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                                 RO_RTFREE(ro);
4167                         } else {
4168                                 /*
4169                                  * PMTU check versus smallest asoc MTU goes
4170                                  * here
4171                                  */
4172                                 if ((ro->ro_rt != NULL) &&
4173                                     (net->ro._s_addr)) {
4174                                         uint32_t mtu;
4175
4176                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4177                                         if (net->port) {
4178                                                 mtu -= sizeof(struct udphdr);
4179                                         }
4180                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4181                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4182                                                 net->mtu = mtu;
4183                                         }
4184                                 } else if (ro->ro_rt == NULL) {
4185                                         /* route was freed */
4186                                         if (net->ro._s_addr &&
4187                                             net->src_addr_selected) {
4188                                                 sctp_free_ifa(net->ro._s_addr);
4189                                                 net->ro._s_addr = NULL;
4190                                         }
4191                                         net->src_addr_selected = 0;
4192                                 }
4193                         }
4194                         return (ret);
4195                 }
4196 #endif
4197 #ifdef INET6
4198         case AF_INET6:
4199                 {
4200                         uint32_t flowlabel, flowinfo;
4201                         struct ip6_hdr *ip6h;
4202                         struct route_in6 ip6route;
4203                         struct ifnet *ifp;
4204                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4205                         int prev_scope = 0;
4206                         struct sockaddr_in6 lsa6_storage;
4207                         int error;
4208                         u_short prev_port = 0;
4209                         int len;
4210
4211                         if (net) {
4212                                 flowlabel = net->flowlabel;
4213                         } else if (stcb) {
4214                                 flowlabel = stcb->asoc.default_flowlabel;
4215                         } else {
4216                                 flowlabel = inp->sctp_ep.default_flowlabel;
4217                         }
4218                         if (flowlabel == 0) {
4219                                 /*
4220                                  * This means especially, that it is not set
4221                                  * at the SCTP layer. So use the value from
4222                                  * the IP layer.
4223                                  */
4224                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4225                         }
4226                         flowlabel &= 0x000fffff;
4227                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4228                         if (port) {
4229                                 len += sizeof(struct udphdr);
4230                         }
4231                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4232                         if (newm == NULL) {
4233                                 sctp_m_freem(m);
4234                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4235                                 return (ENOMEM);
4236                         }
4237                         SCTP_ALIGN_TO_END(newm, len);
4238                         SCTP_BUF_LEN(newm) = len;
4239                         SCTP_BUF_NEXT(newm) = m;
4240                         m = newm;
4241                         if (net != NULL) {
4242 #ifdef INVARIANTS
4243                                 if (net->flowidset == 0) {
4244                                         panic("Flow ID not set");
4245                                 }
4246 #endif
4247                                 m->m_pkthdr.flowid = net->flowid;
4248                                 m->m_flags |= M_FLOWID;
4249                         } else {
4250                                 if (use_mflowid != 0) {
4251                                         m->m_pkthdr.flowid = mflowid;
4252                                         m->m_flags |= M_FLOWID;
4253                                 }
4254                         }
4255                         packet_length = sctp_calculate_len(m);
4256
4257                         ip6h = mtod(m, struct ip6_hdr *);
4258                         /* protect *sin6 from overwrite */
4259                         sin6 = (struct sockaddr_in6 *)to;
4260                         tmp = *sin6;
4261                         sin6 = &tmp;
4262
4263                         /* KAME hack: embed scopeid */
4264                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4265                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4266                                 return (EINVAL);
4267                         }
4268                         if (net == NULL) {
4269                                 memset(&ip6route, 0, sizeof(ip6route));
4270                                 ro = (sctp_route_t *) & ip6route;
4271                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4272                         } else {
4273                                 ro = (sctp_route_t *) & net->ro;
4274                         }
4275                         /*
4276                          * We assume here that inp_flow is in host byte
4277                          * order within the TCB!
4278                          */
4279                         if (tos_value == 0) {
4280                                 /*
4281                                  * This means especially, that it is not set
4282                                  * at the SCTP layer. So use the value from
4283                                  * the IP layer.
4284                                  */
4285                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4286                         }
4287                         tos_value &= 0xfc;
4288                         if (ecn_ok) {
4289                                 tos_value |= sctp_get_ect(stcb);
4290                         }
4291                         flowinfo = 0x06;
4292                         flowinfo <<= 8;
4293                         flowinfo |= tos_value;
4294                         flowinfo <<= 20;
4295                         flowinfo |= flowlabel;
4296                         ip6h->ip6_flow = htonl(flowinfo);
4297                         if (port) {
4298                                 ip6h->ip6_nxt = IPPROTO_UDP;
4299                         } else {
4300                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4301                         }
4302                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4303                         ip6h->ip6_dst = sin6->sin6_addr;
4304
4305                         /*
4306                          * Add SRC address selection here: we can only reuse
4307                          * to a limited degree the kame src-addr-sel, since
4308                          * we can try their selection but it may not be
4309                          * bound.
4310                          */
4311                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4312                         lsa6_tmp.sin6_family = AF_INET6;
4313                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4314                         lsa6 = &lsa6_tmp;
4315                         if (net && out_of_asoc_ok == 0) {
4316                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4317                                         sctp_free_ifa(net->ro._s_addr);
4318                                         net->ro._s_addr = NULL;
4319                                         net->src_addr_selected = 0;
4320                                         if (ro->ro_rt) {
4321                                                 RTFREE(ro->ro_rt);
4322                                                 ro->ro_rt = NULL;
4323                                         }
4324                                 }
4325                                 if (net->src_addr_selected == 0) {
4326                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4327                                         /* KAME hack: embed scopeid */
4328                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4329                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4330                                                 return (EINVAL);
4331                                         }
4332                                         /* Cache the source address */
4333                                         net->ro._s_addr = sctp_source_address_selection(inp,
4334                                             stcb,
4335                                             ro,
4336                                             net,
4337                                             0,
4338                                             vrf_id);
4339                                         (void)sa6_recoverscope(sin6);
4340                                         net->src_addr_selected = 1;
4341                                 }
4342                                 if (net->ro._s_addr == NULL) {
4343                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4344                                         net->src_addr_selected = 0;
4345                                         sctp_handle_no_route(stcb, net, so_locked);
4346                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4347                                         sctp_m_freem(m);
4348                                         return (EHOSTUNREACH);
4349                                 }
4350                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4351                         } else {
4352                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4353                                 /* KAME hack: embed scopeid */
4354                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4355                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4356                                         return (EINVAL);
4357                                 }
4358                                 if (over_addr == NULL) {
4359                                         struct sctp_ifa *_lsrc;
4360
4361                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4362                                             net,
4363                                             out_of_asoc_ok,
4364                                             vrf_id);
4365                                         if (_lsrc == NULL) {
4366                                                 sctp_handle_no_route(stcb, net, so_locked);
4367                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4368                                                 sctp_m_freem(m);
4369                                                 return (EHOSTUNREACH);
4370                                         }
4371                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4372                                         sctp_free_ifa(_lsrc);
4373                                 } else {
4374                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4375                                         SCTP_RTALLOC(ro, vrf_id);
4376                                 }
4377                                 (void)sa6_recoverscope(sin6);
4378                         }
4379                         lsa6->sin6_port = inp->sctp_lport;
4380
4381                         if (ro->ro_rt == NULL) {
4382                                 /*
4383                                  * src addr selection failed to find a route
4384                                  * (or valid source addr), so we can't get
4385                                  * there from here!
4386                                  */
4387                                 sctp_handle_no_route(stcb, net, so_locked);
4388                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4389                                 sctp_m_freem(m);
4390                                 return (EHOSTUNREACH);
4391                         }
4392                         /*
4393                          * XXX: sa6 may not have a valid sin6_scope_id in
4394                          * the non-SCOPEDROUTING case.
4395                          */
4396                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4397                         lsa6_storage.sin6_family = AF_INET6;
4398                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4399                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4400                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4401                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4402                                 sctp_m_freem(m);
4403                                 return (error);
4404                         }
4405                         /* XXX */
4406                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4407                         lsa6_storage.sin6_port = inp->sctp_lport;
4408                         lsa6 = &lsa6_storage;
4409                         ip6h->ip6_src = lsa6->sin6_addr;
4410
4411                         if (port) {
4412                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4413                                         sctp_handle_no_route(stcb, net, so_locked);
4414                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4415                                         sctp_m_freem(m);
4416                                         return (EHOSTUNREACH);
4417                                 }
4418                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4419                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4420                                 udp->uh_dport = port;
4421                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4422                                 udp->uh_sum = 0;
4423                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4424                         } else {
4425                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4426                         }
4427
4428                         sctphdr->src_port = src_port;
4429                         sctphdr->dest_port = dest_port;
4430                         sctphdr->v_tag = v_tag;
4431                         sctphdr->checksum = 0;
4432
4433                         /*
4434                          * We set the hop limit now since there is a good
4435                          * chance that our ro pointer is now filled
4436                          */
4437                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4438                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4439
4440 #ifdef SCTP_DEBUG
4441                         /* Copy to be sure something bad is not happening */
4442                         sin6->sin6_addr = ip6h->ip6_dst;
4443                         lsa6->sin6_addr = ip6h->ip6_src;
4444 #endif
4445
4446                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4447                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4448                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4449                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4450                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4451                         if (net) {
4452                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4453                                 /*
4454                                  * preserve the port and scope for link
4455                                  * local send
4456                                  */
4457                                 prev_scope = sin6->sin6_scope_id;
4458                                 prev_port = sin6->sin6_port;
4459                         }
4460                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4461                                 /* failed to prepend data, give up */
4462                                 sctp_m_freem(m);
4463                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4464                                 return (ENOMEM);
4465                         }
4466                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4467                         if (port) {
4468 #if defined(SCTP_WITH_NO_CSUM)
4469                                 SCTP_STAT_INCR(sctps_sendnocrc);
4470 #else
4471                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4472                                 SCTP_STAT_INCR(sctps_sendswcrc);
4473 #endif
4474                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4475                                         udp->uh_sum = 0xffff;
4476                                 }
4477                         } else {
4478 #if defined(SCTP_WITH_NO_CSUM)
4479                                 SCTP_STAT_INCR(sctps_sendnocrc);
4480 #else
4481                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4482                                 m->m_pkthdr.csum_data = 0;
4483                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4484 #endif
4485                         }
4486                         /* send it out. table id is taken from stcb */
4487 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4488                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4489                                 so = SCTP_INP_SO(inp);
4490                                 SCTP_SOCKET_UNLOCK(so, 0);
4491                         }
4492 #endif
4493 #ifdef SCTP_PACKET_LOGGING
4494                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4495                                 sctp_packet_log(o_pak);
4496 #endif
4497                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4498 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4499                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4500                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4501                                 SCTP_TCB_UNLOCK(stcb);
4502                                 SCTP_SOCKET_LOCK(so, 0);
4503                                 SCTP_TCB_LOCK(stcb);
4504                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4505                         }
4506 #endif
4507                         if (net) {
4508                                 /* for link local this must be done */
4509                                 sin6->sin6_scope_id = prev_scope;
4510                                 sin6->sin6_port = prev_port;
4511                         }
4512                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4513                         SCTP_STAT_INCR(sctps_sendpackets);
4514                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4515                         if (ret) {
4516                                 SCTP_STAT_INCR(sctps_senderrors);
4517                         }
4518                         if (net == NULL) {
4519                                 /* Now if we had a temp route free it */
4520                                 RO_RTFREE(ro);
4521                         } else {
4522                                 /*
4523                                  * PMTU check versus smallest asoc MTU goes
4524                                  * here
4525                                  */
4526                                 if (ro->ro_rt == NULL) {
4527                                         /* Route was freed */
4528                                         if (net->ro._s_addr &&
4529                                             net->src_addr_selected) {
4530                                                 sctp_free_ifa(net->ro._s_addr);
4531                                                 net->ro._s_addr = NULL;
4532                                         }
4533                                         net->src_addr_selected = 0;
4534                                 }
4535                                 if ((ro->ro_rt != NULL) &&
4536                                     (net->ro._s_addr)) {
4537                                         uint32_t mtu;
4538
4539                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4540                                         if (mtu &&
4541                                             (stcb->asoc.smallest_mtu > mtu)) {
4542                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4543                                                 net->mtu = mtu;
4544                                                 if (net->port) {
4545                                                         net->mtu -= sizeof(struct udphdr);
4546                                                 }
4547                                         }
4548                                 } else if (ifp) {
4549                                         if (ND_IFINFO(ifp)->linkmtu &&
4550                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4551                                                 sctp_mtu_size_reset(inp,
4552                                                     &stcb->asoc,
4553                                                     ND_IFINFO(ifp)->linkmtu);
4554                                         }
4555                                 }
4556                         }
4557                         return (ret);
4558                 }
4559 #endif
4560         default:
4561                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4562                     ((struct sockaddr *)to)->sa_family);
4563                 sctp_m_freem(m);
4564                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4565                 return (EFAULT);
4566         }
4567 }
4568
4569
4570 void
4571 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4572 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4573     SCTP_UNUSED
4574 #endif
4575 )
4576 {
4577         struct mbuf *m, *m_at, *mp_last;
4578         struct sctp_nets *net;
4579         struct sctp_init_chunk *init;
4580         struct sctp_supported_addr_param *sup_addr;
4581         struct sctp_adaptation_layer_indication *ali;
4582         struct sctp_ecn_supported_param *ecn;
4583         struct sctp_prsctp_supported_param *prsctp;
4584         struct sctp_supported_chunk_types_param *pr_supported;
4585         int cnt_inits_to = 0;
4586         int padval, ret;
4587         int num_ext;
4588         int p_len;
4589
4590         /* INIT's always go to the primary (and usually ONLY address) */
4591         mp_last = NULL;
4592         net = stcb->asoc.primary_destination;
4593         if (net == NULL) {
4594                 net = TAILQ_FIRST(&stcb->asoc.nets);
4595                 if (net == NULL) {
4596                         /* TSNH */
4597                         return;
4598                 }
4599                 /* we confirm any address we send an INIT to */
4600                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4601                 (void)sctp_set_primary_addr(stcb, NULL, net);
4602         } else {
4603                 /* we confirm any address we send an INIT to */
4604                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4605         }
4606         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4607 #ifdef INET6
4608         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4609                 /*
4610                  * special hook, if we are sending to link local it will not
4611                  * show up in our private address count.
4612                  */
4613                 struct sockaddr_in6 *sin6l;
4614
4615                 sin6l = &net->ro._l_addr.sin6;
4616                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4617                         cnt_inits_to = 1;
4618         }
4619 #endif
4620         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4621                 /* This case should not happen */
4622                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4623                 return;
4624         }
4625         /* start the INIT timer */
4626         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4627
4628         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4629         if (m == NULL) {
4630                 /* No memory, INIT timer will re-attempt. */
4631                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4632                 return;
4633         }
4634         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4635         /*
4636          * assume peer supports asconf in order to be able to queue local
4637          * address changes while an INIT is in flight and before the assoc
4638          * is established.
4639          */
4640         stcb->asoc.peer_supports_asconf = 1;
4641         /* Now lets put the SCTP header in place */
4642         init = mtod(m, struct sctp_init_chunk *);
4643         /* now the chunk header */
4644         init->ch.chunk_type = SCTP_INITIATION;
4645         init->ch.chunk_flags = 0;
4646         /* fill in later from mbuf we build */
4647         init->ch.chunk_length = 0;
4648         /* place in my tag */
4649         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4650         /* set up some of the credits. */
4651         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4652             SCTP_MINIMAL_RWND));
4653
4654         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4655         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4656         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4657         /* now the address restriction */
4658         /* XXX Should we take the address family of the socket into account? */
4659         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4660             sizeof(*init));
4661         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4662 #ifdef INET6
4663 #ifdef INET
4664         /* we support 2 types: IPv4/IPv6 */
4665         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4666         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4667         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4668 #else
4669         /* we support 1 type: IPv6 */
4670         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4671         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4672         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4673 #endif
4674 #else
4675         /* we support 1 type: IPv4 */
4676         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4677         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4678         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4679 #endif
4680         SCTP_BUF_LEN(m) += sizeof(struct sctp_supported_addr_param);
4681         /* adaptation layer indication parameter */
4682         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(struct sctp_supported_addr_param));
4683         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4684         ali->ph.param_length = htons(sizeof(*ali));
4685         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4686         SCTP_BUF_LEN(m) += sizeof(*ali);
4687         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4688
4689         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4690                 /* Add NAT friendly parameter */
4691                 struct sctp_paramhdr *ph;
4692
4693                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4694                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4695                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4696                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4697                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4698         }
4699         /* now any cookie time extensions */
4700         if (stcb->asoc.cookie_preserve_req) {
4701                 struct sctp_cookie_perserve_param *cookie_preserve;
4702
4703                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4704                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4705                 cookie_preserve->ph.param_length = htons(
4706                     sizeof(*cookie_preserve));
4707                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4708                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4709                 ecn = (struct sctp_ecn_supported_param *)(
4710                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4711                 stcb->asoc.cookie_preserve_req = 0;
4712         }
4713         /* ECN parameter */
4714         if (stcb->asoc.ecn_allowed == 1) {
4715                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4716                 ecn->ph.param_length = htons(sizeof(*ecn));
4717                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4718                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4719                     sizeof(*ecn));
4720         } else {
4721                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4722         }
4723         /* And now tell the peer we do pr-sctp */
4724         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4725         prsctp->ph.param_length = htons(sizeof(*prsctp));
4726         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4727
4728         /* And now tell the peer we do all the extensions */
4729         pr_supported = (struct sctp_supported_chunk_types_param *)
4730             ((caddr_t)prsctp + sizeof(*prsctp));
4731         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4732         num_ext = 0;
4733         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4734         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4735         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4736         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4737         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4738         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4739                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4740         }
4741         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4742                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4743         }
4744         p_len = sizeof(*pr_supported) + num_ext;
4745         pr_supported->ph.param_length = htons(p_len);
4746         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4747         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4748
4749
4750         /* add authentication parameters */
4751         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4752                 struct sctp_auth_random *randp;
4753                 struct sctp_auth_hmac_algo *hmacs;
4754                 struct sctp_auth_chunk_list *chunks;
4755
4756                 /* attach RANDOM parameter, if available */
4757                 if (stcb->asoc.authinfo.random != NULL) {
4758                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4759                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4760                         /* random key already contains the header */
4761                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4762                         /* zero out any padding required */
4763                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4764                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4765                 }
4766                 /* add HMAC_ALGO parameter */
4767                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4768                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4769                     (uint8_t *) hmacs->hmac_ids);
4770                 if (p_len > 0) {
4771                         p_len += sizeof(*hmacs);
4772                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4773                         hmacs->ph.param_length = htons(p_len);
4774                         /* zero out any padding required */
4775                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4776                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4777                 }
4778                 /* add CHUNKS parameter */
4779                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4780                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4781                     chunks->chunk_types);
4782                 if (p_len > 0) {
4783                         p_len += sizeof(*chunks);
4784                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4785                         chunks->ph.param_length = htons(p_len);
4786                         /* zero out any padding required */
4787                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4788                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4789                 }
4790         }
4791         /* now the addresses */
4792         {
4793                 struct sctp_scoping scp;
4794
4795                 /*
4796                  * To optimize this we could put the scoping stuff into a
4797                  * structure and remove the individual uint8's from the
4798                  * assoc structure. Then we could just sifa in the address
4799                  * within the stcb. But for now this is a quick hack to get
4800                  * the address stuff teased apart.
4801                  */
4802
4803                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4804                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4805                 scp.loopback_scope = stcb->asoc.loopback_scope;
4806                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4807                 scp.local_scope = stcb->asoc.local_scope;
4808                 scp.site_scope = stcb->asoc.site_scope;
4809
4810                 sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to);
4811         }
4812
4813         /* calulate the size and update pkt header and chunk header */
4814         p_len = 0;
4815         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4816                 if (SCTP_BUF_NEXT(m_at) == NULL)
4817                         mp_last = m_at;
4818                 p_len += SCTP_BUF_LEN(m_at);
4819         }
4820         init->ch.chunk_length = htons(p_len);
4821         /*
4822          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4823          * here since the timer will drive a retranmission.
4824          */
4825
4826         /* I don't expect this to execute but we will be safe here */
4827         padval = p_len % 4;
4828         if ((padval) && (mp_last)) {
4829                 /*
4830                  * The compiler worries that mp_last may not be set even
4831                  * though I think it is impossible :-> however we add
4832                  * mp_last here just in case.
4833                  */
4834                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4835                 if (ret) {
4836                         /* Houston we have a problem, no space */
4837                         sctp_m_freem(m);
4838                         return;
4839                 }
4840         }
4841         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4842         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4843             (struct sockaddr *)&net->ro._l_addr,
4844             m, 0, NULL, 0, 0, 0, 0,
4845             inp->sctp_lport, stcb->rport, htonl(0),
4846             net->port, NULL,
4847             0, 0,
4848             so_locked);
4849         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4850         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4851         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4852 }
4853
4854 struct mbuf *
4855 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4856     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4857 {
4858         /*
4859          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4860          * being equal to the beginning of the params i.e. (iphlen +
4861          * sizeof(struct sctp_init_msg) parse through the parameters to the
4862          * end of the mbuf verifying that all parameters are known.
4863          *
4864          * For unknown parameters build and return a mbuf with
4865          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4866          * processing this chunk stop, and set *abort_processing to 1.
4867          *
4868          * By having param_offset be pre-set to where parameters begin it is
4869          * hoped that this routine may be reused in the future by new
4870          * features.
4871          */
4872         struct sctp_paramhdr *phdr, params;
4873
4874         struct mbuf *mat, *op_err;
4875         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4876         int at, limit, pad_needed;
4877         uint16_t ptype, plen, padded_size;
4878         int err_at;
4879
4880         *abort_processing = 0;
4881         mat = in_initpkt;
4882         err_at = 0;
4883         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4884         at = param_offset;
4885         op_err = NULL;
4886         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4887         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4888         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4889                 ptype = ntohs(phdr->param_type);
4890                 plen = ntohs(phdr->param_length);
4891                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4892                         /* wacked parameter */
4893                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4894                         goto invalid_size;
4895                 }
4896                 limit -= SCTP_SIZE32(plen);
4897                 /*-
4898                  * All parameters for all chunks that we know/understand are
4899                  * listed here. We process them other places and make
4900                  * appropriate stop actions per the upper bits. However this
4901                  * is the generic routine processor's can call to get back
4902                  * an operr.. to either incorporate (init-ack) or send.
4903                  */
4904                 padded_size = SCTP_SIZE32(plen);
4905                 switch (ptype) {
4906                         /* Param's with variable size */
4907                 case SCTP_HEARTBEAT_INFO:
4908                 case SCTP_STATE_COOKIE:
4909                 case SCTP_UNRECOG_PARAM:
4910                 case SCTP_ERROR_CAUSE_IND:
4911                         /* ok skip fwd */
4912                         at += padded_size;
4913                         break;
4914                         /* Param's with variable size within a range */
4915                 case SCTP_CHUNK_LIST:
4916                 case SCTP_SUPPORTED_CHUNK_EXT:
4917                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4918                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4919                                 goto invalid_size;
4920                         }
4921                         at += padded_size;
4922                         break;
4923                 case SCTP_SUPPORTED_ADDRTYPE:
4924                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4925                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4926                                 goto invalid_size;
4927                         }
4928                         at += padded_size;
4929                         break;
4930                 case SCTP_RANDOM:
4931                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4932                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4933                                 goto invalid_size;
4934                         }
4935                         at += padded_size;
4936                         break;
4937                 case SCTP_SET_PRIM_ADDR:
4938                 case SCTP_DEL_IP_ADDRESS:
4939                 case SCTP_ADD_IP_ADDRESS:
4940                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4941                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4942                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4943                                 goto invalid_size;
4944                         }
4945                         at += padded_size;
4946                         break;
4947                         /* Param's with a fixed size */
4948                 case SCTP_IPV4_ADDRESS:
4949                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4950                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4951                                 goto invalid_size;
4952                         }
4953                         at += padded_size;
4954                         break;
4955                 case SCTP_IPV6_ADDRESS:
4956                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4957                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4958                                 goto invalid_size;
4959                         }
4960                         at += padded_size;
4961                         break;
4962                 case SCTP_COOKIE_PRESERVE:
4963                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4964                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4965                                 goto invalid_size;
4966                         }
4967                         at += padded_size;
4968                         break;
4969                 case SCTP_HAS_NAT_SUPPORT:
4970                         *nat_friendly = 1;
4971                         /* fall through */
4972                 case SCTP_PRSCTP_SUPPORTED:
4973
4974                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4975                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4976                                 goto invalid_size;
4977                         }
4978                         at += padded_size;
4979                         break;
4980                 case SCTP_ECN_CAPABLE:
4981                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4982                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4983                                 goto invalid_size;
4984                         }
4985                         at += padded_size;
4986                         break;
4987                 case SCTP_ULP_ADAPTATION:
4988                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4989                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4990                                 goto invalid_size;
4991                         }
4992                         at += padded_size;
4993                         break;
4994                 case SCTP_SUCCESS_REPORT:
4995                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
4996                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
4997                                 goto invalid_size;
4998                         }
4999                         at += padded_size;
5000                         break;
5001                 case SCTP_HOSTNAME_ADDRESS:
5002                         {
5003                                 /* We can NOT handle HOST NAME addresses!! */
5004                                 int l_len;
5005
5006                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5007                                 *abort_processing = 1;
5008                                 if (op_err == NULL) {
5009                                         /* Ok need to try to get a mbuf */
5010 #ifdef INET6
5011                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5012 #else
5013                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5014 #endif
5015                                         l_len += plen;
5016                                         l_len += sizeof(struct sctp_paramhdr);
5017                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5018                                         if (op_err) {
5019                                                 SCTP_BUF_LEN(op_err) = 0;
5020                                                 /*
5021                                                  * pre-reserve space for ip
5022                                                  * and sctp header  and
5023                                                  * chunk hdr
5024                                                  */
5025 #ifdef INET6
5026                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5027 #else
5028                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5029 #endif
5030                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5031                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5032                                         }
5033                                 }
5034                                 if (op_err) {
5035                                         /* If we have space */
5036                                         struct sctp_paramhdr s;
5037
5038                                         if (err_at % 4) {
5039                                                 uint32_t cpthis = 0;
5040
5041                                                 pad_needed = 4 - (err_at % 4);
5042                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5043                                                 err_at += pad_needed;
5044                                         }
5045                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5046                                         s.param_length = htons(sizeof(s) + plen);
5047                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5048                                         err_at += sizeof(s);
5049                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5050                                         if (phdr == NULL) {
5051                                                 sctp_m_freem(op_err);
5052                                                 /*
5053                                                  * we are out of memory but
5054                                                  * we still need to have a
5055                                                  * look at what to do (the
5056                                                  * system is in trouble
5057                                                  * though).
5058                                                  */
5059                                                 return (NULL);
5060                                         }
5061                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5062                                 }
5063                                 return (op_err);
5064                                 break;
5065                         }
5066                 default:
5067                         /*
5068                          * we do not recognize the parameter figure out what
5069                          * we do.
5070                          */
5071                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5072                         if ((ptype & 0x4000) == 0x4000) {
5073                                 /* Report bit is set?? */
5074                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5075                                 if (op_err == NULL) {
5076                                         int l_len;
5077
5078                                         /* Ok need to try to get an mbuf */
5079 #ifdef INET6
5080                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5081 #else
5082                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5083 #endif
5084                                         l_len += plen;
5085                                         l_len += sizeof(struct sctp_paramhdr);
5086                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5087                                         if (op_err) {
5088                                                 SCTP_BUF_LEN(op_err) = 0;
5089 #ifdef INET6
5090                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5091 #else
5092                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5093 #endif
5094                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5095                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5096                                         }
5097                                 }
5098                                 if (op_err) {
5099                                         /* If we have space */
5100                                         struct sctp_paramhdr s;
5101
5102                                         if (err_at % 4) {
5103                                                 uint32_t cpthis = 0;
5104
5105                                                 pad_needed = 4 - (err_at % 4);
5106                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5107                                                 err_at += pad_needed;
5108                                         }
5109                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5110                                         s.param_length = htons(sizeof(s) + plen);
5111                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5112                                         err_at += sizeof(s);
5113                                         if (plen > sizeof(tempbuf)) {
5114                                                 plen = sizeof(tempbuf);
5115                                         }
5116                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5117                                         if (phdr == NULL) {
5118                                                 sctp_m_freem(op_err);
5119                                                 /*
5120                                                  * we are out of memory but
5121                                                  * we still need to have a
5122                                                  * look at what to do (the
5123                                                  * system is in trouble
5124                                                  * though).
5125                                                  */
5126                                                 op_err = NULL;
5127                                                 goto more_processing;
5128                                         }
5129                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5130                                         err_at += plen;
5131                                 }
5132                         }
5133         more_processing:
5134                         if ((ptype & 0x8000) == 0x0000) {
5135                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5136                                 return (op_err);
5137                         } else {
5138                                 /* skip this chunk and continue processing */
5139                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5140                                 at += SCTP_SIZE32(plen);
5141                         }
5142                         break;
5143
5144                 }
5145                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5146         }
5147         return (op_err);
5148 invalid_size:
5149         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5150         *abort_processing = 1;
5151         if ((op_err == NULL) && phdr) {
5152                 int l_len;
5153
5154 #ifdef INET6
5155                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5156 #else
5157                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5158 #endif
5159                 l_len += (2 * sizeof(struct sctp_paramhdr));
5160                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5161                 if (op_err) {
5162                         SCTP_BUF_LEN(op_err) = 0;
5163 #ifdef INET6
5164                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5165 #else
5166                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5167 #endif
5168                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5169                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5170                 }
5171         }
5172         if ((op_err) && phdr) {
5173                 struct sctp_paramhdr s;
5174
5175                 if (err_at % 4) {
5176                         uint32_t cpthis = 0;
5177
5178                         pad_needed = 4 - (err_at % 4);
5179                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5180                         err_at += pad_needed;
5181                 }
5182                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5183                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5184                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5185                 err_at += sizeof(s);
5186                 /* Only copy back the p-hdr that caused the issue */
5187                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5188         }
5189         return (op_err);
5190 }
5191
5192 static int
5193 sctp_are_there_new_addresses(struct sctp_association *asoc,
5194     struct mbuf *in_initpkt, int offset)
5195 {
5196         /*
5197          * Given a INIT packet, look through the packet to verify that there
5198          * are NO new addresses. As we go through the parameters add reports
5199          * of any un-understood parameters that require an error.  Also we
5200          * must return (1) to drop the packet if we see a un-understood
5201          * parameter that tells us to drop the chunk.
5202          */
5203         struct sockaddr *sa_touse;
5204         struct sockaddr *sa;
5205         struct sctp_paramhdr *phdr, params;
5206         uint16_t ptype, plen;
5207         uint8_t fnd;
5208         struct sctp_nets *net;
5209         struct ip *iph;
5210
5211 #ifdef INET
5212         struct sockaddr_in sin4, *sa4;
5213
5214 #endif
5215 #ifdef INET6
5216         struct sockaddr_in6 sin6, *sa6;
5217         struct ip6_hdr *ip6h;
5218
5219 #endif
5220
5221 #ifdef INET
5222         memset(&sin4, 0, sizeof(sin4));
5223         sin4.sin_family = AF_INET;
5224         sin4.sin_len = sizeof(sin4);
5225 #endif
5226 #ifdef INET6
5227         memset(&sin6, 0, sizeof(sin6));
5228         sin6.sin6_family = AF_INET6;
5229         sin6.sin6_len = sizeof(sin6);
5230 #endif
5231         sa_touse = NULL;
5232         /* First what about the src address of the pkt ? */
5233         iph = mtod(in_initpkt, struct ip *);
5234         switch (iph->ip_v) {
5235 #ifdef INET
5236         case IPVERSION:
5237                 /* source addr is IPv4 */
5238                 sin4.sin_addr = iph->ip_src;
5239                 sa_touse = (struct sockaddr *)&sin4;
5240                 break;
5241 #endif
5242 #ifdef INET6
5243         case IPV6_VERSION >> 4:
5244                 /* source addr is IPv6 */
5245                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
5246                 sin6.sin6_addr = ip6h->ip6_src;
5247                 sa_touse = (struct sockaddr *)&sin6;
5248                 break;
5249 #endif
5250         default:
5251                 return (1);
5252         }
5253
5254         fnd = 0;
5255         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5256                 sa = (struct sockaddr *)&net->ro._l_addr;
5257                 if (sa->sa_family == sa_touse->sa_family) {
5258 #ifdef INET
5259                         if (sa->sa_family == AF_INET) {
5260                                 sa4 = (struct sockaddr_in *)sa;
5261                                 if (sa4->sin_addr.s_addr == sin4.sin_addr.s_addr) {
5262                                         fnd = 1;
5263                                         break;
5264                                 }
5265                         }
5266 #endif
5267 #ifdef INET6
5268                         if (sa->sa_family == AF_INET6) {
5269                                 sa6 = (struct sockaddr_in6 *)sa;
5270                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, &sin6)) {
5271                                         fnd = 1;
5272                                         break;
5273                                 }
5274                         }
5275 #endif
5276                 }
5277         }
5278         if (fnd == 0) {
5279                 /* New address added! no need to look futher. */
5280                 return (1);
5281         }
5282         /* Ok so far lets munge through the rest of the packet */
5283         offset += sizeof(struct sctp_init_chunk);
5284         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5285         while (phdr) {
5286                 sa_touse = NULL;
5287                 ptype = ntohs(phdr->param_type);
5288                 plen = ntohs(phdr->param_length);
5289                 switch (ptype) {
5290 #ifdef INET
5291                 case SCTP_IPV4_ADDRESS:
5292                         {
5293                                 struct sctp_ipv4addr_param *p4, p4_buf;
5294
5295                                 phdr = sctp_get_next_param(in_initpkt, offset,
5296                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5297                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5298                                     phdr == NULL) {
5299                                         return (1);
5300                                 }
5301                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5302                                 sin4.sin_addr.s_addr = p4->addr;
5303                                 sa_touse = (struct sockaddr *)&sin4;
5304                                 break;
5305                         }
5306 #endif
5307 #ifdef INET6
5308                 case SCTP_IPV6_ADDRESS:
5309                         {
5310                                 struct sctp_ipv6addr_param *p6, p6_buf;
5311
5312                                 phdr = sctp_get_next_param(in_initpkt, offset,
5313                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5314                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5315                                     phdr == NULL) {
5316                                         return (1);
5317                                 }
5318                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5319                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5320                                     sizeof(p6->addr));
5321                                 sa_touse = (struct sockaddr *)&sin6;
5322                                 break;
5323                         }
5324 #endif
5325                 default:
5326                         sa_touse = NULL;
5327                         break;
5328                 }
5329                 if (sa_touse) {
5330                         /* ok, sa_touse points to one to check */
5331                         fnd = 0;
5332                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5333                                 sa = (struct sockaddr *)&net->ro._l_addr;
5334                                 if (sa->sa_family != sa_touse->sa_family) {
5335                                         continue;
5336                                 }
5337 #ifdef INET
5338                                 if (sa->sa_family == AF_INET) {
5339                                         sa4 = (struct sockaddr_in *)sa;
5340                                         if (sa4->sin_addr.s_addr ==
5341                                             sin4.sin_addr.s_addr) {
5342                                                 fnd = 1;
5343                                                 break;
5344                                         }
5345                                 }
5346 #endif
5347 #ifdef INET6
5348                                 if (sa->sa_family == AF_INET6) {
5349                                         sa6 = (struct sockaddr_in6 *)sa;
5350                                         if (SCTP6_ARE_ADDR_EQUAL(
5351                                             sa6, &sin6)) {
5352                                                 fnd = 1;
5353                                                 break;
5354                                         }
5355                                 }
5356 #endif
5357                         }
5358                         if (!fnd) {
5359                                 /* New addr added! no need to look further */
5360                                 return (1);
5361                         }
5362                 }
5363                 offset += SCTP_SIZE32(plen);
5364                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5365         }
5366         return (0);
5367 }
5368
5369 /*
5370  * Given a MBUF chain that was sent into us containing an INIT. Build a
5371  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5372  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5373  * message (i.e. the struct sctp_init_msg).
