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 #ifdef  SCTP_PACKET_LOGGING
4118                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4119                                 sctp_packet_log(m, packet_length);
4120 #endif
4121                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4122                         if (port) {
4123 #if defined(SCTP_WITH_NO_CSUM)
4124                                 SCTP_STAT_INCR(sctps_sendnocrc);
4125 #else
4126                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
4127                                 SCTP_STAT_INCR(sctps_sendswcrc);
4128 #endif
4129                                 if (V_udp_cksum) {
4130                                         SCTP_ENABLE_UDP_CSUM(o_pak);
4131                                 }
4132                         } else {
4133 #if defined(SCTP_WITH_NO_CSUM)
4134                                 SCTP_STAT_INCR(sctps_sendnocrc);
4135 #else
4136                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
4137                                 m->m_pkthdr.csum_data = 0;
4138                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4139 #endif
4140                         }
4141                         /* send it out.  table id is taken from stcb */
4142 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4143                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4144                                 so = SCTP_INP_SO(inp);
4145                                 SCTP_SOCKET_UNLOCK(so, 0);
4146                         }
4147 #endif
4148                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
4149 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4150                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4151                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4152                                 SCTP_TCB_UNLOCK(stcb);
4153                                 SCTP_SOCKET_LOCK(so, 0);
4154                                 SCTP_TCB_LOCK(stcb);
4155                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4156                         }
4157 #endif
4158                         SCTP_STAT_INCR(sctps_sendpackets);
4159                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4160                         if (ret)
4161                                 SCTP_STAT_INCR(sctps_senderrors);
4162
4163                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
4164                         if (net == NULL) {
4165                                 /* free tempy routes */
4166                                 if (ro->ro_rt) {
4167                                         RTFREE(ro->ro_rt);
4168                                         ro->ro_rt = NULL;
4169                                 }
4170                         } else {
4171                                 /*
4172                                  * PMTU check versus smallest asoc MTU goes
4173                                  * here
4174                                  */
4175                                 if ((ro->ro_rt != NULL) &&
4176                                     (net->ro._s_addr)) {
4177                                         uint32_t mtu;
4178
4179                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4180                                         if (net->port) {
4181                                                 mtu -= sizeof(struct udphdr);
4182                                         }
4183                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
4184                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4185                                                 net->mtu = mtu;
4186                                         }
4187                                 } else if (ro->ro_rt == NULL) {
4188                                         /* route was freed */
4189                                         if (net->ro._s_addr &&
4190                                             net->src_addr_selected) {
4191                                                 sctp_free_ifa(net->ro._s_addr);
4192                                                 net->ro._s_addr = NULL;
4193                                         }
4194                                         net->src_addr_selected = 0;
4195                                 }
4196                         }
4197                         return (ret);
4198                 }
4199 #endif
4200 #ifdef INET6
4201         case AF_INET6:
4202                 {
4203                         uint32_t flowlabel, flowinfo;
4204                         struct ip6_hdr *ip6h;
4205                         struct route_in6 ip6route;
4206                         struct ifnet *ifp;
4207                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
4208                         int prev_scope = 0;
4209                         struct sockaddr_in6 lsa6_storage;
4210                         int error;
4211                         u_short prev_port = 0;
4212                         int len;
4213
4214                         if (net) {
4215                                 flowlabel = net->flowlabel;
4216                         } else if (stcb) {
4217                                 flowlabel = stcb->asoc.default_flowlabel;
4218                         } else {
4219                                 flowlabel = inp->sctp_ep.default_flowlabel;
4220                         }
4221                         if (flowlabel == 0) {
4222                                 /*
4223                                  * This means especially, that it is not set
4224                                  * at the SCTP layer. So use the value from
4225                                  * the IP layer.
4226                                  */
4227                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
4228                         }
4229                         flowlabel &= 0x000fffff;
4230                         len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr);
4231                         if (port) {
4232                                 len += sizeof(struct udphdr);
4233                         }
4234                         newm = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
4235                         if (newm == NULL) {
4236                                 sctp_m_freem(m);
4237                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4238                                 return (ENOMEM);
4239                         }
4240                         SCTP_ALIGN_TO_END(newm, len);
4241                         SCTP_BUF_LEN(newm) = len;
4242                         SCTP_BUF_NEXT(newm) = m;
4243                         m = newm;
4244                         if (net != NULL) {
4245 #ifdef INVARIANTS
4246                                 if (net->flowidset == 0) {
4247                                         panic("Flow ID not set");
4248                                 }
4249 #endif
4250                                 m->m_pkthdr.flowid = net->flowid;
4251                                 m->m_flags |= M_FLOWID;
4252                         } else {
4253                                 if (use_mflowid != 0) {
4254                                         m->m_pkthdr.flowid = mflowid;
4255                                         m->m_flags |= M_FLOWID;
4256                                 }
4257                         }
4258                         packet_length = sctp_calculate_len(m);
4259
4260                         ip6h = mtod(m, struct ip6_hdr *);
4261                         /* protect *sin6 from overwrite */
4262                         sin6 = (struct sockaddr_in6 *)to;
4263                         tmp = *sin6;
4264                         sin6 = &tmp;
4265
4266                         /* KAME hack: embed scopeid */
4267                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4268                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4269                                 return (EINVAL);
4270                         }
4271                         if (net == NULL) {
4272                                 memset(&ip6route, 0, sizeof(ip6route));
4273                                 ro = (sctp_route_t *) & ip6route;
4274                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
4275                         } else {
4276                                 ro = (sctp_route_t *) & net->ro;
4277                         }
4278                         /*
4279                          * We assume here that inp_flow is in host byte
4280                          * order within the TCB!
4281                          */
4282                         if (tos_value == 0) {
4283                                 /*
4284                                  * This means especially, that it is not set
4285                                  * at the SCTP layer. So use the value from
4286                                  * the IP layer.
4287                                  */
4288                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
4289                         }
4290                         tos_value &= 0xfc;
4291                         if (ecn_ok) {
4292                                 tos_value |= sctp_get_ect(stcb);
4293                         }
4294                         flowinfo = 0x06;
4295                         flowinfo <<= 8;
4296                         flowinfo |= tos_value;
4297                         flowinfo <<= 20;
4298                         flowinfo |= flowlabel;
4299                         ip6h->ip6_flow = htonl(flowinfo);
4300                         if (port) {
4301                                 ip6h->ip6_nxt = IPPROTO_UDP;
4302                         } else {
4303                                 ip6h->ip6_nxt = IPPROTO_SCTP;
4304                         }
4305                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
4306                         ip6h->ip6_dst = sin6->sin6_addr;
4307
4308                         /*
4309                          * Add SRC address selection here: we can only reuse
4310                          * to a limited degree the kame src-addr-sel, since
4311                          * we can try their selection but it may not be
4312                          * bound.
4313                          */
4314                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
4315                         lsa6_tmp.sin6_family = AF_INET6;
4316                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
4317                         lsa6 = &lsa6_tmp;
4318                         if (net && out_of_asoc_ok == 0) {
4319                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
4320                                         sctp_free_ifa(net->ro._s_addr);
4321                                         net->ro._s_addr = NULL;
4322                                         net->src_addr_selected = 0;
4323                                         if (ro->ro_rt) {
4324                                                 RTFREE(ro->ro_rt);
4325                                                 ro->ro_rt = NULL;
4326                                         }
4327                                 }
4328                                 if (net->src_addr_selected == 0) {
4329                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4330                                         /* KAME hack: embed scopeid */
4331                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4332                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4333                                                 return (EINVAL);
4334                                         }
4335                                         /* Cache the source address */
4336                                         net->ro._s_addr = sctp_source_address_selection(inp,
4337                                             stcb,
4338                                             ro,
4339                                             net,
4340                                             0,
4341                                             vrf_id);
4342                                         (void)sa6_recoverscope(sin6);
4343                                         net->src_addr_selected = 1;
4344                                 }
4345                                 if (net->ro._s_addr == NULL) {
4346                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
4347                                         net->src_addr_selected = 0;
4348                                         sctp_handle_no_route(stcb, net, so_locked);
4349                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4350                                         sctp_m_freem(m);
4351                                         return (EHOSTUNREACH);
4352                                 }
4353                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
4354                         } else {
4355                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
4356                                 /* KAME hack: embed scopeid */
4357                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
4358                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
4359                                         return (EINVAL);
4360                                 }
4361                                 if (over_addr == NULL) {
4362                                         struct sctp_ifa *_lsrc;
4363
4364                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
4365                                             net,
4366                                             out_of_asoc_ok,
4367                                             vrf_id);
4368                                         if (_lsrc == NULL) {
4369                                                 sctp_handle_no_route(stcb, net, so_locked);
4370                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4371                                                 sctp_m_freem(m);
4372                                                 return (EHOSTUNREACH);
4373                                         }
4374                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
4375                                         sctp_free_ifa(_lsrc);
4376                                 } else {
4377                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
4378                                         SCTP_RTALLOC(ro, vrf_id);
4379                                 }
4380                                 (void)sa6_recoverscope(sin6);
4381                         }
4382                         lsa6->sin6_port = inp->sctp_lport;
4383
4384                         if (ro->ro_rt == NULL) {
4385                                 /*
4386                                  * src addr selection failed to find a route
4387                                  * (or valid source addr), so we can't get
4388                                  * there from here!
4389                                  */
4390                                 sctp_handle_no_route(stcb, net, so_locked);
4391                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4392                                 sctp_m_freem(m);
4393                                 return (EHOSTUNREACH);
4394                         }
4395                         /*
4396                          * XXX: sa6 may not have a valid sin6_scope_id in
4397                          * the non-SCOPEDROUTING case.
4398                          */
4399                         bzero(&lsa6_storage, sizeof(lsa6_storage));
4400                         lsa6_storage.sin6_family = AF_INET6;
4401                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
4402                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4403                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
4404                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
4405                                 sctp_m_freem(m);
4406                                 return (error);
4407                         }
4408                         /* XXX */
4409                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
4410                         lsa6_storage.sin6_port = inp->sctp_lport;
4411                         lsa6 = &lsa6_storage;
4412                         ip6h->ip6_src = lsa6->sin6_addr;
4413
4414                         if (port) {
4415                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
4416                                         sctp_handle_no_route(stcb, net, so_locked);
4417                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
4418                                         sctp_m_freem(m);
4419                                         return (EHOSTUNREACH);
4420                                 }
4421                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4422                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
4423                                 udp->uh_dport = port;
4424                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
4425                                 udp->uh_sum = 0;
4426                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
4427                         } else {
4428                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
4429                         }
4430
4431                         sctphdr->src_port = src_port;
4432                         sctphdr->dest_port = dest_port;
4433                         sctphdr->v_tag = v_tag;
4434                         sctphdr->checksum = 0;
4435
4436                         /*
4437                          * We set the hop limit now since there is a good
4438                          * chance that our ro pointer is now filled
4439                          */
4440                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
4441                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
4442
4443 #ifdef SCTP_DEBUG
4444                         /* Copy to be sure something bad is not happening */
4445                         sin6->sin6_addr = ip6h->ip6_dst;
4446                         lsa6->sin6_addr = ip6h->ip6_src;
4447 #endif
4448
4449                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
4450                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
4451                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
4452                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
4453                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
4454                         if (net) {
4455                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
4456                                 /*
4457                                  * preserve the port and scope for link
4458                                  * local send
4459                                  */
4460                                 prev_scope = sin6->sin6_scope_id;
4461                                 prev_port = sin6->sin6_port;
4462                         }
4463                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
4464                                 /* failed to prepend data, give up */
4465                                 sctp_m_freem(m);
4466                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
4467                                 return (ENOMEM);
4468                         }
4469 #ifdef  SCTP_PACKET_LOGGING
4470                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
4471                                 sctp_packet_log(m, packet_length);
4472 #endif
4473                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
4474                         if (port) {
4475 #if defined(SCTP_WITH_NO_CSUM)
4476                                 SCTP_STAT_INCR(sctps_sendnocrc);
4477 #else
4478                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
4479                                 SCTP_STAT_INCR(sctps_sendswcrc);
4480 #endif
4481                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
4482                                         udp->uh_sum = 0xffff;
4483                                 }
4484                         } else {
4485 #if defined(SCTP_WITH_NO_CSUM)
4486                                 SCTP_STAT_INCR(sctps_sendnocrc);
4487 #else
4488                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
4489                                 m->m_pkthdr.csum_data = 0;
4490                                 SCTP_STAT_INCR(sctps_sendhwcrc);
4491 #endif
4492                         }
4493                         /* send it out. table id is taken from stcb */
4494 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4495                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4496                                 so = SCTP_INP_SO(inp);
4497                                 SCTP_SOCKET_UNLOCK(so, 0);
4498                         }
4499 #endif
4500                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
4501 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4502                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
4503                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4504                                 SCTP_TCB_UNLOCK(stcb);
4505                                 SCTP_SOCKET_LOCK(so, 0);
4506                                 SCTP_TCB_LOCK(stcb);
4507                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4508                         }
4509 #endif
4510                         if (net) {
4511                                 /* for link local this must be done */
4512                                 sin6->sin6_scope_id = prev_scope;
4513                                 sin6->sin6_port = prev_port;
4514                         }
4515                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
4516                         SCTP_STAT_INCR(sctps_sendpackets);
4517                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
4518                         if (ret) {
4519                                 SCTP_STAT_INCR(sctps_senderrors);
4520                         }
4521                         if (net == NULL) {
4522                                 /* Now if we had a temp route free it */
4523                                 if (ro->ro_rt) {
4524                                         RTFREE(ro->ro_rt);
4525                                 }
4526                         } else {
4527                                 /*
4528                                  * PMTU check versus smallest asoc MTU goes
4529                                  * here
4530                                  */
4531                                 if (ro->ro_rt == NULL) {
4532                                         /* Route was freed */
4533                                         if (net->ro._s_addr &&
4534                                             net->src_addr_selected) {
4535                                                 sctp_free_ifa(net->ro._s_addr);
4536                                                 net->ro._s_addr = NULL;
4537                                         }
4538                                         net->src_addr_selected = 0;
4539                                 }
4540                                 if ((ro->ro_rt != NULL) &&
4541                                     (net->ro._s_addr)) {
4542                                         uint32_t mtu;
4543
4544                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
4545                                         if (mtu &&
4546                                             (stcb->asoc.smallest_mtu > mtu)) {
4547                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
4548                                                 net->mtu = mtu;
4549                                                 if (net->port) {
4550                                                         net->mtu -= sizeof(struct udphdr);
4551                                                 }
4552                                         }
4553                                 } else if (ifp) {
4554                                         if (ND_IFINFO(ifp)->linkmtu &&
4555                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
4556                                                 sctp_mtu_size_reset(inp,
4557                                                     &stcb->asoc,
4558                                                     ND_IFINFO(ifp)->linkmtu);
4559                                         }
4560                                 }
4561                         }
4562                         return (ret);
4563                 }
4564 #endif
4565         default:
4566                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
4567                     ((struct sockaddr *)to)->sa_family);
4568                 sctp_m_freem(m);
4569                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
4570                 return (EFAULT);
4571         }
4572 }
4573
4574
4575 void
4576 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
4577 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
4578     SCTP_UNUSED
4579 #endif
4580 )
4581 {
4582         struct mbuf *m, *m_at, *mp_last;
4583         struct sctp_nets *net;
4584         struct sctp_init_chunk *init;
4585         struct sctp_supported_addr_param *sup_addr;
4586         struct sctp_adaptation_layer_indication *ali;
4587         struct sctp_ecn_supported_param *ecn;
4588         struct sctp_prsctp_supported_param *prsctp;
4589         struct sctp_supported_chunk_types_param *pr_supported;
4590         int cnt_inits_to = 0;
4591         int padval, ret;
4592         int num_ext;
4593         int p_len;
4594
4595         /* INIT's always go to the primary (and usually ONLY address) */
4596         mp_last = NULL;
4597         net = stcb->asoc.primary_destination;
4598         if (net == NULL) {
4599                 net = TAILQ_FIRST(&stcb->asoc.nets);
4600                 if (net == NULL) {
4601                         /* TSNH */
4602                         return;
4603                 }
4604                 /* we confirm any address we send an INIT to */
4605                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4606                 (void)sctp_set_primary_addr(stcb, NULL, net);
4607         } else {
4608                 /* we confirm any address we send an INIT to */
4609                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
4610         }
4611         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
4612 #ifdef INET6
4613         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
4614                 /*
4615                  * special hook, if we are sending to link local it will not
4616                  * show up in our private address count.
4617                  */
4618                 struct sockaddr_in6 *sin6l;
4619
4620                 sin6l = &net->ro._l_addr.sin6;
4621                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
4622                         cnt_inits_to = 1;
4623         }
4624 #endif
4625         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
4626                 /* This case should not happen */
4627                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
4628                 return;
4629         }
4630         /* start the INIT timer */
4631         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
4632
4633         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
4634         if (m == NULL) {
4635                 /* No memory, INIT timer will re-attempt. */
4636                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
4637                 return;
4638         }
4639         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
4640         /*
4641          * assume peer supports asconf in order to be able to queue local
4642          * address changes while an INIT is in flight and before the assoc
4643          * is established.
4644          */
4645         stcb->asoc.peer_supports_asconf = 1;
4646         /* Now lets put the SCTP header in place */
4647         init = mtod(m, struct sctp_init_chunk *);
4648         /* now the chunk header */
4649         init->ch.chunk_type = SCTP_INITIATION;
4650         init->ch.chunk_flags = 0;
4651         /* fill in later from mbuf we build */
4652         init->ch.chunk_length = 0;
4653         /* place in my tag */
4654         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
4655         /* set up some of the credits. */
4656         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
4657             SCTP_MINIMAL_RWND));
4658
4659         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
4660         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
4661         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
4662         /* now the address restriction */
4663         /* XXX Should we take the address family of the socket into account? */
4664         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)init +
4665             sizeof(*init));
4666         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
4667 #ifdef INET6
4668 #ifdef INET
4669         /* we support 2 types: IPv4/IPv6 */
4670         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + 2 * sizeof(uint16_t));
4671         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4672         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
4673 #else
4674         /* we support 1 type: IPv6 */
4675         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4676         sup_addr->addr_type[0] = htons(SCTP_IPV6_ADDRESS);
4677         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4678 #endif
4679 #else
4680         /* we support 1 type: IPv4 */
4681         sup_addr->ph.param_length = htons(sizeof(struct sctp_paramhdr) + sizeof(uint16_t));
4682         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
4683         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
4684 #endif
4685         SCTP_BUF_LEN(m) += sizeof(struct sctp_supported_addr_param);
4686         /* adaptation layer indication parameter */
4687         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)sup_addr + sizeof(struct sctp_supported_addr_param));
4688         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
4689         ali->ph.param_length = htons(sizeof(*ali));
4690         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
4691         SCTP_BUF_LEN(m) += sizeof(*ali);
4692         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
4693
4694         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
4695                 /* Add NAT friendly parameter */
4696                 struct sctp_paramhdr *ph;
4697
4698                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4699                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
4700                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
4701                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
4702                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ph + sizeof(*ph));
4703         }
4704         /* now any cookie time extensions */
4705         if (stcb->asoc.cookie_preserve_req) {
4706                 struct sctp_cookie_perserve_param *cookie_preserve;
4707
4708                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
4709                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
4710                 cookie_preserve->ph.param_length = htons(
4711                     sizeof(*cookie_preserve));
4712                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
4713                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
4714                 ecn = (struct sctp_ecn_supported_param *)(
4715                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
4716                 stcb->asoc.cookie_preserve_req = 0;
4717         }
4718         /* ECN parameter */
4719         if (stcb->asoc.ecn_allowed == 1) {
4720                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
4721                 ecn->ph.param_length = htons(sizeof(*ecn));
4722                 SCTP_BUF_LEN(m) += sizeof(*ecn);
4723                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
4724                     sizeof(*ecn));
4725         } else {
4726                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
4727         }
4728         /* And now tell the peer we do pr-sctp */
4729         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
4730         prsctp->ph.param_length = htons(sizeof(*prsctp));
4731         SCTP_BUF_LEN(m) += sizeof(*prsctp);
4732
4733         /* And now tell the peer we do all the extensions */
4734         pr_supported = (struct sctp_supported_chunk_types_param *)
4735             ((caddr_t)prsctp + sizeof(*prsctp));
4736         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
4737         num_ext = 0;
4738         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
4739         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
4740         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
4741         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
4742         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
4743         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4744                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
4745         }
4746         if (stcb->asoc.sctp_nr_sack_on_off == 1) {
4747                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
4748         }
4749         p_len = sizeof(*pr_supported) + num_ext;
4750         pr_supported->ph.param_length = htons(p_len);
4751         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
4752         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4753
4754
4755         /* add authentication parameters */
4756         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4757                 struct sctp_auth_random *randp;
4758                 struct sctp_auth_hmac_algo *hmacs;
4759                 struct sctp_auth_chunk_list *chunks;
4760
4761                 /* attach RANDOM parameter, if available */
4762                 if (stcb->asoc.authinfo.random != NULL) {
4763                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4764                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
4765                         /* random key already contains the header */
4766                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
4767                         /* zero out any padding required */
4768                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
4769                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4770                 }
4771                 /* add HMAC_ALGO parameter */
4772                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4773                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
4774                     (uint8_t *) hmacs->hmac_ids);
4775                 if (p_len > 0) {
4776                         p_len += sizeof(*hmacs);
4777                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
4778                         hmacs->ph.param_length = htons(p_len);
4779                         /* zero out any padding required */
4780                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
4781                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4782                 }
4783                 /* add CHUNKS parameter */
4784                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
4785                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
4786                     chunks->chunk_types);
4787                 if (p_len > 0) {
4788                         p_len += sizeof(*chunks);
4789                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
4790                         chunks->ph.param_length = htons(p_len);
4791                         /* zero out any padding required */
4792                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
4793                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
4794                 }
4795         }
4796         /* now the addresses */
4797         {
4798                 struct sctp_scoping scp;
4799
4800                 /*
4801                  * To optimize this we could put the scoping stuff into a
4802                  * structure and remove the individual uint8's from the
4803                  * assoc structure. Then we could just sifa in the address
4804                  * within the stcb. But for now this is a quick hack to get
4805                  * the address stuff teased apart.
4806                  */
4807
4808                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
4809                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
4810                 scp.loopback_scope = stcb->asoc.loopback_scope;
4811                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
4812                 scp.local_scope = stcb->asoc.local_scope;
4813                 scp.site_scope = stcb->asoc.site_scope;
4814
4815                 sctp_add_addresses_to_i_ia(inp, stcb, &scp, m, cnt_inits_to);
4816         }
4817
4818         /* calulate the size and update pkt header and chunk header */
4819         p_len = 0;
4820         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
4821                 if (SCTP_BUF_NEXT(m_at) == NULL)
4822                         mp_last = m_at;
4823                 p_len += SCTP_BUF_LEN(m_at);
4824         }
4825         init->ch.chunk_length = htons(p_len);
4826         /*
4827          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
4828          * here since the timer will drive a retranmission.
4829          */
4830
4831         /* I don't expect this to execute but we will be safe here */
4832         padval = p_len % 4;
4833         if ((padval) && (mp_last)) {
4834                 /*
4835                  * The compiler worries that mp_last may not be set even
4836                  * though I think it is impossible :-> however we add
4837                  * mp_last here just in case.
4838                  */
4839                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
4840                 if (ret) {
4841                         /* Houston we have a problem, no space */
4842                         sctp_m_freem(m);
4843                         return;
4844                 }
4845         }
4846         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
4847         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
4848             (struct sockaddr *)&net->ro._l_addr,
4849             m, 0, NULL, 0, 0, 0, 0,
4850             inp->sctp_lport, stcb->rport, htonl(0),
4851             net->port, NULL,
4852             0, 0,
4853             so_locked);
4854         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
4855         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
4856         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
4857 }
4858
4859 struct mbuf *
4860 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
4861     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
4862 {
4863         /*
4864          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
4865          * being equal to the beginning of the params i.e. (iphlen +
4866          * sizeof(struct sctp_init_msg) parse through the parameters to the
4867          * end of the mbuf verifying that all parameters are known.
4868          *
4869          * For unknown parameters build and return a mbuf with
4870          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
4871          * processing this chunk stop, and set *abort_processing to 1.
4872          *
4873          * By having param_offset be pre-set to where parameters begin it is
4874          * hoped that this routine may be reused in the future by new
4875          * features.
4876          */
4877         struct sctp_paramhdr *phdr, params;
4878
4879         struct mbuf *mat, *op_err;
4880         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
4881         int at, limit, pad_needed;
4882         uint16_t ptype, plen, padded_size;
4883         int err_at;
4884
4885         *abort_processing = 0;
4886         mat = in_initpkt;
4887         err_at = 0;
4888         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
4889         at = param_offset;
4890         op_err = NULL;
4891         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
4892         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
4893         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
4894                 ptype = ntohs(phdr->param_type);
4895                 plen = ntohs(phdr->param_length);
4896                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
4897                         /* wacked parameter */
4898                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
4899                         goto invalid_size;
4900                 }
4901                 limit -= SCTP_SIZE32(plen);
4902                 /*-
4903                  * All parameters for all chunks that we know/understand are
4904                  * listed here. We process them other places and make
4905                  * appropriate stop actions per the upper bits. However this
4906                  * is the generic routine processor's can call to get back
4907                  * an operr.. to either incorporate (init-ack) or send.
4908                  */
4909                 padded_size = SCTP_SIZE32(plen);
4910                 switch (ptype) {
4911                         /* Param's with variable size */
4912                 case SCTP_HEARTBEAT_INFO:
4913                 case SCTP_STATE_COOKIE:
4914                 case SCTP_UNRECOG_PARAM:
4915                 case SCTP_ERROR_CAUSE_IND:
4916                         /* ok skip fwd */
4917                         at += padded_size;
4918                         break;
4919                         /* Param's with variable size within a range */
4920                 case SCTP_CHUNK_LIST:
4921                 case SCTP_SUPPORTED_CHUNK_EXT:
4922                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
4923                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
4924                                 goto invalid_size;
4925                         }
4926                         at += padded_size;
4927                         break;
4928                 case SCTP_SUPPORTED_ADDRTYPE:
4929                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
4930                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
4931                                 goto invalid_size;
4932                         }
4933                         at += padded_size;
4934                         break;
4935                 case SCTP_RANDOM:
4936                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
4937                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
4938                                 goto invalid_size;
4939                         }
4940                         at += padded_size;
4941                         break;
4942                 case SCTP_SET_PRIM_ADDR:
4943                 case SCTP_DEL_IP_ADDRESS:
4944                 case SCTP_ADD_IP_ADDRESS:
4945                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
4946                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
4947                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
4948                                 goto invalid_size;
4949                         }
4950                         at += padded_size;
4951                         break;
4952                         /* Param's with a fixed size */
4953                 case SCTP_IPV4_ADDRESS:
4954                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
4955                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
4956                                 goto invalid_size;
4957                         }
4958                         at += padded_size;
4959                         break;
4960                 case SCTP_IPV6_ADDRESS:
4961                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
4962                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
4963                                 goto invalid_size;
4964                         }
4965                         at += padded_size;
4966                         break;
4967                 case SCTP_COOKIE_PRESERVE:
4968                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
4969                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
4970                                 goto invalid_size;
4971                         }
4972                         at += padded_size;
4973                         break;
4974                 case SCTP_HAS_NAT_SUPPORT:
4975                         *nat_friendly = 1;
4976                         /* fall through */
4977                 case SCTP_PRSCTP_SUPPORTED:
4978
4979                         if (padded_size != sizeof(struct sctp_paramhdr)) {
4980                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
4981                                 goto invalid_size;
4982                         }
4983                         at += padded_size;
4984                         break;
4985                 case SCTP_ECN_CAPABLE:
4986                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
4987                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
4988                                 goto invalid_size;
4989                         }
4990                         at += padded_size;
4991                         break;
4992                 case SCTP_ULP_ADAPTATION:
4993                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
4994                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
4995                                 goto invalid_size;
4996                         }
4997                         at += padded_size;
4998                         break;
4999                 case SCTP_SUCCESS_REPORT:
5000                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
5001                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
5002                                 goto invalid_size;
5003                         }
5004                         at += padded_size;
5005                         break;
5006                 case SCTP_HOSTNAME_ADDRESS:
5007                         {
5008                                 /* We can NOT handle HOST NAME addresses!! */
5009                                 int l_len;
5010
5011                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
5012                                 *abort_processing = 1;
5013                                 if (op_err == NULL) {
5014                                         /* Ok need to try to get a mbuf */
5015 #ifdef INET6
5016                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5017 #else
5018                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5019 #endif
5020                                         l_len += plen;
5021                                         l_len += sizeof(struct sctp_paramhdr);
5022                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5023                                         if (op_err) {
5024                                                 SCTP_BUF_LEN(op_err) = 0;
5025                                                 /*
5026                                                  * pre-reserve space for ip
5027                                                  * and sctp header  and
5028                                                  * chunk hdr
5029                                                  */
5030 #ifdef INET6
5031                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5032 #else
5033                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5034 #endif
5035                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5036                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5037                                         }
5038                                 }
5039                                 if (op_err) {
5040                                         /* If we have space */
5041                                         struct sctp_paramhdr s;
5042
5043                                         if (err_at % 4) {
5044                                                 uint32_t cpthis = 0;
5045
5046                                                 pad_needed = 4 - (err_at % 4);
5047                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5048                                                 err_at += pad_needed;
5049                                         }
5050                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
5051                                         s.param_length = htons(sizeof(s) + plen);
5052                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5053                                         err_at += sizeof(s);
5054                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5055                                         if (phdr == NULL) {
5056                                                 sctp_m_freem(op_err);
5057                                                 /*
5058                                                  * we are out of memory but
5059                                                  * we still need to have a
5060                                                  * look at what to do (the
5061                                                  * system is in trouble
5062                                                  * though).
5063                                                  */
5064                                                 return (NULL);
5065                                         }
5066                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5067                                 }
5068                                 return (op_err);
5069                                 break;
5070                         }
5071                 default:
5072                         /*
5073                          * we do not recognize the parameter figure out what
5074                          * we do.
5075                          */
5076                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
5077                         if ((ptype & 0x4000) == 0x4000) {
5078                                 /* Report bit is set?? */
5079                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
5080                                 if (op_err == NULL) {
5081                                         int l_len;
5082
5083                                         /* Ok need to try to get an mbuf */
5084 #ifdef INET6
5085                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5086 #else
5087                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5088 #endif
5089                                         l_len += plen;
5090                                         l_len += sizeof(struct sctp_paramhdr);
5091                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5092                                         if (op_err) {
5093                                                 SCTP_BUF_LEN(op_err) = 0;
5094 #ifdef INET6
5095                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5096 #else
5097                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5098 #endif
5099                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5100                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5101                                         }
5102                                 }
5103                                 if (op_err) {
5104                                         /* If we have space */
5105                                         struct sctp_paramhdr s;
5106
5107                                         if (err_at % 4) {
5108                                                 uint32_t cpthis = 0;
5109
5110                                                 pad_needed = 4 - (err_at % 4);
5111                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5112                                                 err_at += pad_needed;
5113                                         }
5114                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
5115                                         s.param_length = htons(sizeof(s) + plen);
5116                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5117                                         err_at += sizeof(s);
5118                                         if (plen > sizeof(tempbuf)) {
5119                                                 plen = sizeof(tempbuf);
5120                                         }
5121                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
5122                                         if (phdr == NULL) {
5123                                                 sctp_m_freem(op_err);
5124                                                 /*
5125                                                  * we are out of memory but
5126                                                  * we still need to have a
5127                                                  * look at what to do (the
5128                                                  * system is in trouble
5129                                                  * though).
5130                                                  */
5131                                                 op_err = NULL;
5132                                                 goto more_processing;
5133                                         }
5134                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
5135                                         err_at += plen;
5136                                 }
5137                         }
5138         more_processing:
5139                         if ((ptype & 0x8000) == 0x0000) {
5140                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
5141                                 return (op_err);
5142                         } else {
5143                                 /* skip this chunk and continue processing */
5144                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
5145                                 at += SCTP_SIZE32(plen);
5146                         }
5147                         break;
5148
5149                 }
5150                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
5151         }
5152         return (op_err);
5153 invalid_size:
5154         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
5155         *abort_processing = 1;
5156         if ((op_err == NULL) && phdr) {
5157                 int l_len;
5158
5159 #ifdef INET6
5160                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5161 #else
5162                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5163 #endif
5164                 l_len += (2 * sizeof(struct sctp_paramhdr));
5165                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
5166                 if (op_err) {
5167                         SCTP_BUF_LEN(op_err) = 0;
5168 #ifdef INET6
5169                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
5170 #else
5171                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
5172 #endif
5173                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
5174                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
5175                 }
5176         }
5177         if ((op_err) && phdr) {
5178                 struct sctp_paramhdr s;
5179
5180                 if (err_at % 4) {
5181                         uint32_t cpthis = 0;
5182
5183                         pad_needed = 4 - (err_at % 4);
5184                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
5185                         err_at += pad_needed;
5186                 }
5187                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
5188                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
5189                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
5190                 err_at += sizeof(s);
5191                 /* Only copy back the p-hdr that caused the issue */
5192                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
5193         }
5194         return (op_err);
5195 }
5196
5197 static int
5198 sctp_are_there_new_addresses(struct sctp_association *asoc,
5199     struct mbuf *in_initpkt, int offset)
5200 {
5201         /*
5202          * Given a INIT packet, look through the packet to verify that there
5203          * are NO new addresses. As we go through the parameters add reports
5204          * of any un-understood parameters that require an error.  Also we
5205          * must return (1) to drop the packet if we see a un-understood
5206          * parameter that tells us to drop the chunk.
