;
10311         uint32_t highest_tsn;
10312         uint8_t flags;
10313         uint8_t type;
10314         uint8_t tsn_map;
10315
10316         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10317             (stcb->asoc.peer_supports_nr_sack == 1)) {
10318                 type = SCTP_NR_SELECTIVE_ACK;
10319         } else {
10320                 type = SCTP_SELECTIVE_ACK;
10321         }
10322         a_chk = NULL;
10323         asoc = &stcb->asoc;
10324         SCTP_TCB_LOCK_ASSERT(stcb);
10325         if (asoc->last_data_chunk_from == NULL) {
10326                 /* Hmm we never received anything */
10327                 return;
10328         }
10329         sctp_slide_mapping_arrays(stcb);
10330         sctp_set_rwnd(stcb, asoc);
10331         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10332                 if (chk->rec.chunk_id.id == type) {
10333                         /* Hmm, found a sack already on queue, remove it */
10334                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10335                         asoc->ctrl_queue_cnt--;
10336                         a_chk = chk;
10337                         if (a_chk->data) {
10338                                 sctp_m_freem(a_chk->data);
10339                                 a_chk->data = NULL;
10340                         }
10341                         if (a_chk->whoTo) {
10342                                 sctp_free_remote_addr(a_chk->whoTo);
10343                                 a_chk->whoTo = NULL;
10344                         }
10345                         break;
10346                 }
10347         }
10348         if (a_chk == NULL) {
10349                 sctp_alloc_a_chunk(stcb, a_chk);
10350                 if (a_chk == NULL) {
10351                         /* No memory so we drop the idea, and set a timer */
10352                         if (stcb->asoc.delayed_ack) {
10353                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10354                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10355                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10356                                     stcb->sctp_ep, stcb, NULL);
10357                         } else {
10358                                 stcb->asoc.send_sack = 1;
10359                         }
10360                         return;
10361                 }
10362                 a_chk->copy_by_ref = 0;
10363                 a_chk->rec.chunk_id.id = type;
10364                 a_chk->rec.chunk_id.can_take_data = 1;
10365         }
10366         /* Clear our pkt counts */
10367         asoc->data_pkts_seen = 0;
10368
10369         a_chk->asoc = asoc;
10370         a_chk->snd_count = 0;
10371         a_chk->send_size = 0;   /* fill in later */
10372         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10373         a_chk->whoTo = NULL;
10374
10375         if ((asoc->numduptsns) ||
10376             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10377                 /*-
10378                  * Ok, we have some duplicates or the destination for the
10379                  * sack is unreachable, lets see if we can select an
10380                  * alternate than asoc->last_data_chunk_from
10381                  */
10382                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10383                     (asoc->used_alt_onsack > asoc->numnets)) {
10384                         /* We used an alt last time, don't this time */
10385                         a_chk->whoTo = NULL;
10386                 } else {
10387                         asoc->used_alt_onsack++;
10388                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10389                 }
10390                 if (a_chk->whoTo == NULL) {
10391                         /* Nope, no alternate */
10392                         a_chk->whoTo = asoc->last_data_chunk_from;
10393                         asoc->used_alt_onsack = 0;
10394                 }
10395         } else {
10396                 /*
10397                  * No duplicates so we use the last place we received data
10398                  * from.
10399                  */
10400                 asoc->used_alt_onsack = 0;
10401                 a_chk->whoTo = asoc->last_data_chunk_from;
10402         }
10403         if (a_chk->whoTo) {
10404                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10405         }
10406         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10407                 highest_tsn = asoc->highest_tsn_inside_map;
10408         } else {
10409                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10410         }
10411         if (highest_tsn == asoc->cumulative_tsn) {
10412                 /* no gaps */
10413                 if (type == SCTP_SELECTIVE_ACK) {
10414                         space_req = sizeof(struct sctp_sack_chunk);
10415                 } else {
10416                         space_req = sizeof(struct sctp_nr_sack_chunk);
10417                 }
10418         } else {
10419                 /* gaps get a cluster */
10420                 space_req = MCLBYTES;
10421         }
10422         /* Ok now lets formulate a MBUF with our sack */
10423         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10424         if ((a_chk->data == NULL) ||
10425             (a_chk->whoTo == NULL)) {
10426                 /* rats, no mbuf memory */
10427                 if (a_chk->data) {
10428                         /* was a problem with the destination */
10429                         sctp_m_freem(a_chk->data);
10430                         a_chk->data = NULL;
10431                 }
10432                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10433                 /* sa_ignore NO_NULL_CHK */
10434                 if (stcb->asoc.delayed_ack) {
10435                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10436                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10437                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10438                             stcb->sctp_ep, stcb, NULL);
10439                 } else {
10440                         stcb->asoc.send_sack = 1;
10441                 }
10442                 return;
10443         }
10444         /* ok, lets go through and fill it in */
10445         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10446         space = M_TRAILINGSPACE(a_chk->data);
10447         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10448                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10449         }
10450         limit = mtod(a_chk->data, caddr_t);
10451         limit += space;
10452
10453         flags = 0;
10454
10455         if ((asoc->sctp_cmt_on_off > 0) &&
10456             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10457                 /*-
10458                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10459                  * received, then set high bit to 1, else 0. Reset
10460                  * pkts_rcvd.
10461                  */
10462                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10463                 asoc->cmt_dac_pkts_rcvd = 0;
10464         }
10465 #ifdef SCTP_ASOCLOG_OF_TSNS
10466         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10467         stcb->asoc.cumack_log_atsnt++;
10468         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10469                 stcb->asoc.cumack_log_atsnt = 0;
10470         }
10471 #endif
10472         /* reset the readers interpretation */
10473         stcb->freed_by_sorcv_sincelast = 0;
10474
10475         if (type == SCTP_SELECTIVE_ACK) {
10476                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10477                 nr_sack = NULL;
10478                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10479                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10480                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10481                 } else {
10482                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10483                 }
10484         } else {
10485                 sack = NULL;
10486                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10487                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10488                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10489                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10490                 } else {
10491                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10492                 }
10493         }
10494
10495         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10496                 offset = 1;
10497         } else {
10498                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10499         }
10500         if (((type == SCTP_SELECTIVE_ACK) &&
10501             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10502             ((type == SCTP_NR_SELECTIVE_ACK) &&
10503             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10504                 /* we have a gap .. maybe */
10505                 for (i = 0; i < siz; i++) {
10506                         tsn_map = asoc->mapping_array[i];
10507                         if (type == SCTP_SELECTIVE_ACK) {
10508                                 tsn_map |= asoc->nr_mapping_array[i];
10509                         }
10510                         if (i == 0) {
10511                                 /*
10512                                  * Clear all bits corresponding to TSNs
10513                                  * smaller or equal to the cumulative TSN.
10514                                  */
10515                                 tsn_map &= (~0 << (1 - offset));
10516                         }
10517                         selector = &sack_array[tsn_map];
10518                         if (mergeable && selector->right_edge) {
10519                                 /*
10520                                  * Backup, left and right edges were ok to
10521                                  * merge.
10522                                  */
10523                                 num_gap_blocks--;
10524                                 gap_descriptor--;
10525                         }
10526                         if (selector->num_entries == 0)
10527                                 mergeable = 0;
10528                         else {
10529                                 for (j = 0; j < selector->num_entries; j++) {
10530                                         if (mergeable && selector->right_edge) {
10531                                                 /*
10532                                                  * do a merge by NOT setting
10533                                                  * the left side
10534                                                  */
10535                                                 mergeable = 0;
10536                                         } else {
10537                                                 /*
10538                                                  * no merge, set the left
10539                                                  * side
10540                                                  */
10541                                                 mergeable = 0;
10542                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10543                                         }
10544                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10545                                         num_gap_blocks++;
10546                                         gap_descriptor++;
10547                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10548                                                 /* no more room */
10549                                                 limit_reached = 1;
10550                                                 break;
10551                                         }
10552                                 }
10553                                 if (selector->left_edge) {
10554                                         mergeable = 1;
10555                                 }
10556                         }
10557                         if (limit_reached) {
10558                                 /* Reached the limit stop */
10559                                 break;
10560                         }
10561                         offset += 8;
10562                 }
10563         }
10564         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10565             (limit_reached == 0)) {
10566
10567                 mergeable = 0;
10568
10569                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10570                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10571                 } else {
10572                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10573                 }
10574
10575                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10576                         offset = 1;
10577                 } else {
10578                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10579                 }
10580                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10581                         /* we have a gap .. maybe */
10582                         for (i = 0; i < siz; i++) {
10583                                 tsn_map = asoc->nr_mapping_array[i];
10584                                 if (i == 0) {
10585                                         /*
10586                                          * Clear all bits corresponding to
10587                                          * TSNs smaller or equal to the
10588                                          * cumulative TSN.
10589                                          */
10590                                         tsn_map &= (~0 << (1 - offset));
10591                                 }
10592                                 selector = &sack_array[tsn_map];
10593                                 if (mergeable && selector->right_edge) {
10594                                         /*
10595                                          * Backup, left and right edges were
10596                                          * ok to merge.
10597                                          */
10598                                         num_nr_gap_blocks--;
10599                                         gap_descriptor--;
10600                                 }
10601                                 if (selector->num_entries == 0)
10602                                         mergeable = 0;
10603                                 else {
10604                                         for (j = 0; j < selector->num_entries; j++) {
10605                                                 if (mergeable && selector->right_edge) {
10606                                                         /*
10607                                                          * do a merge by NOT
10608                                                          * setting the left
10609                                                          * side
10610                                                          */
10611                                                         mergeable = 0;
10612                                                 } else {
10613                                                         /*
10614                                                          * no merge, set the
10615                                                          * left side
10616                                                          */
10617                                                         mergeable = 0;
10618                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10619                                                 }
10620                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10621                                                 num_nr_gap_blocks++;
10622                                                 gap_descriptor++;
10623                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10624                                                         /* no more room */
10625                                                         limit_reached = 1;
10626                                                         break;
10627                                                 }
10628                                         }
10629                                         if (selector->left_edge) {
10630                                                 mergeable = 1;
10631                                         }
10632                                 }
10633                                 if (limit_reached) {
10634                                         /* Reached the limit stop */
10635                                         break;
10636                                 }
10637                                 offset += 8;
10638                         }
10639                 }
10640         }
10641         /* now we must add any dups we are going to report. */
10642         if ((limit_reached == 0) && (asoc->numduptsns)) {
10643                 dup = (uint32_t *) gap_descriptor;
10644                 for (i = 0; i < asoc->numduptsns; i++) {
10645                         *dup = htonl(asoc->dup_tsns[i]);
10646                         dup++;
10647                         num_dups++;
10648                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10649                                 /* no more room */
10650                                 break;
10651                         }
10652                 }
10653                 asoc->numduptsns = 0;
10654         }
10655         /*
10656          * now that the chunk is prepared queue it to the control chunk
10657          * queue.