5374  */
5375 void
5376 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5377     struct mbuf *init_pkt, int iphlen, int offset,
5378     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5379     uint8_t use_mflowid, uint32_t mflowid,
5380     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5381 {
5382         struct sctp_association *asoc;
5383         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5384         struct sctp_init_ack_chunk *initack;
5385         struct sctp_adaptation_layer_indication *ali;
5386         struct sctp_ecn_supported_param *ecn;
5387         struct sctp_prsctp_supported_param *prsctp;
5388         struct sctp_supported_chunk_types_param *pr_supported;
5389         union sctp_sockstore store, store1, *over_addr;
5390
5391 #ifdef INET
5392         struct sockaddr_in *sin, *to_sin;
5393
5394 #endif
5395 #ifdef INET6
5396         struct sockaddr_in6 *sin6, *to_sin6;
5397
5398 #endif
5399         struct ip *iph;
5400
5401 #ifdef INET6
5402         struct ip6_hdr *ip6;
5403
5404 #endif
5405         struct sockaddr *to;
5406         struct sctp_state_cookie stc;
5407         struct sctp_nets *net = NULL;
5408         uint8_t *signature = NULL;
5409         int cnt_inits_to = 0;
5410         uint16_t his_limit, i_want;
5411         int abort_flag, padval;
5412         int num_ext;
5413         int p_len;
5414         int nat_friendly = 0;
5415         struct socket *so;
5416
5417         if (stcb)
5418                 asoc = &stcb->asoc;
5419         else
5420                 asoc = NULL;
5421         mp_last = NULL;
5422         if ((asoc != NULL) &&
5423             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5424             (sctp_are_there_new_addresses(asoc, init_pkt, offset))) {
5425                 /* new addresses, out of here in non-cookie-wait states */
5426                 /*
5427                  * Send a ABORT, we don't add the new address error clause
5428                  * though we even set the T bit and copy in the 0 tag.. this
5429                  * looks no different than if no listener was present.
5430                  */
5431                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL,
5432                     use_mflowid, mflowid,
5433                     vrf_id, port);
5434                 return;
5435         }
5436         abort_flag = 0;
5437         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5438             (offset + sizeof(struct sctp_init_chunk)),
5439             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5440         if (abort_flag) {
5441 do_a_abort:
5442                 sctp_send_abort(init_pkt, iphlen, sh,
5443                     init_chk->init.initiate_tag, op_err,
5444                     use_mflowid, mflowid,
5445                     vrf_id, port);
5446                 return;
5447         }
5448         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5449         if (m == NULL) {
5450                 /* No memory, INIT timer will re-attempt. */
5451                 if (op_err)
5452                         sctp_m_freem(op_err);
5453                 return;
5454         }
5455         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5456
5457         /* the time I built cookie */
5458         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5459
5460         /* populate any tie tags */
5461         if (asoc != NULL) {
5462                 /* unlock before tag selections */
5463                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5464                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5465                 stc.cookie_life = asoc->cookie_life;
5466                 net = asoc->primary_destination;
5467         } else {
5468                 stc.tie_tag_my_vtag = 0;
5469                 stc.tie_tag_peer_vtag = 0;
5470                 /* life I will award this cookie */
5471                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5472         }
5473
5474         /* copy in the ports for later check */
5475         stc.myport = sh->dest_port;
5476         stc.peerport = sh->src_port;
5477
5478         /*
5479          * If we wanted to honor cookie life extentions, we would add to
5480          * stc.cookie_life. For now we should NOT honor any extension
5481          */
5482         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5483         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5484                 struct inpcb *in_inp;
5485
5486                 /* Its a V6 socket */
5487                 in_inp = (struct inpcb *)inp;
5488                 stc.ipv6_addr_legal = 1;
5489                 /* Now look at the binding flag to see if V4 will be legal */
5490                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5491                         stc.ipv4_addr_legal = 1;
5492                 } else {
5493                         /* V4 addresses are NOT legal on the association */
5494                         stc.ipv4_addr_legal = 0;
5495                 }
5496         } else {
5497                 /* Its a V4 socket, no - V6 */
5498                 stc.ipv4_addr_legal = 1;
5499                 stc.ipv6_addr_legal = 0;
5500         }
5501
5502 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5503         stc.ipv4_scope = 1;
5504 #else
5505         stc.ipv4_scope = 0;
5506 #endif
5507         /* now for scope setup */
5508         memset((caddr_t)&store, 0, sizeof(store));
5509         memset((caddr_t)&store1, 0, sizeof(store1));
5510 #ifdef INET
5511         sin = &store.sin;
5512         to_sin = &store1.sin;
5513 #endif
5514 #ifdef INET6
5515         sin6 = &store.sin6;
5516         to_sin6 = &store1.sin6;
5517 #endif
5518         iph = mtod(init_pkt, struct ip *);
5519         /* establish the to_addr's */
5520         switch (iph->ip_v) {
5521 #ifdef INET
5522         case IPVERSION:
5523                 to_sin->sin_port = sh->dest_port;
5524                 to_sin->sin_family = AF_INET;
5525                 to_sin->sin_len = sizeof(struct sockaddr_in);
5526                 to_sin->sin_addr = iph->ip_dst;
5527                 break;
5528 #endif
5529 #ifdef INET6
5530         case IPV6_VERSION >> 4:
5531                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5532                 to_sin6->sin6_addr = ip6->ip6_dst;
5533                 to_sin6->sin6_scope_id = 0;
5534                 to_sin6->sin6_port = sh->dest_port;
5535                 to_sin6->sin6_family = AF_INET6;
5536                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5537                 break;
5538 #endif
5539         default:
5540                 goto do_a_abort;
5541                 break;
5542         }
5543
5544         if (net == NULL) {
5545                 to = (struct sockaddr *)&store;
5546                 switch (iph->ip_v) {
5547 #ifdef INET
5548                 case IPVERSION:
5549                         {
5550                                 sin->sin_family = AF_INET;
5551                                 sin->sin_len = sizeof(struct sockaddr_in);
5552                                 sin->sin_port = sh->src_port;
5553                                 sin->sin_addr = iph->ip_src;
5554                                 /* lookup address */
5555                                 stc.address[0] = sin->sin_addr.s_addr;
5556                                 stc.address[1] = 0;
5557                                 stc.address[2] = 0;
5558                                 stc.address[3] = 0;
5559                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5560                                 /* local from address */
5561                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5562                                 stc.laddress[1] = 0;
5563                                 stc.laddress[2] = 0;
5564                                 stc.laddress[3] = 0;
5565                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5566                                 /* scope_id is only for v6 */
5567                                 stc.scope_id = 0;
5568 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5569                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5570                                         stc.ipv4_scope = 1;
5571                                 }
5572 #else
5573                                 stc.ipv4_scope = 1;
5574 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5575                                 /* Must use the address in this case */
5576                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5577                                         stc.loopback_scope = 1;
5578                                         stc.ipv4_scope = 1;
5579                                         stc.site_scope = 1;
5580                                         stc.local_scope = 0;
5581                                 }
5582                                 break;
5583                         }
5584 #endif
5585 #ifdef INET6
5586                 case IPV6_VERSION >> 4:
5587                         {
5588                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5589                                 sin6->sin6_family = AF_INET6;
5590                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5591                                 sin6->sin6_port = sh->src_port;
5592                                 sin6->sin6_addr = ip6->ip6_src;
5593                                 /* lookup address */
5594                                 memcpy(&stc.address, &sin6->sin6_addr,
5595                                     sizeof(struct in6_addr));
5596                                 sin6->sin6_scope_id = 0;
5597                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5598                                 stc.scope_id = 0;
5599                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5600                                         /*
5601                                          * FIX ME: does this have scope from
5602                                          * rcvif?
5603                                          */
5604                                         (void)sa6_recoverscope(sin6);
5605                                         stc.scope_id = sin6->sin6_scope_id;
5606                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5607                                         stc.loopback_scope = 1;
5608                                         stc.local_scope = 0;
5609                                         stc.site_scope = 1;
5610                                         stc.ipv4_scope = 1;
5611                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5612                                         /*
5613                                          * If the new destination is a
5614                                          * LINK_LOCAL we must have common
5615                                          * both site and local scope. Don't
5616                                          * set local scope though since we
5617                                          * must depend on the source to be
5618                                          * added implicitly. We cannot
5619                                          * assure just because we share one
5620                                          * link that all links are common.
5621                                          */
5622                                         stc.local_scope = 0;
5623                                         stc.site_scope = 1;
5624                                         stc.ipv4_scope = 1;
5625                                         /*
5626                                          * we start counting for the private
5627                                          * address stuff at 1. since the
5628                                          * link local we source from won't
5629                                          * show up in our scoped count.
5630                                          */
5631                                         cnt_inits_to = 1;
5632                                         /*
5633                                          * pull out the scope_id from
5634                                          * incoming pkt
5635                                          */
5636                                         /*
5637                                          * FIX ME: does this have scope from
5638                                          * rcvif?
5639                                          */
5640                                         (void)sa6_recoverscope(sin6);
5641                                         stc.scope_id = sin6->sin6_scope_id;
5642                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5643                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5644                                         /*
5645                                          * If the new destination is
5646                                          * SITE_LOCAL then we must have site
5647                                          * scope in common.
5648                                          */
5649                                         stc.site_scope = 1;
5650                                 }
5651                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5652                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5653                                 break;
5654                         }
5655 #endif
5656                 default:
5657                         /* TSNH */
5658                         goto do_a_abort;
5659                         break;
5660                 }
5661         } else {
5662                 /* set the scope per the existing tcb */
5663
5664 #ifdef INET6
5665                 struct sctp_nets *lnet;
5666
5667 #endif
5668
5669                 stc.loopback_scope = asoc->loopback_scope;
5670                 stc.ipv4_scope = asoc->ipv4_local_scope;
5671                 stc.site_scope = asoc->site_scope;
5672                 stc.local_scope = asoc->local_scope;
5673 #ifdef INET6
5674                 /* Why do we not consider IPv4 LL addresses? */
5675                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5676                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5677                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5678                                         /*
5679                                          * if we have a LL address, start
5680                                          * counting at 1.
5681                                          */
5682                                         cnt_inits_to = 1;
5683                                 }
5684                         }
5685                 }
5686 #endif
5687                 /* use the net pointer */
5688                 to = (struct sockaddr *)&net->ro._l_addr;
5689                 switch (to->sa_family) {
5690 #ifdef INET
5691                 case AF_INET:
5692                         sin = (struct sockaddr_in *)to;
5693                         stc.address[0] = sin->sin_addr.s_addr;
5694                         stc.address[1] = 0;
5695                         stc.address[2] = 0;
5696                         stc.address[3] = 0;
5697                         stc.addr_type = SCTP_IPV4_ADDRESS;
5698                         if (net->src_addr_selected == 0) {
5699                                 /*
5700                                  * strange case here, the INIT should have
5701                                  * did the selection.
5702                                  */
5703                                 net->ro._s_addr = sctp_source_address_selection(inp,
5704                                     stcb, (sctp_route_t *) & net->ro,
5705                                     net, 0, vrf_id);
5706                                 if (net->ro._s_addr == NULL)
5707                                         return;
5708
5709                                 net->src_addr_selected = 1;
5710
5711                         }
5712                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5713                         stc.laddress[1] = 0;
5714                         stc.laddress[2] = 0;
5715                         stc.laddress[3] = 0;
5716                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5717                         /* scope_id is only for v6 */
5718                         stc.scope_id = 0;
5719                         break;
5720 #endif
5721 #ifdef INET6
5722                 case AF_INET6:
5723                         sin6 = (struct sockaddr_in6 *)to;
5724                         memcpy(&stc.address, &sin6->sin6_addr,
5725                             sizeof(struct in6_addr));
5726                         stc.addr_type = SCTP_IPV6_ADDRESS;
5727                         stc.scope_id = sin6->sin6_scope_id;
5728                         if (net->src_addr_selected == 0) {
5729                                 /*
5730                                  * strange case here, the INIT should have
5731                                  * did the selection.
5732                                  */
5733                                 net->ro._s_addr = sctp_source_address_selection(inp,
5734                                     stcb, (sctp_route_t *) & net->ro,
5735                                     net, 0, vrf_id);
5736                                 if (net->ro._s_addr == NULL)
5737                                         return;
5738
5739                                 net->src_addr_selected = 1;
5740                         }
5741                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5742                             sizeof(struct in6_addr));
5743                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5744                         break;
5745 #endif
5746                 }
5747         }
5748         /* Now lets put the SCTP header in place */
5749         initack = mtod(m, struct sctp_init_ack_chunk *);
5750         /* Save it off for quick ref */
5751         stc.peers_vtag = init_chk->init.initiate_tag;
5752         /* who are we */
5753         memcpy(stc.identification, SCTP_VERSION_STRING,
5754             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5755         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5756         /* now the chunk header */
5757         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5758         initack->ch.chunk_flags = 0;
5759         /* fill in later from mbuf we build */
5760         initack->ch.chunk_length = 0;
5761         /* place in my tag */
5762         if ((asoc != NULL) &&
5763             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5764             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5765             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5766                 /* re-use the v-tags and init-seq here */
5767                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5768                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5769         } else {
5770                 uint32_t vtag, itsn;
5771
5772                 if (hold_inp_lock) {
5773                         SCTP_INP_INCR_REF(inp);
5774                         SCTP_INP_RUNLOCK(inp);
5775                 }
5776                 if (asoc) {
5777                         atomic_add_int(&asoc->refcnt, 1);
5778                         SCTP_TCB_UNLOCK(stcb);
5779         new_tag:
5780                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5781                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5782                                 /*
5783                                  * Got a duplicate vtag on some guy behind a
5784                                  * nat make sure we don't use it.
5785                                  */
5786                                 goto new_tag;
5787                         }
5788                         initack->init.initiate_tag = htonl(vtag);
5789                         /* get a TSN to use too */
5790                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5791                         initack->init.initial_tsn = htonl(itsn);
5792                         SCTP_TCB_LOCK(stcb);
5793                         atomic_add_int(&asoc->refcnt, -1);
5794                 } else {
5795                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5796                         initack->init.initiate_tag = htonl(vtag);
5797                         /* get a TSN to use too */
5798                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5799                 }
5800                 if (hold_inp_lock) {
5801                         SCTP_INP_RLOCK(inp);
5802                         SCTP_INP_DECR_REF(inp);
5803                 }
5804         }
5805         /* save away my tag to */
5806         stc.my_vtag = initack->init.initiate_tag;
5807
5808         /* set up some of the credits. */
5809         so = inp->sctp_socket;
5810         if (so == NULL) {
5811                 /* memory problem */
5812                 sctp_m_freem(m);
5813                 return;
5814         } else {
5815                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5816         }
5817         /* set what I want */
5818         his_limit = ntohs(init_chk->init.num_inbound_streams);
5819         /* choose what I want */
5820         if (asoc != NULL) {
5821                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5822                         i_want = asoc->streamoutcnt;
5823                 } else {
5824                         i_want = inp->sctp_ep.pre_open_stream_count;
5825                 }
5826         } else {
5827                 i_want = inp->sctp_ep.pre_open_stream_count;
5828         }
5829         if (his_limit < i_want) {
5830                 /* I Want more :< */
5831                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5832         } else {
5833                 /* I can have what I want :> */
5834                 initack->init.num_outbound_streams = htons(i_want);
5835         }
5836         /* tell him his limt. */
5837         initack->init.num_inbound_streams =
5838             htons(inp->sctp_ep.max_open_streams_intome);
5839
5840         /* adaptation layer indication parameter */
5841         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5842         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5843         ali->ph.param_length = htons(sizeof(*ali));
5844         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5845         SCTP_BUF_LEN(m) += sizeof(*ali);
5846         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5847
5848         /* ECN parameter */
5849         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5850             (inp->sctp_ecn_enable == 1)) {
5851                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5852                 ecn->ph.param_length = htons(sizeof(*ecn));
5853                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5854
5855                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5856                     sizeof(*ecn));
5857         } else {
5858                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5859         }
5860         /* And now tell the peer we do  pr-sctp */
5861         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5862         prsctp->ph.param_length = htons(sizeof(*prsctp));
5863         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5864         if (nat_friendly) {
5865                 /* Add NAT friendly parameter */
5866                 struct sctp_paramhdr *ph;
5867
5868                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5869                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5870                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5871                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5872         }
5873         /* And now tell the peer we do all the extensions */
5874         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5875         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5876         num_ext = 0;
5877         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5878         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5879         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5880         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5881         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5882         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5883                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5884         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5885                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5886         p_len = sizeof(*pr_supported) + num_ext;
5887         pr_supported->ph.param_length = htons(p_len);
5888         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5889         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5890
5891         /* add authentication parameters */
5892         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5893                 struct sctp_auth_random *randp;
5894                 struct sctp_auth_hmac_algo *hmacs;
5895                 struct sctp_auth_chunk_list *chunks;
5896                 uint16_t random_len;
5897
5898                 /* generate and add RANDOM parameter */
5899                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5900                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5901                 randp->ph.param_type = htons(SCTP_RANDOM);
5902                 p_len = sizeof(*randp) + random_len;
5903                 randp->ph.param_length = htons(p_len);
5904                 SCTP_READ_RANDOM(randp->random_data, random_len);
5905                 /* zero out any padding required */
5906                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5907                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5908
5909                 /* add HMAC_ALGO parameter */
5910                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5911                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5912                     (uint8_t *) hmacs->hmac_ids);
5913                 if (p_len > 0) {
5914                         p_len += sizeof(*hmacs);
5915                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5916                         hmacs->ph.param_length = htons(p_len);
5917                         /* zero out any padding required */
5918                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5919                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5920                 }
5921                 /* add CHUNKS parameter */
5922                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5923                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5924                     chunks->chunk_types);
5925                 if (p_len > 0) {
5926                         p_len += sizeof(*chunks);
5927                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5928                         chunks->ph.param_length = htons(p_len);
5929                         /* zero out any padding required */
5930                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5931                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5932                 }
5933         }
5934         m_at = m;
5935         /* now the addresses */
5936         {
5937                 struct sctp_scoping scp;
5938
5939                 /*
5940                  * To optimize this we could put the scoping stuff into a
5941                  * structure and remove the individual uint8's from the stc
5942                  * structure. Then we could just sifa in the address within
5943                  * the stc.. but for now this is a quick hack to get the
5944                  * address stuff teased apart.
5945                  */
5946                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5947                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5948                 scp.loopback_scope = stc.loopback_scope;
5949                 scp.ipv4_local_scope = stc.ipv4_scope;
5950                 scp.local_scope = stc.local_scope;
5951                 scp.site_scope = stc.site_scope;
5952                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5953         }
5954
5955         /* tack on the operational error if present */
5956         if (op_err) {
5957                 struct mbuf *ol;
5958                 int llen;
5959
5960                 llen = 0;
5961                 ol = op_err;
5962
5963                 while (ol) {
5964                         llen += SCTP_BUF_LEN(ol);
5965                         ol = SCTP_BUF_NEXT(ol);
5966                 }
5967                 if (llen % 4) {
5968                         /* must add a pad to the param */
5969                         uint32_t cpthis = 0;
5970                         int padlen;
5971
5972                         padlen = 4 - (llen % 4);
5973                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5974                 }
5975                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5976                         m_at = SCTP_BUF_NEXT(m_at);
5977                 }
5978                 SCTP_BUF_NEXT(m_at) = op_err;
5979                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5980                         m_at = SCTP_BUF_NEXT(m_at);
5981                 }
5982         }
5983         /* pre-calulate the size and update pkt header and chunk header */
5984         p_len = 0;
5985         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5986                 p_len += SCTP_BUF_LEN(m_tmp);
5987                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
5988                         /* m_tmp should now point to last one */
5989                         break;
5990                 }
5991         }
5992
5993         /* Now we must build a cookie */
5994         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
5995         if (m_cookie == NULL) {
5996                 /* memory problem */
5997                 sctp_m_freem(m);
5998                 return;
5999         }
6000         /* Now append the cookie to the end and update the space/size */
6001         SCTP_BUF_NEXT(m_tmp) = m_cookie;
6002
6003         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6004                 p_len += SCTP_BUF_LEN(m_tmp);
6005                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6006                         /* m_tmp should now point to last one */
6007                         mp_last = m_tmp;
6008                         break;
6009                 }
6010         }
6011         /*
6012          * Place in the size, but we don't include the last pad (if any) in
6013          * the INIT-ACK.
6014          */
6015         initack->ch.chunk_length = htons(p_len);
6016
6017         /*
6018          * Time to sign the cookie, we don't sign over the cookie signature
6019          * though thus we set trailer.
6020          */
6021         (void)sctp_hmac_m(SCTP_HMAC,
6022             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6023             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6024             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6025         /*
6026          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6027          * here since the timer will drive a retranmission.
6028          */
6029         padval = p_len % 4;
6030         if ((padval) && (mp_last)) {
6031                 /* see my previous comments on mp_last */
6032                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
6033                         /* Houston we have a problem, no space */
6034                         sctp_m_freem(m);
6035                         return;
6036                 }
6037         }
6038         if (stc.loopback_scope) {
6039                 over_addr = &store1;
6040         } else {
6041                 over_addr = NULL;
6042         }
6043
6044         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6045             0, 0,
6046             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6047             port, over_addr,
6048             use_mflowid, mflowid,
6049             SCTP_SO_NOT_LOCKED);
6050         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6051 }
6052
6053
6054 static void
6055 sctp_prune_prsctp(struct sctp_tcb *stcb,
6056     struct sctp_association *asoc,
6057     struct sctp_sndrcvinfo *srcv,
6058     int dataout)
6059 {
6060         int freed_spc = 0;
6061         struct sctp_tmit_chunk *chk, *nchk;
6062
6063         SCTP_TCB_LOCK_ASSERT(stcb);
6064         if ((asoc->peer_supports_prsctp) &&
6065             (asoc->sent_queue_cnt_removeable > 0)) {
6066                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6067                         /*
6068                          * Look for chunks marked with the PR_SCTP flag AND
6069                          * the buffer space flag. If the one being sent is
6070                          * equal or greater priority then purge the old one
6071                          * and free some space.
6072                          */
6073                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6074                                 /*
6075                                  * This one is PR-SCTP AND buffer space
6076                                  * limited type
6077                                  */
6078                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6079                                         /*
6080                                          * Lower numbers equates to higher
6081                                          * priority so if the one we are
6082                                          * looking at has a larger or equal
6083                                          * priority we want to drop the data
6084                                          * and NOT retransmit it.
6085                                          */
6086                                         if (chk->data) {
6087                                                 /*
6088                                                  * We release the book_size
6089                                                  * if the mbuf is here
6090                                                  */
6091                                                 int ret_spc;
6092                                                 uint8_t sent;
6093
6094                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6095                                                         sent = 1;
6096                                                 else
6097                                                         sent = 0;
6098                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6099                                                     sent,
6100                                                     SCTP_SO_LOCKED);
6101                                                 freed_spc += ret_spc;
6102                                                 if (freed_spc >= dataout) {
6103                                                         return;
6104                                                 }
6105                                         }       /* if chunk was present */
6106                                 }       /* if of sufficent priority */
6107                         }       /* if chunk has enabled */
6108                 }               /* tailqforeach */
6109
6110                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6111                         /* Here we must move to the sent queue and mark */
6112                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6113                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6114                                         if (chk->data) {
6115                                                 /*
6116                                                  * We release the book_size
6117                                                  * if the mbuf is here
6118                                                  */
6119                                                 int ret_spc;
6120
6121                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6122                                                     0, SCTP_SO_LOCKED);
6123
6124                                                 freed_spc += ret_spc;
6125                                                 if (freed_spc >= dataout) {
6126                                                         return;
6127                                                 }
6128                                         }       /* end if chk->data */
6129                                 }       /* end if right class */
6130                         }       /* end if chk pr-sctp */
6131                 }               /* tailqforeachsafe (chk) */
6132         }                       /* if enabled in asoc */
6133 }
6134
6135 int
6136 sctp_get_frag_point(struct sctp_tcb *stcb,
6137     struct sctp_association *asoc)
6138 {
6139         int siz, ovh;
6140
6141         /*
6142          * For endpoints that have both v6 and v4 addresses we must reserve
6143          * room for the ipv6 header, for those that are only dealing with V4
6144          * we use a larger frag point.
6145          */
6146         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6147                 ovh = SCTP_MED_OVERHEAD;
6148         } else {
6149                 ovh = SCTP_MED_V4_OVERHEAD;
6150         }
6151
6152         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6153                 siz = asoc->smallest_mtu - ovh;
6154         else
6155                 siz = (stcb->asoc.sctp_frag_point - ovh);
6156         /*
6157          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6158          */
6159         /* A data chunk MUST fit in a cluster */
6160         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6161         /* } */
6162
6163         /* adjust for an AUTH chunk if DATA requires auth */
6164         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6165                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6166
6167         if (siz % 4) {
6168                 /* make it an even word boundary please */
6169                 siz -= (siz % 4);
6170         }
6171         return (siz);
6172 }
6173
6174 static void
6175 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6176 {
6177         sp->pr_sctp_on = 0;
6178         /*
6179          * We assume that the user wants PR_SCTP_TTL if the user provides a
6180          * positive lifetime but does not specify any PR_SCTP policy. This
6181          * is a BAD assumption and causes problems at least with the
6182          * U-Vancovers MPI folks. I will change this to be no policy means
6183          * NO PR-SCTP.
6184          */
6185         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6186                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6187                 sp->pr_sctp_on = 1;
6188         } else {
6189                 return;
6190         }
6191         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6192         case CHUNK_FLAGS_PR_SCTP_BUF:
6193                 /*
6194                  * Time to live is a priority stored in tv_sec when doing
6195                  * the buffer drop thing.
6196                  */
6197                 sp->ts.tv_sec = sp->timetolive;
6198                 sp->ts.tv_usec = 0;
6199                 break;
6200         case CHUNK_FLAGS_PR_SCTP_TTL:
6201                 {
6202                         struct timeval tv;
6203
6204                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6205                         tv.tv_sec = sp->timetolive / 1000;
6206                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6207                         /*
6208                          * TODO sctp_constants.h needs alternative time
6209                          * macros when _KERNEL is undefined.
6210                          */
6211                         timevaladd(&sp->ts, &tv);
6212                 }
6213                 break;
6214         case CHUNK_FLAGS_PR_SCTP_RTX:
6215                 /*
6216                  * Time to live is a the number or retransmissions stored in
6217                  * tv_sec.
6218                  */
6219                 sp->ts.tv_sec = sp->timetolive;
6220                 sp->ts.tv_usec = 0;
6221                 break;
6222         default:
6223                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6224                     "Unknown PR_SCTP policy %u.\n",
6225                     PR_SCTP_POLICY(sp->sinfo_flags));
6226                 break;
6227         }
6228 }
6229
6230 static int
6231 sctp_msg_append(struct sctp_tcb *stcb,
6232     struct sctp_nets *net,
6233     struct mbuf *m,
6234     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6235 {
6236         int error = 0;
6237         struct mbuf *at;
6238         struct sctp_stream_queue_pending *sp = NULL;
6239         struct sctp_stream_out *strm;
6240
6241         /*
6242          * Given an mbuf chain, put it into the association send queue and
6243          * place it on the wheel
6244          */
6245         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6246                 /* Invalid stream number */
6247                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6248                 error = EINVAL;
6249                 goto out_now;
6250         }
6251         if ((stcb->asoc.stream_locked) &&
6252             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6253                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6254                 error = EINVAL;
6255                 goto out_now;
6256         }
6257         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6258         /* Now can we send this? */
6259         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6260             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6261             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6262             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6263                 /* got data while shutting down */
6264                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6265                 error = ECONNRESET;
6266                 goto out_now;
6267         }
6268         sctp_alloc_a_strmoq(stcb, sp);
6269         if (sp == NULL) {
6270                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6271                 error = ENOMEM;
6272                 goto out_now;
6273         }
6274         sp->sinfo_flags = srcv->sinfo_flags;
6275         sp->timetolive = srcv->sinfo_timetolive;
6276         sp->ppid = srcv->sinfo_ppid;
6277         sp->context = srcv->sinfo_context;
6278         sp->strseq = 0;
6279         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6280                 sp->net = net;
6281                 atomic_add_int(&sp->net->ref_count, 1);
6282         } else {
6283                 sp->net = NULL;
6284         }
6285         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6286         sp->stream = srcv->sinfo_stream;
6287         sp->msg_is_complete = 1;
6288         sp->sender_all_done = 1;
6289         sp->some_taken = 0;
6290         sp->data = m;
6291         sp->tail_mbuf = NULL;
6292         sctp_set_prsctp_policy(sp);
6293         /*
6294          * We could in theory (for sendall) sifa the length in, but we would
6295          * still have to hunt through the chain since we need to setup the
6296          * tail_mbuf
6297          */
6298         sp->length = 0;
6299         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6300                 if (SCTP_BUF_NEXT(at) == NULL)
6301                         sp->tail_mbuf = at;
6302                 sp->length += SCTP_BUF_LEN(at);
6303         }
6304         if (srcv->sinfo_keynumber_valid) {
6305                 sp->auth_keyid = srcv->sinfo_keynumber;
6306         } else {
6307                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6308         }
6309         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6310                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6311                 sp->holds_key_ref = 1;
6312         }
6313         if (hold_stcb_lock == 0) {
6314                 SCTP_TCB_SEND_LOCK(stcb);
6315         }
6316         sctp_snd_sb_alloc(stcb, sp->length);
6317         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6318         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6319         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6320                 sp->strseq = strm->next_sequence_sent;
6321                 strm->next_sequence_sent++;
6322         }
6323         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6324         m = NULL;
6325         if (hold_stcb_lock == 0) {
6326                 SCTP_TCB_SEND_UNLOCK(stcb);
6327         }
6328 out_now:
6329         if (m) {
6330                 sctp_m_freem(m);
6331         }
6332         return (error);
6333 }
6334
6335
6336 static struct mbuf *
6337 sctp_copy_mbufchain(struct mbuf *clonechain,
6338     struct mbuf *outchain,
6339     struct mbuf **endofchain,
6340     int can_take_mbuf,
6341     int sizeofcpy,
6342     uint8_t copy_by_ref)
6343 {
6344         struct mbuf *m;
6345         struct mbuf *appendchain;
6346         caddr_t cp;
6347         int len;
6348
6349         if (endofchain == NULL) {
6350                 /* error */
6351 error_out:
6352                 if (outchain)
6353                         sctp_m_freem(outchain);
6354                 return (NULL);
6355         }
6356         if (can_take_mbuf) {
6357                 appendchain = clonechain;
6358         } else {
6359                 if (!copy_by_ref &&
6360                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6361                     ) {
6362                         /* Its not in a cluster */
6363                         if (*endofchain == NULL) {
6364                                 /* lets get a mbuf cluster */
6365                                 if (outchain == NULL) {
6366                                         /* This is the general case */
6367                         new_mbuf:
6368                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6369                                         if (outchain == NULL) {
6370                                                 goto error_out;
6371                                         }
6372                                         SCTP_BUF_LEN(outchain) = 0;
6373                                         *endofchain = outchain;
6374                                         /* get the prepend space */
6375                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6376                                 } else {
6377                                         /*
6378                                          * We really should not get a NULL
6379                                          * in endofchain
6380                                          */
6381                                         /* find end */
6382                                         m = outchain;
6383                                         while (m) {
6384                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6385                                                         *endofchain = m;
6386                                                         break;
6387                                                 }
6388                                                 m = SCTP_BUF_NEXT(m);
6389                                         }
6390                                         /* sanity */
6391                                         if (*endofchain == NULL) {
6392                                                 /*
6393                                                  * huh, TSNH XXX maybe we
6394                                                  * should panic
6395                                                  */
6396                                                 sctp_m_freem(outchain);
6397                                                 goto new_mbuf;
6398                                         }
6399                                 }
6400                                 /* get the new end of length */
6401                                 len = M_TRAILINGSPACE(*endofchain);
6402                         } else {
6403                                 /* how much is left at the end? */
6404                                 len = M_TRAILINGSPACE(*endofchain);
6405                         }
6406                         /* Find the end of the data, for appending */
6407                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6408
6409                         /* Now lets copy it out */
6410                         if (len >= sizeofcpy) {
6411                                 /* It all fits, copy it in */
6412                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6413                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6414                         } else {
6415                                 /* fill up the end of the chain */
6416                                 if (len > 0) {
6417                                         m_copydata(clonechain, 0, len, cp);
6418                                         SCTP_BUF_LEN((*endofchain)) += len;
6419                                         /* now we need another one */
6420                                         sizeofcpy -= len;
6421                                 }
6422                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6423                                 if (m == NULL) {
6424                                         /* We failed */
6425                                         goto error_out;
6426                                 }
6427                                 SCTP_BUF_NEXT((*endofchain)) = m;
6428                                 *endofchain = m;
6429                                 cp = mtod((*endofchain), caddr_t);
6430                                 m_copydata(clonechain, len, sizeofcpy, cp);
6431                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6432                         }
6433                         return (outchain);
6434                 } else {
6435                         /* copy the old fashion way */
6436                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6437 #ifdef SCTP_MBUF_LOGGING
6438                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6439                                 struct mbuf *mat;
6440
6441                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6442                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6443                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6444                                         }
6445                                 }
6446                         }
6447 #endif
6448                 }
6449         }
6450         if (appendchain == NULL) {
6451                 /* error */
6452                 if (outchain)
6453                         sctp_m_freem(outchain);
6454                 return (NULL);
6455         }
6456         if (outchain) {
6457                 /* tack on to the end */
6458                 if (*endofchain != NULL) {
6459                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6460                 } else {
6461                         m = outchain;
6462                         while (m) {
6463                                 if (SCTP_BUF_NEXT(m) == NULL) {
6464                                         SCTP_BUF_NEXT(m) = appendchain;
6465                                         break;
6466                                 }
6467                                 m = SCTP_BUF_NEXT(m);
6468                         }
6469                 }
6470                 /*
6471                  * save off the end and update the end-chain postion
6472                  */
6473                 m = appendchain;
6474                 while (m) {
6475                         if (SCTP_BUF_NEXT(m) == NULL) {
6476                                 *endofchain = m;
6477                                 break;
6478                         }
6479                         m = SCTP_BUF_NEXT(m);
6480                 }
6481                 return (outchain);
6482         } else {
6483                 /* save off the end and update the end-chain postion */
6484                 m = appendchain;
6485                 while (m) {
6486                         if (SCTP_BUF_NEXT(m) == NULL) {
6487                                 *endofchain = m;
6488                                 break;
6489                         }
6490                         m = SCTP_BUF_NEXT(m);
6491                 }
6492                 return (appendchain);
6493         }
6494 }
6495
6496 int
6497 sctp_med_chunk_output(struct sctp_inpcb *inp,
6498     struct sctp_tcb *stcb,
6499     struct sctp_association *asoc,
6500     int *num_out,
6501     int *reason_code,
6502     int control_only, int from_where,
6503     struct timeval *now, int *now_filled, int frag_point, int so_locked
6504 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6505     SCTP_UNUSED
6506 #endif
6507 );
6508
6509 static void
6510 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6511     uint32_t val SCTP_UNUSED)
6512 {
6513         struct sctp_copy_all *ca;
6514         struct mbuf *m;
6515         int ret = 0;
6516         int added_control = 0;
6517         int un_sent, do_chunk_output = 1;
6518         struct sctp_association *asoc;
6519         struct sctp_nets *net;
6520
6521         ca = (struct sctp_copy_all *)ptr;
6522         if (ca->m == NULL) {
6523                 return;
6524         }
6525         if (ca->inp != inp) {
6526                 /* TSNH */
6527                 return;
6528         }
6529         if ((ca->m) && ca->sndlen) {
6530                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6531                 if (m == NULL) {
6532                         /* can't copy so we are done */
6533                         ca->cnt_failed++;
6534                         return;
6535                 }
6536 #ifdef SCTP_MBUF_LOGGING
6537                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6538                         struct mbuf *mat;
6539
6540                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6541                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6542                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6543                                 }
6544                         }
6545                 }
6546 #endif
6547         } else {
6548                 m = NULL;
6549         }
6550         SCTP_TCB_LOCK_ASSERT(stcb);
6551         if (stcb->asoc.alternate) {
6552                 net = stcb->asoc.alternate;
6553         } else {
6554                 net = stcb->asoc.primary_destination;
6555         }
6556         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6557                 /* Abort this assoc with m as the user defined reason */
6558                 if (m) {
6559                         struct sctp_paramhdr *ph;
6560
6561                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6562                         if (m) {
6563                                 ph = mtod(m, struct sctp_paramhdr *);
6564                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6565                                 ph->param_length = htons(ca->sndlen);
6566                         }
6567                         /*
6568                          * We add one here to keep the assoc from
6569                          * dis-appearing on us.