5207          */
5208         struct sockaddr *sa_touse;
5209         struct sockaddr *sa;
5210         struct sctp_paramhdr *phdr, params;
5211         uint16_t ptype, plen;
5212         uint8_t fnd;
5213         struct sctp_nets *net;
5214         struct ip *iph;
5215
5216 #ifdef INET
5217         struct sockaddr_in sin4, *sa4;
5218
5219 #endif
5220 #ifdef INET6
5221         struct sockaddr_in6 sin6, *sa6;
5222         struct ip6_hdr *ip6h;
5223
5224 #endif
5225
5226 #ifdef INET
5227         memset(&sin4, 0, sizeof(sin4));
5228         sin4.sin_family = AF_INET;
5229         sin4.sin_len = sizeof(sin4);
5230 #endif
5231 #ifdef INET6
5232         memset(&sin6, 0, sizeof(sin6));
5233         sin6.sin6_family = AF_INET6;
5234         sin6.sin6_len = sizeof(sin6);
5235 #endif
5236         sa_touse = NULL;
5237         /* First what about the src address of the pkt ? */
5238         iph = mtod(in_initpkt, struct ip *);
5239         switch (iph->ip_v) {
5240 #ifdef INET
5241         case IPVERSION:
5242                 /* source addr is IPv4 */
5243                 sin4.sin_addr = iph->ip_src;
5244                 sa_touse = (struct sockaddr *)&sin4;
5245                 break;
5246 #endif
5247 #ifdef INET6
5248         case IPV6_VERSION >> 4:
5249                 /* source addr is IPv6 */
5250                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
5251                 sin6.sin6_addr = ip6h->ip6_src;
5252                 sa_touse = (struct sockaddr *)&sin6;
5253                 break;
5254 #endif
5255         default:
5256                 return (1);
5257         }
5258
5259         fnd = 0;
5260         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5261                 sa = (struct sockaddr *)&net->ro._l_addr;
5262                 if (sa->sa_family == sa_touse->sa_family) {
5263 #ifdef INET
5264                         if (sa->sa_family == AF_INET) {
5265                                 sa4 = (struct sockaddr_in *)sa;
5266                                 if (sa4->sin_addr.s_addr == sin4.sin_addr.s_addr) {
5267                                         fnd = 1;
5268                                         break;
5269                                 }
5270                         }
5271 #endif
5272 #ifdef INET6
5273                         if (sa->sa_family == AF_INET6) {
5274                                 sa6 = (struct sockaddr_in6 *)sa;
5275                                 if (SCTP6_ARE_ADDR_EQUAL(sa6, &sin6)) {
5276                                         fnd = 1;
5277                                         break;
5278                                 }
5279                         }
5280 #endif
5281                 }
5282         }
5283         if (fnd == 0) {
5284                 /* New address added! no need to look futher. */
5285                 return (1);
5286         }
5287         /* Ok so far lets munge through the rest of the packet */
5288         offset += sizeof(struct sctp_init_chunk);
5289         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5290         while (phdr) {
5291                 sa_touse = NULL;
5292                 ptype = ntohs(phdr->param_type);
5293                 plen = ntohs(phdr->param_length);
5294                 switch (ptype) {
5295 #ifdef INET
5296                 case SCTP_IPV4_ADDRESS:
5297                         {
5298                                 struct sctp_ipv4addr_param *p4, p4_buf;
5299
5300                                 phdr = sctp_get_next_param(in_initpkt, offset,
5301                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
5302                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
5303                                     phdr == NULL) {
5304                                         return (1);
5305                                 }
5306                                 p4 = (struct sctp_ipv4addr_param *)phdr;
5307                                 sin4.sin_addr.s_addr = p4->addr;
5308                                 sa_touse = (struct sockaddr *)&sin4;
5309                                 break;
5310                         }
5311 #endif
5312 #ifdef INET6
5313                 case SCTP_IPV6_ADDRESS:
5314                         {
5315                                 struct sctp_ipv6addr_param *p6, p6_buf;
5316
5317                                 phdr = sctp_get_next_param(in_initpkt, offset,
5318                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
5319                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
5320                                     phdr == NULL) {
5321                                         return (1);
5322                                 }
5323                                 p6 = (struct sctp_ipv6addr_param *)phdr;
5324                                 memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
5325                                     sizeof(p6->addr));
5326                                 sa_touse = (struct sockaddr *)&sin6;
5327                                 break;
5328                         }
5329 #endif
5330                 default:
5331                         sa_touse = NULL;
5332                         break;
5333                 }
5334                 if (sa_touse) {
5335                         /* ok, sa_touse points to one to check */
5336                         fnd = 0;
5337                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
5338                                 sa = (struct sockaddr *)&net->ro._l_addr;
5339                                 if (sa->sa_family != sa_touse->sa_family) {
5340                                         continue;
5341                                 }
5342 #ifdef INET
5343                                 if (sa->sa_family == AF_INET) {
5344                                         sa4 = (struct sockaddr_in *)sa;
5345                                         if (sa4->sin_addr.s_addr ==
5346                                             sin4.sin_addr.s_addr) {
5347                                                 fnd = 1;
5348                                                 break;
5349                                         }
5350                                 }
5351 #endif
5352 #ifdef INET6
5353                                 if (sa->sa_family == AF_INET6) {
5354                                         sa6 = (struct sockaddr_in6 *)sa;
5355                                         if (SCTP6_ARE_ADDR_EQUAL(
5356                                             sa6, &sin6)) {
5357                                                 fnd = 1;
5358                                                 break;
5359                                         }
5360                                 }
5361 #endif
5362                         }
5363                         if (!fnd) {
5364                                 /* New addr added! no need to look further */
5365                                 return (1);
5366                         }
5367                 }
5368                 offset += SCTP_SIZE32(plen);
5369                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
5370         }
5371         return (0);
5372 }
5373
5374 /*
5375  * Given a MBUF chain that was sent into us containing an INIT. Build a
5376  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
5377  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
5378  * message (i.e. the struct sctp_init_msg).
5379  */
5380 void
5381 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
5382     struct mbuf *init_pkt, int iphlen, int offset,
5383     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
5384     uint8_t use_mflowid, uint32_t mflowid,
5385     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
5386 {
5387         struct sctp_association *asoc;
5388         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
5389         struct sctp_init_ack_chunk *initack;
5390         struct sctp_adaptation_layer_indication *ali;
5391         struct sctp_ecn_supported_param *ecn;
5392         struct sctp_prsctp_supported_param *prsctp;
5393         struct sctp_supported_chunk_types_param *pr_supported;
5394         union sctp_sockstore store, store1, *over_addr;
5395
5396 #ifdef INET
5397         struct sockaddr_in *sin, *to_sin;
5398
5399 #endif
5400 #ifdef INET6
5401         struct sockaddr_in6 *sin6, *to_sin6;
5402
5403 #endif
5404         struct ip *iph;
5405
5406 #ifdef INET6
5407         struct ip6_hdr *ip6;
5408
5409 #endif
5410         struct sockaddr *to;
5411         struct sctp_state_cookie stc;
5412         struct sctp_nets *net = NULL;
5413         uint8_t *signature = NULL;
5414         int cnt_inits_to = 0;
5415         uint16_t his_limit, i_want;
5416         int abort_flag, padval;
5417         int num_ext;
5418         int p_len;
5419         int nat_friendly = 0;
5420         struct socket *so;
5421
5422         if (stcb)
5423                 asoc = &stcb->asoc;
5424         else
5425                 asoc = NULL;
5426         mp_last = NULL;
5427         if ((asoc != NULL) &&
5428             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
5429             (sctp_are_there_new_addresses(asoc, init_pkt, offset))) {
5430                 /* new addresses, out of here in non-cookie-wait states */
5431                 /*
5432                  * Send a ABORT, we don't add the new address error clause
5433                  * though we even set the T bit and copy in the 0 tag.. this
5434                  * looks no different than if no listener was present.
5435                  */
5436                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL,
5437                     use_mflowid, mflowid,
5438                     vrf_id, port);
5439                 return;
5440         }
5441         abort_flag = 0;
5442         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
5443             (offset + sizeof(struct sctp_init_chunk)),
5444             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
5445         if (abort_flag) {
5446 do_a_abort:
5447                 sctp_send_abort(init_pkt, iphlen, sh,
5448                     init_chk->init.initiate_tag, op_err,
5449                     use_mflowid, mflowid,
5450                     vrf_id, port);
5451                 return;
5452         }
5453         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
5454         if (m == NULL) {
5455                 /* No memory, INIT timer will re-attempt. */
5456                 if (op_err)
5457                         sctp_m_freem(op_err);
5458                 return;
5459         }
5460         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_chunk);
5461
5462         /*
5463          * We might not overwrite the identification[] completely and on
5464          * some platforms time_entered will contain some padding. Therefore
5465          * zero out the cookie to avoid putting uninitialized memory on the
5466          * wire.
5467          */
5468         memset(&stc, 0, sizeof(struct sctp_state_cookie));
5469
5470         /* the time I built cookie */
5471         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
5472
5473         /* populate any tie tags */
5474         if (asoc != NULL) {
5475                 /* unlock before tag selections */
5476                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
5477                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
5478                 stc.cookie_life = asoc->cookie_life;
5479                 net = asoc->primary_destination;
5480         } else {
5481                 stc.tie_tag_my_vtag = 0;
5482                 stc.tie_tag_peer_vtag = 0;
5483                 /* life I will award this cookie */
5484                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
5485         }
5486
5487         /* copy in the ports for later check */
5488         stc.myport = sh->dest_port;
5489         stc.peerport = sh->src_port;
5490
5491         /*
5492          * If we wanted to honor cookie life extentions, we would add to
5493          * stc.cookie_life. For now we should NOT honor any extension
5494          */
5495         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
5496         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
5497                 struct inpcb *in_inp;
5498
5499                 /* Its a V6 socket */
5500                 in_inp = (struct inpcb *)inp;
5501                 stc.ipv6_addr_legal = 1;
5502                 /* Now look at the binding flag to see if V4 will be legal */
5503                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
5504                         stc.ipv4_addr_legal = 1;
5505                 } else {
5506                         /* V4 addresses are NOT legal on the association */
5507                         stc.ipv4_addr_legal = 0;
5508                 }
5509         } else {
5510                 /* Its a V4 socket, no - V6 */
5511                 stc.ipv4_addr_legal = 1;
5512                 stc.ipv6_addr_legal = 0;
5513         }
5514
5515 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
5516         stc.ipv4_scope = 1;
5517 #else
5518         stc.ipv4_scope = 0;
5519 #endif
5520         /* now for scope setup */
5521         memset((caddr_t)&store, 0, sizeof(store));
5522         memset((caddr_t)&store1, 0, sizeof(store1));
5523 #ifdef INET
5524         sin = &store.sin;
5525         to_sin = &store1.sin;
5526 #endif
5527 #ifdef INET6
5528         sin6 = &store.sin6;
5529         to_sin6 = &store1.sin6;
5530 #endif
5531         iph = mtod(init_pkt, struct ip *);
5532         /* establish the to_addr's */
5533         switch (iph->ip_v) {
5534 #ifdef INET
5535         case IPVERSION:
5536                 to_sin->sin_port = sh->dest_port;
5537                 to_sin->sin_family = AF_INET;
5538                 to_sin->sin_len = sizeof(struct sockaddr_in);
5539                 to_sin->sin_addr = iph->ip_dst;
5540                 break;
5541 #endif
5542 #ifdef INET6
5543         case IPV6_VERSION >> 4:
5544                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5545                 to_sin6->sin6_addr = ip6->ip6_dst;
5546                 to_sin6->sin6_scope_id = 0;
5547                 to_sin6->sin6_port = sh->dest_port;
5548                 to_sin6->sin6_family = AF_INET6;
5549                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
5550                 break;
5551 #endif
5552         default:
5553                 goto do_a_abort;
5554                 break;
5555         }
5556
5557         if (net == NULL) {
5558                 to = (struct sockaddr *)&store;
5559                 switch (iph->ip_v) {
5560 #ifdef INET
5561                 case IPVERSION:
5562                         {
5563                                 sin->sin_family = AF_INET;
5564                                 sin->sin_len = sizeof(struct sockaddr_in);
5565                                 sin->sin_port = sh->src_port;
5566                                 sin->sin_addr = iph->ip_src;
5567                                 /* lookup address */
5568                                 stc.address[0] = sin->sin_addr.s_addr;
5569                                 stc.address[1] = 0;
5570                                 stc.address[2] = 0;
5571                                 stc.address[3] = 0;
5572                                 stc.addr_type = SCTP_IPV4_ADDRESS;
5573                                 /* local from address */
5574                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
5575                                 stc.laddress[1] = 0;
5576                                 stc.laddress[2] = 0;
5577                                 stc.laddress[3] = 0;
5578                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
5579                                 /* scope_id is only for v6 */
5580                                 stc.scope_id = 0;
5581 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
5582                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
5583                                         stc.ipv4_scope = 1;
5584                                 }
5585 #else
5586                                 stc.ipv4_scope = 1;
5587 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
5588                                 /* Must use the address in this case */
5589                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
5590                                         stc.loopback_scope = 1;
5591                                         stc.ipv4_scope = 1;
5592                                         stc.site_scope = 1;
5593                                         stc.local_scope = 0;
5594                                 }
5595                                 break;
5596                         }
5597 #endif
5598 #ifdef INET6
5599                 case IPV6_VERSION >> 4:
5600                         {
5601                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
5602                                 sin6->sin6_family = AF_INET6;
5603                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
5604                                 sin6->sin6_port = sh->src_port;
5605                                 sin6->sin6_addr = ip6->ip6_src;
5606                                 /* lookup address */
5607                                 memcpy(&stc.address, &sin6->sin6_addr,
5608                                     sizeof(struct in6_addr));
5609                                 sin6->sin6_scope_id = 0;
5610                                 stc.addr_type = SCTP_IPV6_ADDRESS;
5611                                 stc.scope_id = 0;
5612                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
5613                                         /*
5614                                          * FIX ME: does this have scope from
5615                                          * rcvif?
5616                                          */
5617                                         (void)sa6_recoverscope(sin6);
5618                                         stc.scope_id = sin6->sin6_scope_id;
5619                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5620                                         stc.loopback_scope = 1;
5621                                         stc.local_scope = 0;
5622                                         stc.site_scope = 1;
5623                                         stc.ipv4_scope = 1;
5624                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5625                                         /*
5626                                          * If the new destination is a
5627                                          * LINK_LOCAL we must have common
5628                                          * both site and local scope. Don't
5629                                          * set local scope though since we
5630                                          * must depend on the source to be
5631                                          * added implicitly. We cannot
5632                                          * assure just because we share one
5633                                          * link that all links are common.
5634                                          */
5635                                         stc.local_scope = 0;
5636                                         stc.site_scope = 1;
5637                                         stc.ipv4_scope = 1;
5638                                         /*
5639                                          * we start counting for the private
5640                                          * address stuff at 1. since the
5641                                          * link local we source from won't
5642                                          * show up in our scoped count.
5643                                          */
5644                                         cnt_inits_to = 1;
5645                                         /*
5646                                          * pull out the scope_id from
5647                                          * incoming pkt
5648                                          */
5649                                         /*
5650                                          * FIX ME: does this have scope from
5651                                          * rcvif?
5652                                          */
5653                                         (void)sa6_recoverscope(sin6);
5654                                         stc.scope_id = sin6->sin6_scope_id;
5655                                         sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
5656                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
5657                                         /*
5658                                          * If the new destination is
5659                                          * SITE_LOCAL then we must have site
5660                                          * scope in common.
5661                                          */
5662                                         stc.site_scope = 1;
5663                                 }
5664                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
5665                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
5666                                 break;
5667                         }
5668 #endif
5669                 default:
5670                         /* TSNH */
5671                         goto do_a_abort;
5672                         break;
5673                 }
5674         } else {
5675                 /* set the scope per the existing tcb */
5676
5677 #ifdef INET6
5678                 struct sctp_nets *lnet;
5679
5680 #endif
5681
5682                 stc.loopback_scope = asoc->loopback_scope;
5683                 stc.ipv4_scope = asoc->ipv4_local_scope;
5684                 stc.site_scope = asoc->site_scope;
5685                 stc.local_scope = asoc->local_scope;
5686 #ifdef INET6
5687                 /* Why do we not consider IPv4 LL addresses? */
5688                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
5689                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
5690                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
5691                                         /*
5692                                          * if we have a LL address, start
5693                                          * counting at 1.
5694                                          */
5695                                         cnt_inits_to = 1;
5696                                 }
5697                         }
5698                 }
5699 #endif
5700                 /* use the net pointer */
5701                 to = (struct sockaddr *)&net->ro._l_addr;
5702                 switch (to->sa_family) {
5703 #ifdef INET
5704                 case AF_INET:
5705                         sin = (struct sockaddr_in *)to;
5706                         stc.address[0] = sin->sin_addr.s_addr;
5707                         stc.address[1] = 0;
5708                         stc.address[2] = 0;
5709                         stc.address[3] = 0;
5710                         stc.addr_type = SCTP_IPV4_ADDRESS;
5711                         if (net->src_addr_selected == 0) {
5712                                 /*
5713                                  * strange case here, the INIT should have
5714                                  * did the selection.
5715                                  */
5716                                 net->ro._s_addr = sctp_source_address_selection(inp,
5717                                     stcb, (sctp_route_t *) & net->ro,
5718                                     net, 0, vrf_id);
5719                                 if (net->ro._s_addr == NULL)
5720                                         return;
5721
5722                                 net->src_addr_selected = 1;
5723
5724                         }
5725                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
5726                         stc.laddress[1] = 0;
5727                         stc.laddress[2] = 0;
5728                         stc.laddress[3] = 0;
5729                         stc.laddr_type = SCTP_IPV4_ADDRESS;
5730                         /* scope_id is only for v6 */
5731                         stc.scope_id = 0;
5732                         break;
5733 #endif
5734 #ifdef INET6
5735                 case AF_INET6:
5736                         sin6 = (struct sockaddr_in6 *)to;
5737                         memcpy(&stc.address, &sin6->sin6_addr,
5738                             sizeof(struct in6_addr));
5739                         stc.addr_type = SCTP_IPV6_ADDRESS;
5740                         stc.scope_id = sin6->sin6_scope_id;
5741                         if (net->src_addr_selected == 0) {
5742                                 /*
5743                                  * strange case here, the INIT should have
5744                                  * did the selection.
5745                                  */
5746                                 net->ro._s_addr = sctp_source_address_selection(inp,
5747                                     stcb, (sctp_route_t *) & net->ro,
5748                                     net, 0, vrf_id);
5749                                 if (net->ro._s_addr == NULL)
5750                                         return;
5751
5752                                 net->src_addr_selected = 1;
5753                         }
5754                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
5755                             sizeof(struct in6_addr));
5756                         stc.laddr_type = SCTP_IPV6_ADDRESS;
5757                         break;
5758 #endif
5759                 }
5760         }
5761         /* Now lets put the SCTP header in place */
5762         initack = mtod(m, struct sctp_init_ack_chunk *);
5763         /* Save it off for quick ref */
5764         stc.peers_vtag = init_chk->init.initiate_tag;
5765         /* who are we */
5766         memcpy(stc.identification, SCTP_VERSION_STRING,
5767             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
5768         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
5769         /* now the chunk header */
5770         initack->ch.chunk_type = SCTP_INITIATION_ACK;
5771         initack->ch.chunk_flags = 0;
5772         /* fill in later from mbuf we build */
5773         initack->ch.chunk_length = 0;
5774         /* place in my tag */
5775         if ((asoc != NULL) &&
5776             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
5777             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
5778             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
5779                 /* re-use the v-tags and init-seq here */
5780                 initack->init.initiate_tag = htonl(asoc->my_vtag);
5781                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
5782         } else {
5783                 uint32_t vtag, itsn;
5784
5785                 if (hold_inp_lock) {
5786                         SCTP_INP_INCR_REF(inp);
5787                         SCTP_INP_RUNLOCK(inp);
5788                 }
5789                 if (asoc) {
5790                         atomic_add_int(&asoc->refcnt, 1);
5791                         SCTP_TCB_UNLOCK(stcb);
5792         new_tag:
5793                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5794                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
5795                                 /*
5796                                  * Got a duplicate vtag on some guy behind a
5797                                  * nat make sure we don't use it.
5798                                  */
5799                                 goto new_tag;
5800                         }
5801                         initack->init.initiate_tag = htonl(vtag);
5802                         /* get a TSN to use too */
5803                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
5804                         initack->init.initial_tsn = htonl(itsn);
5805                         SCTP_TCB_LOCK(stcb);
5806                         atomic_add_int(&asoc->refcnt, -1);
5807                 } else {
5808                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
5809                         initack->init.initiate_tag = htonl(vtag);
5810                         /* get a TSN to use too */
5811                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
5812                 }
5813                 if (hold_inp_lock) {
5814                         SCTP_INP_RLOCK(inp);
5815                         SCTP_INP_DECR_REF(inp);
5816                 }
5817         }
5818         /* save away my tag to */
5819         stc.my_vtag = initack->init.initiate_tag;
5820
5821         /* set up some of the credits. */
5822         so = inp->sctp_socket;
5823         if (so == NULL) {
5824                 /* memory problem */
5825                 sctp_m_freem(m);
5826                 return;
5827         } else {
5828                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
5829         }
5830         /* set what I want */
5831         his_limit = ntohs(init_chk->init.num_inbound_streams);
5832         /* choose what I want */
5833         if (asoc != NULL) {
5834                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
5835                         i_want = asoc->streamoutcnt;
5836                 } else {
5837                         i_want = inp->sctp_ep.pre_open_stream_count;
5838                 }
5839         } else {
5840                 i_want = inp->sctp_ep.pre_open_stream_count;
5841         }
5842         if (his_limit < i_want) {
5843                 /* I Want more :< */
5844                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
5845         } else {
5846                 /* I can have what I want :> */
5847                 initack->init.num_outbound_streams = htons(i_want);
5848         }
5849         /* tell him his limt. */
5850         initack->init.num_inbound_streams =
5851             htons(inp->sctp_ep.max_open_streams_intome);
5852
5853         /* adaptation layer indication parameter */
5854         ali = (struct sctp_adaptation_layer_indication *)((caddr_t)initack + sizeof(*initack));
5855         ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
5856         ali->ph.param_length = htons(sizeof(*ali));
5857         ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
5858         SCTP_BUF_LEN(m) += sizeof(*ali);
5859         ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali + sizeof(*ali));
5860
5861         /* ECN parameter */
5862         if (((asoc != NULL) && (asoc->ecn_allowed == 1)) ||
5863             (inp->sctp_ecn_enable == 1)) {
5864                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
5865                 ecn->ph.param_length = htons(sizeof(*ecn));
5866                 SCTP_BUF_LEN(m) += sizeof(*ecn);
5867
5868                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
5869                     sizeof(*ecn));
5870         } else {
5871                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
5872         }
5873         /* And now tell the peer we do  pr-sctp */
5874         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
5875         prsctp->ph.param_length = htons(sizeof(*prsctp));
5876         SCTP_BUF_LEN(m) += sizeof(*prsctp);
5877         if (nat_friendly) {
5878                 /* Add NAT friendly parameter */
5879                 struct sctp_paramhdr *ph;
5880
5881                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5882                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
5883                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
5884                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
5885         }
5886         /* And now tell the peer we do all the extensions */
5887         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5888         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
5889         num_ext = 0;
5890         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
5891         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
5892         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
5893         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
5894         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
5895         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
5896                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
5897         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
5898                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
5899         p_len = sizeof(*pr_supported) + num_ext;
5900         pr_supported->ph.param_length = htons(p_len);
5901         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
5902         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5903
5904         /* add authentication parameters */
5905         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
5906                 struct sctp_auth_random *randp;
5907                 struct sctp_auth_hmac_algo *hmacs;
5908                 struct sctp_auth_chunk_list *chunks;
5909                 uint16_t random_len;
5910
5911                 /* generate and add RANDOM parameter */
5912                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
5913                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5914                 randp->ph.param_type = htons(SCTP_RANDOM);
5915                 p_len = sizeof(*randp) + random_len;
5916                 randp->ph.param_length = htons(p_len);
5917                 SCTP_READ_RANDOM(randp->random_data, random_len);
5918                 /* zero out any padding required */
5919                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
5920                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5921
5922                 /* add HMAC_ALGO parameter */
5923                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5924                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
5925                     (uint8_t *) hmacs->hmac_ids);
5926                 if (p_len > 0) {
5927                         p_len += sizeof(*hmacs);
5928                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
5929                         hmacs->ph.param_length = htons(p_len);
5930                         /* zero out any padding required */
5931                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
5932                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5933                 }
5934                 /* add CHUNKS parameter */
5935                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
5936                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
5937                     chunks->chunk_types);
5938                 if (p_len > 0) {
5939                         p_len += sizeof(*chunks);
5940                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
5941                         chunks->ph.param_length = htons(p_len);
5942                         /* zero out any padding required */
5943                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
5944                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
5945                 }
5946         }
5947         m_at = m;
5948         /* now the addresses */
5949         {
5950                 struct sctp_scoping scp;
5951
5952                 /*
5953                  * To optimize this we could put the scoping stuff into a
5954                  * structure and remove the individual uint8's from the stc
5955                  * structure. Then we could just sifa in the address within
5956                  * the stc.. but for now this is a quick hack to get the
5957                  * address stuff teased apart.
5958                  */
5959                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
5960                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
5961                 scp.loopback_scope = stc.loopback_scope;
5962                 scp.ipv4_local_scope = stc.ipv4_scope;
5963                 scp.local_scope = stc.local_scope;
5964                 scp.site_scope = stc.site_scope;
5965                 m_at = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_at, cnt_inits_to);
5966         }
5967
5968         /* tack on the operational error if present */
5969         if (op_err) {
5970                 struct mbuf *ol;
5971                 int llen;
5972
5973                 llen = 0;
5974                 ol = op_err;
5975
5976                 while (ol) {
5977                         llen += SCTP_BUF_LEN(ol);
5978                         ol = SCTP_BUF_NEXT(ol);
5979                 }
5980                 if (llen % 4) {
5981                         /* must add a pad to the param */
5982                         uint32_t cpthis = 0;
5983                         int padlen;
5984
5985                         padlen = 4 - (llen % 4);
5986                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
5987                 }
5988                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5989                         m_at = SCTP_BUF_NEXT(m_at);
5990                 }
5991                 SCTP_BUF_NEXT(m_at) = op_err;
5992                 while (SCTP_BUF_NEXT(m_at) != NULL) {
5993                         m_at = SCTP_BUF_NEXT(m_at);
5994                 }
5995         }
5996         /* pre-calulate the size and update pkt header and chunk header */
5997         p_len = 0;
5998         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
5999                 p_len += SCTP_BUF_LEN(m_tmp);
6000                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6001                         /* m_tmp should now point to last one */
6002                         break;
6003                 }
6004         }
6005
6006         /* Now we must build a cookie */
6007         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
6008         if (m_cookie == NULL) {
6009                 /* memory problem */
6010                 sctp_m_freem(m);
6011                 return;
6012         }
6013         /* Now append the cookie to the end and update the space/size */
6014         SCTP_BUF_NEXT(m_tmp) = m_cookie;
6015
6016         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
6017                 p_len += SCTP_BUF_LEN(m_tmp);
6018                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
6019                         /* m_tmp should now point to last one */
6020                         mp_last = m_tmp;
6021                         break;
6022                 }
6023         }
6024         /*
6025          * Place in the size, but we don't include the last pad (if any) in
6026          * the INIT-ACK.
6027          */
6028         initack->ch.chunk_length = htons(p_len);
6029
6030         /*
6031          * Time to sign the cookie, we don't sign over the cookie signature
6032          * though thus we set trailer.
6033          */
6034         (void)sctp_hmac_m(SCTP_HMAC,
6035             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
6036             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
6037             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
6038         /*
6039          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
6040          * here since the timer will drive a retranmission.
6041          */
6042         padval = p_len % 4;
6043         if ((padval) && (mp_last)) {
6044                 /* see my previous comments on mp_last */
6045                 if (sctp_add_pad_tombuf(mp_last, (4 - padval))) {
6046                         /* Houston we have a problem, no space */
6047                         sctp_m_freem(m);
6048                         return;
6049                 }
6050         }
6051         if (stc.loopback_scope) {
6052                 over_addr = &store1;
6053         } else {
6054                 over_addr = NULL;
6055         }
6056
6057         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
6058             0, 0,
6059             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
6060             port, over_addr,
6061             use_mflowid, mflowid,
6062             SCTP_SO_NOT_LOCKED);
6063         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
6064 }
6065
6066
6067 static void
6068 sctp_prune_prsctp(struct sctp_tcb *stcb,
6069     struct sctp_association *asoc,
6070     struct sctp_sndrcvinfo *srcv,
6071     int dataout)
6072 {
6073         int freed_spc = 0;
6074         struct sctp_tmit_chunk *chk, *nchk;
6075
6076         SCTP_TCB_LOCK_ASSERT(stcb);
6077         if ((asoc->peer_supports_prsctp) &&
6078             (asoc->sent_queue_cnt_removeable > 0)) {
6079                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
6080                         /*
6081                          * Look for chunks marked with the PR_SCTP flag AND
6082                          * the buffer space flag. If the one being sent is
6083                          * equal or greater priority then purge the old one
6084                          * and free some space.
6085                          */
6086                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6087                                 /*
6088                                  * This one is PR-SCTP AND buffer space
6089                                  * limited type
6090                                  */
6091                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6092                                         /*
6093                                          * Lower numbers equates to higher
6094                                          * priority so if the one we are
6095                                          * looking at has a larger or equal
6096                                          * priority we want to drop the data
6097                                          * and NOT retransmit it.
6098                                          */
6099                                         if (chk->data) {
6100                                                 /*
6101                                                  * We release the book_size
6102                                                  * if the mbuf is here
6103                                                  */
6104                                                 int ret_spc;
6105                                                 uint8_t sent;
6106
6107                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
6108                                                         sent = 1;
6109                                                 else
6110                                                         sent = 0;
6111                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6112                                                     sent,
6113                                                     SCTP_SO_LOCKED);
6114                                                 freed_spc += ret_spc;
6115                                                 if (freed_spc >= dataout) {
6116                                                         return;
6117                                                 }
6118                                         }       /* if chunk was present */
6119                                 }       /* if of sufficent priority */
6120                         }       /* if chunk has enabled */
6121                 }               /* tailqforeach */
6122
6123                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
6124                         /* Here we must move to the sent queue and mark */
6125                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
6126                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
6127                                         if (chk->data) {
6128                                                 /*
6129                                                  * We release the book_size
6130                                                  * if the mbuf is here
6131                                                  */
6132                                                 int ret_spc;
6133
6134                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
6135                                                     0, SCTP_SO_LOCKED);
6136
6137                                                 freed_spc += ret_spc;
6138                                                 if (freed_spc >= dataout) {
6139                                                         return;
6140                                                 }
6141                                         }       /* end if chk->data */
6142                                 }       /* end if right class */
6143                         }       /* end if chk pr-sctp */
6144                 }               /* tailqforeachsafe (chk) */
6145         }                       /* if enabled in asoc */
6146 }
6147
6148 int
6149 sctp_get_frag_point(struct sctp_tcb *stcb,
6150     struct sctp_association *asoc)
6151 {
6152         int siz, ovh;
6153
6154         /*
6155          * For endpoints that have both v6 and v4 addresses we must reserve
6156          * room for the ipv6 header, for those that are only dealing with V4
6157          * we use a larger frag point.
6158          */
6159         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
6160                 ovh = SCTP_MED_OVERHEAD;
6161         } else {
6162                 ovh = SCTP_MED_V4_OVERHEAD;
6163         }
6164
6165         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
6166                 siz = asoc->smallest_mtu - ovh;
6167         else
6168                 siz = (stcb->asoc.sctp_frag_point - ovh);
6169         /*
6170          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
6171          */
6172         /* A data chunk MUST fit in a cluster */
6173         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
6174         /* } */
6175
6176         /* adjust for an AUTH chunk if DATA requires auth */
6177         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
6178                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
6179
6180         if (siz % 4) {
6181                 /* make it an even word boundary please */
6182                 siz -= (siz % 4);
6183         }
6184         return (siz);
6185 }
6186
6187 static void
6188 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
6189 {
6190         sp->pr_sctp_on = 0;
6191         /*
6192          * We assume that the user wants PR_SCTP_TTL if the user provides a
6193          * positive lifetime but does not specify any PR_SCTP policy. This
6194          * is a BAD assumption and causes problems at least with the
6195          * U-Vancovers MPI folks. I will change this to be no policy means
6196          * NO PR-SCTP.
6197          */
6198         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
6199                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
6200                 sp->pr_sctp_on = 1;
6201         } else {
6202                 return;
6203         }
6204         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
6205         case CHUNK_FLAGS_PR_SCTP_BUF:
6206                 /*
6207                  * Time to live is a priority stored in tv_sec when doing
6208                  * the buffer drop thing.
6209                  */
6210                 sp->ts.tv_sec = sp->timetolive;
6211                 sp->ts.tv_usec = 0;
6212                 break;
6213         case CHUNK_FLAGS_PR_SCTP_TTL:
6214                 {
6215                         struct timeval tv;
6216
6217                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6218                         tv.tv_sec = sp->timetolive / 1000;
6219                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
6220                         /*
6221                          * TODO sctp_constants.h needs alternative time
6222                          * macros when _KERNEL is undefined.
6223                          */
6224                         timevaladd(&sp->ts, &tv);
6225                 }
6226                 break;
6227         case CHUNK_FLAGS_PR_SCTP_RTX:
6228                 /*
6229                  * Time to live is a the number or retransmissions stored in
6230                  * tv_sec.
6231                  */
6232                 sp->ts.tv_sec = sp->timetolive;
6233                 sp->ts.tv_usec = 0;
6234                 break;
6235         default:
6236                 SCTPDBG(SCTP_DEBUG_USRREQ1,
6237                     "Unknown PR_SCTP policy %u.\n",
6238                     PR_SCTP_POLICY(sp->sinfo_flags));
6239                 break;
6240         }
6241 }
6242
6243 static int
6244 sctp_msg_append(struct sctp_tcb *stcb,
6245     struct sctp_nets *net,
6246     struct mbuf *m,
6247     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
6248 {
6249         int error = 0;
6250         struct mbuf *at;
6251         struct sctp_stream_queue_pending *sp = NULL;
6252         struct sctp_stream_out *strm;
6253
6254         /*
6255          * Given an mbuf chain, put it into the association send queue and
6256          * place it on the wheel
6257          */
6258         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
6259                 /* Invalid stream number */
6260                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6261                 error = EINVAL;
6262                 goto out_now;
6263         }
6264         if ((stcb->asoc.stream_locked) &&
6265             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
6266                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
6267                 error = EINVAL;
6268                 goto out_now;
6269         }
6270         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
6271         /* Now can we send this? */
6272         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
6273             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
6274             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
6275             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
6276                 /* got data while shutting down */
6277                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
6278                 error = ECONNRESET;
6279                 goto out_now;
6280         }
6281         sctp_alloc_a_strmoq(stcb, sp);
6282         if (sp == NULL) {
6283                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6284                 error = ENOMEM;
6285                 goto out_now;
6286         }
6287         sp->sinfo_flags = srcv->sinfo_flags;
6288         sp->timetolive = srcv->sinfo_timetolive;
6289         sp->ppid = srcv->sinfo_ppid;
6290         sp->context = srcv->sinfo_context;
6291         sp->strseq = 0;
6292         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
6293                 sp->net = net;
6294                 atomic_add_int(&sp->net->ref_count, 1);
6295         } else {
6296                 sp->net = NULL;
6297         }
6298         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
6299         sp->stream = srcv->sinfo_stream;
6300         sp->msg_is_complete = 1;
6301         sp->sender_all_done = 1;
6302         sp->some_taken = 0;
6303         sp->data = m;
6304         sp->tail_mbuf = NULL;
6305         sctp_set_prsctp_policy(sp);
6306         /*
6307          * We could in theory (for sendall) sifa the length in, but we would
6308          * still have to hunt through the chain since we need to setup the
6309          * tail_mbuf
6310          */
6311         sp->length = 0;
6312         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
6313                 if (SCTP_BUF_NEXT(at) == NULL)
6314                         sp->tail_mbuf = at;
6315                 sp->length += SCTP_BUF_LEN(at);
6316         }
6317         if (srcv->sinfo_keynumber_valid) {
6318                 sp->auth_keyid = srcv->sinfo_keynumber;
6319         } else {
6320                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
6321         }
6322         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
6323                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
6324                 sp->holds_key_ref = 1;
6325         }
6326         if (hold_stcb_lock == 0) {
6327                 SCTP_TCB_SEND_LOCK(stcb);
6328         }
6329         sctp_snd_sb_alloc(stcb, sp->length);
6330         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
6331         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
6332         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
6333                 sp->strseq = strm->next_sequence_sent;
6334                 strm->next_sequence_sent++;
6335         }
6336         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
6337         m = NULL;
6338         if (hold_stcb_lock == 0) {
6339                 SCTP_TCB_SEND_UNLOCK(stcb);
6340         }
6341 out_now:
6342         if (m) {
6343                 sctp_m_freem(m);
6344         }
6345         return (error);
6346 }
6347
6348
6349 static struct mbuf *
6350 sctp_copy_mbufchain(struct mbuf *clonechain,
6351     struct mbuf *outchain,
6352     struct mbuf **endofchain,
6353     int can_take_mbuf,
6354     int sizeofcpy,
6355     uint8_t copy_by_ref)
6356 {
6357         struct mbuf *m;
6358         struct mbuf *appendchain;
6359         caddr_t cp;
6360         int len;
6361
6362         if (endofchain == NULL) {
6363                 /* error */
6364 error_out:
6365                 if (outchain)
6366                         sctp_m_freem(outchain);
6367                 return (NULL);
6368         }
6369         if (can_take_mbuf) {
6370                 appendchain = clonechain;
6371         } else {
6372                 if (!copy_by_ref &&
6373                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
6374                     ) {
6375                         /* Its not in a cluster */
6376                         if (*endofchain == NULL) {
6377                                 /* lets get a mbuf cluster */
6378                                 if (outchain == NULL) {
6379                                         /* This is the general case */
6380                         new_mbuf:
6381                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6382                                         if (outchain == NULL) {
6383                                                 goto error_out;
6384                                         }
6385                                         SCTP_BUF_LEN(outchain) = 0;
6386                                         *endofchain = outchain;
6387                                         /* get the prepend space */
6388                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
6389                                 } else {
6390                                         /*
6391                                          * We really should not get a NULL
6392                                          * in endofchain
6393                                          */
6394                                         /* find end */
6395                                         m = outchain;
6396                                         while (m) {
6397                                                 if (SCTP_BUF_NEXT(m) == NULL) {
6398                                                         *endofchain = m;
6399                                                         break;
6400                                                 }
6401                                                 m = SCTP_BUF_NEXT(m);
6402                                         }
6403                                         /* sanity */
6404                                         if (*endofchain == NULL) {
6405                                                 /*
6406                                                  * huh, TSNH XXX maybe we
6407                                                  * should panic
6408                                                  */
6409                                                 sctp_m_freem(outchain);
6410                                                 goto new_mbuf;
6411                                         }
6412                                 }
6413                                 /* get the new end of length */
6414                                 len = M_TRAILINGSPACE(*endofchain);
6415                         } else {
6416                                 /* how much is left at the end? */
6417                                 len = M_TRAILINGSPACE(*endofchain);
6418                         }
6419                         /* Find the end of the data, for appending */
6420                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
6421
6422                         /* Now lets copy it out */
6423                         if (len >= sizeofcpy) {
6424                                 /* It all fits, copy it in */
6425                                 m_copydata(clonechain, 0, sizeofcpy, cp);
6426                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6427                         } else {
6428                                 /* fill up the end of the chain */
6429                                 if (len > 0) {
6430                                         m_copydata(clonechain, 0, len, cp);
6431                                         SCTP_BUF_LEN((*endofchain)) += len;
6432                                         /* now we need another one */
6433                                         sizeofcpy -= len;
6434                                 }
6435                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
6436                                 if (m == NULL) {
6437                                         /* We failed */
6438                                         goto error_out;
6439                                 }
6440                                 SCTP_BUF_NEXT((*endofchain)) = m;
6441                                 *endofchain = m;
6442                                 cp = mtod((*endofchain), caddr_t);
6443                                 m_copydata(clonechain, len, sizeofcpy, cp);
6444                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
6445                         }
6446                         return (outchain);
6447                 } else {
6448                         /* copy the old fashion way */
6449                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
6450 #ifdef SCTP_MBUF_LOGGING
6451                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6452                                 struct mbuf *mat;
6453
6454                                 for (mat = appendchain; mat; mat = SCTP_BUF_NEXT(mat)) {
6455                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6456                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6457                                         }
6458                                 }
6459                         }
6460 #endif
6461                 }
6462         }
6463         if (appendchain == NULL) {
6464                 /* error */
6465                 if (outchain)
6466                         sctp_m_freem(outchain);
6467                 return (NULL);
6468         }
6469         if (outchain) {
6470                 /* tack on to the end */
6471                 if (*endofchain != NULL) {
6472                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
6473                 } else {
6474                         m = outchain;
6475                         while (m) {
6476                                 if (SCTP_BUF_NEXT(m) == NULL) {
6477                                         SCTP_BUF_NEXT(m) = appendchain;
6478                                         break;
6479                                 }
6480                                 m = SCTP_BUF_NEXT(m);
6481                         }
6482                 }
6483                 /*
6484                  * save off the end and update the end-chain postion
6485                  */
6486                 m = appendchain;
6487                 while (m) {
6488                         if (SCTP_BUF_NEXT(m) == NULL) {
6489                                 *endofchain = m;
6490                                 break;
6491                         }
6492                         m = SCTP_BUF_NEXT(m);
6493                 }
6494                 return (outchain);
6495         } else {
6496                 /* save off the end and update the end-chain postion */
6497                 m = appendchain;
6498                 while (m) {
6499                         if (SCTP_BUF_NEXT(m) == NULL) {
6500                                 *endofchain = m;
6501                                 break;
6502                         }
6503                         m = SCTP_BUF_NEXT(m);
6504                 }
6505                 return (appendchain);
6506         }
6507 }
6508
6509 int
6510 sctp_med_chunk_output(struct sctp_inpcb *inp,
6511     struct sctp_tcb *stcb,
6512     struct sctp_association *asoc,
6513     int *num_out,
6514     int *reason_code,
6515     int control_only, int from_where,
6516     struct timeval *now, int *now_filled, int frag_point, int so_locked
6517 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6518     SCTP_UNUSED
6519 #endif
6520 );
6521
6522 static void
6523 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
6524     uint32_t val SCTP_UNUSED)
6525 {
6526         struct sctp_copy_all *ca;
6527         struct mbuf *m;
6528         int ret = 0;
6529         int added_control = 0;
6530         int un_sent, do_chunk_output = 1;
6531         struct sctp_association *asoc;
6532         struct sctp_nets *net;
6533
6534         ca = (struct sctp_copy_all *)ptr;
6535         if (ca->m == NULL) {
6536                 return;
6537         }
6538         if (ca->inp != inp) {
6539                 /* TSNH */
6540                 return;
6541         }
6542         if ((ca->m) && ca->sndlen) {
6543                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
6544                 if (m == NULL) {
6545                         /* can't copy so we are done */
6546                         ca->cnt_failed++;
6547                         return;
6548                 }
6549 #ifdef SCTP_MBUF_LOGGING
6550                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6551                         struct mbuf *mat;
6552
6553                         for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6554                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
6555                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
6556                                 }
6557                         }
6558                 }
6559 #endif
6560         } else {
6561                 m = NULL;
6562         }
6563         SCTP_TCB_LOCK_ASSERT(stcb);
6564         if (stcb->asoc.alternate) {
6565                 net = stcb->asoc.alternate;
6566         } else {
6567                 net = stcb->asoc.primary_destination;
6568         }
6569         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
6570                 /* Abort this assoc with m as the user defined reason */
6571                 if (m) {
6572                         struct sctp_paramhdr *ph;
6573
6574                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
6575                         if (m) {
6576                                 ph = mtod(m, struct sctp_paramhdr *);
6577                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
6578                                 ph->param_length = htons(ca->sndlen);
6579                         }
6580                         /*
6581                          * We add one here to keep the assoc from
6582                          * dis-appearing on us.