10658          */
10659         if (type == SCTP_SELECTIVE_ACK) {
10660                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10661                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10662                     num_dups * sizeof(int32_t);
10663                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10664                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10665                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10666                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10667                 sack->sack.num_dup_tsns = htons(num_dups);
10668                 sack->ch.chunk_type = type;
10669                 sack->ch.chunk_flags = flags;
10670                 sack->ch.chunk_length = htons(a_chk->send_size);
10671         } else {
10672                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10673                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10674                     num_dups * sizeof(int32_t);
10675                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10676                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10677                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10678                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10679                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10680                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10681                 nr_sack->nr_sack.reserved = 0;
10682                 nr_sack->ch.chunk_type = type;
10683                 nr_sack->ch.chunk_flags = flags;
10684                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10685         }
10686         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10687         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10688         asoc->ctrl_queue_cnt++;
10689         asoc->send_sack = 0;
10690         SCTP_STAT_INCR(sctps_sendsacks);
10691         return;
10692 }
10693
10694 void
10695 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10696 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10697     SCTP_UNUSED
10698 #endif
10699 )
10700 {
10701         struct mbuf *m_abort;
10702         struct mbuf *m_out = NULL, *m_end = NULL;
10703         struct sctp_abort_chunk *abort = NULL;
10704         int sz;
10705         uint32_t auth_offset = 0;
10706         struct sctp_auth_chunk *auth = NULL;
10707         struct sctp_nets *net;
10708
10709         /*-
10710          * Add an AUTH chunk, if chunk requires it and save the offset into
10711          * the chain for AUTH
10712          */
10713         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10714             stcb->asoc.peer_auth_chunks)) {
10715                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10716                     stcb, SCTP_ABORT_ASSOCIATION);
10717                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10718         }
10719         SCTP_TCB_LOCK_ASSERT(stcb);
10720         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10721         if (m_abort == NULL) {
10722                 /* no mbuf's */
10723                 if (m_out)
10724                         sctp_m_freem(m_out);
10725                 return;
10726         }
10727         /* link in any error */
10728         SCTP_BUF_NEXT(m_abort) = operr;
10729         sz = 0;
10730         if (operr) {
10731                 struct mbuf *n;
10732
10733                 n = operr;
10734                 while (n) {
10735                         sz += SCTP_BUF_LEN(n);
10736                         n = SCTP_BUF_NEXT(n);
10737                 }
10738         }
10739         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10740         if (m_out == NULL) {
10741                 /* NO Auth chunk prepended, so reserve space in front */
10742                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10743                 m_out = m_abort;
10744         } else {
10745                 /* Put AUTH chunk at the front of the chain */
10746                 SCTP_BUF_NEXT(m_end) = m_abort;
10747         }
10748         if (stcb->asoc.alternate) {
10749                 net = stcb->asoc.alternate;
10750         } else {
10751                 net = stcb->asoc.primary_destination;
10752         }
10753         /* fill in the ABORT chunk */
10754         abort = mtod(m_abort, struct sctp_abort_chunk *);
10755         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10756         abort->ch.chunk_flags = 0;
10757         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10758
10759         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10760             (struct sockaddr *)&net->ro._l_addr,
10761             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10762             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10763             stcb->asoc.primary_destination->port, NULL,
10764             0, 0,
10765             so_locked);
10766         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10767 }
10768
10769 void
10770 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10771     struct sctp_nets *net,
10772     int reflect_vtag)
10773 {
10774         /* formulate and SEND a SHUTDOWN-COMPLETE */
10775         struct mbuf *m_shutdown_comp;
10776         struct sctp_shutdown_complete_chunk *shutdown_complete;
10777         uint32_t vtag;
10778         uint8_t flags;
10779
10780         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10781         if (m_shutdown_comp == NULL) {
10782                 /* no mbuf's */
10783                 return;
10784         }
10785         if (reflect_vtag) {
10786                 flags = SCTP_HAD_NO_TCB;
10787                 vtag = stcb->asoc.my_vtag;
10788         } else {
10789                 flags = 0;
10790                 vtag = stcb->asoc.peer_vtag;
10791         }
10792         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10793         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10794         shutdown_complete->ch.chunk_flags = flags;
10795         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10796         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10797         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10798             (struct sockaddr *)&net->ro._l_addr,
10799             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10800             stcb->sctp_ep->sctp_lport, stcb->rport,
10801             htonl(vtag),
10802             net->port, NULL,
10803             0, 0,
10804             SCTP_SO_NOT_LOCKED);
10805         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10806         return;
10807 }
10808
10809 static void
10810 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10811     struct sctphdr *sh, uint32_t vtag,
10812     uint8_t type, struct mbuf *cause,
10813     uint8_t use_mflowid, uint32_t mflowid,
10814     uint32_t vrf_id, uint16_t port)
10815 {
10816         struct mbuf *o_pak;
10817         struct mbuf *mout;
10818         struct sctphdr *shout;
10819         struct sctp_chunkhdr *ch;
10820         struct udphdr *udp;
10821         int len, cause_len, padding_len, ret;
10822
10823 #ifdef INET
10824         struct sockaddr_in *src_sin, *dst_sin;
10825         struct ip *ip;
10826
10827 #endif
10828 #ifdef INET6
10829         struct sockaddr_in6 *src_sin6, *dst_sin6;
10830         struct ip6_hdr *ip6;
10831
10832 #endif
10833
10834         /* Compute the length of the cause and add final padding. */
10835         cause_len = 0;
10836         if (cause != NULL) {
10837                 struct mbuf *m_at, *m_last = NULL;
10838
10839                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10840                         if (SCTP_BUF_NEXT(m_at) == NULL)
10841                                 m_last = m_at;
10842                         cause_len += SCTP_BUF_LEN(m_at);
10843                 }
10844                 padding_len = cause_len % 4;
10845                 if (padding_len != 0) {
10846                         padding_len = 4 - padding_len;
10847                 }
10848                 if (padding_len != 0) {
10849                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10850                                 sctp_m_freem(cause);
10851                                 return;
10852                         }
10853                 }
10854         } else {
10855                 padding_len = 0;
10856         }
10857         /* Get an mbuf for the header. */
10858         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10859         switch (dst->sa_family) {
10860 #ifdef INET
10861         case AF_INET:
10862                 len += sizeof(struct ip);
10863                 break;
10864 #endif
10865 #ifdef INET6
10866         case AF_INET6:
10867                 len += sizeof(struct ip6_hdr);
10868                 break;
10869 #endif
10870         default:
10871                 break;
10872         }
10873         if (port) {
10874                 len += sizeof(struct udphdr);
10875         }
10876         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10877         if (mout == NULL) {
10878                 if (cause) {
10879                         sctp_m_freem(cause);
10880                 }
10881                 return;
10882         }
10883         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10884         SCTP_BUF_LEN(mout) = len;
10885         SCTP_BUF_NEXT(mout) = cause;
10886         if (use_mflowid != 0) {
10887                 mout->m_pkthdr.flowid = mflowid;
10888                 mout->m_flags |= M_FLOWID;
10889         }
10890 #ifdef INET
10891         ip = NULL;
10892 #endif
10893 #ifdef INET6
10894         ip6 = NULL;
10895 #endif
10896         switch (dst->sa_family) {
10897 #ifdef INET
10898         case AF_INET:
10899                 src_sin = (struct sockaddr_in *)src;
10900                 dst_sin = (struct sockaddr_in *)dst;
10901                 ip = mtod(mout, struct ip *);
10902                 ip->ip_v = IPVERSION;
10903                 ip->ip_hl = (sizeof(struct ip) >> 2);
10904                 ip->ip_tos = 0;
10905                 ip->ip_id = ip_newid();
10906                 ip->ip_off = 0;
10907                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
10908                 if (port) {
10909                         ip->ip_p = IPPROTO_UDP;
10910                 } else {
10911                         ip->ip_p = IPPROTO_SCTP;
10912                 }
10913                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
10914                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
10915                 ip->ip_sum = 0;
10916                 len = sizeof(struct ip);
10917                 shout = (struct sctphdr *)((caddr_t)ip + len);
10918                 break;
10919 #endif
10920 #ifdef INET6
10921         case AF_INET6:
10922                 src_sin6 = (struct sockaddr_in6 *)src;
10923                 dst_sin6 = (struct sockaddr_in6 *)dst;
10924                 ip6 = mtod(mout, struct ip6_hdr *);
10925                 ip6->ip6_flow = htonl(0x60000000);
10926                 if (V_ip6_auto_flowlabel) {
10927                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
10928                 }
10929                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
10930                 if (port) {
10931                         ip6->ip6_nxt = IPPROTO_UDP;
10932                 } else {
10933                         ip6->ip6_nxt = IPPROTO_SCTP;
10934                 }
10935                 ip6->ip6_src = dst_sin6->sin6_addr;
10936                 ip6->ip6_dst = src_sin6->sin6_addr;
10937                 len = sizeof(struct ip6_hdr);
10938                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
10939                 break;
10940 #endif
10941         default:
10942                 len = 0;
10943                 shout = mtod(mout, struct sctphdr *);
10944                 break;
10945         }
10946         if (port) {
10947                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
10948                         sctp_m_freem(mout);
10949                         return;
10950                 }
10951                 udp = (struct udphdr *)shout;
10952                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
10953                 udp->uh_dport = port;
10954                 udp->uh_sum = 0;
10955                 udp->uh_ulen = htons(sizeof(struct udphdr) +
10956                     sizeof(struct sctphdr) +
10957                     sizeof(struct sctp_chunkhdr) +
10958                     cause_len + padding_len);
10959                 len += sizeof(struct udphdr);
10960                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
10961         } else {
10962                 udp = NULL;
10963         }
10964         shout->src_port = sh->dest_port;
10965         shout->dest_port = sh->src_port;
10966         shout->checksum = 0;
10967         if (vtag) {
10968                 shout->v_tag = htonl(vtag);
10969         } else {
10970                 shout->v_tag = sh->v_tag;
10971         }
10972         len += sizeof(struct sctphdr);
10973         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
10974         ch->chunk_type = type;
10975         if (vtag) {
10976                 ch->chunk_flags = 0;
10977         } else {
10978                 ch->chunk_flags = SCTP_HAD_NO_TCB;
10979         }
10980         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
10981         len += sizeof(struct sctp_chunkhdr);
10982         len += cause_len + padding_len;
10983
10984         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10985                 sctp_m_freem(mout);
10986                 return;
10987         }
10988         SCTP_ATTACH_CHAIN(o_pak, mout, len);
10989         switch (dst->sa_family) {
10990 #ifdef INET
10991         case AF_INET:
10992                 if (port) {
10993                         if (V_udp_cksum) {
10994                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
10995                         } else {
10996                                 udp->uh_sum = 0;
10997                         }
10998                 }
10999                 ip->ip_len = len;
11000                 if (port) {
11001 #if defined(SCTP_WITH_NO_CSUM)
11002                         SCTP_STAT_INCR(sctps_sendnocrc);
11003 #else
11004                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11005                         SCTP_STAT_INCR(sctps_sendswcrc);
11006 #endif
11007                         if (V_udp_cksum) {
11008                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11009                         }
11010                 } else {
11011 #if defined(SCTP_WITH_NO_CSUM)
11012                         SCTP_STAT_INCR(sctps_sendnocrc);
11013 #else
11014                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11015                         mout->m_pkthdr.csum_data = 0;
11016                         SCTP_STAT_INCR(sctps_sendhwcrc);
11017 #endif
11018                 }
11019 #ifdef SCTP_PACKET_LOGGING
11020                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11021                         sctp_packet_log(o_pak);
11022                 }
11023 #endif
11024                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11025                 break;
11026 #endif
11027 #ifdef INET6
11028         case AF_INET6:
11029                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11030                 if (port) {
11031 #if defined(SCTP_WITH_NO_CSUM)
11032                         SCTP_STAT_INCR(sctps_sendnocrc);
11033 #else
11034                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11035                         SCTP_STAT_INCR(sctps_sendswcrc);
11036 #endif
11037                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11038                                 udp->uh_sum = 0xffff;
11039                         }
11040                 } else {
11041 #if defined(SCTP_WITH_NO_CSUM)
11042                         SCTP_STAT_INCR(sctps_sendnocrc);
11043 #else
11044                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11045                         mout->m_pkthdr.csum_data = 0;
11046                         SCTP_STAT_INCR(sctps_sendhwcrc);
11047 #endif
11048                 }
11049 #ifdef SCTP_PACKET_LOGGING
11050                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11051                         sctp_packet_log(o_pak);
11052                 }
11053 #endif
11054                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11055                 break;
11056 #endif
11057         default:
11058                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11059                     dst->sa_family);
11060                 sctp_m_freem(mout);
11061                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11062                 return;
11063         }
11064         SCTP_STAT_INCR(sctps_sendpackets);
11065         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11066         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11067         return;
11068 }
11069
11070 void
11071 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11072     struct sctphdr *sh,
11073     uint8_t use_mflowid, uint32_t mflowid,
11074     uint32_t vrf_id, uint16_t port)
11075 {
11076         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11077             use_mflowid, mflowid,
11078             vrf_id, port);
11079 }
11080
11081 void
11082 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11083 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11084     SCTP_UNUSED
11085 #endif
11086 )
11087 {
11088         struct sctp_tmit_chunk *chk;
11089         struct sctp_heartbeat_chunk *hb;
11090         struct timeval now;
11091
11092         SCTP_TCB_LOCK_ASSERT(stcb);
11093         if (net == NULL) {
11094                 return;
11095         }
11096         (void)SCTP_GETTIME_TIMEVAL(&now);
11097         switch (net->ro._l_addr.sa.sa_family) {
11098 #ifdef INET
11099         case AF_INET:
11100                 break;
11101 #endif
11102 #ifdef INET6
11103         case AF_INET6:
11104                 break;
11105 #endif
11106         default:
11107                 return;
11108         }
11109         sctp_alloc_a_chunk(stcb, chk);
11110         if (chk == NULL) {
11111                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11112                 return;
11113         }
11114         chk->copy_by_ref = 0;
11115         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11116         chk->rec.chunk_id.can_take_data = 1;
11117         chk->asoc = &stcb->asoc;
11118         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11119
11120         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11121         if (chk->data == NULL) {
11122                 sctp_free_a_chunk(stcb, chk, so_locked);
11123                 return;
11124         }
11125         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11126         SCTP_BUF_LEN(chk->data) = chk->send_size;
11127         chk->sent = SCTP_DATAGRAM_UNSENT;
11128         chk->snd_count = 0;
11129         chk->whoTo = net;
11130         atomic_add_int(&chk->whoTo->ref_count, 1);
11131         /* Now we have a mbuf that we can fill in with the details */
11132         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11133         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11134         /* fill out chunk header */
11135         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11136         hb->ch.chunk_flags = 0;
11137         hb->ch.chunk_length = htons(chk->send_size);
11138         /* Fill out hb parameter */
11139         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11140         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11141         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11142         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11143         /* Did our user request this one, put it in */
11144         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11145         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11146         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11147                 /*
11148                  * we only take from the entropy pool if the address is not
11149                  * confirmed.