6570                          */
6571                         atomic_add_int(&stcb->asoc.refcnt, 1);
6572                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6573                         /*
6574                          * sctp_abort_an_association calls sctp_free_asoc()
6575                          * free association will NOT free it since we
6576                          * incremented the refcnt .. we do this to prevent
6577                          * it being freed and things getting tricky since we
6578                          * could end up (from free_asoc) calling inpcb_free
6579                          * which would get a recursive lock call to the
6580                          * iterator lock.. But as a consequence of that the
6581                          * stcb will return to us un-locked.. since
6582                          * free_asoc returns with either no TCB or the TCB
6583                          * unlocked, we must relock.. to unlock in the
6584                          * iterator timer :-0
6585                          */
6586                         SCTP_TCB_LOCK(stcb);
6587                         atomic_add_int(&stcb->asoc.refcnt, -1);
6588                         goto no_chunk_output;
6589                 }
6590         } else {
6591                 if (m) {
6592                         ret = sctp_msg_append(stcb, net, m,
6593                             &ca->sndrcv, 1);
6594                 }
6595                 asoc = &stcb->asoc;
6596                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6597                         /* shutdown this assoc */
6598                         int cnt;
6599
6600                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6601
6602                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6603                             TAILQ_EMPTY(&asoc->sent_queue) &&
6604                             (cnt == 0)) {
6605                                 if (asoc->locked_on_sending) {
6606                                         goto abort_anyway;
6607                                 }
6608                                 /*
6609                                  * there is nothing queued to send, so I'm
6610                                  * done...
6611                                  */
6612                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6613                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6614                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6615                                         /*
6616                                          * only send SHUTDOWN the first time
6617                                          * through
6618                                          */
6619                                         sctp_send_shutdown(stcb, net);
6620                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6621                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6622                                         }
6623                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6624                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6625                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6626                                             net);
6627                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6628                                             asoc->primary_destination);
6629                                         added_control = 1;
6630                                         do_chunk_output = 0;
6631                                 }
6632                         } else {
6633                                 /*
6634                                  * we still got (or just got) data to send,
6635                                  * so set SHUTDOWN_PENDING
6636                                  */
6637                                 /*
6638                                  * XXX sockets draft says that SCTP_EOF
6639                                  * should be sent with no data.  currently,
6640                                  * we will allow user data to be sent first
6641                                  * and move to SHUTDOWN-PENDING
6642                                  */
6643                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6644                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6645                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6646                                         if (asoc->locked_on_sending) {
6647                                                 /*
6648                                                  * Locked to send out the
6649                                                  * data
6650                                                  */
6651                                                 struct sctp_stream_queue_pending *sp;
6652
6653                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6654                                                 if (sp) {
6655                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6656                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6657                                                 }
6658                                         }
6659                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6660                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6661                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6662                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6663                                 abort_anyway:
6664                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6665                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6666                                                     NULL, SCTP_SO_NOT_LOCKED);
6667                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6668                                                 goto no_chunk_output;
6669                                         }
6670                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6671                                             asoc->primary_destination);
6672                                 }
6673                         }
6674
6675                 }
6676         }
6677         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6678             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6679
6680         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6681             (stcb->asoc.total_flight > 0) &&
6682             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6683             ) {
6684                 do_chunk_output = 0;
6685         }
6686         if (do_chunk_output)
6687                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6688         else if (added_control) {
6689                 int num_out = 0, reason = 0, now_filled = 0;
6690                 struct timeval now;
6691                 int frag_point;
6692
6693                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6694                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6695                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6696         }
6697 no_chunk_output:
6698         if (ret) {
6699                 ca->cnt_failed++;
6700         } else {
6701                 ca->cnt_sent++;
6702         }
6703 }
6704
6705 static void
6706 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6707 {
6708         struct sctp_copy_all *ca;
6709
6710         ca = (struct sctp_copy_all *)ptr;
6711         /*
6712          * Do a notify here? Kacheong suggests that the notify be done at
6713          * the send time.. so you would push up a notification if any send
6714          * failed. Don't know if this is feasable since the only failures we
6715          * have is "memory" related and if you cannot get an mbuf to send
6716          * the data you surely can't get an mbuf to send up to notify the
6717          * user you can't send the data :->
6718          */
6719
6720         /* now free everything */
6721         sctp_m_freem(ca->m);
6722         SCTP_FREE(ca, SCTP_M_COPYAL);
6723 }
6724
6725
6726 #define MC_ALIGN(m, len) do {                                           \
6727         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6728 } while (0)
6729
6730
6731
6732 static struct mbuf *
6733 sctp_copy_out_all(struct uio *uio, int len)
6734 {
6735         struct mbuf *ret, *at;
6736         int left, willcpy, cancpy, error;
6737
6738         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6739         if (ret == NULL) {
6740                 /* TSNH */
6741                 return (NULL);
6742         }
6743         left = len;
6744         SCTP_BUF_LEN(ret) = 0;
6745         /* save space for the data chunk header */
6746         cancpy = M_TRAILINGSPACE(ret);
6747         willcpy = min(cancpy, left);
6748         at = ret;
6749         while (left > 0) {
6750                 /* Align data to the end */
6751                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6752                 if (error) {
6753         err_out_now:
6754                         sctp_m_freem(at);
6755                         return (NULL);
6756                 }
6757                 SCTP_BUF_LEN(at) = willcpy;
6758                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6759                 left -= willcpy;
6760                 if (left > 0) {
6761                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6762                         if (SCTP_BUF_NEXT(at) == NULL) {
6763                                 goto err_out_now;
6764                         }
6765                         at = SCTP_BUF_NEXT(at);
6766                         SCTP_BUF_LEN(at) = 0;
6767                         cancpy = M_TRAILINGSPACE(at);
6768                         willcpy = min(cancpy, left);
6769                 }
6770         }
6771         return (ret);
6772 }
6773
6774 static int
6775 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6776     struct sctp_sndrcvinfo *srcv)
6777 {
6778         int ret;
6779         struct sctp_copy_all *ca;
6780
6781         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6782             SCTP_M_COPYAL);
6783         if (ca == NULL) {
6784                 sctp_m_freem(m);
6785                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6786                 return (ENOMEM);
6787         }
6788         memset(ca, 0, sizeof(struct sctp_copy_all));
6789
6790         ca->inp = inp;
6791         if (srcv) {
6792                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6793         }
6794         /*
6795          * take off the sendall flag, it would be bad if we failed to do
6796          * this :-0
6797          */
6798         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6799         /* get length and mbuf chain */
6800         if (uio) {
6801                 ca->sndlen = uio->uio_resid;
6802                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6803                 if (ca->m == NULL) {
6804                         SCTP_FREE(ca, SCTP_M_COPYAL);
6805                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6806                         return (ENOMEM);
6807                 }
6808         } else {
6809                 /* Gather the length of the send */
6810                 struct mbuf *mat;
6811
6812                 mat = m;
6813                 ca->sndlen = 0;
6814                 while (m) {
6815                         ca->sndlen += SCTP_BUF_LEN(m);
6816                         m = SCTP_BUF_NEXT(m);
6817                 }
6818                 ca->m = mat;
6819         }
6820         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6821             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6822             SCTP_ASOC_ANY_STATE,
6823             (void *)ca, 0,
6824             sctp_sendall_completes, inp, 1);
6825         if (ret) {
6826                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6827                 SCTP_FREE(ca, SCTP_M_COPYAL);
6828                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6829                 return (EFAULT);
6830         }
6831         return (0);
6832 }
6833
6834
6835 void
6836 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6837 {
6838         struct sctp_tmit_chunk *chk, *nchk;
6839
6840         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6841                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6842                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6843                         if (chk->data) {
6844                                 sctp_m_freem(chk->data);
6845                                 chk->data = NULL;
6846                         }
6847                         asoc->ctrl_queue_cnt--;
6848                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6849                 }
6850         }
6851 }
6852
6853 void
6854 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6855 {
6856         struct sctp_association *asoc;
6857         struct sctp_tmit_chunk *chk, *nchk;
6858         struct sctp_asconf_chunk *acp;
6859
6860         asoc = &stcb->asoc;
6861         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6862                 /* find SCTP_ASCONF chunk in queue */
6863                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6864                         if (chk->data) {
6865                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6866                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6867                                         /* Not Acked yet */
6868                                         break;
6869                                 }
6870                         }
6871                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6872                         if (chk->data) {
6873                                 sctp_m_freem(chk->data);
6874                                 chk->data = NULL;
6875                         }
6876                         asoc->ctrl_queue_cnt--;
6877                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6878                 }
6879         }
6880 }
6881
6882
6883 static void
6884 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6885     struct sctp_association *asoc,
6886     struct sctp_tmit_chunk **data_list,
6887     int bundle_at,
6888     struct sctp_nets *net)
6889 {
6890         int i;
6891         struct sctp_tmit_chunk *tp1;
6892
6893         for (i = 0; i < bundle_at; i++) {
6894                 /* off of the send queue */
6895                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6896                 asoc->send_queue_cnt--;
6897                 if (i > 0) {
6898                         /*
6899                          * Any chunk NOT 0 you zap the time chunk 0 gets
6900                          * zapped or set based on if a RTO measurment is
6901                          * needed.
6902                          */
6903                         data_list[i]->do_rtt = 0;
6904                 }
6905                 /* record time */
6906                 data_list[i]->sent_rcv_time = net->last_sent_time;
6907                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6908                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6909                 if (data_list[i]->whoTo == NULL) {
6910                         data_list[i]->whoTo = net;
6911                         atomic_add_int(&net->ref_count, 1);
6912                 }
6913                 /* on to the sent queue */
6914                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6915                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6916                         struct sctp_tmit_chunk *tpp;
6917
6918                         /* need to move back */
6919         back_up_more:
6920                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6921                         if (tpp == NULL) {
6922                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6923                                 goto all_done;
6924                         }
6925                         tp1 = tpp;
6926                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6927                                 goto back_up_more;
6928                         }
6929                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6930                 } else {
6931                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6932                             data_list[i],
6933                             sctp_next);
6934                 }
6935 all_done:
6936                 /* This does not lower until the cum-ack passes it */
6937                 asoc->sent_queue_cnt++;
6938                 if ((asoc->peers_rwnd <= 0) &&
6939                     (asoc->total_flight == 0) &&
6940                     (bundle_at == 1)) {
6941                         /* Mark the chunk as being a window probe */
6942                         SCTP_STAT_INCR(sctps_windowprobed);
6943                 }
6944 #ifdef SCTP_AUDITING_ENABLED
6945                 sctp_audit_log(0xC2, 3);
6946 #endif
6947                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6948                 data_list[i]->snd_count = 1;
6949                 data_list[i]->rec.data.chunk_was_revoked = 0;
6950                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6951                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6952                             data_list[i]->whoTo->flight_size,
6953                             data_list[i]->book_size,
6954                             (uintptr_t) data_list[i]->whoTo,
6955                             data_list[i]->rec.data.TSN_seq);
6956                 }
6957                 sctp_flight_size_increase(data_list[i]);
6958                 sctp_total_flight_increase(stcb, data_list[i]);
6959                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6960                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6961                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6962                 }
6963                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6964                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6965                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6966                         /* SWS sender side engages */
6967                         asoc->peers_rwnd = 0;
6968                 }
6969         }
6970         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6971                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6972         }
6973 }
6974
6975 static void
6976 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6977 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6978     SCTP_UNUSED
6979 #endif
6980 )
6981 {
6982         struct sctp_tmit_chunk *chk, *nchk;
6983
6984         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6985                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6986                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
6987                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
6988                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
6989                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
6990                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
6991                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
6992                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
6993                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
6994                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
6995                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
6996                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
6997                         /* Stray chunks must be cleaned up */
6998         clean_up_anyway:
6999                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7000                         if (chk->data) {
7001                                 sctp_m_freem(chk->data);
7002                                 chk->data = NULL;
7003                         }
7004                         asoc->ctrl_queue_cnt--;
7005                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7006                                 asoc->fwd_tsn_cnt--;
7007                         sctp_free_a_chunk(stcb, chk, so_locked);
7008                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7009                         /* special handling, we must look into the param */
7010                         if (chk != asoc->str_reset) {
7011                                 goto clean_up_anyway;
7012                         }
7013                 }
7014         }
7015 }
7016
7017
7018 static int
7019 sctp_can_we_split_this(struct sctp_tcb *stcb,
7020     uint32_t length,
7021     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7022 {
7023         /*
7024          * Make a decision on if I should split a msg into multiple parts.
7025          * This is only asked of incomplete messages.
7026          */
7027         if (eeor_on) {
7028                 /*
7029                  * If we are doing EEOR we need to always send it if its the
7030                  * entire thing, since it might be all the guy is putting in
7031                  * the hopper.
7032                  */
7033                 if (goal_mtu >= length) {
7034                         /*-
7035                          * If we have data outstanding,
7036                          * we get another chance when the sack
7037                          * arrives to transmit - wait for more data
7038                          */
7039                         if (stcb->asoc.total_flight == 0) {
7040                                 /*
7041                                  * If nothing is in flight, we zero the
7042                                  * packet counter.
7043                                  */
7044                                 return (length);
7045                         }
7046                         return (0);
7047
7048                 } else {
7049                         /* You can fill the rest */
7050                         return (goal_mtu);
7051                 }
7052         }
7053         /*-
7054          * For those strange folk that make the send buffer
7055          * smaller than our fragmentation point, we can't
7056          * get a full msg in so we have to allow splitting.
7057          */
7058         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7059                 return (length);
7060         }
7061         if ((length <= goal_mtu) ||
7062             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7063                 /* Sub-optimial residual don't split in non-eeor mode. */
7064                 return (0);
7065         }
7066         /*
7067          * If we reach here length is larger than the goal_mtu. Do we wish
7068          * to split it for the sake of packet putting together?
7069          */
7070         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7071                 /* Its ok to split it */
7072                 return (min(goal_mtu, frag_point));
7073         }
7074         /* Nope, can't split */
7075         return (0);
7076
7077 }
7078
7079 static uint32_t
7080 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7081     struct sctp_stream_out *strq,
7082     uint32_t goal_mtu,
7083     uint32_t frag_point,
7084     int *locked,
7085     int *giveup,
7086     int eeor_mode,
7087     int *bail,
7088     int so_locked
7089 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7090     SCTP_UNUSED
7091 #endif
7092 )
7093 {
7094         /* Move from the stream to the send_queue keeping track of the total */
7095         struct sctp_association *asoc;
7096         struct sctp_stream_queue_pending *sp;
7097         struct sctp_tmit_chunk *chk;
7098         struct sctp_data_chunk *dchkh;
7099         uint32_t to_move, length;
7100         uint8_t rcv_flags = 0;
7101         uint8_t some_taken;
7102         uint8_t send_lock_up = 0;
7103
7104         SCTP_TCB_LOCK_ASSERT(stcb);
7105         asoc = &stcb->asoc;
7106 one_more_time:
7107         /* sa_ignore FREED_MEMORY */
7108         sp = TAILQ_FIRST(&strq->outqueue);
7109         if (sp == NULL) {
7110                 *locked = 0;
7111                 if (send_lock_up == 0) {
7112                         SCTP_TCB_SEND_LOCK(stcb);
7113                         send_lock_up = 1;
7114                 }
7115                 sp = TAILQ_FIRST(&strq->outqueue);
7116                 if (sp) {
7117                         goto one_more_time;
7118                 }
7119                 if (strq->last_msg_incomplete) {
7120                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7121                             strq->stream_no,
7122                             strq->last_msg_incomplete);
7123                         strq->last_msg_incomplete = 0;
7124                 }
7125                 to_move = 0;
7126                 if (send_lock_up) {
7127                         SCTP_TCB_SEND_UNLOCK(stcb);
7128                         send_lock_up = 0;
7129                 }
7130                 goto out_of;
7131         }
7132         if ((sp->msg_is_complete) && (sp->length == 0)) {
7133                 if (sp->sender_all_done) {
7134                         /*
7135                          * We are doing differed cleanup. Last time through
7136                          * when we took all the data the sender_all_done was
7137                          * not set.
7138                          */
7139                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7140                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7141                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7142                                     sp->sender_all_done,
7143                                     sp->length,
7144                                     sp->msg_is_complete,
7145                                     sp->put_last_out,
7146                                     send_lock_up);
7147                         }
7148                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7149                                 SCTP_TCB_SEND_LOCK(stcb);
7150                                 send_lock_up = 1;
7151                         }
7152                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7153                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7154                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7155                         if (sp->net) {
7156                                 sctp_free_remote_addr(sp->net);
7157                                 sp->net = NULL;
7158                         }
7159                         if (sp->data) {
7160                                 sctp_m_freem(sp->data);
7161                                 sp->data = NULL;
7162                         }
7163                         sctp_free_a_strmoq(stcb, sp, so_locked);
7164                         /* we can't be locked to it */
7165                         *locked = 0;
7166                         stcb->asoc.locked_on_sending = NULL;
7167                         if (send_lock_up) {
7168                                 SCTP_TCB_SEND_UNLOCK(stcb);
7169                                 send_lock_up = 0;
7170                         }
7171                         /* back to get the next msg */
7172                         goto one_more_time;
7173                 } else {
7174                         /*
7175                          * sender just finished this but still holds a
7176                          * reference
7177                          */
7178                         *locked = 1;
7179                         *giveup = 1;
7180                         to_move = 0;
7181                         goto out_of;
7182                 }
7183         } else {
7184                 /* is there some to get */
7185                 if (sp->length == 0) {
7186                         /* no */
7187                         *locked = 1;
7188                         *giveup = 1;
7189                         to_move = 0;
7190                         goto out_of;
7191                 } else if (sp->discard_rest) {
7192                         if (send_lock_up == 0) {
7193                                 SCTP_TCB_SEND_LOCK(stcb);
7194                                 send_lock_up = 1;
7195                         }
7196                         /* Whack down the size */
7197                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7198                         if ((stcb->sctp_socket != NULL) && \
7199                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7200                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7201                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7202                         }
7203                         if (sp->data) {
7204                                 sctp_m_freem(sp->data);
7205                                 sp->data = NULL;
7206                                 sp->tail_mbuf = NULL;
7207                         }
7208                         sp->length = 0;
7209                         sp->some_taken = 1;
7210                         *locked = 1;
7211                         *giveup = 1;
7212                         to_move = 0;
7213                         goto out_of;
7214                 }
7215         }
7216         some_taken = sp->some_taken;
7217         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7218                 sp->msg_is_complete = 1;
7219         }
7220 re_look:
7221         length = sp->length;
7222         if (sp->msg_is_complete) {
7223                 /* The message is complete */
7224                 to_move = min(length, frag_point);
7225                 if (to_move == length) {
7226                         /* All of it fits in the MTU */
7227                         if (sp->some_taken) {
7228                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7229                                 sp->put_last_out = 1;
7230                         } else {
7231                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7232                                 sp->put_last_out = 1;
7233                         }
7234                 } else {
7235                         /* Not all of it fits, we fragment */
7236                         if (sp->some_taken == 0) {
7237                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7238                         }
7239                         sp->some_taken = 1;
7240                 }
7241         } else {
7242                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7243                 if (to_move) {
7244                         /*-
7245                          * We use a snapshot of length in case it
7246                          * is expanding during the compare.
7247                          */
7248                         uint32_t llen;
7249
7250                         llen = length;
7251                         if (to_move >= llen) {
7252                                 to_move = llen;
7253                                 if (send_lock_up == 0) {
7254                                         /*-
7255                                          * We are taking all of an incomplete msg
7256                                          * thus we need a send lock.
7257                                          */
7258                                         SCTP_TCB_SEND_LOCK(stcb);
7259                                         send_lock_up = 1;
7260                                         if (sp->msg_is_complete) {
7261                                                 /*
7262                                                  * the sender finished the
7263                                                  * msg
7264                                                  */
7265                                                 goto re_look;
7266                                         }
7267                                 }
7268                         }
7269                         if (sp->some_taken == 0) {
7270                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7271                                 sp->some_taken = 1;
7272                         }
7273                 } else {
7274                         /* Nothing to take. */
7275                         if (sp->some_taken) {
7276                                 *locked = 1;
7277                         }
7278                         *giveup = 1;
7279                         to_move = 0;
7280                         goto out_of;
7281                 }
7282         }
7283
7284         /* If we reach here, we can copy out a chunk */
7285         sctp_alloc_a_chunk(stcb, chk);
7286         if (chk == NULL) {
7287                 /* No chunk memory */
7288                 *giveup = 1;
7289                 to_move = 0;
7290                 goto out_of;
7291         }
7292         /*
7293          * Setup for unordered if needed by looking at the user sent info
7294          * flags.
7295          */
7296         if (sp->sinfo_flags & SCTP_UNORDERED) {
7297                 rcv_flags |= SCTP_DATA_UNORDERED;
7298         }
7299         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7300             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7301                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7302         }
7303         /* clear out the chunk before setting up */
7304         memset(chk, 0, sizeof(*chk));
7305         chk->rec.data.rcv_flags = rcv_flags;
7306
7307         if (to_move >= length) {
7308                 /* we think we can steal the whole thing */
7309                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7310                         SCTP_TCB_SEND_LOCK(stcb);
7311                         send_lock_up = 1;
7312                 }
7313                 if (to_move < sp->length) {
7314                         /* bail, it changed */
7315                         goto dont_do_it;
7316                 }
7317                 chk->data = sp->data;
7318                 chk->last_mbuf = sp->tail_mbuf;
7319                 /* register the stealing */
7320                 sp->data = sp->tail_mbuf = NULL;
7321         } else {
7322                 struct mbuf *m;
7323
7324 dont_do_it:
7325                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7326                 chk->last_mbuf = NULL;
7327                 if (chk->data == NULL) {
7328                         sp->some_taken = some_taken;
7329                         sctp_free_a_chunk(stcb, chk, so_locked);
7330                         *bail = 1;
7331                         to_move = 0;
7332                         goto out_of;
7333                 }
7334 #ifdef SCTP_MBUF_LOGGING
7335                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7336                         struct mbuf *mat;
7337
7338                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7339                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7340                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7341                                 }
7342                         }
7343                 }
7344 #endif
7345                 /* Pull off the data */
7346                 m_adj(sp->data, to_move);
7347                 /* Now lets work our way down and compact it */
7348                 m = sp->data;
7349                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7350                         sp->data = SCTP_BUF_NEXT(m);
7351                         SCTP_BUF_NEXT(m) = NULL;
7352                         if (sp->tail_mbuf == m) {
7353                                 /*-
7354                                  * Freeing tail? TSNH since
7355                                  * we supposedly were taking less
7356                                  * than the sp->length.
7357                                  */
7358 #ifdef INVARIANTS
7359                                 panic("Huh, freing tail? - TSNH");
7360 #else
7361                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7362                                 sp->tail_mbuf = sp->data = NULL;
7363                                 sp->length = 0;
7364 #endif
7365
7366                         }
7367                         sctp_m_free(m);
7368                         m = sp->data;
7369                 }
7370         }
7371         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7372                 chk->copy_by_ref = 1;
7373         } else {
7374                 chk->copy_by_ref = 0;
7375         }
7376         /*
7377          * get last_mbuf and counts of mb useage This is ugly but hopefully
7378          * its only one mbuf.
7379          */
7380         if (chk->last_mbuf == NULL) {
7381                 chk->last_mbuf = chk->data;
7382                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7383                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7384                 }
7385         }
7386         if (to_move > length) {
7387                 /*- This should not happen either
7388                  * since we always lower to_move to the size
7389                  * of sp->length if its larger.
7390                  */
7391 #ifdef INVARIANTS
7392                 panic("Huh, how can to_move be larger?");
7393 #else
7394                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7395                 sp->length = 0;
7396 #endif
7397         } else {
7398                 atomic_subtract_int(&sp->length, to_move);
7399         }
7400         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7401                 /* Not enough room for a chunk header, get some */
7402                 struct mbuf *m;
7403
7404                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7405                 if (m == NULL) {
7406                         /*
7407                          * we're in trouble here. _PREPEND below will free
7408                          * all the data if there is no leading space, so we
7409                          * must put the data back and restore.
7410                          */
7411                         if (send_lock_up == 0) {
7412                                 SCTP_TCB_SEND_LOCK(stcb);
7413                                 send_lock_up = 1;
7414                         }
7415                         if (chk->data == NULL) {
7416                                 /* unsteal the data */
7417                                 sp->data = chk->data;
7418                                 sp->tail_mbuf = chk->last_mbuf;
7419                         } else {
7420                                 struct mbuf *m_tmp;
7421
7422                                 /* reassemble the data */
7423                                 m_tmp = sp->data;
7424                                 sp->data = chk->data;
7425                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7426                         }
7427                         sp->some_taken = some_taken;
7428                         atomic_add_int(&sp->length, to_move);
7429                         chk->data = NULL;
7430                         *bail = 1;
7431                         sctp_free_a_chunk(stcb, chk, so_locked);
7432                         to_move = 0;
7433                         goto out_of;
7434                 } else {
7435                         SCTP_BUF_LEN(m) = 0;
7436                         SCTP_BUF_NEXT(m) = chk->data;
7437                         chk->data = m;
7438                         M_ALIGN(chk->data, 4);
7439                 }
7440         }
7441         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7442         if (chk->data == NULL) {
7443                 /* HELP, TSNH since we assured it would not above? */
7444 #ifdef INVARIANTS
7445                 panic("prepend failes HELP?");
7446 #else
7447                 SCTP_PRINTF("prepend fails HELP?\n");
7448                 sctp_free_a_chunk(stcb, chk, so_locked);
7449 #endif
7450                 *bail = 1;
7451                 to_move = 0;
7452                 goto out_of;
7453         }
7454         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7455         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7456         chk->book_size_scale = 0;
7457         chk->sent = SCTP_DATAGRAM_UNSENT;
7458
7459         chk->flags = 0;
7460         chk->asoc = &stcb->asoc;
7461         chk->pad_inplace = 0;
7462         chk->no_fr_allowed = 0;
7463         chk->rec.data.stream_seq = sp->strseq;
7464         chk->rec.data.stream_number = sp->stream;
7465         chk->rec.data.payloadtype = sp->ppid;
7466         chk->rec.data.context = sp->context;
7467         chk->rec.data.doing_fast_retransmit = 0;
7468
7469         chk->rec.data.timetodrop = sp->ts;
7470         chk->flags = sp->act_flags;
7471
7472         if (sp->net) {
7473                 chk->whoTo = sp->net;
7474                 atomic_add_int(&chk->whoTo->ref_count, 1);
7475         } else
7476                 chk->whoTo = NULL;
7477
7478         if (sp->holds_key_ref) {
7479                 chk->auth_keyid = sp->auth_keyid;
7480                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7481                 chk->holds_key_ref = 1;
7482         }
7483         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7484         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7485                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7486                     (uintptr_t) stcb, sp->length,
7487                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7488                     chk->rec.data.TSN_seq);
7489         }
7490         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7491         /*
7492          * Put the rest of the things in place now. Size was done earlier in
7493          * previous loop prior to padding.
7494          */
7495
7496 #ifdef SCTP_ASOCLOG_OF_TSNS
7497         SCTP_TCB_LOCK_ASSERT(stcb);
7498         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7499                 asoc->tsn_out_at = 0;
7500                 asoc->tsn_out_wrapped = 1;
7501         }
7502         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7503         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7504         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7505         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7506         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7507         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7508         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7509         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7510         asoc->tsn_out_at++;
7511 #endif
7512
7513         dchkh->ch.chunk_type = SCTP_DATA;
7514         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7515         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7516         dchkh->dp.stream_id = htons(strq->stream_no);
7517         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7518         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7519         dchkh->ch.chunk_length = htons(chk->send_size);
7520         /* Now advance the chk->send_size by the actual pad needed. */
7521         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7522                 /* need a pad */
7523                 struct mbuf *lm;
7524                 int pads;
7525
7526                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7527                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7528                         chk->pad_inplace = 1;
7529                 }
7530                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7531                         /* pad added an mbuf */
7532                         chk->last_mbuf = lm;
7533                 }
7534                 chk->send_size += pads;
7535         }
7536         /* We only re-set the policy if it is on */
7537         if (sp->pr_sctp_on) {
7538                 sctp_set_prsctp_policy(sp);
7539                 asoc->pr_sctp_cnt++;
7540                 chk->pr_sctp_on = 1;
7541         } else {
7542                 chk->pr_sctp_on = 0;
7543         }
7544         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7545                 /* All done pull and kill the message */
7546                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7547                 if (sp->put_last_out == 0) {
7548                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7549                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7550                             sp->sender_all_done,
7551                             sp->length,
7552                             sp->msg_is_complete,
7553                             sp->put_last_out,
7554                             send_lock_up);
7555                 }
7556                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7557                         SCTP_TCB_SEND_LOCK(stcb);
7558                         send_lock_up = 1;
7559                 }
7560                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7561                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7562                 if (sp->net) {
7563                         sctp_free_remote_addr(sp->net);
7564                         sp->net = NULL;
7565                 }
7566                 if (sp->data) {
7567                         sctp_m_freem(sp->data);
7568                         sp->data = NULL;
7569                 }
7570                 sctp_free_a_strmoq(stcb, sp, so_locked);
7571
7572                 /* we can't be locked to it */
7573                 *locked = 0;
7574                 stcb->asoc.locked_on_sending = NULL;
7575         } else {
7576                 /* more to go, we are locked */
7577                 *locked = 1;
7578         }
7579         asoc->chunks_on_out_queue++;
7580         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7581         asoc->send_queue_cnt++;
7582 out_of:
7583         if (send_lock_up) {
7584                 SCTP_TCB_SEND_UNLOCK(stcb);
7585         }
7586         return (to_move);
7587 }
7588
7589
7590 static void
7591 sctp_fill_outqueue(struct sctp_tcb *stcb,
7592     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7593 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7594     SCTP_UNUSED
7595 #endif
7596 )
7597 {
7598         struct sctp_association *asoc;
7599         struct sctp_stream_out *strq;
7600         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7601         int locked, giveup;
7602
7603         SCTP_TCB_LOCK_ASSERT(stcb);
7604         asoc = &stcb->asoc;
7605         switch (net->ro._l_addr.sa.sa_family) {
7606 #ifdef INET
7607         case AF_INET:
7608                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7609                 break;
7610 #endif
7611 #ifdef INET6
7612         case AF_INET6:
7613                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7614                 break;
7615 #endif
7616         default:
7617                 /* TSNH */
7618                 goal_mtu = net->mtu;
7619                 break;
7620         }
7621         /* Need an allowance for the data chunk header too */
7622         goal_mtu -= sizeof(struct sctp_data_chunk);
7623
7624         /* must make even word boundary */
7625         goal_mtu &= 0xfffffffc;
7626         if (asoc->locked_on_sending) {
7627                 /* We are stuck on one stream until the message completes. */
7628                 strq = asoc->locked_on_sending;
7629                 locked = 1;
7630         } else {
7631                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7632                 locked = 0;
7633         }
7634         while ((goal_mtu > 0) && strq) {
7635                 giveup = 0;
7636                 bail = 0;
7637                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7638                     &giveup, eeor_mode, &bail, so_locked);
7639                 if (moved_how_much)
7640                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7641
7642                 if (locked) {
7643                         asoc->locked_on_sending = strq;
7644                         if ((moved_how_much == 0) || (giveup) || bail)
7645                                 /* no more to move for now */
7646                                 break;
7647                 } else {
7648                         asoc->locked_on_sending = NULL;
7649                         if ((giveup) || bail) {
7650                                 break;
7651                         }
7652                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7653                         if (strq == NULL) {
7654                                 break;
7655                         }
7656                 }
7657                 total_moved += moved_how_much;
7658                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7659                 goal_mtu &= 0xfffffffc;
7660         }
7661         if (bail)
7662                 *quit_now = 1;
7663
7664         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7665
7666         if (total_moved == 0) {
7667                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7668                     (net == stcb->asoc.primary_destination)) {
7669                         /* ran dry for primary network net */
7670                         SCTP_STAT_INCR(sctps_primary_randry);
7671                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7672                         /* ran dry with CMT on */
7673                         SCTP_STAT_INCR(sctps_cmt_randry);
7674                 }
7675         }
7676 }
7677
7678 void
7679 sctp_fix_ecn_echo(struct sctp_association *asoc)
7680 {
7681         struct sctp_tmit_chunk *chk;
7682
7683         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7684                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7685                         chk->sent = SCTP_DATAGRAM_UNSENT;
7686                 }
7687         }
7688 }
7689
7690 void
7691 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7692 {
7693         struct sctp_association *asoc;
7694         struct sctp_tmit_chunk *chk;
7695         struct sctp_stream_queue_pending *sp;
7696         unsigned int i;
7697
7698         if (net == NULL) {
7699                 return;
7700         }
7701         asoc = &stcb->asoc;
7702         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7703                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7704                         if (sp->net == net) {
7705                                 sctp_free_remote_addr(sp->net);
7706                                 sp->net = NULL;
7707                         }
7708                 }
7709         }
7710         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7711                 if (chk->whoTo == net) {
7712                         sctp_free_remote_addr(chk->whoTo);
7713                         chk->whoTo = NULL;
7714                 }
7715         }
7716 }
7717
7718 int
7719 sctp_med_chunk_output(struct sctp_inpcb *inp,
7720     struct sctp_tcb *stcb,
7721     struct sctp_association *asoc,
7722     int *num_out,
7723     int *reason_code,
7724     int control_only, int from_where,
7725     struct timeval *now, int *now_filled, int frag_point, int so_locked
7726 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7727     SCTP_UNUSED
7728 #endif
7729 )
7730 {
7731         /*
7732          * Ok this is the generic chunk service queue. we must do the
7733          * following: - Service the stream queue that is next, moving any
7734          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7735          * LAST to the out queue in one pass) and assigning TSN's - Check to
7736          * see if the cwnd/rwnd allows any output, if so we go ahead and
7737          * fomulate and send the low level chunks. Making sure to combine
7738          * any control in the control chunk queue also.