6583                          */
6584                         atomic_add_int(&stcb->asoc.refcnt, 1);
6585                         sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
6586                         /*
6587                          * sctp_abort_an_association calls sctp_free_asoc()
6588                          * free association will NOT free it since we
6589                          * incremented the refcnt .. we do this to prevent
6590                          * it being freed and things getting tricky since we
6591                          * could end up (from free_asoc) calling inpcb_free
6592                          * which would get a recursive lock call to the
6593                          * iterator lock.. But as a consequence of that the
6594                          * stcb will return to us un-locked.. since
6595                          * free_asoc returns with either no TCB or the TCB
6596                          * unlocked, we must relock.. to unlock in the
6597                          * iterator timer :-0
6598                          */
6599                         SCTP_TCB_LOCK(stcb);
6600                         atomic_add_int(&stcb->asoc.refcnt, -1);
6601                         goto no_chunk_output;
6602                 }
6603         } else {
6604                 if (m) {
6605                         ret = sctp_msg_append(stcb, net, m,
6606                             &ca->sndrcv, 1);
6607                 }
6608                 asoc = &stcb->asoc;
6609                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
6610                         /* shutdown this assoc */
6611                         int cnt;
6612
6613                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
6614
6615                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6616                             TAILQ_EMPTY(&asoc->sent_queue) &&
6617                             (cnt == 0)) {
6618                                 if (asoc->locked_on_sending) {
6619                                         goto abort_anyway;
6620                                 }
6621                                 /*
6622                                  * there is nothing queued to send, so I'm
6623                                  * done...
6624                                  */
6625                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6626                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6627                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6628                                         /*
6629                                          * only send SHUTDOWN the first time
6630                                          * through
6631                                          */
6632                                         sctp_send_shutdown(stcb, net);
6633                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
6634                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
6635                                         }
6636                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
6637                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
6638                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
6639                                             net);
6640                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6641                                             asoc->primary_destination);
6642                                         added_control = 1;
6643                                         do_chunk_output = 0;
6644                                 }
6645                         } else {
6646                                 /*
6647                                  * we still got (or just got) data to send,
6648                                  * so set SHUTDOWN_PENDING
6649                                  */
6650                                 /*
6651                                  * XXX sockets draft says that SCTP_EOF
6652                                  * should be sent with no data.  currently,
6653                                  * we will allow user data to be sent first
6654                                  * and move to SHUTDOWN-PENDING
6655                                  */
6656                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
6657                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
6658                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
6659                                         if (asoc->locked_on_sending) {
6660                                                 /*
6661                                                  * Locked to send out the
6662                                                  * data
6663                                                  */
6664                                                 struct sctp_stream_queue_pending *sp;
6665
6666                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
6667                                                 if (sp) {
6668                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
6669                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
6670                                                 }
6671                                         }
6672                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
6673                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
6674                                             TAILQ_EMPTY(&asoc->sent_queue) &&
6675                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
6676                                 abort_anyway:
6677                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
6678                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
6679                                                     NULL, SCTP_SO_NOT_LOCKED);
6680                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
6681                                                 goto no_chunk_output;
6682                                         }
6683                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
6684                                             asoc->primary_destination);
6685                                 }
6686                         }
6687
6688                 }
6689         }
6690         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
6691             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
6692
6693         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
6694             (stcb->asoc.total_flight > 0) &&
6695             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
6696             ) {
6697                 do_chunk_output = 0;
6698         }
6699         if (do_chunk_output)
6700                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
6701         else if (added_control) {
6702                 int num_out = 0, reason = 0, now_filled = 0;
6703                 struct timeval now;
6704                 int frag_point;
6705
6706                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
6707                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
6708                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
6709         }
6710 no_chunk_output:
6711         if (ret) {
6712                 ca->cnt_failed++;
6713         } else {
6714                 ca->cnt_sent++;
6715         }
6716 }
6717
6718 static void
6719 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
6720 {
6721         struct sctp_copy_all *ca;
6722
6723         ca = (struct sctp_copy_all *)ptr;
6724         /*
6725          * Do a notify here? Kacheong suggests that the notify be done at
6726          * the send time.. so you would push up a notification if any send
6727          * failed. Don't know if this is feasable since the only failures we
6728          * have is "memory" related and if you cannot get an mbuf to send
6729          * the data you surely can't get an mbuf to send up to notify the
6730          * user you can't send the data :->
6731          */
6732
6733         /* now free everything */
6734         sctp_m_freem(ca->m);
6735         SCTP_FREE(ca, SCTP_M_COPYAL);
6736 }
6737
6738
6739 #define MC_ALIGN(m, len) do {                                           \
6740         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
6741 } while (0)
6742
6743
6744
6745 static struct mbuf *
6746 sctp_copy_out_all(struct uio *uio, int len)
6747 {
6748         struct mbuf *ret, *at;
6749         int left, willcpy, cancpy, error;
6750
6751         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
6752         if (ret == NULL) {
6753                 /* TSNH */
6754                 return (NULL);
6755         }
6756         left = len;
6757         SCTP_BUF_LEN(ret) = 0;
6758         /* save space for the data chunk header */
6759         cancpy = M_TRAILINGSPACE(ret);
6760         willcpy = min(cancpy, left);
6761         at = ret;
6762         while (left > 0) {
6763                 /* Align data to the end */
6764                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
6765                 if (error) {
6766         err_out_now:
6767                         sctp_m_freem(at);
6768                         return (NULL);
6769                 }
6770                 SCTP_BUF_LEN(at) = willcpy;
6771                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
6772                 left -= willcpy;
6773                 if (left > 0) {
6774                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
6775                         if (SCTP_BUF_NEXT(at) == NULL) {
6776                                 goto err_out_now;
6777                         }
6778                         at = SCTP_BUF_NEXT(at);
6779                         SCTP_BUF_LEN(at) = 0;
6780                         cancpy = M_TRAILINGSPACE(at);
6781                         willcpy = min(cancpy, left);
6782                 }
6783         }
6784         return (ret);
6785 }
6786
6787 static int
6788 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
6789     struct sctp_sndrcvinfo *srcv)
6790 {
6791         int ret;
6792         struct sctp_copy_all *ca;
6793
6794         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
6795             SCTP_M_COPYAL);
6796         if (ca == NULL) {
6797                 sctp_m_freem(m);
6798                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6799                 return (ENOMEM);
6800         }
6801         memset(ca, 0, sizeof(struct sctp_copy_all));
6802
6803         ca->inp = inp;
6804         if (srcv) {
6805                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
6806         }
6807         /*
6808          * take off the sendall flag, it would be bad if we failed to do
6809          * this :-0
6810          */
6811         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
6812         /* get length and mbuf chain */
6813         if (uio) {
6814                 ca->sndlen = uio->uio_resid;
6815                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
6816                 if (ca->m == NULL) {
6817                         SCTP_FREE(ca, SCTP_M_COPYAL);
6818                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
6819                         return (ENOMEM);
6820                 }
6821         } else {
6822                 /* Gather the length of the send */
6823                 struct mbuf *mat;
6824
6825                 mat = m;
6826                 ca->sndlen = 0;
6827                 while (m) {
6828                         ca->sndlen += SCTP_BUF_LEN(m);
6829                         m = SCTP_BUF_NEXT(m);
6830                 }
6831                 ca->m = mat;
6832         }
6833         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
6834             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
6835             SCTP_ASOC_ANY_STATE,
6836             (void *)ca, 0,
6837             sctp_sendall_completes, inp, 1);
6838         if (ret) {
6839                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
6840                 SCTP_FREE(ca, SCTP_M_COPYAL);
6841                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
6842                 return (EFAULT);
6843         }
6844         return (0);
6845 }
6846
6847
6848 void
6849 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
6850 {
6851         struct sctp_tmit_chunk *chk, *nchk;
6852
6853         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6854                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
6855                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
6856                         if (chk->data) {
6857                                 sctp_m_freem(chk->data);
6858                                 chk->data = NULL;
6859                         }
6860                         asoc->ctrl_queue_cnt--;
6861                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6862                 }
6863         }
6864 }
6865
6866 void
6867 sctp_toss_old_asconf(struct sctp_tcb *stcb)
6868 {
6869         struct sctp_association *asoc;
6870         struct sctp_tmit_chunk *chk, *nchk;
6871         struct sctp_asconf_chunk *acp;
6872
6873         asoc = &stcb->asoc;
6874         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
6875                 /* find SCTP_ASCONF chunk in queue */
6876                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
6877                         if (chk->data) {
6878                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
6879                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
6880                                         /* Not Acked yet */
6881                                         break;
6882                                 }
6883                         }
6884                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
6885                         if (chk->data) {
6886                                 sctp_m_freem(chk->data);
6887                                 chk->data = NULL;
6888                         }
6889                         asoc->ctrl_queue_cnt--;
6890                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
6891                 }
6892         }
6893 }
6894
6895
6896 static void
6897 sctp_clean_up_datalist(struct sctp_tcb *stcb,
6898     struct sctp_association *asoc,
6899     struct sctp_tmit_chunk **data_list,
6900     int bundle_at,
6901     struct sctp_nets *net)
6902 {
6903         int i;
6904         struct sctp_tmit_chunk *tp1;
6905
6906         for (i = 0; i < bundle_at; i++) {
6907                 /* off of the send queue */
6908                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
6909                 asoc->send_queue_cnt--;
6910                 if (i > 0) {
6911                         /*
6912                          * Any chunk NOT 0 you zap the time chunk 0 gets
6913                          * zapped or set based on if a RTO measurment is
6914                          * needed.
6915                          */
6916                         data_list[i]->do_rtt = 0;
6917                 }
6918                 /* record time */
6919                 data_list[i]->sent_rcv_time = net->last_sent_time;
6920                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
6921                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
6922                 if (data_list[i]->whoTo == NULL) {
6923                         data_list[i]->whoTo = net;
6924                         atomic_add_int(&net->ref_count, 1);
6925                 }
6926                 /* on to the sent queue */
6927                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
6928                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6929                         struct sctp_tmit_chunk *tpp;
6930
6931                         /* need to move back */
6932         back_up_more:
6933                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
6934                         if (tpp == NULL) {
6935                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
6936                                 goto all_done;
6937                         }
6938                         tp1 = tpp;
6939                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
6940                                 goto back_up_more;
6941                         }
6942                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
6943                 } else {
6944                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
6945                             data_list[i],
6946                             sctp_next);
6947                 }
6948 all_done:
6949                 /* This does not lower until the cum-ack passes it */
6950                 asoc->sent_queue_cnt++;
6951                 if ((asoc->peers_rwnd <= 0) &&
6952                     (asoc->total_flight == 0) &&
6953                     (bundle_at == 1)) {
6954                         /* Mark the chunk as being a window probe */
6955                         SCTP_STAT_INCR(sctps_windowprobed);
6956                 }
6957 #ifdef SCTP_AUDITING_ENABLED
6958                 sctp_audit_log(0xC2, 3);
6959 #endif
6960                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
6961                 data_list[i]->snd_count = 1;
6962                 data_list[i]->rec.data.chunk_was_revoked = 0;
6963                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
6964                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
6965                             data_list[i]->whoTo->flight_size,
6966                             data_list[i]->book_size,
6967                             (uintptr_t) data_list[i]->whoTo,
6968                             data_list[i]->rec.data.TSN_seq);
6969                 }
6970                 sctp_flight_size_increase(data_list[i]);
6971                 sctp_total_flight_increase(stcb, data_list[i]);
6972                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
6973                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
6974                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
6975                 }
6976                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
6977                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
6978                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
6979                         /* SWS sender side engages */
6980                         asoc->peers_rwnd = 0;
6981                 }
6982         }
6983         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
6984                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
6985         }
6986 }
6987
6988 static void
6989 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
6990 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
6991     SCTP_UNUSED
6992 #endif
6993 )
6994 {
6995         struct sctp_tmit_chunk *chk, *nchk;
6996
6997         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
6998                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
6999                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
7000                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
7001                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
7002                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
7003                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
7004                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
7005                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
7006                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
7007                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
7008                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
7009                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
7010                         /* Stray chunks must be cleaned up */
7011         clean_up_anyway:
7012                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
7013                         if (chk->data) {
7014                                 sctp_m_freem(chk->data);
7015                                 chk->data = NULL;
7016                         }
7017                         asoc->ctrl_queue_cnt--;
7018                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
7019                                 asoc->fwd_tsn_cnt--;
7020                         sctp_free_a_chunk(stcb, chk, so_locked);
7021                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
7022                         /* special handling, we must look into the param */
7023                         if (chk != asoc->str_reset) {
7024                                 goto clean_up_anyway;
7025                         }
7026                 }
7027         }
7028 }
7029
7030
7031 static int
7032 sctp_can_we_split_this(struct sctp_tcb *stcb,
7033     uint32_t length,
7034     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
7035 {
7036         /*
7037          * Make a decision on if I should split a msg into multiple parts.
7038          * This is only asked of incomplete messages.
7039          */
7040         if (eeor_on) {
7041                 /*
7042                  * If we are doing EEOR we need to always send it if its the
7043                  * entire thing, since it might be all the guy is putting in
7044                  * the hopper.
7045                  */
7046                 if (goal_mtu >= length) {
7047                         /*-
7048                          * If we have data outstanding,
7049                          * we get another chance when the sack
7050                          * arrives to transmit - wait for more data
7051                          */
7052                         if (stcb->asoc.total_flight == 0) {
7053                                 /*
7054                                  * If nothing is in flight, we zero the
7055                                  * packet counter.
7056                                  */
7057                                 return (length);
7058                         }
7059                         return (0);
7060
7061                 } else {
7062                         /* You can fill the rest */
7063                         return (goal_mtu);
7064                 }
7065         }
7066         /*-
7067          * For those strange folk that make the send buffer
7068          * smaller than our fragmentation point, we can't
7069          * get a full msg in so we have to allow splitting.
7070          */
7071         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
7072                 return (length);
7073         }
7074         if ((length <= goal_mtu) ||
7075             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
7076                 /* Sub-optimial residual don't split in non-eeor mode. */
7077                 return (0);
7078         }
7079         /*
7080          * If we reach here length is larger than the goal_mtu. Do we wish
7081          * to split it for the sake of packet putting together?
7082          */
7083         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
7084                 /* Its ok to split it */
7085                 return (min(goal_mtu, frag_point));
7086         }
7087         /* Nope, can't split */
7088         return (0);
7089
7090 }
7091
7092 static uint32_t
7093 sctp_move_to_outqueue(struct sctp_tcb *stcb,
7094     struct sctp_stream_out *strq,
7095     uint32_t goal_mtu,
7096     uint32_t frag_point,
7097     int *locked,
7098     int *giveup,
7099     int eeor_mode,
7100     int *bail,
7101     int so_locked
7102 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7103     SCTP_UNUSED
7104 #endif
7105 )
7106 {
7107         /* Move from the stream to the send_queue keeping track of the total */
7108         struct sctp_association *asoc;
7109         struct sctp_stream_queue_pending *sp;
7110         struct sctp_tmit_chunk *chk;
7111         struct sctp_data_chunk *dchkh;
7112         uint32_t to_move, length;
7113         uint8_t rcv_flags = 0;
7114         uint8_t some_taken;
7115         uint8_t send_lock_up = 0;
7116
7117         SCTP_TCB_LOCK_ASSERT(stcb);
7118         asoc = &stcb->asoc;
7119 one_more_time:
7120         /* sa_ignore FREED_MEMORY */
7121         sp = TAILQ_FIRST(&strq->outqueue);
7122         if (sp == NULL) {
7123                 *locked = 0;
7124                 if (send_lock_up == 0) {
7125                         SCTP_TCB_SEND_LOCK(stcb);
7126                         send_lock_up = 1;
7127                 }
7128                 sp = TAILQ_FIRST(&strq->outqueue);
7129                 if (sp) {
7130                         goto one_more_time;
7131                 }
7132                 if (strq->last_msg_incomplete) {
7133                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
7134                             strq->stream_no,
7135                             strq->last_msg_incomplete);
7136                         strq->last_msg_incomplete = 0;
7137                 }
7138                 to_move = 0;
7139                 if (send_lock_up) {
7140                         SCTP_TCB_SEND_UNLOCK(stcb);
7141                         send_lock_up = 0;
7142                 }
7143                 goto out_of;
7144         }
7145         if ((sp->msg_is_complete) && (sp->length == 0)) {
7146                 if (sp->sender_all_done) {
7147                         /*
7148                          * We are doing differed cleanup. Last time through
7149                          * when we took all the data the sender_all_done was
7150                          * not set.
7151                          */
7152                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
7153                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
7154                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7155                                     sp->sender_all_done,
7156                                     sp->length,
7157                                     sp->msg_is_complete,
7158                                     sp->put_last_out,
7159                                     send_lock_up);
7160                         }
7161                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
7162                                 SCTP_TCB_SEND_LOCK(stcb);
7163                                 send_lock_up = 1;
7164                         }
7165                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7166                         TAILQ_REMOVE(&strq->outqueue, sp, next);
7167                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7168                         if (sp->net) {
7169                                 sctp_free_remote_addr(sp->net);
7170                                 sp->net = NULL;
7171                         }
7172                         if (sp->data) {
7173                                 sctp_m_freem(sp->data);
7174                                 sp->data = NULL;
7175                         }
7176                         sctp_free_a_strmoq(stcb, sp, so_locked);
7177                         /* we can't be locked to it */
7178                         *locked = 0;
7179                         stcb->asoc.locked_on_sending = NULL;
7180                         if (send_lock_up) {
7181                                 SCTP_TCB_SEND_UNLOCK(stcb);
7182                                 send_lock_up = 0;
7183                         }
7184                         /* back to get the next msg */
7185                         goto one_more_time;
7186                 } else {
7187                         /*
7188                          * sender just finished this but still holds a
7189                          * reference
7190                          */
7191                         *locked = 1;
7192                         *giveup = 1;
7193                         to_move = 0;
7194                         goto out_of;
7195                 }
7196         } else {
7197                 /* is there some to get */
7198                 if (sp->length == 0) {
7199                         /* no */
7200                         *locked = 1;
7201                         *giveup = 1;
7202                         to_move = 0;
7203                         goto out_of;
7204                 } else if (sp->discard_rest) {
7205                         if (send_lock_up == 0) {
7206                                 SCTP_TCB_SEND_LOCK(stcb);
7207                                 send_lock_up = 1;
7208                         }
7209                         /* Whack down the size */
7210                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
7211                         if ((stcb->sctp_socket != NULL) && \
7212                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
7213                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
7214                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
7215                         }
7216                         if (sp->data) {
7217                                 sctp_m_freem(sp->data);
7218                                 sp->data = NULL;
7219                                 sp->tail_mbuf = NULL;
7220                         }
7221                         sp->length = 0;
7222                         sp->some_taken = 1;
7223                         *locked = 1;
7224                         *giveup = 1;
7225                         to_move = 0;
7226                         goto out_of;
7227                 }
7228         }
7229         some_taken = sp->some_taken;
7230         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
7231                 sp->msg_is_complete = 1;
7232         }
7233 re_look:
7234         length = sp->length;
7235         if (sp->msg_is_complete) {
7236                 /* The message is complete */
7237                 to_move = min(length, frag_point);
7238                 if (to_move == length) {
7239                         /* All of it fits in the MTU */
7240                         if (sp->some_taken) {
7241                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
7242                                 sp->put_last_out = 1;
7243                         } else {
7244                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
7245                                 sp->put_last_out = 1;
7246                         }
7247                 } else {
7248                         /* Not all of it fits, we fragment */
7249                         if (sp->some_taken == 0) {
7250                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7251                         }
7252                         sp->some_taken = 1;
7253                 }
7254         } else {
7255                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
7256                 if (to_move) {
7257                         /*-
7258                          * We use a snapshot of length in case it
7259                          * is expanding during the compare.
7260                          */
7261                         uint32_t llen;
7262
7263                         llen = length;
7264                         if (to_move >= llen) {
7265                                 to_move = llen;
7266                                 if (send_lock_up == 0) {
7267                                         /*-
7268                                          * We are taking all of an incomplete msg
7269                                          * thus we need a send lock.
7270                                          */
7271                                         SCTP_TCB_SEND_LOCK(stcb);
7272                                         send_lock_up = 1;
7273                                         if (sp->msg_is_complete) {
7274                                                 /*
7275                                                  * the sender finished the
7276                                                  * msg
7277                                                  */
7278                                                 goto re_look;
7279                                         }
7280                                 }
7281                         }
7282                         if (sp->some_taken == 0) {
7283                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
7284                                 sp->some_taken = 1;
7285                         }
7286                 } else {
7287                         /* Nothing to take. */
7288                         if (sp->some_taken) {
7289                                 *locked = 1;
7290                         }
7291                         *giveup = 1;
7292                         to_move = 0;
7293                         goto out_of;
7294                 }
7295         }
7296
7297         /* If we reach here, we can copy out a chunk */
7298         sctp_alloc_a_chunk(stcb, chk);
7299         if (chk == NULL) {
7300                 /* No chunk memory */
7301                 *giveup = 1;
7302                 to_move = 0;
7303                 goto out_of;
7304         }
7305         /*
7306          * Setup for unordered if needed by looking at the user sent info
7307          * flags.
7308          */
7309         if (sp->sinfo_flags & SCTP_UNORDERED) {
7310                 rcv_flags |= SCTP_DATA_UNORDERED;
7311         }
7312         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
7313             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
7314                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
7315         }
7316         /* clear out the chunk before setting up */
7317         memset(chk, 0, sizeof(*chk));
7318         chk->rec.data.rcv_flags = rcv_flags;
7319
7320         if (to_move >= length) {
7321                 /* we think we can steal the whole thing */
7322                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
7323                         SCTP_TCB_SEND_LOCK(stcb);
7324                         send_lock_up = 1;
7325                 }
7326                 if (to_move < sp->length) {
7327                         /* bail, it changed */
7328                         goto dont_do_it;
7329                 }
7330                 chk->data = sp->data;
7331                 chk->last_mbuf = sp->tail_mbuf;
7332                 /* register the stealing */
7333                 sp->data = sp->tail_mbuf = NULL;
7334         } else {
7335                 struct mbuf *m;
7336
7337 dont_do_it:
7338                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
7339                 chk->last_mbuf = NULL;
7340                 if (chk->data == NULL) {
7341                         sp->some_taken = some_taken;
7342                         sctp_free_a_chunk(stcb, chk, so_locked);
7343                         *bail = 1;
7344                         to_move = 0;
7345                         goto out_of;
7346                 }
7347 #ifdef SCTP_MBUF_LOGGING
7348                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
7349                         struct mbuf *mat;
7350
7351                         for (mat = chk->data; mat; mat = SCTP_BUF_NEXT(mat)) {
7352                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
7353                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
7354                                 }
7355                         }
7356                 }
7357 #endif
7358                 /* Pull off the data */
7359                 m_adj(sp->data, to_move);
7360                 /* Now lets work our way down and compact it */
7361                 m = sp->data;
7362                 while (m && (SCTP_BUF_LEN(m) == 0)) {
7363                         sp->data = SCTP_BUF_NEXT(m);
7364                         SCTP_BUF_NEXT(m) = NULL;
7365                         if (sp->tail_mbuf == m) {
7366                                 /*-
7367                                  * Freeing tail? TSNH since
7368                                  * we supposedly were taking less
7369                                  * than the sp->length.
7370                                  */
7371 #ifdef INVARIANTS
7372                                 panic("Huh, freing tail? - TSNH");
7373 #else
7374                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
7375                                 sp->tail_mbuf = sp->data = NULL;
7376                                 sp->length = 0;
7377 #endif
7378
7379                         }
7380                         sctp_m_free(m);
7381                         m = sp->data;
7382                 }
7383         }
7384         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
7385                 chk->copy_by_ref = 1;
7386         } else {
7387                 chk->copy_by_ref = 0;
7388         }
7389         /*
7390          * get last_mbuf and counts of mb useage This is ugly but hopefully
7391          * its only one mbuf.
7392          */
7393         if (chk->last_mbuf == NULL) {
7394                 chk->last_mbuf = chk->data;
7395                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
7396                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
7397                 }
7398         }
7399         if (to_move > length) {
7400                 /*- This should not happen either
7401                  * since we always lower to_move to the size
7402                  * of sp->length if its larger.
7403                  */
7404 #ifdef INVARIANTS
7405                 panic("Huh, how can to_move be larger?");
7406 #else
7407                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
7408                 sp->length = 0;
7409 #endif
7410         } else {
7411                 atomic_subtract_int(&sp->length, to_move);
7412         }
7413         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
7414                 /* Not enough room for a chunk header, get some */
7415                 struct mbuf *m;
7416
7417                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
7418                 if (m == NULL) {
7419                         /*
7420                          * we're in trouble here. _PREPEND below will free
7421                          * all the data if there is no leading space, so we
7422                          * must put the data back and restore.
7423                          */
7424                         if (send_lock_up == 0) {
7425                                 SCTP_TCB_SEND_LOCK(stcb);
7426                                 send_lock_up = 1;
7427                         }
7428                         if (chk->data == NULL) {
7429                                 /* unsteal the data */
7430                                 sp->data = chk->data;
7431                                 sp->tail_mbuf = chk->last_mbuf;
7432                         } else {
7433                                 struct mbuf *m_tmp;
7434
7435                                 /* reassemble the data */
7436                                 m_tmp = sp->data;
7437                                 sp->data = chk->data;
7438                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
7439                         }
7440                         sp->some_taken = some_taken;
7441                         atomic_add_int(&sp->length, to_move);
7442                         chk->data = NULL;
7443                         *bail = 1;
7444                         sctp_free_a_chunk(stcb, chk, so_locked);
7445                         to_move = 0;
7446                         goto out_of;
7447                 } else {
7448                         SCTP_BUF_LEN(m) = 0;
7449                         SCTP_BUF_NEXT(m) = chk->data;
7450                         chk->data = m;
7451                         M_ALIGN(chk->data, 4);
7452                 }
7453         }
7454         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
7455         if (chk->data == NULL) {
7456                 /* HELP, TSNH since we assured it would not above? */
7457 #ifdef INVARIANTS
7458                 panic("prepend failes HELP?");
7459 #else
7460                 SCTP_PRINTF("prepend fails HELP?\n");
7461                 sctp_free_a_chunk(stcb, chk, so_locked);
7462 #endif
7463                 *bail = 1;
7464                 to_move = 0;
7465                 goto out_of;
7466         }
7467         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
7468         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
7469         chk->book_size_scale = 0;
7470         chk->sent = SCTP_DATAGRAM_UNSENT;
7471
7472         chk->flags = 0;
7473         chk->asoc = &stcb->asoc;
7474         chk->pad_inplace = 0;
7475         chk->no_fr_allowed = 0;
7476         chk->rec.data.stream_seq = sp->strseq;
7477         chk->rec.data.stream_number = sp->stream;
7478         chk->rec.data.payloadtype = sp->ppid;
7479         chk->rec.data.context = sp->context;
7480         chk->rec.data.doing_fast_retransmit = 0;
7481
7482         chk->rec.data.timetodrop = sp->ts;
7483         chk->flags = sp->act_flags;
7484
7485         if (sp->net) {
7486                 chk->whoTo = sp->net;
7487                 atomic_add_int(&chk->whoTo->ref_count, 1);
7488         } else
7489                 chk->whoTo = NULL;
7490
7491         if (sp->holds_key_ref) {
7492                 chk->auth_keyid = sp->auth_keyid;
7493                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
7494                 chk->holds_key_ref = 1;
7495         }
7496         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
7497         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
7498                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
7499                     (uintptr_t) stcb, sp->length,
7500                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
7501                     chk->rec.data.TSN_seq);
7502         }
7503         dchkh = mtod(chk->data, struct sctp_data_chunk *);
7504         /*
7505          * Put the rest of the things in place now. Size was done earlier in
7506          * previous loop prior to padding.