11150                  */
11151                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11152                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11153         } else {
11154                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11155                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11156         }
11157         switch (net->ro._l_addr.sa.sa_family) {
11158 #ifdef INET
11159         case AF_INET:
11160                 memcpy(hb->heartbeat.hb_info.address,
11161                     &net->ro._l_addr.sin.sin_addr,
11162                     sizeof(net->ro._l_addr.sin.sin_addr));
11163                 break;
11164 #endif
11165 #ifdef INET6
11166         case AF_INET6:
11167                 memcpy(hb->heartbeat.hb_info.address,
11168                     &net->ro._l_addr.sin6.sin6_addr,
11169                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11170                 break;
11171 #endif
11172         default:
11173                 return;
11174                 break;
11175         }
11176         net->hb_responded = 0;
11177         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11178         stcb->asoc.ctrl_queue_cnt++;
11179         SCTP_STAT_INCR(sctps_sendheartbeat);
11180         return;
11181 }
11182
11183 void
11184 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11185     uint32_t high_tsn)
11186 {
11187         struct sctp_association *asoc;
11188         struct sctp_ecne_chunk *ecne;
11189         struct sctp_tmit_chunk *chk;
11190
11191         if (net == NULL) {
11192                 return;
11193         }
11194         asoc = &stcb->asoc;
11195         SCTP_TCB_LOCK_ASSERT(stcb);
11196         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11197                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11198                         /* found a previous ECN_ECHO update it if needed */
11199                         uint32_t cnt, ctsn;
11200
11201                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11202                         ctsn = ntohl(ecne->tsn);
11203                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11204                                 ecne->tsn = htonl(high_tsn);
11205                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11206                         }
11207                         cnt = ntohl(ecne->num_pkts_since_cwr);
11208                         cnt++;
11209                         ecne->num_pkts_since_cwr = htonl(cnt);
11210                         return;
11211                 }
11212         }
11213         /* nope could not find one to update so we must build one */
11214         sctp_alloc_a_chunk(stcb, chk);
11215         if (chk == NULL) {
11216                 return;
11217         }
11218         chk->copy_by_ref = 0;
11219         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11220         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11221         chk->rec.chunk_id.can_take_data = 0;
11222         chk->asoc = &stcb->asoc;
11223         chk->send_size = sizeof(struct sctp_ecne_chunk);
11224         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11225         if (chk->data == NULL) {
11226                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11227                 return;
11228         }
11229         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11230         SCTP_BUF_LEN(chk->data) = chk->send_size;
11231         chk->sent = SCTP_DATAGRAM_UNSENT;
11232         chk->snd_count = 0;
11233         chk->whoTo = net;
11234         atomic_add_int(&chk->whoTo->ref_count, 1);
11235
11236         stcb->asoc.ecn_echo_cnt_onq++;
11237         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11238         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11239         ecne->ch.chunk_flags = 0;
11240         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11241         ecne->tsn = htonl(high_tsn);
11242         ecne->num_pkts_since_cwr = htonl(1);
11243         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11244         asoc->ctrl_queue_cnt++;
11245 }
11246
11247 void
11248 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11249     struct mbuf *m, int len, int iphlen, int bad_crc)
11250 {
11251         struct sctp_association *asoc;
11252         struct sctp_pktdrop_chunk *drp;
11253         struct sctp_tmit_chunk *chk;
11254         uint8_t *datap;
11255         int was_trunc = 0;
11256         int fullsz = 0;
11257         long spc;
11258         int offset;
11259         struct sctp_chunkhdr *ch, chunk_buf;
11260         unsigned int chk_length;
11261
11262         if (!stcb) {
11263                 return;
11264         }
11265         asoc = &stcb->asoc;
11266         SCTP_TCB_LOCK_ASSERT(stcb);
11267         if (asoc->peer_supports_pktdrop == 0) {
11268                 /*-
11269                  * peer must declare support before I send one.
11270                  */
11271                 return;
11272         }
11273         if (stcb->sctp_socket == NULL) {
11274                 return;
11275         }
11276         sctp_alloc_a_chunk(stcb, chk);
11277         if (chk == NULL) {
11278                 return;
11279         }
11280         chk->copy_by_ref = 0;
11281         len -= iphlen;
11282         chk->send_size = len;
11283         /* Validate that we do not have an ABORT in here. */
11284         offset = iphlen + sizeof(struct sctphdr);
11285         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11286             sizeof(*ch), (uint8_t *) & chunk_buf);
11287         while (ch != NULL) {
11288                 chk_length = ntohs(ch->chunk_length);
11289                 if (chk_length < sizeof(*ch)) {
11290                         /* break to abort land */
11291                         break;
11292                 }
11293                 switch (ch->chunk_type) {
11294                 case SCTP_PACKET_DROPPED:
11295                 case SCTP_ABORT_ASSOCIATION:
11296                 case SCTP_INITIATION_ACK:
11297                         /**
11298                          * We don't respond with an PKT-DROP to an ABORT
11299                          * or PKT-DROP. We also do not respond to an
11300                          * INIT-ACK, because we can't know if the initiation
11301                          * tag is correct or not.
11302                          */
11303                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11304                         return;
11305                 default:
11306                         break;
11307                 }
11308                 offset += SCTP_SIZE32(chk_length);
11309                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11310                     sizeof(*ch), (uint8_t *) & chunk_buf);
11311         }
11312
11313         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11314             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11315                 /*
11316                  * only send 1 mtu worth, trim off the excess on the end.
11317                  */
11318                 fullsz = len;
11319                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11320                 was_trunc = 1;
11321         }
11322         chk->asoc = &stcb->asoc;
11323         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11324         if (chk->data == NULL) {
11325 jump_out:
11326                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11327                 return;
11328         }
11329         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11330         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11331         if (drp == NULL) {
11332                 sctp_m_freem(chk->data);
11333                 chk->data = NULL;
11334                 goto jump_out;
11335         }
11336         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11337             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11338         chk->book_size_scale = 0;
11339         if (was_trunc) {
11340                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11341                 drp->trunc_len = htons(fullsz);
11342                 /*
11343                  * Len is already adjusted to size minus overhead above take
11344                  * out the pkt_drop chunk itself from it.
11345                  */
11346                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11347                 len = chk->send_size;
11348         } else {
11349                 /* no truncation needed */
11350                 drp->ch.chunk_flags = 0;
11351                 drp->trunc_len = htons(0);
11352         }
11353         if (bad_crc) {
11354                 drp->ch.chunk_flags |= SCTP_BADCRC;
11355         }
11356         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11357         SCTP_BUF_LEN(chk->data) = chk->send_size;
11358         chk->sent = SCTP_DATAGRAM_UNSENT;
11359         chk->snd_count = 0;
11360         if (net) {
11361                 /* we should hit here */
11362                 chk->whoTo = net;
11363                 atomic_add_int(&chk->whoTo->ref_count, 1);
11364         } else {
11365                 chk->whoTo = NULL;
11366         }
11367         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11368         chk->rec.chunk_id.can_take_data = 1;
11369         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11370         drp->ch.chunk_length = htons(chk->send_size);
11371         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11372         if (spc < 0) {
11373                 spc = 0;
11374         }
11375         drp->bottle_bw = htonl(spc);
11376         if (asoc->my_rwnd) {
11377                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11378                     asoc->size_on_all_streams +
11379                     asoc->my_rwnd_control_len +
11380                     stcb->sctp_socket->so_rcv.sb_cc);
11381         } else {
11382                 /*-
11383                  * If my rwnd is 0, possibly from mbuf depletion as well as
11384                  * space used, tell the peer there is NO space aka onq == bw
11385                  */
11386                 drp->current_onq = htonl(spc);
11387         }
11388         drp->reserved = 0;
11389         datap = drp->data;
11390         m_copydata(m, iphlen, len, (caddr_t)datap);
11391         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11392         asoc->ctrl_queue_cnt++;
11393 }
11394
11395 void
11396 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11397 {
11398         struct sctp_association *asoc;
11399         struct sctp_cwr_chunk *cwr;
11400         struct sctp_tmit_chunk *chk;
11401
11402         asoc = &stcb->asoc;
11403         SCTP_TCB_LOCK_ASSERT(stcb);
11404         if (net == NULL) {
11405                 return;
11406         }
11407         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11408                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11409                         /*
11410                          * found a previous CWR queued to same destination
11411                          * update it if needed
11412                          */
11413                         uint32_t ctsn;
11414
11415                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11416                         ctsn = ntohl(cwr->tsn);
11417                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11418                                 cwr->tsn = htonl(high_tsn);
11419                         }
11420                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11421                                 /* Make sure override is carried */
11422                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11423                         }
11424                         return;
11425                 }
11426         }
11427         sctp_alloc_a_chunk(stcb, chk);
11428         if (chk == NULL) {
11429                 return;
11430         }
11431         chk->copy_by_ref = 0;
11432         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11433         chk->rec.chunk_id.can_take_data = 1;
11434         chk->asoc = &stcb->asoc;
11435         chk->send_size = sizeof(struct sctp_cwr_chunk);
11436         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11437         if (chk->data == NULL) {
11438                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11439                 return;
11440         }
11441         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11442         SCTP_BUF_LEN(chk->data) = chk->send_size;
11443         chk->sent = SCTP_DATAGRAM_UNSENT;
11444         chk->snd_count = 0;
11445         chk->whoTo = net;
11446         atomic_add_int(&chk->whoTo->ref_count, 1);
11447         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11448         cwr->ch.chunk_type = SCTP_ECN_CWR;
11449         cwr->ch.chunk_flags = override;
11450         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11451         cwr->tsn = htonl(high_tsn);
11452         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11453         asoc->ctrl_queue_cnt++;
11454 }
11455
11456 void
11457 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11458     int number_entries, uint16_t * list,
11459     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11460 {
11461         int len, old_len, i;
11462         struct sctp_stream_reset_out_request *req_out;
11463         struct sctp_chunkhdr *ch;
11464
11465         ch = mtod(chk->data, struct sctp_chunkhdr *);
11466
11467
11468         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11469
11470         /* get to new offset for the param. */
11471         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11472         /* now how long will this param be? */
11473         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11474         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11475         req_out->ph.param_length = htons(len);
11476         req_out->request_seq = htonl(seq);
11477         req_out->response_seq = htonl(resp_seq);
11478         req_out->send_reset_at_tsn = htonl(last_sent);
11479         if (number_entries) {
11480                 for (i = 0; i < number_entries; i++) {
11481                         req_out->list_of_streams[i] = htons(list[i]);
11482                 }
11483         }
11484         if (SCTP_SIZE32(len) > len) {
11485                 /*-
11486                  * Need to worry about the pad we may end up adding to the
11487                  * end. This is easy since the struct is either aligned to 4
11488                  * bytes or 2 bytes off.