7739          */
7740         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7741         struct mbuf *outchain, *endoutchain;
7742         struct sctp_tmit_chunk *chk, *nchk;
7743
7744         /* temp arrays for unlinking */
7745         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7746         int no_fragmentflg, error;
7747         unsigned int max_rwnd_per_dest, max_send_per_dest;
7748         int one_chunk, hbflag, skip_data_for_this_net;
7749         int asconf, cookie, no_out_cnt;
7750         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7751         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7752         int tsns_sent = 0;
7753         uint32_t auth_offset = 0;
7754         struct sctp_auth_chunk *auth = NULL;
7755         uint16_t auth_keyid;
7756         int override_ok = 1;
7757         int skip_fill_up = 0;
7758         int data_auth_reqd = 0;
7759
7760         /*
7761          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7762          * destination.
7763          */
7764         int quit_now = 0;
7765
7766         *num_out = 0;
7767         auth_keyid = stcb->asoc.authinfo.active_keyid;
7768
7769         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7770             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7771             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7772                 eeor_mode = 1;
7773         } else {
7774                 eeor_mode = 0;
7775         }
7776         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7777         /*
7778          * First lets prime the pump. For each destination, if there is room
7779          * in the flight size, attempt to pull an MTU's worth out of the
7780          * stream queues into the general send_queue
7781          */
7782 #ifdef SCTP_AUDITING_ENABLED
7783         sctp_audit_log(0xC2, 2);
7784 #endif
7785         SCTP_TCB_LOCK_ASSERT(stcb);
7786         hbflag = 0;
7787         if ((control_only) || (asoc->stream_reset_outstanding))
7788                 no_data_chunks = 1;
7789         else
7790                 no_data_chunks = 0;
7791
7792         /* Nothing to possible to send? */
7793         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7794             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7795             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7796             TAILQ_EMPTY(&asoc->send_queue) &&
7797             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7798 nothing_to_send:
7799                 *reason_code = 9;
7800                 return (0);
7801         }
7802         if (asoc->peers_rwnd == 0) {
7803                 /* No room in peers rwnd */
7804                 *reason_code = 1;
7805                 if (asoc->total_flight > 0) {
7806                         /* we are allowed one chunk in flight */
7807                         no_data_chunks = 1;
7808                 }
7809         }
7810         if (stcb->asoc.ecn_echo_cnt_onq) {
7811                 /* Record where a sack goes, if any */
7812                 if (no_data_chunks &&
7813                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7814                         /* Nothing but ECNe to send - we don't do that */
7815                         goto nothing_to_send;
7816                 }
7817                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7818                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7819                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7820                                 sack_goes_to = chk->whoTo;
7821                                 break;
7822                         }
7823                 }
7824         }
7825         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7826         if (stcb->sctp_socket)
7827                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7828         else
7829                 max_send_per_dest = 0;
7830         if (no_data_chunks == 0) {
7831                 /* How many non-directed chunks are there? */
7832                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7833                         if (chk->whoTo == NULL) {
7834                                 /*
7835                                  * We already have non-directed chunks on
7836                                  * the queue, no need to do a fill-up.
7837                                  */
7838                                 skip_fill_up = 1;
7839                                 break;
7840                         }
7841                 }
7842
7843         }
7844         if ((no_data_chunks == 0) &&
7845             (skip_fill_up == 0) &&
7846             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7847                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7848                         /*
7849                          * This for loop we are in takes in each net, if
7850                          * its's got space in cwnd and has data sent to it
7851                          * (when CMT is off) then it calls
7852                          * sctp_fill_outqueue for the net. This gets data on
7853                          * the send queue for that network.
7854                          *
7855                          * In sctp_fill_outqueue TSN's are assigned and data is
7856                          * copied out of the stream buffers. Note mostly
7857                          * copy by reference (we hope).
7858                          */
7859                         net->window_probe = 0;
7860                         if ((net != stcb->asoc.alternate) &&
7861                             ((net->dest_state & SCTP_ADDR_PF) ||
7862                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7863                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7864                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7865                                         sctp_log_cwnd(stcb, net, 1,
7866                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7867                                 }
7868                                 continue;
7869                         }
7870                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7871                             (net->flight_size == 0)) {
7872                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7873                         }
7874                         if (net->flight_size >= net->cwnd) {
7875                                 /* skip this network, no room - can't fill */
7876                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7877                                         sctp_log_cwnd(stcb, net, 3,
7878                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7879                                 }
7880                                 continue;
7881                         }
7882                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7883                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7884                         }
7885                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7886                         if (quit_now) {
7887                                 /* memory alloc failure */
7888                                 no_data_chunks = 1;
7889                                 break;
7890                         }
7891                 }
7892         }
7893         /* now service each destination and send out what we can for it */
7894         /* Nothing to send? */
7895         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7896             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7897             TAILQ_EMPTY(&asoc->send_queue)) {
7898                 *reason_code = 8;
7899                 return (0);
7900         }
7901         if (asoc->sctp_cmt_on_off > 0) {
7902                 /* get the last start point */
7903                 start_at = asoc->last_net_cmt_send_started;
7904                 if (start_at == NULL) {
7905                         /* null so to beginning */
7906                         start_at = TAILQ_FIRST(&asoc->nets);
7907                 } else {
7908                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7909                         if (start_at == NULL) {
7910                                 start_at = TAILQ_FIRST(&asoc->nets);
7911                         }
7912                 }
7913                 asoc->last_net_cmt_send_started = start_at;
7914         } else {
7915                 start_at = TAILQ_FIRST(&asoc->nets);
7916         }
7917         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7918                 if (chk->whoTo == NULL) {
7919                         if (asoc->alternate) {
7920                                 chk->whoTo = asoc->alternate;
7921                         } else {
7922                                 chk->whoTo = asoc->primary_destination;
7923                         }
7924                         atomic_add_int(&chk->whoTo->ref_count, 1);
7925                 }
7926         }
7927         old_start_at = NULL;
7928 again_one_more_time:
7929         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7930                 /* how much can we send? */
7931                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7932                 if (old_start_at && (old_start_at == net)) {
7933                         /* through list ocmpletely. */
7934                         break;
7935                 }
7936                 tsns_sent = 0xa;
7937                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7938                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7939                     (net->flight_size >= net->cwnd)) {
7940                         /*
7941                          * Nothing on control or asconf and flight is full,
7942                          * we can skip even in the CMT case.
7943                          */
7944                         continue;
7945                 }
7946                 bundle_at = 0;
7947                 endoutchain = outchain = NULL;
7948                 no_fragmentflg = 1;
7949                 one_chunk = 0;
7950                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7951                         skip_data_for_this_net = 1;
7952                 } else {
7953                         skip_data_for_this_net = 0;
7954                 }
7955                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7956                         /*
7957                          * if we have a route and an ifp check to see if we
7958                          * have room to send to this guy
7959                          */
7960                         struct ifnet *ifp;
7961
7962                         ifp = net->ro.ro_rt->rt_ifp;
7963                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7964                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7965                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7966                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7967                                 }
7968                                 continue;
7969                         }
7970                 }
7971                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7972 #ifdef INET
7973                 case AF_INET:
7974                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7975                         break;
7976 #endif
7977 #ifdef INET6
7978                 case AF_INET6:
7979                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7980                         break;
7981 #endif
7982                 default:
7983                         /* TSNH */
7984                         mtu = net->mtu;
7985                         break;
7986                 }
7987                 mx_mtu = mtu;
7988                 to_out = 0;
7989                 if (mtu > asoc->peers_rwnd) {
7990                         if (asoc->total_flight > 0) {
7991                                 /* We have a packet in flight somewhere */
7992                                 r_mtu = asoc->peers_rwnd;
7993                         } else {
7994                                 /* We are always allowed to send one MTU out */
7995                                 one_chunk = 1;
7996                                 r_mtu = mtu;
7997                         }
7998                 } else {
7999                         r_mtu = mtu;
8000                 }
8001                 /************************/
8002                 /* ASCONF transmission */
8003                 /************************/
8004                 /* Now first lets go through the asconf queue */
8005                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8006                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8007                                 continue;
8008                         }
8009                         if (chk->whoTo == NULL) {
8010                                 if (asoc->alternate == NULL) {
8011                                         if (asoc->primary_destination != net) {
8012                                                 break;
8013                                         }
8014                                 } else {
8015                                         if (asoc->alternate != net) {
8016                                                 break;
8017                                         }
8018                                 }
8019                         } else {
8020                                 if (chk->whoTo != net) {
8021                                         break;
8022                                 }
8023                         }
8024                         if (chk->data == NULL) {
8025                                 break;
8026                         }
8027                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8028                             chk->sent != SCTP_DATAGRAM_RESEND) {
8029                                 break;
8030                         }
8031                         /*
8032                          * if no AUTH is yet included and this chunk
8033                          * requires it, make sure to account for it.  We
8034                          * don't apply the size until the AUTH chunk is
8035                          * actually added below in case there is no room for
8036                          * this chunk. NOTE: we overload the use of "omtu"
8037                          * here
8038                          */
8039                         if ((auth == NULL) &&
8040                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8041                             stcb->asoc.peer_auth_chunks)) {
8042                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8043                         } else
8044                                 omtu = 0;
8045                         /* Here we do NOT factor the r_mtu */
8046                         if ((chk->send_size < (int)(mtu - omtu)) ||
8047                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8048                                 /*
8049                                  * We probably should glom the mbuf chain
8050                                  * from the chk->data for control but the
8051                                  * problem is it becomes yet one more level
8052                                  * of tracking to do if for some reason
8053                                  * output fails. Then I have got to
8054                                  * reconstruct the merged control chain.. el
8055                                  * yucko.. for now we take the easy way and
8056                                  * do the copy
8057                                  */
8058                                 /*
8059                                  * Add an AUTH chunk, if chunk requires it
8060                                  * save the offset into the chain for AUTH
8061                                  */
8062                                 if ((auth == NULL) &&
8063                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8064                                     stcb->asoc.peer_auth_chunks))) {
8065                                         outchain = sctp_add_auth_chunk(outchain,
8066                                             &endoutchain,
8067                                             &auth,
8068                                             &auth_offset,
8069                                             stcb,
8070                                             chk->rec.chunk_id.id);
8071                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8072                                 }
8073                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8074                                     (int)chk->rec.chunk_id.can_take_data,
8075                                     chk->send_size, chk->copy_by_ref);
8076                                 if (outchain == NULL) {
8077                                         *reason_code = 8;
8078                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8079                                         return (ENOMEM);
8080                                 }
8081                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8082                                 /* update our MTU size */
8083                                 if (mtu > (chk->send_size + omtu))
8084                                         mtu -= (chk->send_size + omtu);
8085                                 else
8086                                         mtu = 0;
8087                                 to_out += (chk->send_size + omtu);
8088                                 /* Do clear IP_DF ? */
8089                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8090                                         no_fragmentflg = 0;
8091                                 }
8092                                 if (chk->rec.chunk_id.can_take_data)
8093                                         chk->data = NULL;
8094                                 /*
8095                                  * set hb flag since we can use these for
8096                                  * RTO
8097                                  */
8098                                 hbflag = 1;
8099                                 asconf = 1;
8100                                 /*
8101                                  * should sysctl this: don't bundle data
8102                                  * with ASCONF since it requires AUTH
8103                                  */
8104                                 no_data_chunks = 1;
8105                                 chk->sent = SCTP_DATAGRAM_SENT;
8106                                 if (chk->whoTo == NULL) {
8107                                         chk->whoTo = net;
8108                                         atomic_add_int(&net->ref_count, 1);
8109                                 }
8110                                 chk->snd_count++;
8111                                 if (mtu == 0) {
8112                                         /*
8113                                          * Ok we are out of room but we can
8114                                          * output without effecting the
8115                                          * flight size since this little guy
8116                                          * is a control only packet.
8117                                          */
8118                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8119                                         /*
8120                                          * do NOT clear the asconf flag as
8121                                          * it is used to do appropriate
8122                                          * source address selection.
8123                                          */
8124                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8125                                             (struct sockaddr *)&net->ro._l_addr,
8126                                             outchain, auth_offset, auth,
8127                                             stcb->asoc.authinfo.active_keyid,
8128                                             no_fragmentflg, 0, asconf,
8129                                             inp->sctp_lport, stcb->rport,
8130                                             htonl(stcb->asoc.peer_vtag),
8131                                             net->port, NULL,
8132                                             0, 0,
8133                                             so_locked))) {
8134                                                 if (error == ENOBUFS) {
8135                                                         asoc->ifp_had_enobuf = 1;
8136                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8137                                                 }
8138                                                 if (from_where == 0) {
8139                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8140                                                 }
8141                                                 if (*now_filled == 0) {
8142                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8143                                                         *now_filled = 1;
8144                                                         *now = net->last_sent_time;
8145                                                 } else {
8146                                                         net->last_sent_time = *now;
8147                                                 }
8148                                                 hbflag = 0;
8149                                                 /* error, could not output */
8150                                                 if (error == EHOSTUNREACH) {
8151                                                         /*
8152                                                          * Destination went
8153                                                          * unreachable
8154                                                          * during this send
8155                                                          */
8156                                                         sctp_move_chunks_from_net(stcb, net);
8157                                                 }
8158                                                 *reason_code = 7;
8159                                                 continue;
8160                                         } else
8161                                                 asoc->ifp_had_enobuf = 0;
8162                                         if (*now_filled == 0) {
8163                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8164                                                 *now_filled = 1;
8165                                                 *now = net->last_sent_time;
8166                                         } else {
8167                                                 net->last_sent_time = *now;
8168                                         }
8169                                         hbflag = 0;
8170                                         /*
8171                                          * increase the number we sent, if a
8172                                          * cookie is sent we don't tell them
8173                                          * any was sent out.
8174                                          */
8175                                         outchain = endoutchain = NULL;
8176                                         auth = NULL;
8177                                         auth_offset = 0;
8178                                         if (!no_out_cnt)
8179                                                 *num_out += ctl_cnt;
8180                                         /* recalc a clean slate and setup */
8181                                         switch (net->ro._l_addr.sa.sa_family) {
8182 #ifdef INET
8183                                         case AF_INET:
8184                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8185                                                 break;
8186 #endif
8187 #ifdef INET6
8188                                         case AF_INET6:
8189                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8190                                                 break;
8191 #endif
8192                                         default:
8193                                                 /* TSNH */
8194                                                 mtu = net->mtu;
8195                                                 break;
8196                                         }
8197                                         to_out = 0;
8198                                         no_fragmentflg = 1;
8199                                 }
8200                         }
8201                 }
8202                 /************************/
8203                 /* Control transmission */
8204                 /************************/
8205                 /* Now first lets go through the control queue */
8206                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8207                         if ((sack_goes_to) &&
8208                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8209                             (chk->whoTo != sack_goes_to)) {
8210                                 /*
8211                                  * if we have a sack in queue, and we are
8212                                  * looking at an ecn echo that is NOT queued
8213                                  * to where the sack is going..
8214                                  */
8215                                 if (chk->whoTo == net) {
8216                                         /*
8217                                          * Don't transmit it to where its
8218                                          * going (current net)
8219                                          */
8220                                         continue;
8221                                 } else if (sack_goes_to == net) {
8222                                         /*
8223                                          * But do transmit it to this
8224                                          * address
8225                                          */
8226                                         goto skip_net_check;
8227                                 }
8228                         }
8229                         if (chk->whoTo == NULL) {
8230                                 if (asoc->alternate == NULL) {
8231                                         if (asoc->primary_destination != net) {
8232                                                 continue;
8233                                         }
8234                                 } else {
8235                                         if (asoc->alternate != net) {
8236                                                 continue;
8237                                         }
8238                                 }
8239                         } else {
8240                                 if (chk->whoTo != net) {
8241                                         continue;
8242                                 }
8243                         }
8244         skip_net_check:
8245                         if (chk->data == NULL) {
8246                                 continue;
8247                         }
8248                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8249                                 /*
8250                                  * It must be unsent. Cookies and ASCONF's
8251                                  * hang around but there timers will force
8252                                  * when marked for resend.
8253                                  */
8254                                 continue;
8255                         }
8256                         /*
8257                          * if no AUTH is yet included and this chunk
8258                          * requires it, make sure to account for it.  We
8259                          * don't apply the size until the AUTH chunk is
8260                          * actually added below in case there is no room for
8261                          * this chunk. NOTE: we overload the use of "omtu"
8262                          * here
8263                          */
8264                         if ((auth == NULL) &&
8265                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8266                             stcb->asoc.peer_auth_chunks)) {
8267                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8268                         } else
8269                                 omtu = 0;
8270                         /* Here we do NOT factor the r_mtu */
8271                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8272                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8273                                 /*
8274                                  * We probably should glom the mbuf chain
8275                                  * from the chk->data for control but the
8276                                  * problem is it becomes yet one more level
8277                                  * of tracking to do if for some reason
8278                                  * output fails. Then I have got to
8279                                  * reconstruct the merged control chain.. el
8280                                  * yucko.. for now we take the easy way and
8281                                  * do the copy
8282                                  */
8283                                 /*
8284                                  * Add an AUTH chunk, if chunk requires it
8285                                  * save the offset into the chain for AUTH
8286                                  */
8287                                 if ((auth == NULL) &&
8288                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8289                                     stcb->asoc.peer_auth_chunks))) {
8290                                         outchain = sctp_add_auth_chunk(outchain,
8291                                             &endoutchain,
8292                                             &auth,
8293                                             &auth_offset,
8294                                             stcb,
8295                                             chk->rec.chunk_id.id);
8296                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8297                                 }
8298                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8299                                     (int)chk->rec.chunk_id.can_take_data,
8300                                     chk->send_size, chk->copy_by_ref);
8301                                 if (outchain == NULL) {
8302                                         *reason_code = 8;
8303                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8304                                         return (ENOMEM);
8305                                 }
8306                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8307                                 /* update our MTU size */
8308                                 if (mtu > (chk->send_size + omtu))
8309                                         mtu -= (chk->send_size + omtu);
8310                                 else
8311                                         mtu = 0;
8312                                 to_out += (chk->send_size + omtu);
8313                                 /* Do clear IP_DF ? */
8314                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8315                                         no_fragmentflg = 0;
8316                                 }
8317                                 if (chk->rec.chunk_id.can_take_data)
8318                                         chk->data = NULL;
8319                                 /* Mark things to be removed, if needed */
8320                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8321                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8322                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8323                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8324                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8325                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8326                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8327                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8328                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8329                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8330                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8331                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8332                                                 hbflag = 1;
8333                                         }
8334                                         /* remove these chunks at the end */
8335                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8336                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8337                                                 /* turn off the timer */
8338                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8339                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8340                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8341                                                 }
8342                                         }
8343                                         ctl_cnt++;
8344                                 } else {
8345                                         /*
8346                                          * Other chunks, since they have
8347                                          * timers running (i.e. COOKIE) we
8348                                          * just "trust" that it gets sent or
8349                                          * retransmitted.
8350                                          */
8351                                         ctl_cnt++;
8352                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8353                                                 cookie = 1;
8354                                                 no_out_cnt = 1;
8355                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8356                                                 /*
8357                                                  * Increment ecne send count
8358                                                  * here this means we may be
8359                                                  * over-zealous in our
8360                                                  * counting if the send
8361                                                  * fails, but its the best
8362                                                  * place to do it (we used
8363                                                  * to do it in the queue of
8364                                                  * the chunk, but that did
8365                                                  * not tell how many times
8366                                                  * it was sent.
8367                                                  */
8368                                                 SCTP_STAT_INCR(sctps_sendecne);
8369                                         }
8370                                         chk->sent = SCTP_DATAGRAM_SENT;
8371                                         if (chk->whoTo == NULL) {
8372                                                 chk->whoTo = net;
8373                                                 atomic_add_int(&net->ref_count, 1);
8374                                         }
8375                                         chk->snd_count++;
8376                                 }
8377                                 if (mtu == 0) {
8378                                         /*
8379                                          * Ok we are out of room but we can
8380                                          * output without effecting the
8381                                          * flight size since this little guy
8382                                          * is a control only packet.
8383                                          */
8384                                         if (asconf) {
8385                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8386                                                 /*
8387                                                  * do NOT clear the asconf
8388                                                  * flag as it is used to do
8389                                                  * appropriate source
8390                                                  * address selection.
8391                                                  */
8392                                         }
8393                                         if (cookie) {
8394                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8395                                                 cookie = 0;
8396                                         }
8397                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8398                                             (struct sockaddr *)&net->ro._l_addr,
8399                                             outchain,
8400                                             auth_offset, auth,
8401                                             stcb->asoc.authinfo.active_keyid,
8402                                             no_fragmentflg, 0, asconf,
8403                                             inp->sctp_lport, stcb->rport,
8404                                             htonl(stcb->asoc.peer_vtag),
8405                                             net->port, NULL,
8406                                             0, 0,
8407                                             so_locked))) {
8408                                                 if (error == ENOBUFS) {
8409                                                         asoc->ifp_had_enobuf = 1;
8410                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8411                                                 }
8412                                                 if (from_where == 0) {
8413                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8414                                                 }
8415                                                 /* error, could not output */
8416                                                 if (hbflag) {
8417                                                         if (*now_filled == 0) {
8418                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8419                                                                 *now_filled = 1;
8420                                                                 *now = net->last_sent_time;
8421                                                         } else {
8422                                                                 net->last_sent_time = *now;
8423                                                         }
8424                                                         hbflag = 0;
8425                                                 }
8426                                                 if (error == EHOSTUNREACH) {
8427                                                         /*
8428                                                          * Destination went
8429                                                          * unreachable
8430                                                          * during this send
8431                                                          */
8432                                                         sctp_move_chunks_from_net(stcb, net);
8433                                                 }
8434                                                 *reason_code = 7;
8435                                                 continue;
8436                                         } else
8437                                                 asoc->ifp_had_enobuf = 0;
8438                                         /* Only HB or ASCONF advances time */
8439                                         if (hbflag) {
8440                                                 if (*now_filled == 0) {
8441                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8442                                                         *now_filled = 1;
8443                                                         *now = net->last_sent_time;
8444                                                 } else {
8445                                                         net->last_sent_time = *now;
8446                                                 }
8447                                                 hbflag = 0;
8448                                         }
8449                                         /*
8450                                          * increase the number we sent, if a
8451                                          * cookie is sent we don't tell them
8452                                          * any was sent out.
8453                                          */
8454                                         outchain = endoutchain = NULL;
8455                                         auth = NULL;
8456                                         auth_offset = 0;
8457                                         if (!no_out_cnt)
8458                                                 *num_out += ctl_cnt;
8459                                         /* recalc a clean slate and setup */
8460                                         switch (net->ro._l_addr.sa.sa_family) {
8461 #ifdef INET
8462                                         case AF_INET:
8463                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8464                                                 break;
8465 #endif
8466 #ifdef INET6
8467                                         case AF_INET6:
8468                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8469                                                 break;
8470 #endif
8471                                         default:
8472                                                 /* TSNH */
8473                                                 mtu = net->mtu;
8474                                                 break;
8475                                         }
8476                                         to_out = 0;
8477                                         no_fragmentflg = 1;
8478                                 }
8479                         }
8480                 }
8481                 /* JRI: if dest is in PF state, do not send data to it */
8482                 if ((asoc->sctp_cmt_on_off > 0) &&
8483                     (net != stcb->asoc.alternate) &&
8484                     (net->dest_state & SCTP_ADDR_PF)) {
8485                         goto no_data_fill;
8486                 }
8487                 if (net->flight_size >= net->cwnd) {
8488                         goto no_data_fill;
8489                 }
8490                 if ((asoc->sctp_cmt_on_off > 0) &&
8491                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8492                     (net->flight_size > max_rwnd_per_dest)) {
8493                         goto no_data_fill;
8494                 }
8495                 /*
8496                  * We need a specific accounting for the usage of the send
8497                  * buffer. We also need to check the number of messages per
8498                  * net. For now, this is better than nothing and it disabled
8499                  * by default...
8500                  */
8501                 if ((asoc->sctp_cmt_on_off > 0) &&
8502                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8503                     (max_send_per_dest > 0) &&
8504                     (net->flight_size > max_send_per_dest)) {
8505                         goto no_data_fill;
8506                 }
8507                 /*********************/
8508                 /* Data transmission */
8509                 /*********************/
8510                 /*
8511                  * if AUTH for DATA is required and no AUTH has been added
8512                  * yet, account for this in the mtu now... if no data can be
8513                  * bundled, this adjustment won't matter anyways since the
8514                  * packet will be going out...
8515                  */
8516                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8517                     stcb->asoc.peer_auth_chunks);
8518                 if (data_auth_reqd && (auth == NULL)) {
8519                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8520                 }
8521                 /* now lets add any data within the MTU constraints */
8522                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8523 #ifdef INET
8524                 case AF_INET:
8525                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8526                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8527                         else
8528                                 omtu = 0;
8529                         break;
8530 #endif
8531 #ifdef INET6
8532                 case AF_INET6:
8533                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8534                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8535                         else
8536                                 omtu = 0;
8537                         break;
8538 #endif
8539                 default:
8540                         /* TSNH */
8541                         omtu = 0;
8542                         break;
8543                 }
8544                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8545                     (skip_data_for_this_net == 0)) ||
8546                     (cookie)) {
8547                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8548                                 if (no_data_chunks) {
8549                                         /* let only control go out */
8550                                         *reason_code = 1;
8551                                         break;
8552                                 }
8553                                 if (net->flight_size >= net->cwnd) {
8554                                         /* skip this net, no room for data */
8555                                         *reason_code = 2;
8556                                         break;
8557                                 }
8558                                 if ((chk->whoTo != NULL) &&
8559                                     (chk->whoTo != net)) {
8560                                         /* Don't send the chunk on this net */
8561                                         continue;
8562                                 }
8563                                 if (asoc->sctp_cmt_on_off == 0) {
8564                                         if ((asoc->alternate) &&
8565                                             (asoc->alternate != net) &&
8566                                             (chk->whoTo == NULL)) {
8567                                                 continue;
8568                                         } else if ((net != asoc->primary_destination) &&
8569                                                     (asoc->alternate == NULL) &&
8570                                             (chk->whoTo == NULL)) {
8571                                                 continue;
8572                                         }
8573                                 }
8574                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8575                                         /*-
8576                                          * strange, we have a chunk that is
8577                                          * to big for its destination and
8578                                          * yet no fragment ok flag.
8579                                          * Something went wrong when the
8580                                          * PMTU changed...we did not mark
8581                                          * this chunk for some reason?? I
8582                                          * will fix it here by letting IP
8583                                          * fragment it for now and printing
8584                                          * a warning. This really should not
8585                                          * happen ...
8586                                          */
8587                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8588                                             chk->send_size, mtu);
8589                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8590                                 }
8591                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8592                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8593                                         struct sctp_data_chunk *dchkh;
8594
8595                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8596                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8597                                 }
8598                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8599                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8600                                         /* ok we will add this one */
8601
8602                                         /*
8603                                          * Add an AUTH chunk, if chunk
8604                                          * requires it, save the offset into
8605                                          * the chain for AUTH
8606                                          */
8607                                         if (data_auth_reqd) {
8608                                                 if (auth == NULL) {
8609                                                         outchain = sctp_add_auth_chunk(outchain,
8610                                                             &endoutchain,
8611                                                             &auth,
8612                                                             &auth_offset,
8613                                                             stcb,
8614                                                             SCTP_DATA);
8615                                                         auth_keyid = chk->auth_keyid;
8616                                                         override_ok = 0;
8617                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8618                                                 } else if (override_ok) {
8619                                                         /*
8620                                                          * use this data's
8621                                                          * keyid
8622                                                          */
8623                                                         auth_keyid = chk->auth_keyid;
8624                                                         override_ok = 0;
8625                                                 } else if (auth_keyid != chk->auth_keyid) {
8626                                                         /*
8627                                                          * different keyid,
8628                                                          * so done bundling
8629                                                          */
8630                                                         break;
8631                                                 }
8632                                         }
8633                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8634                                             chk->send_size, chk->copy_by_ref);
8635                                         if (outchain == NULL) {
8636                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8637                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8638                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8639                                                 }
8640                                                 *reason_code = 3;
8641                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8642                                                 return (ENOMEM);
8643                                         }
8644                                         /* upate our MTU size */
8645                                         /* Do clear IP_DF ? */
8646                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8647                                                 no_fragmentflg = 0;
8648                                         }
8649                                         /* unsigned subtraction of mtu */
8650                                         if (mtu > chk->send_size)
8651                                                 mtu -= chk->send_size;
8652                                         else
8653                                                 mtu = 0;
8654                                         /* unsigned subtraction of r_mtu */
8655                                         if (r_mtu > chk->send_size)
8656                                                 r_mtu -= chk->send_size;
8657                                         else
8658                                                 r_mtu = 0;
8659
8660                                         to_out += chk->send_size;
8661                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8662 #ifdef INVARIANTS
8663                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8664 #else
8665                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8666                                                     mx_mtu, to_out);
8667 #endif
8668                                         }
8669                                         chk->window_probe = 0;
8670                                         data_list[bundle_at++] = chk;
8671                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8672                                                 break;
8673                                         }
8674                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8675                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8676                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8677                                                 } else {
8678                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8679                                                 }
8680                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8681                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8682                                                         /*
8683                                                          * Count number of
8684                                                          * user msg's that
8685                                                          * were fragmented
8686                                                          * we do this by
8687                                                          * counting when we
8688                                                          * see a LAST
8689                                                          * fragment only.
8690                                                          */
8691                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8692                                         }
8693                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8694                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8695                                                         data_list[0]->window_probe = 1;
8696                                                         net->window_probe = 1;
8697                                                 }
8698                                                 break;
8699                                         }
8700                                 } else {
8701                                         /*
8702                                          * Must be sent in order of the
8703                                          * TSN's (on a network)
8704                                          */
8705                                         break;
8706                                 }
8707                         }       /* for (chunk gather loop for this net) */
8708                 }               /* if asoc.state OPEN */
8709 no_data_fill:
8710                 /* Is there something to send for this destination? */
8711                 if (outchain) {
8712                         /* We may need to start a control timer or two */
8713                         if (asconf) {
8714                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8715                                     stcb, net);
8716                                 /*
8717                                  * do NOT clear the asconf flag as it is
8718                                  * used to do appropriate source address
8719                                  * selection.
8720                                  */
8721                         }
8722                         if (cookie) {
8723                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8724                                 cookie = 0;
8725                         }
8726                         /* must start a send timer if data is being sent */
8727                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8728                                 /*
8729                                  * no timer running on this destination
8730                                  * restart it.
8731                                  */
8732                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8733                         }
8734                         /* Now send it, if there is anything to send :> */
8735                         if ((error = sctp_lowlevel_chunk_output(inp,
8736                             stcb,
8737                             net,
8738                             (struct sockaddr *)&net->ro._l_addr,
8739                             outchain,
8740                             auth_offset,
8741                             auth,
8742                             auth_keyid,
8743                             no_fragmentflg,
8744                             bundle_at,
8745                             asconf,
8746                             inp->sctp_lport, stcb->rport,
8747                             htonl(stcb->asoc.peer_vtag),
8748                             net->port, NULL,
8749                             0, 0,
8750                             so_locked))) {
8751                                 /* error, we could not output */
8752                                 if (error == ENOBUFS) {
8753                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8754                                         asoc->ifp_had_enobuf = 1;
8755                                 }
8756                                 if (from_where == 0) {
8757                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8758                                 }
8759                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8760                                 if (hbflag) {
8761                                         if (*now_filled == 0) {
8762                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8763                                                 *now_filled = 1;
8764                                                 *now = net->last_sent_time;
8765                                         } else {
8766                                                 net->last_sent_time = *now;
8767                                         }
8768                                         hbflag = 0;
8769                                 }
8770                                 if (error == EHOSTUNREACH) {
8771                                         /*
8772                                          * Destination went unreachable
8773                                          * during this send
8774                                          */
8775                                         sctp_move_chunks_from_net(stcb, net);
8776                                 }
8777                                 *reason_code = 6;
8778                                 /*-
8779                                  * I add this line to be paranoid. As far as
8780                                  * I can tell the continue, takes us back to
8781                                  * the top of the for, but just to make sure
8782                                  * I will reset these again here.
8783                                  */
8784                                 ctl_cnt = bundle_at = 0;
8785                                 continue;       /* This takes us back to the
8786                                                  * for() for the nets. */
8787                         } else {
8788                                 asoc->ifp_had_enobuf = 0;
8789                         }
8790                         endoutchain = NULL;
8791                         auth = NULL;
8792                         auth_offset = 0;
8793                         if (bundle_at || hbflag) {
8794                                 /* For data/asconf and hb set time */
8795                                 if (*now_filled == 0) {
8796                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8797                                         *now_filled = 1;
8798                                         *now = net->last_sent_time;
8799                                 } else {
8800                                         net->last_sent_time = *now;
8801                                 }
8802                         }
8803                         if (!no_out_cnt) {
8804                                 *num_out += (ctl_cnt + bundle_at);
8805                         }
8806                         if (bundle_at) {
8807                                 /* setup for a RTO measurement */
8808                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8809                                 /* fill time if not already filled */
8810                                 if (*now_filled == 0) {
8811                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8812                                         *now_filled = 1;
8813                                         *now = asoc->time_last_sent;
8814                                 } else {
8815                                         asoc->time_last_sent = *now;
8816                                 }
8817                                 if (net->rto_needed) {
8818                                         data_list[0]->do_rtt = 1;
8819                                         net->rto_needed = 0;
8820                                 }
8821                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8822                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8823                         }
8824                         if (one_chunk) {
8825                                 break;
8826                         }
8827                 }
8828                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8829                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8830                 }
8831         }
8832         if (old_start_at == NULL) {
8833                 old_start_at = start_at;
8834                 start_at = TAILQ_FIRST(&asoc->nets);
8835                 if (old_start_at)
8836                         goto again_one_more_time;
8837         }
8838         /*
8839          * At the end there should be no NON timed chunks hanging on this
8840          * queue.