7507          */
7508
7509 #ifdef SCTP_ASOCLOG_OF_TSNS
7510         SCTP_TCB_LOCK_ASSERT(stcb);
7511         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
7512                 asoc->tsn_out_at = 0;
7513                 asoc->tsn_out_wrapped = 1;
7514         }
7515         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
7516         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
7517         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
7518         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
7519         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
7520         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
7521         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
7522         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
7523         asoc->tsn_out_at++;
7524 #endif
7525
7526         dchkh->ch.chunk_type = SCTP_DATA;
7527         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
7528         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
7529         dchkh->dp.stream_id = htons(strq->stream_no);
7530         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
7531         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
7532         dchkh->ch.chunk_length = htons(chk->send_size);
7533         /* Now advance the chk->send_size by the actual pad needed. */
7534         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
7535                 /* need a pad */
7536                 struct mbuf *lm;
7537                 int pads;
7538
7539                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
7540                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
7541                         chk->pad_inplace = 1;
7542                 }
7543                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
7544                         /* pad added an mbuf */
7545                         chk->last_mbuf = lm;
7546                 }
7547                 chk->send_size += pads;
7548         }
7549         /* We only re-set the policy if it is on */
7550         if (sp->pr_sctp_on) {
7551                 sctp_set_prsctp_policy(sp);
7552                 asoc->pr_sctp_cnt++;
7553                 chk->pr_sctp_on = 1;
7554         } else {
7555                 chk->pr_sctp_on = 0;
7556         }
7557         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
7558                 /* All done pull and kill the message */
7559                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
7560                 if (sp->put_last_out == 0) {
7561                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
7562                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
7563                             sp->sender_all_done,
7564                             sp->length,
7565                             sp->msg_is_complete,
7566                             sp->put_last_out,
7567                             send_lock_up);
7568                 }
7569                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
7570                         SCTP_TCB_SEND_LOCK(stcb);
7571                         send_lock_up = 1;
7572                 }
7573                 TAILQ_REMOVE(&strq->outqueue, sp, next);
7574                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
7575                 if (sp->net) {
7576                         sctp_free_remote_addr(sp->net);
7577                         sp->net = NULL;
7578                 }
7579                 if (sp->data) {
7580                         sctp_m_freem(sp->data);
7581                         sp->data = NULL;
7582                 }
7583                 sctp_free_a_strmoq(stcb, sp, so_locked);
7584
7585                 /* we can't be locked to it */
7586                 *locked = 0;
7587                 stcb->asoc.locked_on_sending = NULL;
7588         } else {
7589                 /* more to go, we are locked */
7590                 *locked = 1;
7591         }
7592         asoc->chunks_on_out_queue++;
7593         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
7594         asoc->send_queue_cnt++;
7595 out_of:
7596         if (send_lock_up) {
7597                 SCTP_TCB_SEND_UNLOCK(stcb);
7598         }
7599         return (to_move);
7600 }
7601
7602
7603 static void
7604 sctp_fill_outqueue(struct sctp_tcb *stcb,
7605     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
7606 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7607     SCTP_UNUSED
7608 #endif
7609 )
7610 {
7611         struct sctp_association *asoc;
7612         struct sctp_stream_out *strq;
7613         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
7614         int locked, giveup;
7615
7616         SCTP_TCB_LOCK_ASSERT(stcb);
7617         asoc = &stcb->asoc;
7618         switch (net->ro._l_addr.sa.sa_family) {
7619 #ifdef INET
7620         case AF_INET:
7621                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
7622                 break;
7623 #endif
7624 #ifdef INET6
7625         case AF_INET6:
7626                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
7627                 break;
7628 #endif
7629         default:
7630                 /* TSNH */
7631                 goal_mtu = net->mtu;
7632                 break;
7633         }
7634         /* Need an allowance for the data chunk header too */
7635         goal_mtu -= sizeof(struct sctp_data_chunk);
7636
7637         /* must make even word boundary */
7638         goal_mtu &= 0xfffffffc;
7639         if (asoc->locked_on_sending) {
7640                 /* We are stuck on one stream until the message completes. */
7641                 strq = asoc->locked_on_sending;
7642                 locked = 1;
7643         } else {
7644                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7645                 locked = 0;
7646         }
7647         while ((goal_mtu > 0) && strq) {
7648                 giveup = 0;
7649                 bail = 0;
7650                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
7651                     &giveup, eeor_mode, &bail, so_locked);
7652                 if (moved_how_much)
7653                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
7654
7655                 if (locked) {
7656                         asoc->locked_on_sending = strq;
7657                         if ((moved_how_much == 0) || (giveup) || bail)
7658                                 /* no more to move for now */
7659                                 break;
7660                 } else {
7661                         asoc->locked_on_sending = NULL;
7662                         if ((giveup) || bail) {
7663                                 break;
7664                         }
7665                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
7666                         if (strq == NULL) {
7667                                 break;
7668                         }
7669                 }
7670                 total_moved += moved_how_much;
7671                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
7672                 goal_mtu &= 0xfffffffc;
7673         }
7674         if (bail)
7675                 *quit_now = 1;
7676
7677         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
7678
7679         if (total_moved == 0) {
7680                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
7681                     (net == stcb->asoc.primary_destination)) {
7682                         /* ran dry for primary network net */
7683                         SCTP_STAT_INCR(sctps_primary_randry);
7684                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
7685                         /* ran dry with CMT on */
7686                         SCTP_STAT_INCR(sctps_cmt_randry);
7687                 }
7688         }
7689 }
7690
7691 void
7692 sctp_fix_ecn_echo(struct sctp_association *asoc)
7693 {
7694         struct sctp_tmit_chunk *chk;
7695
7696         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7697                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
7698                         chk->sent = SCTP_DATAGRAM_UNSENT;
7699                 }
7700         }
7701 }
7702
7703 void
7704 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
7705 {
7706         struct sctp_association *asoc;
7707         struct sctp_tmit_chunk *chk;
7708         struct sctp_stream_queue_pending *sp;
7709         unsigned int i;
7710
7711         if (net == NULL) {
7712                 return;
7713         }
7714         asoc = &stcb->asoc;
7715         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
7716                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
7717                         if (sp->net == net) {
7718                                 sctp_free_remote_addr(sp->net);
7719                                 sp->net = NULL;
7720                         }
7721                 }
7722         }
7723         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7724                 if (chk->whoTo == net) {
7725                         sctp_free_remote_addr(chk->whoTo);
7726                         chk->whoTo = NULL;
7727                 }
7728         }
7729 }
7730
7731 int
7732 sctp_med_chunk_output(struct sctp_inpcb *inp,
7733     struct sctp_tcb *stcb,
7734     struct sctp_association *asoc,
7735     int *num_out,
7736     int *reason_code,
7737     int control_only, int from_where,
7738     struct timeval *now, int *now_filled, int frag_point, int so_locked
7739 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
7740     SCTP_UNUSED
7741 #endif
7742 )
7743 {
7744         /*
7745          * Ok this is the generic chunk service queue. we must do the
7746          * following: - Service the stream queue that is next, moving any
7747          * message (note I must get a complete message i.e. FIRST/MIDDLE and
7748          * LAST to the out queue in one pass) and assigning TSN's - Check to
7749          * see if the cwnd/rwnd allows any output, if so we go ahead and
7750          * fomulate and send the low level chunks. Making sure to combine
7751          * any control in the control chunk queue also.
7752          */
7753         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
7754         struct mbuf *outchain, *endoutchain;
7755         struct sctp_tmit_chunk *chk, *nchk;
7756
7757         /* temp arrays for unlinking */
7758         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
7759         int no_fragmentflg, error;
7760         unsigned int max_rwnd_per_dest, max_send_per_dest;
7761         int one_chunk, hbflag, skip_data_for_this_net;
7762         int asconf, cookie, no_out_cnt;
7763         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
7764         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
7765         int tsns_sent = 0;
7766         uint32_t auth_offset = 0;
7767         struct sctp_auth_chunk *auth = NULL;
7768         uint16_t auth_keyid;
7769         int override_ok = 1;
7770         int skip_fill_up = 0;
7771         int data_auth_reqd = 0;
7772
7773         /*
7774          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
7775          * destination.
7776          */
7777         int quit_now = 0;
7778
7779         *num_out = 0;
7780         auth_keyid = stcb->asoc.authinfo.active_keyid;
7781
7782         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
7783             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
7784             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
7785                 eeor_mode = 1;
7786         } else {
7787                 eeor_mode = 0;
7788         }
7789         ctl_cnt = no_out_cnt = asconf = cookie = 0;
7790         /*
7791          * First lets prime the pump. For each destination, if there is room
7792          * in the flight size, attempt to pull an MTU's worth out of the
7793          * stream queues into the general send_queue
7794          */
7795 #ifdef SCTP_AUDITING_ENABLED
7796         sctp_audit_log(0xC2, 2);
7797 #endif
7798         SCTP_TCB_LOCK_ASSERT(stcb);
7799         hbflag = 0;
7800         if ((control_only) || (asoc->stream_reset_outstanding))
7801                 no_data_chunks = 1;
7802         else
7803                 no_data_chunks = 0;
7804
7805         /* Nothing to possible to send? */
7806         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
7807             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
7808             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7809             TAILQ_EMPTY(&asoc->send_queue) &&
7810             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
7811 nothing_to_send:
7812                 *reason_code = 9;
7813                 return (0);
7814         }
7815         if (asoc->peers_rwnd == 0) {
7816                 /* No room in peers rwnd */
7817                 *reason_code = 1;
7818                 if (asoc->total_flight > 0) {
7819                         /* we are allowed one chunk in flight */
7820                         no_data_chunks = 1;
7821                 }
7822         }
7823         if (stcb->asoc.ecn_echo_cnt_onq) {
7824                 /* Record where a sack goes, if any */
7825                 if (no_data_chunks &&
7826                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
7827                         /* Nothing but ECNe to send - we don't do that */
7828                         goto nothing_to_send;
7829                 }
7830                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7831                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
7832                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
7833                                 sack_goes_to = chk->whoTo;
7834                                 break;
7835                         }
7836                 }
7837         }
7838         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
7839         if (stcb->sctp_socket)
7840                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
7841         else
7842                 max_send_per_dest = 0;
7843         if (no_data_chunks == 0) {
7844                 /* How many non-directed chunks are there? */
7845                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
7846                         if (chk->whoTo == NULL) {
7847                                 /*
7848                                  * We already have non-directed chunks on
7849                                  * the queue, no need to do a fill-up.
7850                                  */
7851                                 skip_fill_up = 1;
7852                                 break;
7853                         }
7854                 }
7855
7856         }
7857         if ((no_data_chunks == 0) &&
7858             (skip_fill_up == 0) &&
7859             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
7860                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
7861                         /*
7862                          * This for loop we are in takes in each net, if
7863                          * its's got space in cwnd and has data sent to it
7864                          * (when CMT is off) then it calls
7865                          * sctp_fill_outqueue for the net. This gets data on
7866                          * the send queue for that network.
7867                          *
7868                          * In sctp_fill_outqueue TSN's are assigned and data is
7869                          * copied out of the stream buffers. Note mostly
7870                          * copy by reference (we hope).
7871                          */
7872                         net->window_probe = 0;
7873                         if ((net != stcb->asoc.alternate) &&
7874                             ((net->dest_state & SCTP_ADDR_PF) ||
7875                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
7876                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
7877                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7878                                         sctp_log_cwnd(stcb, net, 1,
7879                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7880                                 }
7881                                 continue;
7882                         }
7883                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
7884                             (net->flight_size == 0)) {
7885                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
7886                         }
7887                         if (net->flight_size >= net->cwnd) {
7888                                 /* skip this network, no room - can't fill */
7889                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7890                                         sctp_log_cwnd(stcb, net, 3,
7891                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7892                                 }
7893                                 continue;
7894                         }
7895                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
7896                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
7897                         }
7898                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
7899                         if (quit_now) {
7900                                 /* memory alloc failure */
7901                                 no_data_chunks = 1;
7902                                 break;
7903                         }
7904                 }
7905         }
7906         /* now service each destination and send out what we can for it */
7907         /* Nothing to send? */
7908         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7909             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7910             TAILQ_EMPTY(&asoc->send_queue)) {
7911                 *reason_code = 8;
7912                 return (0);
7913         }
7914         if (asoc->sctp_cmt_on_off > 0) {
7915                 /* get the last start point */
7916                 start_at = asoc->last_net_cmt_send_started;
7917                 if (start_at == NULL) {
7918                         /* null so to beginning */
7919                         start_at = TAILQ_FIRST(&asoc->nets);
7920                 } else {
7921                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
7922                         if (start_at == NULL) {
7923                                 start_at = TAILQ_FIRST(&asoc->nets);
7924                         }
7925                 }
7926                 asoc->last_net_cmt_send_started = start_at;
7927         } else {
7928                 start_at = TAILQ_FIRST(&asoc->nets);
7929         }
7930         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
7931                 if (chk->whoTo == NULL) {
7932                         if (asoc->alternate) {
7933                                 chk->whoTo = asoc->alternate;
7934                         } else {
7935                                 chk->whoTo = asoc->primary_destination;
7936                         }
7937                         atomic_add_int(&chk->whoTo->ref_count, 1);
7938                 }
7939         }
7940         old_start_at = NULL;
7941 again_one_more_time:
7942         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
7943                 /* how much can we send? */
7944                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
7945                 if (old_start_at && (old_start_at == net)) {
7946                         /* through list ocmpletely. */
7947                         break;
7948                 }
7949                 tsns_sent = 0xa;
7950                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
7951                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
7952                     (net->flight_size >= net->cwnd)) {
7953                         /*
7954                          * Nothing on control or asconf and flight is full,
7955                          * we can skip even in the CMT case.
7956                          */
7957                         continue;
7958                 }
7959                 bundle_at = 0;
7960                 endoutchain = outchain = NULL;
7961                 no_fragmentflg = 1;
7962                 one_chunk = 0;
7963                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
7964                         skip_data_for_this_net = 1;
7965                 } else {
7966                         skip_data_for_this_net = 0;
7967                 }
7968                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
7969                         /*
7970                          * if we have a route and an ifp check to see if we
7971                          * have room to send to this guy
7972                          */
7973                         struct ifnet *ifp;
7974
7975                         ifp = net->ro.ro_rt->rt_ifp;
7976                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
7977                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
7978                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
7979                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
7980                                 }
7981                                 continue;
7982                         }
7983                 }
7984                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
7985 #ifdef INET
7986                 case AF_INET:
7987                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
7988                         break;
7989 #endif
7990 #ifdef INET6
7991                 case AF_INET6:
7992                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
7993                         break;
7994 #endif
7995                 default:
7996                         /* TSNH */
7997                         mtu = net->mtu;
7998                         break;
7999                 }
8000                 mx_mtu = mtu;
8001                 to_out = 0;
8002                 if (mtu > asoc->peers_rwnd) {
8003                         if (asoc->total_flight > 0) {
8004                                 /* We have a packet in flight somewhere */
8005                                 r_mtu = asoc->peers_rwnd;
8006                         } else {
8007                                 /* We are always allowed to send one MTU out */
8008                                 one_chunk = 1;
8009                                 r_mtu = mtu;
8010                         }
8011                 } else {
8012                         r_mtu = mtu;
8013                 }
8014                 /************************/
8015                 /* ASCONF transmission */
8016                 /************************/
8017                 /* Now first lets go through the asconf queue */
8018                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
8019                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
8020                                 continue;
8021                         }
8022                         if (chk->whoTo == NULL) {
8023                                 if (asoc->alternate == NULL) {
8024                                         if (asoc->primary_destination != net) {
8025                                                 break;
8026                                         }
8027                                 } else {
8028                                         if (asoc->alternate != net) {
8029                                                 break;
8030                                         }
8031                                 }
8032                         } else {
8033                                 if (chk->whoTo != net) {
8034                                         break;
8035                                 }
8036                         }
8037                         if (chk->data == NULL) {
8038                                 break;
8039                         }
8040                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
8041                             chk->sent != SCTP_DATAGRAM_RESEND) {
8042                                 break;
8043                         }
8044                         /*
8045                          * if no AUTH is yet included and this chunk
8046                          * requires it, make sure to account for it.  We
8047                          * don't apply the size until the AUTH chunk is
8048                          * actually added below in case there is no room for
8049                          * this chunk. NOTE: we overload the use of "omtu"
8050                          * here
8051                          */
8052                         if ((auth == NULL) &&
8053                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8054                             stcb->asoc.peer_auth_chunks)) {
8055                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8056                         } else
8057                                 omtu = 0;
8058                         /* Here we do NOT factor the r_mtu */
8059                         if ((chk->send_size < (int)(mtu - omtu)) ||
8060                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8061                                 /*
8062                                  * We probably should glom the mbuf chain
8063                                  * from the chk->data for control but the
8064                                  * problem is it becomes yet one more level
8065                                  * of tracking to do if for some reason
8066                                  * output fails. Then I have got to
8067                                  * reconstruct the merged control chain.. el
8068                                  * yucko.. for now we take the easy way and
8069                                  * do the copy
8070                                  */
8071                                 /*
8072                                  * Add an AUTH chunk, if chunk requires it
8073                                  * save the offset into the chain for AUTH
8074                                  */
8075                                 if ((auth == NULL) &&
8076                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8077                                     stcb->asoc.peer_auth_chunks))) {
8078                                         outchain = sctp_add_auth_chunk(outchain,
8079                                             &endoutchain,
8080                                             &auth,
8081                                             &auth_offset,
8082                                             stcb,
8083                                             chk->rec.chunk_id.id);
8084                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8085                                 }
8086                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8087                                     (int)chk->rec.chunk_id.can_take_data,
8088                                     chk->send_size, chk->copy_by_ref);
8089                                 if (outchain == NULL) {
8090                                         *reason_code = 8;
8091                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8092                                         return (ENOMEM);
8093                                 }
8094                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8095                                 /* update our MTU size */
8096                                 if (mtu > (chk->send_size + omtu))
8097                                         mtu -= (chk->send_size + omtu);
8098                                 else
8099                                         mtu = 0;
8100                                 to_out += (chk->send_size + omtu);
8101                                 /* Do clear IP_DF ? */
8102                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8103                                         no_fragmentflg = 0;
8104                                 }
8105                                 if (chk->rec.chunk_id.can_take_data)
8106                                         chk->data = NULL;
8107                                 /*
8108                                  * set hb flag since we can use these for
8109                                  * RTO
8110                                  */
8111                                 hbflag = 1;
8112                                 asconf = 1;
8113                                 /*
8114                                  * should sysctl this: don't bundle data
8115                                  * with ASCONF since it requires AUTH
8116                                  */
8117                                 no_data_chunks = 1;
8118                                 chk->sent = SCTP_DATAGRAM_SENT;
8119                                 if (chk->whoTo == NULL) {
8120                                         chk->whoTo = net;
8121                                         atomic_add_int(&net->ref_count, 1);
8122                                 }
8123                                 chk->snd_count++;
8124                                 if (mtu == 0) {
8125                                         /*
8126                                          * Ok we are out of room but we can
8127                                          * output without effecting the
8128                                          * flight size since this little guy
8129                                          * is a control only packet.
8130                                          */
8131                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8132                                         /*
8133                                          * do NOT clear the asconf flag as
8134                                          * it is used to do appropriate
8135                                          * source address selection.
8136                                          */
8137                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8138                                             (struct sockaddr *)&net->ro._l_addr,
8139                                             outchain, auth_offset, auth,
8140                                             stcb->asoc.authinfo.active_keyid,
8141                                             no_fragmentflg, 0, asconf,
8142                                             inp->sctp_lport, stcb->rport,
8143                                             htonl(stcb->asoc.peer_vtag),
8144                                             net->port, NULL,
8145                                             0, 0,
8146                                             so_locked))) {
8147                                                 if (error == ENOBUFS) {
8148                                                         asoc->ifp_had_enobuf = 1;
8149                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8150                                                 }
8151                                                 if (from_where == 0) {
8152                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8153                                                 }
8154                                                 if (*now_filled == 0) {
8155                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8156                                                         *now_filled = 1;
8157                                                         *now = net->last_sent_time;
8158                                                 } else {
8159                                                         net->last_sent_time = *now;
8160                                                 }
8161                                                 hbflag = 0;
8162                                                 /* error, could not output */
8163                                                 if (error == EHOSTUNREACH) {
8164                                                         /*
8165                                                          * Destination went
8166                                                          * unreachable
8167                                                          * during this send
8168                                                          */
8169                                                         sctp_move_chunks_from_net(stcb, net);
8170                                                 }
8171                                                 *reason_code = 7;
8172                                                 continue;
8173                                         } else
8174                                                 asoc->ifp_had_enobuf = 0;
8175                                         if (*now_filled == 0) {
8176                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8177                                                 *now_filled = 1;
8178                                                 *now = net->last_sent_time;
8179                                         } else {
8180                                                 net->last_sent_time = *now;
8181                                         }
8182                                         hbflag = 0;
8183                                         /*
8184                                          * increase the number we sent, if a
8185                                          * cookie is sent we don't tell them
8186                                          * any was sent out.
8187                                          */
8188                                         outchain = endoutchain = NULL;
8189                                         auth = NULL;
8190                                         auth_offset = 0;
8191                                         if (!no_out_cnt)
8192                                                 *num_out += ctl_cnt;
8193                                         /* recalc a clean slate and setup */
8194                                         switch (net->ro._l_addr.sa.sa_family) {
8195 #ifdef INET
8196                                         case AF_INET:
8197                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8198                                                 break;
8199 #endif
8200 #ifdef INET6
8201                                         case AF_INET6:
8202                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8203                                                 break;
8204 #endif
8205                                         default:
8206                                                 /* TSNH */
8207                                                 mtu = net->mtu;
8208                                                 break;
8209                                         }
8210                                         to_out = 0;
8211                                         no_fragmentflg = 1;
8212                                 }
8213                         }
8214                 }
8215                 /************************/
8216                 /* Control transmission */
8217                 /************************/
8218                 /* Now first lets go through the control queue */
8219                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
8220                         if ((sack_goes_to) &&
8221                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
8222                             (chk->whoTo != sack_goes_to)) {
8223                                 /*
8224                                  * if we have a sack in queue, and we are
8225                                  * looking at an ecn echo that is NOT queued
8226                                  * to where the sack is going..
8227                                  */
8228                                 if (chk->whoTo == net) {
8229                                         /*
8230                                          * Don't transmit it to where its
8231                                          * going (current net)
8232                                          */
8233                                         continue;
8234                                 } else if (sack_goes_to == net) {
8235                                         /*
8236                                          * But do transmit it to this
8237                                          * address
8238                                          */
8239                                         goto skip_net_check;
8240                                 }
8241                         }
8242                         if (chk->whoTo == NULL) {
8243                                 if (asoc->alternate == NULL) {
8244                                         if (asoc->primary_destination != net) {
8245                                                 continue;
8246                                         }
8247                                 } else {
8248                                         if (asoc->alternate != net) {
8249                                                 continue;
8250                                         }
8251                                 }
8252                         } else {
8253                                 if (chk->whoTo != net) {
8254                                         continue;
8255                                 }
8256                         }
8257         skip_net_check:
8258                         if (chk->data == NULL) {
8259                                 continue;
8260                         }
8261                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
8262                                 /*
8263                                  * It must be unsent. Cookies and ASCONF's
8264                                  * hang around but there timers will force
8265                                  * when marked for resend.
8266                                  */
8267                                 continue;
8268                         }
8269                         /*
8270                          * if no AUTH is yet included and this chunk
8271                          * requires it, make sure to account for it.  We
8272                          * don't apply the size until the AUTH chunk is
8273                          * actually added below in case there is no room for
8274                          * this chunk. NOTE: we overload the use of "omtu"
8275                          * here
8276                          */
8277                         if ((auth == NULL) &&
8278                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8279                             stcb->asoc.peer_auth_chunks)) {
8280                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8281                         } else
8282                                 omtu = 0;
8283                         /* Here we do NOT factor the r_mtu */
8284                         if ((chk->send_size <= (int)(mtu - omtu)) ||
8285                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
8286                                 /*
8287                                  * We probably should glom the mbuf chain
8288                                  * from the chk->data for control but the
8289                                  * problem is it becomes yet one more level
8290                                  * of tracking to do if for some reason
8291                                  * output fails. Then I have got to
8292                                  * reconstruct the merged control chain.. el
8293                                  * yucko.. for now we take the easy way and
8294                                  * do the copy
8295                                  */
8296                                 /*
8297                                  * Add an AUTH chunk, if chunk requires it
8298                                  * save the offset into the chain for AUTH
8299                                  */
8300                                 if ((auth == NULL) &&
8301                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
8302                                     stcb->asoc.peer_auth_chunks))) {
8303                                         outchain = sctp_add_auth_chunk(outchain,
8304                                             &endoutchain,
8305                                             &auth,
8306                                             &auth_offset,
8307                                             stcb,
8308                                             chk->rec.chunk_id.id);
8309                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8310                                 }
8311                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
8312                                     (int)chk->rec.chunk_id.can_take_data,
8313                                     chk->send_size, chk->copy_by_ref);
8314                                 if (outchain == NULL) {
8315                                         *reason_code = 8;
8316                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8317                                         return (ENOMEM);
8318                                 }
8319                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8320                                 /* update our MTU size */
8321                                 if (mtu > (chk->send_size + omtu))
8322                                         mtu -= (chk->send_size + omtu);
8323                                 else
8324                                         mtu = 0;
8325                                 to_out += (chk->send_size + omtu);
8326                                 /* Do clear IP_DF ? */
8327                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8328                                         no_fragmentflg = 0;
8329                                 }
8330                                 if (chk->rec.chunk_id.can_take_data)
8331                                         chk->data = NULL;
8332                                 /* Mark things to be removed, if needed */
8333                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8334                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
8335                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
8336                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
8337                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
8338                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
8339                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
8340                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
8341                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
8342                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
8343                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
8344                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
8345                                                 hbflag = 1;
8346                                         }
8347                                         /* remove these chunks at the end */
8348                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
8349                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
8350                                                 /* turn off the timer */
8351                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
8352                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
8353                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
8354                                                 }
8355                                         }
8356                                         ctl_cnt++;
8357                                 } else {
8358                                         /*
8359                                          * Other chunks, since they have
8360                                          * timers running (i.e. COOKIE) we
8361                                          * just "trust" that it gets sent or
8362                                          * retransmitted.
8363                                          */
8364                                         ctl_cnt++;
8365                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
8366                                                 cookie = 1;
8367                                                 no_out_cnt = 1;
8368                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
8369                                                 /*
8370                                                  * Increment ecne send count
8371                                                  * here this means we may be
8372                                                  * over-zealous in our
8373                                                  * counting if the send
8374                                                  * fails, but its the best
8375                                                  * place to do it (we used
8376                                                  * to do it in the queue of
8377                                                  * the chunk, but that did
8378                                                  * not tell how many times
8379                                                  * it was sent.
8380                                                  */
8381                                                 SCTP_STAT_INCR(sctps_sendecne);
8382                                         }
8383                                         chk->sent = SCTP_DATAGRAM_SENT;
8384                                         if (chk->whoTo == NULL) {
8385                                                 chk->whoTo = net;
8386                                                 atomic_add_int(&net->ref_count, 1);
8387                                         }
8388                                         chk->snd_count++;
8389                                 }
8390                                 if (mtu == 0) {
8391                                         /*
8392                                          * Ok we are out of room but we can
8393                                          * output without effecting the
8394                                          * flight size since this little guy
8395                                          * is a control only packet.
8396                                          */
8397                                         if (asconf) {
8398                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
8399                                                 /*
8400                                                  * do NOT clear the asconf
8401                                                  * flag as it is used to do
8402                                                  * appropriate source
8403                                                  * address selection.
8404                                                  */
8405                                         }
8406                                         if (cookie) {
8407                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8408                                                 cookie = 0;
8409                                         }
8410                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
8411                                             (struct sockaddr *)&net->ro._l_addr,
8412                                             outchain,
8413                                             auth_offset, auth,
8414                                             stcb->asoc.authinfo.active_keyid,
8415                                             no_fragmentflg, 0, asconf,
8416                                             inp->sctp_lport, stcb->rport,
8417                                             htonl(stcb->asoc.peer_vtag),
8418                                             net->port, NULL,
8419                                             0, 0,
8420                                             so_locked))) {
8421                                                 if (error == ENOBUFS) {
8422                                                         asoc->ifp_had_enobuf = 1;
8423                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8424                                                 }
8425                                                 if (from_where == 0) {
8426                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8427                                                 }
8428                                                 /* error, could not output */
8429                                                 if (hbflag) {
8430                                                         if (*now_filled == 0) {
8431                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8432                                                                 *now_filled = 1;
8433                                                                 *now = net->last_sent_time;
8434                                                         } else {
8435                                                                 net->last_sent_time = *now;
8436                                                         }
8437                                                         hbflag = 0;
8438                                                 }
8439                                                 if (error == EHOSTUNREACH) {
8440                                                         /*
8441                                                          * Destination went
8442                                                          * unreachable
8443                                                          * during this send
8444                                                          */
8445                                                         sctp_move_chunks_from_net(stcb, net);
8446                                                 }
8447                                                 *reason_code = 7;
8448                                                 continue;
8449                                         } else
8450                                                 asoc->ifp_had_enobuf = 0;
8451                                         /* Only HB or ASCONF advances time */
8452                                         if (hbflag) {
8453                                                 if (*now_filled == 0) {
8454                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8455                                                         *now_filled = 1;
8456                                                         *now = net->last_sent_time;
8457                                                 } else {
8458                                                         net->last_sent_time = *now;
8459                                                 }
8460                                                 hbflag = 0;
8461                                         }
8462                                         /*
8463                                          * increase the number we sent, if a
8464                                          * cookie is sent we don't tell them
8465                                          * any was sent out.
8466                                          */
8467                                         outchain = endoutchain = NULL;
8468                                         auth = NULL;
8469                                         auth_offset = 0;
8470                                         if (!no_out_cnt)
8471                                                 *num_out += ctl_cnt;
8472                                         /* recalc a clean slate and setup */
8473                                         switch (net->ro._l_addr.sa.sa_family) {
8474 #ifdef INET
8475                                         case AF_INET:
8476                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
8477                                                 break;
8478 #endif
8479 #ifdef INET6
8480                                         case AF_INET6:
8481                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
8482                                                 break;
8483 #endif
8484                                         default:
8485                                                 /* TSNH */
8486                                                 mtu = net->mtu;
8487                                                 break;
8488                                         }
8489                                         to_out = 0;
8490                                         no_fragmentflg = 1;
8491                                 }
8492                         }
8493                 }
8494                 /* JRI: if dest is in PF state, do not send data to it */
8495                 if ((asoc->sctp_cmt_on_off > 0) &&
8496                     (net != stcb->asoc.alternate) &&
8497                     (net->dest_state & SCTP_ADDR_PF)) {
8498                         goto no_data_fill;
8499                 }
8500                 if (net->flight_size >= net->cwnd) {
8501                         goto no_data_fill;
8502                 }
8503                 if ((asoc->sctp_cmt_on_off > 0) &&
8504                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
8505                     (net->flight_size > max_rwnd_per_dest)) {
8506                         goto no_data_fill;
8507                 }
8508                 /*
8509                  * We need a specific accounting for the usage of the send
8510                  * buffer. We also need to check the number of messages per
8511                  * net. For now, this is better than nothing and it disabled
8512                  * by default...
8513                  */
8514                 if ((asoc->sctp_cmt_on_off > 0) &&
8515                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
8516                     (max_send_per_dest > 0) &&
8517                     (net->flight_size > max_send_per_dest)) {
8518                         goto no_data_fill;
8519                 }
8520                 /*********************/
8521                 /* Data transmission */
8522                 /*********************/
8523                 /*
8524                  * if AUTH for DATA is required and no AUTH has been added
8525                  * yet, account for this in the mtu now... if no data can be
8526                  * bundled, this adjustment won't matter anyways since the
8527                  * packet will be going out...
8528                  */
8529                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
8530                     stcb->asoc.peer_auth_chunks);
8531                 if (data_auth_reqd && (auth == NULL)) {
8532                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
8533                 }
8534                 /* now lets add any data within the MTU constraints */
8535                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
8536 #ifdef INET
8537                 case AF_INET:
8538                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
8539                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
8540                         else
8541                                 omtu = 0;
8542                         break;
8543 #endif
8544 #ifdef INET6
8545                 case AF_INET6:
8546                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
8547                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
8548                         else
8549                                 omtu = 0;
8550                         break;
8551 #endif
8552                 default:
8553                         /* TSNH */
8554                         omtu = 0;
8555                         break;
8556                 }
8557                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) &&
8558                     (skip_data_for_this_net == 0)) ||
8559                     (cookie)) {
8560                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
8561                                 if (no_data_chunks) {
8562                                         /* let only control go out */
8563                                         *reason_code = 1;
8564                                         break;
8565                                 }
8566                                 if (net->flight_size >= net->cwnd) {
8567                                         /* skip this net, no room for data */
8568                                         *reason_code = 2;
8569                                         break;
8570                                 }
8571                                 if ((chk->whoTo != NULL) &&
8572                                     (chk->whoTo != net)) {
8573                                         /* Don't send the chunk on this net */
8574                                         continue;
8575                                 }
8576                                 if (asoc->sctp_cmt_on_off == 0) {
8577                                         if ((asoc->alternate) &&
8578                                             (asoc->alternate != net) &&
8579                                             (chk->whoTo == NULL)) {
8580                                                 continue;
8581                                         } else if ((net != asoc->primary_destination) &&
8582                                                     (asoc->alternate == NULL) &&
8583                                             (chk->whoTo == NULL)) {
8584                                                 continue;
8585                                         }
8586                                 }
8587                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
8588                                         /*-
8589                                          * strange, we have a chunk that is
8590                                          * to big for its destination and
8591                                          * yet no fragment ok flag.
8592                                          * Something went wrong when the
8593                                          * PMTU changed...we did not mark
8594                                          * this chunk for some reason?? I
8595                                          * will fix it here by letting IP
8596                                          * fragment it for now and printing
8597                                          * a warning. This really should not
8598                                          * happen ...
8599                                          */
8600                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
8601                                             chk->send_size, mtu);
8602                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
8603                                 }
8604                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
8605                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
8606                                         struct sctp_data_chunk *dchkh;
8607
8608                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
8609                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
8610                                 }
8611                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
8612                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
8613                                         /* ok we will add this one */
8614
8615                                         /*
8616                                          * Add an AUTH chunk, if chunk
8617                                          * requires it, save the offset into
8618                                          * the chain for AUTH
8619                                          */
8620                                         if (data_auth_reqd) {
8621                                                 if (auth == NULL) {
8622                                                         outchain = sctp_add_auth_chunk(outchain,
8623                                                             &endoutchain,
8624                                                             &auth,
8625                                                             &auth_offset,
8626                                                             stcb,
8627                                                             SCTP_DATA);
8628                                                         auth_keyid = chk->auth_keyid;
8629                                                         override_ok = 0;
8630                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
8631                                                 } else if (override_ok) {
8632                                                         /*
8633                                                          * use this data's
8634                                                          * keyid
8635                                                          */
8636                                                         auth_keyid = chk->auth_keyid;
8637                                                         override_ok = 0;
8638                                                 } else if (auth_keyid != chk->auth_keyid) {
8639                                                         /*
8640                                                          * different keyid,
8641                                                          * so done bundling
8642                                                          */
8643                                                         break;
8644                                                 }
8645                                         }
8646                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
8647                                             chk->send_size, chk->copy_by_ref);
8648                                         if (outchain == NULL) {
8649                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
8650                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
8651                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8652                                                 }
8653                                                 *reason_code = 3;
8654                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
8655                                                 return (ENOMEM);
8656                                         }
8657                                         /* upate our MTU size */
8658                                         /* Do clear IP_DF ? */
8659                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
8660                                                 no_fragmentflg = 0;
8661                                         }
8662                                         /* unsigned subtraction of mtu */
8663                                         if (mtu > chk->send_size)
8664                                                 mtu -= chk->send_size;
8665                                         else
8666                                                 mtu = 0;
8667                                         /* unsigned subtraction of r_mtu */
8668                                         if (r_mtu > chk->send_size)
8669                                                 r_mtu -= chk->send_size;
8670                                         else
8671                                                 r_mtu = 0;
8672
8673                                         to_out += chk->send_size;
8674                                         if ((to_out > mx_mtu) && no_fragmentflg) {
8675 #ifdef INVARIANTS
8676                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
8677 #else
8678                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
8679                                                     mx_mtu, to_out);
8680 #endif
8681                                         }
8682                                         chk->window_probe = 0;
8683                                         data_list[bundle_at++] = chk;
8684                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
8685                                                 break;
8686                                         }
8687                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
8688                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
8689                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
8690                                                 } else {
8691                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
8692                                                 }
8693                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
8694                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
8695                                                         /*
8696                                                          * Count number of
8697                                                          * user msg's that
8698                                                          * were fragmented
8699                                                          * we do this by
8700                                                          * counting when we
8701                                                          * see a LAST
8702                                                          * fragment only.
8703                                                          */
8704                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
8705                                         }
8706                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
8707                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
8708                                                         data_list[0]->window_probe = 1;
8709                                                         net->window_probe = 1;
8710                                                 }
8711                                                 break;
8712                                         }
8713                                 } else {
8714                                         /*
8715                                          * Must be sent in order of the
8716                                          * TSN's (on a network)
8717                                          */
8718                                         break;
8719                                 }
8720                         }       /* for (chunk gather loop for this net) */
8721                 }               /* if asoc.state OPEN */
8722 no_data_fill:
8723                 /* Is there something to send for this destination? */
8724                 if (outchain) {
8725                         /* We may need to start a control timer or two */
8726                         if (asconf) {
8727                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
8728                                     stcb, net);
8729                                 /*
8730                                  * do NOT clear the asconf flag as it is
8731                                  * used to do appropriate source address
8732                                  * selection.
8733                                  */
8734                         }
8735                         if (cookie) {
8736                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
8737                                 cookie = 0;
8738                         }
8739                         /* must start a send timer if data is being sent */
8740                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
8741                                 /*
8742                                  * no timer running on this destination
8743                                  * restart it.
8744                                  */
8745                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
8746                         }
8747                         /* Now send it, if there is anything to send :> */
8748                         if ((error = sctp_lowlevel_chunk_output(inp,
8749                             stcb,
8750                             net,
8751                             (struct sockaddr *)&net->ro._l_addr,
8752                             outchain,
8753                             auth_offset,
8754                             auth,
8755                             auth_keyid,
8756                             no_fragmentflg,
8757                             bundle_at,
8758                             asconf,
8759                             inp->sctp_lport, stcb->rport,
8760                             htonl(stcb->asoc.peer_vtag),
8761                             net->port, NULL,
8762                             0, 0,
8763                             so_locked))) {
8764                                 /* error, we could not output */
8765                                 if (error == ENOBUFS) {
8766                                         SCTP_STAT_INCR(sctps_lowlevelerr);
8767                                         asoc->ifp_had_enobuf = 1;
8768                                 }
8769                                 if (from_where == 0) {
8770                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
8771                                 }
8772                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
8773                                 if (hbflag) {
8774                                         if (*now_filled == 0) {
8775                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8776                                                 *now_filled = 1;
8777                                                 *now = net->last_sent_time;
8778                                         } else {
8779                                                 net->last_sent_time = *now;
8780                                         }
8781                                         hbflag = 0;
8782                                 }
8783                                 if (error == EHOSTUNREACH) {
8784                                         /*
8785                                          * Destination went unreachable
8786                                          * during this send
8787                                          */
8788                                         sctp_move_chunks_from_net(stcb, net);
8789                                 }
8790                                 *reason_code = 6;
8791                                 /*-
8792                                  * I add this line to be paranoid. As far as
8793                                  * I can tell the continue, takes us back to
8794                                  * the top of the for, but just to make sure
8795                                  * I will reset these again here.