11489                  */
11490                 req_out->list_of_streams[number_entries] = 0;
11491         }
11492         /* now fix the chunk length */
11493         ch->chunk_length = htons(len + old_len);
11494         chk->book_size = len + old_len;
11495         chk->book_size_scale = 0;
11496         chk->send_size = SCTP_SIZE32(chk->book_size);
11497         SCTP_BUF_LEN(chk->data) = chk->send_size;
11498         return;
11499 }
11500
11501
11502 void
11503 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11504     int number_entries, uint16_t * list,
11505     uint32_t seq)
11506 {
11507         int len, old_len, i;
11508         struct sctp_stream_reset_in_request *req_in;
11509         struct sctp_chunkhdr *ch;
11510
11511         ch = mtod(chk->data, struct sctp_chunkhdr *);
11512
11513
11514         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11515
11516         /* get to new offset for the param. */
11517         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11518         /* now how long will this param be? */
11519         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11520         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11521         req_in->ph.param_length = htons(len);
11522         req_in->request_seq = htonl(seq);
11523         if (number_entries) {
11524                 for (i = 0; i < number_entries; i++) {
11525                         req_in->list_of_streams[i] = htons(list[i]);
11526                 }
11527         }
11528         if (SCTP_SIZE32(len) > len) {
11529                 /*-
11530                  * Need to worry about the pad we may end up adding to the
11531                  * end. This is easy since the struct is either aligned to 4
11532                  * bytes or 2 bytes off.
11533                  */
11534                 req_in->list_of_streams[number_entries] = 0;
11535         }
11536         /* now fix the chunk length */
11537         ch->chunk_length = htons(len + old_len);
11538         chk->book_size = len + old_len;
11539         chk->book_size_scale = 0;
11540         chk->send_size = SCTP_SIZE32(chk->book_size);
11541         SCTP_BUF_LEN(chk->data) = chk->send_size;
11542         return;
11543 }
11544
11545
11546 void
11547 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11548     uint32_t seq)
11549 {
11550         int len, old_len;
11551         struct sctp_stream_reset_tsn_request *req_tsn;
11552         struct sctp_chunkhdr *ch;
11553
11554         ch = mtod(chk->data, struct sctp_chunkhdr *);
11555
11556
11557         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11558
11559         /* get to new offset for the param. */
11560         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11561         /* now how long will this param be? */
11562         len = sizeof(struct sctp_stream_reset_tsn_request);
11563         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11564         req_tsn->ph.param_length = htons(len);
11565         req_tsn->request_seq = htonl(seq);
11566
11567         /* now fix the chunk length */
11568         ch->chunk_length = htons(len + old_len);
11569         chk->send_size = len + old_len;
11570         chk->book_size = SCTP_SIZE32(chk->send_size);
11571         chk->book_size_scale = 0;
11572         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11573         return;
11574 }
11575
11576 void
11577 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11578     uint32_t resp_seq, uint32_t result)
11579 {
11580         int len, old_len;
11581         struct sctp_stream_reset_response *resp;
11582         struct sctp_chunkhdr *ch;
11583
11584         ch = mtod(chk->data, struct sctp_chunkhdr *);
11585
11586
11587         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11588
11589         /* get to new offset for the param. */
11590         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11591         /* now how long will this param be? */
11592         len = sizeof(struct sctp_stream_reset_response);
11593         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11594         resp->ph.param_length = htons(len);
11595         resp->response_seq = htonl(resp_seq);
11596         resp->result = ntohl(result);
11597
11598         /* now fix the chunk length */
11599         ch->chunk_length = htons(len + old_len);
11600         chk->book_size = len + old_len;
11601         chk->book_size_scale = 0;
11602         chk->send_size = SCTP_SIZE32(chk->book_size);
11603         SCTP_BUF_LEN(chk->data) = chk->send_size;
11604         return;
11605
11606 }
11607
11608
11609 void
11610 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11611     uint32_t resp_seq, uint32_t result,
11612     uint32_t send_una, uint32_t recv_next)
11613 {
11614         int len, old_len;
11615         struct sctp_stream_reset_response_tsn *resp;
11616         struct sctp_chunkhdr *ch;
11617
11618         ch = mtod(chk->data, struct sctp_chunkhdr *);
11619
11620
11621         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11622
11623         /* get to new offset for the param. */
11624         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11625         /* now how long will this param be? */
11626         len = sizeof(struct sctp_stream_reset_response_tsn);
11627         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11628         resp->ph.param_length = htons(len);
11629         resp->response_seq = htonl(resp_seq);
11630         resp->result = htonl(result);
11631         resp->senders_next_tsn = htonl(send_una);
11632         resp->receivers_next_tsn = htonl(recv_next);
11633
11634         /* now fix the chunk length */
11635         ch->chunk_length = htons(len + old_len);
11636         chk->book_size = len + old_len;
11637         chk->send_size = SCTP_SIZE32(chk->book_size);
11638         chk->book_size_scale = 0;
11639         SCTP_BUF_LEN(chk->data) = chk->send_size;
11640         return;
11641 }
11642
11643 static void
11644 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11645     uint32_t seq,
11646     uint16_t adding)
11647 {
11648         int len, old_len;
11649         struct sctp_chunkhdr *ch;
11650         struct sctp_stream_reset_add_strm *addstr;
11651
11652         ch = mtod(chk->data, struct sctp_chunkhdr *);
11653         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11654
11655         /* get to new offset for the param. */
11656         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11657         /* now how long will this param be? */
11658         len = sizeof(struct sctp_stream_reset_add_strm);
11659
11660         /* Fill it out. */
11661         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11662         addstr->ph.param_length = htons(len);
11663         addstr->request_seq = htonl(seq);
11664         addstr->number_of_streams = htons(adding);
11665         addstr->reserved = 0;
11666
11667         /* now fix the chunk length */
11668         ch->chunk_length = htons(len + old_len);
11669         chk->send_size = len + old_len;
11670         chk->book_size = SCTP_SIZE32(chk->send_size);
11671         chk->book_size_scale = 0;
11672         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11673         return;
11674 }
11675
11676 static void
11677 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11678     uint32_t seq,
11679     uint16_t adding)
11680 {
11681         int len, old_len;
11682         struct sctp_chunkhdr *ch;
11683         struct sctp_stream_reset_add_strm *addstr;
11684
11685         ch = mtod(chk->data, struct sctp_chunkhdr *);
11686         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11687
11688         /* get to new offset for the param. */
11689         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11690         /* now how long will this param be? */
11691         len = sizeof(struct sctp_stream_reset_add_strm);
11692         /* Fill it out. */
11693         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11694         addstr->ph.param_length = htons(len);
11695         addstr->request_seq = htonl(seq);
11696         addstr->number_of_streams = htons(adding);
11697         addstr->reserved = 0;
11698
11699         /* now fix the chunk length */
11700         ch->chunk_length = htons(len + old_len);
11701         chk->send_size = len + old_len;
11702         chk->book_size = SCTP_SIZE32(chk->send_size);
11703         chk->book_size_scale = 0;
11704         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11705         return;
11706 }
11707
11708
11709
11710 int
11711 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11712     int number_entries, uint16_t * list,
11713     uint8_t send_out_req,
11714     uint8_t send_in_req,
11715     uint8_t send_tsn_req,
11716     uint8_t add_stream,
11717     uint16_t adding_o,
11718     uint16_t adding_i, uint8_t peer_asked
11719 )
11720 {
11721
11722         struct sctp_association *asoc;
11723         struct sctp_tmit_chunk *chk;
11724         struct sctp_chunkhdr *ch;
11725         uint32_t seq;
11726
11727         asoc = &stcb->asoc;
11728         if (asoc->stream_reset_outstanding) {
11729                 /*-
11730                  * Already one pending, must get ACK back to clear the flag.
11731                  */
11732                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11733                 return (EBUSY);
11734         }
11735         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11736             (add_stream == 0)) {
11737                 /* nothing to do */
11738                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11739                 return (EINVAL);
11740         }
11741         if (send_tsn_req && (send_out_req || send_in_req)) {
11742                 /* error, can't do that */
11743                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11744                 return (EINVAL);
11745         }
11746         sctp_alloc_a_chunk(stcb, chk);
11747         if (chk == NULL) {
11748                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11749                 return (ENOMEM);
11750         }
11751         chk->copy_by_ref = 0;
11752         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11753         chk->rec.chunk_id.can_take_data = 0;
11754         chk->asoc = &stcb->asoc;
11755         chk->book_size = sizeof(struct sctp_chunkhdr);
11756         chk->send_size = SCTP_SIZE32(chk->book_size);
11757         chk->book_size_scale = 0;
11758
11759         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11760         if (chk->data == NULL) {
11761                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11762                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11763                 return (ENOMEM);
11764         }
11765         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11766
11767         /* setup chunk parameters */
11768         chk->sent = SCTP_DATAGRAM_UNSENT;
11769         chk->snd_count = 0;
11770         if (stcb->asoc.alternate) {
11771                 chk->whoTo = stcb->asoc.alternate;
11772         } else {
11773                 chk->whoTo = stcb->asoc.primary_destination;
11774         }
11775         atomic_add_int(&chk->whoTo->ref_count, 1);
11776         ch = mtod(chk->data, struct sctp_chunkhdr *);
11777         ch->chunk_type = SCTP_STREAM_RESET;
11778         ch->chunk_flags = 0;
11779         ch->chunk_length = htons(chk->book_size);
11780         SCTP_BUF_LEN(chk->data) = chk->send_size;
11781
11782         seq = stcb->asoc.str_reset_seq_out;
11783         if (send_out_req) {
11784                 sctp_add_stream_reset_out(chk, number_entries, list,
11785                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11786                 asoc->stream_reset_out_is_outstanding = 1;
11787                 seq++;
11788                 asoc->stream_reset_outstanding++;
11789         }
11790         if ((add_stream & 1) &&
11791             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11792                 /* Need to allocate more */
11793                 struct sctp_stream_out *oldstream;
11794                 struct sctp_stream_queue_pending *sp, *nsp;
11795                 int i;
11796
11797                 oldstream = stcb->asoc.strmout;
11798                 /* get some more */
11799                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11800                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11801                     SCTP_M_STRMO);
11802                 if (stcb->asoc.strmout == NULL) {
11803                         uint8_t x;
11804
11805                         stcb->asoc.strmout = oldstream;
11806                         /* Turn off the bit */
11807                         x = add_stream & 0xfe;
11808                         add_stream = x;
11809                         goto skip_stuff;
11810                 }
11811                 /*
11812                  * Ok now we proceed with copying the old out stuff and
11813                  * initializing the new stuff.