8841          */
8842         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8843                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8844         }
8845         if ((*num_out == 0) && (*reason_code == 0)) {
8846                 *reason_code = 4;
8847         } else {
8848                 *reason_code = 5;
8849         }
8850         sctp_clean_up_ctl(stcb, asoc, so_locked);
8851         return (0);
8852 }
8853
8854 void
8855 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8856 {
8857         /*-
8858          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8859          * the control chunk queue.
8860          */
8861         struct sctp_chunkhdr *hdr;
8862         struct sctp_tmit_chunk *chk;
8863         struct mbuf *mat;
8864
8865         SCTP_TCB_LOCK_ASSERT(stcb);
8866         sctp_alloc_a_chunk(stcb, chk);
8867         if (chk == NULL) {
8868                 /* no memory */
8869                 sctp_m_freem(op_err);
8870                 return;
8871         }
8872         chk->copy_by_ref = 0;
8873         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8874         if (op_err == NULL) {
8875                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8876                 return;
8877         }
8878         chk->send_size = 0;
8879         mat = op_err;
8880         while (mat != NULL) {
8881                 chk->send_size += SCTP_BUF_LEN(mat);
8882                 mat = SCTP_BUF_NEXT(mat);
8883         }
8884         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8885         chk->rec.chunk_id.can_take_data = 1;
8886         chk->sent = SCTP_DATAGRAM_UNSENT;
8887         chk->snd_count = 0;
8888         chk->flags = 0;
8889         chk->asoc = &stcb->asoc;
8890         chk->data = op_err;
8891         chk->whoTo = NULL;
8892         hdr = mtod(op_err, struct sctp_chunkhdr *);
8893         hdr->chunk_type = SCTP_OPERATION_ERROR;
8894         hdr->chunk_flags = 0;
8895         hdr->chunk_length = htons(chk->send_size);
8896         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8897             chk,
8898             sctp_next);
8899         chk->asoc->ctrl_queue_cnt++;
8900 }
8901
8902 int
8903 sctp_send_cookie_echo(struct mbuf *m,
8904     int offset,
8905     struct sctp_tcb *stcb,
8906     struct sctp_nets *net)
8907 {
8908         /*-
8909          * pull out the cookie and put it at the front of the control chunk
8910          * queue.
8911          */
8912         int at;
8913         struct mbuf *cookie;
8914         struct sctp_paramhdr parm, *phdr;
8915         struct sctp_chunkhdr *hdr;
8916         struct sctp_tmit_chunk *chk;
8917         uint16_t ptype, plen;
8918
8919         /* First find the cookie in the param area */
8920         cookie = NULL;
8921         at = offset + sizeof(struct sctp_init_chunk);
8922
8923         SCTP_TCB_LOCK_ASSERT(stcb);
8924         do {
8925                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8926                 if (phdr == NULL) {
8927                         return (-3);
8928                 }
8929                 ptype = ntohs(phdr->param_type);
8930                 plen = ntohs(phdr->param_length);
8931                 if (ptype == SCTP_STATE_COOKIE) {
8932                         int pad;
8933
8934                         /* found the cookie */
8935                         if ((pad = (plen % 4))) {
8936                                 plen += 4 - pad;
8937                         }
8938                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8939                         if (cookie == NULL) {
8940                                 /* No memory */
8941                                 return (-2);
8942                         }
8943 #ifdef SCTP_MBUF_LOGGING
8944                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8945                                 struct mbuf *mat;
8946
8947                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8948                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8949                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8950                                         }
8951                                 }
8952                         }
8953 #endif
8954                         break;
8955                 }
8956                 at += SCTP_SIZE32(plen);
8957         } while (phdr);
8958         if (cookie == NULL) {
8959                 /* Did not find the cookie */
8960                 return (-3);
8961         }
8962         /* ok, we got the cookie lets change it into a cookie echo chunk */
8963
8964         /* first the change from param to cookie */
8965         hdr = mtod(cookie, struct sctp_chunkhdr *);
8966         hdr->chunk_type = SCTP_COOKIE_ECHO;
8967         hdr->chunk_flags = 0;
8968         /* get the chunk stuff now and place it in the FRONT of the queue */
8969         sctp_alloc_a_chunk(stcb, chk);
8970         if (chk == NULL) {
8971                 /* no memory */
8972                 sctp_m_freem(cookie);
8973                 return (-5);
8974         }
8975         chk->copy_by_ref = 0;
8976         chk->send_size = plen;
8977         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8978         chk->rec.chunk_id.can_take_data = 0;
8979         chk->sent = SCTP_DATAGRAM_UNSENT;
8980         chk->snd_count = 0;
8981         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8982         chk->asoc = &stcb->asoc;
8983         chk->data = cookie;
8984         chk->whoTo = net;
8985         atomic_add_int(&chk->whoTo->ref_count, 1);
8986         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
8987         chk->asoc->ctrl_queue_cnt++;
8988         return (0);
8989 }
8990
8991 void
8992 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
8993     struct mbuf *m,
8994     int offset,
8995     int chk_length,
8996     struct sctp_nets *net)
8997 {
8998         /*
8999          * take a HB request and make it into a HB ack and send it.
9000          */
9001         struct mbuf *outchain;
9002         struct sctp_chunkhdr *chdr;
9003         struct sctp_tmit_chunk *chk;
9004
9005
9006         if (net == NULL)
9007                 /* must have a net pointer */
9008                 return;
9009
9010         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
9011         if (outchain == NULL) {
9012                 /* gak out of memory */
9013                 return;
9014         }
9015 #ifdef SCTP_MBUF_LOGGING
9016         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9017                 struct mbuf *mat;
9018
9019                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9020                         if (SCTP_BUF_IS_EXTENDED(mat)) {
9021                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9022                         }
9023                 }
9024         }
9025 #endif
9026         chdr = mtod(outchain, struct sctp_chunkhdr *);
9027         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9028         chdr->chunk_flags = 0;
9029         if (chk_length % 4) {
9030                 /* need pad */
9031                 uint32_t cpthis = 0;
9032                 int padlen;
9033
9034                 padlen = 4 - (chk_length % 4);
9035                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9036         }
9037         sctp_alloc_a_chunk(stcb, chk);
9038         if (chk == NULL) {
9039                 /* no memory */
9040                 sctp_m_freem(outchain);
9041                 return;
9042         }
9043         chk->copy_by_ref = 0;
9044         chk->send_size = chk_length;
9045         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9046         chk->rec.chunk_id.can_take_data = 1;
9047         chk->sent = SCTP_DATAGRAM_UNSENT;
9048         chk->snd_count = 0;
9049         chk->flags = 0;
9050         chk->asoc = &stcb->asoc;
9051         chk->data = outchain;
9052         chk->whoTo = net;
9053         atomic_add_int(&chk->whoTo->ref_count, 1);
9054         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9055         chk->asoc->ctrl_queue_cnt++;
9056 }
9057
9058 void
9059 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9060 {
9061         /* formulate and queue a cookie-ack back to sender */
9062         struct mbuf *cookie_ack;
9063         struct sctp_chunkhdr *hdr;
9064         struct sctp_tmit_chunk *chk;
9065
9066         cookie_ack = NULL;
9067         SCTP_TCB_LOCK_ASSERT(stcb);
9068
9069         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9070         if (cookie_ack == NULL) {
9071                 /* no mbuf's */
9072                 return;
9073         }
9074         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9075         sctp_alloc_a_chunk(stcb, chk);
9076         if (chk == NULL) {
9077                 /* no memory */
9078                 sctp_m_freem(cookie_ack);
9079                 return;
9080         }
9081         chk->copy_by_ref = 0;
9082         chk->send_size = sizeof(struct sctp_chunkhdr);
9083         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9084         chk->rec.chunk_id.can_take_data = 1;
9085         chk->sent = SCTP_DATAGRAM_UNSENT;
9086         chk->snd_count = 0;
9087         chk->flags = 0;
9088         chk->asoc = &stcb->asoc;
9089         chk->data = cookie_ack;
9090         if (chk->asoc->last_control_chunk_from != NULL) {
9091                 chk->whoTo = chk->asoc->last_control_chunk_from;
9092                 atomic_add_int(&chk->whoTo->ref_count, 1);
9093         } else {
9094                 chk->whoTo = NULL;
9095         }
9096         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9097         hdr->chunk_type = SCTP_COOKIE_ACK;
9098         hdr->chunk_flags = 0;
9099         hdr->chunk_length = htons(chk->send_size);
9100         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9101         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9102         chk->asoc->ctrl_queue_cnt++;
9103         return;
9104 }
9105
9106
9107 void
9108 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9109 {
9110         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9111         struct mbuf *m_shutdown_ack;
9112         struct sctp_shutdown_ack_chunk *ack_cp;
9113         struct sctp_tmit_chunk *chk;
9114
9115         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9116         if (m_shutdown_ack == NULL) {
9117                 /* no mbuf's */
9118                 return;
9119         }
9120         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9121         sctp_alloc_a_chunk(stcb, chk);
9122         if (chk == NULL) {
9123                 /* no memory */
9124                 sctp_m_freem(m_shutdown_ack);
9125                 return;
9126         }
9127         chk->copy_by_ref = 0;
9128         chk->send_size = sizeof(struct sctp_chunkhdr);
9129         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9130         chk->rec.chunk_id.can_take_data = 1;
9131         chk->sent = SCTP_DATAGRAM_UNSENT;
9132         chk->snd_count = 0;
9133         chk->flags = 0;
9134         chk->asoc = &stcb->asoc;
9135         chk->data = m_shutdown_ack;
9136         chk->whoTo = net;
9137         if (chk->whoTo) {
9138                 atomic_add_int(&chk->whoTo->ref_count, 1);
9139         }
9140         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9141         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9142         ack_cp->ch.chunk_flags = 0;
9143         ack_cp->ch.chunk_length = htons(chk->send_size);
9144         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9145         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9146         chk->asoc->ctrl_queue_cnt++;
9147         return;
9148 }
9149
9150 void
9151 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9152 {
9153         /* formulate and queue a SHUTDOWN to the sender */
9154         struct mbuf *m_shutdown;
9155         struct sctp_shutdown_chunk *shutdown_cp;
9156         struct sctp_tmit_chunk *chk;
9157
9158         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9159         if (m_shutdown == NULL) {
9160                 /* no mbuf's */
9161                 return;
9162         }
9163         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9164         sctp_alloc_a_chunk(stcb, chk);
9165         if (chk == NULL) {
9166                 /* no memory */
9167                 sctp_m_freem(m_shutdown);
9168                 return;
9169         }
9170         chk->copy_by_ref = 0;
9171         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9172         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9173         chk->rec.chunk_id.can_take_data = 1;
9174         chk->sent = SCTP_DATAGRAM_UNSENT;
9175         chk->snd_count = 0;
9176         chk->flags = 0;
9177         chk->asoc = &stcb->asoc;
9178         chk->data = m_shutdown;
9179         chk->whoTo = net;
9180         if (chk->whoTo) {
9181                 atomic_add_int(&chk->whoTo->ref_count, 1);
9182         }
9183         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9184         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9185         shutdown_cp->ch.chunk_flags = 0;
9186         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9187         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9188         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9189         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9190         chk->asoc->ctrl_queue_cnt++;
9191         return;
9192 }
9193
9194 void
9195 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9196 {
9197         /*
9198          * formulate and queue an ASCONF to the peer. ASCONF parameters
9199          * should be queued on the assoc queue.
9200          */
9201         struct sctp_tmit_chunk *chk;
9202         struct mbuf *m_asconf;
9203         int len;
9204
9205         SCTP_TCB_LOCK_ASSERT(stcb);
9206
9207         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9208             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9209                 /* can't send a new one if there is one in flight already */
9210                 return;
9211         }
9212         /* compose an ASCONF chunk, maximum length is PMTU */
9213         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9214         if (m_asconf == NULL) {
9215                 return;
9216         }
9217         sctp_alloc_a_chunk(stcb, chk);
9218         if (chk == NULL) {
9219                 /* no memory */
9220                 sctp_m_freem(m_asconf);
9221                 return;
9222         }
9223         chk->copy_by_ref = 0;
9224         chk->data = m_asconf;
9225         chk->send_size = len;
9226         chk->rec.chunk_id.id = SCTP_ASCONF;
9227         chk->rec.chunk_id.can_take_data = 0;
9228         chk->sent = SCTP_DATAGRAM_UNSENT;
9229         chk->snd_count = 0;
9230         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9231         chk->asoc = &stcb->asoc;
9232         chk->whoTo = net;
9233         if (chk->whoTo) {
9234                 atomic_add_int(&chk->whoTo->ref_count, 1);
9235         }
9236         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9237         chk->asoc->ctrl_queue_cnt++;
9238         return;
9239 }
9240
9241 void
9242 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9243 {
9244         /*
9245          * formulate and queue a asconf-ack back to sender. the asconf-ack
9246          * must be stored in the tcb.
9247          */
9248         struct sctp_tmit_chunk *chk;
9249         struct sctp_asconf_ack *ack, *latest_ack;
9250         struct mbuf *m_ack;
9251         struct sctp_nets *net = NULL;
9252
9253         SCTP_TCB_LOCK_ASSERT(stcb);
9254         /* Get the latest ASCONF-ACK */
9255         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9256         if (latest_ack == NULL) {
9257                 return;
9258         }
9259         if (latest_ack->last_sent_to != NULL &&
9260             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9261                 /* we're doing a retransmission */
9262                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9263                 if (net == NULL) {
9264                         /* no alternate */
9265                         if (stcb->asoc.last_control_chunk_from == NULL) {
9266                                 if (stcb->asoc.alternate) {
9267                                         net = stcb->asoc.alternate;
9268                                 } else {
9269                                         net = stcb->asoc.primary_destination;
9270                                 }
9271                         } else {
9272                                 net = stcb->asoc.last_control_chunk_from;
9273                         }
9274                 }
9275         } else {
9276                 /* normal case */
9277                 if (stcb->asoc.last_control_chunk_from == NULL) {
9278                         if (stcb->asoc.alternate) {
9279                                 net = stcb->asoc.alternate;
9280                         } else {
9281                                 net = stcb->asoc.primary_destination;
9282                         }
9283                 } else {
9284                         net = stcb->asoc.last_control_chunk_from;
9285                 }
9286         }
9287         latest_ack->last_sent_to = net;
9288
9289         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9290                 if (ack->data == NULL) {
9291                         continue;
9292                 }
9293                 /* copy the asconf_ack */
9294                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9295                 if (m_ack == NULL) {
9296                         /* couldn't copy it */
9297                         return;
9298                 }
9299 #ifdef SCTP_MBUF_LOGGING
9300                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9301                         struct mbuf *mat;
9302
9303                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9304                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9305                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9306                                 }
9307                         }
9308                 }
9309 #endif
9310
9311                 sctp_alloc_a_chunk(stcb, chk);
9312                 if (chk == NULL) {
9313                         /* no memory */
9314                         if (m_ack)
9315                                 sctp_m_freem(m_ack);
9316                         return;
9317                 }
9318                 chk->copy_by_ref = 0;
9319
9320                 chk->whoTo = net;
9321                 if (chk->whoTo) {
9322                         atomic_add_int(&chk->whoTo->ref_count, 1);
9323                 }
9324                 chk->data = m_ack;
9325                 chk->send_size = 0;
9326                 /* Get size */
9327                 chk->send_size = ack->len;
9328                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9329                 chk->rec.chunk_id.can_take_data = 1;
9330                 chk->sent = SCTP_DATAGRAM_UNSENT;
9331                 chk->snd_count = 0;
9332                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9333                 chk->asoc = &stcb->asoc;
9334
9335                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9336                 chk->asoc->ctrl_queue_cnt++;
9337         }
9338         return;
9339 }
9340
9341
9342 static int
9343 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9344     struct sctp_tcb *stcb,
9345     struct sctp_association *asoc,
9346     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9347 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9348     SCTP_UNUSED
9349 #endif
9350 )
9351 {
9352         /*-
9353          * send out one MTU of retransmission. If fast_retransmit is
9354          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9355          * rwnd. For a Cookie or Asconf in the control chunk queue we
9356          * retransmit them by themselves.
9357          *
9358          * For data chunks we will pick out the lowest TSN's in the sent_queue
9359          * marked for resend and bundle them all together (up to a MTU of
9360          * destination). The address to send to should have been
9361          * selected/changed where the retransmission was marked (i.e. in FR
9362          * or t3-timeout routines).
9363          */
9364         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9365         struct sctp_tmit_chunk *chk, *fwd;
9366         struct mbuf *m, *endofchain;
9367         struct sctp_nets *net = NULL;
9368         uint32_t tsns_sent = 0;
9369         int no_fragmentflg, bundle_at, cnt_thru;
9370         unsigned int mtu;
9371         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9372         struct sctp_auth_chunk *auth = NULL;
9373         uint32_t auth_offset = 0;
9374         uint16_t auth_keyid;
9375         int override_ok = 1;
9376         int data_auth_reqd = 0;
9377         uint32_t dmtu = 0;
9378
9379         SCTP_TCB_LOCK_ASSERT(stcb);
9380         tmr_started = ctl_cnt = bundle_at = error = 0;
9381         no_fragmentflg = 1;
9382         fwd_tsn = 0;
9383         *cnt_out = 0;
9384         fwd = NULL;
9385         endofchain = m = NULL;
9386         auth_keyid = stcb->asoc.authinfo.active_keyid;
9387 #ifdef SCTP_AUDITING_ENABLED
9388         sctp_audit_log(0xC3, 1);
9389 #endif
9390         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9391             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9392                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9393                     asoc->sent_queue_retran_cnt);
9394                 asoc->sent_queue_cnt = 0;
9395                 asoc->sent_queue_cnt_removeable = 0;
9396                 /* send back 0/0 so we enter normal transmission */
9397                 *cnt_out = 0;
9398                 return (0);
9399         }
9400         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9401                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9402                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9403                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9404                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9405                                 continue;
9406                         }
9407                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9408                                 if (chk != asoc->str_reset) {
9409                                         /*
9410                                          * not eligible for retran if its
9411                                          * not ours
9412                                          */
9413                                         continue;
9414                                 }
9415                         }
9416                         ctl_cnt++;
9417                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9418                                 fwd_tsn = 1;
9419                         }
9420                         /*
9421                          * Add an AUTH chunk, if chunk requires it save the
9422                          * offset into the chain for AUTH
9423                          */
9424                         if ((auth == NULL) &&
9425                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9426                             stcb->asoc.peer_auth_chunks))) {
9427                                 m = sctp_add_auth_chunk(m, &endofchain,
9428                                     &auth, &auth_offset,
9429                                     stcb,
9430                                     chk->rec.chunk_id.id);
9431                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9432                         }
9433                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9434                         break;
9435                 }
9436         }
9437         one_chunk = 0;
9438         cnt_thru = 0;
9439         /* do we have control chunks to retransmit? */
9440         if (m != NULL) {
9441                 /* Start a timer no matter if we suceed or fail */
9442                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9443                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9444                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9445                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9446                 chk->snd_count++;       /* update our count */
9447                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9448                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9449                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9450                     no_fragmentflg, 0, 0,
9451                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9452                     chk->whoTo->port, NULL,
9453                     0, 0,
9454                     so_locked))) {
9455                         SCTP_STAT_INCR(sctps_lowlevelerr);
9456                         return (error);
9457                 }
9458                 endofchain = NULL;
9459                 auth = NULL;
9460                 auth_offset = 0;
9461                 /*
9462                  * We don't want to mark the net->sent time here since this
9463                  * we use this for HB and retrans cannot measure RTT
9464                  */
9465                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9466                 *cnt_out += 1;
9467                 chk->sent = SCTP_DATAGRAM_SENT;
9468                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9469                 if (fwd_tsn == 0) {
9470                         return (0);
9471                 } else {
9472                         /* Clean up the fwd-tsn list */
9473                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9474                         return (0);
9475                 }
9476         }
9477         /*
9478          * Ok, it is just data retransmission we need to do or that and a
9479          * fwd-tsn with it all.
9480          */
9481         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9482                 return (SCTP_RETRAN_DONE);
9483         }
9484         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9485             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9486                 /* not yet open, resend the cookie and that is it */
9487                 return (1);
9488         }
9489 #ifdef SCTP_AUDITING_ENABLED
9490         sctp_auditing(20, inp, stcb, NULL);
9491 #endif
9492         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9493         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9494                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9495                         /* No, not sent to this net or not ready for rtx */
9496                         continue;
9497                 }
9498                 if (chk->data == NULL) {
9499                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9500                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9501                         continue;
9502                 }
9503                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9504                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9505                         /* Gak, we have exceeded max unlucky retran, abort! */
9506                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9507                             chk->snd_count,
9508                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9509                         atomic_add_int(&stcb->asoc.refcnt, 1);
9510                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9511                         SCTP_TCB_LOCK(stcb);
9512                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9513                         return (SCTP_RETRAN_EXIT);
9514                 }
9515                 /* pick up the net */
9516                 net = chk->whoTo;
9517                 switch (net->ro._l_addr.sa.sa_family) {
9518 #ifdef INET
9519                 case AF_INET:
9520                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9521                         break;
9522 #endif
9523 #ifdef INET6
9524                 case AF_INET6:
9525                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9526                         break;
9527 #endif
9528                 default:
9529                         /* TSNH */
9530                         mtu = net->mtu;
9531                         break;
9532                 }
9533
9534                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9535                         /* No room in peers rwnd */
9536                         uint32_t tsn;
9537
9538                         tsn = asoc->last_acked_seq + 1;
9539                         if (tsn == chk->rec.data.TSN_seq) {
9540                                 /*
9541                                  * we make a special exception for this
9542                                  * case. The peer has no rwnd but is missing
9543                                  * the lowest chunk.. which is probably what
9544                                  * is holding up the rwnd.
9545                                  */
9546                                 goto one_chunk_around;
9547                         }
9548                         return (1);
9549                 }
9550 one_chunk_around:
9551                 if (asoc->peers_rwnd < mtu) {
9552                         one_chunk = 1;
9553                         if ((asoc->peers_rwnd == 0) &&
9554                             (asoc->total_flight == 0)) {
9555                                 chk->window_probe = 1;
9556                                 chk->whoTo->window_probe = 1;
9557                         }
9558                 }
9559 #ifdef SCTP_AUDITING_ENABLED
9560                 sctp_audit_log(0xC3, 2);
9561 #endif
9562                 bundle_at = 0;
9563                 m = NULL;
9564                 net->fast_retran_ip = 0;
9565                 if (chk->rec.data.doing_fast_retransmit == 0) {
9566                         /*
9567                          * if no FR in progress skip destination that have
9568                          * flight_size > cwnd.
9569                          */
9570                         if (net->flight_size >= net->cwnd) {
9571                                 continue;
9572                         }
9573                 } else {
9574                         /*
9575                          * Mark the destination net to have FR recovery
9576                          * limits put on it.
9577                          */
9578                         *fr_done = 1;
9579                         net->fast_retran_ip = 1;
9580                 }
9581
9582                 /*
9583                  * if no AUTH is yet included and this chunk requires it,
9584                  * make sure to account for it.  We don't apply the size
9585                  * until the AUTH chunk is actually added below in case
9586                  * there is no room for this chunk.
9587                  */
9588                 if (data_auth_reqd && (auth == NULL)) {
9589                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9590                 } else
9591                         dmtu = 0;
9592
9593                 if ((chk->send_size <= (mtu - dmtu)) ||
9594                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9595                         /* ok we will add this one */
9596                         if (data_auth_reqd) {
9597                                 if (auth == NULL) {
9598                                         m = sctp_add_auth_chunk(m,
9599                                             &endofchain,
9600                                             &auth,
9601                                             &auth_offset,
9602                                             stcb,
9603                                             SCTP_DATA);
9604                                         auth_keyid = chk->auth_keyid;
9605                                         override_ok = 0;
9606                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9607                                 } else if (override_ok) {
9608                                         auth_keyid = chk->auth_keyid;
9609                                         override_ok = 0;
9610                                 } else if (chk->auth_keyid != auth_keyid) {
9611                                         /* different keyid, so done bundling */
9612                                         break;
9613                                 }
9614                         }
9615                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9616                         if (m == NULL) {
9617                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9618                                 return (ENOMEM);
9619                         }
9620                         /* Do clear IP_DF ? */
9621                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9622                                 no_fragmentflg = 0;
9623                         }
9624                         /* upate our MTU size */
9625                         if (mtu > (chk->send_size + dmtu))
9626                                 mtu -= (chk->send_size + dmtu);
9627                         else
9628                                 mtu = 0;
9629                         data_list[bundle_at++] = chk;
9630                         if (one_chunk && (asoc->total_flight <= 0)) {
9631                                 SCTP_STAT_INCR(sctps_windowprobed);
9632                         }
9633                 }
9634                 if (one_chunk == 0) {
9635                         /*
9636                          * now are there anymore forward from chk to pick
9637                          * up?
9638                          */
9639                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9640                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9641                                         /* Nope, not for retran */
9642                                         continue;
9643                                 }
9644                                 if (fwd->whoTo != net) {
9645                                         /* Nope, not the net in question */
9646                                         continue;
9647                                 }
9648                                 if (data_auth_reqd && (auth == NULL)) {
9649                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9650                                 } else
9651                                         dmtu = 0;
9652                                 if (fwd->send_size <= (mtu - dmtu)) {
9653                                         if (data_auth_reqd) {
9654                                                 if (auth == NULL) {
9655                                                         m = sctp_add_auth_chunk(m,
9656                                                             &endofchain,
9657                                                             &auth,
9658                                                             &auth_offset,
9659                                                             stcb,
9660                                                             SCTP_DATA);
9661                                                         auth_keyid = fwd->auth_keyid;
9662                                                         override_ok = 0;
9663                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9664                                                 } else if (override_ok) {
9665                                                         auth_keyid = fwd->auth_keyid;
9666                                                         override_ok = 0;
9667                                                 } else if (fwd->auth_keyid != auth_keyid) {
9668                                                         /*
9669                                                          * different keyid,
9670                                                          * so done bundling
9671                                                          */
9672                                                         break;
9673                                                 }
9674                                         }
9675                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9676                                         if (m == NULL) {
9677                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9678                                                 return (ENOMEM);
9679                                         }
9680                                         /* Do clear IP_DF ? */
9681                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9682                                                 no_fragmentflg = 0;
9683                                         }
9684                                         /* upate our MTU size */
9685                                         if (mtu > (fwd->send_size + dmtu))
9686                                                 mtu -= (fwd->send_size + dmtu);
9687                                         else
9688                                                 mtu = 0;
9689                                         data_list[bundle_at++] = fwd;
9690                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9691                                                 break;
9692                                         }
9693                                 } else {
9694                                         /* can't fit so we are done */
9695                                         break;
9696                                 }
9697                         }
9698                 }
9699                 /* Is there something to send for this destination? */
9700                 if (m) {
9701                         /*
9702                          * No matter if we fail/or suceed we should start a
9703                          * timer. A failure is like a lost IP packet :-)
9704                          */
9705                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9706                                 /*
9707                                  * no timer running on this destination
9708                                  * restart it.
9709                                  */
9710                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9711                                 tmr_started = 1;
9712                         }
9713                         /* Now lets send it, if there is anything to send :> */
9714                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9715                             (struct sockaddr *)&net->ro._l_addr, m,
9716                             auth_offset, auth, auth_keyid,
9717                             no_fragmentflg, 0, 0,
9718                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9719                             net->port, NULL,
9720                             0, 0,
9721                             so_locked))) {
9722                                 /* error, we could not output */
9723                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9724                                 return (error);
9725                         }
9726                         endofchain = NULL;
9727                         auth = NULL;
9728                         auth_offset = 0;
9729                         /* For HB's */
9730                         /*
9731                          * We don't want to mark the net->sent time here
9732                          * since this we use this for HB and retrans cannot
9733                          * measure RTT
9734                          */
9735                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9736
9737                         /* For auto-close */
9738                         cnt_thru++;
9739                         if (*now_filled == 0) {
9740                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9741                                 *now = asoc->time_last_sent;
9742                                 *now_filled = 1;
9743                         } else {
9744                                 asoc->time_last_sent = *now;
9745                         }
9746                         *cnt_out += bundle_at;
9747 #ifdef SCTP_AUDITING_ENABLED
9748                         sctp_audit_log(0xC4, bundle_at);
9749 #endif
9750                         if (bundle_at) {
9751                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9752                         }
9753                         for (i = 0; i < bundle_at; i++) {
9754                                 SCTP_STAT_INCR(sctps_sendretransdata);
9755                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9756                                 /*
9757                                  * When we have a revoked data, and we
9758                                  * retransmit it, then we clear the revoked
9759                                  * flag since this flag dictates if we
9760                                  * subtracted from the fs
9761                                  */
9762                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9763                                         /* Deflate the cwnd */
9764                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9765                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9766                                 }
9767                                 data_list[i]->snd_count++;
9768                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9769                                 /* record the time */
9770                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9771                                 if (data_list[i]->book_size_scale) {
9772                                         /*
9773                                          * need to double the book size on
9774                                          * this one
9775                                          */
9776                                         data_list[i]->book_size_scale = 0;
9777                                         /*
9778                                          * Since we double the booksize, we
9779                                          * must also double the output queue
9780                                          * size, since this get shrunk when
9781                                          * we free by this amount.
9782                                          */
9783                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9784                                         data_list[i]->book_size *= 2;
9785
9786
9787                                 } else {
9788                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9789                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9790                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9791                                         }
9792                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9793                                             (uint32_t) (data_list[i]->send_size +
9794                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9795                                 }
9796                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9797                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9798                                             data_list[i]->whoTo->flight_size,
9799                                             data_list[i]->book_size,
9800                                             (uintptr_t) data_list[i]->whoTo,
9801                                             data_list[i]->rec.data.TSN_seq);
9802                                 }
9803                                 sctp_flight_size_increase(data_list[i]);
9804                                 sctp_total_flight_increase(stcb, data_list[i]);
9805                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9806                                         /* SWS sender side engages */
9807                                         asoc->peers_rwnd = 0;
9808                                 }
9809                                 if ((i == 0) &&
9810                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9811                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9812                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9813                                             (tmr_started == 0)) {
9814                                                 /*-
9815                                                  * ok we just fast-retrans'd
9816                                                  * the lowest TSN, i.e the
9817                                                  * first on the list. In
9818                                                  * this case we want to give
9819                                                  * some more time to get a
9820                                                  * SACK back without a
9821                                                  * t3-expiring.
9822                                                  */
9823                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9824                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9825                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9826                                         }
9827                                 }
9828                         }
9829                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9830                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9831                         }
9832 #ifdef SCTP_AUDITING_ENABLED
9833                         sctp_auditing(21, inp, stcb, NULL);
9834 #endif
9835                 } else {
9836                         /* None will fit */
9837                         return (1);
9838                 }
9839                 if (asoc->sent_queue_retran_cnt <= 0) {
9840                         /* all done we have no more to retran */
9841                         asoc->sent_queue_retran_cnt = 0;
9842                         break;
9843                 }
9844                 if (one_chunk) {
9845                         /* No more room in rwnd */
9846                         return (1);
9847                 }
9848                 /* stop the for loop here. we sent out a packet */
9849                 break;
9850         }
9851         return (0);
9852 }
9853
9854 static void
9855 sctp_timer_validation(struct sctp_inpcb *inp,
9856     struct sctp_tcb *stcb,
9857     struct sctp_association *asoc)
9858 {
9859         struct sctp_nets *net;
9860
9861         /* Validate that a timer is running somewhere */
9862         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9863                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9864                         /* Here is a timer */
9865                         return;
9866                 }
9867         }
9868         SCTP_TCB_LOCK_ASSERT(stcb);
9869         /* Gak, we did not have a timer somewhere */
9870         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9871         if (asoc->alternate) {
9872                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9873         } else {
9874                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9875         }
9876         return;
9877 }
9878
9879 void
9880 sctp_chunk_output(struct sctp_inpcb *inp,
9881     struct sctp_tcb *stcb,
9882     int from_where,
9883     int so_locked
9884 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9885     SCTP_UNUSED
9886 #endif
9887 )
9888 {
9889         /*-
9890          * Ok this is the generic chunk service queue. we must do the
9891          * following:
9892          * - See if there are retransmits pending, if so we must
9893          *   do these first.
9894          * - Service the stream queue that is next, moving any
9895          *   message (note I must get a complete message i.e.
9896          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9897          *   TSN's
9898          * - Check to see if the cwnd/rwnd allows any output, if so we
9899          *   go ahead and fomulate and send the low level chunks. Making sure
9900          *   to combine any control in the control chunk queue also.
9901          */
9902         struct sctp_association *asoc;
9903         struct sctp_nets *net;
9904         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9905         unsigned int burst_cnt = 0;
9906         struct timeval now;
9907         int now_filled = 0;
9908         int nagle_on;
9909         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9910         int un_sent = 0;
9911         int fr_done;
9912         unsigned int tot_frs = 0;
9913
9914         asoc = &stcb->asoc;
9915         /* The Nagle algorithm is only applied when handling a send call. */
9916         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9917                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9918                         nagle_on = 0;
9919                 } else {
9920                         nagle_on = 1;
9921                 }
9922         } else {
9923                 nagle_on = 0;
9924         }
9925         SCTP_TCB_LOCK_ASSERT(stcb);
9926
9927         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9928
9929         if ((un_sent <= 0) &&
9930             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9931             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9932             (asoc->sent_queue_retran_cnt == 0)) {
9933                 /* Nothing to do unless there is something to be sent left */
9934                 return;
9935         }
9936         /*
9937          * Do we have something to send, data or control AND a sack timer
9938          * running, if so piggy-back the sack.
9939          */
9940         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9941                 sctp_send_sack(stcb, so_locked);
9942                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9943         }
9944         while (asoc->sent_queue_retran_cnt) {
9945                 /*-
9946                  * Ok, it is retransmission time only, we send out only ONE
9947                  * packet with a single call off to the retran code.
9948                  */
9949                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9950                         /*-
9951                          * Special hook for handling cookiess discarded
9952                          * by peer that carried data. Send cookie-ack only
9953                          * and then the next call with get the retran's.
9954                          */
9955                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9956                             from_where,
9957                             &now, &now_filled, frag_point, so_locked);
9958                         return;
9959                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9960                         /* if its not from a HB then do it */
9961                         fr_done = 0;
9962                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9963                         if (fr_done) {
9964                                 tot_frs++;
9965                         }
9966                 } else {
9967                         /*
9968                          * its from any other place, we don't allow retran
9969                          * output (only control)
9970                          */
9971                         ret = 1;
9972                 }
9973                 if (ret > 0) {
9974                         /* Can't send anymore */
9975                         /*-
9976                          * now lets push out control by calling med-level
9977                          * output once. this assures that we WILL send HB's
9978                          * if queued too.