8796                                  */
8797                                 ctl_cnt = bundle_at = 0;
8798                                 continue;       /* This takes us back to the
8799                                                  * for() for the nets. */
8800                         } else {
8801                                 asoc->ifp_had_enobuf = 0;
8802                         }
8803                         endoutchain = NULL;
8804                         auth = NULL;
8805                         auth_offset = 0;
8806                         if (bundle_at || hbflag) {
8807                                 /* For data/asconf and hb set time */
8808                                 if (*now_filled == 0) {
8809                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
8810                                         *now_filled = 1;
8811                                         *now = net->last_sent_time;
8812                                 } else {
8813                                         net->last_sent_time = *now;
8814                                 }
8815                         }
8816                         if (!no_out_cnt) {
8817                                 *num_out += (ctl_cnt + bundle_at);
8818                         }
8819                         if (bundle_at) {
8820                                 /* setup for a RTO measurement */
8821                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
8822                                 /* fill time if not already filled */
8823                                 if (*now_filled == 0) {
8824                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
8825                                         *now_filled = 1;
8826                                         *now = asoc->time_last_sent;
8827                                 } else {
8828                                         asoc->time_last_sent = *now;
8829                                 }
8830                                 if (net->rto_needed) {
8831                                         data_list[0]->do_rtt = 1;
8832                                         net->rto_needed = 0;
8833                                 }
8834                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
8835                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
8836                         }
8837                         if (one_chunk) {
8838                                 break;
8839                         }
8840                 }
8841                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8842                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
8843                 }
8844         }
8845         if (old_start_at == NULL) {
8846                 old_start_at = start_at;
8847                 start_at = TAILQ_FIRST(&asoc->nets);
8848                 if (old_start_at)
8849                         goto again_one_more_time;
8850         }
8851         /*
8852          * At the end there should be no NON timed chunks hanging on this
8853          * queue.
8854          */
8855         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
8856                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
8857         }
8858         if ((*num_out == 0) && (*reason_code == 0)) {
8859                 *reason_code = 4;
8860         } else {
8861                 *reason_code = 5;
8862         }
8863         sctp_clean_up_ctl(stcb, asoc, so_locked);
8864         return (0);
8865 }
8866
8867 void
8868 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
8869 {
8870         /*-
8871          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
8872          * the control chunk queue.
8873          */
8874         struct sctp_chunkhdr *hdr;
8875         struct sctp_tmit_chunk *chk;
8876         struct mbuf *mat;
8877
8878         SCTP_TCB_LOCK_ASSERT(stcb);
8879         sctp_alloc_a_chunk(stcb, chk);
8880         if (chk == NULL) {
8881                 /* no memory */
8882                 sctp_m_freem(op_err);
8883                 return;
8884         }
8885         chk->copy_by_ref = 0;
8886         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
8887         if (op_err == NULL) {
8888                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
8889                 return;
8890         }
8891         chk->send_size = 0;
8892         mat = op_err;
8893         while (mat != NULL) {
8894                 chk->send_size += SCTP_BUF_LEN(mat);
8895                 mat = SCTP_BUF_NEXT(mat);
8896         }
8897         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
8898         chk->rec.chunk_id.can_take_data = 1;
8899         chk->sent = SCTP_DATAGRAM_UNSENT;
8900         chk->snd_count = 0;
8901         chk->flags = 0;
8902         chk->asoc = &stcb->asoc;
8903         chk->data = op_err;
8904         chk->whoTo = NULL;
8905         hdr = mtod(op_err, struct sctp_chunkhdr *);
8906         hdr->chunk_type = SCTP_OPERATION_ERROR;
8907         hdr->chunk_flags = 0;
8908         hdr->chunk_length = htons(chk->send_size);
8909         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
8910             chk,
8911             sctp_next);
8912         chk->asoc->ctrl_queue_cnt++;
8913 }
8914
8915 int
8916 sctp_send_cookie_echo(struct mbuf *m,
8917     int offset,
8918     struct sctp_tcb *stcb,
8919     struct sctp_nets *net)
8920 {
8921         /*-
8922          * pull out the cookie and put it at the front of the control chunk
8923          * queue.
8924          */
8925         int at;
8926         struct mbuf *cookie;
8927         struct sctp_paramhdr parm, *phdr;
8928         struct sctp_chunkhdr *hdr;
8929         struct sctp_tmit_chunk *chk;
8930         uint16_t ptype, plen;
8931
8932         /* First find the cookie in the param area */
8933         cookie = NULL;
8934         at = offset + sizeof(struct sctp_init_chunk);
8935
8936         SCTP_TCB_LOCK_ASSERT(stcb);
8937         do {
8938                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
8939                 if (phdr == NULL) {
8940                         return (-3);
8941                 }
8942                 ptype = ntohs(phdr->param_type);
8943                 plen = ntohs(phdr->param_length);
8944                 if (ptype == SCTP_STATE_COOKIE) {
8945                         int pad;
8946
8947                         /* found the cookie */
8948                         if ((pad = (plen % 4))) {
8949                                 plen += 4 - pad;
8950                         }
8951                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
8952                         if (cookie == NULL) {
8953                                 /* No memory */
8954                                 return (-2);
8955                         }
8956 #ifdef SCTP_MBUF_LOGGING
8957                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
8958                                 struct mbuf *mat;
8959
8960                                 for (mat = cookie; mat; mat = SCTP_BUF_NEXT(mat)) {
8961                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
8962                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
8963                                         }
8964                                 }
8965                         }
8966 #endif
8967                         break;
8968                 }
8969                 at += SCTP_SIZE32(plen);
8970         } while (phdr);
8971         if (cookie == NULL) {
8972                 /* Did not find the cookie */
8973                 return (-3);
8974         }
8975         /* ok, we got the cookie lets change it into a cookie echo chunk */
8976
8977         /* first the change from param to cookie */
8978         hdr = mtod(cookie, struct sctp_chunkhdr *);
8979         hdr->chunk_type = SCTP_COOKIE_ECHO;
8980         hdr->chunk_flags = 0;
8981         /* get the chunk stuff now and place it in the FRONT of the queue */
8982         sctp_alloc_a_chunk(stcb, chk);
8983         if (chk == NULL) {
8984                 /* no memory */
8985                 sctp_m_freem(cookie);
8986                 return (-5);
8987         }
8988         chk->copy_by_ref = 0;
8989         chk->send_size = plen;
8990         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
8991         chk->rec.chunk_id.can_take_data = 0;
8992         chk->sent = SCTP_DATAGRAM_UNSENT;
8993         chk->snd_count = 0;
8994         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
8995         chk->asoc = &stcb->asoc;
8996         chk->data = cookie;
8997         chk->whoTo = net;
8998         atomic_add_int(&chk->whoTo->ref_count, 1);
8999         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
9000         chk->asoc->ctrl_queue_cnt++;
9001         return (0);
9002 }
9003
9004 void
9005 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
9006     struct mbuf *m,
9007     int offset,
9008     int chk_length,
9009     struct sctp_nets *net)
9010 {
9011         /*
9012          * take a HB request and make it into a HB ack and send it.
9013          */
9014         struct mbuf *outchain;
9015         struct sctp_chunkhdr *chdr;
9016         struct sctp_tmit_chunk *chk;
9017
9018
9019         if (net == NULL)
9020                 /* must have a net pointer */
9021                 return;
9022
9023         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
9024         if (outchain == NULL) {
9025                 /* gak out of memory */
9026                 return;
9027         }
9028 #ifdef SCTP_MBUF_LOGGING
9029         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9030                 struct mbuf *mat;
9031
9032                 for (mat = outchain; mat; mat = SCTP_BUF_NEXT(mat)) {
9033                         if (SCTP_BUF_IS_EXTENDED(mat)) {
9034                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9035                         }
9036                 }
9037         }
9038 #endif
9039         chdr = mtod(outchain, struct sctp_chunkhdr *);
9040         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
9041         chdr->chunk_flags = 0;
9042         if (chk_length % 4) {
9043                 /* need pad */
9044                 uint32_t cpthis = 0;
9045                 int padlen;
9046
9047                 padlen = 4 - (chk_length % 4);
9048                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
9049         }
9050         sctp_alloc_a_chunk(stcb, chk);
9051         if (chk == NULL) {
9052                 /* no memory */
9053                 sctp_m_freem(outchain);
9054                 return;
9055         }
9056         chk->copy_by_ref = 0;
9057         chk->send_size = chk_length;
9058         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
9059         chk->rec.chunk_id.can_take_data = 1;
9060         chk->sent = SCTP_DATAGRAM_UNSENT;
9061         chk->snd_count = 0;
9062         chk->flags = 0;
9063         chk->asoc = &stcb->asoc;
9064         chk->data = outchain;
9065         chk->whoTo = net;
9066         atomic_add_int(&chk->whoTo->ref_count, 1);
9067         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9068         chk->asoc->ctrl_queue_cnt++;
9069 }
9070
9071 void
9072 sctp_send_cookie_ack(struct sctp_tcb *stcb)
9073 {
9074         /* formulate and queue a cookie-ack back to sender */
9075         struct mbuf *cookie_ack;
9076         struct sctp_chunkhdr *hdr;
9077         struct sctp_tmit_chunk *chk;
9078
9079         cookie_ack = NULL;
9080         SCTP_TCB_LOCK_ASSERT(stcb);
9081
9082         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
9083         if (cookie_ack == NULL) {
9084                 /* no mbuf's */
9085                 return;
9086         }
9087         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
9088         sctp_alloc_a_chunk(stcb, chk);
9089         if (chk == NULL) {
9090                 /* no memory */
9091                 sctp_m_freem(cookie_ack);
9092                 return;
9093         }
9094         chk->copy_by_ref = 0;
9095         chk->send_size = sizeof(struct sctp_chunkhdr);
9096         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
9097         chk->rec.chunk_id.can_take_data = 1;
9098         chk->sent = SCTP_DATAGRAM_UNSENT;
9099         chk->snd_count = 0;
9100         chk->flags = 0;
9101         chk->asoc = &stcb->asoc;
9102         chk->data = cookie_ack;
9103         if (chk->asoc->last_control_chunk_from != NULL) {
9104                 chk->whoTo = chk->asoc->last_control_chunk_from;
9105                 atomic_add_int(&chk->whoTo->ref_count, 1);
9106         } else {
9107                 chk->whoTo = NULL;
9108         }
9109         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
9110         hdr->chunk_type = SCTP_COOKIE_ACK;
9111         hdr->chunk_flags = 0;
9112         hdr->chunk_length = htons(chk->send_size);
9113         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
9114         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9115         chk->asoc->ctrl_queue_cnt++;
9116         return;
9117 }
9118
9119
9120 void
9121 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
9122 {
9123         /* formulate and queue a SHUTDOWN-ACK back to the sender */
9124         struct mbuf *m_shutdown_ack;
9125         struct sctp_shutdown_ack_chunk *ack_cp;
9126         struct sctp_tmit_chunk *chk;
9127
9128         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9129         if (m_shutdown_ack == NULL) {
9130                 /* no mbuf's */
9131                 return;
9132         }
9133         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
9134         sctp_alloc_a_chunk(stcb, chk);
9135         if (chk == NULL) {
9136                 /* no memory */
9137                 sctp_m_freem(m_shutdown_ack);
9138                 return;
9139         }
9140         chk->copy_by_ref = 0;
9141         chk->send_size = sizeof(struct sctp_chunkhdr);
9142         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
9143         chk->rec.chunk_id.can_take_data = 1;
9144         chk->sent = SCTP_DATAGRAM_UNSENT;
9145         chk->snd_count = 0;
9146         chk->flags = 0;
9147         chk->asoc = &stcb->asoc;
9148         chk->data = m_shutdown_ack;
9149         chk->whoTo = net;
9150         if (chk->whoTo) {
9151                 atomic_add_int(&chk->whoTo->ref_count, 1);
9152         }
9153         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
9154         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
9155         ack_cp->ch.chunk_flags = 0;
9156         ack_cp->ch.chunk_length = htons(chk->send_size);
9157         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
9158         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9159         chk->asoc->ctrl_queue_cnt++;
9160         return;
9161 }
9162
9163 void
9164 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
9165 {
9166         /* formulate and queue a SHUTDOWN to the sender */
9167         struct mbuf *m_shutdown;
9168         struct sctp_shutdown_chunk *shutdown_cp;
9169         struct sctp_tmit_chunk *chk;
9170
9171         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
9172         if (m_shutdown == NULL) {
9173                 /* no mbuf's */
9174                 return;
9175         }
9176         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
9177         sctp_alloc_a_chunk(stcb, chk);
9178         if (chk == NULL) {
9179                 /* no memory */
9180                 sctp_m_freem(m_shutdown);
9181                 return;
9182         }
9183         chk->copy_by_ref = 0;
9184         chk->send_size = sizeof(struct sctp_shutdown_chunk);
9185         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
9186         chk->rec.chunk_id.can_take_data = 1;
9187         chk->sent = SCTP_DATAGRAM_UNSENT;
9188         chk->snd_count = 0;
9189         chk->flags = 0;
9190         chk->asoc = &stcb->asoc;
9191         chk->data = m_shutdown;
9192         chk->whoTo = net;
9193         if (chk->whoTo) {
9194                 atomic_add_int(&chk->whoTo->ref_count, 1);
9195         }
9196         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
9197         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
9198         shutdown_cp->ch.chunk_flags = 0;
9199         shutdown_cp->ch.chunk_length = htons(chk->send_size);
9200         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
9201         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
9202         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9203         chk->asoc->ctrl_queue_cnt++;
9204         return;
9205 }
9206
9207 void
9208 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
9209 {
9210         /*
9211          * formulate and queue an ASCONF to the peer. ASCONF parameters
9212          * should be queued on the assoc queue.
9213          */
9214         struct sctp_tmit_chunk *chk;
9215         struct mbuf *m_asconf;
9216         int len;
9217
9218         SCTP_TCB_LOCK_ASSERT(stcb);
9219
9220         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
9221             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
9222                 /* can't send a new one if there is one in flight already */
9223                 return;
9224         }
9225         /* compose an ASCONF chunk, maximum length is PMTU */
9226         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
9227         if (m_asconf == NULL) {
9228                 return;
9229         }
9230         sctp_alloc_a_chunk(stcb, chk);
9231         if (chk == NULL) {
9232                 /* no memory */
9233                 sctp_m_freem(m_asconf);
9234                 return;
9235         }
9236         chk->copy_by_ref = 0;
9237         chk->data = m_asconf;
9238         chk->send_size = len;
9239         chk->rec.chunk_id.id = SCTP_ASCONF;
9240         chk->rec.chunk_id.can_take_data = 0;
9241         chk->sent = SCTP_DATAGRAM_UNSENT;
9242         chk->snd_count = 0;
9243         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
9244         chk->asoc = &stcb->asoc;
9245         chk->whoTo = net;
9246         if (chk->whoTo) {
9247                 atomic_add_int(&chk->whoTo->ref_count, 1);
9248         }
9249         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
9250         chk->asoc->ctrl_queue_cnt++;
9251         return;
9252 }
9253
9254 void
9255 sctp_send_asconf_ack(struct sctp_tcb *stcb)
9256 {
9257         /*
9258          * formulate and queue a asconf-ack back to sender. the asconf-ack
9259          * must be stored in the tcb.
9260          */
9261         struct sctp_tmit_chunk *chk;
9262         struct sctp_asconf_ack *ack, *latest_ack;
9263         struct mbuf *m_ack;
9264         struct sctp_nets *net = NULL;
9265
9266         SCTP_TCB_LOCK_ASSERT(stcb);
9267         /* Get the latest ASCONF-ACK */
9268         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
9269         if (latest_ack == NULL) {
9270                 return;
9271         }
9272         if (latest_ack->last_sent_to != NULL &&
9273             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
9274                 /* we're doing a retransmission */
9275                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
9276                 if (net == NULL) {
9277                         /* no alternate */
9278                         if (stcb->asoc.last_control_chunk_from == NULL) {
9279                                 if (stcb->asoc.alternate) {
9280                                         net = stcb->asoc.alternate;
9281                                 } else {
9282                                         net = stcb->asoc.primary_destination;
9283                                 }
9284                         } else {
9285                                 net = stcb->asoc.last_control_chunk_from;
9286                         }
9287                 }
9288         } else {
9289                 /* normal case */
9290                 if (stcb->asoc.last_control_chunk_from == NULL) {
9291                         if (stcb->asoc.alternate) {
9292                                 net = stcb->asoc.alternate;
9293                         } else {
9294                                 net = stcb->asoc.primary_destination;
9295                         }
9296                 } else {
9297                         net = stcb->asoc.last_control_chunk_from;
9298                 }
9299         }
9300         latest_ack->last_sent_to = net;
9301
9302         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
9303                 if (ack->data == NULL) {
9304                         continue;
9305                 }
9306                 /* copy the asconf_ack */
9307                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
9308                 if (m_ack == NULL) {
9309                         /* couldn't copy it */
9310                         return;
9311                 }
9312 #ifdef SCTP_MBUF_LOGGING
9313                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
9314                         struct mbuf *mat;
9315
9316                         for (mat = m_ack; mat; mat = SCTP_BUF_NEXT(mat)) {
9317                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
9318                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
9319                                 }
9320                         }
9321                 }
9322 #endif
9323
9324                 sctp_alloc_a_chunk(stcb, chk);
9325                 if (chk == NULL) {
9326                         /* no memory */
9327                         if (m_ack)
9328                                 sctp_m_freem(m_ack);
9329                         return;
9330                 }
9331                 chk->copy_by_ref = 0;
9332
9333                 chk->whoTo = net;
9334                 if (chk->whoTo) {
9335                         atomic_add_int(&chk->whoTo->ref_count, 1);
9336                 }
9337                 chk->data = m_ack;
9338                 chk->send_size = 0;
9339                 /* Get size */
9340                 chk->send_size = ack->len;
9341                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
9342                 chk->rec.chunk_id.can_take_data = 1;
9343                 chk->sent = SCTP_DATAGRAM_UNSENT;
9344                 chk->snd_count = 0;
9345                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
9346                 chk->asoc = &stcb->asoc;
9347
9348                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
9349                 chk->asoc->ctrl_queue_cnt++;
9350         }
9351         return;
9352 }
9353
9354
9355 static int
9356 sctp_chunk_retransmission(struct sctp_inpcb *inp,
9357     struct sctp_tcb *stcb,
9358     struct sctp_association *asoc,
9359     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
9360 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9361     SCTP_UNUSED
9362 #endif
9363 )
9364 {
9365         /*-
9366          * send out one MTU of retransmission. If fast_retransmit is
9367          * happening we ignore the cwnd. Otherwise we obey the cwnd and
9368          * rwnd. For a Cookie or Asconf in the control chunk queue we
9369          * retransmit them by themselves.
9370          *
9371          * For data chunks we will pick out the lowest TSN's in the sent_queue
9372          * marked for resend and bundle them all together (up to a MTU of
9373          * destination). The address to send to should have been
9374          * selected/changed where the retransmission was marked (i.e. in FR
9375          * or t3-timeout routines).
9376          */
9377         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
9378         struct sctp_tmit_chunk *chk, *fwd;
9379         struct mbuf *m, *endofchain;
9380         struct sctp_nets *net = NULL;
9381         uint32_t tsns_sent = 0;
9382         int no_fragmentflg, bundle_at, cnt_thru;
9383         unsigned int mtu;
9384         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
9385         struct sctp_auth_chunk *auth = NULL;
9386         uint32_t auth_offset = 0;
9387         uint16_t auth_keyid;
9388         int override_ok = 1;
9389         int data_auth_reqd = 0;
9390         uint32_t dmtu = 0;
9391
9392         SCTP_TCB_LOCK_ASSERT(stcb);
9393         tmr_started = ctl_cnt = bundle_at = error = 0;
9394         no_fragmentflg = 1;
9395         fwd_tsn = 0;
9396         *cnt_out = 0;
9397         fwd = NULL;
9398         endofchain = m = NULL;
9399         auth_keyid = stcb->asoc.authinfo.active_keyid;
9400 #ifdef SCTP_AUDITING_ENABLED
9401         sctp_audit_log(0xC3, 1);
9402 #endif
9403         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
9404             (TAILQ_EMPTY(&asoc->control_send_queue))) {
9405                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
9406                     asoc->sent_queue_retran_cnt);
9407                 asoc->sent_queue_cnt = 0;
9408                 asoc->sent_queue_cnt_removeable = 0;
9409                 /* send back 0/0 so we enter normal transmission */
9410                 *cnt_out = 0;
9411                 return (0);
9412         }
9413         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
9414                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
9415                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
9416                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
9417                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
9418                                 continue;
9419                         }
9420                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
9421                                 if (chk != asoc->str_reset) {
9422                                         /*
9423                                          * not eligible for retran if its
9424                                          * not ours
9425                                          */
9426                                         continue;
9427                                 }
9428                         }
9429                         ctl_cnt++;
9430                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
9431                                 fwd_tsn = 1;
9432                         }
9433                         /*
9434                          * Add an AUTH chunk, if chunk requires it save the
9435                          * offset into the chain for AUTH
9436                          */
9437                         if ((auth == NULL) &&
9438                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
9439                             stcb->asoc.peer_auth_chunks))) {
9440                                 m = sctp_add_auth_chunk(m, &endofchain,
9441                                     &auth, &auth_offset,
9442                                     stcb,
9443                                     chk->rec.chunk_id.id);
9444                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9445                         }
9446                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9447                         break;
9448                 }
9449         }
9450         one_chunk = 0;
9451         cnt_thru = 0;
9452         /* do we have control chunks to retransmit? */
9453         if (m != NULL) {
9454                 /* Start a timer no matter if we suceed or fail */
9455                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
9456                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
9457                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
9458                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
9459                 chk->snd_count++;       /* update our count */
9460                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
9461                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
9462                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
9463                     no_fragmentflg, 0, 0,
9464                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9465                     chk->whoTo->port, NULL,
9466                     0, 0,
9467                     so_locked))) {
9468                         SCTP_STAT_INCR(sctps_lowlevelerr);
9469                         return (error);
9470                 }
9471                 endofchain = NULL;
9472                 auth = NULL;
9473                 auth_offset = 0;
9474                 /*
9475                  * We don't want to mark the net->sent time here since this
9476                  * we use this for HB and retrans cannot measure RTT
9477                  */
9478                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
9479                 *cnt_out += 1;
9480                 chk->sent = SCTP_DATAGRAM_SENT;
9481                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
9482                 if (fwd_tsn == 0) {
9483                         return (0);
9484                 } else {
9485                         /* Clean up the fwd-tsn list */
9486                         sctp_clean_up_ctl(stcb, asoc, so_locked);
9487                         return (0);
9488                 }
9489         }
9490         /*
9491          * Ok, it is just data retransmission we need to do or that and a
9492          * fwd-tsn with it all.
9493          */
9494         if (TAILQ_EMPTY(&asoc->sent_queue)) {
9495                 return (SCTP_RETRAN_DONE);
9496         }
9497         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
9498             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
9499                 /* not yet open, resend the cookie and that is it */
9500                 return (1);
9501         }
9502 #ifdef SCTP_AUDITING_ENABLED
9503         sctp_auditing(20, inp, stcb, NULL);
9504 #endif
9505         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
9506         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
9507                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
9508                         /* No, not sent to this net or not ready for rtx */
9509                         continue;
9510                 }
9511                 if (chk->data == NULL) {
9512                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
9513                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
9514                         continue;
9515                 }
9516                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
9517                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
9518                         /* Gak, we have exceeded max unlucky retran, abort! */
9519                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
9520                             chk->snd_count,
9521                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
9522                         atomic_add_int(&stcb->asoc.refcnt, 1);
9523                         sctp_abort_an_association(stcb->sctp_ep, stcb, NULL, so_locked);
9524                         SCTP_TCB_LOCK(stcb);
9525                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
9526                         return (SCTP_RETRAN_EXIT);
9527                 }
9528                 /* pick up the net */
9529                 net = chk->whoTo;
9530                 switch (net->ro._l_addr.sa.sa_family) {
9531 #ifdef INET
9532                 case AF_INET:
9533                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
9534                         break;
9535 #endif
9536 #ifdef INET6
9537                 case AF_INET6:
9538                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
9539                         break;
9540 #endif
9541                 default:
9542                         /* TSNH */
9543                         mtu = net->mtu;
9544                         break;
9545                 }
9546
9547                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
9548                         /* No room in peers rwnd */
9549                         uint32_t tsn;
9550
9551                         tsn = asoc->last_acked_seq + 1;
9552                         if (tsn == chk->rec.data.TSN_seq) {
9553                                 /*
9554                                  * we make a special exception for this
9555                                  * case. The peer has no rwnd but is missing
9556                                  * the lowest chunk.. which is probably what
9557                                  * is holding up the rwnd.
9558                                  */
9559                                 goto one_chunk_around;
9560                         }
9561                         return (1);
9562                 }
9563 one_chunk_around:
9564                 if (asoc->peers_rwnd < mtu) {
9565                         one_chunk = 1;
9566                         if ((asoc->peers_rwnd == 0) &&
9567                             (asoc->total_flight == 0)) {
9568                                 chk->window_probe = 1;
9569                                 chk->whoTo->window_probe = 1;
9570                         }
9571                 }
9572 #ifdef SCTP_AUDITING_ENABLED
9573                 sctp_audit_log(0xC3, 2);
9574 #endif
9575                 bundle_at = 0;
9576                 m = NULL;
9577                 net->fast_retran_ip = 0;
9578                 if (chk->rec.data.doing_fast_retransmit == 0) {
9579                         /*
9580                          * if no FR in progress skip destination that have
9581                          * flight_size > cwnd.
9582                          */
9583                         if (net->flight_size >= net->cwnd) {
9584                                 continue;
9585                         }
9586                 } else {
9587                         /*
9588                          * Mark the destination net to have FR recovery
9589                          * limits put on it.
9590                          */
9591                         *fr_done = 1;
9592                         net->fast_retran_ip = 1;
9593                 }
9594
9595                 /*
9596                  * if no AUTH is yet included and this chunk requires it,
9597                  * make sure to account for it.  We don't apply the size
9598                  * until the AUTH chunk is actually added below in case
9599                  * there is no room for this chunk.
9600                  */
9601                 if (data_auth_reqd && (auth == NULL)) {
9602                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9603                 } else
9604                         dmtu = 0;
9605
9606                 if ((chk->send_size <= (mtu - dmtu)) ||
9607                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
9608                         /* ok we will add this one */
9609                         if (data_auth_reqd) {
9610                                 if (auth == NULL) {
9611                                         m = sctp_add_auth_chunk(m,
9612                                             &endofchain,
9613                                             &auth,
9614                                             &auth_offset,
9615                                             stcb,
9616                                             SCTP_DATA);
9617                                         auth_keyid = chk->auth_keyid;
9618                                         override_ok = 0;
9619                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9620                                 } else if (override_ok) {
9621                                         auth_keyid = chk->auth_keyid;
9622                                         override_ok = 0;
9623                                 } else if (chk->auth_keyid != auth_keyid) {
9624                                         /* different keyid, so done bundling */
9625                                         break;
9626                                 }
9627                         }
9628                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
9629                         if (m == NULL) {
9630                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9631                                 return (ENOMEM);
9632                         }
9633                         /* Do clear IP_DF ? */
9634                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9635                                 no_fragmentflg = 0;
9636                         }
9637                         /* upate our MTU size */
9638                         if (mtu > (chk->send_size + dmtu))
9639                                 mtu -= (chk->send_size + dmtu);
9640                         else
9641                                 mtu = 0;
9642                         data_list[bundle_at++] = chk;
9643                         if (one_chunk && (asoc->total_flight <= 0)) {
9644                                 SCTP_STAT_INCR(sctps_windowprobed);
9645                         }
9646                 }
9647                 if (one_chunk == 0) {
9648                         /*
9649                          * now are there anymore forward from chk to pick
9650                          * up?
9651                          */
9652                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
9653                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
9654                                         /* Nope, not for retran */
9655                                         continue;
9656                                 }
9657                                 if (fwd->whoTo != net) {
9658                                         /* Nope, not the net in question */
9659                                         continue;
9660                                 }
9661                                 if (data_auth_reqd && (auth == NULL)) {
9662                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
9663                                 } else
9664                                         dmtu = 0;
9665                                 if (fwd->send_size <= (mtu - dmtu)) {
9666                                         if (data_auth_reqd) {
9667                                                 if (auth == NULL) {
9668                                                         m = sctp_add_auth_chunk(m,
9669                                                             &endofchain,
9670                                                             &auth,
9671                                                             &auth_offset,
9672                                                             stcb,
9673                                                             SCTP_DATA);
9674                                                         auth_keyid = fwd->auth_keyid;
9675                                                         override_ok = 0;
9676                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
9677                                                 } else if (override_ok) {
9678                                                         auth_keyid = fwd->auth_keyid;
9679                                                         override_ok = 0;
9680                                                 } else if (fwd->auth_keyid != auth_keyid) {
9681                                                         /*
9682                                                          * different keyid,
9683                                                          * so done bundling
9684                                                          */
9685                                                         break;
9686                                                 }
9687                                         }
9688                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
9689                                         if (m == NULL) {
9690                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
9691                                                 return (ENOMEM);
9692                                         }
9693                                         /* Do clear IP_DF ? */
9694                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
9695                                                 no_fragmentflg = 0;
9696                                         }
9697                                         /* upate our MTU size */
9698                                         if (mtu > (fwd->send_size + dmtu))
9699                                                 mtu -= (fwd->send_size + dmtu);
9700                                         else
9701                                                 mtu = 0;
9702                                         data_list[bundle_at++] = fwd;
9703                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
9704                                                 break;
9705                                         }
9706                                 } else {
9707                                         /* can't fit so we are done */
9708                                         break;
9709                                 }
9710                         }
9711                 }
9712                 /* Is there something to send for this destination? */
9713                 if (m) {
9714                         /*
9715                          * No matter if we fail/or suceed we should start a
9716                          * timer. A failure is like a lost IP packet :-)
9717                          */
9718                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9719                                 /*
9720                                  * no timer running on this destination
9721                                  * restart it.
9722                                  */
9723                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9724                                 tmr_started = 1;
9725                         }
9726                         /* Now lets send it, if there is anything to send :> */
9727                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
9728                             (struct sockaddr *)&net->ro._l_addr, m,
9729                             auth_offset, auth, auth_keyid,
9730                             no_fragmentflg, 0, 0,
9731                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
9732                             net->port, NULL,
9733                             0, 0,
9734                             so_locked))) {
9735                                 /* error, we could not output */
9736                                 SCTP_STAT_INCR(sctps_lowlevelerr);
9737                                 return (error);
9738                         }
9739                         endofchain = NULL;
9740                         auth = NULL;
9741                         auth_offset = 0;
9742                         /* For HB's */
9743                         /*
9744                          * We don't want to mark the net->sent time here
9745                          * since this we use this for HB and retrans cannot
9746                          * measure RTT
9747                          */
9748                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
9749
9750                         /* For auto-close */
9751                         cnt_thru++;
9752                         if (*now_filled == 0) {
9753                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
9754                                 *now = asoc->time_last_sent;
9755                                 *now_filled = 1;
9756                         } else {
9757                                 asoc->time_last_sent = *now;
9758                         }
9759                         *cnt_out += bundle_at;
9760 #ifdef SCTP_AUDITING_ENABLED
9761                         sctp_audit_log(0xC4, bundle_at);
9762 #endif
9763                         if (bundle_at) {
9764                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
9765                         }
9766                         for (i = 0; i < bundle_at; i++) {
9767                                 SCTP_STAT_INCR(sctps_sendretransdata);
9768                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
9769                                 /*
9770                                  * When we have a revoked data, and we
9771                                  * retransmit it, then we clear the revoked
9772                                  * flag since this flag dictates if we
9773                                  * subtracted from the fs
9774                                  */
9775                                 if (data_list[i]->rec.data.chunk_was_revoked) {
9776                                         /* Deflate the cwnd */
9777                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
9778                                         data_list[i]->rec.data.chunk_was_revoked = 0;
9779                                 }
9780                                 data_list[i]->snd_count++;
9781                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
9782                                 /* record the time */
9783                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
9784                                 if (data_list[i]->book_size_scale) {
9785                                         /*
9786                                          * need to double the book size on
9787                                          * this one
9788                                          */
9789                                         data_list[i]->book_size_scale = 0;
9790                                         /*
9791                                          * Since we double the booksize, we
9792                                          * must also double the output queue
9793                                          * size, since this get shrunk when
9794                                          * we free by this amount.
9795                                          */
9796                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
9797                                         data_list[i]->book_size *= 2;
9798
9799
9800                                 } else {
9801                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
9802                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
9803                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
9804                                         }
9805                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
9806                                             (uint32_t) (data_list[i]->send_size +
9807                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
9808                                 }
9809                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
9810                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
9811                                             data_list[i]->whoTo->flight_size,
9812                                             data_list[i]->book_size,
9813                                             (uintptr_t) data_list[i]->whoTo,
9814                                             data_list[i]->rec.data.TSN_seq);
9815                                 }
9816                                 sctp_flight_size_increase(data_list[i]);
9817                                 sctp_total_flight_increase(stcb, data_list[i]);
9818                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
9819                                         /* SWS sender side engages */
9820                                         asoc->peers_rwnd = 0;
9821                                 }
9822                                 if ((i == 0) &&
9823                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
9824                                         SCTP_STAT_INCR(sctps_sendfastretrans);
9825                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
9826                                             (tmr_started == 0)) {
9827                                                 /*-
9828                                                  * ok we just fast-retrans'd
9829                                                  * the lowest TSN, i.e the
9830                                                  * first on the list. In
9831                                                  * this case we want to give
9832                                                  * some more time to get a
9833                                                  * SACK back without a
9834                                                  * t3-expiring.
9835                                                  */
9836                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
9837                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
9838                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
9839                                         }
9840                                 }
9841                         }
9842                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
9843                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
9844                         }
9845 #ifdef SCTP_AUDITING_ENABLED
9846                         sctp_auditing(21, inp, stcb, NULL);
9847 #endif
9848                 } else {
9849                         /* None will fit */
9850                         return (1);
9851                 }
9852                 if (asoc->sent_queue_retran_cnt <= 0) {
9853                         /* all done we have no more to retran */
9854                         asoc->sent_queue_retran_cnt = 0;
9855                         break;
9856                 }
9857                 if (one_chunk) {
9858                         /* No more room in rwnd */
9859                         return (1);
9860                 }
9861                 /* stop the for loop here. we sent out a packet */
9862                 break;
9863         }
9864         return (0);
9865 }
9866
9867 static void
9868 sctp_timer_validation(struct sctp_inpcb *inp,
9869     struct sctp_tcb *stcb,
9870     struct sctp_association *asoc)
9871 {
9872         struct sctp_nets *net;
9873
9874         /* Validate that a timer is running somewhere */
9875         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
9876                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
9877                         /* Here is a timer */
9878                         return;
9879                 }
9880         }
9881         SCTP_TCB_LOCK_ASSERT(stcb);
9882         /* Gak, we did not have a timer somewhere */
9883         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
9884         if (asoc->alternate) {
9885                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
9886         } else {
9887                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
9888         }
9889         return;
9890 }
9891
9892 void
9893 sctp_chunk_output(struct sctp_inpcb *inp,
9894     struct sctp_tcb *stcb,
9895     int from_where,
9896     int so_locked
9897 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
9898     SCTP_UNUSED
9899 #endif
9900 )
9901 {
9902         /*-
9903          * Ok this is the generic chunk service queue. we must do the
9904          * following:
9905          * - See if there are retransmits pending, if so we must
9906          *   do these first.
9907          * - Service the stream queue that is next, moving any
9908          *   message (note I must get a complete message i.e.
9909          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
9910          *   TSN's
9911          * - Check to see if the cwnd/rwnd allows any output, if so we
9912          *   go ahead and fomulate and send the low level chunks. Making sure
9913          *   to combine any control in the control chunk queue also.