11814                  */
11815                 SCTP_TCB_SEND_LOCK(stcb);
11816                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11817                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11818                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11819                         stcb->asoc.strmout[i].next_sequence_sent = oldstream[i].next_sequence_sent;
11820                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11821                         stcb->asoc.strmout[i].stream_no = i;
11822                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11823                         /* now anything on those queues? */
11824                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11825                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11826                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11827                         }
11828                         /* Now move assoc pointers too */
11829                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11830                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11831                         }
11832                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11833                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11834                         }
11835                 }
11836                 /* now the new streams */
11837                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11838                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11839                         stcb->asoc.strmout[i].next_sequence_sent = 0x0;
11840                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11841                         stcb->asoc.strmout[i].stream_no = i;
11842                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11843                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11844                 }
11845                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11846                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11847                 SCTP_TCB_SEND_UNLOCK(stcb);
11848         }
11849 skip_stuff:
11850         if ((add_stream & 1) && (adding_o > 0)) {
11851                 asoc->strm_pending_add_size = adding_o;
11852                 asoc->peer_req_out = peer_asked;
11853                 sctp_add_an_out_stream(chk, seq, adding_o);
11854                 seq++;
11855                 asoc->stream_reset_outstanding++;
11856         }
11857         if ((add_stream & 2) && (adding_i > 0)) {
11858                 sctp_add_an_in_stream(chk, seq, adding_i);
11859                 seq++;
11860                 asoc->stream_reset_outstanding++;
11861         }
11862         if (send_in_req) {
11863                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11864                 seq++;
11865                 asoc->stream_reset_outstanding++;
11866         }
11867         if (send_tsn_req) {
11868                 sctp_add_stream_reset_tsn(chk, seq);
11869                 asoc->stream_reset_outstanding++;
11870         }
11871         asoc->str_reset = chk;
11872         /* insert the chunk for sending */
11873         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11874             chk,
11875             sctp_next);
11876         asoc->ctrl_queue_cnt++;
11877         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11878         return (0);
11879 }
11880
11881 void
11882 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
11883     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11884     uint8_t use_mflowid, uint32_t mflowid,
11885     uint32_t vrf_id, uint16_t port)
11886 {
11887         /* Don't respond to an ABORT with an ABORT. */
11888         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11889                 if (cause)
11890                         sctp_m_freem(cause);
11891                 return;
11892         }
11893         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11894             use_mflowid, mflowid,
11895             vrf_id, port);
11896         return;
11897 }
11898
11899 void
11900 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
11901     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
11902     uint8_t use_mflowid, uint32_t mflowid,
11903     uint32_t vrf_id, uint16_t port)
11904 {
11905         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
11906             use_mflowid, mflowid,
11907             vrf_id, port);
11908         return;
11909 }
11910
11911 static struct mbuf *
11912 sctp_copy_resume(struct uio *uio,
11913     int max_send_len,
11914     int user_marks_eor,
11915     int *error,
11916     uint32_t * sndout,
11917     struct mbuf **new_tail)
11918 {
11919         struct mbuf *m;
11920
11921         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11922             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11923         if (m == NULL) {
11924                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11925                 *error = ENOMEM;
11926         } else {
11927                 *sndout = m_length(m, NULL);
11928                 *new_tail = m_last(m);
11929         }
11930         return (m);
11931 }
11932
11933 static int
11934 sctp_copy_one(struct sctp_stream_queue_pending *sp,
11935     struct uio *uio,
11936     int resv_upfront)
11937 {
11938         int left;
11939
11940         left = sp->length;
11941         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
11942             resv_upfront, 0);
11943         if (sp->data == NULL) {
11944                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11945                 return (ENOMEM);
11946         }
11947         sp->tail_mbuf = m_last(sp->data);
11948         return (0);
11949 }
11950
11951
11952
11953 static struct sctp_stream_queue_pending *
11954 sctp_copy_it_in(struct sctp_tcb *stcb,
11955     struct sctp_association *asoc,
11956     struct sctp_sndrcvinfo *srcv,
11957     struct uio *uio,
11958     struct sctp_nets *net,
11959     int max_send_len,
11960     int user_marks_eor,
11961     int *error)
11962 {
11963         /*-
11964          * This routine must be very careful in its work. Protocol
11965          * processing is up and running so care must be taken to spl...()
11966          * when you need to do something that may effect the stcb/asoc. The
11967          * sb is locked however. When data is copied the protocol processing
11968          * should be enabled since this is a slower operation...
11969          */
11970         struct sctp_stream_queue_pending *sp = NULL;
11971         int resv_in_first;
11972
11973         *error = 0;
11974         /* Now can we send this? */
11975         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11976             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11977             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11978             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11979                 /* got data while shutting down */
11980                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11981                 *error = ECONNRESET;
11982                 goto out_now;
11983         }
11984         sctp_alloc_a_strmoq(stcb, sp);
11985         if (sp == NULL) {
11986                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11987                 *error = ENOMEM;
11988                 goto out_now;
11989         }
11990         sp->act_flags = 0;
11991         sp->sender_all_done = 0;
11992         sp->sinfo_flags = srcv->sinfo_flags;
11993         sp->timetolive = srcv->sinfo_timetolive;
11994         sp->ppid = srcv->sinfo_ppid;
11995         sp->context = srcv->sinfo_context;
11996         sp->strseq = 0;
11997         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
11998
11999         sp->stream = srcv->sinfo_stream;
12000         sp->length = min(uio->uio_resid, max_send_len);
12001         if ((sp->length == (uint32_t) uio->uio_resid) &&
12002             ((user_marks_eor == 0) ||
12003             (srcv->sinfo_flags & SCTP_EOF) ||
12004             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12005                 sp->msg_is_complete = 1;
12006         } else {
12007                 sp->msg_is_complete = 0;
12008         }
12009         sp->sender_all_done = 0;
12010         sp->some_taken = 0;
12011         sp->put_last_out = 0;
12012         resv_in_first = sizeof(struct sctp_data_chunk);
12013         sp->data = sp->tail_mbuf = NULL;
12014         if (sp->length == 0) {
12015                 *error = 0;
12016                 goto skip_copy;
12017         }
12018         if (srcv->sinfo_keynumber_valid) {
12019                 sp->auth_keyid = srcv->sinfo_keynumber;
12020         } else {
12021                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12022         }
12023         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12024                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12025                 sp->holds_key_ref = 1;
12026         }
12027         *error = sctp_copy_one(sp, uio, resv_in_first);
12028 skip_copy:
12029         if (*error) {
12030                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12031                 sp = NULL;
12032         } else {
12033                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12034                         sp->net = net;
12035                         atomic_add_int(&sp->net->ref_count, 1);
12036                 } else {
12037                         sp->net = NULL;
12038                 }
12039                 sctp_set_prsctp_policy(sp);
12040         }
12041 out_now:
12042         return (sp);
12043 }
12044
12045
12046 int
12047 sctp_sosend(struct socket *so,
12048     struct sockaddr *addr,
12049     struct uio *uio,
12050     struct mbuf *top,
12051     struct mbuf *control,
12052     int flags,
12053     struct thread *p
12054 )
12055 {
12056         int error, use_sndinfo = 0;
12057         struct sctp_sndrcvinfo sndrcvninfo;
12058         struct sockaddr *addr_to_use;
12059
12060 #if defined(INET) && defined(INET6)
12061         struct sockaddr_in sin;
12062
12063 #endif
12064
12065         if (control) {
12066                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12067                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12068                     sizeof(sndrcvninfo))) {
12069                         /* got one */
12070                         use_sndinfo = 1;
12071                 }
12072         }
12073         addr_to_use = addr;
12074 #if defined(INET) && defined(INET6)
12075         if ((addr) && (addr->sa_family == AF_INET6)) {
12076                 struct sockaddr_in6 *sin6;
12077
12078                 sin6 = (struct sockaddr_in6 *)addr;
12079                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12080                         in6_sin6_2_sin(&sin, sin6);
12081                         addr_to_use = (struct sockaddr *)&sin;
12082                 }
12083         }
12084 #endif
12085         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12086             control,
12087             flags,
12088             use_sndinfo ? &sndrcvninfo : NULL
12089             ,p
12090             );
12091         return (error);
12092 }
12093
12094
12095 int
12096 sctp_lower_sosend(struct socket *so,
12097     struct sockaddr *addr,
12098     struct uio *uio,
12099     struct mbuf *i_pak,
12100     struct mbuf *control,
12101     int flags,
12102     struct sctp_sndrcvinfo *srcv
12103     ,
12104     struct thread *p
12105 )
12106 {
12107         unsigned int sndlen = 0, max_len;
12108         int error, len;
12109         struct mbuf *top = NULL;
12110         int queue_only = 0, queue_only_for_init = 0;
12111         int free_cnt_applied = 0;
12112         int un_sent;
12113         int now_filled = 0;
12114         unsigned int inqueue_bytes = 0;
12115         struct sctp_block_entry be;
12116         struct sctp_inpcb *inp;
12117         struct sctp_tcb *stcb = NULL;
12118         struct timeval now;
12119         struct sctp_nets *net;
12120         struct sctp_association *asoc;
12121         struct sctp_inpcb *t_inp;
12122         int user_marks_eor;
12123         int create_lock_applied = 0;
12124         int nagle_applies = 0;
12125         int some_on_control = 0;
12126         int got_all_of_the_send = 0;
12127         int hold_tcblock = 0;
12128         int non_blocking = 0;
12129         uint32_t local_add_more, local_soresv = 0;
12130         uint16_t port;
12131         uint16_t sinfo_flags;
12132         sctp_assoc_t sinfo_assoc_id;
12133
12134         error = 0;
12135         net = NULL;
12136         stcb = NULL;
12137         asoc = NULL;
12138
12139         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12140         if (inp == NULL) {
12141                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12142                 error = EINVAL;
12143                 if (i_pak) {
12144                         SCTP_RELEASE_PKT(i_pak);
12145                 }
12146                 return (error);
12147         }
12148         if ((uio == NULL) && (i_pak == NULL)) {
12149                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12150                 return (EINVAL);
12151         }
12152         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12153         atomic_add_int(&inp->total_sends, 1);
12154         if (uio) {
12155                 if (uio->uio_resid < 0) {
12156                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12157                         return (EINVAL);
12158                 }
12159                 sndlen = uio->uio_resid;
12160         } else {
12161                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12162                 sndlen = SCTP_HEADER_LEN(i_pak);
12163         }
12164         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12165             addr,
12166             sndlen);
12167         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12168             (inp->sctp_socket->so_qlimit)) {
12169                 /* The listener can NOT send */
12170                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12171                 error = ENOTCONN;
12172                 goto out_unlocked;
12173         }
12174         /**
12175          * Pre-screen address, if one is given the sin-len
12176          * must be set correctly!
12177          */
12178         if (addr) {
12179                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12180
12181                 switch (raddr->sa.sa_family) {
12182 #ifdef INET
12183                 case AF_INET:
12184                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12185                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12186                                 error = EINVAL;
12187                                 goto out_unlocked;
12188                         }
12189                         port = raddr->sin.sin_port;
12190                         break;
12191 #endif
12192 #ifdef INET6
12193                 case AF_INET6:
12194                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12195                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12196                                 error = EINVAL;
12197                                 goto out_unlocked;
12198                         }
12199                         port = raddr->sin6.sin6_port;
12200                         break;
12201 #endif
12202                 default:
12203                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12204                         error = EAFNOSUPPORT;
12205                         goto out_unlocked;
12206                 }
12207         } else
12208                 port = 0;
12209
12210         if (srcv) {
12211                 sinfo_flags = srcv->sinfo_flags;
12212                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12213                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12214                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12215                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12216                         error = EINVAL;
12217                         goto out_unlocked;
12218                 }
12219                 if (srcv->sinfo_flags)
12220                         SCTP_STAT_INCR(sctps_sends_with_flags);
12221         } else {
12222                 sinfo_flags = inp->def_send.sinfo_flags;
12223                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12224         }
12225         if (sinfo_flags & SCTP_SENDALL) {
12226                 /* its a sendall */
12227                 error = sctp_sendall(inp, uio, top, srcv);
12228                 top = NULL;
12229                 goto out_unlocked;
12230         }
12231         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12232                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12233                 error = EINVAL;
12234                 goto out_unlocked;
12235         }
12236         /* now we must find the assoc */
12237         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12238             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12239                 SCTP_INP_RLOCK(inp);
12240                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12241                 if (stcb) {
12242                         SCTP_TCB_LOCK(stcb);
12243                         hold_tcblock = 1;
12244                 }
12245                 SCTP_INP_RUNLOCK(inp);
12246         } else if (sinfo_assoc_id) {
12247                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12248         } else if (addr) {
12249                 /*-
12250                  * Since we did not use findep we must
12251                  * increment it, and if we don't find a tcb
12252                  * decrement it.