9979                          */
9980                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9981                             from_where,
9982                             &now, &now_filled, frag_point, so_locked);
9983 #ifdef SCTP_AUDITING_ENABLED
9984                         sctp_auditing(8, inp, stcb, NULL);
9985 #endif
9986                         sctp_timer_validation(inp, stcb, asoc);
9987                         return;
9988                 }
9989                 if (ret < 0) {
9990                         /*-
9991                          * The count was off.. retran is not happening so do
9992                          * the normal retransmission.
9993                          */
9994 #ifdef SCTP_AUDITING_ENABLED
9995                         sctp_auditing(9, inp, stcb, NULL);
9996 #endif
9997                         if (ret == SCTP_RETRAN_EXIT) {
9998                                 return;
9999                         }
10000                         break;
10001                 }
10002                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10003                         /* Only one transmission allowed out of a timeout */
10004 #ifdef SCTP_AUDITING_ENABLED
10005                         sctp_auditing(10, inp, stcb, NULL);
10006 #endif
10007                         /* Push out any control */
10008                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10009                             &now, &now_filled, frag_point, so_locked);
10010                         return;
10011                 }
10012                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10013                         /* Hit FR burst limit */
10014                         return;
10015                 }
10016                 if ((num_out == 0) && (ret == 0)) {
10017                         /* No more retrans to send */
10018                         break;
10019                 }
10020         }
10021 #ifdef SCTP_AUDITING_ENABLED
10022         sctp_auditing(12, inp, stcb, NULL);
10023 #endif
10024         /* Check for bad destinations, if they exist move chunks around. */
10025         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10026                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10027                         /*-
10028                          * if possible move things off of this address we
10029                          * still may send below due to the dormant state but
10030                          * we try to find an alternate address to send to
10031                          * and if we have one we move all queued data on the
10032                          * out wheel to this alternate address.
10033                          */
10034                         if (net->ref_count > 1)
10035                                 sctp_move_chunks_from_net(stcb, net);
10036                 } else {
10037                         /*-
10038                          * if ((asoc->sat_network) || (net->addr_is_local))
10039                          * { burst_limit = asoc->max_burst *
10040                          * SCTP_SAT_NETWORK_BURST_INCR; }
10041                          */
10042                         if (asoc->max_burst > 0) {
10043                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10044                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10045                                                 /*
10046                                                  * JRS - Use the congestion
10047                                                  * control given in the
10048                                                  * congestion control module
10049                                                  */
10050                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10051                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10052                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10053                                                 }
10054                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10055                                         }
10056                                         net->fast_retran_ip = 0;
10057                                 } else {
10058                                         if (net->flight_size == 0) {
10059                                                 /*
10060                                                  * Should be decaying the
10061                                                  * cwnd here
10062                                                  */
10063                                                 ;
10064                                         }
10065                                 }
10066                         }
10067                 }
10068
10069         }
10070         burst_cnt = 0;
10071         do {
10072                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10073                     &reason_code, 0, from_where,
10074                     &now, &now_filled, frag_point, so_locked);
10075                 if (error) {
10076                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10077                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10078                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10079                         }
10080                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10081                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10082                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10083                         }
10084                         break;
10085                 }
10086                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10087
10088                 tot_out += num_out;
10089                 burst_cnt++;
10090                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10091                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10092                         if (num_out == 0) {
10093                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10094                         }
10095                 }
10096                 if (nagle_on) {
10097                         /*
10098                          * When the Nagle algorithm is used, look at how
10099                          * much is unsent, then if its smaller than an MTU
10100                          * and we have data in flight we stop, except if we
10101                          * are handling a fragmented user message.
10102                          */
10103                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10104                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10105                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10106                             (stcb->asoc.total_flight > 0) &&
10107                             ((stcb->asoc.locked_on_sending == NULL) ||
10108                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10109                                 break;
10110                         }
10111                 }
10112                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10113                     TAILQ_EMPTY(&asoc->send_queue) &&
10114                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10115                         /* Nothing left to send */
10116                         break;
10117                 }
10118                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10119                         /* Nothing left to send */
10120                         break;
10121                 }
10122         } while (num_out &&
10123             ((asoc->max_burst == 0) ||
10124             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10125             (burst_cnt < asoc->max_burst)));
10126
10127         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10128                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10129                         SCTP_STAT_INCR(sctps_maxburstqueued);
10130                         asoc->burst_limit_applied = 1;
10131                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10132                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10133                         }
10134                 } else {
10135                         asoc->burst_limit_applied = 0;
10136                 }
10137         }
10138         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10139                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10140         }
10141         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10142             tot_out);
10143
10144         /*-
10145          * Now we need to clean up the control chunk chain if a ECNE is on
10146          * it. It must be marked as UNSENT again so next call will continue
10147          * to send it until such time that we get a CWR, to remove it.
10148          */
10149         if (stcb->asoc.ecn_echo_cnt_onq)
10150                 sctp_fix_ecn_echo(asoc);
10151         return;
10152 }
10153
10154
10155 int
10156 sctp_output(
10157     struct sctp_inpcb *inp,
10158     struct mbuf *m,
10159     struct sockaddr *addr,
10160     struct mbuf *control,
10161     struct thread *p,
10162     int flags)
10163 {
10164         if (inp == NULL) {
10165                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10166                 return (EINVAL);
10167         }
10168         if (inp->sctp_socket == NULL) {
10169                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10170                 return (EINVAL);
10171         }
10172         return (sctp_sosend(inp->sctp_socket,
10173             addr,
10174             (struct uio *)NULL,
10175             m,
10176             control,
10177             flags, p
10178             ));
10179 }
10180
10181 void
10182 send_forward_tsn(struct sctp_tcb *stcb,
10183     struct sctp_association *asoc)
10184 {
10185         struct sctp_tmit_chunk *chk;
10186         struct sctp_forward_tsn_chunk *fwdtsn;
10187         uint32_t advance_peer_ack_point;
10188
10189         SCTP_TCB_LOCK_ASSERT(stcb);
10190         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10191                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10192                         /* mark it to unsent */
10193                         chk->sent = SCTP_DATAGRAM_UNSENT;
10194                         chk->snd_count = 0;
10195                         /* Do we correct its output location? */
10196                         if (chk->whoTo) {
10197                                 sctp_free_remote_addr(chk->whoTo);
10198                                 chk->whoTo = NULL;
10199                         }
10200                         goto sctp_fill_in_rest;
10201                 }
10202         }
10203         /* Ok if we reach here we must build one */
10204         sctp_alloc_a_chunk(stcb, chk);
10205         if (chk == NULL) {
10206                 return;
10207         }
10208         asoc->fwd_tsn_cnt++;
10209         chk->copy_by_ref = 0;
10210         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10211         chk->rec.chunk_id.can_take_data = 0;
10212         chk->asoc = asoc;
10213         chk->whoTo = NULL;
10214         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10215         if (chk->data == NULL) {
10216                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10217                 return;
10218         }
10219         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10220         chk->sent = SCTP_DATAGRAM_UNSENT;
10221         chk->snd_count = 0;
10222         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10223         asoc->ctrl_queue_cnt++;
10224 sctp_fill_in_rest:
10225         /*-
10226          * Here we go through and fill out the part that deals with
10227          * stream/seq of the ones we skip.
10228          */
10229         SCTP_BUF_LEN(chk->data) = 0;
10230         {
10231                 struct sctp_tmit_chunk *at, *tp1, *last;
10232                 struct sctp_strseq *strseq;
10233                 unsigned int cnt_of_space, i, ovh;
10234                 unsigned int space_needed;
10235                 unsigned int cnt_of_skipped = 0;
10236
10237                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10238                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10239                                 /* no more to look at */
10240                                 break;
10241                         }
10242                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10243                                 /* We don't report these */
10244                                 continue;
10245                         }
10246                         cnt_of_skipped++;
10247                 }
10248                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10249                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10250
10251                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10252
10253                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10254                         ovh = SCTP_MIN_OVERHEAD;
10255                 } else {
10256                         ovh = SCTP_MIN_V4_OVERHEAD;
10257                 }
10258                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10259                         /* trim to a mtu size */
10260                         cnt_of_space = asoc->smallest_mtu - ovh;
10261                 }
10262                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10263                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10264                             0xff, 0, cnt_of_skipped,
10265                             asoc->advanced_peer_ack_point);
10266
10267                 }
10268                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10269                 if (cnt_of_space < space_needed) {
10270                         /*-
10271                          * ok we must trim down the chunk by lowering the
10272                          * advance peer ack point.
10273                          */
10274                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10275                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10276                                     0xff, 0xff, cnt_of_space,
10277                                     space_needed);
10278                         }
10279                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10280                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10281                         /*-
10282                          * Go through and find the TSN that will be the one
10283                          * we report.
10284                          */
10285                         at = TAILQ_FIRST(&asoc->sent_queue);
10286                         if (at != NULL) {
10287                                 for (i = 0; i < cnt_of_skipped; i++) {
10288                                         tp1 = TAILQ_NEXT(at, sctp_next);
10289                                         if (tp1 == NULL) {
10290                                                 break;
10291                                         }
10292                                         at = tp1;
10293                                 }
10294                         }
10295                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10296                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10297                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10298                                     asoc->advanced_peer_ack_point);
10299                         }
10300                         last = at;
10301                         /*-
10302                          * last now points to last one I can report, update
10303                          * peer ack point
10304                          */
10305                         if (last)
10306                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10307                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10308                             cnt_of_skipped * sizeof(struct sctp_strseq);
10309                 }
10310                 chk->send_size = space_needed;
10311                 /* Setup the chunk */
10312                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10313                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10314                 fwdtsn->ch.chunk_flags = 0;
10315                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10316                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10317                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10318                 fwdtsn++;
10319                 /*-
10320                  * Move pointer to after the fwdtsn and transfer to the
10321                  * strseq pointer.
10322                  */
10323                 strseq = (struct sctp_strseq *)fwdtsn;
10324                 /*-
10325                  * Now populate the strseq list. This is done blindly
10326                  * without pulling out duplicate stream info. This is
10327                  * inefficent but won't harm the process since the peer will
10328                  * look at these in sequence and will thus release anything.
10329                  * It could mean we exceed the PMTU and chop off some that
10330                  * we could have included.. but this is unlikely (aka 1432/4
10331                  * would mean 300+ stream seq's would have to be reported in
10332                  * one FWD-TSN. With a bit of work we can later FIX this to
10333                  * optimize and pull out duplcates.. but it does add more
10334                  * overhead. So for now... not!
10335                  */
10336                 at = TAILQ_FIRST(&asoc->sent_queue);
10337                 for (i = 0; i < cnt_of_skipped; i++) {
10338                         tp1 = TAILQ_NEXT(at, sctp_next);
10339                         if (tp1 == NULL)
10340                                 break;
10341                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10342                                 /* We don't report these */
10343                                 i--;
10344                                 at = tp1;
10345                                 continue;
10346                         }
10347                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10348                                 at->rec.data.fwd_tsn_cnt = 0;
10349                         }
10350                         strseq->stream = ntohs(at->rec.data.stream_number);
10351                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10352                         strseq++;
10353                         at = tp1;
10354                 }
10355         }
10356         return;
10357 }
10358
10359 void
10360 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10361 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10362     SCTP_UNUSED
10363 #endif
10364 )
10365 {
10366         /*-
10367          * Queue up a SACK or NR-SACK in the control queue.
10368          * We must first check to see if a SACK or NR-SACK is
10369          * somehow on the control queue.
10370          * If so, we will take and and remove the old one.
10371          */
10372         struct sctp_association *asoc;
10373         struct sctp_tmit_chunk *chk, *a_chk;
10374         struct sctp_sack_chunk *sack;
10375         struct sctp_nr_sack_chunk *nr_sack;
10376         struct sctp_gap_ack_block *gap_descriptor;
10377         struct sack_track *selector;
10378         int mergeable = 0;
10379         int offset;
10380         caddr_t limit;
10381         uint32_t *dup;
10382         int limit_reached = 0;
10383         unsigned int i, siz, j;
10384         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10385         int num_dups = 0;
10386         int space_req;
10387         uint32_t highest_tsn;
10388         uint8_t flags;
10389         uint8_t type;
10390         uint8_t tsn_map;
10391
10392         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10393             (stcb->asoc.peer_supports_nr_sack == 1)) {
10394                 type = SCTP_NR_SELECTIVE_ACK;
10395         } else {
10396                 type = SCTP_SELECTIVE_ACK;
10397         }
10398         a_chk = NULL;
10399         asoc = &stcb->asoc;
10400         SCTP_TCB_LOCK_ASSERT(stcb);
10401         if (asoc->last_data_chunk_from == NULL) {
10402                 /* Hmm we never received anything */
10403                 return;
10404         }
10405         sctp_slide_mapping_arrays(stcb);
10406         sctp_set_rwnd(stcb, asoc);
10407         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10408                 if (chk->rec.chunk_id.id == type) {
10409                         /* Hmm, found a sack already on queue, remove it */
10410                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10411                         asoc->ctrl_queue_cnt--;
10412                         a_chk = chk;
10413                         if (a_chk->data) {
10414                                 sctp_m_freem(a_chk->data);
10415                                 a_chk->data = NULL;
10416                         }
10417                         if (a_chk->whoTo) {
10418                                 sctp_free_remote_addr(a_chk->whoTo);
10419                                 a_chk->whoTo = NULL;
10420                         }
10421                         break;
10422                 }
10423         }
10424         if (a_chk == NULL) {
10425                 sctp_alloc_a_chunk(stcb, a_chk);
10426                 if (a_chk == NULL) {
10427                         /* No memory so we drop the idea, and set a timer */
10428                         if (stcb->asoc.delayed_ack) {
10429                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10430                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10431                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10432                                     stcb->sctp_ep, stcb, NULL);
10433                         } else {
10434                                 stcb->asoc.send_sack = 1;
10435                         }
10436                         return;
10437                 }
10438                 a_chk->copy_by_ref = 0;
10439                 a_chk->rec.chunk_id.id = type;
10440                 a_chk->rec.chunk_id.can_take_data = 1;
10441         }
10442         /* Clear our pkt counts */
10443         asoc->data_pkts_seen = 0;
10444
10445         a_chk->asoc = asoc;
10446         a_chk->snd_count = 0;
10447         a_chk->send_size = 0;   /* fill in later */
10448         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10449         a_chk->whoTo = NULL;
10450
10451         if ((asoc->numduptsns) ||
10452             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10453                 /*-
10454                  * Ok, we have some duplicates or the destination for the
10455                  * sack is unreachable, lets see if we can select an
10456                  * alternate than asoc->last_data_chunk_from
10457                  */
10458                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10459                     (asoc->used_alt_onsack > asoc->numnets)) {
10460                         /* We used an alt last time, don't this time */
10461                         a_chk->whoTo = NULL;
10462                 } else {
10463                         asoc->used_alt_onsack++;
10464                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10465                 }
10466                 if (a_chk->whoTo == NULL) {
10467                         /* Nope, no alternate */
10468                         a_chk->whoTo = asoc->last_data_chunk_from;
10469                         asoc->used_alt_onsack = 0;
10470                 }
10471         } else {
10472                 /*
10473                  * No duplicates so we use the last place we received data
10474                  * from.
10475                  */
10476                 asoc->used_alt_onsack = 0;
10477                 a_chk->whoTo = asoc->last_data_chunk_from;
10478         }
10479         if (a_chk->whoTo) {
10480                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10481         }
10482         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10483                 highest_tsn = asoc->highest_tsn_inside_map;
10484         } else {
10485                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10486         }
10487         if (highest_tsn == asoc->cumulative_tsn) {
10488                 /* no gaps */
10489                 if (type == SCTP_SELECTIVE_ACK) {
10490                         space_req = sizeof(struct sctp_sack_chunk);
10491                 } else {
10492                         space_req = sizeof(struct sctp_nr_sack_chunk);
10493                 }
10494         } else {
10495                 /* gaps get a cluster */
10496                 space_req = MCLBYTES;
10497         }
10498         /* Ok now lets formulate a MBUF with our sack */
10499         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10500         if ((a_chk->data == NULL) ||
10501             (a_chk->whoTo == NULL)) {
10502                 /* rats, no mbuf memory */
10503                 if (a_chk->data) {
10504                         /* was a problem with the destination */
10505                         sctp_m_freem(a_chk->data);
10506                         a_chk->data = NULL;
10507                 }
10508                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10509                 /* sa_ignore NO_NULL_CHK */
10510                 if (stcb->asoc.delayed_ack) {
10511                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10512                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10513                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10514                             stcb->sctp_ep, stcb, NULL);
10515                 } else {
10516                         stcb->asoc.send_sack = 1;
10517                 }
10518                 return;
10519         }
10520         /* ok, lets go through and fill it in */
10521         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10522         space = M_TRAILINGSPACE(a_chk->data);
10523         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10524                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10525         }
10526         limit = mtod(a_chk->data, caddr_t);
10527         limit += space;
10528
10529         flags = 0;
10530
10531         if ((asoc->sctp_cmt_on_off > 0) &&
10532             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10533                 /*-
10534                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10535                  * received, then set high bit to 1, else 0. Reset
10536                  * pkts_rcvd.
10537                  */
10538                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10539                 asoc->cmt_dac_pkts_rcvd = 0;
10540         }
10541 #ifdef SCTP_ASOCLOG_OF_TSNS
10542         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10543         stcb->asoc.cumack_log_atsnt++;
10544         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10545                 stcb->asoc.cumack_log_atsnt = 0;
10546         }
10547 #endif
10548         /* reset the readers interpretation */
10549         stcb->freed_by_sorcv_sincelast = 0;
10550
10551         if (type == SCTP_SELECTIVE_ACK) {
10552                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10553                 nr_sack = NULL;
10554                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10555                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10556                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10557                 } else {
10558                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10559                 }
10560         } else {
10561                 sack = NULL;
10562                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10563                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10564                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10565                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10566                 } else {
10567                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10568                 }
10569         }
10570
10571         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10572                 offset = 1;
10573         } else {
10574                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10575         }
10576         if (((type == SCTP_SELECTIVE_ACK) &&
10577             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10578             ((type == SCTP_NR_SELECTIVE_ACK) &&
10579             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10580                 /* we have a gap .. maybe */
10581                 for (i = 0; i < siz; i++) {
10582                         tsn_map = asoc->mapping_array[i];
10583                         if (type == SCTP_SELECTIVE_ACK) {
10584                                 tsn_map |= asoc->nr_mapping_array[i];
10585                         }
10586                         if (i == 0) {
10587                                 /*
10588                                  * Clear all bits corresponding to TSNs
10589                                  * smaller or equal to the cumulative TSN.
10590                                  */
10591                                 tsn_map &= (~0 << (1 - offset));
10592                         }
10593                         selector = &sack_array[tsn_map];
10594                         if (mergeable && selector->right_edge) {
10595                                 /*
10596                                  * Backup, left and right edges were ok to
10597                                  * merge.
10598                                  */
10599                                 num_gap_blocks--;
10600                                 gap_descriptor--;
10601                         }
10602                         if (selector->num_entries == 0)
10603                                 mergeable = 0;
10604                         else {
10605                                 for (j = 0; j < selector->num_entries; j++) {
10606                                         if (mergeable && selector->right_edge) {
10607                                                 /*
10608                                                  * do a merge by NOT setting
10609                                                  * the left side
10610                                                  */
10611                                                 mergeable = 0;
10612                                         } else {
10613                                                 /*
10614                                                  * no merge, set the left
10615                                                  * 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_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         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10641             (limit_reached == 0)) {
10642
10643                 mergeable = 0;
10644
10645                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10646                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10647                 } else {
10648                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10649                 }
10650
10651                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10652                         offset = 1;
10653                 } else {
10654                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10655                 }
10656                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10657                         /* we have a gap .. maybe */
10658                         for (i = 0; i < siz; i++) {
10659                                 tsn_map = asoc->nr_mapping_array[i];
10660                                 if (i == 0) {
10661                                         /*
10662                                          * Clear all bits corresponding to
10663                                          * TSNs smaller or equal to the
10664                                          * cumulative TSN.
10665                                          */
10666                                         tsn_map &= (~0 << (1 - offset));
10667                                 }
10668                                 selector = &sack_array[tsn_map];
10669                                 if (mergeable && selector->right_edge) {
10670                                         /*
10671                                          * Backup, left and right edges were
10672                                          * ok to merge.
10673                                          */
10674                                         num_nr_gap_blocks--;
10675                                         gap_descriptor--;
10676                                 }
10677                                 if (selector->num_entries == 0)
10678                                         mergeable = 0;
10679                                 else {
10680                                         for (j = 0; j < selector->num_entries; j++) {
10681                                                 if (mergeable && selector->right_edge) {
10682                                                         /*
10683                                                          * do a merge by NOT
10684                                                          * setting the left
10685                                                          * side
10686                                                          */
10687                                                         mergeable = 0;
10688                                                 } else {
10689                                                         /*
10690                                                          * no merge, set the
10691                                                          * left side
10692                                                          */
10693                                                         mergeable = 0;
10694                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10695                                                 }
10696                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10697                                                 num_nr_gap_blocks++;
10698                                                 gap_descriptor++;
10699                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10700                                                         /* no more room */
10701                                                         limit_reached = 1;
10702                                                         break;
10703                                                 }
10704                                         }
10705                                         if (selector->left_edge) {
10706                                                 mergeable = 1;
10707                                         }
10708                                 }
10709                                 if (limit_reached) {
10710                                         /* Reached the limit stop */
10711                                         break;
10712                                 }
10713                                 offset += 8;
10714                         }
10715                 }
10716         }
10717         /* now we must add any dups we are going to report. */
10718         if ((limit_reached == 0) && (asoc->numduptsns)) {
10719                 dup = (uint32_t *) gap_descriptor;
10720                 for (i = 0; i < asoc->numduptsns; i++) {
10721                         *dup = htonl(asoc->dup_tsns[i]);
10722                         dup++;
10723                         num_dups++;
10724                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10725                                 /* no more room */
10726                                 break;
10727                         }
10728                 }
10729                 asoc->numduptsns = 0;
10730         }
10731         /*
10732          * now that the chunk is prepared queue it to the control chunk
10733          * queue.
10734          */
10735         if (type == SCTP_SELECTIVE_ACK) {
10736                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10737                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10738                     num_dups * sizeof(int32_t);
10739                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10740                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10741                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10742                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10743                 sack->sack.num_dup_tsns = htons(num_dups);
10744                 sack->ch.chunk_type = type;
10745                 sack->ch.chunk_flags = flags;
10746                 sack->ch.chunk_length = htons(a_chk->send_size);
10747         } else {
10748                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10749                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10750                     num_dups * sizeof(int32_t);
10751                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10752                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10753                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10754                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10755                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10756                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10757                 nr_sack->nr_sack.reserved = 0;
10758                 nr_sack->ch.chunk_type = type;
10759                 nr_sack->ch.chunk_flags = flags;
10760                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10761         }
10762         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10763         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10764         asoc->ctrl_queue_cnt++;
10765         asoc->send_sack = 0;
10766         SCTP_STAT_INCR(sctps_sendsacks);
10767         return;
10768 }
10769
10770 void
10771 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10772 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10773     SCTP_UNUSED
10774 #endif
10775 )
10776 {
10777         struct mbuf *m_abort;
10778         struct mbuf *m_out = NULL, *m_end = NULL;
10779         struct sctp_abort_chunk *abort = NULL;
10780         int sz;
10781         uint32_t auth_offset = 0;
10782         struct sctp_auth_chunk *auth = NULL;
10783         struct sctp_nets *net;
10784
10785         /*-
10786          * Add an AUTH chunk, if chunk requires it and save the offset into
10787          * the chain for AUTH
10788          */
10789         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10790             stcb->asoc.peer_auth_chunks)) {
10791                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10792                     stcb, SCTP_ABORT_ASSOCIATION);
10793                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10794         }
10795         SCTP_TCB_LOCK_ASSERT(stcb);
10796         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10797         if (m_abort == NULL) {
10798                 /* no mbuf's */
10799                 if (m_out)
10800                         sctp_m_freem(m_out);
10801                 return;
10802         }
10803         /* link in any error */
10804         SCTP_BUF_NEXT(m_abort) = operr;
10805         sz = 0;
10806         if (operr) {
10807                 struct mbuf *n;
10808
10809                 n = operr;
10810                 while (n) {
10811                         sz += SCTP_BUF_LEN(n);
10812                         n = SCTP_BUF_NEXT(n);
10813                 }
10814         }
10815         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10816         if (m_out == NULL) {
10817                 /* NO Auth chunk prepended, so reserve space in front */
10818                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10819                 m_out = m_abort;
10820         } else {
10821                 /* Put AUTH chunk at the front of the chain */
10822                 SCTP_BUF_NEXT(m_end) = m_abort;
10823         }
10824         if (stcb->asoc.alternate) {
10825                 net = stcb->asoc.alternate;
10826         } else {
10827                 net = stcb->asoc.primary_destination;
10828         }
10829         /* fill in the ABORT chunk */
10830         abort = mtod(m_abort, struct sctp_abort_chunk *);
10831         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10832         abort->ch.chunk_flags = 0;
10833         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10834
10835         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10836             (struct sockaddr *)&net->ro._l_addr,
10837             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10838             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10839             stcb->asoc.primary_destination->port, NULL,
10840             0, 0,
10841             so_locked);
10842         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10843 }
10844
10845 void
10846 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10847     struct sctp_nets *net,
10848     int reflect_vtag)
10849 {
10850         /* formulate and SEND a SHUTDOWN-COMPLETE */
10851         struct mbuf *m_shutdown_comp;
10852         struct sctp_shutdown_complete_chunk *shutdown_complete;
10853         uint32_t vtag;
10854         uint8_t flags;
10855
10856         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10857         if (m_shutdown_comp == NULL) {
10858                 /* no mbuf's */
10859                 return;
10860         }
10861         if (reflect_vtag) {
10862                 flags = SCTP_HAD_NO_TCB;
10863                 vtag = stcb->asoc.my_vtag;
10864         } else {
10865                 flags = 0;
10866                 vtag = stcb->asoc.peer_vtag;
10867         }
10868         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10869         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10870         shutdown_complete->ch.chunk_flags = flags;
10871         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10872         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10873         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10874             (struct sockaddr *)&net->ro._l_addr,
10875             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10876             stcb->sctp_ep->sctp_lport, stcb->rport,
10877             htonl(vtag),
10878             net->port, NULL,
10879             0, 0,
10880             SCTP_SO_NOT_LOCKED);
10881         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10882         return;
10883 }
10884
10885 static void
10886 sctp_send_resp_msg(struct mbuf *m, struct sctphdr *sh, uint32_t vtag,
10887     uint8_t type, struct mbuf *cause,
10888     uint8_t use_mflowid, uint32_t mflowid,
10889     uint32_t vrf_id, uint16_t port)
10890 {
10891         struct mbuf *o_pak;
10892         struct mbuf *mout;
10893         struct sctphdr *shout;
10894         struct sctp_chunkhdr *ch;
10895         struct ip *iph;
10896         struct udphdr *udp;
10897         int len, cause_len, padding_len, ret;
10898
10899 #ifdef INET
10900         struct ip *iph_out;
10901
10902 #endif
10903 #ifdef INET6
10904         struct ip6_hdr *ip6, *ip6_out;
10905
10906 #endif
10907
10908         /* Compute the length of the cause and add final padding. */
10909         cause_len = 0;
10910         if (cause != NULL) {
10911                 struct mbuf *m_at, *m_last = NULL;
10912
10913                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10914                         if (SCTP_BUF_NEXT(m_at) == NULL)
10915                                 m_last = m_at;
10916                         cause_len += SCTP_BUF_LEN(m_at);
10917                 }
10918                 padding_len = cause_len % 4;
10919                 if (padding_len != 0) {
10920                         padding_len = 4 - padding_len;
10921                 }
10922                 if (padding_len != 0) {
10923                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10924                                 sctp_m_freem(cause);
10925                                 return;
10926                         }
10927                 }
10928         } else {
10929                 padding_len = 0;
10930         }
10931         /* Get an mbuf for the header. */
10932         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10933         iph = mtod(m, struct ip *);
10934         switch (iph->ip_v) {
10935 #ifdef INET
10936         case IPVERSION:
10937                 len += sizeof(struct ip);
10938                 break;
10939 #endif
10940 #ifdef INET6
10941         case IPV6_VERSION >> 4:
10942                 len += sizeof(struct ip6_hdr);
10943                 break;
10944 #endif
10945         default:
10946                 break;
10947         }
10948         if (port) {
10949                 len += sizeof(struct udphdr);
10950         }
10951         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10952         if (mout == NULL) {
10953                 if (cause) {
10954                         sctp_m_freem(cause);
10955                 }
10956                 return;
10957         }
10958         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10959         SCTP_BUF_LEN(mout) = len;
10960         SCTP_BUF_NEXT(mout) = cause;
10961         if (use_mflowid != 0) {
10962                 mout->m_pkthdr.flowid = mflowid;
10963                 mout->m_flags |= M_FLOWID;
10964         }
10965 #ifdef INET
10966         iph_out = NULL;
10967 #endif
10968 #ifdef INET6
10969         ip6_out = NULL;
10970 #endif
10971         switch (iph->ip_v) {
10972 #ifdef INET
10973         case IPVERSION:
10974                 iph_out = mtod(mout, struct ip *);
10975                 iph_out->ip_v = IPVERSION;
10976                 iph_out->ip_hl = (sizeof(struct ip) >> 2);
10977                 iph_out->ip_tos = 0;
10978                 iph_out->ip_id = ip_newid();
10979                 iph_out->ip_off = 0;
10980                 iph_out->ip_ttl = MODULE_GLOBAL(ip_defttl);
10981                 if (port) {
10982                         iph_out->ip_p = IPPROTO_UDP;
10983                 } else {
10984                         iph_out->ip_p = IPPROTO_SCTP;
10985                 }
10986                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10987                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10988                 iph_out->ip_sum = 0;
10989                 len = sizeof(struct ip);
10990                 shout = (struct sctphdr *)((caddr_t)iph_out + len);
10991                 break;
10992 #endif
10993 #ifdef INET6
10994         case IPV6_VERSION >> 4:
10995                 ip6 = (struct ip6_hdr *)iph;
10996                 ip6_out = mtod(mout, struct ip6_hdr *);
10997                 ip6_out->ip6_flow = htonl(0x60000000);
10998                 if (V_ip6_auto_flowlabel) {
10999                         ip6_out->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11000                 }
11001                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11002                 if (port) {
11003                         ip6_out->ip6_nxt = IPPROTO_UDP;
11004                 } else {
11005                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11006                 }
11007                 ip6_out->ip6_src = ip6->ip6_dst;
11008                 ip6_out->ip6_dst = ip6->ip6_src;
11009                 len = sizeof(struct ip6_hdr);
11010                 shout = (struct sctphdr *)((caddr_t)ip6_out + len);
11011                 break;
11012 #endif
11013         default:
11014                 len = 0;
11015                 shout = mtod(mout, struct sctphdr *);
11016                 break;
11017         }
11018         if (port) {
11019                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11020                         sctp_m_freem(mout);
11021                         return;
11022                 }
11023                 udp = (struct udphdr *)shout;
11024                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11025                 udp->uh_dport = port;
11026                 udp->uh_sum = 0;
11027                 udp->uh_ulen = htons(sizeof(struct udphdr) +
11028                     sizeof(struct sctphdr) +
11029                     sizeof(struct sctp_chunkhdr) +
11030                     cause_len + padding_len);
11031                 len += sizeof(struct udphdr);
11032                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11033         } else {
11034                 udp = NULL;
11035         }
11036         shout->src_port = sh->dest_port;
11037         shout->dest_port = sh->src_port;
11038         shout->checksum = 0;
11039         if (vtag) {
11040                 shout->v_tag = htonl(vtag);
11041         } else {
11042                 shout->v_tag = sh->v_tag;
11043         }
11044         len += sizeof(struct sctphdr);
11045         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11046         ch->chunk_type = type;
11047         if (vtag) {
11048                 ch->chunk_flags = 0;
11049         } else {
11050                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11051         }
11052         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11053         len += sizeof(struct sctp_chunkhdr);
11054         len += cause_len + padding_len;
11055
11056         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11057                 sctp_m_freem(mout);
11058                 return;
11059         }
11060         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11061 #ifdef INET
11062         if (iph_out != NULL) {
11063                 if (port) {
11064                         if (V_udp_cksum) {
11065                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11066                         } else {
11067                                 udp->uh_sum = 0;
11068                         }
11069                 }
11070                 iph_out->ip_len = len;
11071                 if (port) {
11072 #if defined(SCTP_WITH_NO_CSUM)
11073                         SCTP_STAT_INCR(sctps_sendnocrc);
11074 #else
11075                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11076                         SCTP_STAT_INCR(sctps_sendswcrc);
11077 #endif
11078                         if (V_udp_cksum) {
11079                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11080                         }
11081                 } else {
11082 #if defined(SCTP_WITH_NO_CSUM)
11083                         SCTP_STAT_INCR(sctps_sendnocrc);
11084 #else
11085                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11086                         mout->m_pkthdr.csum_data = 0;
11087                         SCTP_STAT_INCR(sctps_sendhwcrc);
11088 #endif
11089                 }
11090 #ifdef SCTP_PACKET_LOGGING
11091                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11092                         sctp_packet_log(o_pak);
11093                 }
11094 #endif
11095                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11096         }
11097 #endif
11098 #ifdef INET6
11099         if (ip6_out != NULL) {
11100                 ip6_out->ip6_plen = len - sizeof(struct ip6_hdr);
11101                 if (port) {
11102 #if defined(SCTP_WITH_NO_CSUM)
11103                         SCTP_STAT_INCR(sctps_sendnocrc);
11104 #else
11105                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11106                         SCTP_STAT_INCR(sctps_sendswcrc);
11107 #endif
11108                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11109                                 udp->uh_sum = 0xffff;
11110                         }
11111                 } else {
11112 #if defined(SCTP_WITH_NO_CSUM)
11113                         SCTP_STAT_INCR(sctps_sendnocrc);
11114 #else
11115                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11116                         mout->m_pkthdr.csum_data = 0;
11117                         SCTP_STAT_INCR(sctps_sendhwcrc);
11118 #endif
11119                 }
11120 #ifdef SCTP_PACKET_LOGGING
11121                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11122                         sctp_packet_log(o_pak);
11123                 }
11124 #endif
11125                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11126         }
11127 #endif
11128         SCTP_STAT_INCR(sctps_sendpackets);
11129         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11130         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11131         return;
11132 }
11133
11134 void
11135 sctp_send_shutdown_complete2(struct mbuf *m, struct sctphdr *sh,
11136     uint8_t use_mflowid, uint32_t mflowid,
11137     uint32_t vrf_id, uint16_t port)
11138 {
11139         sctp_send_resp_msg(m, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11140             use_mflowid, mflowid,
11141             vrf_id, port);
11142 }
11143
11144 void
11145 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11146 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11147     SCTP_UNUSED
11148 #endif
11149 )
11150 {
11151         struct sctp_tmit_chunk *chk;
11152         struct sctp_heartbeat_chunk *hb;
11153         struct timeval now;
11154
11155         SCTP_TCB_LOCK_ASSERT(stcb);
11156         if (net == NULL) {
11157                 return;
11158         }
11159         (void)SCTP_GETTIME_TIMEVAL(&now);
11160         switch (net->ro._l_addr.sa.sa_family) {
11161 #ifdef INET
11162         case AF_INET:
11163                 break;
11164 #endif
11165 #ifdef INET6
11166         case AF_INET6:
11167                 break;
11168 #endif
11169         default:
11170                 return;
11171         }
11172         sctp_alloc_a_chunk(stcb, chk);
11173         if (chk == NULL) {
11174                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11175                 return;
11176         }
11177         chk->copy_by_ref = 0;
11178         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11179         chk->rec.chunk_id.can_take_data = 1;
11180         chk->asoc = &stcb->asoc;
11181         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11182
11183         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11184         if (chk->data == NULL) {
11185                 sctp_free_a_chunk(stcb, chk, so_locked);
11186                 return;
11187         }
11188         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11189         SCTP_BUF_LEN(chk->data) = chk->send_size;
11190         chk->sent = SCTP_DATAGRAM_UNSENT;
11191         chk->snd_count = 0;
11192         chk->whoTo = net;
11193         atomic_add_int(&chk->whoTo->ref_count, 1);
11194         /* Now we have a mbuf that we can fill in with the details */
11195         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11196         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11197         /* fill out chunk header */
11198         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11199         hb->ch.chunk_flags = 0;
11200         hb->ch.chunk_length = htons(chk->send_size);
11201         /* Fill out hb parameter */
11202         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11203         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11204         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11205         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11206         /* Did our user request this one, put it in */
11207         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11208         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11209         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11210                 /*
11211                  * we only take from the entropy pool if the address is not
11212                  * confirmed.