9914          */
9915         struct sctp_association *asoc;
9916         struct sctp_nets *net;
9917         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0;
9918         unsigned int burst_cnt = 0;
9919         struct timeval now;
9920         int now_filled = 0;
9921         int nagle_on;
9922         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
9923         int un_sent = 0;
9924         int fr_done;
9925         unsigned int tot_frs = 0;
9926
9927         asoc = &stcb->asoc;
9928         /* The Nagle algorithm is only applied when handling a send call. */
9929         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
9930                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
9931                         nagle_on = 0;
9932                 } else {
9933                         nagle_on = 1;
9934                 }
9935         } else {
9936                 nagle_on = 0;
9937         }
9938         SCTP_TCB_LOCK_ASSERT(stcb);
9939
9940         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
9941
9942         if ((un_sent <= 0) &&
9943             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
9944             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
9945             (asoc->sent_queue_retran_cnt == 0)) {
9946                 /* Nothing to do unless there is something to be sent left */
9947                 return;
9948         }
9949         /*
9950          * Do we have something to send, data or control AND a sack timer
9951          * running, if so piggy-back the sack.
9952          */
9953         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
9954                 sctp_send_sack(stcb, so_locked);
9955                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
9956         }
9957         while (asoc->sent_queue_retran_cnt) {
9958                 /*-
9959                  * Ok, it is retransmission time only, we send out only ONE
9960                  * packet with a single call off to the retran code.
9961                  */
9962                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
9963                         /*-
9964                          * Special hook for handling cookiess discarded
9965                          * by peer that carried data. Send cookie-ack only
9966                          * and then the next call with get the retran's.
9967                          */
9968                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9969                             from_where,
9970                             &now, &now_filled, frag_point, so_locked);
9971                         return;
9972                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
9973                         /* if its not from a HB then do it */
9974                         fr_done = 0;
9975                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
9976                         if (fr_done) {
9977                                 tot_frs++;
9978                         }
9979                 } else {
9980                         /*
9981                          * its from any other place, we don't allow retran
9982                          * output (only control)
9983                          */
9984                         ret = 1;
9985                 }
9986                 if (ret > 0) {
9987                         /* Can't send anymore */
9988                         /*-
9989                          * now lets push out control by calling med-level
9990                          * output once. this assures that we WILL send HB's
9991                          * if queued too.
9992                          */
9993                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
9994                             from_where,
9995                             &now, &now_filled, frag_point, so_locked);
9996 #ifdef SCTP_AUDITING_ENABLED
9997                         sctp_auditing(8, inp, stcb, NULL);
9998 #endif
9999                         sctp_timer_validation(inp, stcb, asoc);
10000                         return;
10001                 }
10002                 if (ret < 0) {
10003                         /*-
10004                          * The count was off.. retran is not happening so do
10005                          * the normal retransmission.
10006                          */
10007 #ifdef SCTP_AUDITING_ENABLED
10008                         sctp_auditing(9, inp, stcb, NULL);
10009 #endif
10010                         if (ret == SCTP_RETRAN_EXIT) {
10011                                 return;
10012                         }
10013                         break;
10014                 }
10015                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10016                         /* Only one transmission allowed out of a timeout */
10017 #ifdef SCTP_AUDITING_ENABLED
10018                         sctp_auditing(10, inp, stcb, NULL);
10019 #endif
10020                         /* Push out any control */
10021                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10022                             &now, &now_filled, frag_point, so_locked);
10023                         return;
10024                 }
10025                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10026                         /* Hit FR burst limit */
10027                         return;
10028                 }
10029                 if ((num_out == 0) && (ret == 0)) {
10030                         /* No more retrans to send */
10031                         break;
10032                 }
10033         }
10034 #ifdef SCTP_AUDITING_ENABLED
10035         sctp_auditing(12, inp, stcb, NULL);
10036 #endif
10037         /* Check for bad destinations, if they exist move chunks around. */
10038         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10039                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10040                         /*-
10041                          * if possible move things off of this address we
10042                          * still may send below due to the dormant state but
10043                          * we try to find an alternate address to send to
10044                          * and if we have one we move all queued data on the
10045                          * out wheel to this alternate address.
10046                          */
10047                         if (net->ref_count > 1)
10048                                 sctp_move_chunks_from_net(stcb, net);
10049                 } else {
10050                         /*-
10051                          * if ((asoc->sat_network) || (net->addr_is_local))
10052                          * { burst_limit = asoc->max_burst *
10053                          * SCTP_SAT_NETWORK_BURST_INCR; }
10054                          */
10055                         if (asoc->max_burst > 0) {
10056                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10057                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10058                                                 /*
10059                                                  * JRS - Use the congestion
10060                                                  * control given in the
10061                                                  * congestion control module
10062                                                  */
10063                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10064                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10065                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10066                                                 }
10067                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10068                                         }
10069                                         net->fast_retran_ip = 0;
10070                                 } else {
10071                                         if (net->flight_size == 0) {
10072                                                 /*
10073                                                  * Should be decaying the
10074                                                  * cwnd here
10075                                                  */
10076                                                 ;
10077                                         }
10078                                 }
10079                         }
10080                 }
10081
10082         }
10083         burst_cnt = 0;
10084         do {
10085                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10086                     &reason_code, 0, from_where,
10087                     &now, &now_filled, frag_point, so_locked);
10088                 if (error) {
10089                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10090                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10091                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10092                         }
10093                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10094                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10095                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10096                         }
10097                         break;
10098                 }
10099                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10100
10101                 tot_out += num_out;
10102                 burst_cnt++;
10103                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10104                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10105                         if (num_out == 0) {
10106                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10107                         }
10108                 }
10109                 if (nagle_on) {
10110                         /*
10111                          * When the Nagle algorithm is used, look at how
10112                          * much is unsent, then if its smaller than an MTU
10113                          * and we have data in flight we stop, except if we
10114                          * are handling a fragmented user message.
10115                          */
10116                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10117                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10118                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10119                             (stcb->asoc.total_flight > 0) &&
10120                             ((stcb->asoc.locked_on_sending == NULL) ||
10121                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10122                                 break;
10123                         }
10124                 }
10125                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10126                     TAILQ_EMPTY(&asoc->send_queue) &&
10127                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10128                         /* Nothing left to send */
10129                         break;
10130                 }
10131                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10132                         /* Nothing left to send */
10133                         break;
10134                 }
10135         } while (num_out &&
10136             ((asoc->max_burst == 0) ||
10137             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10138             (burst_cnt < asoc->max_burst)));
10139
10140         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10141                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10142                         SCTP_STAT_INCR(sctps_maxburstqueued);
10143                         asoc->burst_limit_applied = 1;
10144                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10145                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10146                         }
10147                 } else {
10148                         asoc->burst_limit_applied = 0;
10149                 }
10150         }
10151         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10152                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10153         }
10154         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10155             tot_out);
10156
10157         /*-
10158          * Now we need to clean up the control chunk chain if a ECNE is on
10159          * it. It must be marked as UNSENT again so next call will continue
10160          * to send it until such time that we get a CWR, to remove it.
10161          */
10162         if (stcb->asoc.ecn_echo_cnt_onq)
10163                 sctp_fix_ecn_echo(asoc);
10164         return;
10165 }
10166
10167
10168 int
10169 sctp_output(
10170     struct sctp_inpcb *inp,
10171     struct mbuf *m,
10172     struct sockaddr *addr,
10173     struct mbuf *control,
10174     struct thread *p,
10175     int flags)
10176 {
10177         if (inp == NULL) {
10178                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10179                 return (EINVAL);
10180         }
10181         if (inp->sctp_socket == NULL) {
10182                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10183                 return (EINVAL);
10184         }
10185         return (sctp_sosend(inp->sctp_socket,
10186             addr,
10187             (struct uio *)NULL,
10188             m,
10189             control,
10190             flags, p
10191             ));
10192 }
10193
10194 void
10195 send_forward_tsn(struct sctp_tcb *stcb,
10196     struct sctp_association *asoc)
10197 {
10198         struct sctp_tmit_chunk *chk;
10199         struct sctp_forward_tsn_chunk *fwdtsn;
10200         uint32_t advance_peer_ack_point;
10201
10202         SCTP_TCB_LOCK_ASSERT(stcb);
10203         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10204                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10205                         /* mark it to unsent */
10206                         chk->sent = SCTP_DATAGRAM_UNSENT;
10207                         chk->snd_count = 0;
10208                         /* Do we correct its output location? */
10209                         if (chk->whoTo) {
10210                                 sctp_free_remote_addr(chk->whoTo);
10211                                 chk->whoTo = NULL;
10212                         }
10213                         goto sctp_fill_in_rest;
10214                 }
10215         }
10216         /* Ok if we reach here we must build one */
10217         sctp_alloc_a_chunk(stcb, chk);
10218         if (chk == NULL) {
10219                 return;
10220         }
10221         asoc->fwd_tsn_cnt++;
10222         chk->copy_by_ref = 0;
10223         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10224         chk->rec.chunk_id.can_take_data = 0;
10225         chk->asoc = asoc;
10226         chk->whoTo = NULL;
10227         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10228         if (chk->data == NULL) {
10229                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10230                 return;
10231         }
10232         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10233         chk->sent = SCTP_DATAGRAM_UNSENT;
10234         chk->snd_count = 0;
10235         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10236         asoc->ctrl_queue_cnt++;
10237 sctp_fill_in_rest:
10238         /*-
10239          * Here we go through and fill out the part that deals with
10240          * stream/seq of the ones we skip.
10241          */
10242         SCTP_BUF_LEN(chk->data) = 0;
10243         {
10244                 struct sctp_tmit_chunk *at, *tp1, *last;
10245                 struct sctp_strseq *strseq;
10246                 unsigned int cnt_of_space, i, ovh;
10247                 unsigned int space_needed;
10248                 unsigned int cnt_of_skipped = 0;
10249
10250                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10251                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
10252                                 /* no more to look at */
10253                                 break;
10254                         }
10255                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10256                                 /* We don't report these */
10257                                 continue;
10258                         }
10259                         cnt_of_skipped++;
10260                 }
10261                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10262                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10263
10264                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10265
10266                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10267                         ovh = SCTP_MIN_OVERHEAD;
10268                 } else {
10269                         ovh = SCTP_MIN_V4_OVERHEAD;
10270                 }
10271                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10272                         /* trim to a mtu size */
10273                         cnt_of_space = asoc->smallest_mtu - ovh;
10274                 }
10275                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10276                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10277                             0xff, 0, cnt_of_skipped,
10278                             asoc->advanced_peer_ack_point);
10279
10280                 }
10281                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10282                 if (cnt_of_space < space_needed) {
10283                         /*-
10284                          * ok we must trim down the chunk by lowering the
10285                          * advance peer ack point.
10286                          */
10287                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10288                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10289                                     0xff, 0xff, cnt_of_space,
10290                                     space_needed);
10291                         }
10292                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10293                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10294                         /*-
10295                          * Go through and find the TSN that will be the one
10296                          * we report.
10297                          */
10298                         at = TAILQ_FIRST(&asoc->sent_queue);
10299                         if (at != NULL) {
10300                                 for (i = 0; i < cnt_of_skipped; i++) {
10301                                         tp1 = TAILQ_NEXT(at, sctp_next);
10302                                         if (tp1 == NULL) {
10303                                                 break;
10304                                         }
10305                                         at = tp1;
10306                                 }
10307                         }
10308                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10309                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10310                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10311                                     asoc->advanced_peer_ack_point);
10312                         }
10313                         last = at;
10314                         /*-
10315                          * last now points to last one I can report, update
10316                          * peer ack point
10317                          */
10318                         if (last)
10319                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10320                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10321                             cnt_of_skipped * sizeof(struct sctp_strseq);
10322                 }
10323                 chk->send_size = space_needed;
10324                 /* Setup the chunk */
10325                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10326                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10327                 fwdtsn->ch.chunk_flags = 0;
10328                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10329                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10330                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10331                 fwdtsn++;
10332                 /*-
10333                  * Move pointer to after the fwdtsn and transfer to the
10334                  * strseq pointer.
10335                  */
10336                 strseq = (struct sctp_strseq *)fwdtsn;
10337                 /*-
10338                  * Now populate the strseq list. This is done blindly
10339                  * without pulling out duplicate stream info. This is
10340                  * inefficent but won't harm the process since the peer will
10341                  * look at these in sequence and will thus release anything.
10342                  * It could mean we exceed the PMTU and chop off some that
10343                  * we could have included.. but this is unlikely (aka 1432/4
10344                  * would mean 300+ stream seq's would have to be reported in
10345                  * one FWD-TSN. With a bit of work we can later FIX this to
10346                  * optimize and pull out duplcates.. but it does add more
10347                  * overhead. So for now... not!
10348                  */
10349                 at = TAILQ_FIRST(&asoc->sent_queue);
10350                 for (i = 0; i < cnt_of_skipped; i++) {
10351                         tp1 = TAILQ_NEXT(at, sctp_next);
10352                         if (tp1 == NULL)
10353                                 break;
10354                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10355                                 /* We don't report these */
10356                                 i--;
10357                                 at = tp1;
10358                                 continue;
10359                         }
10360                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10361                                 at->rec.data.fwd_tsn_cnt = 0;
10362                         }
10363                         strseq->stream = ntohs(at->rec.data.stream_number);
10364                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10365                         strseq++;
10366                         at = tp1;
10367                 }
10368         }
10369         return;
10370 }
10371
10372 void
10373 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10374 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10375     SCTP_UNUSED
10376 #endif
10377 )
10378 {
10379         /*-
10380          * Queue up a SACK or NR-SACK in the control queue.
10381          * We must first check to see if a SACK or NR-SACK is
10382          * somehow on the control queue.
10383          * If so, we will take and and remove the old one.
10384          */
10385         struct sctp_association *asoc;
10386         struct sctp_tmit_chunk *chk, *a_chk;
10387         struct sctp_sack_chunk *sack;
10388         struct sctp_nr_sack_chunk *nr_sack;
10389         struct sctp_gap_ack_block *gap_descriptor;
10390         struct sack_track *selector;
10391         int mergeable = 0;
10392         int offset;
10393         caddr_t limit;
10394         uint32_t *dup;
10395         int limit_reached = 0;
10396         unsigned int i, siz, j;
10397         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10398         int num_dups = 0;
10399         int space_req;
10400         uint32_t highest_tsn;
10401         uint8_t flags;
10402         uint8_t type;
10403         uint8_t tsn_map;
10404
10405         if ((stcb->asoc.sctp_nr_sack_on_off == 1) &&
10406             (stcb->asoc.peer_supports_nr_sack == 1)) {
10407                 type = SCTP_NR_SELECTIVE_ACK;
10408         } else {
10409                 type = SCTP_SELECTIVE_ACK;
10410         }
10411         a_chk = NULL;
10412         asoc = &stcb->asoc;
10413         SCTP_TCB_LOCK_ASSERT(stcb);
10414         if (asoc->last_data_chunk_from == NULL) {
10415                 /* Hmm we never received anything */
10416                 return;
10417         }
10418         sctp_slide_mapping_arrays(stcb);
10419         sctp_set_rwnd(stcb, asoc);
10420         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10421                 if (chk->rec.chunk_id.id == type) {
10422                         /* Hmm, found a sack already on queue, remove it */
10423                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10424                         asoc->ctrl_queue_cnt--;
10425                         a_chk = chk;
10426                         if (a_chk->data) {
10427                                 sctp_m_freem(a_chk->data);
10428                                 a_chk->data = NULL;
10429                         }
10430                         if (a_chk->whoTo) {
10431                                 sctp_free_remote_addr(a_chk->whoTo);
10432                                 a_chk->whoTo = NULL;
10433                         }
10434                         break;
10435                 }
10436         }
10437         if (a_chk == NULL) {
10438                 sctp_alloc_a_chunk(stcb, a_chk);
10439                 if (a_chk == NULL) {
10440                         /* No memory so we drop the idea, and set a timer */
10441                         if (stcb->asoc.delayed_ack) {
10442                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10443                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10444                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10445                                     stcb->sctp_ep, stcb, NULL);
10446                         } else {
10447                                 stcb->asoc.send_sack = 1;
10448                         }
10449                         return;
10450                 }
10451                 a_chk->copy_by_ref = 0;
10452                 a_chk->rec.chunk_id.id = type;
10453                 a_chk->rec.chunk_id.can_take_data = 1;
10454         }
10455         /* Clear our pkt counts */
10456         asoc->data_pkts_seen = 0;
10457
10458         a_chk->asoc = asoc;
10459         a_chk->snd_count = 0;
10460         a_chk->send_size = 0;   /* fill in later */
10461         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10462         a_chk->whoTo = NULL;
10463
10464         if ((asoc->numduptsns) ||
10465             (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
10466                 /*-
10467                  * Ok, we have some duplicates or the destination for the
10468                  * sack is unreachable, lets see if we can select an
10469                  * alternate than asoc->last_data_chunk_from
10470                  */
10471                 if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
10472                     (asoc->used_alt_onsack > asoc->numnets)) {
10473                         /* We used an alt last time, don't this time */
10474                         a_chk->whoTo = NULL;
10475                 } else {
10476                         asoc->used_alt_onsack++;
10477                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10478                 }
10479                 if (a_chk->whoTo == NULL) {
10480                         /* Nope, no alternate */
10481                         a_chk->whoTo = asoc->last_data_chunk_from;
10482                         asoc->used_alt_onsack = 0;
10483                 }
10484         } else {
10485                 /*
10486                  * No duplicates so we use the last place we received data
10487                  * from.
10488                  */
10489                 asoc->used_alt_onsack = 0;
10490                 a_chk->whoTo = asoc->last_data_chunk_from;
10491         }
10492         if (a_chk->whoTo) {
10493                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10494         }
10495         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10496                 highest_tsn = asoc->highest_tsn_inside_map;
10497         } else {
10498                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10499         }
10500         if (highest_tsn == asoc->cumulative_tsn) {
10501                 /* no gaps */
10502                 if (type == SCTP_SELECTIVE_ACK) {
10503                         space_req = sizeof(struct sctp_sack_chunk);
10504                 } else {
10505                         space_req = sizeof(struct sctp_nr_sack_chunk);
10506                 }
10507         } else {
10508                 /* gaps get a cluster */
10509                 space_req = MCLBYTES;
10510         }
10511         /* Ok now lets formulate a MBUF with our sack */
10512         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
10513         if ((a_chk->data == NULL) ||
10514             (a_chk->whoTo == NULL)) {
10515                 /* rats, no mbuf memory */
10516                 if (a_chk->data) {
10517                         /* was a problem with the destination */
10518                         sctp_m_freem(a_chk->data);
10519                         a_chk->data = NULL;
10520                 }
10521                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10522                 /* sa_ignore NO_NULL_CHK */
10523                 if (stcb->asoc.delayed_ack) {
10524                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10525                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
10526                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10527                             stcb->sctp_ep, stcb, NULL);
10528                 } else {
10529                         stcb->asoc.send_sack = 1;
10530                 }
10531                 return;
10532         }
10533         /* ok, lets go through and fill it in */
10534         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10535         space = M_TRAILINGSPACE(a_chk->data);
10536         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10537                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10538         }
10539         limit = mtod(a_chk->data, caddr_t);
10540         limit += space;
10541
10542         flags = 0;
10543
10544         if ((asoc->sctp_cmt_on_off > 0) &&
10545             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10546                 /*-
10547                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10548                  * received, then set high bit to 1, else 0. Reset
10549                  * pkts_rcvd.
10550                  */
10551                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10552                 asoc->cmt_dac_pkts_rcvd = 0;
10553         }
10554 #ifdef SCTP_ASOCLOG_OF_TSNS
10555         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10556         stcb->asoc.cumack_log_atsnt++;
10557         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10558                 stcb->asoc.cumack_log_atsnt = 0;
10559         }
10560 #endif
10561         /* reset the readers interpretation */
10562         stcb->freed_by_sorcv_sincelast = 0;
10563
10564         if (type == SCTP_SELECTIVE_ACK) {
10565                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10566                 nr_sack = NULL;
10567                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10568                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10569                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10570                 } else {
10571                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10572                 }
10573         } else {
10574                 sack = NULL;
10575                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10576                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10577                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10578                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10579                 } else {
10580                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10581                 }
10582         }
10583
10584         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10585                 offset = 1;
10586         } else {
10587                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10588         }
10589         if (((type == SCTP_SELECTIVE_ACK) &&
10590             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10591             ((type == SCTP_NR_SELECTIVE_ACK) &&
10592             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10593                 /* we have a gap .. maybe */
10594                 for (i = 0; i < siz; i++) {
10595                         tsn_map = asoc->mapping_array[i];
10596                         if (type == SCTP_SELECTIVE_ACK) {
10597                                 tsn_map |= asoc->nr_mapping_array[i];
10598                         }
10599                         if (i == 0) {
10600                                 /*
10601                                  * Clear all bits corresponding to TSNs
10602                                  * smaller or equal to the cumulative TSN.
10603                                  */
10604                                 tsn_map &= (~0 << (1 - offset));
10605                         }
10606                         selector = &sack_array[tsn_map];
10607                         if (mergeable && selector->right_edge) {
10608                                 /*
10609                                  * Backup, left and right edges were ok to
10610                                  * merge.
10611                                  */
10612                                 num_gap_blocks--;
10613                                 gap_descriptor--;
10614                         }
10615                         if (selector->num_entries == 0)
10616                                 mergeable = 0;
10617                         else {
10618                                 for (j = 0; j < selector->num_entries; j++) {
10619                                         if (mergeable && selector->right_edge) {
10620                                                 /*
10621                                                  * do a merge by NOT setting
10622                                                  * the left side
10623                                                  */
10624                                                 mergeable = 0;
10625                                         } else {
10626                                                 /*
10627                                                  * no merge, set the left
10628                                                  * side
10629                                                  */
10630                                                 mergeable = 0;
10631                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10632                                         }
10633                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10634                                         num_gap_blocks++;
10635                                         gap_descriptor++;
10636                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10637                                                 /* no more room */
10638                                                 limit_reached = 1;
10639                                                 break;
10640                                         }
10641                                 }
10642                                 if (selector->left_edge) {
10643                                         mergeable = 1;
10644                                 }
10645                         }
10646                         if (limit_reached) {
10647                                 /* Reached the limit stop */
10648                                 break;
10649                         }
10650                         offset += 8;
10651                 }
10652         }
10653         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10654             (limit_reached == 0)) {
10655
10656                 mergeable = 0;
10657
10658                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10659                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10660                 } else {
10661                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10662                 }
10663
10664                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10665                         offset = 1;
10666                 } else {
10667                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10668                 }
10669                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10670                         /* we have a gap .. maybe */
10671                         for (i = 0; i < siz; i++) {
10672                                 tsn_map = asoc->nr_mapping_array[i];
10673                                 if (i == 0) {
10674                                         /*
10675                                          * Clear all bits corresponding to
10676                                          * TSNs smaller or equal to the
10677                                          * cumulative TSN.
10678                                          */
10679                                         tsn_map &= (~0 << (1 - offset));
10680                                 }
10681                                 selector = &sack_array[tsn_map];
10682                                 if (mergeable && selector->right_edge) {
10683                                         /*
10684                                          * Backup, left and right edges were
10685                                          * ok to merge.
10686                                          */
10687                                         num_nr_gap_blocks--;
10688                                         gap_descriptor--;
10689                                 }
10690                                 if (selector->num_entries == 0)
10691                                         mergeable = 0;
10692                                 else {
10693                                         for (j = 0; j < selector->num_entries; j++) {
10694                                                 if (mergeable && selector->right_edge) {
10695                                                         /*
10696                                                          * do a merge by NOT
10697                                                          * setting the left
10698                                                          * side
10699                                                          */
10700                                                         mergeable = 0;
10701                                                 } else {
10702                                                         /*
10703                                                          * no merge, set the
10704                                                          * left side
10705                                                          */
10706                                                         mergeable = 0;
10707                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10708                                                 }
10709                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10710                                                 num_nr_gap_blocks++;
10711                                                 gap_descriptor++;
10712                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10713                                                         /* no more room */
10714                                                         limit_reached = 1;
10715                                                         break;
10716                                                 }
10717                                         }
10718                                         if (selector->left_edge) {
10719                                                 mergeable = 1;
10720                                         }
10721                                 }
10722                                 if (limit_reached) {
10723                                         /* Reached the limit stop */
10724                                         break;
10725                                 }
10726                                 offset += 8;
10727                         }
10728                 }
10729         }
10730         /* now we must add any dups we are going to report. */
10731         if ((limit_reached == 0) && (asoc->numduptsns)) {
10732                 dup = (uint32_t *) gap_descriptor;
10733                 for (i = 0; i < asoc->numduptsns; i++) {
10734                         *dup = htonl(asoc->dup_tsns[i]);
10735                         dup++;
10736                         num_dups++;
10737                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10738                                 /* no more room */
10739                                 break;
10740                         }
10741                 }
10742                 asoc->numduptsns = 0;
10743         }
10744         /*
10745          * now that the chunk is prepared queue it to the control chunk
10746          * queue.
10747          */
10748         if (type == SCTP_SELECTIVE_ACK) {
10749                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10750                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10751                     num_dups * sizeof(int32_t);
10752                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10753                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10754                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10755                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10756                 sack->sack.num_dup_tsns = htons(num_dups);
10757                 sack->ch.chunk_type = type;
10758                 sack->ch.chunk_flags = flags;
10759                 sack->ch.chunk_length = htons(a_chk->send_size);
10760         } else {
10761                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10762                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10763                     num_dups * sizeof(int32_t);
10764                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10765                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10766                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10767                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10768                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10769                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10770                 nr_sack->nr_sack.reserved = 0;
10771                 nr_sack->ch.chunk_type = type;
10772                 nr_sack->ch.chunk_flags = flags;
10773                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10774         }
10775         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10776         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10777         asoc->ctrl_queue_cnt++;
10778         asoc->send_sack = 0;
10779         SCTP_STAT_INCR(sctps_sendsacks);
10780         return;
10781 }
10782
10783 void
10784 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10785 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10786     SCTP_UNUSED
10787 #endif
10788 )
10789 {
10790         struct mbuf *m_abort;
10791         struct mbuf *m_out = NULL, *m_end = NULL;
10792         struct sctp_abort_chunk *abort = NULL;
10793         int sz;
10794         uint32_t auth_offset = 0;
10795         struct sctp_auth_chunk *auth = NULL;
10796         struct sctp_nets *net;
10797
10798         /*-
10799          * Add an AUTH chunk, if chunk requires it and save the offset into
10800          * the chain for AUTH
10801          */
10802         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10803             stcb->asoc.peer_auth_chunks)) {
10804                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
10805                     stcb, SCTP_ABORT_ASSOCIATION);
10806                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10807         }
10808         SCTP_TCB_LOCK_ASSERT(stcb);
10809         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10810         if (m_abort == NULL) {
10811                 /* no mbuf's */
10812                 if (m_out)
10813                         sctp_m_freem(m_out);
10814                 return;
10815         }
10816         /* link in any error */
10817         SCTP_BUF_NEXT(m_abort) = operr;
10818         sz = 0;
10819         if (operr) {
10820                 struct mbuf *n;
10821
10822                 n = operr;
10823                 while (n) {
10824                         sz += SCTP_BUF_LEN(n);
10825                         n = SCTP_BUF_NEXT(n);
10826                 }
10827         }
10828         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
10829         if (m_out == NULL) {
10830                 /* NO Auth chunk prepended, so reserve space in front */
10831                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10832                 m_out = m_abort;
10833         } else {
10834                 /* Put AUTH chunk at the front of the chain */
10835                 SCTP_BUF_NEXT(m_end) = m_abort;
10836         }
10837         if (stcb->asoc.alternate) {
10838                 net = stcb->asoc.alternate;
10839         } else {
10840                 net = stcb->asoc.primary_destination;
10841         }
10842         /* fill in the ABORT chunk */
10843         abort = mtod(m_abort, struct sctp_abort_chunk *);
10844         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10845         abort->ch.chunk_flags = 0;
10846         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
10847
10848         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10849             (struct sockaddr *)&net->ro._l_addr,
10850             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10851             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
10852             stcb->asoc.primary_destination->port, NULL,
10853             0, 0,
10854             so_locked);
10855         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10856 }
10857
10858 void
10859 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10860     struct sctp_nets *net,
10861     int reflect_vtag)
10862 {
10863         /* formulate and SEND a SHUTDOWN-COMPLETE */
10864         struct mbuf *m_shutdown_comp;
10865         struct sctp_shutdown_complete_chunk *shutdown_complete;
10866         uint32_t vtag;
10867         uint8_t flags;
10868
10869         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10870         if (m_shutdown_comp == NULL) {
10871                 /* no mbuf's */
10872                 return;
10873         }
10874         if (reflect_vtag) {
10875                 flags = SCTP_HAD_NO_TCB;
10876                 vtag = stcb->asoc.my_vtag;
10877         } else {
10878                 flags = 0;
10879                 vtag = stcb->asoc.peer_vtag;
10880         }
10881         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10882         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10883         shutdown_complete->ch.chunk_flags = flags;
10884         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10885         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10886         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10887             (struct sockaddr *)&net->ro._l_addr,
10888             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10889             stcb->sctp_ep->sctp_lport, stcb->rport,
10890             htonl(vtag),
10891             net->port, NULL,
10892             0, 0,
10893             SCTP_SO_NOT_LOCKED);
10894         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10895         return;
10896 }
10897
10898 static void
10899 sctp_send_resp_msg(struct mbuf *m, struct sctphdr *sh, uint32_t vtag,
10900     uint8_t type, struct mbuf *cause,
10901     uint8_t use_mflowid, uint32_t mflowid,
10902     uint32_t vrf_id, uint16_t port)
10903 {
10904         struct mbuf *o_pak;
10905         struct mbuf *mout;
10906         struct sctphdr *shout;
10907         struct sctp_chunkhdr *ch;
10908         struct ip *iph;
10909         struct udphdr *udp;
10910         int len, cause_len, padding_len, ret;
10911
10912 #ifdef INET
10913         sctp_route_t ro;
10914         struct ip *iph_out;
10915
10916 #endif
10917 #ifdef INET6
10918         struct ip6_hdr *ip6, *ip6_out;
10919
10920 #endif
10921
10922         /* Compute the length of the cause and add final padding. */
10923         cause_len = 0;
10924         if (cause != NULL) {
10925                 struct mbuf *m_at, *m_last = NULL;
10926
10927                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10928                         if (SCTP_BUF_NEXT(m_at) == NULL)
10929                                 m_last = m_at;
10930                         cause_len += SCTP_BUF_LEN(m_at);
10931                 }
10932                 padding_len = cause_len % 4;
10933                 if (padding_len != 0) {
10934                         padding_len = 4 - padding_len;
10935                 }
10936                 if (padding_len != 0) {
10937                         if (sctp_add_pad_tombuf(m_last, padding_len)) {
10938                                 sctp_m_freem(cause);
10939                                 return;
10940                         }
10941                 }
10942         } else {
10943                 padding_len = 0;
10944         }
10945         /* Get an mbuf for the header. */
10946         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
10947         iph = mtod(m, struct ip *);
10948         switch (iph->ip_v) {
10949 #ifdef INET
10950         case IPVERSION:
10951                 len += sizeof(struct ip);
10952                 break;
10953 #endif
10954 #ifdef INET6
10955         case IPV6_VERSION >> 4:
10956                 len += sizeof(struct ip6_hdr);
10957                 break;
10958 #endif
10959         default:
10960                 break;
10961         }
10962         if (port) {
10963                 len += sizeof(struct udphdr);
10964         }
10965         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_DONTWAIT, 1, MT_DATA);
10966         if (mout == NULL) {
10967                 if (cause) {
10968                         sctp_m_freem(cause);
10969                 }
10970                 return;
10971         }
10972         SCTP_BUF_RESV_UF(mout, max_linkhdr);
10973         SCTP_BUF_LEN(mout) = len;
10974         SCTP_BUF_NEXT(mout) = cause;
10975         if (use_mflowid != 0) {
10976                 mout->m_pkthdr.flowid = mflowid;
10977                 mout->m_flags |= M_FLOWID;
10978         }
10979 #ifdef INET
10980         iph_out = NULL;
10981 #endif
10982 #ifdef INET6
10983         ip6_out = NULL;
10984 #endif
10985         switch (iph->ip_v) {
10986 #ifdef INET
10987         case IPVERSION:
10988                 iph_out = mtod(mout, struct ip *);
10989                 iph_out->ip_v = IPVERSION;
10990                 iph_out->ip_hl = (sizeof(struct ip) >> 2);
10991                 iph_out->ip_tos = 0;
10992                 iph_out->ip_id = ip_newid();
10993                 iph_out->ip_off = 0;
10994                 iph_out->ip_ttl = MODULE_GLOBAL(ip_defttl);
10995                 if (port) {
10996                         iph_out->ip_p = IPPROTO_UDP;
10997                 } else {
10998                         iph_out->ip_p = IPPROTO_SCTP;
10999                 }
11000                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
11001                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
11002                 iph_out->ip_sum = 0;
11003                 len = sizeof(struct ip);
11004                 shout = (struct sctphdr *)((caddr_t)iph_out + len);
11005                 break;
11006 #endif
11007 #ifdef INET6
11008         case IPV6_VERSION >> 4:
11009                 ip6 = (struct ip6_hdr *)iph;
11010                 ip6_out = mtod(mout, struct ip6_hdr *);
11011                 ip6_out->ip6_flow = htonl(0x60000000);
11012                 if (V_ip6_auto_flowlabel) {
11013                         ip6_out->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11014                 }
11015                 ip6_out->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11016                 if (port) {
11017                         ip6_out->ip6_nxt = IPPROTO_UDP;
11018                 } else {
11019                         ip6_out->ip6_nxt = IPPROTO_SCTP;
11020                 }
11021                 ip6_out->ip6_src = ip6->ip6_dst;
11022                 ip6_out->ip6_dst = ip6->ip6_src;
11023                 len = sizeof(struct ip6_hdr);
11024                 shout = (struct sctphdr *)((caddr_t)ip6_out + len);
11025                 break;
11026 #endif
11027         default:
11028                 len = 0;
11029                 shout = mtod(mout, struct sctphdr *);
11030                 break;
11031         }
11032         if (port) {
11033                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11034                         sctp_m_freem(mout);
11035                         return;
11036                 }
11037                 udp = (struct udphdr *)shout;
11038                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11039                 udp->uh_dport = port;
11040                 udp->uh_sum = 0;
11041                 udp->uh_ulen = htons(sizeof(struct udphdr) +
11042                     sizeof(struct sctphdr) +
11043                     sizeof(struct sctp_chunkhdr) +
11044                     cause_len + padding_len);
11045                 len += sizeof(struct udphdr);
11046                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11047         } else {
11048                 udp = NULL;
11049         }
11050         shout->src_port = sh->dest_port;
11051         shout->dest_port = sh->src_port;
11052         shout->checksum = 0;
11053         if (vtag) {
11054                 shout->v_tag = htonl(vtag);
11055         } else {
11056                 shout->v_tag = sh->v_tag;
11057         }
11058         len += sizeof(struct sctphdr);
11059         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11060         ch->chunk_type = type;
11061         if (vtag) {
11062                 ch->chunk_flags = 0;
11063         } else {
11064                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11065         }
11066         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11067         len += sizeof(struct sctp_chunkhdr);
11068         len += cause_len + padding_len;
11069
11070         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11071                 sctp_m_freem(mout);
11072                 return;
11073         }
11074         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11075 #ifdef INET
11076         if (iph_out != NULL) {
11077                 /* zap the stack pointer to the route */
11078                 bzero(&ro, sizeof(sctp_route_t));
11079                 if (port) {
11080                         if (V_udp_cksum) {
11081                                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11082                         } else {
11083                                 udp->uh_sum = 0;
11084                         }
11085                 }
11086                 iph_out->ip_len = len;
11087 #ifdef SCTP_PACKET_LOGGING
11088                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11089                         sctp_packet_log(mout, len);
11090                 }
11091 #endif
11092                 if (port) {
11093 #if defined(SCTP_WITH_NO_CSUM)
11094                         SCTP_STAT_INCR(sctps_sendnocrc);
11095 #else
11096                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11097                         SCTP_STAT_INCR(sctps_sendswcrc);
11098 #endif
11099                         if (V_udp_cksum) {
11100                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11101                         }
11102                 } else {
11103 #if defined(SCTP_WITH_NO_CSUM)
11104                         SCTP_STAT_INCR(sctps_sendnocrc);
11105 #else
11106                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11107                         mout->m_pkthdr.csum_data = 0;
11108                         SCTP_STAT_INCR(sctps_sendhwcrc);
11109 #endif
11110                 }
11111                 SCTP_IP_OUTPUT(ret, o_pak, &ro, NULL, vrf_id);
11112                 /* Free the route if we got one back */
11113                 if (ro.ro_rt) {
11114                         RTFREE(ro.ro_rt);
11115                 }
11116         }
11117 #endif
11118 #ifdef INET6
11119         if (ip6_out != NULL) {
11120                 ip6_out->ip6_plen = len - sizeof(struct ip6_hdr);
11121 #ifdef  SCTP_PACKET_LOGGING
11122                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11123                         sctp_packet_log(mout, len);
11124                 }
11125 #endif
11126                 if (port) {
11127 #if defined(SCTP_WITH_NO_CSUM)
11128                         SCTP_STAT_INCR(sctps_sendnocrc);
11129 #else
11130                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11131                         SCTP_STAT_INCR(sctps_sendswcrc);
11132 #endif
11133                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11134                                 udp->uh_sum = 0xffff;
11135                         }
11136                 } else {
11137 #if defined(SCTP_WITH_NO_CSUM)
11138                         SCTP_STAT_INCR(sctps_sendnocrc);
11139 #else
11140                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11141                         mout->m_pkthdr.csum_data = 0;
11142                         SCTP_STAT_INCR(sctps_sendhwcrc);
11143 #endif
11144                 }
11145                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11146         }
11147 #endif
11148         SCTP_STAT_INCR(sctps_sendpackets);
11149         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11150         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11151         return;
11152 }
11153
11154 void
11155 sctp_send_shutdown_complete2(struct mbuf *m, struct sctphdr *sh,
11156     uint8_t use_mflowid, uint32_t mflowid,
11157     uint32_t vrf_id, uint16_t port)
11158 {
11159         sctp_send_resp_msg(m, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11160             use_mflowid, mflowid,
11161             vrf_id, port);
11162 }
11163
11164 void
11165 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11166 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11167     SCTP_UNUSED
11168 #endif
11169 )
11170 {
11171         struct sctp_tmit_chunk *chk;
11172         struct sctp_heartbeat_chunk *hb;
11173         struct timeval now;
11174
11175         SCTP_TCB_LOCK_ASSERT(stcb);
11176         if (net == NULL) {
11177                 return;
11178         }
11179         (void)SCTP_GETTIME_TIMEVAL(&now);
11180         switch (net->ro._l_addr.sa.sa_family) {
11181 #ifdef INET
11182         case AF_INET:
11183                 break;
11184 #endif
11185 #ifdef INET6
11186         case AF_INET6:
11187                 break;
11188 #endif
11189         default:
11190                 return;
11191         }
11192         sctp_alloc_a_chunk(stcb, chk);
11193         if (chk == NULL) {
11194                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11195                 return;
11196         }
11197         chk->copy_by_ref = 0;
11198         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11199         chk->rec.chunk_id.can_take_data = 1;
11200         chk->asoc = &stcb->asoc;
11201         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11202
11203         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11204         if (chk->data == NULL) {
11205                 sctp_free_a_chunk(stcb, chk, so_locked);
11206                 return;
11207         }
11208         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11209         SCTP_BUF_LEN(chk->data) = chk->send_size;
11210         chk->sent = SCTP_DATAGRAM_UNSENT;
11211         chk->snd_count = 0;
11212         chk->whoTo = net;
11213         atomic_add_int(&chk->whoTo->ref_count, 1);
11214         /* Now we have a mbuf that we can fill in with the details */
11215         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11216         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11217         /* fill out chunk header */
11218         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11219         hb->ch.chunk_flags = 0;
11220         hb->ch.chunk_length = htons(chk->send_size);
11221         /* Fill out hb parameter */
11222         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11223         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11224         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11225         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11226         /* Did our user request this one, put it in */
11227         hb->heartbeat.hb_info.addr_family = net->ro._l_addr.sa.sa_family;
11228         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11229         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11230                 /*
11231                  * we only take from the entropy pool if the address is not
11232                  * confirmed.