12253                  */
12254                 SCTP_INP_WLOCK(inp);
12255                 SCTP_INP_INCR_REF(inp);
12256                 SCTP_INP_WUNLOCK(inp);
12257                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12258                 if (stcb == NULL) {
12259                         SCTP_INP_WLOCK(inp);
12260                         SCTP_INP_DECR_REF(inp);
12261                         SCTP_INP_WUNLOCK(inp);
12262                 } else {
12263                         hold_tcblock = 1;
12264                 }
12265         }
12266         if ((stcb == NULL) && (addr)) {
12267                 /* Possible implicit send? */
12268                 SCTP_ASOC_CREATE_LOCK(inp);
12269                 create_lock_applied = 1;
12270                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12271                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12272                         /* Should I really unlock ? */
12273                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12274                         error = EINVAL;
12275                         goto out_unlocked;
12276
12277                 }
12278                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12279                     (addr->sa_family == AF_INET6)) {
12280                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12281                         error = EINVAL;
12282                         goto out_unlocked;
12283                 }
12284                 SCTP_INP_WLOCK(inp);
12285                 SCTP_INP_INCR_REF(inp);
12286                 SCTP_INP_WUNLOCK(inp);
12287                 /* With the lock applied look again */
12288                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12289                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12290                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12291                 }
12292                 if (stcb == NULL) {
12293                         SCTP_INP_WLOCK(inp);
12294                         SCTP_INP_DECR_REF(inp);
12295                         SCTP_INP_WUNLOCK(inp);
12296                 } else {
12297                         hold_tcblock = 1;
12298                 }
12299                 if (error) {
12300                         goto out_unlocked;
12301                 }
12302                 if (t_inp != inp) {
12303                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12304                         error = ENOTCONN;
12305                         goto out_unlocked;
12306                 }
12307         }
12308         if (stcb == NULL) {
12309                 if (addr == NULL) {
12310                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12311                         error = ENOENT;
12312                         goto out_unlocked;
12313                 } else {
12314                         /* We must go ahead and start the INIT process */
12315                         uint32_t vrf_id;
12316
12317                         if ((sinfo_flags & SCTP_ABORT) ||
12318                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12319                                 /*-
12320                                  * User asks to abort a non-existant assoc,
12321                                  * or EOF a non-existant assoc with no data
12322                                  */
12323                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12324                                 error = ENOENT;
12325                                 goto out_unlocked;
12326                         }
12327                         /* get an asoc/stcb struct */
12328                         vrf_id = inp->def_vrf_id;
12329 #ifdef INVARIANTS
12330                         if (create_lock_applied == 0) {
12331                                 panic("Error, should hold create lock and I don't?");
12332                         }
12333 #endif
12334                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12335                             p
12336                             );
12337                         if (stcb == NULL) {
12338                                 /* Error is setup for us in the call */
12339                                 goto out_unlocked;
12340                         }
12341                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12342                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12343                                 /*
12344                                  * Set the connected flag so we can queue
12345                                  * data
12346                                  */
12347                                 soisconnecting(so);
12348                         }
12349                         hold_tcblock = 1;
12350                         if (create_lock_applied) {
12351                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12352                                 create_lock_applied = 0;
12353                         } else {
12354                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12355                         }
12356                         /*
12357                          * Turn on queue only flag to prevent data from
12358                          * being sent
12359                          */
12360                         queue_only = 1;
12361                         asoc = &stcb->asoc;
12362                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12363                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12364
12365                         /* initialize authentication params for the assoc */
12366                         sctp_initialize_auth_params(inp, stcb);
12367
12368                         if (control) {
12369                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12370                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12371                                         hold_tcblock = 0;
12372                                         stcb = NULL;
12373                                         goto out_unlocked;
12374                                 }
12375                         }
12376                         /* out with the INIT */
12377                         queue_only_for_init = 1;
12378                         /*-
12379                          * we may want to dig in after this call and adjust the MTU
12380                          * value. It defaulted to 1500 (constant) but the ro
12381                          * structure may now have an update and thus we may need to
12382                          * change it BEFORE we append the message.
12383                          */
12384                 }
12385         } else
12386                 asoc = &stcb->asoc;
12387         if (srcv == NULL)
12388                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12389         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12390                 if (addr)
12391                         net = sctp_findnet(stcb, addr);
12392                 else
12393                         net = NULL;
12394                 if ((net == NULL) ||
12395                     ((port != 0) && (port != stcb->rport))) {
12396                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12397                         error = EINVAL;
12398                         goto out_unlocked;
12399                 }
12400         } else {
12401                 if (stcb->asoc.alternate) {
12402                         net = stcb->asoc.alternate;
12403                 } else {
12404                         net = stcb->asoc.primary_destination;
12405                 }
12406         }
12407         atomic_add_int(&stcb->total_sends, 1);
12408         /* Keep the stcb from being freed under our feet */
12409         atomic_add_int(&asoc->refcnt, 1);
12410         free_cnt_applied = 1;
12411
12412         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12413                 if (sndlen > asoc->smallest_mtu) {
12414                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12415                         error = EMSGSIZE;
12416                         goto out_unlocked;
12417                 }
12418         }
12419         if (SCTP_SO_IS_NBIO(so)
12420             || (flags & MSG_NBIO)
12421             ) {
12422                 non_blocking = 1;
12423         }
12424         /* would we block? */
12425         if (non_blocking) {
12426                 if (hold_tcblock == 0) {
12427                         SCTP_TCB_LOCK(stcb);
12428                         hold_tcblock = 1;
12429                 }
12430                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12431                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12432                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12433                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12434                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12435                                 error = EMSGSIZE;
12436                         else
12437                                 error = EWOULDBLOCK;
12438                         goto out_unlocked;
12439                 }
12440                 stcb->asoc.sb_send_resv += sndlen;
12441                 SCTP_TCB_UNLOCK(stcb);
12442                 hold_tcblock = 0;
12443         } else {
12444                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12445         }
12446         local_soresv = sndlen;
12447         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12448                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12449                 error = ECONNRESET;
12450                 goto out_unlocked;
12451         }
12452         if (create_lock_applied) {
12453                 SCTP_ASOC_CREATE_UNLOCK(inp);
12454                 create_lock_applied = 0;
12455         }
12456         if (asoc->stream_reset_outstanding) {
12457                 /*
12458                  * Can't queue any data while stream reset is underway.
12459                  */
12460                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12461                 error = EAGAIN;
12462                 goto out_unlocked;
12463         }
12464         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12465             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12466                 queue_only = 1;
12467         }
12468         /* we are now done with all control */
12469         if (control) {
12470                 sctp_m_freem(control);
12471                 control = NULL;
12472         }
12473         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12474             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12475             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12476             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12477                 if (srcv->sinfo_flags & SCTP_ABORT) {
12478                         ;
12479                 } else {
12480                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12481                         error = ECONNRESET;
12482                         goto out_unlocked;
12483                 }
12484         }
12485         /* Ok, we will attempt a msgsnd :> */
12486         if (p) {
12487                 p->td_ru.ru_msgsnd++;
12488         }
12489         /* Are we aborting? */
12490         if (srcv->sinfo_flags & SCTP_ABORT) {
12491                 struct mbuf *mm;
12492                 int tot_demand, tot_out = 0, max_out;
12493
12494                 SCTP_STAT_INCR(sctps_sends_with_abort);
12495                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12496                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12497                         /* It has to be up before we abort */
12498                         /* how big is the user initiated abort? */
12499                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12500                         error = EINVAL;
12501                         goto out;
12502                 }
12503                 if (hold_tcblock) {
12504                         SCTP_TCB_UNLOCK(stcb);
12505                         hold_tcblock = 0;
12506                 }
12507                 if (top) {
12508                         struct mbuf *cntm = NULL;
12509
12510                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12511                         if (sndlen != 0) {
12512                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12513                                         tot_out += SCTP_BUF_LEN(cntm);
12514                                 }
12515                         }
12516                 } else {
12517                         /* Must fit in a MTU */
12518                         tot_out = sndlen;
12519                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12520                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12521                                 /* To big */
12522                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12523                                 error = EMSGSIZE;
12524                                 goto out;
12525                         }
12526                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12527                 }
12528                 if (mm == NULL) {
12529                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12530                         error = ENOMEM;
12531                         goto out;
12532                 }
12533                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12534                 max_out -= sizeof(struct sctp_abort_msg);
12535                 if (tot_out > max_out) {
12536                         tot_out = max_out;
12537                 }
12538                 if (mm) {
12539                         struct sctp_paramhdr *ph;
12540
12541                         /* now move forward the data pointer */
12542                         ph = mtod(mm, struct sctp_paramhdr *);
12543                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12544                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12545                         ph++;
12546                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12547                         if (top == NULL) {
12548                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12549                                 if (error) {
12550                                         /*-
12551                                          * Here if we can't get his data we
12552                                          * still abort we just don't get to
12553                                          * send the users note :-0
12554                                          */
12555                                         sctp_m_freem(mm);
12556                                         mm = NULL;
12557                                 }
12558                         } else {
12559                                 if (sndlen != 0) {
12560                                         SCTP_BUF_NEXT(mm) = top;
12561                                 }
12562                         }
12563                 }
12564                 if (hold_tcblock == 0) {
12565                         SCTP_TCB_LOCK(stcb);
12566                 }
12567                 atomic_add_int(&stcb->asoc.refcnt, -1);
12568                 free_cnt_applied = 0;
12569                 /* release this lock, otherwise we hang on ourselves */
12570                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12571                 /* now relock the stcb so everything is sane */
12572                 hold_tcblock = 0;
12573                 stcb = NULL;
12574                 /*
12575                  * In this case top is already chained to mm avoid double
12576                  * free, since we free it below if top != NULL and driver
12577                  * would free it after sending the packet out
12578                  */
12579                 if (sndlen != 0) {
12580                         top = NULL;
12581                 }
12582                 goto out_unlocked;
12583         }
12584         /* Calculate the maximum we can send */
12585         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12586         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12587                 if (non_blocking) {
12588                         /* we already checked for non-blocking above. */
12589                         max_len = sndlen;
12590                 } else {
12591                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12592                 }
12593         } else {
12594                 max_len = 0;
12595         }
12596         if (hold_tcblock) {
12597                 SCTP_TCB_UNLOCK(stcb);
12598                 hold_tcblock = 0;
12599         }
12600         /* Is the stream no. valid? */
12601         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12602                 /* Invalid stream number */
12603                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12604                 error = EINVAL;
12605                 goto out_unlocked;
12606         }
12607         if (asoc->strmout == NULL) {
12608                 /* huh? software error */
12609                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12610                 error = EFAULT;
12611                 goto out_unlocked;
12612         }
12613         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12614         if ((user_marks_eor == 0) &&
12615             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12616                 /* It will NEVER fit */
12617                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12618                 error = EMSGSIZE;
12619                 goto out_unlocked;
12620         }
12621         if ((uio == NULL) && user_marks_eor) {
12622                 /*-
12623                  * We do not support eeor mode for
12624                  * sending with mbuf chains (like sendfile).