11213                  */
11214                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11215                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11216         } else {
11217                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11218                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11219         }
11220         switch (net->ro._l_addr.sa.sa_family) {
11221 #ifdef INET
11222         case AF_INET:
11223                 memcpy(hb->heartbeat.hb_info.address,
11224                     &net->ro._l_addr.sin.sin_addr,
11225                     sizeof(net->ro._l_addr.sin.sin_addr));
11226                 break;
11227 #endif
11228 #ifdef INET6
11229         case AF_INET6:
11230                 memcpy(hb->heartbeat.hb_info.address,
11231                     &net->ro._l_addr.sin6.sin6_addr,
11232                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11233                 break;
11234 #endif
11235         default:
11236                 return;
11237                 break;
11238         }
11239         net->hb_responded = 0;
11240         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11241         stcb->asoc.ctrl_queue_cnt++;
11242         SCTP_STAT_INCR(sctps_sendheartbeat);
11243         return;
11244 }
11245
11246 void
11247 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11248     uint32_t high_tsn)
11249 {
11250         struct sctp_association *asoc;
11251         struct sctp_ecne_chunk *ecne;
11252         struct sctp_tmit_chunk *chk;
11253
11254         if (net == NULL) {
11255                 return;
11256         }
11257         asoc = &stcb->asoc;
11258         SCTP_TCB_LOCK_ASSERT(stcb);
11259         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11260                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11261                         /* found a previous ECN_ECHO update it if needed */
11262                         uint32_t cnt, ctsn;
11263
11264                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11265                         ctsn = ntohl(ecne->tsn);
11266                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11267                                 ecne->tsn = htonl(high_tsn);
11268                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11269                         }
11270                         cnt = ntohl(ecne->num_pkts_since_cwr);
11271                         cnt++;
11272                         ecne->num_pkts_since_cwr = htonl(cnt);
11273                         return;
11274                 }
11275         }
11276         /* nope could not find one to update so we must build one */
11277         sctp_alloc_a_chunk(stcb, chk);
11278         if (chk == NULL) {
11279                 return;
11280         }
11281         chk->copy_by_ref = 0;
11282         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11283         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11284         chk->rec.chunk_id.can_take_data = 0;
11285         chk->asoc = &stcb->asoc;
11286         chk->send_size = sizeof(struct sctp_ecne_chunk);
11287         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11288         if (chk->data == NULL) {
11289                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11290                 return;
11291         }
11292         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11293         SCTP_BUF_LEN(chk->data) = chk->send_size;
11294         chk->sent = SCTP_DATAGRAM_UNSENT;
11295         chk->snd_count = 0;
11296         chk->whoTo = net;
11297         atomic_add_int(&chk->whoTo->ref_count, 1);
11298
11299         stcb->asoc.ecn_echo_cnt_onq++;
11300         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11301         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11302         ecne->ch.chunk_flags = 0;
11303         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11304         ecne->tsn = htonl(high_tsn);
11305         ecne->num_pkts_since_cwr = htonl(1);
11306         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11307         asoc->ctrl_queue_cnt++;
11308 }
11309
11310 void
11311 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11312     struct mbuf *m, int len, int iphlen, int bad_crc)
11313 {
11314         struct sctp_association *asoc;
11315         struct sctp_pktdrop_chunk *drp;
11316         struct sctp_tmit_chunk *chk;
11317         uint8_t *datap;
11318         int was_trunc = 0;
11319         struct ip *iph;
11320         int fullsz = 0;
11321         long spc;
11322         int offset;
11323         struct sctp_chunkhdr *ch, chunk_buf;
11324         unsigned int chk_length;
11325
11326         if (!stcb) {
11327                 return;
11328         }
11329         asoc = &stcb->asoc;
11330         SCTP_TCB_LOCK_ASSERT(stcb);
11331         if (asoc->peer_supports_pktdrop == 0) {
11332                 /*-
11333                  * peer must declare support before I send one.
11334                  */
11335                 return;
11336         }
11337         if (stcb->sctp_socket == NULL) {
11338                 return;
11339         }
11340         sctp_alloc_a_chunk(stcb, chk);
11341         if (chk == NULL) {
11342                 return;
11343         }
11344         chk->copy_by_ref = 0;
11345         iph = mtod(m, struct ip *);
11346         if (iph == NULL) {
11347                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11348                 return;
11349         }
11350         len -= iphlen;
11351         chk->send_size = len;
11352         /* Validate that we do not have an ABORT in here. */
11353         offset = iphlen + sizeof(struct sctphdr);
11354         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11355             sizeof(*ch), (uint8_t *) & chunk_buf);
11356         while (ch != NULL) {
11357                 chk_length = ntohs(ch->chunk_length);
11358                 if (chk_length < sizeof(*ch)) {
11359                         /* break to abort land */
11360                         break;
11361                 }
11362                 switch (ch->chunk_type) {
11363                 case SCTP_PACKET_DROPPED:
11364                 case SCTP_ABORT_ASSOCIATION:
11365                 case SCTP_INITIATION_ACK:
11366                         /**
11367                          * We don't respond with an PKT-DROP to an ABORT
11368                          * or PKT-DROP. We also do not respond to an
11369                          * INIT-ACK, because we can't know if the initiation
11370                          * tag is correct or not.
11371                          */
11372                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11373                         return;
11374                 default:
11375                         break;
11376                 }
11377                 offset += SCTP_SIZE32(chk_length);
11378                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11379                     sizeof(*ch), (uint8_t *) & chunk_buf);
11380         }
11381
11382         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11383             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11384                 /*
11385                  * only send 1 mtu worth, trim off the excess on the end.
11386                  */
11387                 fullsz = len;
11388                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11389                 was_trunc = 1;
11390         }
11391         chk->asoc = &stcb->asoc;
11392         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11393         if (chk->data == NULL) {
11394 jump_out:
11395                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11396                 return;
11397         }
11398         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11399         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11400         if (drp == NULL) {
11401                 sctp_m_freem(chk->data);
11402                 chk->data = NULL;
11403                 goto jump_out;
11404         }
11405         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11406             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11407         chk->book_size_scale = 0;
11408         if (was_trunc) {
11409                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11410                 drp->trunc_len = htons(fullsz);
11411                 /*
11412                  * Len is already adjusted to size minus overhead above take
11413                  * out the pkt_drop chunk itself from it.
11414                  */
11415                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11416                 len = chk->send_size;
11417         } else {
11418                 /* no truncation needed */
11419                 drp->ch.chunk_flags = 0;
11420                 drp->trunc_len = htons(0);
11421         }
11422         if (bad_crc) {
11423                 drp->ch.chunk_flags |= SCTP_BADCRC;
11424         }
11425         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11426         SCTP_BUF_LEN(chk->data) = chk->send_size;
11427         chk->sent = SCTP_DATAGRAM_UNSENT;
11428         chk->snd_count = 0;
11429         if (net) {
11430                 /* we should hit here */
11431                 chk->whoTo = net;
11432                 atomic_add_int(&chk->whoTo->ref_count, 1);
11433         } else {
11434                 chk->whoTo = NULL;
11435         }
11436         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11437         chk->rec.chunk_id.can_take_data = 1;
11438         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11439         drp->ch.chunk_length = htons(chk->send_size);
11440         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11441         if (spc < 0) {
11442                 spc = 0;
11443         }
11444         drp->bottle_bw = htonl(spc);
11445         if (asoc->my_rwnd) {
11446                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11447                     asoc->size_on_all_streams +
11448                     asoc->my_rwnd_control_len +
11449                     stcb->sctp_socket->so_rcv.sb_cc);
11450         } else {
11451                 /*-
11452                  * If my rwnd is 0, possibly from mbuf depletion as well as
11453                  * space used, tell the peer there is NO space aka onq == bw
11454                  */
11455                 drp->current_onq = htonl(spc);
11456         }
11457         drp->reserved = 0;
11458         datap = drp->data;
11459         m_copydata(m, iphlen, len, (caddr_t)datap);
11460         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11461         asoc->ctrl_queue_cnt++;
11462 }
11463
11464 void
11465 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11466 {
11467         struct sctp_association *asoc;
11468         struct sctp_cwr_chunk *cwr;
11469         struct sctp_tmit_chunk *chk;
11470
11471         asoc = &stcb->asoc;
11472         SCTP_TCB_LOCK_ASSERT(stcb);
11473         if (net == NULL) {
11474                 return;
11475         }
11476         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11477                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11478                         /*
11479                          * found a previous CWR queued to same destination
11480                          * update it if needed
11481                          */
11482                         uint32_t ctsn;
11483
11484                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11485                         ctsn = ntohl(cwr->tsn);
11486                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11487                                 cwr->tsn = htonl(high_tsn);
11488                         }
11489                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11490                                 /* Make sure override is carried */
11491                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11492                         }
11493                         return;
11494                 }
11495         }
11496         sctp_alloc_a_chunk(stcb, chk);
11497         if (chk == NULL) {
11498                 return;
11499         }
11500         chk->copy_by_ref = 0;
11501         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11502         chk->rec.chunk_id.can_take_data = 1;
11503         chk->asoc = &stcb->asoc;
11504         chk->send_size = sizeof(struct sctp_cwr_chunk);
11505         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11506         if (chk->data == NULL) {
11507                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11508                 return;
11509         }
11510         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11511         SCTP_BUF_LEN(chk->data) = chk->send_size;
11512         chk->sent = SCTP_DATAGRAM_UNSENT;
11513         chk->snd_count = 0;
11514         chk->whoTo = net;
11515         atomic_add_int(&chk->whoTo->ref_count, 1);
11516         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11517         cwr->ch.chunk_type = SCTP_ECN_CWR;
11518         cwr->ch.chunk_flags = override;
11519         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11520         cwr->tsn = htonl(high_tsn);
11521         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11522         asoc->ctrl_queue_cnt++;
11523 }
11524
11525 void
11526 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11527     int number_entries, uint16_t * list,
11528     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11529 {
11530         int len, old_len, i;
11531         struct sctp_stream_reset_out_request *req_out;
11532         struct sctp_chunkhdr *ch;
11533
11534         ch = mtod(chk->data, struct sctp_chunkhdr *);
11535
11536
11537         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11538
11539         /* get to new offset for the param. */
11540         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11541         /* now how long will this param be? */
11542         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11543         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11544         req_out->ph.param_length = htons(len);
11545         req_out->request_seq = htonl(seq);
11546         req_out->response_seq = htonl(resp_seq);
11547         req_out->send_reset_at_tsn = htonl(last_sent);
11548         if (number_entries) {
11549                 for (i = 0; i < number_entries; i++) {
11550                         req_out->list_of_streams[i] = htons(list[i]);
11551                 }
11552         }
11553         if (SCTP_SIZE32(len) > len) {
11554                 /*-
11555                  * Need to worry about the pad we may end up adding to the
11556                  * end. This is easy since the struct is either aligned to 4
11557                  * bytes or 2 bytes off.
11558                  */
11559                 req_out->list_of_streams[number_entries] = 0;
11560         }
11561         /* now fix the chunk length */
11562         ch->chunk_length = htons(len + old_len);
11563         chk->book_size = len + old_len;
11564         chk->book_size_scale = 0;
11565         chk->send_size = SCTP_SIZE32(chk->book_size);
11566         SCTP_BUF_LEN(chk->data) = chk->send_size;
11567         return;
11568 }
11569
11570
11571 void
11572 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11573     int number_entries, uint16_t * list,
11574     uint32_t seq)
11575 {
11576         int len, old_len, i;
11577         struct sctp_stream_reset_in_request *req_in;
11578         struct sctp_chunkhdr *ch;
11579
11580         ch = mtod(chk->data, struct sctp_chunkhdr *);
11581
11582
11583         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11584
11585         /* get to new offset for the param. */
11586         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11587         /* now how long will this param be? */
11588         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11589         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11590         req_in->ph.param_length = htons(len);
11591         req_in->request_seq = htonl(seq);
11592         if (number_entries) {
11593                 for (i = 0; i < number_entries; i++) {
11594                         req_in->list_of_streams[i] = htons(list[i]);
11595                 }
11596         }
11597         if (SCTP_SIZE32(len) > len) {
11598                 /*-
11599                  * Need to worry about the pad we may end up adding to the
11600                  * end. This is easy since the struct is either aligned to 4
11601                  * bytes or 2 bytes off.
11602                  */
11603                 req_in->list_of_streams[number_entries] = 0;
11604         }
11605         /* now fix the chunk length */
11606         ch->chunk_length = htons(len + old_len);
11607         chk->book_size = len + old_len;
11608         chk->book_size_scale = 0;
11609         chk->send_size = SCTP_SIZE32(chk->book_size);
11610         SCTP_BUF_LEN(chk->data) = chk->send_size;
11611         return;
11612 }
11613
11614
11615 void
11616 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11617     uint32_t seq)
11618 {
11619         int len, old_len;
11620         struct sctp_stream_reset_tsn_request *req_tsn;
11621         struct sctp_chunkhdr *ch;
11622
11623         ch = mtod(chk->data, struct sctp_chunkhdr *);
11624
11625
11626         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11627
11628         /* get to new offset for the param. */
11629         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11630         /* now how long will this param be? */
11631         len = sizeof(struct sctp_stream_reset_tsn_request);
11632         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11633         req_tsn->ph.param_length = htons(len);
11634         req_tsn->request_seq = htonl(seq);
11635
11636         /* now fix the chunk length */
11637         ch->chunk_length = htons(len + old_len);
11638         chk->send_size = len + old_len;
11639         chk->book_size = SCTP_SIZE32(chk->send_size);
11640         chk->book_size_scale = 0;
11641         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11642         return;
11643 }
11644
11645 void
11646 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11647     uint32_t resp_seq, uint32_t result)
11648 {
11649         int len, old_len;
11650         struct sctp_stream_reset_response *resp;
11651         struct sctp_chunkhdr *ch;
11652
11653         ch = mtod(chk->data, struct sctp_chunkhdr *);
11654
11655
11656         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11657
11658         /* get to new offset for the param. */
11659         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11660         /* now how long will this param be? */
11661         len = sizeof(struct sctp_stream_reset_response);
11662         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11663         resp->ph.param_length = htons(len);
11664         resp->response_seq = htonl(resp_seq);
11665         resp->result = ntohl(result);
11666
11667         /* now fix the chunk length */
11668         ch->chunk_length = htons(len + old_len);
11669         chk->book_size = len + old_len;
11670         chk->book_size_scale = 0;
11671         chk->send_size = SCTP_SIZE32(chk->book_size);
11672         SCTP_BUF_LEN(chk->data) = chk->send_size;
11673         return;
11674
11675 }
11676
11677
11678 void
11679 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11680     uint32_t resp_seq, uint32_t result,
11681     uint32_t send_una, uint32_t recv_next)
11682 {
11683         int len, old_len;
11684         struct sctp_stream_reset_response_tsn *resp;
11685         struct sctp_chunkhdr *ch;
11686
11687         ch = mtod(chk->data, struct sctp_chunkhdr *);
11688
11689
11690         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11691
11692         /* get to new offset for the param. */
11693         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11694         /* now how long will this param be? */
11695         len = sizeof(struct sctp_stream_reset_response_tsn);
11696         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11697         resp->ph.param_length = htons(len);
11698         resp->response_seq = htonl(resp_seq);
11699         resp->result = htonl(result);
11700         resp->senders_next_tsn = htonl(send_una);
11701         resp->receivers_next_tsn = htonl(recv_next);
11702
11703         /* now fix the chunk length */
11704         ch->chunk_length = htons(len + old_len);
11705         chk->book_size = len + old_len;
11706         chk->send_size = SCTP_SIZE32(chk->book_size);
11707         chk->book_size_scale = 0;
11708         SCTP_BUF_LEN(chk->data) = chk->send_size;
11709         return;
11710 }
11711
11712 static void
11713 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11714     uint32_t seq,
11715     uint16_t adding)
11716 {
11717         int len, old_len;
11718         struct sctp_chunkhdr *ch;
11719         struct sctp_stream_reset_add_strm *addstr;
11720
11721         ch = mtod(chk->data, struct sctp_chunkhdr *);
11722         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11723
11724         /* get to new offset for the param. */
11725         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11726         /* now how long will this param be? */
11727         len = sizeof(struct sctp_stream_reset_add_strm);
11728
11729         /* Fill it out. */
11730         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11731         addstr->ph.param_length = htons(len);
11732         addstr->request_seq = htonl(seq);
11733         addstr->number_of_streams = htons(adding);
11734         addstr->reserved = 0;
11735
11736         /* now fix the chunk length */
11737         ch->chunk_length = htons(len + old_len);
11738         chk->send_size = len + old_len;
11739         chk->book_size = SCTP_SIZE32(chk->send_size);
11740         chk->book_size_scale = 0;
11741         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11742         return;
11743 }
11744
11745 static void
11746 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11747     uint32_t seq,
11748     uint16_t adding)
11749 {
11750         int len, old_len;
11751         struct sctp_chunkhdr *ch;
11752         struct sctp_stream_reset_add_strm *addstr;
11753
11754         ch = mtod(chk->data, struct sctp_chunkhdr *);
11755         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11756
11757         /* get to new offset for the param. */
11758         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11759         /* now how long will this param be? */
11760         len = sizeof(struct sctp_stream_reset_add_strm);
11761         /* Fill it out. */
11762         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11763         addstr->ph.param_length = htons(len);
11764         addstr->request_seq = htonl(seq);
11765         addstr->number_of_streams = htons(adding);
11766         addstr->reserved = 0;
11767
11768         /* now fix the chunk length */
11769         ch->chunk_length = htons(len + old_len);
11770         chk->send_size = len + old_len;
11771         chk->book_size = SCTP_SIZE32(chk->send_size);
11772         chk->book_size_scale = 0;
11773         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11774         return;
11775 }
11776
11777
11778
11779 int
11780 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11781     int number_entries, uint16_t * list,
11782     uint8_t send_out_req,
11783     uint8_t send_in_req,
11784     uint8_t send_tsn_req,
11785     uint8_t add_stream,
11786     uint16_t adding_o,
11787     uint16_t adding_i, uint8_t peer_asked
11788 )
11789 {
11790
11791         struct sctp_association *asoc;
11792         struct sctp_tmit_chunk *chk;
11793         struct sctp_chunkhdr *ch;
11794         uint32_t seq;
11795
11796         asoc = &stcb->asoc;
11797         if (asoc->stream_reset_outstanding) {
11798                 /*-
11799                  * Already one pending, must get ACK back to clear the flag.
11800                  */
11801                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11802                 return (EBUSY);
11803         }
11804         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11805             (add_stream == 0)) {
11806                 /* nothing to do */
11807                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11808                 return (EINVAL);
11809         }
11810         if (send_tsn_req && (send_out_req || send_in_req)) {
11811                 /* error, can't do that */
11812                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11813                 return (EINVAL);
11814         }
11815         sctp_alloc_a_chunk(stcb, chk);
11816         if (chk == NULL) {
11817                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11818                 return (ENOMEM);
11819         }
11820         chk->copy_by_ref = 0;
11821         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11822         chk->rec.chunk_id.can_take_data = 0;
11823         chk->asoc = &stcb->asoc;
11824         chk->book_size = sizeof(struct sctp_chunkhdr);
11825         chk->send_size = SCTP_SIZE32(chk->book_size);
11826         chk->book_size_scale = 0;
11827
11828         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11829         if (chk->data == NULL) {
11830                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11831                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11832                 return (ENOMEM);
11833         }
11834         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11835
11836         /* setup chunk parameters */
11837         chk->sent = SCTP_DATAGRAM_UNSENT;
11838         chk->snd_count = 0;
11839         if (stcb->asoc.alternate) {
11840                 chk->whoTo = stcb->asoc.alternate;
11841         } else {
11842                 chk->whoTo = stcb->asoc.primary_destination;
11843         }
11844         atomic_add_int(&chk->whoTo->ref_count, 1);
11845         ch = mtod(chk->data, struct sctp_chunkhdr *);
11846         ch->chunk_type = SCTP_STREAM_RESET;
11847         ch->chunk_flags = 0;
11848         ch->chunk_length = htons(chk->book_size);
11849         SCTP_BUF_LEN(chk->data) = chk->send_size;
11850
11851         seq = stcb->asoc.str_reset_seq_out;
11852         if (send_out_req) {
11853                 sctp_add_stream_reset_out(chk, number_entries, list,
11854                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11855                 asoc->stream_reset_out_is_outstanding = 1;
11856                 seq++;
11857                 asoc->stream_reset_outstanding++;
11858         }
11859         if ((add_stream & 1) &&
11860             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11861                 /* Need to allocate more */
11862                 struct sctp_stream_out *oldstream;
11863                 struct sctp_stream_queue_pending *sp, *nsp;
11864                 int i;
11865
11866                 oldstream = stcb->asoc.strmout;
11867                 /* get some more */
11868                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11869                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11870                     SCTP_M_STRMO);
11871                 if (stcb->asoc.strmout == NULL) {
11872                         uint8_t x;
11873
11874                         stcb->asoc.strmout = oldstream;
11875                         /* Turn off the bit */
11876                         x = add_stream & 0xfe;
11877                         add_stream = x;
11878                         goto skip_stuff;
11879                 }
11880                 /*
11881                  * Ok now we proceed with copying the old out stuff and
11882                  * initializing the new stuff.
11883                  */
11884                 SCTP_TCB_SEND_LOCK(stcb);
11885                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11886                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11887                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11888                         stcb->asoc.strmout[i].next_sequence_sent = oldstream[i].next_sequence_sent;
11889                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11890                         stcb->asoc.strmout[i].stream_no = i;
11891                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11892                         /* now anything on those queues? */
11893                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11894                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11895                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11896                         }
11897                         /* Now move assoc pointers too */
11898                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11899                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11900                         }
11901                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11902                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11903                         }
11904                 }
11905                 /* now the new streams */
11906                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11907                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11908                         stcb->asoc.strmout[i].next_sequence_sent = 0x0;
11909                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11910                         stcb->asoc.strmout[i].stream_no = i;
11911                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11912                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11913                 }
11914                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11915                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11916                 SCTP_TCB_SEND_UNLOCK(stcb);
11917         }
11918 skip_stuff:
11919         if ((add_stream & 1) && (adding_o > 0)) {
11920                 asoc->strm_pending_add_size = adding_o;
11921                 asoc->peer_req_out = peer_asked;
11922                 sctp_add_an_out_stream(chk, seq, adding_o);
11923                 seq++;
11924                 asoc->stream_reset_outstanding++;
11925         }
11926         if ((add_stream & 2) && (adding_i > 0)) {
11927                 sctp_add_an_in_stream(chk, seq, adding_i);
11928                 seq++;
11929                 asoc->stream_reset_outstanding++;
11930         }
11931         if (send_in_req) {
11932                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11933                 seq++;
11934                 asoc->stream_reset_outstanding++;
11935         }
11936         if (send_tsn_req) {
11937                 sctp_add_stream_reset_tsn(chk, seq);
11938                 asoc->stream_reset_outstanding++;
11939         }
11940         asoc->str_reset = chk;
11941         /* insert the chunk for sending */
11942         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11943             chk,
11944             sctp_next);
11945         asoc->ctrl_queue_cnt++;
11946         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11947         return (0);
11948 }
11949
11950 void
11951 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11952     struct mbuf *cause,
11953     uint8_t use_mflowid, uint32_t mflowid,
11954     uint32_t vrf_id, uint16_t port)
11955 {
11956         /* Don't respond to an ABORT with an ABORT. */
11957         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11958                 if (cause)
11959                         sctp_m_freem(cause);
11960                 return;
11961         }
11962         sctp_send_resp_msg(m, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
11963             use_mflowid, mflowid,
11964             vrf_id, port);
11965         return;
11966 }
11967
11968 void
11969 sctp_send_operr_to(struct mbuf *m, struct sctphdr *sh, uint32_t vtag,
11970     struct mbuf *cause,
11971     uint8_t use_mflowid, uint32_t mflowid,
11972     uint32_t vrf_id, uint16_t port)
11973 {
11974         sctp_send_resp_msg(m, sh, vtag, SCTP_OPERATION_ERROR, cause,
11975             use_mflowid, mflowid,
11976             vrf_id, port);
11977         return;
11978 }
11979
11980 static struct mbuf *
11981 sctp_copy_resume(struct uio *uio,
11982     int max_send_len,
11983     int user_marks_eor,
11984     int *error,
11985     uint32_t * sndout,
11986     struct mbuf **new_tail)
11987 {
11988         struct mbuf *m;
11989
11990         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
11991             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
11992         if (m == NULL) {
11993                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11994                 *error = ENOMEM;
11995         } else {
11996                 *sndout = m_length(m, NULL);
11997                 *new_tail = m_last(m);
11998         }
11999         return (m);
12000 }
12001
12002 static int
12003 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12004     struct uio *uio,
12005     int resv_upfront)
12006 {
12007         int left;
12008
12009         left = sp->length;
12010         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12011             resv_upfront, 0);
12012         if (sp->data == NULL) {
12013                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12014                 return (ENOMEM);
12015         }
12016         sp->tail_mbuf = m_last(sp->data);
12017         return (0);
12018 }
12019
12020
12021
12022 static struct sctp_stream_queue_pending *
12023 sctp_copy_it_in(struct sctp_tcb *stcb,
12024     struct sctp_association *asoc,
12025     struct sctp_sndrcvinfo *srcv,
12026     struct uio *uio,
12027     struct sctp_nets *net,
12028     int max_send_len,
12029     int user_marks_eor,
12030     int *error)
12031 {
12032         /*-
12033          * This routine must be very careful in its work. Protocol
12034          * processing is up and running so care must be taken to spl...()
12035          * when you need to do something that may effect the stcb/asoc. The
12036          * sb is locked however. When data is copied the protocol processing
12037          * should be enabled since this is a slower operation...
12038          */
12039         struct sctp_stream_queue_pending *sp = NULL;
12040         int resv_in_first;
12041
12042         *error = 0;
12043         /* Now can we send this? */
12044         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12045             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12046             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12047             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12048                 /* got data while shutting down */
12049                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12050                 *error = ECONNRESET;
12051                 goto out_now;
12052         }
12053         sctp_alloc_a_strmoq(stcb, sp);
12054         if (sp == NULL) {
12055                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12056                 *error = ENOMEM;
12057                 goto out_now;
12058         }
12059         sp->act_flags = 0;
12060         sp->sender_all_done = 0;
12061         sp->sinfo_flags = srcv->sinfo_flags;
12062         sp->timetolive = srcv->sinfo_timetolive;
12063         sp->ppid = srcv->sinfo_ppid;
12064         sp->context = srcv->sinfo_context;
12065         sp->strseq = 0;
12066         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12067
12068         sp->stream = srcv->sinfo_stream;
12069         sp->length = min(uio->uio_resid, max_send_len);
12070         if ((sp->length == (uint32_t) uio->uio_resid) &&
12071             ((user_marks_eor == 0) ||
12072             (srcv->sinfo_flags & SCTP_EOF) ||
12073             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12074                 sp->msg_is_complete = 1;
12075         } else {
12076                 sp->msg_is_complete = 0;
12077         }
12078         sp->sender_all_done = 0;
12079         sp->some_taken = 0;
12080         sp->put_last_out = 0;
12081         resv_in_first = sizeof(struct sctp_data_chunk);
12082         sp->data = sp->tail_mbuf = NULL;
12083         if (sp->length == 0) {
12084                 *error = 0;
12085                 goto skip_copy;
12086         }
12087         if (srcv->sinfo_keynumber_valid) {
12088                 sp->auth_keyid = srcv->sinfo_keynumber;
12089         } else {
12090                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12091         }
12092         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12093                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12094                 sp->holds_key_ref = 1;
12095         }
12096         *error = sctp_copy_one(sp, uio, resv_in_first);
12097 skip_copy:
12098         if (*error) {
12099                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12100                 sp = NULL;
12101         } else {
12102                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12103                         sp->net = net;
12104                         atomic_add_int(&sp->net->ref_count, 1);
12105                 } else {
12106                         sp->net = NULL;
12107                 }
12108                 sctp_set_prsctp_policy(sp);
12109         }
12110 out_now:
12111         return (sp);
12112 }
12113
12114
12115 int
12116 sctp_sosend(struct socket *so,
12117     struct sockaddr *addr,
12118     struct uio *uio,
12119     struct mbuf *top,
12120     struct mbuf *control,
12121     int flags,
12122     struct thread *p
12123 )
12124 {
12125         int error, use_sndinfo = 0;
12126         struct sctp_sndrcvinfo sndrcvninfo;
12127         struct sockaddr *addr_to_use;
12128
12129 #if defined(INET) && defined(INET6)
12130         struct sockaddr_in sin;
12131
12132 #endif
12133
12134         if (control) {
12135                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12136                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12137                     sizeof(sndrcvninfo))) {
12138                         /* got one */
12139                         use_sndinfo = 1;
12140                 }
12141         }
12142         addr_to_use = addr;
12143 #if defined(INET) && defined(INET6)
12144         if ((addr) && (addr->sa_family == AF_INET6)) {
12145                 struct sockaddr_in6 *sin6;
12146
12147                 sin6 = (struct sockaddr_in6 *)addr;
12148                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12149                         in6_sin6_2_sin(&sin, sin6);
12150                         addr_to_use = (struct sockaddr *)&sin;
12151                 }
12152         }
12153 #endif
12154         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12155             control,
12156             flags,
12157             use_sndinfo ? &sndrcvninfo : NULL
12158             ,p
12159             );
12160         return (error);
12161 }
12162
12163
12164 int
12165 sctp_lower_sosend(struct socket *so,
12166     struct sockaddr *addr,
12167     struct uio *uio,
12168     struct mbuf *i_pak,
12169     struct mbuf *control,
12170     int flags,
12171     struct sctp_sndrcvinfo *srcv
12172     ,
12173     struct thread *p
12174 )
12175 {
12176         unsigned int sndlen = 0, max_len;
12177         int error, len;
12178         struct mbuf *top = NULL;
12179         int queue_only = 0, queue_only_for_init = 0;
12180         int free_cnt_applied = 0;
12181         int un_sent;
12182         int now_filled = 0;
12183         unsigned int inqueue_bytes = 0;
12184         struct sctp_block_entry be;
12185         struct sctp_inpcb *inp;
12186         struct sctp_tcb *stcb = NULL;
12187         struct timeval now;
12188         struct sctp_nets *net;
12189         struct sctp_association *asoc;
12190         struct sctp_inpcb *t_inp;
12191         int user_marks_eor;
12192         int create_lock_applied = 0;
12193         int nagle_applies = 0;
12194         int some_on_control = 0;
12195         int got_all_of_the_send = 0;
12196         int hold_tcblock = 0;
12197         int non_blocking = 0;
12198         uint32_t local_add_more, local_soresv = 0;
12199         uint16_t port;
12200         uint16_t sinfo_flags;
12201         sctp_assoc_t sinfo_assoc_id;
12202
12203         error = 0;
12204         net = NULL;
12205         stcb = NULL;
12206         asoc = NULL;
12207
12208         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12209         if (inp == NULL) {
12210                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12211                 error = EINVAL;
12212                 if (i_pak) {
12213                         SCTP_RELEASE_PKT(i_pak);
12214                 }
12215                 return (error);
12216         }
12217         if ((uio == NULL) && (i_pak == NULL)) {
12218                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12219                 return (EINVAL);
12220         }
12221         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12222         atomic_add_int(&inp->total_sends, 1);
12223         if (uio) {
12224                 if (uio->uio_resid < 0) {
12225                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12226                         return (EINVAL);
12227                 }
12228                 sndlen = uio->uio_resid;
12229         } else {
12230                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12231                 sndlen = SCTP_HEADER_LEN(i_pak);
12232         }
12233         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12234             addr,
12235             sndlen);
12236         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12237             (inp->sctp_socket->so_qlimit)) {
12238                 /* The listener can NOT send */
12239                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12240                 error = ENOTCONN;
12241                 goto out_unlocked;
12242         }
12243         /**
12244          * Pre-screen address, if one is given the sin-len
12245          * must be set correctly!
12246          */
12247         if (addr) {
12248                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12249
12250                 switch (raddr->sa.sa_family) {
12251 #ifdef INET
12252                 case AF_INET:
12253                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12254                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12255                                 error = EINVAL;
12256                                 goto out_unlocked;
12257                         }
12258                         port = raddr->sin.sin_port;
12259                         break;
12260 #endif
12261 #ifdef INET6
12262                 case AF_INET6:
12263                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12264                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12265                                 error = EINVAL;
12266                                 goto out_unlocked;
12267                         }
12268                         port = raddr->sin6.sin6_port;
12269                         break;
12270 #endif
12271                 default:
12272                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12273                         error = EAFNOSUPPORT;
12274                         goto out_unlocked;
12275                 }
12276         } else
12277                 port = 0;
12278
12279         if (srcv) {
12280                 sinfo_flags = srcv->sinfo_flags;
12281                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12282                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12283                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12284                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12285                         error = EINVAL;
12286                         goto out_unlocked;
12287                 }
12288                 if (srcv->sinfo_flags)
12289                         SCTP_STAT_INCR(sctps_sends_with_flags);
12290         } else {
12291                 sinfo_flags = inp->def_send.sinfo_flags;
12292                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12293         }
12294         if (sinfo_flags & SCTP_SENDALL) {
12295                 /* its a sendall */
12296                 error = sctp_sendall(inp, uio, top, srcv);
12297                 top = NULL;
12298                 goto out_unlocked;
12299         }
12300         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12301                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12302                 error = EINVAL;
12303                 goto out_unlocked;
12304         }
12305         /* now we must find the assoc */
12306         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12307             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12308                 SCTP_INP_RLOCK(inp);
12309                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12310                 if (stcb) {
12311                         SCTP_TCB_LOCK(stcb);
12312                         hold_tcblock = 1;
12313                 }
12314                 SCTP_INP_RUNLOCK(inp);
12315         } else if (sinfo_assoc_id) {
12316                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12317         } else if (addr) {
12318                 /*-
12319                  * Since we did not use findep we must
12320                  * increment it, and if we don't find a tcb
12321                  * decrement it.