11233                  */
11234                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11235                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11236         } else {
11237                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11238                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11239         }
11240         switch (net->ro._l_addr.sa.sa_family) {
11241 #ifdef INET
11242         case AF_INET:
11243                 memcpy(hb->heartbeat.hb_info.address,
11244                     &net->ro._l_addr.sin.sin_addr,
11245                     sizeof(net->ro._l_addr.sin.sin_addr));
11246                 break;
11247 #endif
11248 #ifdef INET6
11249         case AF_INET6:
11250                 memcpy(hb->heartbeat.hb_info.address,
11251                     &net->ro._l_addr.sin6.sin6_addr,
11252                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11253                 break;
11254 #endif
11255         default:
11256                 return;
11257                 break;
11258         }
11259         net->hb_responded = 0;
11260         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11261         stcb->asoc.ctrl_queue_cnt++;
11262         SCTP_STAT_INCR(sctps_sendheartbeat);
11263         return;
11264 }
11265
11266 void
11267 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11268     uint32_t high_tsn)
11269 {
11270         struct sctp_association *asoc;
11271         struct sctp_ecne_chunk *ecne;
11272         struct sctp_tmit_chunk *chk;
11273
11274         if (net == NULL) {
11275                 return;
11276         }
11277         asoc = &stcb->asoc;
11278         SCTP_TCB_LOCK_ASSERT(stcb);
11279         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11280                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11281                         /* found a previous ECN_ECHO update it if needed */
11282                         uint32_t cnt, ctsn;
11283
11284                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11285                         ctsn = ntohl(ecne->tsn);
11286                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11287                                 ecne->tsn = htonl(high_tsn);
11288                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11289                         }
11290                         cnt = ntohl(ecne->num_pkts_since_cwr);
11291                         cnt++;
11292                         ecne->num_pkts_since_cwr = htonl(cnt);
11293                         return;
11294                 }
11295         }
11296         /* nope could not find one to update so we must build one */
11297         sctp_alloc_a_chunk(stcb, chk);
11298         if (chk == NULL) {
11299                 return;
11300         }
11301         chk->copy_by_ref = 0;
11302         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11303         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11304         chk->rec.chunk_id.can_take_data = 0;
11305         chk->asoc = &stcb->asoc;
11306         chk->send_size = sizeof(struct sctp_ecne_chunk);
11307         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11308         if (chk->data == NULL) {
11309                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11310                 return;
11311         }
11312         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11313         SCTP_BUF_LEN(chk->data) = chk->send_size;
11314         chk->sent = SCTP_DATAGRAM_UNSENT;
11315         chk->snd_count = 0;
11316         chk->whoTo = net;
11317         atomic_add_int(&chk->whoTo->ref_count, 1);
11318
11319         stcb->asoc.ecn_echo_cnt_onq++;
11320         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11321         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11322         ecne->ch.chunk_flags = 0;
11323         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11324         ecne->tsn = htonl(high_tsn);
11325         ecne->num_pkts_since_cwr = htonl(1);
11326         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11327         asoc->ctrl_queue_cnt++;
11328 }
11329
11330 void
11331 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11332     struct mbuf *m, int iphlen, int bad_crc)
11333 {
11334         struct sctp_association *asoc;
11335         struct sctp_pktdrop_chunk *drp;
11336         struct sctp_tmit_chunk *chk;
11337         uint8_t *datap;
11338         int len;
11339         int was_trunc = 0;
11340         struct ip *iph;
11341
11342 #ifdef INET6
11343         struct ip6_hdr *ip6h;
11344
11345 #endif
11346         int fullsz = 0, extra = 0;
11347         long spc;
11348         int offset;
11349         struct sctp_chunkhdr *ch, chunk_buf;
11350         unsigned int chk_length;
11351
11352         if (!stcb) {
11353                 return;
11354         }
11355         asoc = &stcb->asoc;
11356         SCTP_TCB_LOCK_ASSERT(stcb);
11357         if (asoc->peer_supports_pktdrop == 0) {
11358                 /*-
11359                  * peer must declare support before I send one.
11360                  */
11361                 return;
11362         }
11363         if (stcb->sctp_socket == NULL) {
11364                 return;
11365         }
11366         sctp_alloc_a_chunk(stcb, chk);
11367         if (chk == NULL) {
11368                 return;
11369         }
11370         chk->copy_by_ref = 0;
11371         iph = mtod(m, struct ip *);
11372         if (iph == NULL) {
11373                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11374                 return;
11375         }
11376         switch (iph->ip_v) {
11377 #ifdef INET
11378         case IPVERSION:
11379                 /* IPv4 */
11380                 len = chk->send_size = iph->ip_len;
11381                 break;
11382 #endif
11383 #ifdef INET6
11384         case IPV6_VERSION >> 4:
11385                 /* IPv6 */
11386                 ip6h = mtod(m, struct ip6_hdr *);
11387                 len = chk->send_size = htons(ip6h->ip6_plen);
11388                 break;
11389 #endif
11390         default:
11391                 return;
11392         }
11393         /* Validate that we do not have an ABORT in here. */
11394         offset = iphlen + sizeof(struct sctphdr);
11395         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11396             sizeof(*ch), (uint8_t *) & chunk_buf);
11397         while (ch != NULL) {
11398                 chk_length = ntohs(ch->chunk_length);
11399                 if (chk_length < sizeof(*ch)) {
11400                         /* break to abort land */
11401                         break;
11402                 }
11403                 switch (ch->chunk_type) {
11404                 case SCTP_PACKET_DROPPED:
11405                 case SCTP_ABORT_ASSOCIATION:
11406                 case SCTP_INITIATION_ACK:
11407                         /**
11408                          * We don't respond with an PKT-DROP to an ABORT
11409                          * or PKT-DROP. We also do not respond to an
11410                          * INIT-ACK, because we can't know if the initiation
11411                          * tag is correct or not.
11412                          */
11413                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11414                         return;
11415                 default:
11416                         break;
11417                 }
11418                 offset += SCTP_SIZE32(chk_length);
11419                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11420                     sizeof(*ch), (uint8_t *) & chunk_buf);
11421         }
11422
11423         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11424             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11425                 /*
11426                  * only send 1 mtu worth, trim off the excess on the end.
11427                  */
11428                 fullsz = len - extra;
11429                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11430                 was_trunc = 1;
11431         }
11432         chk->asoc = &stcb->asoc;
11433         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11434         if (chk->data == NULL) {
11435 jump_out:
11436                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11437                 return;
11438         }
11439         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11440         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11441         if (drp == NULL) {
11442                 sctp_m_freem(chk->data);
11443                 chk->data = NULL;
11444                 goto jump_out;
11445         }
11446         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11447             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11448         chk->book_size_scale = 0;
11449         if (was_trunc) {
11450                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11451                 drp->trunc_len = htons(fullsz);
11452                 /*
11453                  * Len is already adjusted to size minus overhead above take
11454                  * out the pkt_drop chunk itself from it.
11455                  */
11456                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11457                 len = chk->send_size;
11458         } else {
11459                 /* no truncation needed */
11460                 drp->ch.chunk_flags = 0;
11461                 drp->trunc_len = htons(0);
11462         }
11463         if (bad_crc) {
11464                 drp->ch.chunk_flags |= SCTP_BADCRC;
11465         }
11466         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11467         SCTP_BUF_LEN(chk->data) = chk->send_size;
11468         chk->sent = SCTP_DATAGRAM_UNSENT;
11469         chk->snd_count = 0;
11470         if (net) {
11471                 /* we should hit here */
11472                 chk->whoTo = net;
11473                 atomic_add_int(&chk->whoTo->ref_count, 1);
11474         } else {
11475                 chk->whoTo = NULL;
11476         }
11477         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11478         chk->rec.chunk_id.can_take_data = 1;
11479         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11480         drp->ch.chunk_length = htons(chk->send_size);
11481         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11482         if (spc < 0) {
11483                 spc = 0;
11484         }
11485         drp->bottle_bw = htonl(spc);
11486         if (asoc->my_rwnd) {
11487                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11488                     asoc->size_on_all_streams +
11489                     asoc->my_rwnd_control_len +
11490                     stcb->sctp_socket->so_rcv.sb_cc);
11491         } else {
11492                 /*-
11493                  * If my rwnd is 0, possibly from mbuf depletion as well as
11494                  * space used, tell the peer there is NO space aka onq == bw
11495                  */
11496                 drp->current_onq = htonl(spc);
11497         }
11498         drp->reserved = 0;
11499         datap = drp->data;
11500         m_copydata(m, iphlen, len, (caddr_t)datap);
11501         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11502         asoc->ctrl_queue_cnt++;
11503 }
11504
11505 void
11506 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11507 {
11508         struct sctp_association *asoc;
11509         struct sctp_cwr_chunk *cwr;
11510         struct sctp_tmit_chunk *chk;
11511
11512         asoc = &stcb->asoc;
11513         SCTP_TCB_LOCK_ASSERT(stcb);
11514         if (net == NULL) {
11515                 return;
11516         }
11517         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11518                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11519                         /*
11520                          * found a previous CWR queued to same destination
11521                          * update it if needed
11522                          */
11523                         uint32_t ctsn;
11524
11525                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11526                         ctsn = ntohl(cwr->tsn);
11527                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11528                                 cwr->tsn = htonl(high_tsn);
11529                         }
11530                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11531                                 /* Make sure override is carried */
11532                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11533                         }
11534                         return;
11535                 }
11536         }
11537         sctp_alloc_a_chunk(stcb, chk);
11538         if (chk == NULL) {
11539                 return;
11540         }
11541         chk->copy_by_ref = 0;
11542         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11543         chk->rec.chunk_id.can_take_data = 1;
11544         chk->asoc = &stcb->asoc;
11545         chk->send_size = sizeof(struct sctp_cwr_chunk);
11546         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
11547         if (chk->data == NULL) {
11548                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11549                 return;
11550         }
11551         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11552         SCTP_BUF_LEN(chk->data) = chk->send_size;
11553         chk->sent = SCTP_DATAGRAM_UNSENT;
11554         chk->snd_count = 0;
11555         chk->whoTo = net;
11556         atomic_add_int(&chk->whoTo->ref_count, 1);
11557         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11558         cwr->ch.chunk_type = SCTP_ECN_CWR;
11559         cwr->ch.chunk_flags = override;
11560         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11561         cwr->tsn = htonl(high_tsn);
11562         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11563         asoc->ctrl_queue_cnt++;
11564 }
11565
11566 void
11567 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
11568     int number_entries, uint16_t * list,
11569     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11570 {
11571         int len, old_len, i;
11572         struct sctp_stream_reset_out_request *req_out;
11573         struct sctp_chunkhdr *ch;
11574
11575         ch = mtod(chk->data, struct sctp_chunkhdr *);
11576
11577
11578         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11579
11580         /* get to new offset for the param. */
11581         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11582         /* now how long will this param be? */
11583         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11584         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11585         req_out->ph.param_length = htons(len);
11586         req_out->request_seq = htonl(seq);
11587         req_out->response_seq = htonl(resp_seq);
11588         req_out->send_reset_at_tsn = htonl(last_sent);
11589         if (number_entries) {
11590                 for (i = 0; i < number_entries; i++) {
11591                         req_out->list_of_streams[i] = htons(list[i]);
11592                 }
11593         }
11594         if (SCTP_SIZE32(len) > len) {
11595                 /*-
11596                  * Need to worry about the pad we may end up adding to the
11597                  * end. This is easy since the struct is either aligned to 4
11598                  * bytes or 2 bytes off.
11599                  */
11600                 req_out->list_of_streams[number_entries] = 0;
11601         }
11602         /* now fix the chunk length */
11603         ch->chunk_length = htons(len + old_len);
11604         chk->book_size = len + old_len;
11605         chk->book_size_scale = 0;
11606         chk->send_size = SCTP_SIZE32(chk->book_size);
11607         SCTP_BUF_LEN(chk->data) = chk->send_size;
11608         return;
11609 }
11610
11611
11612 void
11613 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11614     int number_entries, uint16_t * list,
11615     uint32_t seq)
11616 {
11617         int len, old_len, i;
11618         struct sctp_stream_reset_in_request *req_in;
11619         struct sctp_chunkhdr *ch;
11620
11621         ch = mtod(chk->data, struct sctp_chunkhdr *);
11622
11623
11624         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11625
11626         /* get to new offset for the param. */
11627         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11628         /* now how long will this param be? */
11629         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11630         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11631         req_in->ph.param_length = htons(len);
11632         req_in->request_seq = htonl(seq);
11633         if (number_entries) {
11634                 for (i = 0; i < number_entries; i++) {
11635                         req_in->list_of_streams[i] = htons(list[i]);
11636                 }
11637         }
11638         if (SCTP_SIZE32(len) > len) {
11639                 /*-
11640                  * Need to worry about the pad we may end up adding to the
11641                  * end. This is easy since the struct is either aligned to 4
11642                  * bytes or 2 bytes off.
11643                  */
11644                 req_in->list_of_streams[number_entries] = 0;
11645         }
11646         /* now fix the chunk length */
11647         ch->chunk_length = htons(len + old_len);
11648         chk->book_size = len + old_len;
11649         chk->book_size_scale = 0;
11650         chk->send_size = SCTP_SIZE32(chk->book_size);
11651         SCTP_BUF_LEN(chk->data) = chk->send_size;
11652         return;
11653 }
11654
11655
11656 void
11657 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11658     uint32_t seq)
11659 {
11660         int len, old_len;
11661         struct sctp_stream_reset_tsn_request *req_tsn;
11662         struct sctp_chunkhdr *ch;
11663
11664         ch = mtod(chk->data, struct sctp_chunkhdr *);
11665
11666
11667         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11668
11669         /* get to new offset for the param. */
11670         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11671         /* now how long will this param be? */
11672         len = sizeof(struct sctp_stream_reset_tsn_request);
11673         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11674         req_tsn->ph.param_length = htons(len);
11675         req_tsn->request_seq = htonl(seq);
11676
11677         /* now fix the chunk length */
11678         ch->chunk_length = htons(len + old_len);
11679         chk->send_size = len + old_len;
11680         chk->book_size = SCTP_SIZE32(chk->send_size);
11681         chk->book_size_scale = 0;
11682         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11683         return;
11684 }
11685
11686 void
11687 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11688     uint32_t resp_seq, uint32_t result)
11689 {
11690         int len, old_len;
11691         struct sctp_stream_reset_response *resp;
11692         struct sctp_chunkhdr *ch;
11693
11694         ch = mtod(chk->data, struct sctp_chunkhdr *);
11695
11696
11697         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11698
11699         /* get to new offset for the param. */
11700         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11701         /* now how long will this param be? */
11702         len = sizeof(struct sctp_stream_reset_response);
11703         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11704         resp->ph.param_length = htons(len);
11705         resp->response_seq = htonl(resp_seq);
11706         resp->result = ntohl(result);
11707
11708         /* now fix the chunk length */
11709         ch->chunk_length = htons(len + old_len);
11710         chk->book_size = len + old_len;
11711         chk->book_size_scale = 0;
11712         chk->send_size = SCTP_SIZE32(chk->book_size);
11713         SCTP_BUF_LEN(chk->data) = chk->send_size;
11714         return;
11715
11716 }
11717
11718
11719 void
11720 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11721     uint32_t resp_seq, uint32_t result,
11722     uint32_t send_una, uint32_t recv_next)
11723 {
11724         int len, old_len;
11725         struct sctp_stream_reset_response_tsn *resp;
11726         struct sctp_chunkhdr *ch;
11727
11728         ch = mtod(chk->data, struct sctp_chunkhdr *);
11729
11730
11731         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11732
11733         /* get to new offset for the param. */
11734         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11735         /* now how long will this param be? */
11736         len = sizeof(struct sctp_stream_reset_response_tsn);
11737         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11738         resp->ph.param_length = htons(len);
11739         resp->response_seq = htonl(resp_seq);
11740         resp->result = htonl(result);
11741         resp->senders_next_tsn = htonl(send_una);
11742         resp->receivers_next_tsn = htonl(recv_next);
11743
11744         /* now fix the chunk length */
11745         ch->chunk_length = htons(len + old_len);
11746         chk->book_size = len + old_len;
11747         chk->send_size = SCTP_SIZE32(chk->book_size);
11748         chk->book_size_scale = 0;
11749         SCTP_BUF_LEN(chk->data) = chk->send_size;
11750         return;
11751 }
11752
11753 static void
11754 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11755     uint32_t seq,
11756     uint16_t adding)
11757 {
11758         int len, old_len;
11759         struct sctp_chunkhdr *ch;
11760         struct sctp_stream_reset_add_strm *addstr;
11761
11762         ch = mtod(chk->data, struct sctp_chunkhdr *);
11763         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11764
11765         /* get to new offset for the param. */
11766         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11767         /* now how long will this param be? */
11768         len = sizeof(struct sctp_stream_reset_add_strm);
11769
11770         /* Fill it out. */
11771         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11772         addstr->ph.param_length = htons(len);
11773         addstr->request_seq = htonl(seq);
11774         addstr->number_of_streams = htons(adding);
11775         addstr->reserved = 0;
11776
11777         /* now fix the chunk length */
11778         ch->chunk_length = htons(len + old_len);
11779         chk->send_size = len + old_len;
11780         chk->book_size = SCTP_SIZE32(chk->send_size);
11781         chk->book_size_scale = 0;
11782         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11783         return;
11784 }
11785
11786 static void
11787 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11788     uint32_t seq,
11789     uint16_t adding)
11790 {
11791         int len, old_len;
11792         struct sctp_chunkhdr *ch;
11793         struct sctp_stream_reset_add_strm *addstr;
11794
11795         ch = mtod(chk->data, struct sctp_chunkhdr *);
11796         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11797
11798         /* get to new offset for the param. */
11799         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11800         /* now how long will this param be? */
11801         len = sizeof(struct sctp_stream_reset_add_strm);
11802         /* Fill it out. */
11803         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11804         addstr->ph.param_length = htons(len);
11805         addstr->request_seq = htonl(seq);
11806         addstr->number_of_streams = htons(adding);
11807         addstr->reserved = 0;
11808
11809         /* now fix the chunk length */
11810         ch->chunk_length = htons(len + old_len);
11811         chk->send_size = len + old_len;
11812         chk->book_size = SCTP_SIZE32(chk->send_size);
11813         chk->book_size_scale = 0;
11814         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11815         return;
11816 }
11817
11818
11819
11820 int
11821 sctp_send_str_reset_req(struct sctp_tcb *stcb,
11822     int number_entries, uint16_t * list,
11823     uint8_t send_out_req,
11824     uint8_t send_in_req,
11825     uint8_t send_tsn_req,
11826     uint8_t add_stream,
11827     uint16_t adding_o,
11828     uint16_t adding_i, uint8_t peer_asked
11829 )
11830 {
11831
11832         struct sctp_association *asoc;
11833         struct sctp_tmit_chunk *chk;
11834         struct sctp_chunkhdr *ch;
11835         uint32_t seq;
11836
11837         asoc = &stcb->asoc;
11838         if (asoc->stream_reset_outstanding) {
11839                 /*-
11840                  * Already one pending, must get ACK back to clear the flag.
11841                  */
11842                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
11843                 return (EBUSY);
11844         }
11845         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0) &&
11846             (add_stream == 0)) {
11847                 /* nothing to do */
11848                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11849                 return (EINVAL);
11850         }
11851         if (send_tsn_req && (send_out_req || send_in_req)) {
11852                 /* error, can't do that */
11853                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11854                 return (EINVAL);
11855         }
11856         sctp_alloc_a_chunk(stcb, chk);
11857         if (chk == NULL) {
11858                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11859                 return (ENOMEM);
11860         }
11861         chk->copy_by_ref = 0;
11862         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11863         chk->rec.chunk_id.can_take_data = 0;
11864         chk->asoc = &stcb->asoc;
11865         chk->book_size = sizeof(struct sctp_chunkhdr);
11866         chk->send_size = SCTP_SIZE32(chk->book_size);
11867         chk->book_size_scale = 0;
11868
11869         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11870         if (chk->data == NULL) {
11871                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11872                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11873                 return (ENOMEM);
11874         }
11875         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11876
11877         /* setup chunk parameters */
11878         chk->sent = SCTP_DATAGRAM_UNSENT;
11879         chk->snd_count = 0;
11880         if (stcb->asoc.alternate) {
11881                 chk->whoTo = stcb->asoc.alternate;
11882         } else {
11883                 chk->whoTo = stcb->asoc.primary_destination;
11884         }
11885         atomic_add_int(&chk->whoTo->ref_count, 1);
11886         ch = mtod(chk->data, struct sctp_chunkhdr *);
11887         ch->chunk_type = SCTP_STREAM_RESET;
11888         ch->chunk_flags = 0;
11889         ch->chunk_length = htons(chk->book_size);
11890         SCTP_BUF_LEN(chk->data) = chk->send_size;
11891
11892         seq = stcb->asoc.str_reset_seq_out;
11893         if (send_out_req) {
11894                 sctp_add_stream_reset_out(chk, number_entries, list,
11895                     seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
11896                 asoc->stream_reset_out_is_outstanding = 1;
11897                 seq++;
11898                 asoc->stream_reset_outstanding++;
11899         }
11900         if ((add_stream & 1) &&
11901             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
11902                 /* Need to allocate more */
11903                 struct sctp_stream_out *oldstream;
11904                 struct sctp_stream_queue_pending *sp, *nsp;
11905                 int i;
11906
11907                 oldstream = stcb->asoc.strmout;
11908                 /* get some more */
11909                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
11910                     ((stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out)),
11911                     SCTP_M_STRMO);
11912                 if (stcb->asoc.strmout == NULL) {
11913                         uint8_t x;
11914
11915                         stcb->asoc.strmout = oldstream;
11916                         /* Turn off the bit */
11917                         x = add_stream & 0xfe;
11918                         add_stream = x;
11919                         goto skip_stuff;
11920                 }
11921                 /*
11922                  * Ok now we proceed with copying the old out stuff and
11923                  * initializing the new stuff.
11924                  */
11925                 SCTP_TCB_SEND_LOCK(stcb);
11926                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
11927                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11928                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11929                         stcb->asoc.strmout[i].next_sequence_sent = oldstream[i].next_sequence_sent;
11930                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
11931                         stcb->asoc.strmout[i].stream_no = i;
11932                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
11933                         /* now anything on those queues? */
11934                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
11935                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
11936                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
11937                         }
11938                         /* Now move assoc pointers too */
11939                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
11940                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
11941                         }
11942                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
11943                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
11944                         }
11945                 }
11946                 /* now the new streams */
11947                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
11948                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
11949                         stcb->asoc.strmout[i].next_sequence_sent = 0x0;
11950                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
11951                         stcb->asoc.strmout[i].stream_no = i;
11952                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
11953                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
11954                 }
11955                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
11956                 SCTP_FREE(oldstream, SCTP_M_STRMO);
11957                 SCTP_TCB_SEND_UNLOCK(stcb);
11958         }
11959 skip_stuff:
11960         if ((add_stream & 1) && (adding_o > 0)) {
11961                 asoc->strm_pending_add_size = adding_o;
11962                 asoc->peer_req_out = peer_asked;
11963                 sctp_add_an_out_stream(chk, seq, adding_o);
11964                 seq++;
11965                 asoc->stream_reset_outstanding++;
11966         }
11967         if ((add_stream & 2) && (adding_i > 0)) {
11968                 sctp_add_an_in_stream(chk, seq, adding_i);
11969                 seq++;
11970                 asoc->stream_reset_outstanding++;
11971         }
11972         if (send_in_req) {
11973                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
11974                 seq++;
11975                 asoc->stream_reset_outstanding++;
11976         }
11977         if (send_tsn_req) {
11978                 sctp_add_stream_reset_tsn(chk, seq);
11979                 asoc->stream_reset_outstanding++;
11980         }
11981         asoc->str_reset = chk;
11982         /* insert the chunk for sending */
11983         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11984             chk,
11985             sctp_next);
11986         asoc->ctrl_queue_cnt++;
11987         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
11988         return (0);
11989 }
11990
11991 void
11992 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
11993     struct mbuf *cause,
11994     uint8_t use_mflowid, uint32_t mflowid,
11995     uint32_t vrf_id, uint16_t port)
11996 {
11997         /* Don't respond to an ABORT with an ABORT. */
11998         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
11999                 if (cause)
12000                         sctp_m_freem(cause);
12001                 return;
12002         }
12003         sctp_send_resp_msg(m, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12004             use_mflowid, mflowid,
12005             vrf_id, port);
12006         return;
12007 }
12008
12009 void
12010 sctp_send_operr_to(struct mbuf *m, struct sctphdr *sh, uint32_t vtag,
12011     struct mbuf *cause,
12012     uint8_t use_mflowid, uint32_t mflowid,
12013     uint32_t vrf_id, uint16_t port)
12014 {
12015         sctp_send_resp_msg(m, sh, vtag, SCTP_OPERATION_ERROR, cause,
12016             use_mflowid, mflowid,
12017             vrf_id, port);
12018         return;
12019 }
12020
12021 static struct mbuf *
12022 sctp_copy_resume(struct uio *uio,
12023     int max_send_len,
12024     int user_marks_eor,
12025     int *error,
12026     uint32_t * sndout,
12027     struct mbuf **new_tail)
12028 {
12029         struct mbuf *m;
12030
12031         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12032             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12033         if (m == NULL) {
12034                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12035                 *error = ENOMEM;
12036         } else {
12037                 *sndout = m_length(m, NULL);
12038                 *new_tail = m_last(m);
12039         }
12040         return (m);
12041 }
12042
12043 static int
12044 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12045     struct uio *uio,
12046     int resv_upfront)
12047 {
12048         int left;
12049
12050         left = sp->length;
12051         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12052             resv_upfront, 0);
12053         if (sp->data == NULL) {
12054                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12055                 return (ENOMEM);
12056         }
12057         sp->tail_mbuf = m_last(sp->data);
12058         return (0);
12059 }
12060
12061
12062
12063 static struct sctp_stream_queue_pending *
12064 sctp_copy_it_in(struct sctp_tcb *stcb,
12065     struct sctp_association *asoc,
12066     struct sctp_sndrcvinfo *srcv,
12067     struct uio *uio,
12068     struct sctp_nets *net,
12069     int max_send_len,
12070     int user_marks_eor,
12071     int *error)
12072 {
12073         /*-
12074          * This routine must be very careful in its work. Protocol
12075          * processing is up and running so care must be taken to spl...()
12076          * when you need to do something that may effect the stcb/asoc. The
12077          * sb is locked however. When data is copied the protocol processing
12078          * should be enabled since this is a slower operation...
12079          */
12080         struct sctp_stream_queue_pending *sp = NULL;
12081         int resv_in_first;
12082
12083         *error = 0;
12084         /* Now can we send this? */
12085         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12086             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12087             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12088             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12089                 /* got data while shutting down */
12090                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12091                 *error = ECONNRESET;
12092                 goto out_now;
12093         }
12094         sctp_alloc_a_strmoq(stcb, sp);
12095         if (sp == NULL) {
12096                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12097                 *error = ENOMEM;
12098                 goto out_now;
12099         }
12100         sp->act_flags = 0;
12101         sp->sender_all_done = 0;
12102         sp->sinfo_flags = srcv->sinfo_flags;
12103         sp->timetolive = srcv->sinfo_timetolive;
12104         sp->ppid = srcv->sinfo_ppid;
12105         sp->context = srcv->sinfo_context;
12106         sp->strseq = 0;
12107         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12108
12109         sp->stream = srcv->sinfo_stream;
12110         sp->length = min(uio->uio_resid, max_send_len);
12111         if ((sp->length == (uint32_t) uio->uio_resid) &&
12112             ((user_marks_eor == 0) ||
12113             (srcv->sinfo_flags & SCTP_EOF) ||
12114             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12115                 sp->msg_is_complete = 1;
12116         } else {
12117                 sp->msg_is_complete = 0;
12118         }
12119         sp->sender_all_done = 0;
12120         sp->some_taken = 0;
12121         sp->put_last_out = 0;
12122         resv_in_first = sizeof(struct sctp_data_chunk);
12123         sp->data = sp->tail_mbuf = NULL;
12124         if (sp->length == 0) {
12125                 *error = 0;
12126                 goto skip_copy;
12127         }
12128         if (srcv->sinfo_keynumber_valid) {
12129                 sp->auth_keyid = srcv->sinfo_keynumber;
12130         } else {
12131                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12132         }
12133         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12134                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12135                 sp->holds_key_ref = 1;
12136         }
12137         *error = sctp_copy_one(sp, uio, resv_in_first);
12138 skip_copy:
12139         if (*error) {
12140                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12141                 sp = NULL;
12142         } else {
12143                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12144                         sp->net = net;
12145                         atomic_add_int(&sp->net->ref_count, 1);
12146                 } else {
12147                         sp->net = NULL;
12148                 }
12149                 sctp_set_prsctp_policy(sp);
12150         }
12151 out_now:
12152         return (sp);
12153 }
12154
12155
12156 int
12157 sctp_sosend(struct socket *so,
12158     struct sockaddr *addr,
12159     struct uio *uio,
12160     struct mbuf *top,
12161     struct mbuf *control,
12162     int flags,
12163     struct thread *p
12164 )
12165 {
12166         int error, use_sndinfo = 0;
12167         struct sctp_sndrcvinfo sndrcvninfo;
12168         struct sockaddr *addr_to_use;
12169
12170 #if defined(INET) && defined(INET6)
12171         struct sockaddr_in sin;
12172
12173 #endif
12174
12175         if (control) {
12176                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12177                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12178                     sizeof(sndrcvninfo))) {
12179                         /* got one */
12180                         use_sndinfo = 1;
12181                 }
12182         }
12183         addr_to_use = addr;
12184 #if defined(INET) && defined(INET6)
12185         if ((addr) && (addr->sa_family == AF_INET6)) {
12186                 struct sockaddr_in6 *sin6;
12187
12188                 sin6 = (struct sockaddr_in6 *)addr;
12189                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12190                         in6_sin6_2_sin(&sin, sin6);
12191                         addr_to_use = (struct sockaddr *)&sin;
12192                 }
12193         }
12194 #endif
12195         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12196             control,
12197             flags,
12198             use_sndinfo ? &sndrcvninfo : NULL
12199             ,p
12200             );
12201         return (error);
12202 }
12203
12204
12205 int
12206 sctp_lower_sosend(struct socket *so,
12207     struct sockaddr *addr,
12208     struct uio *uio,
12209     struct mbuf *i_pak,
12210     struct mbuf *control,
12211     int flags,
12212     struct sctp_sndrcvinfo *srcv
12213     ,
12214     struct thread *p
12215 )
12216 {
12217         unsigned int sndlen = 0, max_len;
12218         int error, len;
12219         struct mbuf *top = NULL;
12220         int queue_only = 0, queue_only_for_init = 0;
12221         int free_cnt_applied = 0;
12222         int un_sent;
12223         int now_filled = 0;
12224         unsigned int inqueue_bytes = 0;
12225         struct sctp_block_entry be;
12226         struct sctp_inpcb *inp;
12227         struct sctp_tcb *stcb = NULL;
12228         struct timeval now;
12229         struct sctp_nets *net;
12230         struct sctp_association *asoc;
12231         struct sctp_inpcb *t_inp;
12232         int user_marks_eor;
12233         int create_lock_applied = 0;
12234         int nagle_applies = 0;
12235         int some_on_control = 0;
12236         int got_all_of_the_send = 0;
12237         int hold_tcblock = 0;
12238         int non_blocking = 0;
12239         uint32_t local_add_more, local_soresv = 0;
12240         uint16_t port;
12241         uint16_t sinfo_flags;
12242         sctp_assoc_t sinfo_assoc_id;
12243
12244         error = 0;
12245         net = NULL;
12246         stcb = NULL;
12247         asoc = NULL;
12248
12249         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12250         if (inp == NULL) {
12251                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12252                 error = EINVAL;
12253                 if (i_pak) {
12254                         SCTP_RELEASE_PKT(i_pak);
12255                 }
12256                 return (error);
12257         }
12258         if ((uio == NULL) && (i_pak == NULL)) {
12259                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12260                 return (EINVAL);
12261         }
12262         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12263         atomic_add_int(&inp->total_sends, 1);
12264         if (uio) {
12265                 if (uio->uio_resid < 0) {
12266                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12267                         return (EINVAL);
12268                 }
12269                 sndlen = uio->uio_resid;
12270         } else {
12271                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12272                 sndlen = SCTP_HEADER_LEN(i_pak);
12273         }
12274         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12275             addr,
12276             sndlen);
12277         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12278             (inp->sctp_socket->so_qlimit)) {
12279                 /* The listener can NOT send */
12280                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12281                 error = ENOTCONN;
12282                 goto out_unlocked;
12283         }
12284         /**
12285          * Pre-screen address, if one is given the sin-len
12286          * must be set correctly!