12625                  */
12626                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12627                 error = EINVAL;
12628                 goto out_unlocked;
12629         }
12630         if (user_marks_eor) {
12631                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12632         } else {
12633                 /*-
12634                  * For non-eeor the whole message must fit in
12635                  * the socket send buffer.
12636                  */
12637                 local_add_more = sndlen;
12638         }
12639         len = 0;
12640         if (non_blocking) {
12641                 goto skip_preblock;
12642         }
12643         if (((max_len <= local_add_more) &&
12644             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12645             (max_len == 0) ||
12646             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12647                 /* No room right now ! */
12648                 SOCKBUF_LOCK(&so->so_snd);
12649                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12650                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12651                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12652                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12653                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12654                             inqueue_bytes,
12655                             local_add_more,
12656                             stcb->asoc.stream_queue_cnt,
12657                             stcb->asoc.chunks_on_out_queue,
12658                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12659                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12660                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12661                         }
12662                         be.error = 0;
12663                         stcb->block_entry = &be;
12664                         error = sbwait(&so->so_snd);
12665                         stcb->block_entry = NULL;
12666                         if (error || so->so_error || be.error) {
12667                                 if (error == 0) {
12668                                         if (so->so_error)
12669                                                 error = so->so_error;
12670                                         if (be.error) {
12671                                                 error = be.error;
12672                                         }
12673                                 }
12674                                 SOCKBUF_UNLOCK(&so->so_snd);
12675                                 goto out_unlocked;
12676                         }
12677                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12678                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12679                                     asoc, stcb->asoc.total_output_queue_size);
12680                         }
12681                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12682                                 goto out_unlocked;
12683                         }
12684                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12685                 }
12686                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12687                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12688                 } else {
12689                         max_len = 0;
12690                 }
12691                 SOCKBUF_UNLOCK(&so->so_snd);
12692         }
12693 skip_preblock:
12694         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12695                 goto out_unlocked;
12696         }
12697         /*
12698          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12699          * case NOTE: uio will be null when top/mbuf is passed
12700          */
12701         if (sndlen == 0) {
12702                 if (srcv->sinfo_flags & SCTP_EOF) {
12703                         got_all_of_the_send = 1;
12704                         goto dataless_eof;
12705                 } else {
12706                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12707                         error = EINVAL;
12708                         goto out;
12709                 }
12710         }
12711         if (top == NULL) {
12712                 struct sctp_stream_queue_pending *sp;
12713                 struct sctp_stream_out *strm;
12714                 uint32_t sndout;
12715
12716                 SCTP_TCB_SEND_LOCK(stcb);
12717                 if ((asoc->stream_locked) &&
12718                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12719                         SCTP_TCB_SEND_UNLOCK(stcb);
12720                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12721                         error = EINVAL;
12722                         goto out;
12723                 }
12724                 SCTP_TCB_SEND_UNLOCK(stcb);
12725
12726                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12727                 if (strm->last_msg_incomplete == 0) {
12728         do_a_copy_in:
12729                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12730                         if ((sp == NULL) || (error)) {
12731                                 goto out;
12732                         }
12733                         SCTP_TCB_SEND_LOCK(stcb);
12734                         if (sp->msg_is_complete) {
12735                                 strm->last_msg_incomplete = 0;
12736                                 asoc->stream_locked = 0;
12737                         } else {
12738                                 /*
12739                                  * Just got locked to this guy in case of an
12740                                  * interrupt.
12741                                  */
12742                                 strm->last_msg_incomplete = 1;
12743                                 asoc->stream_locked = 1;
12744                                 asoc->stream_locked_on = srcv->sinfo_stream;
12745                                 sp->sender_all_done = 0;
12746                         }
12747                         sctp_snd_sb_alloc(stcb, sp->length);
12748                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12749                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12750                                 sp->strseq = strm->next_sequence_sent;
12751                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12752                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12753                                             (uintptr_t) stcb, sp->length,
12754                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12755                                 }
12756                                 strm->next_sequence_sent++;
12757                         } else {
12758                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12759                         }
12760                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12761                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12762                         SCTP_TCB_SEND_UNLOCK(stcb);
12763                 } else {
12764                         SCTP_TCB_SEND_LOCK(stcb);
12765                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12766                         SCTP_TCB_SEND_UNLOCK(stcb);
12767                         if (sp == NULL) {
12768                                 /* ???? Huh ??? last msg is gone */
12769 #ifdef INVARIANTS
12770                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12771 #else
12772                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12773                                 strm->last_msg_incomplete = 0;
12774 #endif
12775                                 goto do_a_copy_in;
12776
12777                         }
12778                 }
12779                 while (uio->uio_resid > 0) {
12780                         /* How much room do we have? */
12781                         struct mbuf *new_tail, *mm;
12782
12783                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12784                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12785                         else
12786                                 max_len = 0;
12787
12788                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12789                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12790                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12791                                 sndout = 0;
12792                                 new_tail = NULL;
12793                                 if (hold_tcblock) {
12794                                         SCTP_TCB_UNLOCK(stcb);
12795                                         hold_tcblock = 0;
12796                                 }
12797                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12798                                 if ((mm == NULL) || error) {
12799                                         if (mm) {
12800                                                 sctp_m_freem(mm);
12801                                         }
12802                                         goto out;
12803                                 }
12804                                 /* Update the mbuf and count */
12805                                 SCTP_TCB_SEND_LOCK(stcb);
12806                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12807                                         /*
12808                                          * we need to get out. Peer probably
12809                                          * aborted.
12810                                          */
12811                                         sctp_m_freem(mm);
12812                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12813                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12814                                                 error = ECONNRESET;
12815                                         }
12816                                         SCTP_TCB_SEND_UNLOCK(stcb);
12817                                         goto out;
12818                                 }
12819                                 if (sp->tail_mbuf) {
12820                                         /* tack it to the end */
12821                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12822                                         sp->tail_mbuf = new_tail;
12823                                 } else {
12824                                         /* A stolen mbuf */
12825                                         sp->data = mm;
12826                                         sp->tail_mbuf = new_tail;
12827                                 }
12828                                 sctp_snd_sb_alloc(stcb, sndout);
12829                                 atomic_add_int(&sp->length, sndout);
12830                                 len += sndout;
12831
12832                                 /* Did we reach EOR? */
12833                                 if ((uio->uio_resid == 0) &&
12834                                     ((user_marks_eor == 0) ||
12835                                     (srcv->sinfo_flags & SCTP_EOF) ||
12836                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12837                                         sp->msg_is_complete = 1;
12838                                 } else {
12839                                         sp->msg_is_complete = 0;
12840                                 }
12841                                 SCTP_TCB_SEND_UNLOCK(stcb);
12842                         }
12843                         if (uio->uio_resid == 0) {
12844                                 /* got it all? */
12845                                 continue;
12846                         }
12847                         /* PR-SCTP? */
12848                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12849                                 /*
12850                                  * This is ugly but we must assure locking
12851                                  * order
12852                                  */
12853                                 if (hold_tcblock == 0) {
12854                                         SCTP_TCB_LOCK(stcb);
12855                                         hold_tcblock = 1;
12856                                 }
12857                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12858                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12859                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12860                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12861                                 else
12862                                         max_len = 0;
12863                                 if (max_len > 0) {
12864                                         continue;
12865                                 }
12866                                 SCTP_TCB_UNLOCK(stcb);
12867                                 hold_tcblock = 0;
12868                         }
12869                         /* wait for space now */
12870                         if (non_blocking) {
12871                                 /* Non-blocking io in place out */
12872                                 goto skip_out_eof;
12873                         }
12874                         /* What about the INIT, send it maybe */
12875                         if (queue_only_for_init) {
12876                                 if (hold_tcblock == 0) {
12877                                         SCTP_TCB_LOCK(stcb);
12878                                         hold_tcblock = 1;
12879                                 }
12880                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12881                                         /* a collision took us forward? */
12882                                         queue_only = 0;
12883                                 } else {
12884                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12885                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12886                                         queue_only = 1;
12887                                 }
12888                         }
12889                         if ((net->flight_size > net->cwnd) &&
12890                             (asoc->sctp_cmt_on_off == 0)) {
12891                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12892                                 queue_only = 1;
12893                         } else if (asoc->ifp_had_enobuf) {
12894                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12895                                 if (net->flight_size > (2 * net->mtu)) {
12896                                         queue_only = 1;
12897                                 }
12898                                 asoc->ifp_had_enobuf = 0;
12899                         }
12900                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12901                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12902                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12903                             (stcb->asoc.total_flight > 0) &&
12904                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12905                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12906
12907                                 /*-
12908                                  * Ok, Nagle is set on and we have data outstanding.
12909                                  * Don't send anything and let SACKs drive out the
12910                                  * data unless wen have a "full" segment to send.
12911                                  */
12912                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12913                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12914                                 }
12915                                 SCTP_STAT_INCR(sctps_naglequeued);
12916                                 nagle_applies = 1;
12917                         } else {
12918                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12919                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12920                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12921                                 }
12922                                 SCTP_STAT_INCR(sctps_naglesent);
12923                                 nagle_applies = 0;
12924                         }
12925                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12926
12927                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12928                                     nagle_applies, un_sent);
12929                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12930                                     stcb->asoc.total_flight,
12931                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
12932                         }
12933                         if (queue_only_for_init)
12934                                 queue_only_for_init = 0;
12935                         if ((queue_only == 0) && (nagle_applies == 0)) {
12936                                 /*-
12937                                  * need to start chunk output
12938                                  * before blocking.. note that if
12939                                  * a lock is already applied, then
12940                                  * the input via the net is happening
12941                                  * and I don't need to start output :-D
12942                                  */
12943                                 if (hold_tcblock == 0) {
12944                                         if (SCTP_TCB_TRYLOCK(stcb)) {
12945                                                 hold_tcblock = 1;
12946                                                 sctp_chunk_output(inp,
12947                                                     stcb,
12948                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12949                                         }
12950                                 } else {
12951                                         sctp_chunk_output(inp,
12952                                             stcb,
12953                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12954                                 }
12955                                 if (hold_tcblock == 1) {
12956                                         SCTP_TCB_UNLOCK(stcb);
12957                                         hold_tcblock = 0;
12958                                 }
12959                         }
12960                         SOCKBUF_LOCK(&so->so_snd);
12961                         /*-
12962                          * This is a bit strange, but I think it will
12963                          * work. The total_output_queue_size is locked and
12964                          * protected by the TCB_LOCK, which we just released.
12965                          * There is a race that can occur between releasing it
12966                          * above, and me getting the socket lock, where sacks
12967                          * come in but we have not put the SB_WAIT on the
12968                          * so_snd buffer to get the wakeup. After the LOCK
12969                          * is applied the sack_processing will also need to
12970                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12971                          * once we have the socket buffer lock if we recheck the
12972                          * size we KNOW we will get to sleep safely with the
12973                          * wakeup flag in place.