12322                  */
12323                 SCTP_INP_WLOCK(inp);
12324                 SCTP_INP_INCR_REF(inp);
12325                 SCTP_INP_WUNLOCK(inp);
12326                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12327                 if (stcb == NULL) {
12328                         SCTP_INP_WLOCK(inp);
12329                         SCTP_INP_DECR_REF(inp);
12330                         SCTP_INP_WUNLOCK(inp);
12331                 } else {
12332                         hold_tcblock = 1;
12333                 }
12334         }
12335         if ((stcb == NULL) && (addr)) {
12336                 /* Possible implicit send? */
12337                 SCTP_ASOC_CREATE_LOCK(inp);
12338                 create_lock_applied = 1;
12339                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12340                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12341                         /* Should I really unlock ? */
12342                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12343                         error = EINVAL;
12344                         goto out_unlocked;
12345
12346                 }
12347                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12348                     (addr->sa_family == AF_INET6)) {
12349                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12350                         error = EINVAL;
12351                         goto out_unlocked;
12352                 }
12353                 SCTP_INP_WLOCK(inp);
12354                 SCTP_INP_INCR_REF(inp);
12355                 SCTP_INP_WUNLOCK(inp);
12356                 /* With the lock applied look again */
12357                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12358                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12359                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12360                 }
12361                 if (stcb == NULL) {
12362                         SCTP_INP_WLOCK(inp);
12363                         SCTP_INP_DECR_REF(inp);
12364                         SCTP_INP_WUNLOCK(inp);
12365                 } else {
12366                         hold_tcblock = 1;
12367                 }
12368                 if (error) {
12369                         goto out_unlocked;
12370                 }
12371                 if (t_inp != inp) {
12372                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12373                         error = ENOTCONN;
12374                         goto out_unlocked;
12375                 }
12376         }
12377         if (stcb == NULL) {
12378                 if (addr == NULL) {
12379                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12380                         error = ENOENT;
12381                         goto out_unlocked;
12382                 } else {
12383                         /* We must go ahead and start the INIT process */
12384                         uint32_t vrf_id;
12385
12386                         if ((sinfo_flags & SCTP_ABORT) ||
12387                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12388                                 /*-
12389                                  * User asks to abort a non-existant assoc,
12390                                  * or EOF a non-existant assoc with no data
12391                                  */
12392                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12393                                 error = ENOENT;
12394                                 goto out_unlocked;
12395                         }
12396                         /* get an asoc/stcb struct */
12397                         vrf_id = inp->def_vrf_id;
12398 #ifdef INVARIANTS
12399                         if (create_lock_applied == 0) {
12400                                 panic("Error, should hold create lock and I don't?");
12401                         }
12402 #endif
12403                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12404                             p
12405                             );
12406                         if (stcb == NULL) {
12407                                 /* Error is setup for us in the call */
12408                                 goto out_unlocked;
12409                         }
12410                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12411                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12412                                 /*
12413                                  * Set the connected flag so we can queue
12414                                  * data
12415                                  */
12416                                 soisconnecting(so);
12417                         }
12418                         hold_tcblock = 1;
12419                         if (create_lock_applied) {
12420                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12421                                 create_lock_applied = 0;
12422                         } else {
12423                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12424                         }
12425                         /*
12426                          * Turn on queue only flag to prevent data from
12427                          * being sent
12428                          */
12429                         queue_only = 1;
12430                         asoc = &stcb->asoc;
12431                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12432                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12433
12434                         /* initialize authentication params for the assoc */
12435                         sctp_initialize_auth_params(inp, stcb);
12436
12437                         if (control) {
12438                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12439                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12440                                         hold_tcblock = 0;
12441                                         stcb = NULL;
12442                                         goto out_unlocked;
12443                                 }
12444                         }
12445                         /* out with the INIT */
12446                         queue_only_for_init = 1;
12447                         /*-
12448                          * we may want to dig in after this call and adjust the MTU
12449                          * value. It defaulted to 1500 (constant) but the ro
12450                          * structure may now have an update and thus we may need to
12451                          * change it BEFORE we append the message.
12452                          */
12453                 }
12454         } else
12455                 asoc = &stcb->asoc;
12456         if (srcv == NULL)
12457                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12458         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12459                 if (addr)
12460                         net = sctp_findnet(stcb, addr);
12461                 else
12462                         net = NULL;
12463                 if ((net == NULL) ||
12464                     ((port != 0) && (port != stcb->rport))) {
12465                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12466                         error = EINVAL;
12467                         goto out_unlocked;
12468                 }
12469         } else {
12470                 if (stcb->asoc.alternate) {
12471                         net = stcb->asoc.alternate;
12472                 } else {
12473                         net = stcb->asoc.primary_destination;
12474                 }
12475         }
12476         atomic_add_int(&stcb->total_sends, 1);
12477         /* Keep the stcb from being freed under our feet */
12478         atomic_add_int(&asoc->refcnt, 1);
12479         free_cnt_applied = 1;
12480
12481         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12482                 if (sndlen > asoc->smallest_mtu) {
12483                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12484                         error = EMSGSIZE;
12485                         goto out_unlocked;
12486                 }
12487         }
12488         if (SCTP_SO_IS_NBIO(so)
12489             || (flags & MSG_NBIO)
12490             ) {
12491                 non_blocking = 1;
12492         }
12493         /* would we block? */
12494         if (non_blocking) {
12495                 if (hold_tcblock == 0) {
12496                         SCTP_TCB_LOCK(stcb);
12497                         hold_tcblock = 1;
12498                 }
12499                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12500                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12501                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12502                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12503                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12504                                 error = EMSGSIZE;
12505                         else
12506                                 error = EWOULDBLOCK;
12507                         goto out_unlocked;
12508                 }
12509                 stcb->asoc.sb_send_resv += sndlen;
12510                 SCTP_TCB_UNLOCK(stcb);
12511                 hold_tcblock = 0;
12512         } else {
12513                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12514         }
12515         local_soresv = sndlen;
12516         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12517                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12518                 error = ECONNRESET;
12519                 goto out_unlocked;
12520         }
12521         if (create_lock_applied) {
12522                 SCTP_ASOC_CREATE_UNLOCK(inp);
12523                 create_lock_applied = 0;
12524         }
12525         if (asoc->stream_reset_outstanding) {
12526                 /*
12527                  * Can't queue any data while stream reset is underway.
12528                  */
12529                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12530                 error = EAGAIN;
12531                 goto out_unlocked;
12532         }
12533         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12534             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12535                 queue_only = 1;
12536         }
12537         /* we are now done with all control */
12538         if (control) {
12539                 sctp_m_freem(control);
12540                 control = NULL;
12541         }
12542         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12543             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12544             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12545             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12546                 if (srcv->sinfo_flags & SCTP_ABORT) {
12547                         ;
12548                 } else {
12549                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12550                         error = ECONNRESET;
12551                         goto out_unlocked;
12552                 }
12553         }
12554         /* Ok, we will attempt a msgsnd :> */
12555         if (p) {
12556                 p->td_ru.ru_msgsnd++;
12557         }
12558         /* Are we aborting? */
12559         if (srcv->sinfo_flags & SCTP_ABORT) {
12560                 struct mbuf *mm;
12561                 int tot_demand, tot_out = 0, max_out;
12562
12563                 SCTP_STAT_INCR(sctps_sends_with_abort);
12564                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12565                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12566                         /* It has to be up before we abort */
12567                         /* how big is the user initiated abort? */
12568                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12569                         error = EINVAL;
12570                         goto out;
12571                 }
12572                 if (hold_tcblock) {
12573                         SCTP_TCB_UNLOCK(stcb);
12574                         hold_tcblock = 0;
12575                 }
12576                 if (top) {
12577                         struct mbuf *cntm = NULL;
12578
12579                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12580                         if (sndlen != 0) {
12581                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12582                                         tot_out += SCTP_BUF_LEN(cntm);
12583                                 }
12584                         }
12585                 } else {
12586                         /* Must fit in a MTU */
12587                         tot_out = sndlen;
12588                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12589                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12590                                 /* To big */
12591                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12592                                 error = EMSGSIZE;
12593                                 goto out;
12594                         }
12595                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12596                 }
12597                 if (mm == NULL) {
12598                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12599                         error = ENOMEM;
12600                         goto out;
12601                 }
12602                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12603                 max_out -= sizeof(struct sctp_abort_msg);
12604                 if (tot_out > max_out) {
12605                         tot_out = max_out;
12606                 }
12607                 if (mm) {
12608                         struct sctp_paramhdr *ph;
12609
12610                         /* now move forward the data pointer */
12611                         ph = mtod(mm, struct sctp_paramhdr *);
12612                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12613                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12614                         ph++;
12615                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12616                         if (top == NULL) {
12617                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12618                                 if (error) {
12619                                         /*-
12620                                          * Here if we can't get his data we
12621                                          * still abort we just don't get to
12622                                          * send the users note :-0
12623                                          */
12624                                         sctp_m_freem(mm);
12625                                         mm = NULL;
12626                                 }
12627                         } else {
12628                                 if (sndlen != 0) {
12629                                         SCTP_BUF_NEXT(mm) = top;
12630                                 }
12631                         }
12632                 }
12633                 if (hold_tcblock == 0) {
12634                         SCTP_TCB_LOCK(stcb);
12635                 }
12636                 atomic_add_int(&stcb->asoc.refcnt, -1);
12637                 free_cnt_applied = 0;
12638                 /* release this lock, otherwise we hang on ourselves */
12639                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12640                 /* now relock the stcb so everything is sane */
12641                 hold_tcblock = 0;
12642                 stcb = NULL;
12643                 /*
12644                  * In this case top is already chained to mm avoid double
12645                  * free, since we free it below if top != NULL and driver
12646                  * would free it after sending the packet out
12647                  */
12648                 if (sndlen != 0) {
12649                         top = NULL;
12650                 }
12651                 goto out_unlocked;
12652         }
12653         /* Calculate the maximum we can send */
12654         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12655         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12656                 if (non_blocking) {
12657                         /* we already checked for non-blocking above. */
12658                         max_len = sndlen;
12659                 } else {
12660                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12661                 }
12662         } else {
12663                 max_len = 0;
12664         }
12665         if (hold_tcblock) {
12666                 SCTP_TCB_UNLOCK(stcb);
12667                 hold_tcblock = 0;
12668         }
12669         /* Is the stream no. valid? */
12670         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12671                 /* Invalid stream number */
12672                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12673                 error = EINVAL;
12674                 goto out_unlocked;
12675         }
12676         if (asoc->strmout == NULL) {
12677                 /* huh? software error */
12678                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12679                 error = EFAULT;
12680                 goto out_unlocked;
12681         }
12682         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12683         if ((user_marks_eor == 0) &&
12684             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12685                 /* It will NEVER fit */
12686                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12687                 error = EMSGSIZE;
12688                 goto out_unlocked;
12689         }
12690         if ((uio == NULL) && user_marks_eor) {
12691                 /*-
12692                  * We do not support eeor mode for
12693                  * sending with mbuf chains (like sendfile).
12694                  */
12695                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12696                 error = EINVAL;
12697                 goto out_unlocked;
12698         }
12699         if (user_marks_eor) {
12700                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12701         } else {
12702                 /*-
12703                  * For non-eeor the whole message must fit in
12704                  * the socket send buffer.
12705                  */
12706                 local_add_more = sndlen;
12707         }
12708         len = 0;
12709         if (non_blocking) {
12710                 goto skip_preblock;
12711         }
12712         if (((max_len <= local_add_more) &&
12713             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12714             (max_len == 0) ||
12715             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12716                 /* No room right now ! */
12717                 SOCKBUF_LOCK(&so->so_snd);
12718                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12719                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12720                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12721                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12722                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12723                             inqueue_bytes,
12724                             local_add_more,
12725                             stcb->asoc.stream_queue_cnt,
12726                             stcb->asoc.chunks_on_out_queue,
12727                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12728                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12729                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12730                         }
12731                         be.error = 0;
12732                         stcb->block_entry = &be;
12733                         error = sbwait(&so->so_snd);
12734                         stcb->block_entry = NULL;
12735                         if (error || so->so_error || be.error) {
12736                                 if (error == 0) {
12737                                         if (so->so_error)
12738                                                 error = so->so_error;
12739                                         if (be.error) {
12740                                                 error = be.error;
12741                                         }
12742                                 }
12743                                 SOCKBUF_UNLOCK(&so->so_snd);
12744                                 goto out_unlocked;
12745                         }
12746                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12747                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12748                                     asoc, stcb->asoc.total_output_queue_size);
12749                         }
12750                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12751                                 goto out_unlocked;
12752                         }
12753                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12754                 }
12755                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12756                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12757                 } else {
12758                         max_len = 0;
12759                 }
12760                 SOCKBUF_UNLOCK(&so->so_snd);
12761         }
12762 skip_preblock:
12763         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12764                 goto out_unlocked;
12765         }
12766         /*
12767          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12768          * case NOTE: uio will be null when top/mbuf is passed
12769          */
12770         if (sndlen == 0) {
12771                 if (srcv->sinfo_flags & SCTP_EOF) {
12772                         got_all_of_the_send = 1;
12773                         goto dataless_eof;
12774                 } else {
12775                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12776                         error = EINVAL;
12777                         goto out;
12778                 }
12779         }
12780         if (top == NULL) {
12781                 struct sctp_stream_queue_pending *sp;
12782                 struct sctp_stream_out *strm;
12783                 uint32_t sndout;
12784
12785                 SCTP_TCB_SEND_LOCK(stcb);
12786                 if ((asoc->stream_locked) &&
12787                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12788                         SCTP_TCB_SEND_UNLOCK(stcb);
12789                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12790                         error = EINVAL;
12791                         goto out;
12792                 }
12793                 SCTP_TCB_SEND_UNLOCK(stcb);
12794
12795                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12796                 if (strm->last_msg_incomplete == 0) {
12797         do_a_copy_in:
12798                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12799                         if ((sp == NULL) || (error)) {
12800                                 goto out;
12801                         }
12802                         SCTP_TCB_SEND_LOCK(stcb);
12803                         if (sp->msg_is_complete) {
12804                                 strm->last_msg_incomplete = 0;
12805                                 asoc->stream_locked = 0;
12806                         } else {
12807                                 /*
12808                                  * Just got locked to this guy in case of an
12809                                  * interrupt.
12810                                  */
12811                                 strm->last_msg_incomplete = 1;
12812                                 asoc->stream_locked = 1;
12813                                 asoc->stream_locked_on = srcv->sinfo_stream;
12814                                 sp->sender_all_done = 0;
12815                         }
12816                         sctp_snd_sb_alloc(stcb, sp->length);
12817                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12818                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12819                                 sp->strseq = strm->next_sequence_sent;
12820                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12821                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12822                                             (uintptr_t) stcb, sp->length,
12823                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12824                                 }
12825                                 strm->next_sequence_sent++;
12826                         } else {
12827                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12828                         }
12829                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12830                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12831                         SCTP_TCB_SEND_UNLOCK(stcb);
12832                 } else {
12833                         SCTP_TCB_SEND_LOCK(stcb);
12834                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12835                         SCTP_TCB_SEND_UNLOCK(stcb);
12836                         if (sp == NULL) {
12837                                 /* ???? Huh ??? last msg is gone */
12838 #ifdef INVARIANTS
12839                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12840 #else
12841                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12842                                 strm->last_msg_incomplete = 0;
12843 #endif
12844                                 goto do_a_copy_in;
12845
12846                         }
12847                 }
12848                 while (uio->uio_resid > 0) {
12849                         /* How much room do we have? */
12850                         struct mbuf *new_tail, *mm;
12851
12852                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12853                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12854                         else
12855                                 max_len = 0;
12856
12857                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12858                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12859                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12860                                 sndout = 0;
12861                                 new_tail = NULL;
12862                                 if (hold_tcblock) {
12863                                         SCTP_TCB_UNLOCK(stcb);
12864                                         hold_tcblock = 0;
12865                                 }
12866                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12867                                 if ((mm == NULL) || error) {
12868                                         if (mm) {
12869                                                 sctp_m_freem(mm);
12870                                         }
12871                                         goto out;
12872                                 }
12873                                 /* Update the mbuf and count */
12874                                 SCTP_TCB_SEND_LOCK(stcb);
12875                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12876                                         /*
12877                                          * we need to get out. Peer probably
12878                                          * aborted.
12879                                          */
12880                                         sctp_m_freem(mm);
12881                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12882                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12883                                                 error = ECONNRESET;
12884                                         }
12885                                         SCTP_TCB_SEND_UNLOCK(stcb);
12886                                         goto out;
12887                                 }
12888                                 if (sp->tail_mbuf) {
12889                                         /* tack it to the end */
12890                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12891                                         sp->tail_mbuf = new_tail;
12892                                 } else {
12893                                         /* A stolen mbuf */
12894                                         sp->data = mm;
12895                                         sp->tail_mbuf = new_tail;
12896                                 }
12897                                 sctp_snd_sb_alloc(stcb, sndout);
12898                                 atomic_add_int(&sp->length, sndout);
12899                                 len += sndout;
12900
12901                                 /* Did we reach EOR? */
12902                                 if ((uio->uio_resid == 0) &&
12903                                     ((user_marks_eor == 0) ||
12904                                     (srcv->sinfo_flags & SCTP_EOF) ||
12905                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12906                                         sp->msg_is_complete = 1;
12907                                 } else {
12908                                         sp->msg_is_complete = 0;
12909                                 }
12910                                 SCTP_TCB_SEND_UNLOCK(stcb);
12911                         }
12912                         if (uio->uio_resid == 0) {
12913                                 /* got it all? */
12914                                 continue;
12915                         }
12916                         /* PR-SCTP? */
12917                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12918                                 /*
12919                                  * This is ugly but we must assure locking
12920                                  * order
12921                                  */
12922                                 if (hold_tcblock == 0) {
12923                                         SCTP_TCB_LOCK(stcb);
12924                                         hold_tcblock = 1;
12925                                 }
12926                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12927                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12928                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12929                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12930                                 else
12931                                         max_len = 0;
12932                                 if (max_len > 0) {
12933                                         continue;
12934                                 }
12935                                 SCTP_TCB_UNLOCK(stcb);
12936                                 hold_tcblock = 0;
12937                         }
12938                         /* wait for space now */
12939                         if (non_blocking) {
12940                                 /* Non-blocking io in place out */
12941                                 goto skip_out_eof;
12942                         }
12943                         /* What about the INIT, send it maybe */
12944                         if (queue_only_for_init) {
12945                                 if (hold_tcblock == 0) {
12946                                         SCTP_TCB_LOCK(stcb);
12947                                         hold_tcblock = 1;
12948                                 }
12949                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12950                                         /* a collision took us forward? */
12951                                         queue_only = 0;
12952                                 } else {
12953                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12954                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12955                                         queue_only = 1;
12956                                 }
12957                         }
12958                         if ((net->flight_size > net->cwnd) &&
12959                             (asoc->sctp_cmt_on_off == 0)) {
12960                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12961                                 queue_only = 1;
12962                         } else if (asoc->ifp_had_enobuf) {
12963                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12964                                 if (net->flight_size > (2 * net->mtu)) {
12965                                         queue_only = 1;
12966                                 }
12967                                 asoc->ifp_had_enobuf = 0;
12968                         }
12969                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12970                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
12971                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12972                             (stcb->asoc.total_flight > 0) &&
12973                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12974                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
12975
12976                                 /*-
12977                                  * Ok, Nagle is set on and we have data outstanding.
12978                                  * Don't send anything and let SACKs drive out the
12979                                  * data unless wen have a "full" segment to send.
12980                                  */
12981                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12982                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12983                                 }
12984                                 SCTP_STAT_INCR(sctps_naglequeued);
12985                                 nagle_applies = 1;
12986                         } else {
12987                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
12988                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12989                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12990                                 }
12991                                 SCTP_STAT_INCR(sctps_naglesent);
12992                                 nagle_applies = 0;
12993                         }
12994                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12995
12996                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
12997                                     nagle_applies, un_sent);
12998                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
12999                                     stcb->asoc.total_flight,
13000                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13001                         }
13002                         if (queue_only_for_init)
13003                                 queue_only_for_init = 0;
13004                         if ((queue_only == 0) && (nagle_applies == 0)) {
13005                                 /*-
13006                                  * need to start chunk output
13007                                  * before blocking.. note that if
13008                                  * a lock is already applied, then
13009                                  * the input via the net is happening
13010                                  * and I don't need to start output :-D
13011                                  */
13012                                 if (hold_tcblock == 0) {
13013                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13014                                                 hold_tcblock = 1;
13015                                                 sctp_chunk_output(inp,
13016                                                     stcb,
13017                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13018                                         }
13019                                 } else {
13020                                         sctp_chunk_output(inp,
13021                                             stcb,
13022                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13023                                 }
13024                                 if (hold_tcblock == 1) {
13025                                         SCTP_TCB_UNLOCK(stcb);
13026                                         hold_tcblock = 0;
13027                                 }
13028                         }
13029                         SOCKBUF_LOCK(&so->so_snd);
13030                         /*-
13031                          * This is a bit strange, but I think it will
13032                          * work. The total_output_queue_size is locked and
13033                          * protected by the TCB_LOCK, which we just released.
13034                          * There is a race that can occur between releasing it
13035                          * above, and me getting the socket lock, where sacks
13036                          * come in but we have not put the SB_WAIT on the
13037                          * so_snd buffer to get the wakeup. After the LOCK
13038                          * is applied the sack_processing will also need to
13039                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13040                          * once we have the socket buffer lock if we recheck the
13041                          * size we KNOW we will get to sleep safely with the
13042                          * wakeup flag in place.
13043                          */
13044                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13045                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13046                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13047                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13048                                             asoc, uio->uio_resid);
13049                                 }
13050                                 be.error = 0;
13051                                 stcb->block_entry = &be;
13052                                 error = sbwait(&so->so_snd);
13053                                 stcb->block_entry = NULL;
13054
13055                                 if (error || so->so_error || be.error) {
13056                                         if (error == 0) {
13057                                                 if (so->so_error)
13058                                                         error = so->so_error;
13059                                                 if (be.error) {
13060                                                         error = be.error;
13061                                                 }
13062                                         }
13063                                         SOCKBUF_UNLOCK(&so->so_snd);
13064                                         goto out_unlocked;
13065                                 }
13066                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13067                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13068                                             asoc, stcb->asoc.total_output_queue_size);
13069                                 }
13070                         }
13071                         SOCKBUF_UNLOCK(&so->so_snd);
13072                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13073                                 goto out_unlocked;
13074                         }
13075                 }
13076                 SCTP_TCB_SEND_LOCK(stcb);
13077                 if (sp) {
13078                         if (sp->msg_is_complete == 0) {
13079                                 strm->last_msg_incomplete = 1;
13080                                 asoc->stream_locked = 1;
13081                                 asoc->stream_locked_on = srcv->sinfo_stream;
13082                         } else {
13083                                 sp->sender_all_done = 1;
13084                                 strm->last_msg_incomplete = 0;
13085                                 asoc->stream_locked = 0;
13086                         }
13087                 } else {
13088                         SCTP_PRINTF("Huh no sp TSNH?\n");
13089                         strm->last_msg_incomplete = 0;
13090                         asoc->stream_locked = 0;
13091                 }
13092                 SCTP_TCB_SEND_UNLOCK(stcb);
13093                 if (uio->uio_resid == 0) {
13094                         got_all_of_the_send = 1;
13095                 }
13096         } else {
13097                 /* We send in a 0, since we do NOT have any locks */
13098                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13099                 top = NULL;
13100                 if (srcv->sinfo_flags & SCTP_EOF) {
13101                         /*
13102                          * This should only happen for Panda for the mbuf
13103                          * send case, which does NOT yet support EEOR mode.
13104                          * Thus, we can just set this flag to do the proper
13105                          * EOF handling.
13106                          */
13107                         got_all_of_the_send = 1;
13108                 }
13109         }
13110         if (error) {
13111                 goto out;
13112         }
13113 dataless_eof:
13114         /* EOF thing ? */
13115         if ((srcv->sinfo_flags & SCTP_EOF) &&
13116             (got_all_of_the_send == 1)) {
13117                 int cnt;
13118
13119                 SCTP_STAT_INCR(sctps_sends_with_eof);
13120                 error = 0;
13121                 if (hold_tcblock == 0) {
13122                         SCTP_TCB_LOCK(stcb);
13123                         hold_tcblock = 1;
13124                 }
13125                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13126                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13127                     TAILQ_EMPTY(&asoc->sent_queue) &&
13128                     (cnt == 0)) {
13129                         if (asoc->locked_on_sending) {
13130                                 goto abort_anyway;
13131                         }
13132                         /* there is nothing queued to send, so I'm done... */
13133                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13134                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13135                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13136                                 struct sctp_nets *netp;
13137
13138                                 if (stcb->asoc.alternate) {
13139                                         netp = stcb->asoc.alternate;
13140                                 } else {
13141                                         netp = stcb->asoc.primary_destination;
13142                                 }
13143                                 /* only send SHUTDOWN the first time through */
13144                                 sctp_send_shutdown(stcb, netp);
13145                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13146                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13147                                 }
13148                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13149                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13150                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13151                                     netp);
13152                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13153                                     asoc->primary_destination);
13154                         }
13155                 } else {
13156                         /*-
13157                          * we still got (or just got) data to send, so set
13158                          * SHUTDOWN_PENDING
13159                          */
13160                         /*-
13161                          * XXX sockets draft says that SCTP_EOF should be
13162                          * sent with no data.  currently, we will allow user
13163                          * data to be sent first and move to
13164                          * SHUTDOWN-PENDING
13165                          */
13166                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13167                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13168                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13169                                 if (hold_tcblock == 0) {
13170                                         SCTP_TCB_LOCK(stcb);
13171                                         hold_tcblock = 1;
13172                                 }
13173                                 if (asoc->locked_on_sending) {
13174                                         /* Locked to send out the data */
13175                                         struct sctp_stream_queue_pending *sp;
13176
13177                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13178                                         if (sp) {
13179                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13180                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13181                                         }
13182                                 }
13183                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13184                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13185                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13186                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13187                         abort_anyway:
13188                                         if (free_cnt_applied) {
13189                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13190                                                 free_cnt_applied = 0;
13191                                         }
13192                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13193                                             NULL, SCTP_SO_LOCKED);
13194                                         /*
13195                                          * now relock the stcb so everything
13196                                          * is sane
13197                                          */
13198                                         hold_tcblock = 0;
13199                                         stcb = NULL;
13200                                         goto out;
13201                                 }
13202                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13203                                     asoc->primary_destination);
13204                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13205                         }
13206                 }
13207         }
13208 skip_out_eof:
13209         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13210                 some_on_control = 1;
13211         }
13212         if (queue_only_for_init) {
13213                 if (hold_tcblock == 0) {
13214                         SCTP_TCB_LOCK(stcb);
13215                         hold_tcblock = 1;
13216                 }
13217                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13218                         /* a collision took us forward? */
13219                         queue_only = 0;
13220                 } else {
13221                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13222                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13223                         queue_only = 1;
13224                 }
13225         }
13226         if ((net->flight_size > net->cwnd) &&
13227             (stcb->asoc.sctp_cmt_on_off == 0)) {
13228                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13229                 queue_only = 1;
13230         } else if (asoc->ifp_had_enobuf) {
13231                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13232                 if (net->flight_size > (2 * net->mtu)) {
13233                         queue_only = 1;
13234                 }
13235                 asoc->ifp_had_enobuf = 0;
13236         }
13237         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13238             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13239         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13240             (stcb->asoc.total_flight > 0) &&
13241             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13242             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13243                 /*-
13244                  * Ok, Nagle is set on and we have data outstanding.
13245                  * Don't send anything and let SACKs drive out the
13246                  * data unless wen have a "full" segment to send.
13247                  */
13248                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13249                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13250                 }
13251                 SCTP_STAT_INCR(sctps_naglequeued);
13252                 nagle_applies = 1;
13253         } else {
13254                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13255                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13256                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13257                 }
13258                 SCTP_STAT_INCR(sctps_naglesent);
13259                 nagle_applies = 0;
13260         }
13261         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13262                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13263                     nagle_applies, un_sent);
13264                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13265                     stcb->asoc.total_flight,
13266                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13267         }
13268         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13269                 /* we can attempt to send too. */
13270                 if (hold_tcblock == 0) {
13271                         /*
13272                          * If there is activity recv'ing sacks no need to
13273                          * send
13274                          */
13275                         if (SCTP_TCB_TRYLOCK(stcb)) {
13276                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13277                                 hold_tcblock = 1;
13278                         }
13279                 } else {
13280                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13281                 }
13282         } else if ((queue_only == 0) &&
13283                     (stcb->asoc.peers_rwnd == 0) &&
13284             (stcb->asoc.total_flight == 0)) {
13285                 /* We get to have a probe outstanding */
13286                 if (hold_tcblock == 0) {
13287                         hold_tcblock = 1;
13288                         SCTP_TCB_LOCK(stcb);
13289                 }
13290                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13291         } else if (some_on_control) {
13292                 int num_out, reason, frag_point;
13293
13294                 /* Here we do control only */
13295                 if (hold_tcblock == 0) {
13296                         hold_tcblock = 1;
13297                         SCTP_TCB_LOCK(stcb);
13298                 }
13299                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13300                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13301                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13302         }
13303         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13304             queue_only, stcb->asoc.peers_rwnd, un_sent,
13305             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13306             stcb->asoc.total_output_queue_size, error);
13307
13308 out:
13309 out_unlocked:
13310
13311         if (local_soresv && stcb) {
13312                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13313         }
13314         if (create_lock_applied) {
13315                 SCTP_ASOC_CREATE_UNLOCK(inp);
13316         }
13317         if ((stcb) && hold_tcblock) {
13318                 SCTP_TCB_UNLOCK(stcb);
13319         }
13320         if (stcb && free_cnt_applied) {
13321                 atomic_add_int(&stcb->asoc.refcnt, -1);
13322         }
13323 #ifdef INVARIANTS
13324         if (stcb) {
13325                 if (mtx_owned(&stcb->tcb_mtx)) {
13326                         panic("Leaving with tcb mtx owned?");
13327                 }
13328                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13329                         panic("Leaving with tcb send mtx owned?");
13330                 }
13331         }
13332 #endif
13333 #ifdef INVARIANTS
13334         if (inp) {
13335                 sctp_validate_no_locks(inp);
13336         } else {
13337                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13338         }
13339 #endif
13340         if (top) {
13341                 sctp_m_freem(top);
13342         }
13343         if (control) {
13344                 sctp_m_freem(control);
13345         }
13346         return (error);
13347 }
13348
13349
13350 /*
13351  * generate an AUTHentication chunk, if required
13352  */
13353 struct mbuf *
13354 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13355     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13356     struct sctp_tcb *stcb, uint8_t chunk)
13357 {
13358         struct mbuf *m_auth;
13359         struct sctp_auth_chunk *auth;
13360         int chunk_len;
13361         struct mbuf *cn;
13362
13363         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13364             (stcb == NULL))
13365                 return (m);
13366
13367         /* sysctl disabled auth? */
13368         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13369                 return (m);
13370
13371         /* peer doesn't do auth... */
13372         if (!stcb->asoc.peer_supports_auth) {
13373                 return (m);
13374         }
13375         /* does the requested chunk require auth? */
13376         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13377                 return (m);
13378         }
13379         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13380         if (m_auth == NULL) {
13381                 /* no mbuf's */
13382                 return (m);
13383         }
13384         /* reserve some space if this will be the first mbuf */
13385         if (m == NULL)
13386                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13387         /* fill in the AUTH chunk details */
13388         auth = mtod(m_auth, struct sctp_auth_chunk *);
13389         bzero(auth, sizeof(*auth));
13390         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13391         auth->ch.chunk_flags = 0;
13392         chunk_len = sizeof(*auth) +
13393             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13394         auth->ch.chunk_length = htons(chunk_len);
13395         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13396         /* key id and hmac digest will be computed and filled in upon send */
13397
13398         /* save the offset where the auth was inserted into the chain */
13399         *offset = 0;
13400         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13401                 *offset += SCTP_BUF_LEN(cn);
13402         }
13403
13404         /* update length and return pointer to the auth chunk */
13405         SCTP_BUF_LEN(m_auth) = chunk_len;
13406         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13407         if (auth_ret != NULL)
13408                 *auth_ret = auth;
13409
13410         return (m);
13411 }
13412
13413 #ifdef INET6
13414 int
13415 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13416 {
13417         struct nd_prefix *pfx = NULL;
13418         struct nd_pfxrouter *pfxrtr = NULL;
13419         struct sockaddr_in6 gw6;
13420
13421         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13422                 return (0);
13423
13424         /* get prefix entry of address */
13425         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13426                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13427                         continue;
13428                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13429                     &src6->sin6_addr, &pfx->ndpr_mask))
13430                         break;
13431         }
13432         /* no prefix entry in the prefix list */
13433         if (pfx == NULL) {
13434                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13435                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13436                 return (0);
13437         }
13438         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13439         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13440
13441         /* search installed gateway from prefix entry */
13442         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13443                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13444                 gw6.sin6_family = AF_INET6;
13445                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13446                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13447                     sizeof(struct in6_addr));
13448                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13449                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13450                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13451                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13452                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13453                     ro->ro_rt->rt_gateway)) {
13454                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13455                         return (1);
13456                 }
13457         }
13458         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13459         return (0);
13460 }
13461
13462 #endif
13463
13464 int
13465 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13466 {
13467 #ifdef INET
13468         struct sockaddr_in *sin, *mask;
13469         struct ifaddr *ifa;
13470         struct in_addr srcnetaddr, gwnetaddr;
13471
13472         if (ro == NULL || ro->ro_rt == NULL ||
13473             sifa->address.sa.sa_family != AF_INET) {
13474                 return (0);
13475         }
13476         ifa = (struct ifaddr *)sifa->ifa;
13477         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13478         sin = (struct sockaddr_in *)&sifa->address.sin;
13479         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13480         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13481         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13482         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13483
13484         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13485         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13486         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13487         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13488         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13489         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13490                 return (1);
13491         }
13492 #endif
13493         return (0);
13494 }