12287          */
12288         if (addr) {
12289                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12290
12291                 switch (raddr->sa.sa_family) {
12292 #ifdef INET
12293                 case AF_INET:
12294                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12295                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12296                                 error = EINVAL;
12297                                 goto out_unlocked;
12298                         }
12299                         port = raddr->sin.sin_port;
12300                         break;
12301 #endif
12302 #ifdef INET6
12303                 case AF_INET6:
12304                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12305                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12306                                 error = EINVAL;
12307                                 goto out_unlocked;
12308                         }
12309                         port = raddr->sin6.sin6_port;
12310                         break;
12311 #endif
12312                 default:
12313                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12314                         error = EAFNOSUPPORT;
12315                         goto out_unlocked;
12316                 }
12317         } else
12318                 port = 0;
12319
12320         if (srcv) {
12321                 sinfo_flags = srcv->sinfo_flags;
12322                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12323                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12324                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12325                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12326                         error = EINVAL;
12327                         goto out_unlocked;
12328                 }
12329                 if (srcv->sinfo_flags)
12330                         SCTP_STAT_INCR(sctps_sends_with_flags);
12331         } else {
12332                 sinfo_flags = inp->def_send.sinfo_flags;
12333                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12334         }
12335         if (sinfo_flags & SCTP_SENDALL) {
12336                 /* its a sendall */
12337                 error = sctp_sendall(inp, uio, top, srcv);
12338                 top = NULL;
12339                 goto out_unlocked;
12340         }
12341         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12342                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12343                 error = EINVAL;
12344                 goto out_unlocked;
12345         }
12346         /* now we must find the assoc */
12347         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12348             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12349                 SCTP_INP_RLOCK(inp);
12350                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12351                 if (stcb) {
12352                         SCTP_TCB_LOCK(stcb);
12353                         hold_tcblock = 1;
12354                 }
12355                 SCTP_INP_RUNLOCK(inp);
12356         } else if (sinfo_assoc_id) {
12357                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12358         } else if (addr) {
12359                 /*-
12360                  * Since we did not use findep we must
12361                  * increment it, and if we don't find a tcb
12362                  * decrement it.
12363                  */
12364                 SCTP_INP_WLOCK(inp);
12365                 SCTP_INP_INCR_REF(inp);
12366                 SCTP_INP_WUNLOCK(inp);
12367                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12368                 if (stcb == NULL) {
12369                         SCTP_INP_WLOCK(inp);
12370                         SCTP_INP_DECR_REF(inp);
12371                         SCTP_INP_WUNLOCK(inp);
12372                 } else {
12373                         hold_tcblock = 1;
12374                 }
12375         }
12376         if ((stcb == NULL) && (addr)) {
12377                 /* Possible implicit send? */
12378                 SCTP_ASOC_CREATE_LOCK(inp);
12379                 create_lock_applied = 1;
12380                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12381                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12382                         /* Should I really unlock ? */
12383                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12384                         error = EINVAL;
12385                         goto out_unlocked;
12386
12387                 }
12388                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12389                     (addr->sa_family == AF_INET6)) {
12390                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12391                         error = EINVAL;
12392                         goto out_unlocked;
12393                 }
12394                 SCTP_INP_WLOCK(inp);
12395                 SCTP_INP_INCR_REF(inp);
12396                 SCTP_INP_WUNLOCK(inp);
12397                 /* With the lock applied look again */
12398                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12399                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12400                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12401                 }
12402                 if (stcb == NULL) {
12403                         SCTP_INP_WLOCK(inp);
12404                         SCTP_INP_DECR_REF(inp);
12405                         SCTP_INP_WUNLOCK(inp);
12406                 } else {
12407                         hold_tcblock = 1;
12408                 }
12409                 if (error) {
12410                         goto out_unlocked;
12411                 }
12412                 if (t_inp != inp) {
12413                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12414                         error = ENOTCONN;
12415                         goto out_unlocked;
12416                 }
12417         }
12418         if (stcb == NULL) {
12419                 if (addr == NULL) {
12420                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12421                         error = ENOENT;
12422                         goto out_unlocked;
12423                 } else {
12424                         /* We must go ahead and start the INIT process */
12425                         uint32_t vrf_id;
12426
12427                         if ((sinfo_flags & SCTP_ABORT) ||
12428                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12429                                 /*-
12430                                  * User asks to abort a non-existant assoc,
12431                                  * or EOF a non-existant assoc with no data
12432                                  */
12433                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12434                                 error = ENOENT;
12435                                 goto out_unlocked;
12436                         }
12437                         /* get an asoc/stcb struct */
12438                         vrf_id = inp->def_vrf_id;
12439 #ifdef INVARIANTS
12440                         if (create_lock_applied == 0) {
12441                                 panic("Error, should hold create lock and I don't?");
12442                         }
12443 #endif
12444                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12445                             p
12446                             );
12447                         if (stcb == NULL) {
12448                                 /* Error is setup for us in the call */
12449                                 goto out_unlocked;
12450                         }
12451                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12452                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12453                                 /*
12454                                  * Set the connected flag so we can queue
12455                                  * data
12456                                  */
12457                                 soisconnecting(so);
12458                         }
12459                         hold_tcblock = 1;
12460                         if (create_lock_applied) {
12461                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12462                                 create_lock_applied = 0;
12463                         } else {
12464                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12465                         }
12466                         /*
12467                          * Turn on queue only flag to prevent data from
12468                          * being sent
12469                          */
12470                         queue_only = 1;
12471                         asoc = &stcb->asoc;
12472                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12473                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12474
12475                         /* initialize authentication params for the assoc */
12476                         sctp_initialize_auth_params(inp, stcb);
12477
12478                         if (control) {
12479                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12480                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_7);
12481                                         hold_tcblock = 0;
12482                                         stcb = NULL;
12483                                         goto out_unlocked;
12484                                 }
12485                         }
12486                         /* out with the INIT */
12487                         queue_only_for_init = 1;
12488                         /*-
12489                          * we may want to dig in after this call and adjust the MTU
12490                          * value. It defaulted to 1500 (constant) but the ro
12491                          * structure may now have an update and thus we may need to
12492                          * change it BEFORE we append the message.
12493                          */
12494                 }
12495         } else
12496                 asoc = &stcb->asoc;
12497         if (srcv == NULL)
12498                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12499         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12500                 if (addr)
12501                         net = sctp_findnet(stcb, addr);
12502                 else
12503                         net = NULL;
12504                 if ((net == NULL) ||
12505                     ((port != 0) && (port != stcb->rport))) {
12506                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12507                         error = EINVAL;
12508                         goto out_unlocked;
12509                 }
12510         } else {
12511                 if (stcb->asoc.alternate) {
12512                         net = stcb->asoc.alternate;
12513                 } else {
12514                         net = stcb->asoc.primary_destination;
12515                 }
12516         }
12517         atomic_add_int(&stcb->total_sends, 1);
12518         /* Keep the stcb from being freed under our feet */
12519         atomic_add_int(&asoc->refcnt, 1);
12520         free_cnt_applied = 1;
12521
12522         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12523                 if (sndlen > asoc->smallest_mtu) {
12524                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12525                         error = EMSGSIZE;
12526                         goto out_unlocked;
12527                 }
12528         }
12529         if (SCTP_SO_IS_NBIO(so)
12530             || (flags & MSG_NBIO)
12531             ) {
12532                 non_blocking = 1;
12533         }
12534         /* would we block? */
12535         if (non_blocking) {
12536                 if (hold_tcblock == 0) {
12537                         SCTP_TCB_LOCK(stcb);
12538                         hold_tcblock = 1;
12539                 }
12540                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12541                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12542                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12543                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12544                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12545                                 error = EMSGSIZE;
12546                         else
12547                                 error = EWOULDBLOCK;
12548                         goto out_unlocked;
12549                 }
12550                 stcb->asoc.sb_send_resv += sndlen;
12551                 SCTP_TCB_UNLOCK(stcb);
12552                 hold_tcblock = 0;
12553         } else {
12554                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12555         }
12556         local_soresv = sndlen;
12557         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12558                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12559                 error = ECONNRESET;
12560                 goto out_unlocked;
12561         }
12562         if (create_lock_applied) {
12563                 SCTP_ASOC_CREATE_UNLOCK(inp);
12564                 create_lock_applied = 0;
12565         }
12566         if (asoc->stream_reset_outstanding) {
12567                 /*
12568                  * Can't queue any data while stream reset is underway.
12569                  */
12570                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
12571                 error = EAGAIN;
12572                 goto out_unlocked;
12573         }
12574         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12575             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12576                 queue_only = 1;
12577         }
12578         /* we are now done with all control */
12579         if (control) {
12580                 sctp_m_freem(control);
12581                 control = NULL;
12582         }
12583         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12584             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12585             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12586             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12587                 if (srcv->sinfo_flags & SCTP_ABORT) {
12588                         ;
12589                 } else {
12590                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12591                         error = ECONNRESET;
12592                         goto out_unlocked;
12593                 }
12594         }
12595         /* Ok, we will attempt a msgsnd :> */
12596         if (p) {
12597                 p->td_ru.ru_msgsnd++;
12598         }
12599         /* Are we aborting? */
12600         if (srcv->sinfo_flags & SCTP_ABORT) {
12601                 struct mbuf *mm;
12602                 int tot_demand, tot_out = 0, max_out;
12603
12604                 SCTP_STAT_INCR(sctps_sends_with_abort);
12605                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12606                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12607                         /* It has to be up before we abort */
12608                         /* how big is the user initiated abort? */
12609                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12610                         error = EINVAL;
12611                         goto out;
12612                 }
12613                 if (hold_tcblock) {
12614                         SCTP_TCB_UNLOCK(stcb);
12615                         hold_tcblock = 0;
12616                 }
12617                 if (top) {
12618                         struct mbuf *cntm = NULL;
12619
12620                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAIT, 1, MT_DATA);
12621                         if (sndlen != 0) {
12622                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12623                                         tot_out += SCTP_BUF_LEN(cntm);
12624                                 }
12625                         }
12626                 } else {
12627                         /* Must fit in a MTU */
12628                         tot_out = sndlen;
12629                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12630                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12631                                 /* To big */
12632                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12633                                 error = EMSGSIZE;
12634                                 goto out;
12635                         }
12636                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
12637                 }
12638                 if (mm == NULL) {
12639                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12640                         error = ENOMEM;
12641                         goto out;
12642                 }
12643                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12644                 max_out -= sizeof(struct sctp_abort_msg);
12645                 if (tot_out > max_out) {
12646                         tot_out = max_out;
12647                 }
12648                 if (mm) {
12649                         struct sctp_paramhdr *ph;
12650
12651                         /* now move forward the data pointer */
12652                         ph = mtod(mm, struct sctp_paramhdr *);
12653                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12654                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
12655                         ph++;
12656                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12657                         if (top == NULL) {
12658                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12659                                 if (error) {
12660                                         /*-
12661                                          * Here if we can't get his data we
12662                                          * still abort we just don't get to
12663                                          * send the users note :-0
12664                                          */
12665                                         sctp_m_freem(mm);
12666                                         mm = NULL;
12667                                 }
12668                         } else {
12669                                 if (sndlen != 0) {
12670                                         SCTP_BUF_NEXT(mm) = top;
12671                                 }
12672                         }
12673                 }
12674                 if (hold_tcblock == 0) {
12675                         SCTP_TCB_LOCK(stcb);
12676                 }
12677                 atomic_add_int(&stcb->asoc.refcnt, -1);
12678                 free_cnt_applied = 0;
12679                 /* release this lock, otherwise we hang on ourselves */
12680                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12681                 /* now relock the stcb so everything is sane */
12682                 hold_tcblock = 0;
12683                 stcb = NULL;
12684                 /*
12685                  * In this case top is already chained to mm avoid double
12686                  * free, since we free it below if top != NULL and driver
12687                  * would free it after sending the packet out
12688                  */
12689                 if (sndlen != 0) {
12690                         top = NULL;
12691                 }
12692                 goto out_unlocked;
12693         }
12694         /* Calculate the maximum we can send */
12695         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12696         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12697                 if (non_blocking) {
12698                         /* we already checked for non-blocking above. */
12699                         max_len = sndlen;
12700                 } else {
12701                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12702                 }
12703         } else {
12704                 max_len = 0;
12705         }
12706         if (hold_tcblock) {
12707                 SCTP_TCB_UNLOCK(stcb);
12708                 hold_tcblock = 0;
12709         }
12710         /* Is the stream no. valid? */
12711         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12712                 /* Invalid stream number */
12713                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12714                 error = EINVAL;
12715                 goto out_unlocked;
12716         }
12717         if (asoc->strmout == NULL) {
12718                 /* huh? software error */
12719                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12720                 error = EFAULT;
12721                 goto out_unlocked;
12722         }
12723         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12724         if ((user_marks_eor == 0) &&
12725             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12726                 /* It will NEVER fit */
12727                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12728                 error = EMSGSIZE;
12729                 goto out_unlocked;
12730         }
12731         if ((uio == NULL) && user_marks_eor) {
12732                 /*-
12733                  * We do not support eeor mode for
12734                  * sending with mbuf chains (like sendfile).
12735                  */
12736                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12737                 error = EINVAL;
12738                 goto out_unlocked;
12739         }
12740         if (user_marks_eor) {
12741                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12742         } else {
12743                 /*-
12744                  * For non-eeor the whole message must fit in
12745                  * the socket send buffer.
12746                  */
12747                 local_add_more = sndlen;
12748         }
12749         len = 0;
12750         if (non_blocking) {
12751                 goto skip_preblock;
12752         }
12753         if (((max_len <= local_add_more) &&
12754             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12755             (max_len == 0) ||
12756             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12757                 /* No room right now ! */
12758                 SOCKBUF_LOCK(&so->so_snd);
12759                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12760                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12761                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12762                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12763                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12764                             inqueue_bytes,
12765                             local_add_more,
12766                             stcb->asoc.stream_queue_cnt,
12767                             stcb->asoc.chunks_on_out_queue,
12768                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12769                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12770                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12771                         }
12772                         be.error = 0;
12773                         stcb->block_entry = &be;
12774                         error = sbwait(&so->so_snd);
12775                         stcb->block_entry = NULL;
12776                         if (error || so->so_error || be.error) {
12777                                 if (error == 0) {
12778                                         if (so->so_error)
12779                                                 error = so->so_error;
12780                                         if (be.error) {
12781                                                 error = be.error;
12782                                         }
12783                                 }
12784                                 SOCKBUF_UNLOCK(&so->so_snd);
12785                                 goto out_unlocked;
12786                         }
12787                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12788                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12789                                     asoc, stcb->asoc.total_output_queue_size);
12790                         }
12791                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12792                                 goto out_unlocked;
12793                         }
12794                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12795                 }
12796                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12797                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12798                 } else {
12799                         max_len = 0;
12800                 }
12801                 SOCKBUF_UNLOCK(&so->so_snd);
12802         }
12803 skip_preblock:
12804         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12805                 goto out_unlocked;
12806         }
12807         /*
12808          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
12809          * case NOTE: uio will be null when top/mbuf is passed
12810          */
12811         if (sndlen == 0) {
12812                 if (srcv->sinfo_flags & SCTP_EOF) {
12813                         got_all_of_the_send = 1;
12814                         goto dataless_eof;
12815                 } else {
12816                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12817                         error = EINVAL;
12818                         goto out;
12819                 }
12820         }
12821         if (top == NULL) {
12822                 struct sctp_stream_queue_pending *sp;
12823                 struct sctp_stream_out *strm;
12824                 uint32_t sndout;
12825
12826                 SCTP_TCB_SEND_LOCK(stcb);
12827                 if ((asoc->stream_locked) &&
12828                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
12829                         SCTP_TCB_SEND_UNLOCK(stcb);
12830                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12831                         error = EINVAL;
12832                         goto out;
12833                 }
12834                 SCTP_TCB_SEND_UNLOCK(stcb);
12835
12836                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
12837                 if (strm->last_msg_incomplete == 0) {
12838         do_a_copy_in:
12839                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
12840                         if ((sp == NULL) || (error)) {
12841                                 goto out;
12842                         }
12843                         SCTP_TCB_SEND_LOCK(stcb);
12844                         if (sp->msg_is_complete) {
12845                                 strm->last_msg_incomplete = 0;
12846                                 asoc->stream_locked = 0;
12847                         } else {
12848                                 /*
12849                                  * Just got locked to this guy in case of an
12850                                  * interrupt.
12851                                  */
12852                                 strm->last_msg_incomplete = 1;
12853                                 asoc->stream_locked = 1;
12854                                 asoc->stream_locked_on = srcv->sinfo_stream;
12855                                 sp->sender_all_done = 0;
12856                         }
12857                         sctp_snd_sb_alloc(stcb, sp->length);
12858                         atomic_add_int(&asoc->stream_queue_cnt, 1);
12859                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
12860                                 sp->strseq = strm->next_sequence_sent;
12861                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
12862                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
12863                                             (uintptr_t) stcb, sp->length,
12864                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
12865                                 }
12866                                 strm->next_sequence_sent++;
12867                         } else {
12868                                 SCTP_STAT_INCR(sctps_sends_with_unord);
12869                         }
12870                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
12871                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
12872                         SCTP_TCB_SEND_UNLOCK(stcb);
12873                 } else {
12874                         SCTP_TCB_SEND_LOCK(stcb);
12875                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
12876                         SCTP_TCB_SEND_UNLOCK(stcb);
12877                         if (sp == NULL) {
12878                                 /* ???? Huh ??? last msg is gone */
12879 #ifdef INVARIANTS
12880                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
12881 #else
12882                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
12883                                 strm->last_msg_incomplete = 0;
12884 #endif
12885                                 goto do_a_copy_in;
12886
12887                         }
12888                 }
12889                 while (uio->uio_resid > 0) {
12890                         /* How much room do we have? */
12891                         struct mbuf *new_tail, *mm;
12892
12893                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12894                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
12895                         else
12896                                 max_len = 0;
12897
12898                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
12899                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
12900                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
12901                                 sndout = 0;
12902                                 new_tail = NULL;
12903                                 if (hold_tcblock) {
12904                                         SCTP_TCB_UNLOCK(stcb);
12905                                         hold_tcblock = 0;
12906                                 }
12907                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
12908                                 if ((mm == NULL) || error) {
12909                                         if (mm) {
12910                                                 sctp_m_freem(mm);
12911                                         }
12912                                         goto out;
12913                                 }
12914                                 /* Update the mbuf and count */
12915                                 SCTP_TCB_SEND_LOCK(stcb);
12916                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12917                                         /*
12918                                          * we need to get out. Peer probably
12919                                          * aborted.
12920                                          */
12921                                         sctp_m_freem(mm);
12922                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
12923                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12924                                                 error = ECONNRESET;
12925                                         }
12926                                         SCTP_TCB_SEND_UNLOCK(stcb);
12927                                         goto out;
12928                                 }
12929                                 if (sp->tail_mbuf) {
12930                                         /* tack it to the end */
12931                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
12932                                         sp->tail_mbuf = new_tail;
12933                                 } else {
12934                                         /* A stolen mbuf */
12935                                         sp->data = mm;
12936                                         sp->tail_mbuf = new_tail;
12937                                 }
12938                                 sctp_snd_sb_alloc(stcb, sndout);
12939                                 atomic_add_int(&sp->length, sndout);
12940                                 len += sndout;
12941
12942                                 /* Did we reach EOR? */
12943                                 if ((uio->uio_resid == 0) &&
12944                                     ((user_marks_eor == 0) ||
12945                                     (srcv->sinfo_flags & SCTP_EOF) ||
12946                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12947                                         sp->msg_is_complete = 1;
12948                                 } else {
12949                                         sp->msg_is_complete = 0;
12950                                 }
12951                                 SCTP_TCB_SEND_UNLOCK(stcb);
12952                         }
12953                         if (uio->uio_resid == 0) {
12954                                 /* got it all? */
12955                                 continue;
12956                         }
12957                         /* PR-SCTP? */
12958                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
12959                                 /*
12960                                  * This is ugly but we must assure locking
12961                                  * order
12962                                  */
12963                                 if (hold_tcblock == 0) {
12964                                         SCTP_TCB_LOCK(stcb);
12965                                         hold_tcblock = 1;
12966                                 }
12967                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
12968                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12969                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
12970                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12971                                 else
12972                                         max_len = 0;
12973                                 if (max_len > 0) {
12974                                         continue;
12975                                 }
12976                                 SCTP_TCB_UNLOCK(stcb);
12977                                 hold_tcblock = 0;
12978                         }
12979                         /* wait for space now */
12980                         if (non_blocking) {
12981                                 /* Non-blocking io in place out */
12982                                 goto skip_out_eof;
12983                         }
12984                         /* What about the INIT, send it maybe */
12985                         if (queue_only_for_init) {
12986                                 if (hold_tcblock == 0) {
12987                                         SCTP_TCB_LOCK(stcb);
12988                                         hold_tcblock = 1;
12989                                 }
12990                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12991                                         /* a collision took us forward? */
12992                                         queue_only = 0;
12993                                 } else {
12994                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12995                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12996                                         queue_only = 1;
12997                                 }
12998                         }
12999                         if ((net->flight_size > net->cwnd) &&
13000                             (asoc->sctp_cmt_on_off == 0)) {
13001                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13002                                 queue_only = 1;
13003                         } else if (asoc->ifp_had_enobuf) {
13004                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13005                                 if (net->flight_size > (2 * net->mtu)) {
13006                                         queue_only = 1;
13007                                 }
13008                                 asoc->ifp_had_enobuf = 0;
13009                         }
13010                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13011                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13012                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13013                             (stcb->asoc.total_flight > 0) &&
13014                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13015                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13016
13017                                 /*-
13018                                  * Ok, Nagle is set on and we have data outstanding.
13019                                  * Don't send anything and let SACKs drive out the
13020                                  * data unless wen have a "full" segment to send.
13021                                  */
13022                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13023                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13024                                 }
13025                                 SCTP_STAT_INCR(sctps_naglequeued);
13026                                 nagle_applies = 1;
13027                         } else {
13028                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13029                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13030                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13031                                 }
13032                                 SCTP_STAT_INCR(sctps_naglesent);
13033                                 nagle_applies = 0;
13034                         }
13035                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13036
13037                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13038                                     nagle_applies, un_sent);
13039                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13040                                     stcb->asoc.total_flight,
13041                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13042                         }
13043                         if (queue_only_for_init)
13044                                 queue_only_for_init = 0;
13045                         if ((queue_only == 0) && (nagle_applies == 0)) {
13046                                 /*-
13047                                  * need to start chunk output
13048                                  * before blocking.. note that if
13049                                  * a lock is already applied, then
13050                                  * the input via the net is happening
13051                                  * and I don't need to start output :-D
13052                                  */
13053                                 if (hold_tcblock == 0) {
13054                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13055                                                 hold_tcblock = 1;
13056                                                 sctp_chunk_output(inp,
13057                                                     stcb,
13058                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13059                                         }
13060                                 } else {
13061                                         sctp_chunk_output(inp,
13062                                             stcb,
13063                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13064                                 }
13065                                 if (hold_tcblock == 1) {
13066                                         SCTP_TCB_UNLOCK(stcb);
13067                                         hold_tcblock = 0;
13068                                 }
13069                         }
13070                         SOCKBUF_LOCK(&so->so_snd);
13071                         /*-
13072                          * This is a bit strange, but I think it will
13073                          * work. The total_output_queue_size is locked and
13074                          * protected by the TCB_LOCK, which we just released.
13075                          * There is a race that can occur between releasing it
13076                          * above, and me getting the socket lock, where sacks
13077                          * come in but we have not put the SB_WAIT on the
13078                          * so_snd buffer to get the wakeup. After the LOCK
13079                          * is applied the sack_processing will also need to
13080                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13081                          * once we have the socket buffer lock if we recheck the
13082                          * size we KNOW we will get to sleep safely with the
13083                          * wakeup flag in place.
13084                          */
13085                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13086                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13087                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13088                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13089                                             asoc, uio->uio_resid);
13090                                 }
13091                                 be.error = 0;
13092                                 stcb->block_entry = &be;
13093                                 error = sbwait(&so->so_snd);
13094                                 stcb->block_entry = NULL;
13095
13096                                 if (error || so->so_error || be.error) {
13097                                         if (error == 0) {
13098                                                 if (so->so_error)
13099                                                         error = so->so_error;
13100                                                 if (be.error) {
13101                                                         error = be.error;
13102                                                 }
13103                                         }
13104                                         SOCKBUF_UNLOCK(&so->so_snd);
13105                                         goto out_unlocked;
13106                                 }
13107                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13108                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13109                                             asoc, stcb->asoc.total_output_queue_size);
13110                                 }
13111                         }
13112                         SOCKBUF_UNLOCK(&so->so_snd);
13113                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13114                                 goto out_unlocked;
13115                         }
13116                 }
13117                 SCTP_TCB_SEND_LOCK(stcb);
13118                 if (sp) {
13119                         if (sp->msg_is_complete == 0) {
13120                                 strm->last_msg_incomplete = 1;
13121                                 asoc->stream_locked = 1;
13122                                 asoc->stream_locked_on = srcv->sinfo_stream;
13123                         } else {
13124                                 sp->sender_all_done = 1;
13125                                 strm->last_msg_incomplete = 0;
13126                                 asoc->stream_locked = 0;
13127                         }
13128                 } else {
13129                         SCTP_PRINTF("Huh no sp TSNH?\n");
13130                         strm->last_msg_incomplete = 0;
13131                         asoc->stream_locked = 0;
13132                 }
13133                 SCTP_TCB_SEND_UNLOCK(stcb);
13134                 if (uio->uio_resid == 0) {
13135                         got_all_of_the_send = 1;
13136                 }
13137         } else {
13138                 /* We send in a 0, since we do NOT have any locks */
13139                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13140                 top = NULL;
13141                 if (srcv->sinfo_flags & SCTP_EOF) {
13142                         /*
13143                          * This should only happen for Panda for the mbuf
13144                          * send case, which does NOT yet support EEOR mode.
13145                          * Thus, we can just set this flag to do the proper
13146                          * EOF handling.
13147                          */
13148                         got_all_of_the_send = 1;
13149                 }
13150         }
13151         if (error) {
13152                 goto out;
13153         }
13154 dataless_eof:
13155         /* EOF thing ? */
13156         if ((srcv->sinfo_flags & SCTP_EOF) &&
13157             (got_all_of_the_send == 1)) {
13158                 int cnt;
13159
13160                 SCTP_STAT_INCR(sctps_sends_with_eof);
13161                 error = 0;
13162                 if (hold_tcblock == 0) {
13163                         SCTP_TCB_LOCK(stcb);
13164                         hold_tcblock = 1;
13165                 }
13166                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13167                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13168                     TAILQ_EMPTY(&asoc->sent_queue) &&
13169                     (cnt == 0)) {
13170                         if (asoc->locked_on_sending) {
13171                                 goto abort_anyway;
13172                         }
13173                         /* there is nothing queued to send, so I'm done... */
13174                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13175                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13176                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13177                                 struct sctp_nets *netp;
13178
13179                                 if (stcb->asoc.alternate) {
13180                                         netp = stcb->asoc.alternate;
13181                                 } else {
13182                                         netp = stcb->asoc.primary_destination;
13183                                 }
13184                                 /* only send SHUTDOWN the first time through */
13185                                 sctp_send_shutdown(stcb, netp);
13186                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13187                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13188                                 }
13189                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13190                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13191                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13192                                     netp);
13193                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13194                                     asoc->primary_destination);
13195                         }
13196                 } else {
13197                         /*-
13198                          * we still got (or just got) data to send, so set
13199                          * SHUTDOWN_PENDING
13200                          */
13201                         /*-
13202                          * XXX sockets draft says that SCTP_EOF should be
13203                          * sent with no data.  currently, we will allow user
13204                          * data to be sent first and move to
13205                          * SHUTDOWN-PENDING
13206                          */
13207                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13208                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13209                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13210                                 if (hold_tcblock == 0) {
13211                                         SCTP_TCB_LOCK(stcb);
13212                                         hold_tcblock = 1;
13213                                 }
13214                                 if (asoc->locked_on_sending) {
13215                                         /* Locked to send out the data */
13216                                         struct sctp_stream_queue_pending *sp;
13217
13218                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13219                                         if (sp) {
13220                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13221                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13222                                         }
13223                                 }
13224                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13225                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13226                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13227                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13228                         abort_anyway:
13229                                         if (free_cnt_applied) {
13230                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13231                                                 free_cnt_applied = 0;
13232                                         }
13233                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13234                                             NULL, SCTP_SO_LOCKED);
13235                                         /*
13236                                          * now relock the stcb so everything
13237                                          * is sane
13238                                          */
13239                                         hold_tcblock = 0;
13240                                         stcb = NULL;
13241                                         goto out;
13242                                 }
13243                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13244                                     asoc->primary_destination);
13245                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13246                         }
13247                 }
13248         }
13249 skip_out_eof:
13250         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13251                 some_on_control = 1;
13252         }
13253         if (queue_only_for_init) {
13254                 if (hold_tcblock == 0) {
13255                         SCTP_TCB_LOCK(stcb);
13256                         hold_tcblock = 1;
13257                 }
13258                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13259                         /* a collision took us forward? */
13260                         queue_only = 0;
13261                 } else {
13262                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13263                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13264                         queue_only = 1;
13265                 }
13266         }
13267         if ((net->flight_size > net->cwnd) &&
13268             (stcb->asoc.sctp_cmt_on_off == 0)) {
13269                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13270                 queue_only = 1;
13271         } else if (asoc->ifp_had_enobuf) {
13272                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13273                 if (net->flight_size > (2 * net->mtu)) {
13274                         queue_only = 1;
13275                 }
13276                 asoc->ifp_had_enobuf = 0;
13277         }
13278         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13279             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13280         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13281             (stcb->asoc.total_flight > 0) &&
13282             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13283             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13284                 /*-
13285                  * Ok, Nagle is set on and we have data outstanding.
13286                  * Don't send anything and let SACKs drive out the
13287                  * data unless wen have a "full" segment to send.
13288                  */
13289                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13290                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13291                 }
13292                 SCTP_STAT_INCR(sctps_naglequeued);
13293                 nagle_applies = 1;
13294         } else {
13295                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13296                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13297                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13298                 }
13299                 SCTP_STAT_INCR(sctps_naglesent);
13300                 nagle_applies = 0;
13301         }
13302         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13303                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13304                     nagle_applies, un_sent);
13305                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13306                     stcb->asoc.total_flight,
13307                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13308         }
13309         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13310                 /* we can attempt to send too. */
13311                 if (hold_tcblock == 0) {
13312                         /*
13313                          * If there is activity recv'ing sacks no need to
13314                          * send
13315                          */
13316                         if (SCTP_TCB_TRYLOCK(stcb)) {
13317                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13318                                 hold_tcblock = 1;
13319                         }
13320                 } else {
13321                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13322                 }
13323         } else if ((queue_only == 0) &&
13324                     (stcb->asoc.peers_rwnd == 0) &&
13325             (stcb->asoc.total_flight == 0)) {
13326                 /* We get to have a probe outstanding */
13327                 if (hold_tcblock == 0) {
13328                         hold_tcblock = 1;
13329                         SCTP_TCB_LOCK(stcb);
13330                 }
13331                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13332         } else if (some_on_control) {
13333                 int num_out, reason, frag_point;
13334
13335                 /* Here we do control only */
13336                 if (hold_tcblock == 0) {
13337                         hold_tcblock = 1;
13338                         SCTP_TCB_LOCK(stcb);
13339                 }
13340                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13341                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13342                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13343         }
13344         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13345             queue_only, stcb->asoc.peers_rwnd, un_sent,
13346             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13347             stcb->asoc.total_output_queue_size, error);
13348
13349 out:
13350 out_unlocked:
13351
13352         if (local_soresv && stcb) {
13353                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13354         }
13355         if (create_lock_applied) {
13356                 SCTP_ASOC_CREATE_UNLOCK(inp);
13357         }
13358         if ((stcb) && hold_tcblock) {
13359                 SCTP_TCB_UNLOCK(stcb);
13360         }
13361         if (stcb && free_cnt_applied) {
13362                 atomic_add_int(&stcb->asoc.refcnt, -1);
13363         }
13364 #ifdef INVARIANTS
13365         if (stcb) {
13366                 if (mtx_owned(&stcb->tcb_mtx)) {
13367                         panic("Leaving with tcb mtx owned?");
13368                 }
13369                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13370                         panic("Leaving with tcb send mtx owned?");
13371                 }
13372         }
13373 #endif
13374 #ifdef INVARIANTS
13375         if (inp) {
13376                 sctp_validate_no_locks(inp);
13377         } else {
13378                 SCTP_PRINTF("Warning - inp is NULL so cant validate locks\n");
13379         }
13380 #endif
13381         if (top) {
13382                 sctp_m_freem(top);
13383         }
13384         if (control) {
13385                 sctp_m_freem(control);
13386         }
13387         return (error);
13388 }
13389
13390
13391 /*
13392  * generate an AUTHentication chunk, if required
13393  */
13394 struct mbuf *
13395 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13396     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13397     struct sctp_tcb *stcb, uint8_t chunk)
13398 {
13399         struct mbuf *m_auth;
13400         struct sctp_auth_chunk *auth;
13401         int chunk_len;
13402         struct mbuf *cn;
13403
13404         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13405             (stcb == NULL))
13406                 return (m);
13407
13408         /* sysctl disabled auth? */
13409         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
13410                 return (m);
13411
13412         /* peer doesn't do auth... */
13413         if (!stcb->asoc.peer_supports_auth) {
13414                 return (m);
13415         }
13416         /* does the requested chunk require auth? */
13417         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13418                 return (m);
13419         }
13420         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
13421         if (m_auth == NULL) {
13422                 /* no mbuf's */
13423                 return (m);
13424         }
13425         /* reserve some space if this will be the first mbuf */
13426         if (m == NULL)
13427                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13428         /* fill in the AUTH chunk details */
13429         auth = mtod(m_auth, struct sctp_auth_chunk *);
13430         bzero(auth, sizeof(*auth));
13431         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13432         auth->ch.chunk_flags = 0;
13433         chunk_len = sizeof(*auth) +
13434             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13435         auth->ch.chunk_length = htons(chunk_len);
13436         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13437         /* key id and hmac digest will be computed and filled in upon send */
13438
13439         /* save the offset where the auth was inserted into the chain */
13440         *offset = 0;
13441         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13442                 *offset += SCTP_BUF_LEN(cn);
13443         }
13444
13445         /* update length and return pointer to the auth chunk */
13446         SCTP_BUF_LEN(m_auth) = chunk_len;
13447         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13448         if (auth_ret != NULL)
13449                 *auth_ret = auth;
13450
13451         return (m);
13452 }
13453
13454 #ifdef INET6
13455 int
13456 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13457 {
13458         struct nd_prefix *pfx = NULL;
13459         struct nd_pfxrouter *pfxrtr = NULL;
13460         struct sockaddr_in6 gw6;
13461
13462         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13463                 return (0);
13464
13465         /* get prefix entry of address */
13466         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13467                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13468                         continue;
13469                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13470                     &src6->sin6_addr, &pfx->ndpr_mask))
13471                         break;
13472         }
13473         /* no prefix entry in the prefix list */
13474         if (pfx == NULL) {
13475                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13476                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13477                 return (0);
13478         }
13479         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13480         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13481
13482         /* search installed gateway from prefix entry */
13483         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13484                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13485                 gw6.sin6_family = AF_INET6;
13486                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13487                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13488                     sizeof(struct in6_addr));
13489                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13490                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13491                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13492                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13493                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13494                     ro->ro_rt->rt_gateway)) {
13495                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13496                         return (1);
13497                 }
13498         }
13499         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13500         return (0);
13501 }
13502
13503 #endif
13504
13505 int
13506 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13507 {
13508 #ifdef INET
13509         struct sockaddr_in *sin, *mask;
13510         struct ifaddr *ifa;
13511         struct in_addr srcnetaddr, gwnetaddr;
13512
13513         if (ro == NULL || ro->ro_rt == NULL ||
13514             sifa->address.sa.sa_family != AF_INET) {
13515                 return (0);
13516         }
13517         ifa = (struct ifaddr *)sifa->ifa;
13518         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13519         sin = (struct sockaddr_in *)&sifa->address.sin;
13520         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13521         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13522         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13523         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13524
13525         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13526         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13527         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13528         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13529         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13530         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13531                 return (1);
13532         }
13533 #endif
13534         return (0);
13535 }