12974                          */
12975                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12976                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
12977                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12978                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12979                                             asoc, uio->uio_resid);
12980                                 }
12981                                 be.error = 0;
12982                                 stcb->block_entry = &be;
12983                                 error = sbwait(&so->so_snd);
12984                                 stcb->block_entry = NULL;
12985
12986                                 if (error || so->so_error || be.error) {
12987                                         if (error == 0) {
12988                                                 if (so->so_error)
12989                                                         error = so->so_error;
12990                                                 if (be.error) {
12991                                                         error = be.error;
12992                                                 }
12993                                         }
12994                                         SOCKBUF_UNLOCK(&so->so_snd);
12995                                         goto out_unlocked;
12996                                 }
12997                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12998                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12999                                             asoc, stcb->asoc.total_output_queue_size);
13000                                 }
13001                         }
13002                         SOCKBUF_UNLOCK(&so->so_snd);
13003                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13004                                 goto out_unlocked;
13005                         }
13006                 }
13007                 SCTP_TCB_SEND_LOCK(stcb);
13008                 if (sp) {
13009                         if (sp->msg_is_complete == 0) {
13010                                 strm->last_msg_incomplete = 1;
13011                                 asoc->stream_locked = 1;
13012                                 asoc->stream_locked_on = srcv->sinfo_stream;
13013                         } else {
13014                                 sp->sender_all_done = 1;
13015                                 strm->last_msg_incomplete = 0;
13016                                 asoc->stream_locked = 0;
13017                         }
13018                 } else {
13019                         SCTP_PRINTF("Huh no sp TSNH?\n");
13020                         strm->last_msg_incomplete = 0;
13021                         asoc->stream_locked = 0;
13022                 }
13023                 SCTP_TCB_SEND_UNLOCK(stcb);
13024                 if (uio->uio_resid == 0) {
13025                         got_all_of_the_send = 1;
13026                 }
13027         } else {
13028                 /* We send in a 0, since we do NOT have any locks */
13029                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13030                 top = NULL;
13031                 if (srcv->sinfo_flags & SCTP_EOF) {
13032                         /*
13033                          * This should only happen for Panda for the mbuf
13034                          * send case, which does NOT yet support EEOR mode.
13035                          * Thus, we can just set this flag to do the proper
13036                          * EOF handling.
13037                          */
13038                         got_all_of_the_send = 1;
13039                 }
13040         }
13041         if (error) {
13042                 goto out;
13043         }
13044 dataless_eof:
13045         /* EOF thing ? */
13046         if ((srcv->sinfo_flags & SCTP_EOF) &&
13047             (got_all_of_the_send == 1)) {
13048                 int cnt;
13049
13050                 SCTP_STAT_INCR(sctps_sends_with_eof);
13051                 error = 0;
13052                 if (hold_tcblock == 0) {
13053                         SCTP_TCB_LOCK(stcb);
13054                         hold_tcblock = 1;
13055                 }
13056                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13057                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13058                     TAILQ_EMPTY(&asoc->sent_queue) &&
13059                     (cnt == 0)) {
13060                         if (asoc->locked_on_sending) {
13061                                 goto abort_anyway;
13062                         }
13063                         /* there is nothing queued to send, so I'm done... */
13064                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13065                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13066                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13067                                 struct sctp_nets *netp;
13068
13069                                 if (stcb->asoc.alternate) {
13070                                         netp = stcb->asoc.alternate;
13071                                 } else {
13072                                         netp = stcb->asoc.primary_destination;
13073                                 }
13074                                 /* only send SHUTDOWN the first time through */
13075                                 sctp_send_shutdown(stcb, netp);
13076                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13077                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13078                                 }
13079                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13080                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13081                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13082                                     netp);
13083                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13084                                     asoc->primary_destination);
13085                         }
13086                 } else {
13087                         /*-
13088                          * we still got (or just got) data to send, so set
13089                          * SHUTDOWN_PENDING
13090                          */
13091                         /*-
13092                          * XXX sockets draft says that SCTP_EOF should be
13093                          * sent with no data.  currently, we will allow user
13094                          * data to be sent first and move to
13095                          * SHUTDOWN-PENDING
13096                          */
13097                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13098                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13099                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13100                                 if (hold_tcblock == 0) {
13101                                         SCTP_TCB_LOCK(stcb);
13102                                         hold_tcblock = 1;
13103                                 }
13104                                 if (asoc->locked_on_sending) {
13105                                         /* Locked to send out the data */
13106                                         struct sctp_stream_queue_pending *sp;
13107
13108                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13109                                         if (sp) {
13110                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13111                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13112                                         }
13113                                 }
13114                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13115                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13116                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13117                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13118                         abort_anyway:
13119                                         if (free_cnt_applied) {
13120                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13121                                                 free_cnt_applied = 0;
13122                                         }
13123                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13124                                             NULL, SCTP_SO_LOCKED);
13125                                         /*
13126                                          * now relock the stcb so everything
13127                                          * is sane
13128                                          */
13129                                         hold_tcblock = 0;
13130                                         stcb = NULL;
13131                                         goto out;
13132                                 }
13133                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13134                                     asoc->primary_destination);
13135                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13136                         }
13137                 }
13138         }
13139 skip_out_eof:
13140         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13141                 some_on_control = 1;
13142         }
13143         if (queue_only_for_init) {
13144                 if (hold_tcblock == 0) {
13145                         SCTP_TCB_LOCK(stcb);
13146                         hold_tcblock = 1;
13147                 }
13148                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13149                         /* a collision took us forward? */
13150                         queue_only = 0;
13151                 } else {
13152                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13153                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13154                         queue_only = 1;
13155                 }
13156         }
13157         if ((net->flight_size > net->cwnd) &&
13158             (stcb->asoc.sctp_cmt_on_off == 0)) {
13159                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13160                 queue_only = 1;
13161         } else if (asoc->ifp_had_enobuf) {
13162                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13163                 if (net->flight_size > (2 * net->mtu)) {
13164                         queue_only = 1;
13165                 }
13166                 asoc->ifp_had_enobuf = 0;
13167         }
13168         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13169             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13170         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13171             (stcb->asoc.total_flight > 0) &&
13172             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13173             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13174                 /*-
13175                  * Ok, Nagle is set on and we have data outstanding.
13176                  * Don't send anything and let SACKs drive out the
13177                  * data unless wen have a "full" segment to send.
13178                  */
13179                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13180                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13181                 }
13182                 SCTP_STAT_INCR(sctps_naglequeued);
13183                 nagle_applies = 1;
13184         } else {
13185                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13186                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13187                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13188                 }
13189                 SCTP_STAT_INCR(sctps_naglesent);
13190                 nagle_applies = 0;
13191         }
13192         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13193                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13194                     nagle_applies, un_sent);
13195                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13196                     stcb->asoc.total_flight,
13197                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13198         }
13199         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13200                 /* we can attempt to send too. */
13201                 if (hold_tcblock == 0) {
13202                         /*
13203                          * If there is activity recv'ing sacks no need to
13204                          * send
13205                          */
13206                         if (SCTP_TCB_TRYLOCK(stcb)) {
13207                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13208                                 hold_tcblock = 1;
13209                         }
13210                 } else {
13211                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13212                 }
13213         } else if ((queue_only == 0) &&
13214                     (stcb->asoc.peers_rwnd == 0) &&
13215             (stcb->asoc.total_flight == 0)) {
13216                 /* We get to have a probe outstanding */
13217                 if (hold_tcblock == 0) {
13218                         hold_tcblock = 1;
13219                         SCTP_TCB_LOCK(stcb);
13220                 }
13221                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13222         } else if (some_on_control) {
13223                 int num_out, reason, frag_point;
13224
13225                 /* Here we do control only */
13226                 if (hold_tcblock == 0) {
13227                         hold_tcblock = 1;
13228                         SCTP_TCB_LOCK(stcb);
13229                 }
13230                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13231                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13232                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13233         }
13234         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13235             queue_only, stcb->asoc.peers_rwnd, un_sent,
13236             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13237             stcb->asoc.total_output_queue_size, error);
13238
13239 out:
13240 out_unlocked:
13241
13242         if (local_soresv && stcb) {
13243                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13244         }
13245         if (create_lock_applied) {
13246                 SCTP_ASOC_CREATE_UNLOCK(inp);
13247         }
13248         if ((stcb) && hold_tcblock) {
13249                 SCTP_TCB_UNLOCK(stcb);
13250         }
13251         if (stcb && free_cnt_applied) {
13252                 atomic_add_int(&stcb->asoc.refcnt, -1);
13253         }
13254 #ifdef INVARIANTS
13255         if (stcb) {
13256                 if (mtx_owned(&stcb->tcb_mtx)) {
13257                         panic("Leaving with tcb mtx owned?");
13258                 }
13259                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13260                         panic("Leaving with tcb send mtx owned?");
13261                 }
13262         }
13263 #endif
13264 #ifdef INVARIANTS
13265         if (inp) {
13266                 sctp_validate_no_locks(inp);
13267         } else {
13268                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13269         }
13270 #endif
13271         if (top) {
13272                 sctp_m_freem(top);
13273         }
13274         if (control) {
13275                 sctp_m_freem(control);
13276         }
13277         return (error);
13278 }
13279
13280
13281 /*
13282  * generate an AUTHentication chunk, if required
13283  */
13284 struct mbuf *
13285 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13286     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13287     struct sctp_tcb *stcb, uint8_t chunk)
13288 {
13289         struct mbuf *m_auth;
13290         struct sctp_auth_chunk *auth;
13291         int chunk_len;
13292         struct mbuf *cn;
13293
13294         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13295             (stcb == NULL))
13296                 return (m);
13297
13298         /* sysctl disabled auth? */
13299         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13300                 return (m);
13301
13302         /* peer doesn't do auth... */
13303         if (!stcb->asoc.peer_supports_auth) {
13304                 return (m);
13305         }
13306         /* does the requested chunk require auth? */
13307         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13308                 return (m);
13309         }
13310         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13311         if (m_auth == NULL) {
13312                 /* no mbuf's */
13313                 return (m);
13314         }
13315         /* reserve some space if this will be the first mbuf */
13316         if (m == NULL)
13317                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13318         /* fill in the AUTH chunk details */
13319         auth = mtod(m_auth, struct sctp_auth_chunk *);
13320         bzero(auth, sizeof(*auth));
13321         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13322         auth->ch.chunk_flags = 0;
13323         chunk_len = sizeof(*auth) +
13324             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13325         auth->ch.chunk_length = htons(chunk_len);
13326         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13327         /* key id and hmac digest will be computed and filled in upon send */
13328
13329         /* save the offset where the auth was inserted into the chain */
13330         *offset = 0;
13331         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13332                 *offset += SCTP_BUF_LEN(cn);
13333         }
13334
13335         /* update length and return pointer to the auth chunk */
13336         SCTP_BUF_LEN(m_auth) = chunk_len;
13337         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13338         if (auth_ret != NULL)
13339                 *auth_ret = auth;
13340
13341         return (m);
13342 }
13343
13344 #ifdef INET6
13345 int
13346 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13347 {
13348         struct nd_prefix *pfx = NULL;
13349         struct nd_pfxrouter *pfxrtr = NULL;
13350         struct sockaddr_in6 gw6;
13351
13352         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13353                 return (0);
13354
13355         /* get prefix entry of address */
13356         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13357                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13358                         continue;
13359                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13360                     &src6->sin6_addr, &pfx->ndpr_mask))
13361                         break;
13362         }
13363         /* no prefix entry in the prefix list */
13364         if (pfx == NULL) {
13365                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13366                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13367                 return (0);
13368         }
13369         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13370         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13371
13372         /* search installed gateway from prefix entry */
13373         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13374                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13375                 gw6.sin6_family = AF_INET6;
13376                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13377                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13378                     sizeof(struct in6_addr));
13379                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13380                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13381                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13382                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13383                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13384                     ro->ro_rt->rt_gateway)) {
13385                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13386                         return (1);
13387                 }
13388         }
13389         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13390         return (0);
13391 }
13392
13393 #endif
13394
13395 int
13396 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13397 {
13398 #ifdef INET
13399         struct sockaddr_in *sin, *mask;
13400         struct ifaddr *ifa;
13401         struct in_addr srcnetaddr, gwnetaddr;
13402
13403         if (ro == NULL || ro->ro_rt == NULL ||
13404             sifa->address.sa.sa_family != AF_INET) {
13405                 return (0);
13406         }
13407         ifa = (struct ifaddr *)sifa->ifa;
13408         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13409         sin = (struct sockaddr_in *)&sifa->address.sin;
13410         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13411         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13412         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13413         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13414
13415         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13416         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13417         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13418         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13419         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13420         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13421                 return (1);
13422         }
13423 #endif
13424         return (0);
13425 }